installation instruction supersedes: 515.16--n3y...

INSTALLATION INSTRUCTION

OUTDOORSPLIT--SYSTEM HEAT PUMP

1.5 to 5 TONS515.16--N3Y (999)Supersedes: 515.16--N3Y (1098)

035--15727--403

MODELS E*RA, E*RC and E*RE10, 12 AND 14 SEER

GENERALThese outdoor heat pump units are designed to be con-nected to a matching UPG indoor coil with sweat connec-tion lines. They are equipped with a solid core filter--drierlocated in the discharge line and a high pressure switch.14 SEER models are also equipped with a high tempera-ture switch. The units are factory charged with refriger-ant for a matching indoor coil plus 15 feet of field suppliedline. The outdoor unit is designed to be placed near theperimeter of the home, typically alongside or at the backof the home, remote from the indoor coil.

The outdoor unit has been factory run--tested and allcomponents of the system are ready for easy, immediateinstallation.

INSPECTIONCheck the unit thoroughly for shipping damage, Unusu-ally rough handling during shipment may loosen fan mo-tors, compressors, or other components. Be sure thatthe unit is ready to operate before installing it. If there isdamage, file a claim with the shipper. See Local Distribu-tor for more information.

REFERENCEUse this instruction in conjunction with the instructionsfor the appropriate indoor unit, air moving system and ac-cessories.

Installer should pay particular attention to the wordsNOTE, CAUTION and WARNING.

NOTES are intended to clarify or make the installationeasier.

CAUTIONS identify procedures which, if not followedcarefully, could result in personal injury, property dam-age or equipment damage.

WARNINGS are given to alert the installer that severepersonal injury, death or equipment damage may result ifinstallation procedures are not followed properly.

Product CategoryE = Heat Pump, Outdoor Unit

Product Generation1 = 1st Generation

Product IdentifierRA = 10 Seer Split--System Heat PumpRC = 12 Seer Split--System Heat PumpRE= 14 Seer Split--System Heat Pump

Nominal Cooling Capacity018 = 18,000 BTUH024 = 24,000 BTUH030 = 30,000 BTUH036 = 36,000 BTUH042 = 42,000 BTUH048 = 48,000 BTUH060 = 60,000 BTUH

Refrigerant Line ConnectionsS = Sweat connect

E 1 RA 036 S 06

Voltage Code06 = 208/230 -- 1 -- 6078 = 208/230 -- 1 -- 50

NOMENCLATURE

LIMITATIONS

The manufacturer is not responsible for the perfor-mance of a mismatched system. The outdoor unitmust be installed with a compatible indoor unit asdesignated in the specification data or in the Direc-tory of Certified Unitary Heat Pumps published bythe Air Conditioning and Refrigeration Institute. Us-ing unmatched components may not only affect theperformance of the system, but may also void thewarranty of the equipment.

Do not install any coil in a furnace which is to be op-erated during the heating season without attachingthe refrigerant lines to the coil. Allowing the coilcharge to enter the refrigerant lines prevents exces-sive refrigerant pressure build--up and possible coildamage.

The unit should be installed in accordance with all nation-al and local codes and regulations which govern theinstallation of this type of equipment. In lieu of localcodes, the equipment should be installed in accordancewith National Electric Code, and in accordance with therecommendations made by the National Board of FireUnderwriters.

2 Unitary Products Group

Limitations for the indoor unit, coil and appropriate ac-cessories must also be observed.

The outdoor unit must not be installed with any duct workin the air stream. The outdoor fan is the propeller typeand is not designed to operate against any additional ex-ternal static pressure.

The maximum and minimum conditions for operationmust be observed to assure a system that will give maxi-mum performance with minimum service.

Table 1 -- Application Limitations

Ambient Air Temperatureon Outdoor Coil

Air Temperature onIndoor Coil

Min._DB Max. _DB Min. Max.

Cool Heat Cool Heat WBCool

_DBHeat

WBCool

_DBHeat

50 --10* 120 70 57 50** 72 80* If ambient will be below this. Accessory Kit 2LT06700224 must be installed to cutoffheat pump.** Operation below this temperature is permissible for a short period of time whenrequired to bring the heating area up to 50˚ F.

