Carrier 48HX User Manual

Installation, Start-Up andService InstructionsCONTENTSPageSAFETY CONSIDERATIONS ... 1-6General ... 1RECEI

For natural gas applications, the gas pressure at unit gasconnection must not be less than 4.0 in. wg or greater than13 in. wg while the unit is opera

7. If unit ductwork is to be attached to vertical openingflanges on the unit basepan (jackstand applications only),do so at this time.8. It is recommen

Table 2 — Maximum Gas Flow Capacity*NOMINALIRON PIPE,SIZE(in.)INTERNALDIAMETER(in.)LENGTH OF PIPE, FT†10 20 30 40 50 60 70 80 90 100 125 150 175 2001⁄

Power Entry1. Remove knockouts in fixed compressor panel located onduct panel side of unit.2. Route high-voltage leads into high-voltage terminal box.3

SPECIAL PROCEDURES FOR 208-V OPERATIONMake sure that the gas supply then the power supply tothe unit is switched OFF before making any wiringchanges.

PRE-START-UPFailure to observe the following warnings could resultin serious personal injury:1. Follow recognized safety practices and wear protec-tiv

Start Up Heating Section and MakeAdjustmentsComplete the required procedures given in Pre-Start-Upsection on page 15 before starting the unit.Do not j

If the desired gas input is 80,000 Btuh, only a minor changein the manifold pressure is required.Observe manifold pressure and proceed as follows to a

Table 5 — Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating InputHEATINGINPUT(Btuh)TEMPERATURE RISE °F20 25 30 35 40 45 50 55 60 65 7

Table 6A — Superheat Charging Table, 48HX030TEMP (F)OUTDOORENTERING AIRINDOOR AIR — 1000 CFMIndoor Air — Ewb (F)54 56 58 60 62 64 66 68 70 72 74 7665

UNIT48HXELECTRICALCHARACTERISTICSUNIT WEIGHTCORNER WEIGHT(lb/kg)lbkgABCD030040 208/230-1-60, 208/230-3-60 346 157 99/45 69/31 120/55 58/26030060 208/2

Table 6D — Superheat Charging Table, 48HX060TEMP (F)OUTDOORENTERING AIRINDOOR AIR — 1800 CFMIndoor Air — Ewb (F)54 56 58 60 62 64 66 68 70 72 74 7665

Table 8 — Dry-Coil Air Delivery* — Horizontal and Downflow Discharge at 230 and 460 V— Size 030,036 (Deduct 10% from Cfm and Watts for 208 V Operation)

Table 11 — Dry-Coil Air Delivery* Cooling and HeatPump Heating; Sizes 048,060; Horizontal andVertical Discharge for Integrated ControlMotor Units at 2

satisfied, contacts open, deenergizing contactor and relay;motors and gas heater deenergize. The IFM may be con-trolled by a time-delay relay that keep

STRAINERACCUMULATORCOMPRESSORSTRAINERLCSOUTDOOR COILINDOOR COILABDCCheck ValvesAOpenBClosedCOpenDClosedLEGENDLCS — Loss of Charge SwitchAcutrol™ Meter

STRAINERACCUMULATORCOMPRESSORSTRAINERLCSOUTDOOR COILINDOOR COILABDCCheck ValvesAClosedBOpenCClosedDOpenLEGENDLCS — Loss of Charge SwitchAcutrol™ Meter

MAINTENANCETo ensure continuing high performance, and to minimizethe possibility of premature equipment failure, periodic main-tenance must be perform

c. Use a good grade of SAE (Society of Automotive En-gineers) 20 nondetergent motor oil and put one tea-spoon (3⁄16oz. or 16 to 25 drops) in each oil

Outdoor Coil, Indoor Coil, and Condensate DrainPan —Inspect the outdoor coil, indoor coil, and conden-sate drain pan at least once each year. Proper i

Electrical Controls and Wiring — Inspect and checkthe electrical controls and wiring annually. Be sure to turnoff the gas supply, and then the electri

UNIT48HXELECTRICALCHARACTERISTICSUNIT WEIGHTCORNER WEIGHT(lb/kg)lbkgABCD030040 208/230-1-60, 208/230-3-60 370 169 105/48 75/34 126/57 64/29030060 208/

TROUBLESHOOTINGCooling and HeatingSYMPTOM CAUSE REMEDYCompressor and out-door fan will not start.OAT set above outdoor ambient temperature Lower OAT s

Cooling and Heating (cont)SYMPTOM CAUSE REMEDYExcessive suctionpressure.(Cool) High heat load Check for source and eliminate.Reversing valve hung up o

LED Troubleshooting — Error CodeSYMPTOM CAUSE REMEDYHardware failure.(LED OFF)Loss of power to control module(IGC).Check 5 amp fuse on IGC, power to u

Copyright 1998 Carrier CorporationManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and w

START-UP CHECKLIST(Remove and Store in Job File)I. PRELIMINARY INFORMATIONMODEL NO.:DATE:SERIAL NO.:TECHNICIAN:II. PRE-START-UP (insert checkmark in b

UNIT48HXELECTRICALCHARACTERISTICSUNIT WEIGHTCORNER WEIGHT(lb/kg)lb kg A B C D036060/080 208/230-1-60, 208/230-3-60 460-3-60 432 196 111/50 88/40 160/7

UNIT48HXELECTRICALCHARACTERISTICSUNIT WEIGHTCORNER WEIGHT(lb/kg)lb kg A B C D036060/080 208/230-1-60, 208/230-3-60, 460-3-60 456 207 117/53 94/43 166/

PART NUMBER ‘‘A’’FLATCPRFCURB001A00 89 [203]CPRFCURB002A00 119 [279]CPRFCURB003A00 149 [356]NOTES:1. Roof curb must be set up for unit being installed

RECEIVING AND INSTALLATIONStep 1 — Check EquipmentIDENTIFY UNIT — The unit model number and serial num-ber are stamped on unit identification plate. Ch

Use extreme caution to prevent damage when moving theunit. Unit must remain in an upright position during all rig-ging and moving operations. The unit

Table 1 — Physical DataUNIT SIZE 48HX 030040 030060 036060 036080 048080 048100 060080 060100NOMINAL CAPACITY (tons) 21⁄221⁄2334455OPERATING WEIGHT (l