48TC*DSingle Package Rooftop, Gas Heating/Electric Cooling Unitwith Puronr (R---410A) Refrigerant:Sizes 08, 12, and 14 with NOVATION™ CoilSizes 08 --- 14 with Round Tube/Plate Fin Coil

Installation Instructions

NOTE: Read the entire instruction manual before startingthe installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . .

INSTALLATION 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 1 -- Plan for Unit Location 6. . . . . . . . . . . . . . . . . .

Step 2 -- Plan for Sequence of Unit Installation 7. . . . . .

Step 3 -- Inspect Unit 7. . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 4 -- Provide Unit Support 7. . . . . . . . . . . . . . . . . . .

Step 5 -- Field Fabricate Ductwork 10. . . . . . . . . . . . . . .

Step 6 -- Rig and Place Unit 10. . . . . . . . . . . . . . . . . . . .

Step 7 -- Convert to Horizontal & Connect Ductwork 11

Step 8 -- Install Outside Air Hood 11. . . . . . . . . . . . . . .

Step 9 -- Install Flue Hood 13. . . . . . . . . . . . . . . . . . . . .

Step 10 -- Install Gas Piping 13. . . . . . . . . . . . . . . . . . . .

Step 11 -- Install External Condensate Trap and Line 16

Step 12 -- Make Electrical Connections 17. . . . . . . . . . .

Step 13 -- Humidi--MiZert —Space RH Controller 41. . . . . . . . . . . . . . . . . .

Step 14 -- Adjust Factory--Installed Options 46. . . . . . . .

Step 15 -- Install Accessories 46. . . . . . . . . . . . . . . . . . .

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personalinjury or property damage. Consult a qualified installer,service agency, or your distributor or branch forinformation or assistance. The qualified installer oragency must use factory--authorized kits or accessorieswhen modifying this product. Refer to the individualinstructions packaged with the kits or accessories wheninstalling.

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,National Electrical Code (NEC); in Canada, CSA C22.1)for special requirements.

It is important to recognize safety information. This is the

safety--alert symbol . When you see this symbol on theunit and in instructions or manuals, be alert to thepotential for 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 ordeath. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.

2

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personalinjury or death.

Disconnect gas piping from unit when leak testing atpressure greater than 0.5 psig (3450 Pa). Pressuresgreater than 0.5 psig (3450 Pa) will cause gas valvedamage resulting in hazardous condition. If gas valveis subjected to pressure greater than 0.5 psig (3450Pa), it must be replaced before use. When pressuretesting field--supplied gas piping at pressures of 0.5psig (3450 Pa) or less, a unit connected to such pipingmust be isolated by closing the manual gas valve.

! WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personalinjury or death.

Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lockout tag. Unit may have more than onepower switch.

! WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personalinjury, death and/or equipment damage.

Puronr (R--410A) refrigerant systems operate athigher pressures than standard R--22 systems. Do notuse R--22 service equipment or components on Puronrefrigerant equipment.

! WARNING

PERSONAL INJURY AND ENVIRONMENTALHAZARD

Failure to follow this warning could cause personalinjury or death.

Relieve pressure and recover all refrigerant beforesystem repair or final unit disposal.

Ware safety glasses and gloves when handlingrefrigerants. Keep torches and other ignition sourcesaway from refrigerants and oils.

! WARNING

CUT HAZARD

Failure to follow this caution may result in personalinjury.

Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicingfurnaces.

CAUTION!

48TC*D

3

Horizontal Connections / Economizer

Vertical Connections / Economizer

C08563

Fig. 1 -- Unit Dimensional Drawing – 08, 09 and 12 Size Units

48TC*D

4

C08566

Fig. 1 -- Unit Dimensional Drawing – 08, 09 and 12 Size Unit (cont.)

48TC*D

5

Horizontal Connections / Economizer

Vertical Connections / Economizer

C08567

Fig. 2 -- Unit Dimensional Drawing – 14 Size Unit

48TC*D

6

C08568

Fig. 2 -- Unit Dimensional Drawing – 14 Size Unit (cont.)

INSTALLATIONJobsite Survey

Complete the following checks before installation.

1. Consult local building codes and the NEC (NationalElectrical 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 Location

Select a location for the unit and its support system (curbor other) that provides for the minimum clearancesrequired for safety. This includes the clearance tocombustible surfaces, unit performance and service accessbelow, around and above unit as specified in unitdrawings. See Fig. 3.

NOTE: Consider also the effect of adjacent units.

Be sure that the unit is installed such that snow will notblock the combustion intake or flute outlet.

Unit may be installed directly on wood flooring or onClass A, B, or C roof--covering material when roof curb isused.

18” (457)

42" (1067)

18" (457)42" (1067)

1

Required bottom condensate drain connection.Otherwise, 36” (914mm) for condensate connection.

1

C08619

Fig. 3 -- Service Clearance Dimensional Drawing

Do not install unit in an indoor location. Do not locate airinlets near exhaust vents or other sources of contaminatedair. For proper unit operation, adequate combustion andventilation air must be provided in accordance withSection 5.3 (Air for Combustion and Ventilation) of theNational Fuel Gas Code, ANSI Z223.1 (AmericanNational Standards Institute) and NFPA (National FireProtection Association) 54 TIA----54----84----1. In Canada,installation must be in accordance with the CAN1----B149installation codes for gas burning appliances.

48TC*D

7

Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall ontothe unit.

Locate mechanical draft system flue assembly at least 4 ft(1.2 m) from any opening through which combustionproducts could enter the building, and at least 4 ft (1.2 m)from any adjacent building (or per local code). Locate theflue assembly at least 10 ft (3.05 m) from an adjacentunit’s fresh air intake hood if within 3 ft (0.91 m) of sameelevation (or per local code). When unit is locatedadjacent to public walkways, flue assembly must be atleast 7 ft (2.1 m) above grade.

Select a unit mounting system that provides adequateheight to allow installation of condensate trap perrequirements. Refer to Step 11 — Install ExternalCondensate Trap and Line – for required trap dimensions.

Roof mount —

Check building codes for weight distributionrequirements. Unit operating weight is shown in Table 1.

Step 2 — Plan for Sequence of Unit Installation

The support method used for this unit will dictate differentsequences for the steps of unit installation. For example,on curb--mounted units, some accessories must beinstalled on the unit before the unit is placed on the curb.Review the following for recommended sequences forinstallation steps.

Curb--mounted installation —

Install curbInstall field--fabricated ductwork inside curbInstall accessory thru--base service connection package(affects curb and unit) (refer to accessory installationinstructions for details)Prepare bottom condensate drain connection to suitplanned condensate line routing (refer to Step 11 fordetails)Rig and place unitInstall outdoor air hoodInstall flue hoodInstall gas pipingInstall condensate line trap and piping

Make electrical connectionsInstall other accessories

Pad--mounted installation —

Prepare pad and unit supportsCheck and tighten the bottom condensate drainconnection plugRig and place unitConvert unit to side duct connection arrangementInstall field--fabricated ductwork at unit duct openingsInstall outdoor air hoodInstall flue hoodInstall gas pipingInstall condensate line trap and pipingMake electrical connectionsInstall other accessories

Frame--mounted installation —

Frame--mounted applications generally follow thesequence for a curb installation. Adapt as required tosuit specific installation plan.

Step 3 — Inspect unit

Inspect unit for transportation damage. File any claimwith transportation agency.

Confirm before installation of unit that voltage, amperageand circuit protection requirements listed on unit dataplate agree with power supply provided.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown inFig. 4. Assemble and install accessory roof curb inaccordance with instructions shipped with the curb.

NOTE: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket supplied withthe roof curb as shown in Fig. 4. Improperly appliedgasket can also result in air leaks and poor unitperformance.

Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are show inFig. 5. Refer to Accessory Roof Curb InstallationInstructions for additional information as required.

Table 1 – Operating Weights

48TC*D UNITS LB (KG)Component D08 D09 D12 D14

Base Unit 825 (374.5) 930 (422) 940 (427) 1116 (506)

Economizer

Vertical 80 (36) 80 (36) 80 (36) 80 (36)

Horizontal 105 (48) 105 (48) 105 (48) 105 (48)

Powered Outlet 32 (15) 32 (15) 32 (15) 32 (15)

Humidi---MiZer™ System 70 (32) 70 (32) 75 (34) —

Curb

14--- in/356 mm 133 (65) 133 (65) 133 (65) 133 (65)

24--- in/610 mm 174 (79) 174 (79) 174 (79) 174 (79))

48TC*D

8

Install insulation, cant strips, roofing felt, and counterflashing as shown. Ductwork must be attached to curb andnot to the unit. The accessory thru--the--base power andgas connection package must be installed before the unitis set on the roof curb. If field--installed thru--the--roofcurb gas connections are desired, use factory--suppliedpipe coupling and gas plate assembly to mount thethru--the--roof curb connection to the roof curb. Gasconnections and power connections to the unit must befield installed after the unit is installed on the roof curb.

If electric and control wiring is to be routed through thebasepan, attach the accessory thru--the--base serviceconnections to the basepan in accordance with theaccessory installation instructions.

Slab Mount (Horizontal Units Only) —

Provide a level concrete slab that extends a minimum of 6in. (150 mm) beyond unit cabinet. Install a gravel apron infront of condenser coil air inlet to prevent grass andfoliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curbif required.

Alternate Unit Support (In Lieu of Curb or SlabMount) —

A non--combustible sleeper rail can be used in the unitcurb support area. If sleeper rails cannot be used, supportthe long sides of the unit with a minimum of 3 equallyspaced 4--in. x 4--in. (102 mm x 102 mm) pads on eachside.

48TC*D

9

48TC*D08 - 1448TC*D08 - 14

UNIT SIZEROOFCURBACCESSORY

CRRFCURB003A01

CRRFCURB004A01

1’ - 2”(356)2’ - 0”(610)

C08546

Fig. 4 -- Roof Curb Details

48TC*D

10

A-B0.5” (13)

B-C1.0” (25)

A-C1.0” (25)

MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)

C06110

Fig. 5 -- Unit Leveling Tolerances

Step 5 — Field Fabricate Ductwork

Cabinet 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 roofcurb and building structure. Do not connect ductwork tounit.

Insulate and weatherproof all external ductwork, joints,and roof openings with counter flashing and mastic inaccordance with applicable codes.

Ducts passing through unconditioned spaces must beinsulated 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 withapplicable fire codes.

A minimum clearance is not required around ductwork.

Step 6 — Rig and Place Unit

Keep unit upright and do not drop. Spreader bars are notrequired if top crating is left on unit. Rollers may be usedto move unit across a roof. Level by using unit frame as areference. See Table 1 and Fig. 6 for additionalinformation.

Lifting holes are provided in base rails as shown in Fig. 6.Refer to rigging instructions on unit.

UNIT DAMAGE HAZARD

Failure to follow this caution may result inequipment damage.

All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.

CAUTION!

Before setting the unit onto the curb, recheck gasketing oncurb.

C06005

UNITMAX WEIGHT

DIMENSIONSA B C

LB KG IN MM IN MM IN MM48TC*D08 1445 657 88.0 2235 43.0 1090 41.5 105548TC*D09 1565 711 88.0 2235 42.5 1080 49.5 125548TC*D12 1605 730 88.0 2235 42.0 1065 49.5 125548TC*D14 1760 800 88.0 2235 29.5 750 53.0 1345

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 theunit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 6 -- Rigging Details

48TC*D

11

Positioning on Curb —

Position unit on roof curb so that the following clearancesare maintained: 1/4 in. (6.4 mm) clearance between theroof curb and the base rail inside the front and back, 0.0in. clearance between the roof curb and the base railinside on the duct end of the unit. This will result in thedistance between the roof curb and the base rail inside onthe condenser end of the unit being approximately equalto Fig. 4, section C--C.

Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.

