r-410a single-package rooftop electric cooling unit installation … · 2020. 7. 30. · fig. 3 —...

513 01 3611 02 12/13/2018

Installation InstructionsCONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . 2

MODEL NUMBER NOMENCLATUREAND DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . . 8• ROOF MOUNT

Step 2 — Plan for Sequence of UnitInstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9• CURB-MOUNTED INSTALLATION• PAD-MOUNTED INSTALLATION• FRAME-MOUNTED INSTALLATION

Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 9• ROOF CURB MOUNT• SLAB MOUNT (HORIZONTAL UNITS ONLY)• ALTERNATE UNIT SUPPORT

Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . . 11• UNITS WITH ACCESSORY ELECTRIC HEATERS

Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 11• POSITIONING ON CURB

Step 7 — Convert to Horizontal and ConnectDuctwork (When Required) . . . . . . . . . . . . . . . . . . . . . 12

Step 8 — Install Optional Outside Air Hood . . . . . . . 13• ECONOMIZER AND TWO-POSITION DAMPER

HOOD PACKAGE REMOVAL AND SETUP• ECONOMIZER HOOD AND TWO-POSITION HOOD

Step 9 — Install External CondensateTrap and Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Page

Step 10 — Make Electrical Connections . . . . . . . . . . 15• FIELD POWER SUPPLY• UNITS WITH FACTORY-INSTALLED NON-FUSED

DISCONNECT• UNITS WITHOUT FACTORY-INSTALLED

DISCONNECT• ALL UNITS• CONVENIENCE OUTLETS• FACTORY-OPTION THRU-BASE CONNECTIONS• UNITS WITHOUT THRU-BASE CONNECTIONS• FIELD CONTROL WIRING• THERMOSTAT

Electric Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19• SINGLE POINT BOXES AND SUPPLEMENTARY

FUSES• SINGLE POINT BOXES WITHOUT FUSES• LOW-VOLTAGE CONTROL CONNECTIONSHot Gas Re-Heat Control Connections. . . . . . . . . . . . 21• HOT GAS RE-HEAT — SPACE RH CONTROLLER

2-Speed Indoor Fan Motor System with VFD . . . . . . 23

Economi$er® X (Factory Option) . . . . . . . . . . . . . . . . . 23• SYSTEM COMPONENTS• SEQUENCE OF OPERATION• ENTHALPY SETTINGS• TWO-SPEED FAN OPERATION• CHECKOUT• TROUBLESHOOTING

Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Step 11 — Adjust Factory-Installed Options. . . . . . . 37• SMOKE DETECTOR• ECONOMIZER OCCUPANCY SWITCH

Step 12 — Install Accessories, As Required . . . . . . 37

Step 13 — Check Belt Tension . . . . . . . . . . . . . . . . . . 38

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . CL-1

RAH072-120R-410A Single-Package Rooftop

Electric Cooling Unit

2 Specifications subject to change without notice. 513 01 3611 02

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personal injuryor property damage. Consult a qualified installer, serviceagency, or your distributor or branch for information orassistance. The qualified installer or agency must usefactory-authorized kits or accessories when modifying thisproduct. Refer to the individual instructions packaged withthe kits or accessories when installing.Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached tothe unit. Consult local building codes and appropriatenational electrical codes (in USA, ANSI/NFPA70, NationalElectrical Code (NEC); in Canada, CSA C22.1) for specialrequirements.It is important to recognize safety information. This is thesafety-alert symbol . When you see this symbol on theunit and in instructions or manuals, be alert to the potentialfor personal injury.Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety-alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury or death.WARNING signifies hazards which could result in personalinjury or death. CAUTION is used to identify unsafepractices, which may result in minor personal injury orproduct and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation,reliability, or operation.

MODEL NUMBER NOMENCLATURE AND DIMENSIONS

See Fig. 1 for RAH model number nomenclature. See Fig. 2for unit dimensional drawings.

Rated Indoor AirflowTable 1 lists the rated indoor airflow used for the AHRIefficiency rating for the units covered in this document.

Table 1 — Rated Indoor Airflow

WARNINGElectrical shock can cause personal injury and death.Shut off all power to this equipment during installationand service. There may be more than one disconnectswitch. Tag all disconnect locations to alert others not torestore power until work is completed.

WARNINGFailure to follow this warning could cause personal injury,death and/or equipment damage.R-410A refrigerant systems operate at higher pressuresthan standard R-22 systems. Do not use R-22 serviceequipment or components on R-410A refrigerant equip-ment.

WARNINGFailure to follow this warning could cause personal injuryor death.Relieve pressure and recover all refrigerant before sys-tem repair or final unit disposal. Wear safety glasses andgloves when handling refrigerants. Keep torches andother ignition sources away from refrigerants and oils.

CAUTIONFailure to follow this caution may result in personal injury.Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicing airconditioning equipment.

MODEL NUMBER RATED INDOOR AIRFLOW (CFM)RAH072 2400RAH073 2400RAH090 3000RAH102 3000RAH110 3000RAH120 3000

513 01 3611 02 Specifications subject to change without notice. 3

Fig. 1 — Model Number Nomenclature

MODEL SERIES R A H 0 9 0 H 0 A A 0 A A TPosition Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14

R = Rooftop

A = Air Conditioning (Cooling Only) Type

H = High Efficiency Efficiency

072 = 72,000 = 6 tons (One Compressor)

073 = 73,000 = 6 tons (One Compressor)

090 = 90,000 = 7.5 tons (Two Compressors)

102 = 102,000 = 8.5 tons (Two Compressors)

110 = 110,000 = 10 tons (Two Compressors) 12 EER

120 = 120,000 = 10 tons (Two Compressors) 11.7 EER Nominal Cooling Capacity

H= 208/230--3--60

L = 460--3--60

S = 575--3--60 Voltage

0 = No Heat Heating Capacity *

A = Standard Static Motor

B = High Static Motor

C = Medium Static Motor Motor Options

A = None

B = Economizer w/ Barometric Relief, OA Temp Sensor

E = Economizer w/ Barometric Relief + CO2 Sensor, OA Temp Sensor

H = Economizer w/ Barometric Relief, Enthalpy Sensor

L = Economizer w/ Barometric Relief + CO2 Sensor, Enthalpy Sensor

P = 2--Position Damper w/ Barometric Relief

U = Temperature Ultra Low Leak Economizer w/ Barometric Relief

W = Enthalpy Ultra Low Leak Economizer w/ Barometric Relief Outdoor Air Options / Control

0A = No Options Factory--Installed Options*

A = Aluminum / Copper Condenser and Evaporator Coils

B = Pre--Coat Aluminum / Copper Condenser and Aluminum / Copper Evaporator Coils

C = E--Coat Aluminum / Copper Condenser and Aluminum / Copper Evaporator Coils

D = E--Coat Aluminum / Copper Condenser and E--Coat Aluminum / Copper Evaporator Coils

E = Copper / Copper Condenser and Aluminum / Copper Evaporator Coils

F = Copper / Copper Condenser and Copper / Copper Evaporator Coils Condenser / Evaporator Coil Configuration

T = Two Speed Indoor Motor Controller (VFD) -- Standard on U.S. models

A = Single Speed Indoor Fan Motor, for W7212 controls

B = Single Speed Indoor Fan Motor, for W7220 controls Indoor Fan Motor Speed

* See RAH 3 to 12.5 ton Product Specification for details.


Fig. 2 — RAH072-102 Unit Dimensional Drawing


Fig. 2 — RAH072-102 Unit Dimensional Drawing (cont)


Fig. 3 — RAH110-120 Unit Dimensional Drawing


Fig. 3 — RAH110-120 Unit Dimensional Drawing (cont)


Fig. 4 — Service Clearance Dimensional Drawing

INSTALLATION

Jobsite SurveyComplete the following checks before installation.1. Consult local building codes and the NEC (National

Electrical Code) ANSI/NFPA 70 for special installa-tion requirements.

2. Determine unit location (from project plans) or selectunit location.

3. Check for possible overhead obstructions which mayinterfere with unit lifting or rigging.

Step 1 — Plan for Unit LocationSelect a location for the unit and its support system (curb orother) that provides for the minimum clearances required forsafety. This includes the clearance to combustible surfaces,unit performance and service access below, around andabove unit as specified in unit drawings. See Fig. 4.

NOTE: Consider also the effect of adjacent units.Unit may be installed directly on wood flooring or on ClassA, B, or C roof-covering material when roof curb is used.Do not install unit in an indoor location. Do not locate air in-lets near exhaust vents or other sources of contaminatedair.Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall onto theunit.Select a unit mounting system that provides adequateheight to allow installation of condensate trap per require-ments. Refer to “Step 9 — Install External Condensate Trapand Line” on page 14 for required trap dimensions.

ROOF MOUNT

Check building codes for weight distribution requirements.Unit operating weight is shown in Table 4.

C

BA

D

NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruction or for vertical clearances.

LOCATION CONDITION DIMENSION

A

Unit disconnect is mounted on panel 48 in. (1219 mm)No disconnect, convenience outlet option 18 in. (457 mm)Recommended service clearance 18 in. (457) mmMinimum clearance 12 in. (305 mm)

BSurface behind servicer is grounded (e.g., metal, masonry wall) 42 in. (1067 mm)Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass) 36 in. (914 mm)Check for sources of flue products within 10 ft of unit fresh air intake hood Special

CSide condensate drain is used 36 in. (914 mm)Minimum clearance 18 in. (457 mm)

DSurface behind servicer is grounded (e.g., metal, masonry wall, another unit) 42 in. (1067 mm)Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass) 36 in. (914 mm)


Step 2 — Plan for Sequence of Unit InstallationThe support method used for this unit will dictate differentsequences for the steps of unit installation. For example, oncurb-mounted units, some accessories must be installed onthe unit before the unit is placed on the curb. Review the fol-lowing for recommended sequences for installation steps.

CURB-MOUNTED INSTALLATION

1. Install roof curb2. Install field-fabricated ductwork inside curb3. Install accessory thru-base service connection pack-

age, if used, (affects curb and unit) (refer to acces-sory installation instructions for details)

4. Prepare bottom condensate drain connection to suitplanned condensate line routing (refer to Step 9 fordetails)

5. Rig and place unit6. Install outdoor air hood7. Install condensate line trap and piping8. Make electrical connections9. Install other accessories

PAD-MOUNTED INSTALLATION

1. Prepare pad and unit supports2. Check and tighten the bottom condensate drain con-

nection plug3. Rig and place unit4. Install outdoor air hood5. Convert unit to side duct connection arrangement6. Install field-fabricated ductwork at unit duct openings7. Install outdoor air hood8. Install condensate line trap and piping9. Make electrical connections10. Install other accessories

FRAME-MOUNTED INSTALLATION

Frame-mounted applications generally follow the sequencefor a curb installation. Adapt as required to suit specific in-stallation plan.

Step 3 — Inspect UnitInspect unit for transportation damage. File any claim withtransportation agency.Confirm before installation of unit that voltage, amperageand circuit protection requirements listed on unit data plateagree with power supply provided.

On units with hinged panel option, check to be sure all latch-es are snug and in closed position.Locate the carton containing the outside air hood parts; seeFig. 12 on page 13. Do not remove carton until unit hasbeen rigged and located in final position.

Step 4 — Provide Unit Support

ROOF CURB MOUNT

Accessory roof curb details and dimensions are shown inFig. 5. Assemble and install accessory roof curb in accor-dance with instructions shipped with the curb.NOTE: The gasketing of the unit to the roof curb is criticalfor a watertight seal. Install gasket supplied with the roofcurb as shown in Fig. 5. Improperly applied gasket can alsoresult in air leaks and poor unit performance.Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are shown inFig. 6. Refer to Accessory Roof Curb Installation Instruc-tions for additional information as required.Install insulation, cant strips, roofing felt, and counter flash-ing as shown. Ductwork must be attached to curb and notto the unit. The accessory thru-the-base power and gasconnection package must be installed before the unit is seton the roof curb.If electric and control wiring is to be routed through thebasepan, attach the accessory thru-the-base service con-nections to the basepan in accordance with the accessoryinstallation instructions.

SLAB MOUNT (HORIZONTAL UNITS ONLY)

Provide a level concrete slab that extends a minimum of6 in. (150 mm) beyond unit cabinet. Install a gravel apron infront of condenser coil air inlet to prevent grass and foliagefrom obstructing airflow.NOTE: Horizontal units may be installed on a roof curb if re-quired.

ALTERNATE UNIT SUPPORT (IN LIEU OF CURB ORSLAB MOUNT)

A non-combustible sleeper rail can be used in the unit curbsupport area. If sleeper rails cannot be used, support thelong sides of the unit with a minimum of 3 equally spaced4-in. x 4-in. (102 mm x 102 mm) pads on each side.

Table 2 — Operating Weights

*Not available for size 110 units.

COMPONENTRAH UNITS LB (KG)

072/073 090 102 110/120Base Unit 715 (324) 860 (390) 860 (390) 1025 (466)Economizer

Vertical 75 (34) 75 (34) 75 (34) 75 (34)Horizontal 122 (55) 122 (55) 122 (55) 122 (55)

Hot Gas Re-Heat System* 80 (36) 80 (36) 80 (36) 85 (39)Cu Fins 25 (11) 43 (20) 56 (25) 73 (33)Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16)Curb

14-in./356mm 143 (65) 143 (65) 143 (65) 143 (65)24-in./610mm 245 (111) 245 (111) 245 (111) 245 (111)


Fig. 5 — Roof Curb Details

7/16

"[1

1]

4 9/

16"

[115

.5]

1/4"

[7.0

]

"A"

1 3/

4"[4

4.5]

1 3/

4"[4

4.4]

20-3

/4"

[513

]IN

SID

E

"A"

81 3

/4"

[207

6.3]

53 1

/2"

[135

8.9]

1 3/

4"[4

4.5]

40 3

/16"

[102

0.8]

2 1/

4"[5

7.2]

26"

[660

.4]

4 3/

16"

[106

.0]

6 3/

64"

[153

.5]

32 9

/16"

[827

.1]

23 1

/16"

[585

.8]

31 1

7/32

"[8

00.9

]1

3/4"

[44.

