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Manual Carrier 38AH044-084

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  • Carrier 38AH044-084 - page 1

    Installation, Start-Up and Service Instructions CONTENTS Page SAFETY CONSIDERA TIONS ................ 1 INST ALLA TION ............................ 1-37 Step 1 — Rig and Place Unit ............... 1 • DOMESTIC UNITS • EXPOR T UNITS • PLACING UNITS Step 2 — Check Compressor Mounting ..... 3 • UNITS 38AH044-084 • UNITS 38AH094-134 Step ...

  • Carrier 38AH044-084 - page 2

    The placement area must be level and strong enough to support the operating weight of the unit (see T able 3A or 3B). When unit is in proper location, use of mounting holes in base rails is recommended for securing unit to supporting structure. For mounting unit on vibration isolators, a perim- eter support channel between the unit and the isolator ...

  • Carrier 38AH044-084 - page 3

    Remove sheet metal cover panels from return-bend end of Module 124B or 134B. Place Module 124B or 134B in position. The exposed return-bend ends of each module are now opposite each other and facing the service space. The compressors of each module are on opposite sides of the unit. IMPOR T ANT : Modules must be placed 24 in. (610 mm) apart and squ ...

  • Carrier 38AH044-084 - page 4

    DUAL CKT SINGLE CKT SUCTION CONNECTION(S) 2 1 ⁄ 8 9 Dia [54 mm] 2 5 ⁄ 8 9 Dia [67 mm] LIQUID CONNECTION(S) 7 ⁄ 8 9 Dia [22 mm] 1 1 ⁄ 8 9 Dia [29 mm] SUCTION C 2 8 - 11 ⁄ 16 9 [627mm] 1 8 -10 5 ⁄ 16 9 [567mm] LIQUID D 1 8 -10 1 ⁄ 16 9 [561mm] 1 8 -10 5 ⁄ 16 9 [567mm] SUCTION (Ckt A) 1 8 -7 13 ⁄ 16 9 [503mm] 2 8 - 5 ⁄ 8 9 [626mm] ...

  • Carrier 38AH044-084 - page 5

    DUAL CKT SINGLE CKT SUCTION CONNECTION(S) 2 1 ⁄ 8 9 Dia [54 mm] 2 5 ⁄ 8 9 Dia [67 mm] LIQUID CONNECTION(S) 7 ⁄ 8 9 Dia [22 mm] 1 1 ⁄ 8 9 Dia [29 mm] SUCTION C 2 8 - 11 ⁄ 16 9 [627mm] 1 8 -10 5 ⁄ 16 9 [567mm] LIQUID D 1 8 -10 1 ⁄ 16 9 [561mm] 1 8 -10 5 ⁄ 16 9 [567mm] SUCTION (Ckt A) 1 8 -7 13 ⁄ 16 9 [503mm] 2 8 - 5 ⁄ 8 9 [626mm] ...

  • Carrier 38AH044-084 - page 6

    Chart 1, Field Power Supply Connections UNIT 38AH VOL T AGE Hz DIAMETER — in. (mm) QUANTITY 094 208/230 60 3 5 ⁄ 8 (92) 2 460, 575, 380 60 3 5 ⁄ 8 (92) 1 346, 380/415 50 3 5 ⁄ 8 (92) 1 LEGEND C— Copper Fin Coils MTG — Mounting SAE — Society of Automotive Engineers NOTES: 1. The approximate operating weight of the unit is: 38AH-094--- ...

  • Carrier 38AH044-084 - page 7

    Chart 1, Field Power Supply Connections UNIT 38AH VOL T AGE Hz DIAMETER — in. (mm) QUANTITY 104 208/230 60 3 5 ⁄ 8 (92) 2 460, 575, 380 60 3 5 ⁄ 8 (92) 1 346, 380/415 50 3 5 ⁄ 8 (92) 1 Fig. 4 — Dimensions — Unit 38AH104 LEGEND C— Copper Fin Coils MTG — Mounting SAE — Society of Automotive Engineers NOTES: 1. The approximate operat ...