Flue vent discharge must have a minimum horizontalclearance of 4 ft (1220 mm) from electric and gas meters,gas regulators, and gas relief equipment. Minimumdistance between unit and other electrically live parts is48 inches (1220 mm).

Flue gas can deteriorate building materials. Orient unitsuch that flue gas will not affect building materials.Locate mechanical draft system flue assembly at least 48in. (1220 mm) from an adjacent building or combustiblematerial.

NOTE: Installation of accessory flue discharge deflectorkit will reduce the minimum clearance to combustiblematerial to 18 in. (460 mm).

After unit is in position, remove rigging skids andshipping materials.

Step 7 — Convert to Horizontal and ConnectDuctwork (when required)

Unit is shipped in the vertical duct configuration. Unitwithout factory--installed economizer or return air smokedetector option may be field--converted to horizontalducted configuration. To convert to horizontalconfiguration, remove screws from side duct openingcovers and remove covers. Using the same screws, installcovers on vertical duct openings with the insulation--sidedown. Seals around duct openings must be tight. SeeFig. 7.

C06108

Fig. 7 -- Horizontal Conversion Panels

Field--supplied flanges should be attached to horizontalduct openings and all ductwork should be secured to theflanges. Insulate and weatherproof all external ductwork,joints, and roof or building openings with counter flashingand mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informativedata plate when insulating horizontal ductwork.

Step 8 — Install Outside Air Hood

Economizer Hood Removal and Setup -- FactoryOption

1. The hood is shipped in knock--down form and locatedin the return air compartment. It is attached to theeconomizer using two plastic tie--wraps.

2. To gain access to the hood, remove the filter accesspanel. (See Fig. 8.)

3. Locate and cut the (2) plastic tie--wraps, being carefulto not damage any wiring. (See Fig. 9.)

4. Carefully lift the hood assembly through the filteraccess opening and assemble per the steps outlined inEconomizer Hood and Two–Position Hood on page13.

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C06023

Fig. 8 -- Typical Access Panel Locations

Economizer

Cut Plastic Ties(2) Places

Remove Hood Parts

C08633

Fig. 9 -- Economizer Wiring

48TC*D

12

Two Position Damper Hood Removal and Setup --Factory Option

1. The hood is shipped in knock--down form andassembled to a metal support tray using plastic stretchwrap. Located in the return air compartment, theassembly’s metal tray is attached to the basepan andalso attached to the damper using two plastictie--wraps.

2. To gain access to the hood, remove the filter accesspanel. (See Fig. 8.)

3. Locate the (2) screws holding the metal tray to thebasepan and remove. Locate and cut the (2) plastictie--wraps securing the assembly to the damper. (SeeFig. 10.) Be careful to not damage any wiring or cuttie--wraps securing any wiring.

4. Carefully lift the hood assembly (with metal tray)through the filter access opening and assemble per thesteps outlined in Economizer Hood and Two–PositionHood on page 13.

Hood Parts

Plastic Tie WrapQty (2)

Screws for Metal TrayQty (2)

C08639

Fig. 10 -- Damper Assembly

48TC*D

13

Economizer Hood and Two--Position Hood —

NOTE: If the power exhaust accessory is to be installedon the unit, the hood shipped with the unit will not beused and must be discarded. Save the aluminum filter foruse in the power exhaust hood assembly.

1. The indoor coil access panel will be used as the top ofthe hood. Remove the screws along the sides and bot-tom of the indoor coil access panel. See Fig. 11.

SIDEPANEL

INDOORCOILACCESSPANEL

INDOORCOILACCESSPANEL

CAULKHERE

TOPSIDEPANEL

C06025

Fig. 11 -- Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert thehood sides under the panel (hood top). Use the screwsprovided to attach the hood sides to the hood top. Usescrews provided to attach the hood sides to the unit.See Fig. 12.

B

TOPPANEL

INDOOR COILACCESS PANEL

19 1/16”SCREW

HOOD DIVIDER

LEFTHOODSIDE

33 3/8”(848mm)

(483mm)

C06026

Fig. 12 -- Economizer Hood Construction

3. Remove the shipping tape holding the economizer ba-rometric relief damper in place.

4. Insert the hood divider between the hood sides. SeeFig. 12 and 13. 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 bottomfilter rack (hood divider). Push the filter into positionpast the open filter clips. Close the filter clips to lockthe filter into place. See Fig. 13.

DIVIDER

BAROMETRICRELIEF

CLEANABLEALUMINUMFILTER

FILTER

HOOD

FILTERCLIP

OUTSIDEAIR

C08634

Fig. 13 -- Economizer Filter Installation

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

7. Replace the filter access panel.

Step 9 — Install Flue Hood

Flue hood is shipped screwed to the basepan beside theburner compartment access panel. Remove from shippinglocation and using screws provided, install flue hood andscreen in location shown in Fig. 14.

BLOWERACCESSPANEL

C07081

Fig. 14 -- Flue Hood Details

Step 10 — Install Gas Piping

Installation of the gas piping must be accordance withlocal building codes and with applicable national codes.In U.S.A., refer to NFPA 54/ANSI Z223.1 National FuelGas Code (NFGC). In Canada, installation must beaccordance with the CAN/CSA B149.1 and CAN/CSAB149.2 installation codes for gas burning appliances.

This unit is factory equipped for use with Natural Gas fuelat elevations up to 2000 ft (610 m) above sea level. Unitmay be field converted for operation at elevations above

48TC*D

14

2000 ft (610 m) and/or for use with liquefied petroleumfuel. See accessory kit installation instructions regardingthese accessories.

NOTE: Furance gas input rate on rating plate is forinstallation up to 2000 ft (610 m) above sea level. InU.S.A. the input rating for altitudes above 2000 ft (610 m)must be derated by 4% for each 1000 ft (305 m) above sealevel. In Canada the input rating must be derated by 10%for altitudes of 2000 ft (610 m) to 4500 ft (1372 m) abovesea level.

For natural gas applications, gas pressure at unit gasconnection must not be less than 4 in. wg (996 Pa) orgreater than 13 in. wg (3240 Pa) while the unit isoperating. For liquified petroleum applications, the gaspressure must not be less than 11 in. wg (2740 Pa) orgreater than 13 in. wg (3240 Pa) at the unit connection.

The gas supply pipe enters the unit at the burner accesspanel on the front side of the unit, through the long slot atthe bottom of the access panel. The gas connection to theunit is made to the 1/2--in. or 3/4--in. FPT gas inlet port onthe unit gas valve. See 48TC Gas Heat/Electric coolingPackaged Rooftop 3 to 12.5 Nominal Tons Product Datafor complete details.

Table 2 – Natural Gas Supply Line Pressure Ranges

UNIT MODEL UNIT SIZE MIN MAX

48TC*D 08, 09, 12, 14 4.0 in. wg(996 Pa)

13.0 in. wg(3240 Pa)

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damageto equipment.

When connecting the gas line to the unit gas valve,the installer MUST use a backup wrench to preventdamage to the valve.

CAUTION!

Install a gas supply line that runs to the unit heatingsection. Refer to the NFPA 54/NFGC or equivalent codefor gas pipe sizing data. Do not use a pipe smaller than thesize specified. Size the gas supply line to allow for amaximum pressure drop of 0.5--in wg (124 Pa) betweengas regulator source and unit gas valve connection whenunit is operating at high--fire flow rate.

The gas supply line can approach the unit in three ways:horizontally from outside the unit (across the roof),thru--curb/under unit basepan (accessory kit required) orthrough unit basepan (factory--option or accessory kitrequired). Consult accessory kit installation instructionsfor details on these installation methods.

Factory--Option Thru--Base Connections —

This service connection kit consists of a NPT gas adapterfitting, an electrical bulkhead connector and a 3/4--inelectrical bulkhead connector, all factory--installed in theembossed (raised) section of the unit basepan in thecondenser section.

LOW VOLTAGECONDUITCONNECTOR

STAINLESS STEEL FITTING

HIGH VOLTAGECONDUITCONNECTOR

C008621

Fig. 15 -- Thru--Base Connection Fittings

The thru--base gas connector has male and female threads.The male threads protrude above the basepan of the unit;the female threads protrude below the basepan.

Check tightness of connector lock nuts before connectinggas piping.

Gas Line: Install a 1/2--in (08 & 09 size Low Gas unitsonly) or 3/4--in (for all other units) NPT street elbow onthe thru--base gas fitting. Attach an appropriate size pipenipple with minimum length of 16--in (406 mm)(field--supplied) to the street elbow and extend it throughthe access panel at the gas support bracket. See Fig. 16.

EMBOSSMENT STAINLESS STEEL FITTING SUPPORTBRACKET

C08579

Fig. 16 -- Gas Line Piping

Other hardware required to complete the installation ofthe gas supply line will include a manual shutoff valve, asediment trap (drip leg) and a ground--joint union. Apressure regulator valve may also be required (to convertgas pressure from pounds to inches of pressure). Themanual shutoff valve must be located within 6--ft (1.83 m)of the unit. The union, located in the final leg entering theunit, must be located at least 9--in (230 mm) away fromthe access panel to permit the panel to be removed forservice. If a regulator valve is installed, it must be locateda minimum of 4--ft (1220 mm) away from the unit’s flueoutlet. Some municipal codes require that the manualshutoff valve be located upstream of the sediment trap.See Fig. 17 and Fig. 18 for typical piping arrangementsfor gas piping that has been routed through the sidewall ofthe curb. See Fig. 19 for typical piping arrangement whenthru--base is used. Ensure that all piping does not blockaccess to the unit’s main control box or limit the requiredworking space in front of the control box.

48TC*D

15

9” (229mm) min

Union

Shut OffValve

DripLeg

Thru-Curb Adapter

Unit Base Rail

C07469

Fig. 17 -- Gas Piping with Thru--Curb Accessory

DripLeg

Shut OffValve

Union

Thru-Curb Adapter

BurnerAccessPanel

9” (229mm) min

Unit Base Rail

C07470

Fig. 18 -- Gas Piping with Thru--Curb Accessory(alternate layout)

C08018

Fig. 19 -- Gas Piping with Thru--Base Accessory

When installing the gas supply line, observe local codespertaining to gas pipe installations. Refer to the NFPA54/ANSI Z223.1 NFGC latest edition (in Canada,CAN/CSA B149.1). In the absence of local buildingcodes, adhere to the following pertinentrecommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe1/4--in. in every 15 ft (7 mm in every 5 m) to preventtraps. Grade all horizontal runs downward to risers.Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physicaland thermal damage. Support all piping with appro-priate straps, hangers, etc. Use a minimum of onehanger every 6 ft (1.8 m). For pipe sizes larger than1/2--in., follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and onlyto male threads of joint when making pipe connec-tions. Use only pipe dope that is resistant to action ofliquefied petroleum gases as specified by local and/ornational codes. If using PTFE (Teflon) tape, ensurethe material is Double Density type and is labeled foruse on gas lines. Apply tape per manufacturer’s in-structions.

4. Pressure--test all gas piping in accordance with localand national plumbing and gas codes before connect-ing piping to unit.

NOTE: Pressure test the gas supply system after the gassupply piping is connected to the gas valve. The supplypiping must be disconnected from the gas valve during thetesting of the piping systems when test pressure is inexcess of 0.5 psig (3450 Pa). Pressure test the gas supplypiping system at pressures equal to or less than 0.5 psig(3450 Pa). The unit heating section must be isolated fromthe gas piping system by closing the external main manualshutoff valve and slightly opening the ground--joint union.

Check for gas leaks at the field--installed andfactory--installed gas lines after all piping connectionshave been completed. Use soap--and--water solution (ormethod specified by local codes and/or regulations).

48TC*D

16

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personalinjury, death and/or property damage.

S Connect gas pipe to unit using a backup wrench toavoid damaging gas controls.