5]

15 1

3/16

"[4

01.6

]

11.4

2"[2

90.0

]

1 3/

4"[4

4.4]

3"[7

6.2]

2-3/

8"[6

1]

14 3

/4"

[374

.7]

6' 6

-1/4

"[1

987.

5]

1-3

/4"

TYP

[44.

5]

4' 2

"[1

270.

0]

15 1

5/32

[392

.9]

1.00

"[2

5.4]

CR

BTM

PWR

002A

013/

4" [1

9] N

PT1

1/4"

[31.

7] N

PTC

RR

FCU

RB0

04A0

1

CO

NN

ECTO

R P

KG. A

CC

.G

AS C

ON

NEC

TIO

N T

YPE

GAS

FIT

TIN

GPO

WER

WIR

ING

FI

TTIN

GC

ON

TRO

L W

IRIN

G

FITT

ING

ACC

ESSO

RY

CO

NVE

NIE

NC

E O

UTL

ET W

IRIN

G C

ON

NEC

TOR

THR

U T

HE

CU

RB

1/2"

[12.

7] N

PT1/

2" [1

2.7]

NPT

CR

BTM

PWR

004A

01TH

RU

TH

E BO

TTO

M

RO

OF

CU

RB

ACC

ESSO

RY

#A

CR

RFC

UR

B003

A01

14"

[356

]

24"

[610

]

ECN

NO

.AP

P'D

CH

K'D

BYD

ATE

REV

ISIO

N R

ECO

RD

REV

1067

898

--

MM

C4/

22/1

36'

61/

4" W

AS 6

' 7 1

/6",

4'2'

WAS

4' 2

13/

16";

18 G

A W

AS 1

6 G

A.; 1

5 13

/16"

WAS

15

15/1

6"; N

AIL

FIEL

D S

UPP

LIED

WAS

WIT

H C

UR

BC

DR

AWIN

G R

ELEA

SE L

EVEL

:PR

OD

UC

TIO

NTH

IRD

AN

GLE

PRO

JEC

TIO

N

UN

LESS

OTH

ERW

ISE

SPEC

IFIE

DD

IMEN

SIO

NS

ARE

IN IN

CH

ESTO

LER

ANC

ES O

N:

THIS

DO

CU

MEN

T AN

D T

HE

INFO

RM

ATIO

N C

ON

TAIN

ED T

HER

EIN

IS P

RO

PRIE

TAR

Y TO

CAR

RIE

R C

OR

POR

ATIO

N A

ND

SH

ALL

NO

TBE

USE

D O

R D

ISC

LOSE

D T

O O

THER

S, IN

WH

OLE

OR

IN P

ART,

WIT

HO

UT

THE

WR

ITTE

N A

UTH

OR

IZAT

ION

OF

CAR

RIE

R C

OR

POR

ATIO

N.

1 D

EC2

DEC

3 D

ECAN

GM

ATER

IAL

--

--

- - -

AUTH

OR

IZAT

ION

NU

MBE

RTI

TLE

1029

120

CU

RB

ASY,

RO

OF

ENG

INEE

RIN

GM

ANU

FAC

TUR

ING

ENG

INEE

RIN

G R

EQU

IREM

ENTS

--

--

SIZE

DR

AWIN

G N

UM

BER

REV

T-00

5, Y

-002

DR

AFTE

RC

HEC

KER

D50

HJ4

0501

2C

WEI

GH

T:-

MM

C12

/16/

09-

-SH

EET

5 O

F 5

SUR

FAC

E FI

NIS

HM

FG/P

UR

CH

MO

DEL

(IN

TER

NAL

USE

ON

LY)

NEX

T D

RAW

ING

SCAL

ED

ISTR

IBU

TIO

N

-PU

RC

H-

N/A

-

NO

TES:

1. R

OO

FCU

RB

ACC

ESSO

RY

IS S

HIP

PED

DIS

ASSE

MBL

ED.

2. IN

SULA

TED

PAN

ELS:

25.

4 [1

"] TH

K. P

OLY

UR

ETH

ANE

FOAM

, 44.

5 [1

-3/4

] # D

ENSI

TY.

3. D

IMEN

SIO

NS

IN [

] AR

E IN

MIL

LIM

ETER

S.4.

RO

OFC

UR

B: 1

8 G

AGE

STEE

L.5.

ATT

ACH

DU

CTW

OR

K TO

CU

RB.

(FLA

NG

ES O

F D

UC

T R

EST

ON

CU

RB)

.6.

SER

VIC

E C

LEAR

ANC

E 4

FEET

ON

EAC

H S

IDE.

7.

DIR

ECTI

ON

OF

AIR

FLO

W.

8. C

ON

NEC

TOR

PAC

KAG

E C

RBT

MPW

R00

2A01

IS F

OR

TH

RU

-TH

E-C

UR

B G

AS T

YPE

PA

CKA

GE

CR

BTM

PWR

004A

01 IS

FO

R T

HR

U-T

HE-

BOTT

OM

TYP

E G

AS C

ON

NEC

TIO

NS.

TYPI

CAL

(4) S

IDES

SUPP

LY A

IRR

ETU

RN

AIR

RO

OFI

NG

MAT

ERIA

L(F

IELD

SU

PPLI

ED)

CAN

T ST

RIP

(FIE

LD S

UPP

LIED

)

RO

OFI

NG

FEL

T(F

IELD

SU

PPLI

ED)

CO

UN

TER

FLA

SHIN

G(F

IELD

SU

PPLI

ED)

UN

ITG

ASKE

T(S

UPP

LIED

WIT

H C

UR

B)

RIG

ID IN

SULA

TIO

N(F

IELD

SU

PPLI

ED)

DU

CT

(FIE

LD S

UPP

LIED

)

NAI

L (F

IELD

SU

PPLI

ED)

CER

TIFI

ED D

RAW

ING

VIEW

"B"

CO

RN

ER D

ETAI

L

SEC

TIO

N T

HR

U S

IDE

SE

E V

IEW

"B

"

GAS

SER

VIC

E PL

ATE

THR

U T

HE

CU

RB

DR

ILL

HO

LE

2" [5

0.8]

@

ASSE

MBL

Y (IF

R

EQU

IRED

) (S

EE N

OTE

#8)

SEE

NO

TE #

2

12-1

/2" [

317.

5] W

IDE

INSU

LATE

D D

ECK

PAN

ELS

9-15

/16"

[252

.4] W

IDE

INSU

LATE

D D

ECK

PAN

EL

SUPP

LY A

IRR

ETU

RN

AIR

SUPP

LY A

IRO

PEN

ING

RET

UR

N A

IRO

PEN

ING


Fig. 6 — Unit Leveling Tolerances

Step 5 — Field Fabricate DuctworkCabinet return-air static pressure (a negative condition)shall not exceed 0.35 in. wg (87 Pa) with economizer or0.45 in. wg (112 Pa) without economizer.For vertical ducted applications, secure all ducts to roof curband building structure. Do not connect ductwork to unit.Fabricate supply ductwork so that the cross sectional di-mensions are equal to or greater than the unit supply ductopening dimensions for the first 18 in. (458 mm) of ductlength from the unit basepan.Insulate and weatherproof all external ductwork, joints, androof openings with counter flashing and mastic in accor-dance with applicable codes.Ducts passing through unconditioned spaces must be insu-lated and covered with a vapor barrier.If a plenum return is used on a vertical unit, the returnshould be ducted through the roof deck to comply with ap-plicable fire codes.

UNITS WITH ACCESSORY ELECTRIC HEATERS

Horizontal applications require a minimum clearance tocombustible surfaces of 1-in. (25 mm) from duct for first12-in (305 mm) away from unit. Vertical applications do notrequire a minimum clearance.Minimum clearance is not required around ductwork.Outlet grilles must not lie directly below unit discharge.NOTE: A 90-degree elbow must be provided in theductwork to comply with UL (Underwriters Laboratories)code for use with electric heat.

Step 6 — Rig and Place UnitKeep unit upright and do not drop. Spreader bars are not re-quired if top crating is left on unit. Rollers may be used to move unit across a roof. Level byusing unit frame as a reference. See Fig. 7 for additional in-formation.Lifting holes are provided in base rails as shown in Fig. 7.Refer to rigging instructions on unit.Rigging materials under unit (cardboard to prevent basepan damage) must be removed PRIOR to placing the uniton the roof curb.When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Do thisbefore setting the unit in place. The red drain pan plug canbe tightened with a 1/2-in. square socket drive extension.For further details see Step 9 — Install External CondensateTrap and Line on page 14.Before setting the unit onto the curb, recheck gasketing oncurb.

CAUTIONPROPERTY DAMAGE HAZARDFailure to follow this caution may result in damage toroofing materials.Membrane roofs can be cut by sharp sheet metaledges. Be careful when placing any sheet metal partson such roof.

A

B

C

MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)

A-B B-C A-C0.5 (13) 1.0 (25) 1.0 (25)

WARNINGPERSONAL INJURY HAZARDFailure to follow this warning could cause personalinjury.For vertical supply and return units, tools or partscould drop into ductwork and cause an injury. Install a90-degree turn in the return ductwork between theunit and the conditioned space. If a 90-degree elbowcannot be installed, then a grille of sufficient strengthand density should be installed to prevent objectsfrom falling into the conditioned space. Due to electricheater, supply duct will require 90-degree elbow.

CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage.All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.If using top crate as spreader bar, once unit is set,carefully lower wooden crate off building roof top toground. Ensure that no people or obstructions are be-low prior to lowering the crate.


Fig. 7 — Rigging Details

POSITIONING ON CURB

Position unit on roof curb so that the following clearancesare maintained: 1/4 in. (6.4 mm) clearance between the roofcurb and the base rail inside the front and rear, 0.0 in. clear-ance between the roof curb and the base rail inside on theduct end of the unit. This will result in the distance betweenthe roof curb and the base rail inside on the condenser endof the unit being approximately 1/4 in. (6.4 mm).Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.

After unit is in position, remove rigging skids and shippingmaterials.

Step 7 — Convert to Horizontal and ConnectDuctwork (When Required)Unit is shipped in the vertical duct configuration. Unit withoutfactory-installed economizer or return-air smoke detectoroption may be field-converted to horizontal ducted configu-ration. To convert to horizontal configuration, removescrews from side duct opening covers (see Fig. 8) and re-move covers. Use the screws to install the covers on verti-cal duct openings with the insulation-side down. The panelsmust be inserted into the notches on the basepan to proper-ly seal. The notches are covered by the tape used to securethe insulation to the basepan and are not easily seen. SeeFig. 9 for position of the notches in the basepan. Sealsaround duct openings must be tight. Secure with screws asshown in Fig. 10. Cover seams with foil duct tape.Field-supplied flanges should be attached to horizontal ductopenings and all ductwork should be secured to the flanges.Insulate and weatherproof all external ductwork, joints, and

roof or building openings with counter flashing and mastic inaccordance with applicable codes.Do not cover or obscure visibility to the unit’s informativedata plate when insulating horizontal ductwork.

Fig. 8 — Horizontal Conversion Panels

Fig. 9 — Location of Notches

NOTES:1. Dimensions in ( ) are in millimeters.2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the unit center of gravity.

Use wooden top to prevent rigging straps from damaging unit.

UNIT MAX WEIGHT LB (KG)DIMENSIONS IN. (MM)

A B CRAH072/073 1130 (514) 88.0 (2235) 43.0 (1090) 41.5 (1055)

RAH090 1340 (609) 88.0 (2235) 43.0 (1090) 49.5 (1255)RAH102 1340 (609) 88.0 (2235) 43.0 (1090) 49.5 (1255)

RAH110/120 1580 (718) 88.0 (2235) 31.5 (775) 49.5 (1255)

CAUTIONUNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage.All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.

REMOVABLE HORIZONTALSUPPLY DUCT OPENING COVER

REMOVABLE HORIZONTALRETURN DUCT OPENING COVER

BASEPAN

NOTCHES NOTCHES


Fig. 10 — Horizontal Duct Panels In Place

Step 8 — Install Outside Air Hood

ECONOMIZER AND TWO-POSITION DAMPER HOODPACKAGE REMOVAL AND SETUP (FACTORYOPTION)

The hood is shipped in knock-down form and must be fieldassembled. The indoor coil access panel is used as thehood top while the hood sides, divider and filter are pack-aged together, attached to a metal support tray using plasticstretch wrap, and shipped in the return air compartment be-hind the indoor coil access panel. The hood assembly’smetal tray is attached to the basepan and also attached tothe damper using two plastic tie-wraps.1. To gain access to the hood, remove the filter access

panel. (See Fig. 11.)2. Locate the (2) screws holding the metal tray to the

basepan and remove. Locate and cut the (2) plastictie-wraps securing the assembly to the damper. (SeeFig. 12.) Be careful to not damage any wiring or cuttie-wraps securing any wiring.

Fig. 11 — Typical Access Panel Locations

Fig. 12 — Economizer and Two-Position Damper Hood Parts Location

3. Carefully lift the hood assembly (with metal tray)through the filter access opening and assemble perthe steps outlined in the Economizer Hood and Two–Position Hood section below.

ECONOMIZER HOOD AND TWO-POSITION HOOD

NOTE: If the power exhaust accessory is to be installed onthe unit, the hood shipped with the unit will not be used andmust be discarded. Save the aluminum filter for use in thepower exhaust hood assembly.1. The indoor coil access panel will be used as the top

of the hood. Remove the screws along the sides andbottom of the indoor coil access panel. See Fig. 13.