CHECK ELECTRICAL POWER SUPPLYThe electrical power should be checked to determine ifadequate power is available, and near constant voltagecan be maintained. If there is any question concerningthe power supply, contact the local power company forcorrections; otherwise, unsatisfactory performance mayresult.

SELECTING THE BEST HEAT PUMP LOCATIONSeveral important factors must be considered before se-lecting the site for the outdoor unit:

G Distance to indoor coilG Proximity to the structureG Proximity to vents and exhaust systemsG Ability to serviceG Sound transmissionG Air circulationG Wind directionG Relationship between structure, sun, and unitG Distance from power sourceG Defrost drainageG Water drainageG Average winter snow depthG Local codes

Locate the outdoor unit near enough to the indoor coil vi-cinity to eliminate lengthy refrigerant line runs. Do not lo-cate the outdoor unit so it discharges air under eaves orgutters. Rain or snow melt--off should not be able to runoff a roof and down upon the unit. Be sure vents are notlocated upwind from the outdoor unit.

A minimum clearance of 18 inches is required for service atthe control panel and compressor compartments access.A 10 inch clearance is required for the air inlet to the out-door coil around the perimeter of the unit. The air dischargeof the unit requires a 60 inch clearance between the top ofthe unit and any obstruction. See Figure 1.

The length of the refrigerant tubing, between the outdoorunit and indoor coil, should be as short as possible toavoid capacity and efficiency loss. Excessive spacing ofthe outdoor unit from the home can lead to the refrigerantlines being restricted by trampling or by being puncturedby lawn mowers. Locate the outdoor unit away from bed-room windows or other rooms where sound might be ob-jectionable.

Adverse effects of prevailing winds, blowing snow orsleet onto the outdoor coil can be eliminated by placingthe outdoor unit where the wind does not blow across theunit. Trees, shrubs, corners of buildings and fencesstanding off from the coil can reduce capacity loss due towind chill effect.

Provide ample clearance from shrubs to allow adequateair to pass across the outdoor coil without leaves orbranches being pulled into the coil. The outdoor unit maynever go into the defrost cycle, even with minor frostbuild up, during the daytime in some areas of the UnitedStates if it is placed on the south side of the residencewith no shade. However, the heat pump may lose someefficiency at the south side location with no shade duringthe summer while trying to cool the residence.

Consideration should be given to the distance and rout-ing of electrical service that would have to be run to con-nect the outdoor unit.

It is recommended the outdoor unit be mounted upon asolid base that will not shift or settle. Top of base shouldbe two inches above grade. This allows enough heightfor normal defrost ice build up below the unit in freezingweather. Thought should be given to water drainageaway from the outdoor unit in summer and when the de-frost ice melts on warmer winter days. Drain holes in thebase pan must be kept clear.

In areas where snowfall is significant, the height of theunit base above grade should be two to three incheshigher than the anticipated snowfall. This clearance is re-quired to provide ample drainage during the defrosting ofthe outdoor coil. Soil grading around the heat pumpshould provide drainage away from the unit to preventslippery conditions that may cause personal injury. SeeFigure 2.

3Unitary Products Group

FIGURE 1 -- OUTDOOR UNIT LOCATION

18” SERVICEACCESS CLEARANCE

60” OVERHEADCLEARANCE

10” CLEARANCECOIL AREA

WEATHERPROOFDISCONNECTSWITCH

THERMOSTATTO FURNACE OR AR HANDLERTERMINAL BLOCK

NEC CLASS 1 WIRING

NEC CLASS 2 WIRING

TO INDOOR COIL

SEAL OPENING(S) WITH PERMAGUMOR EQUIVALENT

CONTROL ACCESS PANEL

NOTE: ALL OUTDOOR WIRING MUSTBE WEATHERPROOF

INSTALLATIONOUTDOOR UNIT

After the site has been selected, a solid base pad that willnot shift or settle should be provided. The base padshould not come in contact with the foundation or side ofthe structure because sound may be transmitted to theresidence. The top of the pad should be at least two inch-es above grade to give sufficient height for defrost icebuild up during freezing winter temperatures. See Figure2. The pad should be located far enough away from thestructure so the outdoor unit is not closer than its mini-mum distances. See Figure 1. Set the outdoor unit uponthe pad with care to avoid damage.