S Never purge a gas line into a combustion chamber.S Never test for gas leaks with an open flame. Use a

commercially available soap solution madespecifically for the detection of leaks to check allconnections.

S Use proper length of pipe to avoid stress on gascontrol manifold.

! WARNING

NOTE: If orifice hole appears damaged or it is suspectedto have been redrilled, check orifice hole with a numbereddrill bit of correct size. Never redrill an orifice. Aburr--free and squarely aligned orifice hole is essential forproper flame characteristics.

BURNER ORIFICE

A93059

Fig. 20 -- Orifice Hole

Step 11 — Install External Condensate Trap andLine

The unit has one 3/4-in. condensate drain connection onthe end of the condensate pan and an alternate connectionon the bottom. See Fig. 21. Unit airflow configurationdoes not determine which drain connection to use. Eitherdrain connection can be used with vertical or horizontalapplications.

When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Dothis before setting the unit in place. The red drain pan canbe tightened 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 sidedrain connection.

DRAIN(FACTORY-INSTALLED)

PLUG

CONDENSATE PAN (SIDE VIEW)

STANDARDSIDE DRAIN

ALTERNATEBOTTOM DRAIN

C08021

Fig. 21 -- Condensate Drain Pan (Side View)

The piping for the condensate drain and external trap canbe completed after the unit is in place. See Fig. 22.

NOTE: Trap should be deep enough to offset maximum unit staticdifference. A 4” (102) trap is recommended.

MINIMUM PITCH1” (25mm) PER10’ (3m) OF LINE

BASE RAIL

OPENVENT

TO ROOFDRAIN

DRAIN PLUG

ROOFCURB

SEE NOTE

2˝ (51) MIN

C08022

Fig. 22 -- Condensate Drain Piping Details

All units must have an external trap for condensatedrainage. Install a trap at least 4-in. (102 mm) deep andprotect against freeze-up. If drain line is installeddownstream from the external trap, pitch the line awayfrom the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Donot use a pipe size smaller than the unit connection(3/4-in.).

48TC*D

17

Step 12 — Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personalinjury or death.

Do not use gas piping as an electrical ground. Unitcabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility ofpersonal injury if an electrical fault should occur. Thisground may consist of electrical wire connected tounit ground lug in control compartment, or conduitapproved for electrical ground when installed inaccordance with NEC (National Electrical Code);ANSI/NFPA 70, latest edition (in Canada, CanadianElectrical Code CSA [Canadian StandardsAssociation] C22.1), and local electrical codes.

! WARNING

NOTE: Check all factory and field electrical connectionsfor tightness. Field--supplied wiring shall conform withthe limitations of 63_F (33_C) rise.

Field Power Supply —

If equipped with optional Powered Convenience Outlet:The power source leads to the convenience outlet’stransformer primary are not factory connected. Installermust connect these leads according to required operationof the convenience outlet. If an always--energizedconvenience outlet operation is desired, connect thesource leads to the line side of the unit--mounteddisconnect. (Check with local codes to ensure this methodis acceptable in your area.) If a de--energize via unitdisconnect switch operation of the convenience outlet isdesired, connect the source leads to the load side of theunit disconnect. On a unit without a unit--mounteddisconnect, connect the source leads to compressorcontactor C and indoor fan contactor IFC pressure lugswith unit field power leads.

All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit isto be connected to a 208-v power supply, the controltransformer must be rewired by moving the black wirewith the 1/4-in. female spade connector from the 230--vconnection and moving it to the 208-v 1/4-in. maleterminal on the primary side of the transformer. Refer tounit label diagram for additional information. Field powerwires will be connected line--side pressure lugs on thepower terminal block or at factory--installed optionnon--fused disconnect.

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 boxcomponent arrangement) or at factory--installed optionnon--fused disconnect switch. Max wire size is #4 AWG(copper only).

NOTE: TEST LEADS -- Unit may be equipped withshort leads (pigtails) on the field line connection points oncontactor C or optional disconnect switch. These leads are

for factory run--test purposes only; remove and discardbefore connecting field power wires to unit connectionpoints. Make field power connections directly to lineconnection pressure lugs only.

! WARNINGFIRE HAZARD

Failure to follow this warning could result inintermittent operation or performance satisfaction.

Do not connect aluminum wire between disconnectswitch and furnace. Use only copper wire.(See Fig. 23.)

COPPER

WIRE ONLY

ELECTRICDISCONNECT

SWITCH

ALUMINUMWIRE

A93033

Fig. 23 -- Disconnect Switch and Unit

Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch perNEC (National Electrical Code) of adequate size.Disconnect sizing data is provided on the unit informativeplate. Locate on unit cabinet or within sight of the unit pernational or local codes. Do not cover unit informativeplate if mounting the disconnect on the unit cabinet.

Units with Factory--Installed Disconnect —

The factory--installed option disconnect switch is locatedin a weatherproof enclosure located under the maincontrol box. The manual switch handle is accessiblethrough an opening in the access panel.

All units --

All field wiring must comply with NEC and all localcodes. Size wire based on MCA (Minimum Circuit Amps)on the unit informative plate. See Fig. 24 for power wiringconnections to the unit power terminal block andequipment ground. Maximum wire size is #4 ga AWG perpole.

Provide a ground--fault and short--circuit over--currentprotection device (fuse or breaker) per NEC Article 440(or local codes). Refer to unit informative data plate forMOCP (Maximum Over--current Protection) device size.

48TC*D

18

C IFC

Disconnect factory test leadsand discard.

13 13

L1 L2 L3208/230-3-60

460-3-60575-3-60

Units Without Disconnect Option

Units With Disconnect Option

1 3 5

2 4 6

L1 L2 L3

FactoryWiring

Disconnectper

NEC

OptionalDisconnect

Switch

11

C09349

Fig. 24 -- Power Wiring Connections

Convenience Outlets —

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personalinjury or death.

Units with convenience outlet circuits may usemultiple disconnects. Check convenience outlet forpower status before opening unit for service. Locateits disconnect switch, if appropriate, and open it.Tag--out this switch, if necessary.

! WARNING

Two types of convenience outlets are offered on 48TC*Dmodels: Non--powered and unit--powered. Both typesprovide a 125--volt GFCI (ground--faultcircuit--interrupter) duplex receptacle rated at 15--Abehind a hinged waterproof access cover, located on theend panel of the unit. See Fig. 25.

ConvenienceOutletGFCI

Pwd-COFuse Switch

Pwd-COTransformer

Control BoxAccess Panel

C08128

Fig. 25 -- Convenience Outlet Location

Installing Weatherproof Cover –

A weatherproof while-in-use cover for thefactory-installed convenience outlets is now required byUL standards. This cover cannot be factory-mounted dueits depth; it must be installed at unit installation. Forshipment, the convenience outlet is covered with a blankcover plate.

The weatherproof cover kit is shipped in the unit’s controlbox. The kit includes the hinged cover, a backing plateand gasket.

DISCONNECT ALL POWER TO UNIT ANDCONVENIENCE OUTLET.

Remove the blank cover plate at the convenience outlet;discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, untilapproximately 1/2-in (13 mm) under screw heads areexposed. Press the gasket over the screw heads. Slip thebacking plate over the screw heads at the keyhole slotsand align with the gasket; tighten the two screws untilsnug (do not over-tighten).

Mount the weatherproof cover to the backing plate asshown in Fig. 26. Remove two slot fillers in the bottom ofthe cover to permit service tool cords to exit the cover.Check for full closing and latching.

RECEPTACLENOT INCLUDED

COVER – WHILE-IN-USE WEATHERPROOF

BASE PLATE FOR GFCI RECEPTACLE

C09022

Fig. 26 -- Weatherproof Cover Installation

Non--powered type: This type requires the fieldinstallation of a general--purpose 125--volt 15--A circuitpowered from a source elsewhere in the building. Observenational and local codes when selecting wire size, fuse orbreaker requirements and disconnect switch size andlocation. Route 125--v power supply conductors into thebottom of the utility box containing the duplex receptacle.

Unit--powered type: A unit--mounted transformer isfactory--installed to stepdown the main power supplyvoltage to the unit to 115--v at the duplex receptacle. Thisoption also includes a manual switch with fuse, located ina utility box and mounted on a bracket behind theconvenience outlet; access is through the unit’s controlbox access panel. See Fig. 25.

48TC*D

19

The primary leads to the convenience outlet transformerare not factory--connected. Selection of primary powersource is a customer--option. If local codes permit, thetransformer primary leads can be connected at theline--side terminals on the unit--mounted non--fuseddisconnect or HACR breaker switch; this will provideservice power to the unit when the unit disconnect switchor HACR switch is open. Other connection methods willresult in the convenience outlet circuit being de--energizedwhen the unit disconnect or HACR switch is open. SeeFig. 27.

C08283

UNITVOLTAGE

CONNECTAS

PRIMARYCONNECTIONS

TRANSFORMERTERMINALS

208,230 240 L1: RED +YEL

L2: BLU + GRAH1 + H3H2 + H4

460 480L1: REDSplice BLU + YELL2: GRA

H1H2 + H3H4

575 600 L1: REDL2: GRA

H1H2

Fig. 27 -- Powered Convenience Outlet Wiring

Duty Cycle: the unit--powered convenience outlet has aduty cycle limitation. The transformer is intended toprovide power on an intermittent basis for service tools,lamps, etc; it is not intended to provide 15--amps loadingfor continuous duty loads (such as electric heaters forovernight use). Observe a 50% limit on circuit loadingabove 8--amps (i.e., limit loads exceeding 8--amps to 30minutes 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 phasingif the GFCI receptacle does not trip as required. Press theRESET button to clear the tripped condition.

Fuse on power type: The factory fuse is a Bussman“Fusetron” T--15, non--renewable screw--in (Edison base)type plug fuse.

Using unit--mounted convenience outlets: Units withunit--mounded convenience outlet circuits will oftenrequire that two disconnects be opened to de--energize all

power to the unit. Treat all units as electrically energizeduntil the convenience outlet power is also checked andde--energization is confirmed. Observe National ElectricalCode Article 210, Branch Circuits, for use of convenienceoutlets.

Factory--Option Thru--Base Connections —

This service connection kit consists of a 1/2--in electricalbulkhead connector and a 11/4--in electrical bulkheadconnector, all factory--installed in the embossed (raised)section of the unit basepan in the condenser section. The1/2--in bulkhead connector enables the low--voltage controlwires to pass through the basepan. The 11/4--in electricalbulkhead connector allows the high--voltage power wiresto pass through the basepan. See Fig. 15.

Check tightness of connector lock nuts before connectingelectrical conduits.

Field--supplied and field--installed liquidtight conduitconnectors and conduit may be attached to the connectorson the basepan. Pull correctly rated high voltage and lowvoltage through appropriate conduits. Connect the powerconduit to the internal disconnect (if unit is so equipped)or to the external disconnect (through unit side panel). Ahole must be field cut in the main control box bottom onthe left side so the 24--v control connections can be made.Connect the control power conduit to the unit control boxat this hole.

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. 24.

All Units —

Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. SeeTable 10. On 3--phase units, voltages between phases mustbe balanced within 2% and the current within 10%. Usethe formula shown in the legend for Table 10, Note 2 todetermine the percent of voltage imbalance. Operation onimproper line voltage or excessive phase imbalanceconstitutes abuse and may cause damage to electricalcomponents. Such operation would invalidate anyapplicable Carrier warranty.

Field Control Wiring —

The 48TC*D unit requires an external temperature controldevice. This device can be a thermostat (field--supplied)or a PremierLink controller (available as factory--installedoption or as field--installed accessory, for use on a CarrierComfort Network or as a stand alone control) or theRTU--MP Controller for Building Management Systemsusing non--CCN protocols (RTU--MP is available as afactory--installed option only).