Fig. 13 — Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert thehood sides under the panel (hood top). Use thescrews provided to attach the hood sides to the hoodtop. Use screws provided to attach the hood sides tothe unit. See Fig. 14.

SCREWS

DUCT COVERSSHEET METALFACE UP

BASEPAN

FILTER ACCESS PANEL

OUTDOOR-AIR OPENING ANDINDOOR COIL ACCESS PANEL

COMPRESSORACCESS PANEL

Hood Parts

Plastic Tie WrapQty (2)

Screws for Metal TrayQty (2)

TOPPANEL

INDOORCOILACCESSPANEL

INDOORCOILACCESSPANEL

CAULKHERE

TOPPANEL


Fig. 14 — Economizer Hood Construction

3. Remove the shipping tape holding the economizerbarometric relief damper in place (economizer only).

4. Insert the hood divider between the hood sides. SeeFig. 14 and 15. Secure hood divider with 2 screws oneach hood side. The hood divider is also used as thebottom filter rack for the aluminum filter.

5. Open the filter clips which are located underneath thehood top. Insert the aluminum filter into the bottom fil-ter rack (hood divider). Push the filter into positionpast the open filter clips. Close the filter clips to lockthe filter into place. See Fig. 15.

6. Caulk the ends of the joint between the unit top paneland the hood top.

7. Replace the filter access panel.

Fig. 15 — Economizer Filter Installation

Step 9 — Install External Condensate Trap andLineThe unit has one 3/4-in. condensate drain connection on theend of the condensate pan and an alternate connection onthe bottom. See Fig. 16. Unit airflow configuration does notdetermine which drain connection to use. Either drain con-nection can be used with vertical or horizontal applications.When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Do thisbefore setting the unit in place. The red drain pan can betightened with a 1/2-in. square socket drive extension.To use the alternate bottom drain connection, remove thered drain plug from the bottom connection (use a 1/2-in.square socket drive extension) and install it in the side drainconnection.

The piping for the condensate drain and external trap canbe completed after the unit is in place. See Fig. 17.

Fig. 16 — Condensate Drain Pan (Side View)

Fig. 17 — Condensate Drain Pan Piping Details

All units must have an external trap for condensate drain-age. Install a trap at least 4 in. (102 mm) deep and protectagainst freeze-up. If drain line is installed downstream fromthe external trap, pitch the line away from the unit at 1 in. per10 ft (25 mm per 3 m) of run. Do not use a pipe size smallerthan the unit connection (3/4 in.).

B

TOPPANEL

INDOOR COILACCESS PANEL

19 1/16″SCREW

HOOD DIVIDER

LEFTHOODSIDE

33 3/8″(848 mm)

(483 mm)

DIVIDER

BAROMETRICRELIEF

CLEANABLEALUMINUMFILTER

FILTER

HOOD

FILTERCLIP

OUTSIDEAIR

DRAIN(FACTORY-INSTALLED)

PLUG

CONDENSATE PAN (SIDE VIEW)

STANDARDSIDE DRAIN

ALTERNATEBOTTOM DRAIN

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4-in. (102 mm) trap is recommended.

MINIMUM PITCH1˝ (25 mm) PER10´ (3 m) OF LINE

BASE RAIL

OPENVENT

TO ROOFDRAIN

DRAIN PLUG

ROOFCURB

SEE NOTE

3˝ (76 mm)MIN


Step 10 — Make Electrical Connections

NOTE: Field-supplied wiring shall conform with the limita-tions of minimum 63°F (33°C) rise.

FIELD POWER SUPPLY

If equipped with optional Powered Convenience Outlet: Thepower source leads to the convenience outlet’s transformerprimary are not factory connected. Installer must connectthese leads according to required operation of the conve-nience outlet. If an always-energized convenience outlet op-eration is desired, connect the source leads to the line sideof the unit-mounted disconnect. (Check with local codes toensure this method is acceptable in your area.) If a de-ener-gize via unit disconnect switch operation of the convenienceoutlet is desired, connect the source leads to the load sideof the unit disconnect. On a unit without a unit-mounted dis-connect, connect the source leads to compressor contactorC and indoor fan contactor (IFC) pressure lugs with unit fieldpower leads. See Fig. 18.Refer to Fig. 24 on page 18 for power transformer connec-tions and the discussion on connecting the convenienceoutlet on page 17.Field power wires are connected to the unit at line-sidepressure lugs on compressor contactor C and indoor fancontactor IFC (see wiring diagram label for control box com-ponent arrangement), at factory-installed option non-fuseddisconnect switch. Max wire size is #4 AWG (copper only)per pole on contactors and #2 ga AWG (copper only) perpole on optional non-fused disconnect. See Fig. 18 and theunit label diagram for field power wiring connections.NOTE: TEST LEADS — Unit may be equipped with shortleads (pigtails) on the field line connection points on contac-tor C or optional disconnect switch. These leads are for fac-tory run-test purposes only; remove and discard before con-necting field power wires to unit connection points. Makefield power connections directly to line connection pressurelugs only.

Fig. 18 — Power Wiring Connections

WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal in-jury or death.Unit cabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility of personalinjury if an electrical fault should occur. This groundmay consist of electrical wire connected to unit groundlug in control compartment, or conduit approved forelectrical ground when installed in accordance withNEC (National Electrical Code); ANSI/NFPA 70, latestedition (in Canada, Canadian Electrical Code CSA [Ca-nadian Standards Association] C22.1), and local elec-trical codes.

Units With Electric Heat Option with Single Point Boxand Without Disconnect Option

L1

L2

L3

Single Point Box

FactoryWiring

Equip GRLug

Ground (GR)

Terminal Block

— OR —

L1

L2

L3

BLK

YEL

BLU

BLK

YEL

BLU

Single Point Box

FactoryWiring

Equip GRLug

Ground (GR)

Fuse/Terminal BlockFuse

Fuse

Fuse

Disconnectper

NEC

13 11 13

L1 L2 L3

C IFC

208/230-3-60460-3-60575-3-60

Units Without Disconnect Option

Units With Disconnect Option

L3

L2

L1

L3

L2

L1

T3

T1

OptionalDisconnect

Switch

Disconnect factory test leads; discard.

FactoryWiring

T2

BLU

BLK

YEL

Ground(GR)

EquipGR Lug

Equip GR LugGround

(GR)


Fig. 19 — Disconnect Switch and Unit

UNITS WITH FACTORY-INSTALLED NON-FUSEDDISCONNECT

The factory-installed optional non-fused disconnect (NFD)switch is located in a weatherproof enclosure located underthe main control box (see Fig. 20). The manual switch han-dle and shaft are shipped in the disconnect enclosure. As-semble the shaft and handle to the switch at this point. Dis-card the factory test leads (see Fig. 18).Connect field power supply conductors to LINE side termi-nals when the switch enclosure cover is removed to attachthe handle.

Fig. 20 — Location of Non-Fused Disconnect Enclosure

Field-Install the NFD Shaft and Handle1. Remove the unit front panel (see Fig. 2 on page 4 or

Fig. 3 on page 6).2. Remove (3) hex screws on the NFD enclosure — (2)

on the face of the cover and (1) on the left side cover.See Fig. 21.

3. Remove the front cover of the NFD enclosure.4. Make sure the NFD shipped from the factory is at

OFF position (the arrow on the black handle knob isat OFF).

5. Insert the shaft with the cross pin on the top of theshaft in the horizontal position.

6. Measure from the tip of the shaft to the top surface ofthe black pointer; the measurement should be 3.75 to3.88 in. (95 to 99 mm).

7. Tighten the locking screw to secure the shaft to theNFD.

8. Turn the handle to the OFF position with red arrowpointing at OFF.

9. Install the handle on to the painted cover horizontallywith the red arrow pointing to the left.

10. Secure the handle to the painted cover with (2)screws and lock washers supplied.

11. Engaging the shaft into the handle socket, re-install(3) hex screws on the NFD enclosure.

12. Re-install the unit front panel.

Fig. 21 — Handle and Shaft Assembly for NFD

UNITS WITHOUT FACTORY-INSTALLED DISCONNECT

When installing units, provide a disconnect switch per NEC(National Electrical Code) of adequate size. Disconnect siz-ing data is provided on the unit informative plate. Locate onunit cabinet or within sight of the unit per national or localcodes. Do not cover unit informative plate if mounting thedisconnect on the unit cabinet.

ALL UNITS

All field wiring must comply with NEC and all local codes.Size wire based on MCA (Minimum Circuit Amps) on theunit informative plate. See Fig. 18 and the unit label diagramfor power wiring connections to the unit power terminalblocks and equipment ground. Maximum wire size is #4 gaAWG (copper only) per pole on contactors and #2 ga AWG(copper only) per pole on optional non-fused disconnect.Provide a ground-fault and short-circuit over-current protec-tion device (fuse or breaker) per NEC Article 440 (or localcodes). Refer to unit informative data plate for MOCP (Max-imum Over-current Protection) device size.All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit is tobe connected to a 208-v power supply, the control trans-former must be rewired by moving the black wire with the1/4-in. female spade connector from the 230-v connectionand moving it to the 200-v 1/4-in. male terminal on the pri-mary side of the transformer. Refer to unit label diagramfor additional information. Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balancedwithin 2% and the current within 10%. Use the formulashown in the following example to determine the percentof voltage imbalance.

WARNINGFIRE HAZARDFailure to follow this caution could result in personal in-jury, fire, death, or property damage.Do not connect aluminum wire between disconnectswitch and RAH unit. Use only copper wire. See Fig.19.

COPPER

WIRE ONLY

ELECTRICDISCONNECT

SWITCH

ALUMINUMWIRE


Example: Supply voltage is 230-3-60

AB = 224 v BC = 231 v AC = 226 v

Determine maximum deviation from average voltage.(AB) 227-224 = 3 v(BC) 231-227 = 4 v(AC) 227-226 = 1 vMaximum deviation is 4 v.Determine percent of voltage imbalance.

This amount of phase imbalance is satisfactory as it is be-low the maximum allowable 2%.

Operation on improper line voltage or excessive phase im-balance constitutes abuse and may cause damage to elec-trical components. Such operation would invalidate any ap-plicable warranty.NOTE: Check all factory and field electrical connections fortightness.

CONVENIENCE OUTLETS

Two types of convenience outlets are offered as factory-in-stalled options on RAH models: non-powered and unit-pow-ered. Both types provide a 125-volt GFCI (ground fault cir-cuit interrupter) duplex receptacle rated at 15A behind ahinged waterproof access cover, located on the end panelof the unit. See Fig. 22.A 20 amp non-powered convenience outlet is available as afield-installed accessory.Installing Weatherproof CoverA weatherproof while-in-use cover for the factory-installedconvenience outlets is now required by UL standards. Thiscover cannot be factory-mounted due its depth; it must beinstalled at unit installation. For shipment, the convenienceoutlet is covered with a blank cover plate.The weatherproof cover kit is shipped in the unit’s controlbox. The kit includes the hinged cover, a backing plate andgasket.DIsconnect all power to unit and convenience outlet. Lock-out and tag-out all power.Remove the blank cover plate at the convenience outlet;discard the blank cover.Loosen the two screws at the GFCI duplex outlet, until ap-proximately 1/2-in. (13 mm) under screw heads is exposed.Press the gasket over the screw heads. Slip the backing

plate over the screw heads at the keyhole slots and alignwith the gasket; tighten the two screws until snug (do notover-tighten).Mount the weatherproof cover to the backing plate asshown in Fig. 23. Remove two slot fillers in the bottom of thecover to permit service tool cords to exit the cover. Checkfor full closing and latching.

Fig. 22 — Convenience Outlet Location

Fig. 23 — Weatherproof Cover Installation

Non-Powered Convenience OutletThis type requires the field installation of a general-purpose125v 15A circuit powered from a source elsewhere in thebuilding. Observe national and local codes when selectingwire size, fuse or breaker requirements, and disconnectswitch size and location. Route 125v power supply conduc-tors into the bottom of the utility box containing the duplexreceptacle.Unit-Powered TypeA unit-mounted transformer is factory-installed to stepdownthe main power supply voltage to the unit to 115v at the du-plex receptacle. This option also includes a manual switchwith fuse, located in a utility box and mounted on a bracketbehind the convenience outlet; access is through the unit’scontrol box access panel. See Fig. 22.The primary leads to the convenience outlet transformer arenot factory-connected. Selection of primary power source isa customer option. If local codes permit, the transformer pri-mary leads can be connected at the line-side terminals onthe unit-mounted non-fused disconnect; this will provideservice power to the unit when the unit disconnect switch is

Average Voltage =(224 + 231 + 226)

=681

= 2273 3

% Voltage Imbalance = 100 x4

= 1.76%227

IMPORTANT: If the supply voltage phase imbalance ismore than 2%, contact your local electric utility compa-ny immediately.

WARNINGELECTRICAL OPERATION HAZARDFailure to follow this caution could result in personal in-jury or death.Units with convenience outlet circuits may use multipledisconnects. Check convenience outlet for power sta-tus before opening unit for service. Locate its discon-nect switch, if appropriate, and open it. Lock-out andtag-out this switch, if necessary.

A B C

MOTOR

CONVENIENCEOUTLET GFCI

CONTROL BOXACCESS PANEL

COVER - WHILE-IN-USEWEATHERPROOF

BASEPLATE FORGFCI RECEPTACLE

GASKET

GFCI RECEPTACLENOT INCLUDED

TOP

TOP

TOP

WET LOCATIONS

WET LOCATIONS


open. Other connection methods will result in the conve-nience outlet circuit being de-energized when the unit dis-connect switch is open. See Fig. 24.