FIGURE 2 -- SNOW AND ICE CONSIDERATIONS

��

BOTTOM OF COIL SHOULDBE HIGHER THAN AVERAGESNOWFALL FOR THE AREA

DEFROST ICE BUILD--UPIN FREEZING WINTERTEMPERATURE

Do not remove the protective caps or plugs from theunit refrigerant connections until the refrigerantlines are run and ready for final connection. If thisprocedure is not observed, dirt and other particleswill get into the system and plug various orifices andsmall tubes.

DISCHARGE LINE FILTER--DRIERThe 10, 12, and 14 SEER heat pumps have a solid corefilter--drier located in the discharge line. Due to its loca-tion in the refrigerant circuit it uses a unique oversize ca-pacity drier with a high temperature binder.

NOTE: Replacement of the discharge line drier must bethe exact same as marked on the original factorydrier. See Source 1 for replacement drier.

Failure to do so or using a substitute drier or a gran-ular type may result in damage to the equipment.

OUTDOOR THERMOSTATSAn outdoor thermostat may be used with this heat pumpsystem. See last page of these instructions. Select theproper location for mounting the outdoor thermostat (seeinstructions packed with outdoor thermostat).

INDOOR UNITSInstall the indoor coil in the furnace or air handler accord-ing to the installation instructions packed with each com-ponent.


REFRIGERANT LINESThe following steps are very important when setting up arefrigeration system and need to be followed completelyto insure that a strong, flexible and leak tight system isobtained.

The installation of the copper refrigerant tubing must bedone with care to obtain reliable, trouble--free operation.

1. Selection of proper refrigerant tubing grade and size.

2. Refrigerant line routing, cutting and fitting.

3. Insulating the vapor line.

4. Connecting the refrigerant lines to the indoor coil andoutdoor unit.

5. Proper preparation of joint connections.

6. Reassembling, cleaning and brazing the joint con-nections.

7. Pressure leak test all joints.

8. Evacuate refrigerant lines and indoor coil.

9. Charging refrigeration system (See Tabular DataSheet if the line length is other than 15 feet).

Use only ACR grade copper tubing and keep endssealed until joints are made.

The correct diameters of the refrigerant lines are listed inthe Tabular Data Sheet.

For best performance, select routing of refrigerant linesfor minimum distance and fewest number of bends.

Determine the path that the refrigerant lines will follow.

Starting at either the indoor coil or the outdoor unit refrig-erant line connections, carefully measure, cut, de--burrand fit copper refrigerant lines along the path previouslydetermined.

NOTE: If it is necessary for bends to be formed in thevapor line, the radius should not be less than 12inches.

Cut ends of the copper tubing square.

Remove all burrs from tubing with a reamer, file or de--burring tool.

Whether the indoor coil is above or below the outdoorunit, the vapor line should not be sloped for heat pumpinstallations.

INSULATION OF VAPOR LINEInsulate vapor line with 3/8” closed cell insulation.

Slide tubing insulation onto the vapor line so that it is cov-ered completely from the indoor coil to the outdoor unit.Be sure that the tubing is capped before sliding on insula-tion.

It is not necessary to insulate the liquid line.

NOTE: In areas of extreme temperatures and humidity,additional insulation may be required to preventexcessive condensation and loss of capacity.

Do not insulate liquid line and vapor line together. Liquid lineshould not be in contact with the vapor line. See Figure 3.

FIGURE 3 -- INSULATION OF VAPOR LINE

INCORRECT

CORRECT

LIQUIDLINE

TAPE

SHEET METAL HANGER

INSULATED VAPOR LINE

RE--ASSEMBLING, BRAZING ANDCLEANING OF JOINT CONNECTIONS

When using hard solder, an inert gas such as dry ni-trogen must be introduced and permitted to flowthrough tubing during brazing to displace air andprevent oxidation.

Remove the Schrader valve cores from the servicevalves. Remove the plugs from the service valve fieldtubing connections. Clean the joints to be brazed.

NOTE: Do not overheat the connection to be brazed asthis can cause improper flow of solder, resultingin a weak and leaking joint. Never apply heatdirectly to face of fitting.Do not heat solder by direct contact with flameof the torch.