Thermostat —

Install a Carrier--approved accessory 2--stage thermostataccording to installation instructions included with the

48TC*D

20

accessory. Locate the thermostat accessory on a solid wallin the conditioned space to sense average temperature inaccordance with the thermostat installation instructions.

If the thermostat contains a logic circuit requiring 24--vpower, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If thethermostat does not require a 24--v source (no “C”connection required), use a thermostat cable or equivalentwith minimum of six leads. Check the thermostatinstallation instructions for additional features whichmight require additional conductors in the cable.

For wire runs up to 50 ft. (15 m), use no. 18 AWG(American Wire Gage) insulated wire (35_C minimum).For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulatedwire (35_C minimum). For over 75 ft. (23 m), use no. 14AWG insulated wire (35_C minimum). All wire sizeslarger than no. 18 AWG cannot be directly connected tothe thermostat and will require a junction box and spliceat the thermostat.

TypicalThermostatConnections

CentralTerminal Board

W1

Y2

Y1

R

W2

G

C

X

W1

Y2

Y1

R

W2

G

C

X

T–STAT

C

W2

G

W1

O/B/Y2

R

Y1

(see Note)

Note : Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Field Wiring

C09350

Fig. 28 -- Typical Low--Voltage Control Connections

Unit without thru--base connection kit —

Pass the thermostat control wires through the holeprovided in the end panel (see item “D” in the viewlabeled “LEFT” in Fig. 1 & 2); then feed the wiresthrough the raceway built into the corner post to thecontrol box. Pull the wires over to the terminal strip on theupper--left corner of the Central Terminal Board (CTB).See Fig. 29.

NOTE: If thru--the--bottom connections accessory isused, refer to the accessory installation instructions forinformation on routing power and control wiring.

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stageand 0.14 amp for second--stage heating, when available.

RACEWAY

HOLE IN END PANEL (HIDDEN)

C08027

Fig. 29 -- Field Control Wiring Raceway

48TC*D

21

PremierLinkt (Factory--Option) —

C08199

Fig. 30 -- PremierLink Controller

The PremierLink controller (see Fig. 30) is compatiblewith Carrier Comfort Networkr (CCN) devices. Thiscontrol is designed to allow users the access and ability tochange factory--defined settings, thus expanding thefunction of the standard unit control board. CCN serviceaccess tools include System Pilot (TM), Touch Pilot (TM)and Service Tool. (Standard tier display tools Navigatortand Scrolling Marquee are not suitable for use with latestPremierLink controller (Version 2.x).)

The PremierLink control is factory--mounted in the48TC*D unit’s main control box to the left of the CentralTerminal Board (CTB). Factory wiring is completedthrough harnesses connected to the CTB thermostat. Fieldconnections are made at a 16--pole terminal block (TB1)located on the bottom shelf of the unit control box in frontof the PremierLink controller. The factory--installedPremierLink control includes the supply--air temperature(SAT) sensor. The outdoor air temperature (OAT) sensor isincluded in the FIOP/accessory EconoMi$ert2 package.

The PremierLink controller requires the use of a Carrierelectronic thermostat or a CCN connection for timebroadcast to initiate its internal timeclock. This isnecessary for broadcast of time of day functions(occupied/unoccupied).

NOTE: PremierLink controller is shipped in Sensormode. To be used with a thermostat, the PremierLinkcontroller must be configured to Thermostat mode. Referto PremierLink Configuration instructions for OperatingMode.

Supply Air Temperature (SAT) Sensor — OnFIOP--equipped 48TC*D unit, the unit is supplied with asupply--air temperature (SAT) sensor (33ZCSENSAT).

This sensor is a tubular probe type, approx 6--inches (12.7mm) in length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied tothe supply--air opening (on the horizontal opening end) inits shipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2--in. hole in the flange or duct.Use two field--supplied, self--drilling screws to secure thesensor probe in a horizontal orientation. See Fig. 31.

SUPPLY AIR RETURN AIR

SUPPLY AIRTEMPERATURESENSOR

ROOFCURB

C08200

Fig. 31 -- Typical Mounting Location for Supply AirTemperature (SAT) Sensor on Small Rooftop Units

NOTE: Refer to Form 33CS--58SI for completePremierLink configuration, operating sequences andtroubleshooting information. Have a copy of this manualavailable at unit start--up.

48TC*D

22

NOTE: The sensor must be mounted in the dischargeairstream downstream of the cooling coil and any heatingdevices. Be sure the probe tip does not come in contactwith any of the unit’s heater surfaces.

Outdoor Air Temperature (OAT) Sensor — The OAT isfactory--mounted in the EconoMi$er2 (FIOP oraccessory). It is a nominal 10k ohm thermistor attached toan eyelet mounting ring.

EconoMi$er2 — The PremierLink control is used withEconoMi$er2 (option or accessory) for outdoor airmanagement. The damper position is controlled directlyby the PremierLink control; EconoMi$er2 has no internallogic device.

Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensor

Refer to Table 3 for accessory part numbers.

Field connections — Field connections for accessorysensor and input devices are made at the 16--pole terminalblock (TB1) located on the control box bottom shelf infront of the PremierLink control (See Fig. 32). Some inputdevices also require a 24--vac signal source; connect atCTB terminal R at “THERMOSTAT” connection strip forthis signal source. See connections figures on followingpages for field connection locations (and for continuedconnections at the PremierLink board inputs).

Table 4 provides a summary of field connections for unitsequipped with Space Sensor. Table 5 provides a summary

of field connections for units equipped with SpaceThermostat.

Space Sensors -- The PremierLink controller isfactory--shipped configured for Space Sensor Mode. ACarrier T--55 or T--56 space sensor must be used. T--55space temperature sensor provides a signal of spacetemperature to the PremierLink control. T--56 providessame space temperature signal plus it allows foradjustment of space temperature setpoints from the face ofthe sensor by the occupants.

Connect T--55 -- See Fig. 33 for typical T--55 internalconnections. Connect the T--55 SEN terminals to TB1terminals 1 and 3 (see Fig. 34).

Connect T--56 -- See Fig. 35 for T--56 internalconnections. Install a jumper between SEN and SETterminals as illustrated. Connect T--56 terminals to TB1terminals 1, 3 and 5 (see Fig. 36).

Connect Thermostat — A 7--wire thermostat connectionrequires a 24--v power source and a common connection.Use the R and C terminals on the CTB’s THERMOSTATconnection strip for these. Connect the thermostat’s Y1,Y2, W1, W2 and G terminals to PremierLink TB1 asshown in Fig. 37.

If the 48TC*D unit is equipped with factory--installedsmoke detector(s), disconnect the factory BLU lead atTB1--6 (Y2) before connecting the thermostat. Identify theBLU lead originating at CTB--DDC--1; disconnect atTB1--6 and tape off. Confirm that the second BLU lead atTB1--6 remains connected to PremierLink J4--8.

Table 3 – PremierLink Sensor Usage

APPLICATIONOUTDOOR AIRTEMPERATURESENSOR

RETURN AIRTEMPERATURESENSOR

OUTDOOR AIRENTHALPY SENSOR

RETURN AIRENTHALPY SENSOR

Differential Dry BulbTemperature withPremierLink

(PremierLink requires4---20 mA Actuator)

Included ---CRTEMPSN001A00

Required ---33ZCT55SPTor equivalent

--- ---

Single Enthalpy withPremierLink

(PremierLink requires4---20mA Actuator)

Included ---Not Used --- Requires ---

33CSENTHSW ---

Differential Enthalpywith PremierLink

(PremierLink requires4---20mA Actuator)

Included ---Not Used --- Requires ---

33CSENTHSWRequires ---33CSENTSEN

NOTES:CO2 Sensors (Optional):33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.33ZCASPCO2 --- Aspirator box used for duct---mounted CO2 room sensor.33ZCT55CO2 --- Space temperature and CO2 room sensor with override.33ZCT56CO2 --- Space temperature and CO2 room sensor with override and setpoint.

48TC*D

23

POW

ER24

VAC

NC

NO

RJ-4

5

RJ-4

5

10

6

DD

C

C09604

Fig. 32 -- PremierLink Wiring Schematic

48TC*D

24

2 3 4 5 61

SW1

SEN

BRN (GND)BLU (SPT)

RED(+)WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

C08201

Fig. 33 -- T--55 Space Temperature Sensor Wiring

SEN J6-7

J6-6

1

3

TB1 PL

SEN

C08212

Fig. 34 -- PremierLink T--55 Sensor

2 3 4 5 61

SW1

SEN SET

Cool Warm

BRN (GND)BLU (SPT)

RED(+)WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

JUMPERTERMINALSAS SHOWN

BLK(T56)

C08202

Fig. 35 -- T--56 Internal Connections

SEN J6-7

J6-6

1

3

TB1 PL

SEN

SET

Jumper

TB1 PL

J6-55SET

C08213

Fig. 36 -- PremierLink T--56 Sensor

48TC*D

25

Table 4 – Space Sensor Mode

TB1 TERMINAL FIELD CONNECTION INPUT SIGNAL1 T55---SEN/T56---SEN Analog (10k thermistor)2 RMTOCC Discrete, 24VAC3 T55---SEN/T56---SEN Analog (10k thermistor)4 CMPSAFE Discrete, 24VAC5 T56---SET Analog (10k thermistor)6 FSD Discrete, 24VAC7 LOOP---PWR Analog, 24VDC8 SPS Discrete, 24VAC9 IAQ---SEN Analog, 4---20mA10 FILTER Discrete, 24VAC11 IAQ---COM/OAQ---COM/RH---COM Analog, 4---20mA12 CCN + (RED) Digital, , 5VDC13 OAQ---SEN/RH---SEN Analog, 4---20mA14 CCN Gnd (WHT) Digital, 5VDC15 AUX OUT(Power Exhaust) (Output)Discrete 24VAC16 CCN --- (BLK) Digital, 5VDC

LEGEND:T55 --- Space Temperature SensorT56 --- Space Temperature SensorCCN --- Carrier Comfort Network (communication bus)CMPSAFE --- Compressor SafetyFILTER --- Dirty Filter SwitchFSD --- Fire ShutdownIAQ --- Indoor Air Quality (CO2)OAQ --- Outdoor Air Quality (CO2)RH --- Relative HumiditySFS --- Supply Fan Status

Table 5 – Thermostat Mode

TB1 TERMINAL FIELD CONNECTION INPUT SIGNAL1 RAT SEN Analog (10k thermistor)2 G Discrete, 24VAC3 RAT SEN Analog (10k thermistor)4 Y1 Discrete, 24VAC56 Y2 Discrete, 24VAC7 LOOP---PWR Analog, 24VDC8 W1 Discrete, 24VAC9 IAQ---SEN Analog, 4---20mA10 W2 Discrete, 24VAC11 IAQ---COM/OAQ---COM/RH---COM Analog, 4---20mA12 CCN + (RED) Digital, 5VDC13 OAQ---SEN/RH---SEN Analog, 4---20mA14 CCN Gnd (WHT) Digital, 5VDC15 AUX OUT (Power Exhaust) (Output) Discrete 24VAC16 CCN --- (BLK) Digital, 5VDC

LEGEND:CCN --- Carrier Comfort Network (communication bus)G --- Thermostat FanIAQ --- Indoor Air Quality (CO2)OAQ --- Outdoor Air Quality (CO2)RAT --- Return Air TemperatureRH --- Relative HumidityW1 --- Thermostat Heat Stage 1W2 --- Thermostat Heat Stage 2Y1 --- Thermostat Cool Stage 1Y2 --- Thermostat Cool Stage 2

48TC*D

26

Connect Thermostat — A 7--wire thermostat connectionrequires a 24--v power source and a common connection.Use the R and C terminals on the CTB’s THERMOSTATconnection strip for these. Connect the thermostat’s Y1,Y2, W1, W2 and G terminals to PremierLink TB1 asshown in Fig. 37.