Fig. 24 — Powered Convenience Outlet Wiring

Duty CycleThe unit-powered convenience outlet has a duty cycle lim-itation. The transformer is intended to provide power on anintermittent basis for service tools, lamps, etc; it is not in-tended to provide 15-amps loading for continuous dutyloads (such as electric heaters for overnight use). Observea 50% limit on circuit loading above 8 amps (i.e., limit loadsexceeding 8 amps to 30 minutes of operation every hour).Test the GFCI receptacle by pressing the TEST button onthe face of the receptacle to trip and open the receptacle.Check for proper grounding wires and power line phasing ifthe GFCI receptacle does not trip as required. Press theRESET button to clear the tripped condition.Fuse On Power TypeThe factory fuse is a Bussman “Fusetron” T-15, non-renew-able screw-in (Edison base) type plug fuse.Using Unit-Mounted Convenience OutletsUnits with unit-mounted convenience outlet circuits will oftenrequire that two disconnects be opened to de-energize allpower to the unit. Treat all units as electrically energized un-til the convenience outlet power is also checked and de-en-ergization is confirmed. Observe National Electrical CodeArticle 210, Branch Circuits, for use of convenience outlets.

FACTORY-OPTION THRU-BASE CONNECTIONS

This service connection kit consists of a 1/2-in. and a 3/4-in.electrical bulkhead connector, all factory-installed in theembossed (raised) section of the unit basepan in the con-denser section. The 3/4-in. bulkhead connector enables thelow-voltage control wires to pass through the basepan.The 1/2-in. electrical bulkhead connector allows the high-voltage power wires to pass through the basepan. SeeFig. 25.

Fig. 25 — Thru-Base Connection Fittings

Check tightness of connector lock nuts before connectingelectrical conduits.Field-supplied and field-installed liquid tight conduit con-nectors and conduit may be attached to the connectors onthe basepan. Pull correctly rated high voltage and low volt-age through appropriate conduits. Connect the power con-duit to the internal disconnect (if unit is so equipped) or tothe external disconnect (through unit side panel). A holemust be field cut in the main control box bottom on the leftside so the 24-v control connections can be made. Con-nect the control power conduit to the unit control box at thishole.

UNITS WITHOUT THRU-BASE CONNECTIONS

1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and controlbox.

2. Install power lines to terminal connections as shownin Fig. 18 on page 15.

FIELD CONTROL WIRING

The RAH unit requires an external temperature control de-vice. This device can be a thermostat emulation device pro-vided as part of a third-party Building Management System.

THERMOSTAT

Select an approved accessory thermostat. When electricheat is installed in the RAH unit, the thermostat must be ca-pable of energizing the G terminal (to energize the IndoorFan Contactor) whenever there is a space call for heat (en-ergizing the W1 terminal). The accessory thermostats listedon the unit price pages can provide this signal but they arenot configured to enable this signal as shipped.Install the accessory thermostat according to installation in-structions included with the accessory.Locate the thermostat accessory on a solid wall in the con-ditioned space to sense average temperature in accor-dance with the thermostat installation instructions.If the thermostat contains a logic circuit requiring 24-v pow-er, use a thermostat cable or equivalent single leads of dif-ferent colors with minimum of seven leads. If the thermostatdoes not require a 24-v source (no “C” connection required),use a thermostat cable or equivalent with minimum of sixleads. Check the thermostat installation instructions for ad-ditional features which might require additional conductorsin the cable.Typical low-voltage connections are shown in Fig. 26.For wire runs up to 50 ft. (15 m), use no. 18 AWG (AmericanWire Gage) insulated wire (35°C minimum). For 50 to 75 ft.(15 to 23 m), use no. 16 AWG insulated wire (35°C mini-mum). For over 75 ft. (23 m), use no. 14 AWG insulatedwire (35°C minimum). All wire sizes larger than no. 18 AWGcannot be directly connected to the thermostat and will re-quire a junction box and splice at the thermostat.

UNIT VOLTAGE

CONNECT AS

PRIMARY CONNECTIONS

TRANSFORMER TERMINALS

208, 230 240 L1: RED + YELL2: BLU + GRA

H1 + H3H2 + H4

460 480L1: REDSplice BLU + YELL2: GRA

H1H2 + H3

H4

575 600 L1: REDL2: GRA

H1H2

LOW VOLTAGECONDUITCONNECTOR

HIGH VOLTAGECONDUITCONNECTOR


Central Terminal BoardThe Central Terminal Board (CTB) is a pass through con-nection point. The CTB provides the capability to add facto-ry-installed options and field-installed accessories to theunits by cutting jumper wires without having to change or re-route wires through the structure of the unit. The CTB doesnot provide any microprocessor control; it is simply a basicmultifunction wiring terminal configuration.Unit Without Thru-Base Connection KitPass the thermostat control wires through the hole providedin the corner post; then feed the wires through the racewaybuilt into the corner post to the control box. Pull the wiresover to the terminal strip on the upper-left corner of the Con-trols Connection Board. See Fig. 26 and 27.

Fig. 26 — Typical Low Voltage Control Connections

Fig. 27 — Field Control Wiring Raceway

NOTE: If thru-the-bottom connections accessory is used,refer to the accessory installation instructions for informationon routing power and control wiring.Heat Anticipator SettingsSet heat anticipator settings at 0.14 amp for the first stageand 0.14 amp for second-stage heating, when available.

Electric HeatersThe RAH units may be equipped with field-installed acces-sory electric heaters. The heaters are modular in design,with heater frames holding open coil resistance wires strungthrough ceramic insulators, line-break limit switches and acontrol contactor. One or two heater modules may be usedin a unit.Heater modules are installed in the compartment below theindoor (supply) fan outlet. Access is through the indoor ac-cess panel. Heater modules slide into the compartment ontracks along the bottom of the heater opening. SeeFig. 28-30.Not all available heater modules may be used in every unit.Use only those heater modules that are UL listed for use ina specific size unit. Refer to the label on the unit cabinet forthe list of approved heaters.Unit heaters are marked with Heater Model Numbers. Butheaters are ordered as and shipped in cartons marked witha corresponding Heater Sales Package part number. SeeTable 3 for correlation between Heater Model Number andSales Package part number.NOTE: The value in position 9 of the part number differs be-tween the sales package part number (value is 1) and abare heater model number (value is 0).

Fig. 28 — Typical Access Panel Location

Fig. 29 — Typical Component Location

X

C

G

W2

R

C

W2

G

W1

O/B/Y2 Y2

W1

R

Y1 Y1

Connections

THERMOSTAT

(Note 1) (Note 2)

1. Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2.2. Y2 to Y2 connection required on single-stage cooling units when integrated economizer function is desired. Field Wiring

Board

Notes:

RACEWAY

HOLE IN END PANEL (HIDDEN)

DISCONNECT MOUNTINGLOCATION

UNIT BLOCK-OFFPANEL

OUTDOORACCESS PANEL

INDOORACCESSPANEL

DISCONNECTMOUNTINGLOCATION

EMT OR RIGID CONDUIT(FIELD-SUPPLIED)

SINGLEPOINT BOX

CENTERPOST

HEATERCOVERS

HEATERMOUNTINGBRACKET

HEATERMODULE(LOCATION 2)

HEATERMODULE(LOCATION 1)

SINGLE POINTBOXMOUNTINGSCREW

BRACKET ANDCONDUITDRIP BOOT

MAINCONTROLBOX

CONTROL WIRE TERMINAL BLOCK

MANUAL RESETLIMIT SWITCH


SINGLE POINT BOXES AND SUPPLEMENTARYFUSES

When the unit MOCP device value exceeds 60-A, unit-mounted supplementary fuses are required for each heatercircuit. These fuses are included in accessory single pointboxes, with power distribution and fuse blocks. The singlepoint box will be installed directly under the unit control box,just to the left of the partition separating the indoor section(with electric heaters) from the outdoor section. The singlepoint box has a hinged access cover. See Fig. 31. The sin-gle point box also includes a set of power taps and pigtailsto complete the wiring between the single point box and theunit’s main control box terminals. Refer to the accessoryheater and single point box installation instructions for de-tails on tap connections.All fuses on RAH units are 60-A. (Note that all heaters arequalified for use with a 60-A fuse, regardless of actual heat-er ampacity, so only 60-A fuses are necessary.)

SINGLE POINT BOXES WITHOUT FUSES

Unit heater applications not requiring supplemental fusesrequire a special single point box without any fuses. The ac-cessory single point boxes contain a set of power taps andpigtails to complete the wiring between the single point boxand the unit’s main control box terminals. Refer to accesso-ry heater and single point box installation instructions for de-tails on tap connections on field-installed electric heat ac-cessory.

Fig. 30 — Typical Module Installation

Fig. 31 — Typical Single Point Installation

Table 3 — Heater Model Number

Bare Heater Model Number C R H E A T E R 0 0 1 A 0 0Heater Sales Package PNOIncludes:

Bare HeaterCarton and packing materialsInstallation sheet

C R H E A T E R 1 0 1 A 0 0

TRACK

FLANGE

ALLIED PA

MODEL NO.

ERIAL NO.

CORP.

1113

2123

OD

22.2

3123

ISTED AIRNDITIONINGUIP ACCESS 346N.

P / N 2- 5610-4 REV

1113

2123

CONTROLBOX

BUSHING

SINGLEPOINT BOXMOUNTINGSCREWS

FOAMBUSHING

DRIP BOOTBRACKETMOUNTINGSCREWS

HEATERRELAYS

POWERWIRES

HEATERMOUNTINGSCREWS


LOW-VOLTAGE CONTROL CONNECTIONS

Pull the low-voltage control leads from the heater module(s)— VIO and BRN (two of each if two modules are installed;identify for Module #1) — to the 4-pole terminal board TB4located on the heater bulkhead to the left of Heater #1. Con-nect the VIO lead from Heater #1 to terminal TB4-1. For 2-stage heating, connect the VIO lead from Heater #2 to ter-minal TB4-2. For 1-stage heating with 2 heater modulesconnect the VIO lead from both Heater #1 and #2 to termi-nal TB4-1. Connect both BRN leads to terminal TB4-3. SeeFig. 32.

Fig. 32 — Optional or Accessory Electric Heater Control Connections (2-Stage Heating Shown)

Hot Gas Re-Heat Control Connections

HOT GAS RE-HEAT – SPACE RH CONTROLLER

NOTE: Hot Gas Re-Heat dehumidification system is a fac-tory-installed option which is only available for unitsequipped with belt-drive motors.The Hot Gas Re-Heat dehumidification system requires afield-supplied and installed space relative humidity controldevice. This device may be a separate humidistat control(contact closes on rise in space RH above control setpoint)or a combination thermostat-humidistat control device withisolated contact set for dehumidification control. The humid-istat is normally used in applications where a temperaturecontrol is already provided (such as a third-party BuildingManagement System).To connect a field-supplied humidistat:1. Route the humidistat 2-conductor cable (field-sup-

plied) through the hole provided in the unit cornerpost.

2. Feed wires through the raceway built into the cornerpost (see Fig. 27 on page 19) to the 24-v barrierlocated on the left side of the control box. The race-way provides the UL-required clearance betweenhigh-voltage and low-voltage wiring.

3. Use wire nuts to connect humidistat cable to twoPINK leads in the low-voltage wiring as shown inFig. 33. Refer to the instructions for the field-suppliedhumidistat for more information.

To connect a field-installed programmablethermidistat:1. Route the programmable thermidistat multi-conduc-

tor cable (field-supplied) through the hole provided inthe unit corner post.

2. Feed wires through the raceway build into the cornerpost (see Fig. 27 on page 19) to the 24-v barrierlocated on the left side of the control box. The race-way provides the UL-required clearance betweenhigh-voltage and low-voltage wiring.

3. The programmable thermostat has dry contacts atterminals D1 and D2 for dehumidification operation(see Fig. 34). The dry contacts must be wiredbetween CTB terminal R and the PNK/BLK lead tothe LTLO switch with field-supplied wire nuts. Referto the installation instructions included with the pro-grammable thermidistat device for more information.

HR1: On Heater 1 in Position #1HR2: On Heater 2 in Position #2 (if installed)

2

3

12

1 32TB4

HR2

HR1

Elec Htr

CONTLBOARD

CTB

FieldConnections

VIO BRN BRNVIO

VIO BRN

VIO BRN

ORN

BRN

VIO

ORN VIO BRN


Fig. 33 — Typical Humidistat Wiring for Hot Gas Re-Heat Dehumidification System

Fig. 34 — Thermostat Device Connections for RAH Unit with Hot Gas Re-Heat Dehumidification System

RcRhW1

GY2C

O/W2/BY1

OATRRS

SRTNHUM

D1D2V+Vg

X*

C

G

W2

W1

Y2

Y1

R

THERMIDISTATUnit CTB

THERMOSTAT

*Connection not required.

Hot Gas Re-Heat FIOP


2-Speed Indoor Fan Motor System with VFD(Factory-Installed Option)For details on operating RAH 2 stage cooling unitsequipped with the factory-installed 2-Speed Indoor Fan Mo-tor System with VFD (Variable Frequency Drive) option, re-fer to the Variable Frequency Drive (VFD) Installation, Start-up and Service Instructions.

Economi$er® X (Factory Option)The EconoMi$er X system is an expandable economizercontrol system, which includes a W7220 economizer mod-ule (controller) with an LCD and keypad (See Fig. 35). TheW7220 can be configured with optional sensors.

Fig. 35 — W7220 Economizer Module

The W7220 economizer module can be used as a stand-alone economizer module wired directly to a commercialset-back space thermostat and sensors to provide outsideair dry-bulb economizer control.The W7220 economizer module can be connected to op-tional sensors for single or differential enthalpy control. TheW7220 economizer module provides power and communi-cations for the sensors.The W7220 economizer module automatically detects sen-sors by polling to determine which sensors are present. If asensor loses communications after it has been detected,the W7220 economizer controller indicates a device fail er-ror on its LCD.