  • Carrier 38AH044-084 - page 8

    Chart 1, Field Power Supply Connections UNIT 38AH VOL T AGE Hz DIAMETER (in.) QUANTITY 124A 124B 208/230 60 3 5 ⁄ 8 (92) 1 460, 575, 380 60 2 1 ⁄ 2 (63) 1 346, 380/415 50 3 5 ⁄ 8 (92) 1 LEGEND C— Copper Fin Coils MTG — Mounting SAE — Society of Automotive Engineers NOTES: 1. The approximate operating weight of the unit is: 38AH-124--- 7 ...

  • Carrier 38AH044-084 - page 9

    Chart 1, Field Power Supply Connections UNIT 38AH VOL T AGE Hz DIAMETER — in. (mm) QUANTITY 134A 208/230 60 3 5 ⁄ 8 (92) 1 460, 575, 380 60 2 1 ⁄ 2 (63) 1 346, 380/415 50 3 5 ⁄ 8 (92) 1 134B 208/230 60 2 1 ⁄ 2 (63) 2 460, 575 60 2 1 ⁄ 2 (63) 1 380 60 3 5 ⁄ 8 (92) 1 346, 380/415 50 3 5 ⁄ 8 (92) 1 LEGEND C— Copper Fin Coils MTG — ...

  • Carrier 38AH044-084 - page 10

    T able 3A — Units 38AH044-084 Physical Data — 50/60 Hz (English) 38AH 044 054 064 074 084 OPERA TING WEIGHT WITH Cu-Al 3259 3309 3565 3812 4057 REFRIGERANT (Approx) — Lb Cu-Cu 3547 3597 3998 4229 4735 SHIP WEIGHT WITH COIL PROTECTION ONL Y (Approx) — Lb Cu-Al 3250 3290 3530 3780 4000 Cu-Cu 3538 3578 3963 4197 4678 TYPICAL OPERA TING REFRIGE ...

  • Carrier 38AH044-084 - page 11

    T able 4A — Units 38AH094-134 Physical Data — 50/60 Hz (English) 38AH 094 104 124 134 124A 124B 134A 134B OPERA TING WEIGHT WITH Cu-Al 5088 5435 3630* 3630* 3630* 3877* REFRIGERANT (Approx) — Lb Cu-Cu 5813 6160 4063* 4063* 4063* 4294* SHIP WEIGHT WITH Cu-Al 5630 5990 3907* 3907* 3907* 4080* COIL PROTECTION AND SKID Cu-Cu 6355 6715 4340* 4340* ...

  • Carrier 38AH044-084 - page 12

    Fig. 7 — Modules 38AH124A or 134A — Shipping Locations of Piping and Sheet Metal T rim Kit RIG HERE RIG HERE RIG HERE RIG HERE CONTROL BOX SHEET MET AL COVER P ANEL (REMOVED) 24-in. (610-mm) SERVICE SP ACE Fig. 8 — Correct Placement of Modules Without Piping and Sheet Metal T rim (Unit 38AH134 Shown) 12 ...

  • Carrier 38AH044-084 - page 13

    F ACTOR Y - INSTALLED SUCTION LINE LOOP Fig. 9A — T ypical Module with Cover Panels Removed Fig. 9B — Field-Installed Suction Line Loop 38AH044-084,124,134 MOUNTING SPRINGS SHIPMENT BOL TS SHIPMENT BOL TS 38AH094,104 MOUNTING BOL TS RAIL BOL T (3) (2 SHOWN) RAIL BOL T (3) (2 SHOWN) MOUNTING BOL TS Fig. 10 — Outer View , Compressor Mounting 13 ...

  • Carrier 38AH044-084 - page 14

    Step 3 — Make Refrigerant Piping Connections The field-supplied liquid line solenoid valve must be installed at the evaporator to avoid possible compressor damage during unit operation. See Fig. 11 (for 38AH044- 084 dual-circuit and 38AH094-134 units), or Fig. 12 (for 38AH044-084 optional single-circuit units). The units have large suction lines ...