G J4-12

J4-10

J4-8

Y1

Y2

2

R R

4

6

J4-6

J4-4W2

C

8

10

C

SPACETHERMOSTAT

PL

CTBTHERMOSTAT

W1

TB1

CTBTHERMOSTAT

C08119

Fig. 37 -- Space Thermostat Connections

If the 48TC*D unit has an economizer system andfree--cooling operation is required, a sensor representingReturn Air Temperature must also be connected(field--supplied and installed). This sensor may be a T--55Space Sensor (see Fig. 33) installed in the space or in thereturn duct, or it may be sensor PNO 33ZCSENSAT,installed in the return duct. Connect this sensor to TB1--1and TB1--3 per Fig. 34.

Configure the unit for Thermostat Mode — Connect to theCCN bus using a CCN service tool and navigate toPremierLink Configuration screen for Operating Mode.Default setting is Sensor Mode (value 1). Change thevalue to 0 to reconfigure the controller for ThermostatMode.

When the PremierLink is configured for ThermostatMode, these functions are not available: Fire Shutdown(FSD), Remote Occupied (RMTOCC), Compressor Safety(CMPSAFE), Supply Fan Status (SFS), and Filter PressureSwitch (FILTER).

Economizer controls —

Outdoor Air Enthalpy Control (PNO 33CSENTHSW) --

The enthalpy control (33CSENTHSW) is available as afield--installed accessory to be used with the EconoMi$er2damper system. The outdoor air enthalpy sensor is part ofthe enthalpy control. (The separate field--installedaccessory return air enthalpy sensor (33CSENTSEN) isrequired for differential enthalpy control. See Fig. 38.)

Locate the enthalpy control in the economizer next to theActuator Motor. Locate two GRA leads in the factoryharness and connect the gray lead labeled “ESL” to theterminal labeled “LOW”. See Fig. 38. Connect theenthalpy control power input terminals to economizeractuator power leads RED (connect to 24V) and BLK(connect to GND).

7ESL

CTBECON

LOW

GND

24V

EnthalpySwitch

GRA

BLK

RED

Factory Wiring Harness

ECONOMOTOR

C09026

Fig. 38 -- Enthalpy Switch (33CSENTHSW) Connections

The outdoor enthalpy changeover setpoint is set at theenthalpy controller.

Differential Enthalpy Control — Differential enthalpycontrol is provided by sensing and comparing the outsideair and return air enthalpy conditions. Install the outdoorair enthalpy control as described above. Add and install areturn air enthalpy sensor.

ESLLOW

GND

24V

GRA

BLK

RED ECONOMOTOR

– 4-20 Main

+ VDC Out

– 4-20 Main Out

+ 24-36 VDC In

C09027

Fig. 39 -- Outside and Return Air Enthalpy SensorWiring

To wire the return air enthalpy sensor, perform thefollowing:

1. Use a 2--conductor, 18 or 20 AWG, twisted pair cableto connect the return air enthalpy sensor to the enthal-py controller.

2. Connect the field--supplied RED wire to (+) spadeconnector on the return air enthalpy sensor and the(+) terminal on the enthalpy controller. Connect theBLK wire to (--) spade connector on the return air en-thalpy sensor and the (--) terminal on the enthalpycontroller.

Indoor Air Quality (CO2 sensor) — The indoor air qualitysensor accessory monitors space carbon dioxide (CO2)levels. This information is used to monitor IAQ levels.Several types of sensors are available, for wall mountingin the space or in return duct, with and without LCDdisplay, and in combination with space temperaturesensors. Sensors use infrared technology to measure thelevels of CO2 present in the space air.

48TC*D

27

The CO2 sensors are all factory set for a range of 0 to2000 ppm and a linear mA output of 4 to 20. Refer to theinstructions supplied with the CO2 sensor for electricalrequirements and terminal locations. See Fig. 40 fortypical CO2 sensor wiring schematic.

8 7 6 5 4 3 2 12 1

H G 24 VACOR

24 VDC

NC ALARMRELAYCONTACTS

COMNO }

0-10VDCSIG COM4-20mA

+

+-

+ -

J3 J4

C08635

Fig. 40 -- Indoor/Outdoor Air Quality (CO2) Sensor(33ZCSENCO2) -- Typical Wiring Diagram

To accurately monitor the quality of the air in theconditioned air space, locate the sensor near a return--airgrille (if present) so it senses the concentration of CO2leaving the space. The sensor should be mounted in alocation to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between the sensor and anycorner. Avoid mounting the sensor where it is influencedby the supply air; the sensor gives inaccurate readings ifthe supply air is blown directly onto the sensor or if thesupply air does not have a chance to mix with the room airbefore it is drawn into the return airstream.

Wiring the Indoor Air Quality Sensor —

For each sensor, use two 2--conductor 18 AWG (AmericanWire Gage) twisted--pair cables (unshielded) to connectthe separate isolated 24 vac power source to the sensorand to connect the sensor to the control board terminals.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on thesensor. See Fig. 40. Connect the 4--20 mA terminal toterminal TB1--9 and connect the SIG COM terminal toterminal TB1--11. See Fig. 41.

SEN J5-5

J5-6COM

9

7TB1

TB1IAQ Sensor

PL

24 VAC

C08636

Fig. 41 -- Indoor CO2 Sensor (33ZCSENCO2)Connections

Refer to Form 33CS--58SI, PremierLink Installation,Start--up, and Configuration Instructions, for detailedconfiguration information

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plusweatherproof enclosure) — The outdoor air CO2 sensor isdesigned to monitor carbon dioxide (CO2) levels in theoutside ventilation air and interface with the ventilationdamper in an HVAC system. The OAQ sensor is packagedwith an outdoor cover. See Fig. 42. The outdoor air CO2sensor must be located in the economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 42 -- Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO2 Sensor — A dedicated powersupply is required for this sensor. A two--wire cable isrequired to wire the dedicated power supply for the sensor.The two wires should be connected to the power supplyand terminals 1 and 2.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on theOAQ sensor. See Fig. 40. Connect the 4 to 20 mAterminal to the TB1--13 terminal of the 48TC*D . Connectthe SIG COM terminal to the TB1--11 terminal of the48TC*D. See Fig. 43.

SEN J5-2

J5-3COM

13

11TB1

TB1 PLOAQ Sensor/RH Sensor

24 VAC

C08275

Fig. 43 -- Outdoor CO2 Sensor Connections

48TC*D

28

Smoke Detector/Fire Shutdown (FSD) — This function isavailable only when PremierLink is configured for(Space) Sensor Mode. The unit is factory--wired forPremierLink FSD operation when PremierLink isfactory--installed.

On 48TC*D units equipped with factory--installed SmokeDetector(s), the smoke detector controller implements theunit shutdown through its NC contact set connected to theunit’s CTB input. The FSD function is initiated via thesmoke detector’s Alarm NO contact set. The PremierLinkcommunicates the smoke detector’s tripped status to theCCN building control. See Fig. 32, the PremierLinkwiring schematic.

Filter Status Switch — This function is available onlywhen PremierLink is configured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in twoways: By monitoring a field--supplied/installed filterpressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switchaccording to switch manufacturer’s instructions, tomeasure pressure drop across the unit’s return filters.Connect one side of the switch’s NO contact set to CTB’sTHERMOSTAT--R terminal. Connect the other side of theNO contact set to TB1--10. Setpoint for Dirty Filter is setat the switch. See Fig. 44.

R

TB1J4-4PL

Filter Switch (NO, close on rising pressure (high drop))

CTBThermostat

10

C08216

Fig. 44 -- PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filterpressure drop increases (indicating dirt--laden filters), theinput signal to PremierLink causes the filter status point toread “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS--58SI forinstructions on using the PremierLink Configurationscreens and on unit alarm sequence.

Supply Fan Status Switch — The PremierLink control canmonitor supply fan operation through afield--supplied/installed differential pressure switch. Thissequence will prevent (or interrupt) operation of unitcooling, heating and economizer functions until thepressure switch contacts are closed indicating propersupply fan operation.

Install the differential pressure switch in the supply fansection according to switch manufacturer’s instructions.Arrange the switch contact to be open on no flow and toclose as pressure rises indicating fan operation.

Connect one side of the switch’s NO contact set to CTB’sTHERMOSTAT--R terminal. Connect the other side of the

NO contact set to TB1--8. Setpoint for Supply Fan Statusis set at the switch. See Fig. 45.

R

8TB1

J4-6

PL

Fan (Pressure) Switch (NO, close on rise in pressure)CTB

Thermostat

C08118

Fig. 45 -- PremierLink Wiring Fan Pressure SwitchConnection

Remote Occupied Switch — The PremierLink controlpermits a remote timeclock to override the control’son--board occupancy schedule and place the unit intoOccupied mode. This function may also provide a “DoorSwitch” time delay function that will terminate coolingand heating functions after a 2--20 minute delay.

Connect one side of the NO contact set on the timeclockto CTB’s THERMOSTAT--R terminal. Connect the otherside of the timeclock contact to the unit’s TB1--2 terminal.

R

2TB1 PLTime Clock

Remote Occupied CTBThermostat

J4-12

C08214

Fig. 46 -- PremierLink Wiring Remote Occupied

Refer to Form 33CS--58SI for additional information onconfiguring the PremierLink control for Door Switchtimer function.

Power Exhaust (output) -- Connect the accessory PowerExhaust contactor coils(s) per Fig. 47.

J8-315

C

TB1 PLPEC TAN

GRA

Power Exhaust

CTBTHERMOSTAT

C08120

Fig. 47 -- PremierLink Power Exhaust OutputConnection

Space Relative Humidity Sensor — The RH sensor is notused with 48TC*D models at this time.

CCN Communication Bus — The PremierLink controllerconnects to the bus in a daisy chain arrangement.Negative pins on each component must be connected torespective negative pins, and likewise, positive pins oneach component must be connected to respective positivepins. The controller signal pins must be wired to the signalground pins. Wiring connections for CCN must be madeat the 3--pin plug.

At any baud (9600, 19200, 38400 baud), the number ofcontrollers is limited to 239 devices maximum. Bus length

48TC*D

29

may not exceed 4000 ft, with no more than 60 totaldevices on any 1000--ft section. Optically isolated RS--485repeaters are required every 1000 ft.

NOTE: Carrier device default is 9600 band.

COMMUNICATION BUS WIRE SPECIFICATIONS —The CCN Communication Bus wiring is field--suppliedand field--installed. It consists of shielded 3--conductorcable with drain (ground) wire. The cable selected mustbe identical to the CCN Communication Bus wire used forthe entire network.

See Table 6 for recommended cable.

Table 6 – Recommended Cables

MANUFACTURER CABLE PART NO.Alpha 2413 or 5463American A22503Belden 8772Columbia 02525

NOTE: Conductors and drain wire must be at least 20AWG, stranded, and tinned copper. Individual conductorsmust be insulated with PVC, PVC/nylon, vinyl, Teflon, orpolyethylene. An aluminum/polyester 100% foil shieldand an outer jacket of PVC, PVC/nylon, chrome vinyl, orTeflon with a minimum operating temperature range of--20_C to 60_C is required. Do not run communicationwire in the same conduit as or next to any AC voltagewiring.

The communication bus shields must be tied together ateach system element. If the communication bus is entirelywithin one building, the resulting continuous shield mustbe connected to ground at only one single point. If thecommunication bus cable exits from one building andenters another building, the shields must be connected tothe grounds at a lightning suppressor in each building (onepoint only).

Connecting CCN bus:

NOTE: When connecting the communication bus cable,a color code system for the entire network isrecommended to simplify installation and checkout. SeeTable 7 for the recommended color code.

Table 7 – Color Code Recommendations

SIGNAL TYPE CCN BUS WIRECOLOR

CCN PLUG PINNUMBER

+ Red 1Ground White 2--- Black 3

Connect the CCN (+) lead (typically RED) to the unit’sTB1--12 terminal. Connect the CCN (ground) lead(typically WHT) to the unit’s TB1--14 terminal. Connectthe CCN (--) lead (typically BLK) to the unit’s TB1--16terminal. See Fig. 48.