SYSTEM COMPONENTS

The EconoMi$er X system includes an economizer module,20k mixed air sensor, damper actuator, and either a 20koutdoor air temperature sensor or S-Bus enthalpy sensors.Economizer ModuleThe module is the core of the EconoMi$er X system. Themodule is mounted in the unit’s control box, and includesthe user interface for the system. The W7220 economizermodule provides the basic inputs and outputs to providesimple economizer control. When used with the optionalsensors, the economizer module provides more advancedeconomizer functionality.S-Bus Enthalpy Control Sensors The sensor is a combination temperature and humidity sen-sor which is powered by and communicates on the S-Bus.Up to three sensors may be configured with the W7220economizer module.CO2 Sensor (optional) The sensor can be added for Demand Controlled Ventila-tion (DCV).

SpecificationsW7220 Economizer Module The module is designed for use with 2 to 10 Vdc or buscommunicating actuator. The module includes terminals forCO2 sensor, Mixed Air sensor, and an Outdoor Dry Bulbsensor. Enthalpy and other options are available with bussensors.User InterfaceProvides status for normal operation, setup parameters,checkout tests, and alarm and error conditions with a 2-line16 character LCD display and four button keypad.Electrical• Rated Voltage — 20 to 30 vac RMS, 50/60 Hz• Transformer — 100 va maximum system input• Nominal Power Consumption (at 24 vac, 60 Hz) —

11.5 VA without sensors or actuators• Relay Digital Output Rating at 30 vac (maximum

power from Class 2 input only) — 1.5A run:3.5A inrush at 0.45PF (200,000 cycles) or7.5A inrush at 0.45PF (100,000 cycles)

• External Sensors Power Output — 21 vdc ± 5% at48mA

InputsSensorsNOTE: A Mixed Air (MA) analog sensor is required on allW7220 units; either an Outdoor Air (OA) sensor for dry bulbchange over or an OA bus sensor for outdoor enthalpychange over is required in addition to the MA sensor. An ad-ditional Return Air (RA) bus sensor can be added to the sys-tem for differential enthalpy or dry bulb changeover. For dif-ferential dry bulb changeover a 20k ohm sensor is requiredin the OA and a bus sensor in the RA. DIP switch on RA bussensor must be set in the RA position.Dry Bulb Temperature (optional) and Mixed Air (required),20k NTC

2-wire (18 to 22 AWG);Temperature range –40 to 150°F (–40 to 65°C)Temperature accuracy –0°F/+2°F

Temperature and Humidity, C7400S1000 (optional)S-Bus; 2-wire (18 to 22 AWG)Temperature: range –40 to 150°F (–40 to 65°C)Temperature accuracy –0°F/+2°FHumidity: range 0 to 100% RH with 5% accuracy.

NOTE: Up to three (3) S-Bus sensors may be connected tothe W7220 economizer module. For outdoor air (OA),return air (RA) and discharge (supply) air (DA).4 Binary Inputs

1-wire 24 vac + common GND (see page 25 for wiringdetails). 24 vac power supply

20 to 30 vac 50/60Hz; 100 VA Class 2 transformer.

IMPORTANT: All inputs and outputs must be Class2 wiring.


OutputsActuator Signal 2-10 vdc; minimum actuator impedance is 2k ohm; bustwo-wire output for bus communicating actuators.Exhaust fan, Y1, Y2 and AUX1 O

All Relay Outputs (at 30 vac):Running: 1.5A maximumInrush: 7.5A maximum

EnvironmentalOperating Temperature

–40°F to 150°F (–40°C to 65°C).Exception of display operation down to –4°F with fullrecovery at –4°F from exposure to –40°FStorage Temperature

–40°F to 150°F (–40°C to 65°C)Shipping Temperature

–40°F to 150°F (-40°C to 65°C)Relative Humidity

5% to 95% RH non-condensingEconomizer Module Wiring Details Use Fig. 36 and Tables and to locate the wiring terminalsfor the Economizer module.NOTE: The four terminal blocks are removable. Slide outeach terminal block, wire it, and then slide it back into place.

Fig. 36 — W7220 Wiring Terminals

* Sylk is a trademark of Honeywell International Inc.

S-Bus Sensor WiringThe labels on the sensors and controller are color coded forease of installation. Orange labeled sensors can only bewired to orange terminals on the controller. Brown labeledsensors can only be wired to S-bus (brown) terminals. UseFig. 37 and Table 6 to locate the wiring terminals for eachS-Bus sensor.Use Fig. 37 and Table 6 to locate the wiring terminals foreach enthalpy control sensor.

NA

AUX2-

OCC

E-GND

EXH1

AUX1-O

Y2-

Y1-

Y2-O

Y1-O

C

R

50048848-002Rev. A

NA

A2

OCC

EX

A1

Y2I

Y2O

Y1I

Y1O

C

R

Cert ProductCalifornia Title 24, Part 6

HJW10www.energy.ca.gov

MAT

MAT

OAT

OAT

S-BUS

S-BUS

IAQ 2-10

IAQ COM

IAQ 24V

ACT 2-10

ACT COM

ACT 24V

MAMA

OAOA

SBSB

SBSB

SBSB

VCR

VCR

NA

50040839-001Rev. G

Table 4 — Economizer Module - Left Hand Terminal Blocks

LABEL TYPE DESCRIPTIONTOP LEFT TERMINAL BLOCK

MATMAT

20K NTC and COM

Mixed Air Temperature Sensor (Polarity Insensitive Connection)

OATOAT

20K NTC and COM

Outdoor Air Temperature Sensor (Polarity Insensitive Connection)

S-BUSS-BUS

S-BUS (Sylk* Bus)

Enthalpy Control Sensor (Polarity Insensitive Connection)

BOTTOM LEFT TERMINAL BLOCK

IAQ 2-10 2-10 VDC Air Quality Sensor Input(e.g. CO2 sensor)

IAQ COM COM Air Quality Sensor CommonIAQ 24V 24 VAC Air Quality Sensor 24 VAC SourceACT 2-10 2-10 VDC Damper Actuator Output (2-10 VDC)ACT COM COM Damper Actuator Output CommonACT 24V 24 VAC Damper Actuator 24 VAC Source

Table 5 — Economizer Module - Right Hand Terminal Blocks

LABEL TYPE DESCRIPTIONTOP RIGHT TERMINAL BLOCKS

AUX2 I 24 VAC IN The first terminal is not used.

OCC 24 VAC IN

Shut Down (SD) or HEAT (W) Conven-tional onlyandHeat Pump Changeover (O-B) in Heat Pump mode.

E-GND E-GND Occupied/Unoccupied Input

EXH1 24 VAC OUT

Exhaust Fan 1 Output

AUX1 O 24 VAC OUT

Programmable:Exhaust fan 2 outputorERVorSystem alarm output

BOTTOM RIGHT TERMINAL BLOCKS

Y2-I 24 VAC IN Y2 in - Cooling Stage 2 Input from space thermostat

Y2-O 24 VAC OUT

Y2 out - Cooling Stage 2 Output to stage 2 mechanical cooling

Y1-I 24 VAC IN Y1 in - Cooling Stage 2 Input from space thermostat

Y1-O 24 VAC OUT

Y1 out - Cooling Stage 2 Output to stage 2 mechanical cooling

C COM 24 VAC CommonR 24 VAC 24 VAC Power (hot)


Fig. 37 — S-Bus Sensor DIP Switches

Use Fig. 37 and Table 7 to set the DIP switches for the de-sired use of the sensor.

NOTE: When an S-Bus sensor is connected to an existingnetwork, it will take 60 minutes for the network to recognizeand auto-configure itself to use the new sensor.During the 60-minute setup period, no alarms for sensorfailures (except SAT) will be issued and no economizingfunction will be available.CO2 Sensor WiringWhen using a CO2 sensor the black and brown commonwires are internally connected and only one is connected to“IAQ COM” on the W7220. Use the power from the W7220to power the CO2 sensor OR make sure the ground for thepower supplies are common. See Fig. 38 for CO2 sensorwiring.

Fig. 38 — CO2 Sensor Wiring

Interface OverviewThis section describes how to use the EconoMi$er® user in-terface for:• Keypad and menu navigation• Settings and parameter changes• Menu structure and selection

User InterfaceThe user interface consists of a 2-line LCD display and a 4-button keypad on the front of the economizer controller.KeypadUse the four navigation buttons (see Fig. 39) to scrollthrough the menus and menu items, select menu items,and to change parameter and configuration settings.

To use the keypad when working with menus:• Press the ▲ (Up arrow) button to move to the previ-

ous menu.• Press the ▼ (Down arrow) button to move to the next

menu.• Press the (Enter) button to display the first item in

the currently displayed menu.• Press the (Menu Up/Exit) button to exit a menu’s

item and return to the list of menus.

Fig. 39 — W7220 Controller Navigation Buttons

To use the keypad when working with Setpoints, Systemand Advanced Settings, Checkout tests and Alarms:1. Navigate to the desired menu.2. Press the (Enter) button to display the first item in

the currently displayed menu.3. Use the ▲ and ▼ buttons to scroll to the desired

parameter.

Table 6 — HH57AC081 Sensor Wiring Terminations

TERMINALTYPE DESCRIPTION

NUMBER LABEL

1 S-BUS S-BUS

S-BUS Communications (Enthalpy Control

Sensor Bus)

2 S-BUS S-BUS

S-BUS Communications (Enthalpy Control

Sensor Bus)

Table 7 — HH57AC081 Sensor DIP Switch

USEDIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3

1 2 3DA OFF ON OFFRA ON OFF OFFOA OFF OFF OFF

DIPSWITCHLABEL

DIPSWITCHES(3)

S-BUS2 PIN SIDECONNECTOR

S-BUSTERMINALS(1 AND 2)

CO2 SENSOR

24V

ANALOGOUT

L1(HOT)L2

RED

BLACK

YELLOW

BROWN

ORANGE

GREEN

+

–

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIONAS REQUIRED.

1

1


4. Press the (Enter) button to display the value ofthe currently displayed item.

5. Press the ▲ button to increase (change) the dis-played parameter value.

6. Press the ▼ button to decrease (change) the dis-played parameter value.

NOTE: When values are displayed, pressing and holdingthe ▲or ▼ button causes the display to automatically incre-ment or decrement.1. Press the (Enter) button to accept the displayed

value and store it in nonvolatile RAM. “CHANGESTORED” displays.

2. Press the (Enter) button to return to the currentmenu parameter.

3. Press the (Menu Up/Exit) button to return to theprevious menu.

Menu StructureTable illustrates the complete hierarchy of menus and pa-rameters for the EconoMi$er® X system.

The Menus in display order are:• STATUS• SETPOINTS• SYSTEM SETUP• ADVANCED SETUP• CHECKOUT• ALARMS

NOTE: Some parameters in the menus use the letters MAor MAT, indicating a mixed air temperature sensor locationbefore the cooling coil. This unit application has the controlsensor located after the cooling coil, in the fan section,where it is designated as (Cooling) Supply Air Temperatureor SAT sensor.Setup and ConfigurationBefore being placed into service, the W7220 Economizermodule must be set up and configured for the installedsystem.

The setup process uses a hierarchical menu structure thatis easy to use. Press the ▲ and ▼ arrow buttons to moveforward and backward through the menus and press thebutton to select and confirm setup item changes.Time-Out and ScreensaverWhen no buttons have been pressed for 10 minutes, theLCD displays a screen saver, which cycles through the Sta-tus items. Each Status items displays in turn and cycles tothe next item after 5 seconds.

IMPORTANT: Table 8 illustrates the complete hier-archy. Your menu parameters may be differentdepending on your configuration.

For example if you do not have a DCV (CO2) sensor,then none of the DCV parameters appear and onlyMIN POS will display. If you have a CO2 sensor, theDCV MIN and DCV MAX will appear.

IMPORTANT: During setup, the economizer mod-ule is live at all times.

Table 8 — W7220 Menu Structure*

MENU PARAMETERPARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT†

NOTES

STATUS

ECONO AVAIL NO YES/NO FIRST STAGE COOLING DEMAND (Y1–IN)YES = economizing available; the system can use outside air for free cooling when required

ECONOMIZING NO YES/NO FIRST STAGE COOLING RELAY OUTPUTYES = outside air being used for 1 stage cooling

OCCUPIED NO YES/NO OCCUPIEDYES = OCC signal received from space thermostat or unitary controllerYES = 24 Vac on terminal OCCNO = 0 Vac on terminal OCC

HEAT PUMP N/A** COOLHEAT

HEAT PUMP MODEDisplays COOL or HEAT when system is set to heat pump(Non-conventional)

COOL Y1—IN OFF ON/OFF FIRST STAGE COOLING DEMAND (Y1-IN)Y1–I signal from space thermostat or unitary controller for cooling stage 1.ON = 24 Vac on terminal Y1–IOFF = 0 Vac on terminal Y1–I

COOL Y1—OUT OFF ON/OFF FIRST STAGE COOLING RELAY OUTPUTCool stage 1 Relay Output to stage 1 mechanical cooling (Y1–OUT terminal)

COOL Y2—IN OFF ON/OFF SECOND STAGE COOLING DEMAND (Y2–IN)Y2–I signal from space thermostat our unitary controller for sec-ond stage cooling.ON = 24 Vac on terminal Y2–IOFF = 0 Vac on terminal Y2–I

COOL Y2—OUT OFF ON/OFF SECOND STAGE COOLING RELAY OUTPUTCool Stage 2 Relay Output to mechanical cooling (Y2–OUT terminal)

MA TEMP _ _ . _ F 0 to 140 F SUPPLY AIR TEMPERATURE, Cooling ModeDisplays value of measured mixed air from MAT sensor.Displays _ _ . _ F if not connected, short or out-of-range.