  • Carrier 38AH044-084 - page 15

    *Field-Supplied. Fig. 12 — Required Location of Solenoid V alves 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 T rap C— Suction Line to Condensing Unit D— Pipe D, Suction Riser Short Lift RED. — Reducer STR ...

  • Carrier 38AH044-084 - page 16

    T able 6A — Refrigerant Piping Requirements — 38AH044-104 Dual-Circuit Units — 60 Hz UNIT 38AH TOT AL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M) 15-25 (4.6-7.6) 25-50 (7.6-15.2) 50-75 (15.2-22.9) 75-100 (22.9-30.5) 100-150 (30.5-45.7) 150-200 (45.7-61.0) L SLS L S L S L S L S 044 Ckt A 5 ⁄ 8 1 5 ⁄ 8 7 ⁄ 8 1 5 ⁄ 8 7 ⁄ 8 2 1 ⁄ ...

  • Carrier 38AH044-084 - page 17

    T able 7A — Refrigerant Piping Requirements, 38AH044-104 Dual-Circuit Units — 50 Hz UNIT 38AH TOT AL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M) 15-25 (4.6-7.6) 25-50 (7.6-15.2) 50-75 (15.2-22.9) 75-100 (22.9-30.5) 100-150 (30.5-45.7) 150-200 (45.7-61.0) L S L S L S L S LSL S 044 Ckt A 5 ⁄ 8 1 3 ⁄ 8 7 ⁄ 8 1 5 ⁄ 8 7 ⁄ 8 1 5 ⁄ 8 ...

  • Carrier 38AH044-084 - page 18

    T able 8A — Refrigerant Piping Requirements for 38AH044-084 Optional Single-Circuit Units and 38AH124,134 Modular Units (Dual-Circuit) — 60 Hz UNIT 38AH TOT AL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M) 15-20 (4.6-6.1) 20-50 (6.1-15.2) 50-75 (15.2-22.9) 75-100 (22.9-30.5) 100-150 (30.5-45.7) 150-200 (45.7-61.0) LS L S LSLSLS LS 044 7 ⁄ ...

  • Carrier 38AH044-084 - page 19

    T able 9A — Refrigerant Piping Requirements for 38AH044-084 Optional Single-Circuit Units and 38AH124,134 Modular Units (Dual Circuit) — 50 Hz UNIT 38AH TOT AL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M) 15-20 (4.6-6.1) 20-50 (6.1-15.2) 50-75 (15.2-22.9) 75-100 (22.9-30.5) 100-150 (30.5-45.7) 150-200 (45.7-61.0) L S L S LSL S LSLS 044 7 ? ...

  • Carrier 38AH044-084 - page 20

    LEGEND TXV — Thermostatic Expansion V alve TYP — T ypical NOTE: Lower split first on, last off. Fig. 14 — T ypical Piping Connections for Face Split Coils for 38AH044-084 Dual-Circuit and 38AH094-134 Units LEGEND TXV — Thermostatic Expansion V alve TYP — T ypical NOTE: Lower split first on, last off. Fig. 15 — T ypical Piping Connecti ...

  • Carrier 38AH044-084 - page 21

    Units 38AH124 and 134 Piping Kit Connections — The 38AH124 and 134 units are delivered with a factory- supplied suction and liquid piping kit for installation in the 24-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 unit to each of the condensing unit refrige ...

  • Carrier 38AH044-084 - page 22

    BASE RAIL BOL TS (6) CORNER POST CORNER POST Fig. 17 — Units 38AH124 and 134 with Installed T rim Kit Rails END COVER FLANGES SCREWS B TOP COVER, VERTICAL PIECE VERTICAL TOP COVER FLANGE (HIDDEN) SCREWS A END COVER TOP COVER, HORIZONT AL PIECE CORNER POST MODULE 124B OR 134B 24-in. (610-mm) SERVICE W A Y CORNER POST MODULE 124A OR 134A Fig. 18 ? ...

  • Carrier 38AH044-084 - page 23

    Step 4 — Make Electrical Connections POWER SUPPL Y — Electrical characteristics of available power supply must agree with unit nameplate rating. Supply voltage must be within the limits shown in T ables 10A or 10B, 1 1 and 12. See T able 13 for control circuit data and T able 14 for fan motor electrical data. IMPOR T ANT : Operation of unit on ...

