Carrier 38AH044-084- Manuals

*Field-Supplied. Fig. 12 — Required Location of Solenoid Valves and Recommended Filter Drier and Sight Glass Locations for 38AH044-084 Optional Single-Circuit Units LEGEND A — Pipe A, Suction Riser, without Trap B — Pipe B, Suction Riser with Trap C — Suction Line to Condensing Unit D — Pipe D, Suct...

LEGEND TXV — Thermostatic Expansion ValveTYP — TypicalNOTE: Lower split first on, last off. Fig. 14 — Typical Piping Connections for Face Split Coils for 38AH044-084 Dual-Circuit and 38AH094-134 Units LEGEND TXV — Thermostatic Expansion ValveTYP — TypicalNOTE: Lower split first on, last off. Fig. 15...

Units 38AH124 and 134 Piping Kit Connections — The38AH124 and 134 units are delivered with a factory-supplied suction and liquid piping kit for installation in the24-in. (610-mm) service space between the 2 unit modules.The piping kit allows for a common unit side piping con-nection from the indoor ...

BASE RAILBOLTS (6) CORNER POST CORNERPOST Fig. 17 — Units 38AH124 and 134 with Installed Trim Kit Rails END COVERFLANGES SCREWS B TOP COVER,VERTICALPIECE VERTICALTOP COVERFLANGE(HIDDEN) SCREWS A END COVER TOP COVER,HORIZONTALPIECE CORNERPOST MODULE 124BOR 134B 24-in. (610-mm)SERVICE WAY CORNERPOST M...

Step 4 — Make Electrical Connections POWER SUPPLY — Electrical characteristics of availablepower supply must agree with unit nameplate rating. Supplyvoltage must be within the limits shown in Tables 10A or10B, 11 and 12. See Table 13 for control circuit data andTable 14 for fan motor electrical data...

Table 12 — Electrical Data — 50/60 Hz (Units 38AH124, 134) UNIT 38AH MODULE VOLTAGE DESIGNATION COMPRESSOR A1/A2 MODEL NO. NAMEPLATE V-Ph-Hz SUPPLY VOLTAGE* MCA MOCP ICF COMPRESSOR† A1 A2 Min Max RLA LRA RLA LRA 124A124B134A 500 06E8275/ 265 208/230-3-60 187 254 249.3 350 617.5 106.4 506 89.7 446 60...

Table 14 — Fan Motor Electrical Data UNIT 38AH CONDENSER FAN Nameplate V-Ph-Hz Qty Hp (kW) Total kW (No.*) FLA Each (No.*) LRA Each 044 208/230-3-60 4 1 (0.746) 6.2 (1,2) 5.5 (3,4) 6.6 (1,2) 30.0 (3,4) 31.6 460-3-60 (1,2) 2.8 (3,4) 3.3 (1,2) 30.0 (3,4) 31.6 575-3-60 (1-4) 3.4 (1-4) 30.0 380-3-60 (1-...

*Field-supplied. NOTES:1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable codes. 2. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maxi-mum incoming wire size for...

*Field-supplied. NOTES:1. Factory wiring is in accordance with NEC. Field modifications or additions must be in compliance with all applicable codes. 2. Wiring for field power supply must be rated 75 C minimum. Use copper, copper-clad aluminum, or aluminum conductors. Maxi-mum incoming wire size for...

Table 15 — Main Power Connection and Control Circuit Wiring MAIN POWER CONNECTION CONTROL CIRCUIT Electrical Characteristics (V-Ph-Hz) Qty Terminal Blocks Qty Parallel Conductors* Max Wire Size (kcmil) Control Power (V) Safety Circuit (V) 208/230-3-60 1 6 500 115† 24 460-3-60575-3-60 1 3 500 115† 24...

START-UP Compressor crankcase heaters must be on for 24 hours before start-up. To energize the crankcase heaters, set thespace thermostat above the ambient so there will be no de-mand for cooling. Close the field disconnect and turn on thefan circuit breakers. Leave the compressor circuit breakersof...

NOTE: Use only Carrier approved compressor oil. Ap-proved sources are: Petroleum Specialties Inc. (Cryol 150A),Texaco, Inc. (Capella WF-32-150), and Witco Chemical Co.(Suniso 3GS). Do not reuse oil that has been drained out, oroil that has been exposed to atmosphere. REMOVE OIL — Pump down compresso...

Table 16 — Index of Lead/Lag Circuits and Compressors UNIT 38AH 044-084 STD 044-084 OPT 094 104 124 134 LEAD CIRCUIT A A A A Module 124A Module 134A Compressor, Lead A1 A1 A1 A1 A1 A1 Compressor; Lag * A2 A2 A2 A2 A2 LAG CIRCUIT B † B B Module 124B Module 134B Compressor, Lead B1 B1 B1 A1 A1 Compres...

SERVICE ELECTRIC SHOCK HAZARDTurn off all power to unit before servicing.The ON-OFF switch on control paneldoes not shut off control power; use fielddisconnect. Coil Cleaning — Clean the coils with a vacuum cleaner, compressed air, water, or a non-wire bristle brush. Refrigerant Circuit LEAK TESTING...

Winter Start Control — A 2 1 ⁄ 2 -minute low-pressure switch (LPS) bypass function in the timer prevents nuisance LPStrips during start-up in low-ambient conditions. High-Pressure Switch — This switch has nonadjust- able settings. Figure 29 shows connection on a cylinder head.See Table 18 for pressu...

Timer Functions — (See Timer Cycle, Fig. 47.) Each refrigeration circuit is controlled by an independent timerwhich allows for the independent operation of each refrig-eration circuit. NOTE: Unit 38AH044-084 optional single-circuit units haveone timer which controls the lead compressor. Lag compres-...

38AH044-084 DUAL-CIRCUIT UNITS; 38AH094,104 —If circuit A operation is insufficient for the cooling require-ments, the thermostat second stage TC2 closes to bring cir-cuit B on-line for cooling. This circuit follows the same se-quence of operation as the lead circuit, except a60-second time delay re...

Required Compressor Modification for 38AH044-084 Optional Single-Circuit Units, When Com-pressor A1 is Out — To maintain unit operation, com- pressor no.1 must be operable. If it is not operable, the followingtemporary modifications must be made to keep the unitrunning:1. Change the oil pressure swi...

Compressor Removal — Access to the pump end of the compressor is from the compressor side of the unit.Access to the motor end of the compressor is from the insideof the unit. All compressors can be removed from the com-pressor side of the unit. IMPORTANT: All compressor mounting hardware andsupport ...

TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUNContactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3. Check secondary fuse(s); replace with correct type and size. Re...

START-UP CHECKLIST A. Preliminary Information OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES B. Pre-Start-Up OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY. DO...

C. Start-Up CHECK EVAPORATOR FAN SPEED AND RECORD. CHECK CONDENSER FAN SPEED AND RECORD. AFTER AT LEAST 10 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS: COMP A1 COMP A2 COMP B1 COMP B2 OIL PRESSURE SUCTION PRESSURE SUCTION LINE TEMP DISCHARGE PRESSURE DISCHARGE LINE TEMP ENTERING CONDENSE...