When brazing copper tubing it is very important to pre-heat the entire joint before applying the solder. This isdone by sweeping the flame steadily and evenly aroundthe fitting, to bring both fitting and tubing up to equal tem-perature before applying the solder.

Reassemble groups of tubing and fittings, brazing sever-al joints instead of one joint at a time. This reduces thechance for error in the alignment of the assembly. Re-place Schrader valve cores. DO NOT OPEN SERVICEVALVES AT THIS TIME.

Clean joint connection immediately after brazing withwet rag.


REFRIGERANT LINE SUPPORTRefrigerant lines should be supported in a way that nodips or sags occur. We recommend four feet betweensupports. If refrigerant lines are to be attached to thehome structure, care should be taken to eliminate thetransmission of vibrations. Attach the refrigerant lines tothe indoor coil first. Remove plugs from the indoor coil,then clean joints to be brazed. Braze refrigerant lines tothe indoor coil. Attach refrigerant lines to the outdoorunit.

CHARGING AND LEAK TESTINGOn systems with or without service valves the refrigerantshould be recovered or recycled in accordance with EPAregulations. In some cases this may require puttingpiercing valves on both the high and low sides of the sys-tem.

DO NOT vent refrigerant to the outdoors.

When recovering refrigerant from a system, with a burn-out, follow a safe procedure due to possible contamina-tion.

Avoid getting the refrigerant in the eyes or on theskin.

Contaminated refrigerant must be recovered and re-turned to the local refrigeration supply house for properdisposition.

TOTAL LINE LENGTHFor systems with total line length exceeding 50 feet, seeAPPLICATION DATA, 690.01--AD1V(1296) and work-sheet 690.01--AD1.1V(791) “General Piping Recom-mendations and Refrigerant Line Length” for vapor andliquid line sizing, calibration of liquid line pressure loss orgain, determination of vapor line velocity, elevation limi-tations, orifice connections, system charging, traps, etc.

Total line lengths are limited to 75 feet due to the storagecapacity of the accumulator. Systems with total linelengths over 50 feet must be provided with:

1. Low Voltage Start Kit.

Elevation differences are limited to:

Indoor above outdoor 50 ft.. . . .

Outdoor above indoor 50 ft.. . . .

Systems with liquid line pressure loss or gain greaterthan 11 psi must be provided with corrected orifice size.

ORIFICE SELECTION (Orifice Type CoilsOnly)NOTE: The proper orifice must be installed in the indoor

coil liquid line connection prior to the connectionof the refrigerant lines.

Coil is under 35 psig (inert gas) pressure.

Each coil has an orifice installed in the fitting between theliquid line connection and distributor. The orifice is identi-fied on a label next to the liquid line connection.

The orifice shipped with the outdoor unit is based on the“most sold” combination, but it may be changed, depend-ing on the capacity and efficiency of the outdoor unit,elevation differences, and/or long total line lengths. Anadditional orifice(s) is shipped with most outdoor units forthe most commonly required replacement combinations.Other sizes must be ordered from Source 1 Parts if re-quired.

See the appropriate Tabular Data Sheet for the correctorifice size and charge adder. If the orifice size matches,nothing further is required and the refrigerant lines maybe connected per the outdoor unit instruction. However,if another orifice should be used, see the coil instructionfor details to change the orifice in the coil.

REFRIGERANT VALVE OPERATION

All outdoor units are shipped with the service valvesin the closed position. After installation of the refrig-erant lines and proper evacuation, make sure thatall valves are in the open position and that the capsare securely tightened before turning ON the elec-trical power to the outdoor unit.

All models in this series have brass service valves.These valves are not back seating. Opening or closingvalve does not close service port. Service ports haveSchrader valves for gauge connections. Use back--upwrench on valve body when removing cap to open orclose the valve. To open, insert hex wrench into stem andback out counter clockwise until stem just touches re-taining ring.

If the valve stem is backed out beyond the retainingring, system pressure could force the stem out ofthe valve body and possibly cause personal injury.In the event that the retaining ring is missing do notattempt to open the valve.


Some units may have factory installed 1--1/8” ball valves.To open the valve, remove the brass valve stem cap, lo-cated on the side of the valve, with an adjustable wrench.Next, turn the valve stem 1/4 turn CCW (away from unit).