STATUS (CONT)

DA TEMP _ _ . _ F 0 to 140 F DISCHARGE AIR TEMPERATURE, after Heating sectionDisplays when Discharge Air sensor is connected and displays measured discharge temperature.Displays _ _ . _F if sensor sends invalid value, if not connected, short or out-of-range.

OA TEMP _ _ . _ F -40 to 140 F OUTSIDE AIR TEMPDisplays measured value of outdoor air temperature.Displays _ _ . _F if sensor sends invalid value, short or out-of-range.

OA HUM _ _ % 0 to 100% OUTSIDE AIR RELATIVE HUMIDITYDisplays measured value of outdoor humidity from OA sensor.Displays _ _% if not connected short, or out-of-range.

RA TEMP _ _ . _ F 0 to 140 F RETURN AIR TEMPERATUREDisplays measured value of return air temperature from RAT sensor.Displays _ _ . _ F if sensor sends invalid value, if not connected, short or out-of-range

RA HUM _ _ % 0 to 100% RETURN AIR RELATIVE HUMIDITYDisplays measured value of return air humidity from RA sensor.Displays _ _% if sensor sends invalid value, if not connected, short or out-of-range

IN CO2 _ _ _ ppm 0 to 2000 ppm SPACE/RETURN AIR CO2Displays value of measured CO2 from CO2 sensor. Invalid if not connected, short or out-of-range

DCV STATUS N/A ON/OFF DEMAND CONTROLLED VENTILATION STATUSDisplays ON if above setpoint and OFF if below setpoint, and ONLY if a CO2 sensor is connected.

DAMPER OUT 2.0v 2.0 to 10.0v Displays voltage output to the damper actuator.ACT POS N/A 0 to 100% Displays actual position of outdoor air damper actuatorACT COUNT N/A 1 to 65535 Displays number of times actuator has cycled.

1 cycles equals 180 deg. of actuator movement in any direction.ACTUATOR N/A OK/Alarm (on

Alarm menu)Displays ERROR if voltage or torque is below actuator range.

EXH1 OUT OFF ON/OFF EXHAUST STAGE 1 RELAY OUTPUTOutput of EXH1 terminal:ON = relay closedOFF = relay open

EXH2 OUT OFF ON/OFF EXHAUST STAGE 2 RELAY OUTPUTOutput of AUX terminal; displays only if AUX = EXH2

ERV OFF ON/OFF ENERGY RECOVERY VENTILATOROutput of AUX terminal; displays only if AUX = ERV

MECH COOL ONorHEAT STAGES ON

0 0, 1, or 2 Displays stage of mechanical cooling that is active.

Displays the stage of heat pymp heating that is active.FAN SPEED N/A LOW or HIGH SUPPLY FAN SPEED

Displays speed setting of fan on a 2-speed fan unit.W (HEAT ON) N/A ON/OFF HEAT DEMAND STATUS

Displays status of heat demand on a 2-speed fan unit.

Table 8 — W7220 Menu Structure* (cont)


DEFAULT VALUE


NOTES


SETPOINTS

MAT SET 53F 38 to 65 F; incre-ment by 1

SUPPLY AIR SETPOINTSetpoint determines where the economizer will modulate the OA damper to maintain the mixed air temperature.

LOW T LOCK 32F -45 to 80 F;increment by 1

COMPRESSOR LOW TEMPERATURE LOCKOUTSetpoint determines outdoor temperature when the mechanical cooling cannot be turned on. Commonly referred to as the Com-pressor lockout.

DRYBLB SET 63F 48 to 80 F; incre-ment by 1

OA DRY BULB TEMPERATURE CHANGEOVER SETPOINTSetpoint determines where the economizer will assume outdoor air temperature is good for free cooling; e.g.; at 63 F unit will economize at 62 F and below and not economize at 64 F and above. There is a 2 F deadband.

ENTH CURVE ES3 ES1,ES2,ES3,ES4, or ES5

ENTHALPY CHANGEOVER CURVEEnthalpy boundary “curves” for economizing using single enthalpy.

DCV SET 1100ppm 500 to 2000 ppm; increment by 100

DEMAND CONTROLLED VENTILATIONDisplays only if CO2 sensor is connected. Setpoint for Demand Control Ventilation of space. Above the setpoint, the OA dampers will modulate open to bring in additional OA to maintain a space ppm level below the setpoint.

MIN POS 2.8 V 2 to 10 Vdc VENTILATION MINIMUM POSITIONDisplays ONLY if a CO2 sensor is NOT connected.

VENTMAX With 2-speed fan units

VENTMAX L (low speed fan) and VENTMAX H

(high speed fan) settings are required

2.8 V

2 to 10 Vdc

DCV MAXIMUM DAMPER POSITIONDisplays only if a CO2 sensor is connected. Used for Vbz (venti-lation max cfm) setpoint. Displays 2 to 10 V if <3 sensors (RA,OA, and MA). In AUTO mode dampers controlled by CFM.

100 to 9990 cfm; increment

by 10

If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.

2 to 10 VdcWith 2-speed fan units VENT L (low speed fan) and MIN POS H (high speed fan) settings are required. Default for VENTMAX L is 3.2V and VENTMAX H is 2.8V

VENTMIN With 2-speed

fan units VENTMIN L (low speed fan) and VENTMIN

H (high speed fan) set

2.25 V

2 to 10 Vdc or 100 to 9990 cfm incre-

ment by 10

DCV MINIMUM DAMPER POSITIONDisplays only if a CO2 sensor is connected. Used for Ba (ventila-tion min cfm) setpoint. Displays 2 to 10 V if <3 sensors (RA, OA, and MA). Va is only set if DCV is used. This is the ventilation for less than maximum occupancy of the space. In AUTO mode dampers controlled by CFM.

100 to 9990 cfm; increment

by 10

If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.

2 to 10 VdcWith 2-speed fan units VENTMIN L (low speed fan) and MIN POS H (high speed fan) settings are required. Default for VENT-MIN L is 3.2V and VENTMIN H is 2.8V

ERV OAT SP†† 32°F 0 to 50 F; incre-ment by 1

ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR TEMPERATURE SETPOINTOnly when AUX1 O = ERV

EXH1 SET With 2-speed fan units Exh1 L (low speed fan) and Exh1 H (high speed fan) settings are required

50% 0 to 100%;incre-ment by 1

EXHAUST FAN STAGE 1 SETPOINTSetpoint for OA damper position when exhaust fan 1 is powered by the economizer.With 2-speed fan units Exh1 L (low speed fan) and Exh1 H (high speed fan) settings are required. Default for Exh1 L is 65% and Exh1 H is 50%

EXH2 SET With 2-speed fan units Exh2 L (low speed fan) and Exh2 H (high speed fan) settings are required

75% 0 to 100%; incre-ment by 1

EXHAUST FAN STAGE 2 SETPOINTSetpoint for OA damper position when exhaust fan 2 is powered by the economizer. Only used when AUX1 O is set to EHX2.With 2-speed fan units Exh2 L (low speed fan) and Exh2 H (high speed fan) settings are required. Default for Exh2 L is 80% and Exh2 H is 75%



DEFAULT VALUE


NOTES


SYSTEM SETUP

INSTALL 01/01/10 N/A Display order = MM/DD/YYSetting order = DD, MM, then YY.

UNITS DEG F F or C Sets economizer controller in degrees Fahrenheit or CelsiusEQUIPMENT CONV Conventional or HP CONV = conventional;

HP O/B = Enable Heat Pump mode. Use AUX2 I for Heat Pump input from thermostat or controller.See Menu Note 4.

AUX2 IN W SD/W or HP(O)/HP(B)

In CONV mode:SD + Enables configuration of shutdown (default);W = Informs controller that system is in heating mode. NOTE: If using 2-speed fan mode, you must program CONV mode for W. Shutdown is not available in 2-speed fan mode. See Menu Note 4.In HP O/B mode: HP(O) = energize heat pump on Cool (default); HP(B) = energize heat pump on heat.

FAN SPEED 2 speed 1 speed/2 speed Sets the economizer controller for operation of 1 speed or 2 speed supply fan.NOTE: 2-speed fan option also needs Heat (W1) programmed in AUX 2 In. See Menu Note 4.

FAN CFM 5000cfm 100 to 15000 cfm; increment by 100

UNIT DESIGN AIRFLOW (CFM)Enter only if using DCVAL ENA = AUTOThe value is found on the nameplate label for the specific unit.

AUX1 OUT NONE NONEERVEXH2SYS

Select OUTPUT for AUX1 O relay• NONE = not configured (output is not used)• ERV = Energy Recovery Ventilator††

• EXH2 = second damper position relay closure for second exhaust fan• SYS = use output as an alarm signal

OCC INPUT INPUT or ALWAYS OCCUPIED MODE BY EXTERNAL SIGNALWhen using a setback thermostat with occupancy out (24 vac), the 24 vac is input “INPUT” to the OCC terminal. If no occupancy output from the thermostat then change program to “ALWAYS” OR add a jumper from terminal R to OCC terminal.

FACTORY DEFAULT NO NO or YES Resets all set points to factory defaults when set to YES. LCD will briefly flash YES and change to NO but all parameters will change to the factory default values.NOTE: RECHECK AUX2 IN and FANTYPE for required 2-speed values.

ADVANCED SETUP

MA LO SET 45°F 35 to 55 F; Incremented by 10

SUPPLY AIR TEMPERATURE LOW LIMITTemperature to achieve Freeze Protection (close damper and alarm if temperature falls below setup value).

FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITIONDamper position when freeze protection is active (closed or MIN POS).

CO2 ZERO 0ppm 0 to 500 ppm; Increment by 10

CO2 ppm level to match CO2 sensor start level.

CO2 SPAN 2000ppm 1000 to 3000 ppm; Increment by 10

CO2 ppm span to match CO2 sensor.

STG3 DLY 2.0h 0 min, 5 min, 15 min, then 15 min intervals. Up to 4 hrs or OFF

COOLING STAGE 3 DELAYDelay after stage 2 cool has been active. Turns on 2nd stage of cooling when economizer is 1st stage and mechanical cooling is 2nd stage. Allows three stages of cooling, 1 economizer and 2 mechanical.OFF = no Stage 3 cooling

SD DMPR POS CLO CLO or OPN Indicates shutdown signal from space thermostat or unitary con-troller. When controller receives 24 Vac input on the SD terminal in conventional mode, the OA damper will open if programmed for OPN and OA damper will close if programmed for CLO. All other controls, e.g., fans, etc. will shut off.

DA LO ALM 45 F (7 C) 35 to 65 F; (2 to 18 C) Incremented by 5 deg.

Used for alarm for when the DA air temperature is too low. Set lower range of alarm, below this temperature the alarm will show on the display.

DA HI ALM 80 F (27 C) 70 to 180 F; (21 to 82 C) Incremented by 5 deg.

Used for alarm for when the DA air temperature is too high. Set upper range of alarm, above this temperature the alarm will show on the display.

DCVCAL ENA MAN MAN (manual) AUTO

Turns on the DCV automatic control of the dampers. Resets ven-tilation based on the RA, OA, and MA sensor conditions. Requires all 3 RA, OA, and MA sensors.



DEFAULT VALUE


NOTES


ADVANCED SETUP (CONT)

MAT T CAL 0.0°F ±2.5 F SUPPLY AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration tempera-ture sensor.

OAS T CAL 0.0°F ±2.5 F OUTSIDE AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration tempera-ture sensor.

OA H CAL 0% RH ±10% RH OUTSIDE AIR HUMIDITY CALIBRATIONAllows for operator to adjust for an out of calibration humidity sensor.

RA T CAL 0.0°F ±2.5 F RETURN AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration tempera-ture sensor.

RA H CAL 0% RH ±10% RH RETURN AIR HUMIDITY CALIBRATIONAllows for operator to adjust for an out of calibration humidity sensor.

DA T CAL 0.0°F ±2.5 F DISCHARGE AIR TEMPERATURE CALIBRATIONAllows for the operator to adjust for an out of calibration tempera-ture sensor.

2SP FAN DELAY 5 Minutes 0 to 20 minutes in 1 minute increments

TIME DELAY ON SECOND STAGE ECONOMIZINGWhen in economizing mode this is the delay for the high speed fan to try to satisfy the call for second stage cooling before the first stage mechanical cooling is enabled.

CHECKOUT

DAMPER MINIMUM POSITION

N/A N/A The checkout for the damper minimum position is based on the system.

DAMPER OPEN N/A N/A Position damper to the full open position.Exhaust fan contacts enable during the DAMPER OPEN test. Make sure you pause in the mode to allow exhaust contacts to energize due to the delay in the system.

DAMPER CLOSE N/A N/A Positions damper to the fully closed positionCONNECT Y1–O N/A N/A Closes the Y1-O relay (Y1-O)CONNECT Y2–O N/A N/A Closes the Y2-O relay (Y2-O)CONNECT AUX1-O N/A N/A Energizes the AUX output. If Aux setting is:

• NONE — not action taken• ERV — 24 Vac out. Turns on or signals an ERV that the condi-tions are not good for economizing but are for ERV operation.††

• SYS — 24 Vac out. Issues a system alarmCONNECT EXH1 N/A N/A Closes the power exhaust fan 2 relay (EXH1)

ALARMS

Alarms display only when they are active. The menu title “ALARMS(#)” includes the number of active alarms in parenthesis ( ). When using SYLK bus sensors, “SYLK” will appear on the screen, and when using 20k OA temperature sensors, “SENS T” will

appear on the screenMA T SENS ERR N/A N/A SUPPLY AIR TEMPERATURE SENSOR ERROR

Mixed air sensor has failed or become disconnected - check wir-ing then replace sensor if the alarm continues.

CO2 SENS ERR N/A N/A CO2 SENSOR ERRORCO2 sensor has failed, gone out of range or become discon-nected - check wiring then replace sensor if the alarm continues.