CCN Bus

J2-1

J2-2GND (WHT)

12

14TB1

J2-3– (BLK) 16TB1

TB1 PL+ (RED)

C08276

Fig. 48 -- PremierLink CCN Bus Connections

48TC*D

30

RTU--MP CONTROL SYSTEM

The RTU--MP controller, see Fig. 49, provides expandedstand--alone operation of the HVAC system plusconnection and control through communication withseveral Building Automation Systems (BAS) throughpopular third--party network systems. The availablenetwork systems are BACnet MP/TP, Modbus andJohnson J2. Communication with LonWorks is alsopossible by adding an accessory interface card to theRTU--MP. Selection of the communication protocol andbaud rate are made at on--board DIP switches.

The RTU--MP control is factory--mounted in the 48TC*Dunit’s main control box, to the left of the CTB. SeeFig. 50. Factory wiring is completed through harnessesconnected to the CTB. Field connections for RTU--MPsensors will be made at the Phoenix connectors on theRTU--MP board. The factory--installed RTU--MP controlincludes the supply--air temperature (SAT) sensor. Theoutdoor air temperature (OAT) sensor is included in theFIOP/accessory EconoMi$er2 package.

Refer to Table 8, RTU--MP Controller Inputs and Outputsfor locations of all connections to the RTU--MP board.

C07129

Fig. 49 -- RTU--MP Multi--Protocol Control Board

CTB

RTU-MP BoardC08585

Fig. 50 -- 48TC*D Control Box Component Locations

48TC*D

31

C09605

Fig. 51 -- RTU--MP System Control Wiring Diagram

48TC*D

32

Table 8 – RTU--MP Controller Inputs and Outputs

POINT NAME BACnet OBJECTNAME TYPE OF I/O CONNECTION PIN

NUMBERSINPUTS

Space Temperature Sensor sptsens AI (10K Thermistor) J20---1, 2Supply Air Temperature sat AI (10K Thermistor) J2---1, 2Local Outside Air Temperature Sensor oatsens AI (10K Thermistor) J2---3, 4Space Temperature Offset Pot sptopot AI (100K Potentiometer) J20---3Indoor Air Quality iaq AI (4---20 ma) J4---2, 3Outdoor Air Quality oaq AI (4---20 ma) J4---5, 6Safety Chain Feedback safety DI (24 VAC) J1---9Compressor Safety compstat DI (24 VAC) J1---2Fire Shutdown firedown DI (24 VAC) J1---10Enthalpy Switch enthalpy DI (24 VAC) J2---6, 7Humidistat Input Status humstat DI (24 VAC) J5---7, 8

CONFIGURABLE INPUTS*Space Relative Humidity sprh AI (4---20 ma)

J4---2,3 or J4---5,6Outside Air Relative Humidity oarh AI (4---20 ma)Supply Fan Status fanstat DI (24 VAC)

J5---1,2 or J5---3,4 orJ5 5,6 or J5---7,8

Filter Status filtstat DI (24 VAC)Remote Occupancy Input remocc DI (24 VAC)

OUTPUTSEconomizer Commanded Position econocmd 4---20ma J2---5Supply Fan Relay State sf DO Relay (24VAC , 1A) J1---4Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1---8Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J1---7Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1---6Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1---5Power Exhaust Relay State aux_2 DO Relay (24VAC , 1A) J11---3Dehumidification Relay State humizer DO Relay (24VAC, 1A) J11---7, 8

LEGENDAI --- Analog InputAO --- Analog OutputDI --- Discrete InputDO --- Discrete Output* These inputs (if installed) take the place of the default input on the specific channel according to schematic.Parallel pins J5---1 = J2---6, J5---3 = J1---10, J5---5 = J1---2 are used for field--- installation.

The RTU--MP controller requires the use of a Carrierspace sensor. A standard thermostat cannot be used withthe RTU--MP system.

Supply Air Temperature (SAT) Sensor -- OnFIOP--equipped 48TC*D unit, the unit is supplied with asupply--air temperature (SAT) sensor (33ZCSENSAT).This sensor is a tubular probe type, approx 6--inches (12.7mm) in length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied tothe supply--air opening (on the horizontal opening end) inits shipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2--in. hole in the flange or duct.Use two field--supplied, self--drilling screws to secure thesensor probe in a horizontal orientation. See Fig. 31.

Outdoor Air Temperature (OAT) Sensor -- The OAT isfactory--mounted in the EconoMi$er2 (FIOP or

accessory). It is a nominal 10k ohm thermistor attached toan eyelet mounting ring.

EconoMi$er2 -- The RTU--MP control is used withEconoMi$er2 (option or accessory) for outdoor airmanagement. The damper position is controlled directlyby the RTU--MP control; EconoMi$er2 has no internallogic device.

Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensor

Field Connections -- Field connections for accessorysensors and input devices are made the RTU--MP, at plugsJ1, J2, J4, J5, J11 and J20. All field control wiring thatconnects to the RTU--MP must be routed through theraceway built into the corner post as shown in Fig. 29.The raceway provides the UL required clearance between

48TC*D

33

high-- and low--voltage wiring. Pass the control wiresthrough the hole provided in the corner post, then feed thewires thorough the raceway to the RTU--MP. Connect tothe wires to the removable Phoenix connectors and thenreconnect the connectors to the board.

Space Temperature (SPT) Sensors

A field--supplied Carrier space temperature sensor isrequired with the RTU--MP to monitor space temperature.There are 3 sensors available for this application:

S 33ZCT55SPT, space temperature sensor with override

button

S 33ZCT56SPT, space temperature sensor with overridebutton and setpoint adjustment

S 33ZCT59SPT, space temperature sensor with LCD(liquid crystal display) screen, override button, andsetpoint adjustment

Use 20 gauge wire to connect the sensor to the controller.The wire is suitable for distances of up to 500 ft. Use athree--conductor shielded cable for the sensor and setpointadjustment connections. If the setpoint adjustment(slidebar) is not required, then an unshielded, 18 or 20gauge, two--conductor, twisted pair cable may be used.

Connect T--55 -- See Fig. 33 for typical T--55 internalconnections. Connect the T--55 SEN terminals toRTU--MP J20--1 and J20--2. See Fig. 52.

SEN

SEN

J20-1

J20-2

C08460

Fig. 52 -- RTU--MP T--55 Sensor Connections

Connect T--56 -- See Fig. 35 for T--56 internalconnections. Install a jumper between SEN and SETterminals as illustrated. Connect T--56 terminals toRTU--MP J20--1, J20--2 and J20--3 per Fig. 53.

SEN J20-1

J20-2SEN

SET

Jumper

J20-3SET

C08461

Fig. 53 -- RTU--MP T--56 Sensor Connections

Connect T--59 -- The T--59 space sensor requires aseparate, isolated power supply of 24 VAC. See Fig. 54for internal connections at the T--59. Connect the SENterminal (BLU) to RTU--MP J20--1. Connect the COMterminal (BRN) to J20--2. Connect the SET terminal (STOor BLK) to J20--3.

OR SET SEN

OPB COM- PWR+

BLU (SPT)

BLK (STO)

24 VAC

SENSORWIRING

POWERWIRING

BRN (COM)

NOTE: Must use a separate isolated transformer.

C07132

Fig. 54 -- Space Temperature Sensor Typical Wiring(33ZCT59SPT)

Economizer controls —

Outdoor Air Enthalpy Control (PNO 33CSENTHSW) --

The enthalpy control (33CSENTHSW) is available as afield--installed accessory to be used with the EconoMi$er2damper system. The outdoor air enthalpy sensor is part ofthe enthalpy control. (The separate field--installedaccessory return air enthalpy sensor (33CSENTSEN) isrequired for differential enthalpy control See below.)

Locate the enthalpy control in the economizer next to theActuator Motor. Locate two GRA leads in the factoryharness and connect the gray lead labeled “ESL” to theterminal labeled “LOW”. See Fig. 38. Connect theenthalpy control power input terminals to economizeractuator power leads RED (connect to 24V) and BLK(connect to GND).

The outdoor enthalpy changeover setpoint is set at theenthalpy controller.

Differential Enthalpy Control — Differential enthalpycontrol is provided by sensing and comparing the outsideair and return air enthalpy conditions. Install the outdoorair enthalpy control as described above. Add and install areturn air enthalpy sensor.

To wire the return air enthalpy sensor, perform thefollowing:

1. Use a 2--conductor, 18 or 20 AWG, twisted pair cableto connect the return air enthalpy sensor to the enthal-py controller.

2. Connect the field--supplied RED wire to (+) spadeconnector on the return air enthalpy sensor and the(+) terminal on the enthalpy controller. Connect theBLK wire to (--) spade connector on the return air en-thalpy sensor and the (--) terminal on the enthalpycontroller.

Indoor Air Quality (CO2 sensor) — The indoor air qualitysensor accessory monitors space carbon dioxide (CO2)levels. This information is used to monitor IAQ levels.Several types of sensors are available, for wall mounting

48TC*D

34

in the space or in return duct, with and without LCDdisplay, and in combination with space temperaturesensors. Sensors use infrared technology to measure thelevels of CO2 present in the space air.

The CO2 sensors are all factory set for a range of 0 to2000 ppm and a linear mA output of 4 to 20. Refer to theinstructions supplied with the CO2 sensor for electricalrequirements and terminal locations. See Fig. 40 fortypical CO2 sensor wiring schematic.

To accurately monitor the quality of the air in theconditioned air space, locate the sensor near a return--airgrille (if present) so it senses the concentration of CO2leaving the space. The sensor should be mounted in alocation to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between the sensor and anycorner. Avoid mounting the sensor where it is influencedby the supply air; the sensor gives inaccurate readings ifthe supply air is blown directly onto the sensor or if thesupply air does not have a chance to mix with the room airbefore it is drawn into the return airstream.

Wiring the Indoor Air Quality Sensor —

For each sensor, use two 2--conductor 18 AWG (AmericanWire Gage) twisted--pair cables (unshielded) to connectthe separate isolated 24 vac power source to the sensorand to connect the sensor to the control board terminals.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on thesensor. See Fig. 40. Connect the 4--20 mA terminal toRTU--MP terminal J4--2 and connect the SIG COMterminal to RTU--MP terminal J4--3. See Fig. 55.

SEN

COM

J4-2

J4-3

IAQ Sensor

24 VACC08462

Fig. 55 -- RTU--MP / Indoor CO2 Sensor(33ZCSENCO2) Connections

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plusweatherproof enclosure) — The outdoor air CO2 sensor isdesigned to monitor carbon dioxide (CO2) levels in theoutside ventilation air and interface with the ventilationdamper in an HVAC system. The OAQ sensor is packagedwith an outdoor cover. See Fig. 42. The outdoor air CO2sensor must be located in the economizer outside air hood.

Wiring the Outdoor Air CO2 Sensor — A dedicated powersupply is required for this sensor. A two--wire cable isrequired to wire the dedicated power supply for the sensor.The two wires should be connected to the power supplyand terminals 1 and 2.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on theOAQ sensor. See Fig. 38. Connect the 4 to 20 mAterminal to RTU--MP terminal J4--5. Connect the SIGCOM terminal to RTU--MP terminal J4--6. See Fig. 56.

SEN

COM

J4-5

J4-6

OAQ Sensor/RH Sensor

24 VACC08463

Fig. 56 -- RTU--MP / Outdoor CO2 Sensor(33ZCSENCO2) Connections

On 48TC*D units equipped with factory--installed SmokeDetector(s), the smoke detector controller implements theunit shutdown through its NC contact set connected to theunit’s CTB input. The FSD function is initiated via thesmoke detector’s Alarm NO contact set. The RTU--MPcontroller communicates the smoke detector’s trippedstatus to the BAS building control. See Fig. 32, thePremierLink wiring schematic.