All caps must be replaced to prevent leaks.

Replace valve cap finger tight, then tighten an additional1/6 of a turn with a wrench, using a back--up wrench onthe valve body.

Do not under any circumstance connect refrigera-tion gauges or refrigerant cylinders to the vapor lineservice valve (large) gauge port. Personal injurycould result if the system is operating in the heatingmode. When checking pressures use the gaugeport located on the liquid service valve and thegauge port located to the right of the vapor line ser-vice valve.

OIL TRAPPINGWhen the outdoor unit is above the indoor coil oil trappingis necessary. Please refer to APPLICATION DATA,690.01--AD1V (1291) and worksheet 690.01--AD1.1V(791) “General Piping Recommendations and Refriger-ant Line length”.

Check the system for correct charge after all compo-nents of the system have been installed, connected andwired correctly.

Connect service gauges to low pressure port and dis-charge service ports.

Do not under any circumstance connect refrigera-tion gauges or refrigerant cylinders to the vapor lineservice valve (large) gauge port. Personal injurycould result if the system is operating.

Allow unit to operate until system pressures and temper-atures have stabilized, making sure that the pressureand temperature align with unit service data. If not, checksystem charge and adjust if necessary.

ELECTRICAL WIRING

To prevent electrical shock, open remote discon-nect so electrical supply to outdoor unit is shut off.Contactor does not open both sides of the 208/230volt electrical circuit.

POWER SUPPLYAll wiring must comply with N.E.C. and local codes. Seerating plate and product data sheet for volts, frequency,phase, maximum fuse size and minimum branch circuit

ampacity. Refer to the wiring diagram inside the unit con-trol box cover before connecting to power supply.

1. The 208/230 volt single phase line voltage servicewiring for the outdoor unit must include a disconnectswitch located within sight of the outdoor unit.

2. Use the correct size fuse or circuit breaker as listedon the unit rating plate and data sheet. If using non-metallic--sheathed cable (NM or NM--B) ampacitiesshall be that of 60_ C conductors per NEC 336--26.

3. Wiring connections. — Two are provided in the con-trol box:

a. One for low voltage wiring.

b. One entrance for high voltage L1 and L2.

The adjustable High Voltage Conduit Plate is factoryinstalled for 1/2” conduit connections. For 3/4” conduit,remove the screw holding the plate in place and adjustthe location of the holes. For 1” conduit, remove the con-duit plate and discard. Re--install screw to maintain theintegrity of the unit structure, regardless of the conduitbeing used. See Figures 4 & 5.

4. Power connection to the unit is facilitated by screwterminals, L1 and L2 on the outdoor unit contactor.See Figures 4 & 5.

5. Ground the outdoor unit using the ground lug pro-vided. Unless the outdoor unit is grounded throughproper wiring to the service entrance ground, a suit-able separate ground should be provided at the out-door unit.

Casing or cabinet must be permanently grounded inaccordance with National Electric Code or other ap-plicable local codes.

LOW VOLTAGEPig--tail connector wires are provided from the defrostcontrol board to the low voltage section of the controlbox. A “fingered” bushing is provided in the low voltageknockout hole. If 1/2” conduit is used for the low voltagewiring, the bushing is to be removed.

1. Route the low voltage cable through the fingeredbushing in the low voltage junction box. See Figures4 & 5.

2. Using wire nuts, connect the low voltage wiring with-in the low voltage box.

3. A minimum of 19 AWG wire must be used in con-necting the low voltage control wiring between theoutdoor unit, air handler and thermostat.

Connect thermostat and control package wiring asshown in Figure 8 and per the instructions packed withthose pieces.