OA SYLK T ERR N/A N/A OUTSIDE AIR S-BUS SENSOR ERROROutdoor air enthalpy sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues.

OA SYLK H ERR N/A N/A

RA SYLK T ERR N/A N/A RETURN AIR S-BUS SENSOR ERRORReturn air enthalpy sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues.

RA SYLK H ERR N/A N/A

DA SYLK T ERR N/A N/A DISCHARGE AIR S-BUS SENSOR ERRORDischarge air sensor has failed or become disconnected - check wiring then replace sensor if the alarm continues.

OA SENS T ERR N/A N/A OUTSIDE AIR TEMPERATURE SENSOR ERROROutdoor air temperature sensor has failed or become discon-nected - check wiring then replace if the alarm continues.

ACT ERROR N/A N/A ACTUATOR ERRORActuator has failed or become disconnected - check for stall, over voltage, under voltage and actuator count. Replace actuator if damper is movable and supply voltage is between 21.6 V and 26.4 V. Check actuator count on STATUS menu.

FREEZE ALARM N/A N/A Check if outdoor temperature is below the LOW Temp Lockout on setpoint menu. Check if Mixed air temperature on STATUS menu is below the Lo Setpoint on Advanced menu. When conditions are back in normal range then the alarm will go away.



DEFAULT VALUE


NOTES


LEGEND

* Table illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration. For example if you do not have a DCV (CO2) sensor, then none of the DCV parameters ap-pear.

† When values are displayed, pressing and holding the or button causes the display to automatically increment.

** N/A = Not Applicable.†† ERV Operation: When in cooling mode AND the conditions are NOT

OK for economizing - the ERV terminal will be energized. In the Heat-ing mode, the ERV terminal will be energized when the OA is below the ERV OAT setpoint in the setpoint menu.

NOTES:1. STATUS —> OCCUPIED — The factory-standard Occupancy sig-

nal originates with a thermostat or other controller call for indoorfan operation at UCB terminal G. This signal passes through theUnit Control Board’s OCCUPANCY jumper to the ECONO connec-tor and to the W7220’s OCC input terminal.An external timeclockor relay is required to implement an Occupancy schedule on theeconomizer damper position.

2. STATUS —> MA TEMP, SETPOINTS —> MAT SET — TheW7220 menu parameters and labels include designations MA,MAT and Mixed Air for the economizer cooling control sensor. Onthese rooftop units, the economizer control sensor is located down-stream of the evaporator/indoor coil in the supply fan sectionwhere this sensor is designated as Supply Air Temperature (SAT)sensor.

3. SETPOINTS —> DRYBLB SET — This point is not displayed if aReturn Air (differential) temperature sensor or an Outdoor Airenthalpy sensor is connected.

4. SYSTEM SETUP parameters must be configured as noted for 2-Speed unit operation:EQUIPMENT = CONVAUX2 I = WFAN SPEED = 2SPEED

For damper minimum position settings and checkout menureadings, see Table 9.

SEQUENCE OF OPERATION

See Tables 10-17 for dry bulb and enthalpy sequenceof operation.

ALARMS (CONT)

SHUTDOWN ACTIVE N/A N/A AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to AUX2 IN terminal.

DMP CAL RUNNING N/A N/A DAMPER CALIBRATION ROUTINE RUNNINGIf DCV Auto enable has been programmed, when the W7220 is completing a calibration on the dampers, this alarm will display. Wait until the calibration is completed and the alarm will go away. Must have OA, MA and RA sensors for DCV calibration; set up in the Advanced setup menu.

DA SENS ALM N/A N/A DISCHARGE AIR TEMPERATURE SENSOR ALARMDischarge air temperature is out of the range set in the ADVANCED SETUP Menu. Check the temperature of the dis-charge air.

SYS ALARM N/A N/A When AUX1-0 is set to SYS and there is any alarm (e.g., failed sensors, etc.), the AUX1-0 terminal has 24 Vac out.

ACT UNDER V N/A N/A ACTUATOR VOLTAGE LOWVoltage received by actuator is above expected range.

ACT OVER V N/A N/A ACTUATOR VOLTAGE HIGHVoltage received by actuator is below expected range.

ACT STALLED N/A N/A ACTUATOR STALLEDActuator stopped before achieving commanded position.



DEFAULT VALUE


NOTES

CLO — Compressor LockoutERV — Energy Recovery VentilatorLCD — Liquid Crystal DisplayMA — Mixed AirMAT — Mixed Air TemperatureN/A — Not ApplicableOA — Outdoor AirOAT — Outdoor Air TemperatureOCC — OccupiedRA — Return AirRAT — Return Air TemperatureRTU — Rooftop UnitSYS — System

Table 9 — Damper Minimum Position Settings and Readings on Checkout Menu

DEMAND CONTROLLED VENTILATION(CO2 SENSOR)

SETPOINTS FAN SPEED CHECKOUT

NO

MIN POS 1 VMAX–HSN/A 1 N/A

MIN POS H 2 VMAX–HSMIN POS L 2 VMAX–LS

YES

VENT MIN 1 VMAX–HSVENT MAX 1 VMAX–HS

VENT MIN H 2 VMAX–HSVENT MAX H 2 VMAX–LSVENT MIN L 2 N/AVENT MAX L 2 N/A


Table 10 — Dry Bulb Operation, No Demand Controlled Ventilation (DCV) (CO2 Sensor) — 1 Speed Fan

*With stage 3 delay (STG3 DLY) in Advanced setup menu, second stage of mechanical cooling Y2-O can be turned on after the delay if the calls for Y1-I and Y2-I have not been satisfied.

Table 11 — Dry Bulb Operation, with Demand Controlled Ventilation (DCV) (CO2 Sensor) — 1 Speed Fan


Table 12 — Enthalpy Operation, No Demand Controlled Ventilation (DCV) (CO2 Sensor) — 1 Speed Fan


DCVOUTSIDE AIR

GOOD TO ECONOMIZE?

Y1-1 Y2-1 FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

None

NoOff Off High 0-v/Off 0-v/Off MIN POS ClosedOn Off High 24-v/On 0-v/Off MIN POS ClosedOn On High 24-v/On 24-v/On MIN POS Closed

YesOff Off High 0-v/Off 0-v/Off MIN POS ClosedOn Off High 0-v/Off 0-v/Off MIN POS to Full-Open Closed to Full-OpenOn On High 24-v/On 24-v/Off* MIN POS to Full-Open Closed to Full-Open

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


Below CO2 Set

NoOff Off High 0-v/Off 0-v/Off VENTMIN ClosedOn Off High 24-v/On 0-v/Off VENTMIN ClosedOn On High 24-v/On 24-v/On VENTMIN Closed

YesOff Off High 0-v/Off 0-v/Off VENTMIN ClosedOn Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open

Above CO2 Set

NoOff Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX ClosedOn Off High 24-v/On 0-v/Off VENTMIN to VENTMAX ClosedOn On High 24-v/On 24-v/On VENTMIN to VENTMAX Closed

YesOff Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX ClosedOn Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off* VENTMIN to Full-Open Closed to Full-Open

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


None

NoOff Off High 0-v/Off 0-v/Off MIN POS ClosedOn Off High 24-v/On 0-v/Off MIN POS ClosedOn On High 24-v/On 24-v/On MIN POS Closed

YesOff Off High 0-v/Off 0-v/Off MIN POS ClosedOn Off High 0-v/Off 0-v/Off MIN POS to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off* MIN POS to Full-Open Closed to Full-Open


Table 13 — Enthalpy Operation, with Demand Controlled Ventilation (DCV) (CO2 Sensor) — 1 Speed Fan

*With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for second stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

†With stage 3 delay (STG3 DLY) in Advanced setup menu, second stage of mechanical cooling Y2-O can be turned on after the delay if the calls for Y1-I and Y2-I have not been satisfied.

Table 14 — Dry Bulb Operation, No Demand Controlled Ventilation (DCV) (CO2 Sensor) — 2 Speed Fan



Table 15 — Dry Bulb Operation, with Demand Controlled Ventilation (DCV) (CO2 Sensor) — 2 Speed Fan



DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


Below Set

NoOff Off High 0-v/Off 0-v/Off VENTMIN ClosedOn Off High 24-v/On 0-v/Off VENTMIN ClosedOn On High 24-v/On 24-v/On VENTMIN Closed

YesOff Off High 0-v/Off 0-v/Off VENTMIN ClosedOn Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off† VENTMIN to Full-Open Closed to Full-Open

Above Set

No

Off Off High 0-v/Off 0-v/Off VENTMIN to VENTMAX ClosedOn Off High 24-v/On 0-v/Off VENTMIN L to VENTMAX Closed

On On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed

Yes

Off Off High 0-v/Off 0-v/Off VENTMIN L to VENTMAX ClosedOn Off High 0-v/Off 0-v/Off VENTMIN to Full-Open Closed to Full-Open

On On High DELAY*24-v/On 0-v/Off† VENTMIN to Full-Open Closed to Full-Open

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


None

NoOff Off Low 0-v/Off 0-v/Off MIN POS L ClosedOn Off Low 24-v/On 0-v/Off MIN POS L ClosedOn On High 24-v/On 24-v/On MIN POS H Closed

Yes

Off Off Low 0-v/Off 0-v/Off MIN POS L ClosedOn Off Low 0-v/Off 0-v/Off MIN POS L to Full-Open Closed to Full-Open

On On High DELAY*24-v/On 0-v/Off† MIN POS H to Full-Open Closed to Full-Open

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


Below Set

NoOff Off Low 0-v/Off 0-v/Off VENTMIN L ClosedOn Off Low 24-v/On 0-v/Off VENTMIN L ClosedOn On High 24-v/On 24-v/On VENTMIN H Closed

YesOff Off Low 0-v/Off 0-v/Off VENTMIN L ClosedOn Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off† VENTMIN H to Full-Open Closed to Full-Open

Above Set

NoOff Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX ClosedOn Off Low 24-v/On 0-v/Off VENTMIN L to VENTMAX ClosedOn On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed

Yes

Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX ClosedOn Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open

On On High DELAY*24-v/On 0-v/Off† VENTMIN H to Full-Open Closed to Full-Open


Table 16 — Enthalpy Operation, No Demand Controlled Ventilation (DCV) (CO2 Sensor) — 2 Speed Fan



Table 17 — Enthalpy Operation, with Demand Controlled Ventilation (DCV) (CO2 Sensor) — 2 Speed Fan



ENTHALPY SETTINGS

When the OA temperature, enthalpy and dew point are be-low the respective setpoints, the outdoor air can be used foreconomizing. Figure 40 shows the new single enthalpyboundaries in the W7220. There are 5 boundaries (set-points ES1 through ES5), which are defined by dry bulbtemperature, enthalpy and dew point.Refer to Table 18 for ENTH CURVE setpoint values.The W7220 calculates the enthalpy and dew point using theOA temperature and humidity input from the OA enthalpysensor. When the OA temperature, OA humidity and OAdew point are all below the selected boundary, the econo-mizer sets the economizing mode to YES, economizing isavailable.

When all of the OA conditions are above the selectedboundary, the conditions are not good to economize and themode is set to NO.Figure 40 shows the 5 current boundaries. There is also ahigh limit boundary for differential enthalpy. The high limitboundary is ES1 when there are no stages of mechanicalcooling energized and HL (high limit) when a compressorstage is energized.Table 18 provides the values for each boundary limit.

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


None

NoOff Off Low 0-v/Off 0-v/Off MIN POS L ClosedOn Off Low 24-v/On 0-v/Off MIN POS L ClosedOn On High 24-v/On 24-v/On MIN POS H Closed

Yes

Off Off Low 0-v/Off 0-v/Off MIN POS L ClosedOn Off Low 0-v/Off 0-v/Off MIN POS L to Full-Open Closed to Full-Open

On On High DELAY*24-v/On 0-v/Off† MIN POS H to Full-Open Closed to Full-Open

DCVOUTSIDE AIR

GOOD TO ECONOMIZE?


Below Set

NoOff Off Low 0-v/Off 0-v/Off VENTMIN L ClosedOn Off Low 24-v/On 0-v/Off VENTMIN L ClosedOn On High 24-v/On 24-v/On VENTMIN H Closed

YesOff Off Low 0-v/Off 0-v/Off VENTMIN L ClosedOn Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-OpenOn On High 24-v/On 0-v/Off† VENTMIN H to Full-Open Closed to Full-Open

Above Set

NoOff Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX ClosedOn Off Low 24-v/On 0-v/Off VENTMIN L to VENTMAX ClosedOn On High 24-v/On 24-v/On VENTMIN H to VENTMAX Closed

Yes

Off Off Low 0-v/Off 0-v/Off VENTMIN L to VENTMAX ClosedOn Off Low 0-v/Off 0-v/Off VENTMIN L to Full-Open Closed to Full-Open

On On High DELAY*24-v/On 0-v/Off† VENTMIN H to Full-Open Closed to Full-Open


Fig. 40 — Single Enthalpy Curve and Boundaries

Table 18 — Single Enthalpy and Dual Enthalpy High Limit Curves (EN Units)

TWO-SPEED FAN OPERATION

The W7220 controller has the capability to work with a sys-tem using a 2-speed supply fan. The W7220 does not con-trol the supply directly but uses the input status to determinethe speed of the supply fan (see Table 19) and controls theOA damper to the required position.

Table 19 — W7220 Control, 2-Speed Supply Fan

The W (heating mode) is not controlled by the W7220 but itrequires the status to know where to position the OA damp-er for minimum position for the fan speed.The 2-speed fan delay is available when the system is pro-grammed for 2 speed fan (in the System Setup menu item).The 2-speed fan delay is defaulted to 5 minutes and can bechanged in the Advanced Setup menu item. When the unithas a call for Y1 In and in the free cooling mode and there isa call for Y2 In, the 2-speed fan delay starts and the OAdamper will modulate 100% open, and the supply fanshould be set to high speed by the unit controller.After the delay one of two actions will happen:• The Y2 In call will be satisfied with the damper 100%

open and fan on high speed and the call will turn off,OR

• If the call for additional cooling in the space has notbeen satisfied then the first stage of mechanical cool-ing will be enabled through Y1 Out or Y2 Out.