The Fire Shutdown Switch configuration,MENU→Config→Inputs→input 5, identifies thenormally open status of this input when there is no firealarm.

Connecting Discrete Inputs

Filter Status

The filter status accessory is a field--installed accessory.This accessory detects plugged filters. When installingthis accessory, the unit must be configured for filter statusby setting MENU→Config→Inputs→input 3, 5, 8, or 9to Filter Status and normally open (N/O) or normallyclosed (N/C). Input 8 or 9 is recommended for easy ofinstallation. Refer to Fig. 49 and Fig. 51 for wireterminations at J5.

Fan Status

The fan status accessory is a field--installed accessory.This accessory detects when the indoor fan is blowing air.When installing this accessory, the unit must beconfigured for fan status by settingMENU→Config→Inputs→input 3, 5, 8, or 9 to FanStatus and normally open (N/O) or normally closed (N/C).Input 8 or 9 is recommended for easy of installation. Referto Fig. 49 and Fig. 51 for wire terminations at J5.

Remote Occupancy

The remote occupancy accessory is a field--installedaccessory. This accessory overrides the unoccupied modeand puts the unit in occupied mode. When installing thisaccessory, the unit must be configured for remoteoccupancy by setting MENU→Config→Inputs→input 3,

48TC*D

35

5, 8, or 9 to Remote Occupancy and normally open (N/O)or normally closed (N/C).Also set MENU→Schedules→occupancy source to DIon/off. Input 8 or 9 is recommended for easy ofinstallation. Refer to Fig. 49 and Table 8 for wireterminations at J5.

Power Exhaust (output)

Connect the accessory Power Exhaust contactor coil(s) perFig. 57.

Power Exhaust

J11-3

C

TAN

GRA

PEC

CTBTHERMOSTAT

C08464

Fig. 57 -- RTU--MP Power Exhaust Connections

Space Relative Humidity Sensor -- The RH sensor is notused with 48TC*D models at this time.

Communication Wiring -- Protocols

General

Protocols are the communication languages spoken bycontrol devices. The main purpose of a protocol is tocommunicate information in the most efficient methodpossible. Different protocols exist to provide differentkinds of information for different applications. In the BASapplication, many different protocols are used, dependingon manufacturer. Protocols do not change the function ofa controller; just make the front end user different.The RTU--MP can be set to communicate on four differentprotocols: BACnet, Modbus, N2, and LonWorks. Switch 3(SW3) on the board is used to set protocol and baud rate.Switches 1 and 2 (SW1 and SW2) are used to set theboard’s network address. See Fig 58 for the switch settingper protocol. The 3rd party connection to the RTU--MP isthrough plug J19.NOTE: Power must be cycled after changing the SW1--3switch settings.

Refer to the RTU--MP 3rd Party Integration Guide formore detailed information on protocols, 3rd party wiring,and networking.

SW3 Protocol Selection

PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1

BACnet MS/TP(Master) Unused OFF OFF OFF ON OFF Select Baud Select Baud

Modbus(Slave) Unused OFF OFF ON ON OFF Select Baud Select Baud

N2(Slave) Unused OFF OFF OFF ON ON OFF OFF

LonWorks Unused ON ON OFF ON OFF OFF OFF

NOTE:DS = Dip SwitchBACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE DS2 DS19600 OFF OFF

19,200 ON OFF

38,400 OFF ON

76,800 ON ONC07166

Fig. 58 -- RTU--MP SW3 Dip Switch Settings48TC*D

36

Local Access

BACview6 Handheld

The BACview6 is a keypad/display interface used toconnect to the RTU--MP to access the control information,read sensor values, and test the RTU, see Fig. 59. This isan accessory interface that does not come with the MPcontroller and can only be used at the unit. Connect theBACview6 to the RTU--MP’s J12 local access port. Thereare 2 password protected levels in the display (User andAdmin). The user password is defaulted to 0000 but canbe changed. The Admin password is 1111 and cannot bechanged. There is a 10 minute auto logout if a screen isidle. See Form 48--50H--T--2T, Appendix A for navigationand screen content.

Virtual BACview

Virtual BACview is a freeware computer program thatfunctions as the BACview6 Handheld. The USB Linkinterface (USB--L) is required to connect a computer tothe RTU--MP board. The link cable connects a USB portto the J12 local access port. This program functions andoperates identical to the handheld.

RTU--MP Troubleshooting

Communication LEDs

The LEDs indicate if the controller is speaking to thedevices on the network. The LEDs should reflectcommunication traffic based on the baud rate set. Thehigher the baud rate the more solid the LEDs will appear.

C07170

Fig. 59 -- BACview6 Handheld Connections

48TC*D

37

Table 9 – LEDsThe LEDs on the RTU--MP show the status of certain functions

If this LED is on... Status is...Power The RTU MP has powerRx The RTU MP is receiving data from the network segmentTx The RTU MP is transmitting data over the network segmentDO# The digital output is active

The Run and Error LEDs indicate control module and network status

If Run LED shows... And Error LED shows... Status is...2 flashes per second Off Normal

2 flashes per second 2 flashes,alternating with Run LED Five minute auto---restart delay after system error

2 flashes per second 3 flashes,then off Control module has just been formatted

2 flashes per second 4 flashes,then pause

Two or more devices on this network have thesame ARC156 network address

2 flashes per second On Exec halted after frequent system errors orcontrol programs halted

5 flashes per second On Exec start---up aborted, Boot is running5 flashes per second Off Firmware transfer in progress, Boot is running

7 flashes per second 7 flashes per second, alternating withRun LED Ten second recovery period after brownout

14 flashes per second 14 flashes per second,alternating with Run LED Brownout

On On

Failure. Try the following solutions:S Turn the RTU---MP off, then on.S Format the RTU---MP.S Download memory to the RTU---MP.S Replace the RTU---MP.

NOTE: Refer to Form 48--50H--T--2T for completeconfiguration of RTU--MP, operating sequences andtroubleshooting information. Refer to RTU--MP 3rd PartyIntegration Guide for details on configuration andtroubleshooting of connected networks. Have a copy ofthese manuals available at unit start--up.

48TC*D

38

SMOKE DETECTORS

Smoke detectors are available as factory--installed optionson 48TC*D models. Smoke detectors may be specified forSupply Air only or for Return Air without or witheconomizer or in combination of Supply Air and ReturnAir. Return Air smoke detectors are arranged for verticalreturn configurations only. All components necessary foroperation are factory--provided and mounted. The unit isfactory--configured for immediate smoke detectorshutdown operation; additional wiring or modifications tounit terminal board may be necessary to complete the unitand smoke detector configuration to meet projectrequirements.

Units equipped with factory--optional Return Air smokedetectors require a relocation of the sensor module at unitinstallation. See “Completing Installation of Return AirSmoke Sensor:” on page 40 for details.

System

The smoke detector system consists of a four--wirecontroller and one or two sensors. Its primary function isto shut down the rooftop unit in order to prevent smokefrom circulating throughout the building. It is not to beused as a life saving device.

Controller

The controller (see Fig. 60) includes a controller housing,a printed circuit board, and a clear plastic cover. Thecontroller can be connected to one or two compatible ductsmoke sensors. The clear plastic cover is secured to thehousing with a single captive screw for easy access to thewiring terminals. The controller has three LEDs (forPower, Trouble and Alarm) and a manual test/reset button(on the cover face).

Sensor

The sensor (see Fig. 61) includes a plastic housing, aprinted circuit board, a clear plastic cover, a samplingtube inlet and an exhaust tube. The sampling tube (whenused) and exhaust tube are attached during installation.The sampling tube varies in length depending on the sizeof the rooftop unit. The clear plastic cover permits visualinspections without having to disassemble the sensor. Thecover attaches to the sensor housing using four captivescrews and forms an airtight chamber around the sensingelectronics. Each sensor includes a harness with an RJ45terminal for connecting to the controller. Each sensor hasfour LEDs (for Power, Trouble, Alarm and Dirty) and amanual test/reset button (on the left--side of the housing).

Air is introduced to the duct smoke detector sensor’ssensing chamber through a sampling tube that extends intothe HVAC duct and is directed back into the ventilationsystem through a (shorter) exhaust tube. The difference inair pressure between the two tubes pulls the sampled airthrough the sensing chamber. When a sufficient amount ofsmoke is detected in the sensing chamber, the sensorsignals an alarm state and the controller automaticallytakes the appropriate action to shut down fans andblowers, change over air handling systems, notify the firealarm control panel, etc.

Duct smoke sensorcontroller

Fastener(2X)

Controller cover

Conduit nuts(supplied by installer)

Conduit support plate

Cover gasket(ordering option)

Conduit couplings(supplied by installer)

Terminal block cover

Controller housingand electronics

Alarm Power

Test/resetswitch

Trouble

C08208

Fig. 60 -- Controller Assembly

Duct smoke sensor

SeeDetail A

Exhaust tube

Plug

Sampling tube(ordered separately)

Intakegasket

Cover gasket(ordering option)

TSD-CO2(ordering option)

Sensor housingand electronics

Exhaust gasket

Coupling

Sensor cover

Detail A

Magnetictest/reset

switch

AlarmTrouble

PowerDirty

C08209

Fig. 61 -- Smoke Detector Sensor

48TC*D

39

The sensor uses a process called differential sensing toprevent gradual environmental changes from triggeringfalse alarms. A rapid change in environmental conditions,such as smoke from a fire, causes the sensor to signal analarm state but dust and debris accumulated over timedoes not.

For installations using two sensors, the duct smokedetector does not differentiate which sensor signals analarm or trouble condition.

Smoke Detector Locations

Supply Air — The Supply Air smoke detector sensor islocated to the left of the unit’s indoor (supply) fan. SeeFig. 62. Access is through the fan access panel. There isno sampling tube used at this location. The sampling tubeinlet extends through the side plate of the fan housing(into a high pressure area). The controller is located on abracket to the right of the return filter, accessed throughthe lift--off filter panel.

Smoke Detector Sensor

C08245

Fig. 62 -- Typical Supply Air Smoke Detector SensorLocation

Return Air without Economizer — The sampling tube islocated across the return air opening on the unit basepan.See Fig. 63. The holes in the sampling tube facedownward, into the return air stream. The sampling tube isconnected via tubing to the return air sensor that ismounted on a bracket high on the partition between returnfilter and controller location. (This sensor is shipped in aflat--mounting location. Installation requires that thissensor be relocated to its operating location and the tubingto the sampling tube be connected. See “CompletingInstallation of Return Air Smoke Sensor:” on page 40for details.)

Return Air Detector Sampling Tube

Controller module

Return Air Detector module(shipping position shown)*

*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 63 -- Typical Return Air Detector Location

Return Air with Economizer — The sampling tube isinserted through the side plates of the economizerhousing, placing it across the return air opening on theunit basepan. See Fig. 64. The holes in the sampling tubeface downward, into the return air stream. The samplingtube is connected via tubing to the return air sensor that ismounted on a bracket high on the partition between returnfilter and controller location. (This sensor is shipped in aflat--mounting location. Installation requires that thissensor be relocated to its operating location and the tubingto the sampling tube be connected. See installation stepsbelow.)

Return AirSampling Tube

C08129

Fig. 64 -- Return Air Sampling Tube Location

48TC*D

40

Completing Installation of Return Air SmokeSensor:

1. Unscrew the two screws holding the Return AirSensor detector plate. See Fig. 65. Save the screws.

2. Remove the Return Air Sensor and its detector plate.3. Rotate the detector plate so the sensor is facing out-

wards and the sampling tube connection is on the bot-tom. See Fig. 66.

4. Screw the sensor and detector plate into its operatingposition using screws from Step 1. Make sure thesampling tube connection is on the bottom and the ex-haust tube is on the top. See Fig. 66.