FANMOTORPLUG

CONTACTOR

DUALRUN / FANCAPACITOR

GROUND LUG REVERSIBLEHIGH VOLTAGCONDUIT PLATE

“FINGERED”BUSHING

LOWVOLTAGE BOX

DEFROSTCONTROLBOARD

CRANKCASEHEATER SWITCH

FIGURE 4 -- OUTDOOR UNIT CONTROL BOX (10 SEER 018--060 & 12 SEER 018--042)


FIGURE 5 -- OUTDOOR UNIT CONTROL BOX (12 SEER 048, 060)

DEFROSTCONTROLBOARD

LOWVOLTAGE BOX


ADJUSTABLEHIGH VOLTAGE CONDUIT PLATE

FANMOTORPLUG

GROUND LUG

CONTACTOR

DEFROSTCONTROLBOARD

CONTACTOR

LOWVOLTAGE BOX


GROUND LUG ADJUSTABLEHIGH VOLTAGE CONDUIT PLATE

FANMOTORPLUG

START RELAY

STARTCAPACITOR

FIGURE 6 -- OUTDOOR UNIT CONTROL BOX (14 SEER)




Defrost CoilSensor

ReversingValve

CompressorRelay

High Pressure& High Temp. Switch

B Y R

O

W

66 X

BLKYELYELBLK BLU BLU

B B M P Y O

FIGURE 8 -- DEMAND DEFROST BOARD(14 SEER)

Figure 7 -- TIME/TEMPERATURE DEFROST BOARD(10 & 12 SEER)

K3

K1 K2

U1

R2

X/L

X/LR

R

C

C

Y

Y

OW

O

WW1\66

W1\66

C R

CO

ND

FA

N

HIG

HV

OLT

AG

E

CO

M

TH

ER

MO

ST

AT

RU

NT

IME

MIN

.S

EL

90 60 30

Time Selection Tap

Test Pin

ReversingValve

PressureSwitch

CompressorRelay

DefrostThermostat

TEST

REV

VALVE

PRESSURE

SWITCH

COMP RLY

M COM

DFST

T’STAT

AmbientSensor

Defrost

Speedup......

TestPins

FIGURE 9 -- LOW VOLTAGE WIRING -- 10, 12, & 14 SEER HEAT PUMPS -- SINGLE PHASE MODELS

7 WiresR

Y

O

W

G2

T

E2

1

B or C

L or X

R

Y

O

G

R

Y

O

X or X/L

FieldInstalledJumper

Red

BlkYel

Org

BrnPrp

Wht

C or B

W

W1 or 66

M

T2 T1

L2 L1

Power Wiring208/230--1--60

230--1--50

Power wiring24V Control wiring(NEC class 2)

CircuitBreaker***

DefrostControl

Gnd. Lug

Gnd.ScrewContactor

1 Jumper terminals E and W to heat onfirst stage during emergency heat.

2 Terminal not used on all thermostats.

Check the low voltage terminal block on the indoor unit for the actual arrangement of the termin43

Connect power wiring to terminal block 3TB on units without electric heat or circuit breaker.

All Wiring to be in Accordance with National Electric Code and/or Local CodesThermostat

(Typical)Indoor Unit Outdoor Unit

Low voltage terminal blockin Air Handler with electric heat

43,

60 or W2

B or C

W1


SEQUENCE OF OPERATIONCOOLINGOn call for cooling, the thermostat makes 24V circuits: Rto O, R to Y, and R to G. Circuit R to O energizes the re-versing valve, switching it to cooling position. Circuit R toY energizes the contactor, starting outdoor fan motorand compressor (after the anti--short cycle period). Cir-cuit R to G energizes the indoor unit blower relay, startingthe indoor blower motor.

HEATINGOn call for heating, thermostat makes circuits R to Y andR to G. Circuit R to Y energizes contactor, starting out-door fan motor and compressor (after the anti--shortcycle period). Circuit R to G energizes the indoor blowerrelay, starting the blower motor.

Should the temperature continue to fall, R to W is madethrough the second stage of the thermostat. Circuit R toW energizes the supplement electric heat. The field--installed outdoor thermostat option can be used to turnon only the first stage of electric heat if the temperature isabove the setting temperature. If gas/propane furnace isused as the supplement heat, add--on control kit(2AC02700701) must be used. See the add--on controlinstallation instruction for the system operation.