CHECKOUT

Inspect all wiring connections at the economizer module’sterminals, and verify compliance with the installation wiringdiagrams.For checkout, review the Status of each configured parame-ter and perform the Checkout tests.

NOTE: See “Interface Overview” on page 25 for informationabout menu navigation and use of the keypad.

Power UpAfter the W7220 module is mounted and wired, apply power.Initial Menu Display

On initial start up, Honeywell displays on the first lineand Economizer W7220 on the second line. After a briefpause, the revision of the software appears on the first lineand the second line will be blank.Power Loss (Outage or Brownout)All setpoints and advanced settings are restored after anypower loss or interruption. (All settings are stored in non-vol-atile flash memory.)StatusUse the Status menu (see Table 8) to check the parametervalues for the various devices and sensors configured.NOTE: See “Interface Overview” on page 25 for informationabout menu navigation and use of the keypad.

TEMPERATURE

ENTHALPY

RA

TEM

P ABSO

LUTE

HU

MID

ITY

ECONOMIXING

AVAILABLE

NOT AVAILABLE

ES5 ES4 ES3 ES2 ES1 HL

DUAL ENTHALPYHIGH LIMIT

SINGLE ENTHALPY

P2 (T,RH)

P1(T,RH)

RA HUM (%RH)

ENTHALPYCURVE

TEMPDRY BULB (°F)

TEMPDEWPOINT (°F)

ENTHALPY(btu/lb/da)

POINT P1 POINT P2

TEMP(°F) HUMIDITY (% RH) (°F) HUMIDITY

(% RH)ES1 80.0 60.0 28.0 80.0 36.8 66.3 80.1ES2 75.0 57.0 26.0 75.0 39.6 63.3 80.0ES3 70.0 54.0 24.0 70.0 42.3 59.7 81.4ES4 65.0 51.0 22.0 65.0 44.8 55.7 84.2ES5 60.0 48.0 20.0 60.0 46.9 51.3 88.5HL 86.0 66.0 32.4 86.0 38.9 72.4 80.3

STATE FAN SPEEDOCC LowY1 LowY2 HighW High

WARNING

ELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personal in-jury or death.Before performing service or maintenance operationson unit, turn off main power switch to unit and installlock(s) and lockout tag(s). Ensure electrical service torooftop unit agrees with voltage and amperage listedon the unit rating plate. Unit may have more than onepower switch.If any wiring changes are required, first be sure to re-move power from the economizer module beforestarting work. Pay particular attention to verifying thepower connection (24 Vac).


Checkout Tests Use the Checkout menu (see Table 8) to test the damperoperation and any configured outputs. Only items that areconfigured are shown in the Checkout menu.NOTE: See “Interface Overview” on page 25 for informationabout menu navigation and use of the keypad.

To perform a Checkout test:1. Scroll to the desired test in the Checkout menu using

the ▲ and ▼ buttons.2. Press the (Enter) button to select the item. RUN?

appears.3. Press the (Enter) button to start the test. The unit

pauses, then displays IN PROGRESS. When the testis complete, DONE appears.

4. When all desired parameters have been tested,press the (Menu up) button to end the test.

The Checkout tests can all be performed at the time of in-stallation or at any time during the operation of the systemas a test that the system is operable.

TROUBLESHOOTING

AlarmsThe economizer module provides alarm messages that dis-play on the 2-line LCD.NOTE: Upon power up, the module waits 60 minutes beforechecking for alarms. This allows time for all the configureddevices (e.g. sensors, actuator) to become operational. Theexception is the SAT sensor which will alarm immediately.If one or more alarms are present and there has been nokeypad activity for at least 5 minutes, the Alarms menu dis-plays and cycles through the active alarms. You can alsonavigate to the Alarms menu at any time. Clearing Alarms Once the alarm has been identified and the cause hasbeen removed (e.g. replaced faulty sensor) the alarm canbe cleared from the display.To clear an alarm, perform the following:1. Navigate to the desired alarm.2. Press the (Enter) button. ERASE? displays.3. Press the (Enter) button. ALARM ERASED dis-

plays.4. Press the (Menu up/Exit) button to complete the

action and return to the previous menu.NOTE: If the alarm still exists after clearing it, it is redis-played within 5 seconds.

Smoke DetectorsSmoke detectors are available as factory-installed optionson RAH models. Smoke detectors may be specified forSupply Air only or for Return Air without or with economizer,or in combination of Supply Air and Return Air. Return Airsmoke detectors are arranged for vertical return configura-tions only. All components necessary for operation are fac-tory-provided and mounted. The unit is factory-configuredfor immediate smoke detector shutdown operation; addi-tional wiring or modifications to unit control board may benecessary to complete the unit and smoke detector configu-ration to meet project requirements.Units equipped with factory-optional return-air smoke detec-tors require a relocation of the sensor module at unit instal-lation. See Fig. 41 for the as-shipped location.

Fig. 41 — Return Air Smoke Detector, Shipping Position

COMPLETING INSTALLATION OF RETURN AIRSMOKE SENSOR:

1. Unscrew the two screws holding the return-air smokedetector assembly. See Fig. 42, Step 1. Save thescrews.

2. Turn the assembly 90 degrees and then rotate end toend. Make sure that the elbow fitting is pointingdown. See Fig. 42, Step 2.

3. Screw the sensor and detector plate into its operatingposition using screws from Step 1. See Fig. 42, Step3.

4. Connect the flexible tube on the sampling inlet to thesampling tube on the basepan.

ADDITIONAL APPLICATION DATA

Refer to the application data document “Factory InstalledSmoke Detectors for Small and Medium Rooftop Units 2 to25 Tons” for discussions on additional control features ofthese smoke detectors including multiple unit coordination.

CAUTION

EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in damage toequipment.Be sure to allow enough time for compressor startupand shutdown between checkout tests so that you donot short-cycle the compressors.

RETURN AIR SMOKE DETECTOR

(AS SHIPPED)


Fig. 42 — Completing Installation of Return Air Smoke Sensor

Fig. 43 — Wiring for Optional Economizer

Step 11 — Adjust Factory-Installed Options

SMOKE DETECTOR

Smoke detector(s) will be connected at the Controls Con-nections Board, at terminals marked “Smoke Shutdown”.Remove jumper JMP 3 when ready to energize unit.

ECONOMI$ER® IV OCCUPANCY SWITCH

See Fig. 43 for general EconoMi$er IV wiring. External oc-cupancy control is managed through a connection on theUnit Control Board.If external occupancy control is desired, connect a timeclock or remotely controlled switch (closed for Occupied,open for Unoccupied sequence) at terminals marked OC-CUPANCY. Detach the jumper covering the “Occupancy”terminals on the UCB and then attach the required connec-tions.

Step 12 — Install Accessories, As RequiredAvailable accessories include:• Roof Curb• Thru-base connection kit (must be installed before

unit is set on curb)• Manual outside air damper• Two-position motorized outside air damper• Economizer (with control and integrated barometric

relief)• Winter start kit• Power exhaust• Outdoor enthalpy sensor• Differential enthalpy sensor• Electric heaters

STEP 1 STEP 2 STEP 3


• Single point kits• Thermostat/sensors• CO2 sensor• Louvered hail guard• Phase monitor control

Refer to separate installation instructions for information oninstalling these accessories.

Step 13 — Check Belt TensionMeasure the belt span length as shown in Fig. 44. Calculatethe required deflection by multiplying the belt span length by1/64. For example, if the belt span length is 32 inches: 32 x 1/64 = 1/2 inch deflection.

BELT FORCE — DEFLECTION METHOD

Check the belt tension with a spring-force belt force deflec-tion gauge.

1. Place a straightedge along the belt between the twopulleys. Measure the distance between the motorshaft and the blower shaft.

2. Set the tension gauge to the desired tension (seeTable 1 in Fig. 44). Place the large O-ring at thatpoint.

3. Press the tension checker downward on the belt untilthe large O-ring is at the bottom of the straightedge.

4. Adjust the belt tension as needed.Adjust belt tension by loosing the motor mounting plate frontbolts and rear bolt (see Fig. 45) and sliding the plate to-wards the fan (to reduce tension) or away from the fan (toincrease tension). Ensure the blower shaft and motor shaftare parallel to each other (pulleys aligned). Tighten all boltssecurely when finished.

Fig. 44 — V-Belt Force Label


Fig. 45 — Belt Drive Motor Mounting

BLOWER PULLEY

V-BELT

MOTOR PULLEY

MOTOR

MOTOR MOUNTINGPLATE

MOUNTINGBOLTS (4)

Specifications are subject to change without notice. 513 01 3611 02

Copyright 2018 International Comfort ProductsLewisburg, TN 37091 USA Replaces: 513 01 3611 01

513 01 3611 02 Specifications are subject to change without notice. CL-1

START-UP CHECKLIST FOR RAH072-120 SINGLE PACKAGE ROOFTOPELECTRIC COOLING UNIT

(REMOVE AND USE FOR JOB FILE)

I. PRELIMINARY INFORMATIONMODEL NO. ____________________________________________

JOB NAME _____________________________________________

SERIAL NO. ____________________________________________

ADDRESS _____________________________________________

START-UP DATE ________________________________________

TECHNICIAN NAME ______________________________________

ADDITIONAL ACCESSORIES

_____________________________________________________________________________________________________

II. PRE-START-UPVerify that all packaging materials have been removed from unit (Y/N) _____Verify installation of outdoor air hood (Y/N) _____Verify that condensate connection is installed per instructions (Y/N) _____Verify that all electrical connections and terminals are tight (Y/N) _____Check that indoor-air filters are clean and in place (Y/N) _____Check that outdoor air inlet screens are in place (Y/N) _____Verify that unit is level (Y/N) _____Check fan wheels and propeller for location in housing/orifice and verify setscrew is tight (Y/N) _____Verify that fan sheaves are aligned and belts are properly tensioned (Y/N) _____Verify that scroll compressors are rotating in the correct direction (Y/N) _____Verify installation of thermostat (Y/N) _____

III. START-UPELECTRICALSupply Voltage L1-L2_____________ L2-L3_____________ L3-L1_____________Compressor Amps 1 L1 _____________ L2 _____________ L3 _____________Compressor Amps 2 L1 _____________ L2 _____________ L3 _____________Supply Fan Amps L1 _____________ L2 _____________ L3 _____________

TEMPERATURESOutdoor-air Temperature _____________ °F DB (Dry Bulb)Return-air Temperature _____________ °F DB _____________ °F Wb (Wet Bulb) Cooling Supply Air Temperature _____________ °F

NOTE: To avoid injury to personnel and damage to equipment orproperty when completing the procedures listed in this start-upchecklist, use good judgment, follow safe practices, and adhereto the safety considerations/information as outlined in preced-ing sections of this Installation Instruction document.

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- --

- -

- -

- -

- -

- -

- -

- -

- -

- -

-

CU

T A

LON

G D

OT

TE

D L

INE

CU

T A

LON

G D

OT

TE

D L

INE

CL-2 Specifications are subject to change without notice. 12-18 513 01 3611 02

Copyright 2018 International Comfort ProductsLewisburg, TN 37091 USA Replaces: 513 01 3611 01

PRESSURESRefrigerant Suction CIRCUIT A _____________ PSIG

CIRCUIT B _____________ PSIGRefrigerant Discharge CIRCUIT A _____________ PSIG

CIRCUIT B _____________ PSIGVerify Refrigerant Charge using Charging Charts (Y/N) _____

GENERALEconomizer minimum vent and changeover settings to job requirements (if equipped) (Y/N) _____Verify smoke detector unit shutdown by utilizing magnet test (Y/N) _____

IV. HOT GAS RE-HEAT START-UPSTEPS

1. Check CTB for jumper 5, 6, 7 (Jumper 5, 6, 7 must be cut and open) (Y/N) _____2. Open humidistat contacts (Y/N) _____3. Start unit In cooling (Close Y1) (Y/N) _____

OBSERVE AND RECORDA. Suction pressure _______________ PSIGB. Discharge pressure _______________ PSIGC. Entering air temperature _______________ ° FD. Liquid line temperature at outlet or reheat coil _______________ ° FE. Confirm correct rotation for compressor (Y/N) _____F. Check for correct ramp-up of outdoor fan motor as condenser coil warms (Y/N) _____

4. Check unit charge per charging chart (Y/N) _____5. Switch unit to high-latent mode (sub-cooler) by closing humidistat with Y1 closed (Y/N) _____

OBSERVEA. Reduction in suction pressure (5 to 7 psi expected) (Y/N) _____B. Discharge pressure unchanged (Y/N) _____C. Liquid temperature drops to 50 to 55°F range (Y/N) _____D. Liquid solenoid valve (LSV) energized (valve closes) (Y/N) _____

6. Switch unit to dehumid (reheat) by opening Y1 (Y/N) _____

OBSERVEA. Suction pressure increases to normal cooling levelB. Discharge pressure decreases (35 to 50 psi)C. Liquid temperature returns to normal cooling levelD. LSV solenoid energized (valve closes)E. Discharge solenoid valve (DSV) energized, valve opens

7. With unit in dehumid mode close W1 compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____

8. Open W1 restore unit to dehumid mode (Y/N) _____9. Open humidistat input compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____

10. Restore set-points for thermostat and humidistat (Y/N) _____

REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS

r-410a single-package rooftop electric cooling unit installation … · 2020. 7. 30. · fig. 3 —...

Documents