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

FlexibleExhaust Tubes

Screws

Sample Tube

C08126

Fig. 65 -- Return Air Detector Shipping Position

C08127

Fig. 66 -- Return Air Sensor Operating Position

Additional Application Data — Refer to Catalog No.HKRNKA--1XA for discussions on additional controlfeatures of these smoke detectors including multiple unitcoordination.

48TC*D

41

Step 13 — Humidi--MiZert –Space RH Controller —

The Humidi--MiZer dehumidification system requires afield--supplied and --installed space relative humiditycontrol device. This device may be a separate humidistatcontrol (contact closes on rise in space RH above controlsetpoint) or a combination thermostat--humidistat controldevice such as Carrier’s EDGER Pro Thermidistat withisolated contact set for dehumidification control. Thehumidistat is normally used in applications where atemperature control is already provided (units withPermierLinkt control).To connect the Carrier humidistat (HL38MG029):

1. Route the humidistat 2--conductor cable (field--sup-plied) through the hole provided in the unit cornerpost.

2. Feed wires through the raceway build into the cornerpost (see Fig. 29) to the 24--v barrier located on theleft side of the control box. The raceway provides theUL--required clearance between high--voltage andlow--voltage wiring.

3. Use wire nuts to connect humidistat cable to twoPINK leads in the low–voltage wiring as shown inFig. 69.

To connect the Thermidistat device (33CS2PPRH--01):1. Route the Thermidistat multi--conductor thermostat

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

2. Feed wires through the raceway build into the cornerpost (see Fig. 29) to the 24--v barrier located on theleft side of the control box. The raceway provides theUL--required clearance between high--voltage andlow--voltage wiring.

3. The Thermidistat has dry contacts at terminals D1and D2 for dehumidification operation (see Fig. 70).The dry contacts must be wired between CTBterminal R and the PINK lead to the LTLO switchwith field--supplied wire nuts. Refer to the installationinstructions included with the Carrier EdgeThermidistat device (Form 33CS--65SI or latest) formore information.

% RELATIVE HUMIDITY

C09295

Fig. 67 -- Accessory Field--Installed Humidistat

®

C09296

Fig. 68 -- EDGE Pro Thermidistat

48TC*D

42

POWER24 VAC

NC

NO

RJ-45

RJ-45

10

6

DDC

HUMIDISTAT

C09606

Fig. 69 -- Typical Humidi--MiZer Adaptive Dehumidification System Humidistat Wiring

RcRhW1

GY2C

O/W2/BY1

OATRRS

SRTNHUM

D1D2V+Vg

X*

C

G

W2

W1

Y2

Y1

R

EDGE Pro THERMIDISTATUnit CTB

THERMOSTAT

*Connection not required.

Humidi-MiZer™ FIOP

C09298

Fig. 70 -- Typical Rooftop Unit with Humidi--MiZer Adaptive Dehumidification Systemwith EDGE Pro Thermidistat Device

48TC*D

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Table 10 – Unit Wire/MOCP Sizing Data

UNIT NOM.

V---Ph---HzIFMTYPE

COMBUSTIONFAN MOTOR

FLA

POWEREXHAUSTFLA

NO C.O. or UNPWRD C.O.

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA MOCPDISC. SIZE

MCA MOCPDISC. SIZE

FLA LRA FLA LRA

48TC*D08

208/230---3---60

STD

0.48 3.8

38.8 50 41 193 42.6 50 45 197

MED 41.1 50 43 230 44.9 50 48 234

HIGH 49.0 60 52 256 52.8 60 56 260

460---3---60

STD

0.25 1.8

17.9 20 19 95 19.7 25 21 97

MED 18.7 25 20 114 20.5 25 22 116

HIGH 23.1 30 24 127 24.9 30 26 129

575---3---60

STD

0.24 3.8

13.1 15 14 77 16.9 20 18 81

MED 13.5 15 14 92 17.3 20 19 96

HIGH 16.6 20 17 106 20.4 25 22 110

48TC*D09

208/230---3---60

STD

0.48 3.8

40.0 50 42 208 43.8 50 46 212

MED 40.0 50 42 219 43.8 50 46 223

HIGH 44.8 50 47 262 48.6 60 52 266

460---3---60

STD

0.25 1.8

18.4 25 19 109 20.2 25 21 111

MED 18.4 25 19 115 20.2 25 21 117

HIGH 20.2 25 21 137 22.0 25 23 139

575---3---60

STD

0.24 3.8

14.3 20 15 89 18.1 20 19 93

MED 13.9 20 15 93 17.7 20 19 97

HIGH 14.7 20 16 104 18.5 20 20 108

48TC*D12

208/230---3---60

STD

0.48 3.8

43.7 50 46 258 47.5 60 50 262

MED 48.5 60 51 301 52.3 60 56 305

HIGH 53.5 60 57 310 57.3 70 61 314

460---3---60

STD

0.25 1.8

21.5 25 23 123 23.3 30 25 125

MED 23.3 30 25 145 25.1 30 27 147

HIGH 26.3 30 28 149 28.1 35 30 151

575---3---60

STD

0.24 3.8

16.2 20 17 93 20.0 25 21 97

MED 17.0 20 18 104 20.8 25 22 108

HIGH 19.8 25 21 118 23.6 30 25 122

48TC*D14

208/230---3---60

STD

0.48 3.8

60.7 80 63 360 64.5 80 68 364

MED 63.2 80 66 377 67.0 80 71 381

HIGH 68.2 80 72 386 72.0 80 76 390

460---3---60

STD

0.25 1.8

29.5 40 31 181 31.3 40 33 183

MED 30.5 40 32 190 32.3 40 34 192

HIGH 33.5 40 35 194 35.3 45 37 196

575---3---60

STD

0.24 3.8

22.3 30 23 142 26.1 30 28 146

MED 22.3 30 23 142 26.1 30 28 146

HIGH 25.1 30 27 156 28.9 35 31 160

NOTE: See page 45 for table legend and notes.

48TC*D

44

Table 10 — Unit Wire/MOCP Sizing Data (cont)

UNIT NOM.

V---Ph---HzIFMTYPE

COMBUSTIONFAN MOTOR

FLA

POWEREXHAUSTFLA

w/ PWRD C.O.

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA MOCPDISC. SIZE

MCA MOCPDISC. SIZE

FLA LRA FLA LRA

48TC*D08

208/230---3---60

STD

0.48 3.8

43.6 50 46 198 47.4 60 51 202

MED 45.9 50 49 235 49.7 60 53 239

HIGH 53.8 60 58 261 57.6 70 62 265

460---3---60

STD

0.25 1.8

20.1 25 21 97 21.9 25 23 99

MED 20.9 25 22 116 22.7 25 24 118

HIGH 25.3 30 27 129 27.1 30 29 131

575---3---60

STD

0.24 3.8

14.8 20 16 79 18.6 20 20 83

MED 15.2 20 16 94 19.0 25 21 98

HIGH 18.3 20 19 108 22.1 25 24 112

48TC*D09

208/230---3---60

STD

0.48 3.8

44.8 50 47 213 48.6 60 52 217

MED 44.8 50 47 224 48.6 60 52 228

HIGH 49.6 60 53 267 53.4 60 57 271

460---3---60

STD

0.25 1.8

20.6 25 22 111 22.4 25 24 113

MED 20.6 25 22 117 22.4 25 24 119

HIGH 22.4 25 24 139 24.2 30 26 141

575---3---60

STD

0.24 3.8

16.0 20 17 91 19.8 25 21 95

MED 15.6 20 17 95 19.4 25 21 99

HIGH 16.4 20 17 106 20.2 25 22 110

48TC*D12

208/230---3---60

STD

0.48 3.8

48.5 60 51 263 52.3 60 56 267

MED 53.3 60 57 306 57.1 70 61 310

HIGH 58.3 70 62 315 62.1 70 67 319

460---3---60

STD

0.25 1.8

23.7 30 25 125 25.5 30 27 127

MED 25.5 30 27 147 27.3 30 29 149

HIGH 28.5 35 31 151 30.3 35 33 153

575---3---60

STD

0.24 3.8

17.9 20 19 95 21.7 25 23 99

MED 18.7 25 20 106 22.5 25 24 110

HIGH 21.5 25 23 120 25.3 30 27 124

48TC*D14

208/230---3---60

STD

0.48 3.8

65.5 80 69 365 69.3 80 73 369

MED 68.0 80 72 382 71.8 80 76 386

HIGH --- --- --- --- --- --- --- ---

460---3---60

STD

0.25 1.8

31.7 40 33 183 33.5 40 35 185

MED 32.7 40 35 192 34.5 45 37 194

HIGH 35.7 45 38 196 37.5 45 40 198

575---3---60

STD

0.24 3.8

24.0 30 25 144 27.8 30 30 148

MED 24.0 30 25 144 27.8 30 30 148

HIGH 26.8 30 29 158 30.6 35 33 162

NOTE: See page 45 for table legend and notes.

48TC*D

45

Legend and Notes for Table 10LEGEND:CO --- Convenient outletDISC --- DisconnectFLA --- Full load ampsIFM --- Indoor fan motorLRA --- Locked rotor ampsMCA --- Minimum circuit ampsMOCP --- Maximum over current protectionPE --- Power exhaustUNPWR CO --- Unpowered convenient outletNOTES:1. In compliance with NEC requirements for multimotor andcombination load equipment (refer to NEC Articles 430 and440), the overcurrent protective device for the unit shall befuse or HACR breaker. Canadian units may be fuse or circuitbreaker.

2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supplyvoltage is greater than 2%. Use the following formula to de-termine the percentage of voltage imbalance.

% Voltage Imbalance = 100 xmax voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

AB = 224 vBC = 231 vAC = 226 v

Average Voltage =(224 + 231 + 226)

=681

3 3

= 227

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.

% Voltage Imbalance = 100 x4

227

= 1.76%

This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.IMPORTANT: If the supply voltage phase imbalance is more than2%, contact your local electric utility company immediately.

48TC*D

46

Economizer 2 Position Damper Unit Without Economizer or2 Position Damper

C08631

Fig. 71 -- EconoMi$ert IV Wiring

Step 14 — Adjust Factory--Installed Options

Smoke Detectors —

Smoke detector(s) will be connected at the ControlsConnections Board, at terminals marked “SmokeShutdown”. Remove jumper JMP 3 when ready toenergize unit.

EconoMi$er IV Occupancy Switch —

Refer to Fig. 71 for general EconoMi$er IV wiring.External occupancy control is managed through aconnection on the Central Terminal Board.

If external occupancy control is desired, connect a timeclock or remotely controlled switch (closed for Occupied,open for Unoccupied sequence) at terminals markedOCCUPANCY on CTB. Remove or cut jumper JMP 2 tocomplete the installation.

Step 15 — Install Accessories

Available accessories include:

Roof CurbThru--base connection kit (must be installed before unitis set on curb)LP conversion kitManual outside air damperHigh Altitude Gas kits

Flue Discharge DeflectorFlue Exhaust Heat ShieldLow Ambient ControlsThermostat / SensorsTwo--Position motorized outside air damperEconoMi$er2 (without control/for external signal andintegrated barometric relief)EconoMi$er2 (without control/for external signal)Power ExhaustDifferential dry--bulb sensor (EconoMi$er IV)Outdoor enthalpy sensorDifferential enthalpy sensorCO2 sensorDDC interface (PremierLink)Louvered hail guardPhase monitor controlWinter Start kit

Refer to separate installation instructions for informationon installing these accessories.

Pre--Start and Start--Up

This completes the mechanical installation of the unit.Refer to the unit’s Service Manual for detailed Pre--Startand Start--up instructions.

48TC*D

47

48TC*D

48

Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/10

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 48TC---07SI

Replaces: 48TC---06SI

48TC*D