EMERGENCY HEATWhen the switch on the thermostat is placed in emergen-cy heat position:

1. Emergency light is energized.

2. Compressor circuit is locked out. (No “R” to “Y”).

3. Supplemental and standby heaters (if installed) willbe controlled by first stage of heating thermostat.

4. Indoor blower will operate on demand for heat andcycle off with the last heater element when in“AUTO” position.

10 & 12 SEER WITH TIME/TEMP.DEFROSTSAFETY LOCKOUT MODE:The lock out control opens the circuits to the compressorcontactor, stopping the compressor in response to the(400#) high pressure limit switch opening for more thanone second. the compressor will remain off until the highpressure switch recloses. During the period the switch isopen, the control will provide a pulsed output at the “X”terminal to indicate the lock--out condition. After the highpressure switch recloses, the compressor can restart af-ter a 5 minute anti--short cycle period. If the unit experi-ences a second high pressure switch opening within a sixhour period, the control will go into a lockout conditionand will not allow the compressor to restart unless reset.

To reset the lockout, turn the indoor thermostat’s systemswitch to “OFF” then, back to the selected mode within 5seconds OR disconnect the power to the transformer forat least two seconds. Please note that thermostats withanti--short cycle timers will only be able to reset by dis-connecting the power to the transformer for at least twoseconds.

The defrost control is a time/temp. control which includesa field--selectable (white tap located at board edge) timeperiod between defrost cycle (30, 60, and 90 minutes).Factory set at 60 minutes. See Figures 6.

The electronic timer and the defrost cycle will start onlywhen the contactor is energized and the defrost thermo-stat is closed. The defrost thermostat is closed when theliquid temperature falls below approximately 31º F.

The defrost mode is identical to the cooling mode exceptthat the outdoor fan motor stops and the first stage ofheat (5KW if electric heat) is turned on through W1 / 66 tocontinue warming the conditioned space.

The defrost cycle will be terminated when the defrostthermostat is opened at 55_ F or 10 minutes of compres-sor accumulated run time, whichever comes first.

NOTE: The defrost thermostat delay will make the coiltemperature about 75--80_ F. Please note thatthe timer will stop the circuit when R to Y isdisconnected.

TEST PIN ON TIME/TEMP. DEFROST:The “test” terminals are designed for two uses:

1. Anti--Short Cycle By--Pass — To by--pass the anti--short cycle feature in the control, jumper the two“test” terminals for at least 2 seconds. If there is a “Y”signal to the control, jumpering the test terminal willallow the control to pull in the unit contactor immedi-ately.

NOTE: Do not hold the jumper on the test terminal formore than 9 seconds as the control will go intothe defrost mode.

2. Forced Defrost — To force the unit into the defrostmode (24V to reversing valve and no fan operation)while the unit is operating, jumper the test terminalsfor 2 seconds if the unit was running (if the unit wasnot running and step 1 above was used to start theunit, then the “test” terminals must be held for at least10 seconds). When the short is removed, the heatpump will remain in defrost until the defrost thermo-stat opens or 10 minutes expires. If the thermostatis open when the short is removed, the heat pumpwill exit defrost immediately.


14 SEER WITH DEMAND DEFROSTSAFETY LOCKOUT MODE:The lock out control opens the circuits to the compressorcontactor, stopping the compressor in response to the(400#) high pressure limit switch or the high dischargetemperature switch. The control goes into a lockout con-dition and will not allow the compressor to restart unlessreset. To reset the lockout, turn the indoor thermostat’ssystem switch to “OFF” then, back to the selected modeOR disconnect the power to the transformer for at leasttwo seconds. Please note that thermostats with anti--short cycle timers will only be able to reset by disconnect-ing the power to the transformer for at least two seconds.

DEMAND DEFROST:The defrost control is a demand defrost control. See Fig-ure 7. Due to the arrangement of the refrigerant circuitwithin the outdoor coil of these units, frost may accumu-late unevenly in different sections of the coil. However, anormal defrost may occur even though the coil is notcompletely covered with frost. The defrost cycle will startonly under the following conditions:

1. Contactor is energized.

2. A minimum of 39 minutes have elapsed since thelast defrost.

3. The liquid temperature measured by defrost coilsensor must be less than 40_F.

4. The liquid temperature measured by the defrost coilsensor must be below the defrost initiation tempera-ture for 4.5 minutes continuously.

The defrost mode is identical to the cooling mode exceptthat the outdoor fan motor stops and the first stage ofheat is turned on through “66” to continue warming theconditioned space.

The defrost cycle will terminate when the defrost coilsensor reaches 75_F or after 14 minutes defrost time.

NOTE: Under certain low ambient conditions normalinitiation of a normal defrost cycle may notoccur. Therefore as a precautionary measure a“Forced Defrost” is initiated every six hours toensure compressor longevity by returning oilback to the sump of the compressor.

TEST PINS ON DEMAND DEFROST:The test pins labeled “speed--up” and “defrost” are pro-vided to aid in field servicing of the heat pump. See Fig-ure 7. The pins are designed to be temporarily shortedtogether either by a screwdriver or with a 1/4” femalespade connector.

When the “speed--up” pins are shorted together. ALLtimings are speeded up by a factor of 64. This reducesthe anti--recycle compressor timer from 5 minutes toabout 5 seconds and the defrost terminate time from 14minutes to 13 seconds: additionally, the 39 minute mini-mum run time would be shorted to about 40 seconds orless if the system has operated for some period of timesince last defrost.

When the “defrost” pins are shorted together, the controlwill allow the unit to go into a defrost cycle if the compres-sor is operating. When the short is removed, the heatpump will remain in defrost until the coil temperaturereaches 75_ or 14 minutes expires.

If the liquid (coil) temperature happens to be above 75_F,the short must be maintained to keep the unit in a defrostcycle. It should be used since the unit WILL REMAIN indefrost until the short is removed regardless of coil tem-perature. This could cause a lockout due to high dis-charge pressure!

NOTE: Anytime the “defrost” shorting pins arejumpered, it automatically resets all timingcycles. After a power failure, all timing cycleswould also reset except one that is the 5 minutedelay for compressor restart. It can be reduced,however by jumpering the “speed--up” pins onthe control board.


FIGURE 10 -- FLOW DIAGRAM -- 018 thru 048 (10 & 12 SEER)

OUTDOORCOIL

LIQUIDSENSOR

FIELD CONNECTED LINE

FLOWRATER(cooling)

COMPRESSOR

FILTER DRYER(solid core)

4--WAYREVERSINGVALVE*

FIELD CONNECTED LINE INDOORCOIL

SUCTIONACCUMULATOR

FLOW RATER(HEATING)

COOLING CYCLE FLOWHEATING CYCLE FLOW * Shown in cooling position.

FIGURE 11 -- FLOW DIAGRAM -- 060

.

OUTDOORCOIL

LIQUIDSENSOR

COMPRESSOR

FIELD CONNECTED LINEINDOORCOIL

FIELD CONNECTED LINECHECK VALVE

ORIFICE (heating)



The indoor coil is shipped with an orifice.The orifice must be replaced with a TXV kit.

** NOTE:

COOLING CYCLE FLOW

HEATING CYCLE FLOW * Shown in cooling position.

BI--FLOWTXV/CHECKVALVE**

SUCTIONACCUMULATOR


FIGURE 12 -- FLOW DIAGRAM -- 024 thru 048 (14 SEER)

OUTDOORCOIL

LIQUIDSENSOR

FIELD CONNECTED LINE

NON ADJUSTABLETHERMALEXPANSIONVALVE (cooling)

COMPRESSOR



FIELD CONNECTED LINE INDOORCOIL

NON ADJUSTABLE THERMALEXPANSION VALVE (heating)

COOLING CYCLE FLOW

HEATING CYCLE FLOW * Shown in cooling position.

x

x

SUCTIONACCUMULATOR

CHARGE COMPENSATOR(empty in cooling / full in heating)

INSTALLERAfter installation is complete, place unit data sheet andinstallation instructions in customer packet and give tohome owner.

OPTIONAL OUTDOOR THERMOSTAT KITThe function of the outdoor thermostat kit is to preventunnecessary use of auxiliary electric heat. At tempera-

ture above the setting of the outdoor thermostat, theelectric heat is locked out and all of the heat is providedby the heat pump.

The setting or the outdoor thermostat is important and isideally selected at the home “balance point”, when theheat pump capacity is equal to the heat loss of the home.See instructions packed with these kits.

Proud Sponsorof the 1998

U.S. Olympic Team

Heating and Air Conditioning

Unitary Products Group5005 York Drive, Norman, OK 73069Subject to change without notice. Printed in U.S.A.Copyright E by Unitary Products Group 1999. All Rights Reserved.

035--15727--403515.16--N3Y (999)Code: SBY

installation instruction supersedes: 515.16--n3y...

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