  • Carrier 38AH044-084 - page 24

    T able 10B — Electrical Data — 50/60 Hz (38AH044-084 Optional Single-Circuit Units) OPTIONAL SINGLE-CIRCUIT UNIT COMPRESSOR* 38AH V oltage Designation Compressor A1/A2 Model No. Nameplate V -Ph-Hz Supply V oltage MCA MOCP ICF A1 A2 Min Max RLA LRA RLA LRA 044 500 06E4250/250 208/230-3-60 187 254 179.4 225 434.7 67.9 345 67.9 345 600 460-3-60 41 ...

  • Carrier 38AH044-084 - page 25

    T able 1 1 — Electrical Data — 50/60 Hz (Units 38AH094,104) UNIT 38AH VOL T AGE DESIGNA TION NAMEPLA TE V -Ph-Hz SUPPL Y VOL T AGE* MCA MOCP ICF COMPRESSOR† A1 A2 B1 B2 Min Max RLA LRA RLA LRA RLA LRA RLA LRA 094 500 208/230-3-60 187 253 398.5 500 897 106.4 506 67.9 345 147.7 690 — — 600 460-3-60 414 506 183.1 225 443 46.8 253 34.6 173 65 ...

  • Carrier 38AH044-084 - page 26

    T able 12 — Electrical Data — 50/60 Hz (Units 38AH124, 134) UNIT 38AH MODULE VOL T AGE DESIGNA TION COMPRESSOR A1/A2 MODEL NO. NAMEPLA TE V -Ph-Hz SUPPL Y VOL T AGE* MCA MOCP ICF COMPRESSOR† A1 A2 Min Max RLA LRA RLA LRA 124A 124B 134A 500 06E8275/ 265 208/230-3-60 187 254 249.3 350 617.5 106.4 506 89.7 446 600 460-3-60 414 508 1 15.5 150 307 ...

  • Carrier 38AH044-084 - page 27

    T able 14 — Fan Motor Electrical Data UNIT 38AH CONDENSER F AN Nameplate V -Ph-Hz Qty Hp (kW) T otal 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 (1-4) 3.9 (1-4) 20.9 230-3-50 (1,2) 5.5 (3,4) 6 ...

  • Carrier 38AH044-084 - page 28

    LEGEND AW G — American Wire Gage CR — Control Relay HD — Heating Device IFC — Indoor-Fan Contactor IFR — Indoor-Fan Relay kcmil — Thousand Circular Mils LLS — Liquid Line Solenoid NEC — National Electrical Code (U.S.A. Standard) R— Heating Relay (field- supplied 24-v sealed coil, 10 va maximum rating) RV — Reversing V alve TB ? ...

  • Carrier 38AH044-084 - page 29

    LEGEND AW G — American Wire Gage CR — Control Relay HD — Heating Device IFC — Indoor-Fan Contactor IFR — Indoor-Fan Relay kcmil — Thousand Circular Mils LLS — Liquid Line Solenoid NEC — National Electrical Code (U.S.A. Standard) R— Heating Relay (field- supplied 24-v sealed coil, 10 va maximum rating) RV — Reversing V alve TB ? ...

  • Carrier 38AH044-084 - page 30

    LEGEND AW G — American Wire Gage CR — Control Relay HD — Heating Device IFC — Indoor-Fan Contactor IFR — Indoor-Fan Relay kcmil — Thousand Circular Mils LLS — Liquid Line Solenoid NEC — National Electrical Code (U.S.A. Standard) R— Heating Relay (field- supplied 24-v sealed coil, 10 va maximum rating) RV — Reversing V alve TB ? ...

  • Carrier 38AH044-084 - page 31

    LEGEND AW G — American Wire Gage C— Compressor Contactor CCPS — Capacity Control Pressure Switch CR — Control Relay HD — Heating Device IFC — Indoor-Fan Contactor IFR — Indoor-Fan Relay kcmil — Thousand Circular Mils LLS — Liquid Line Solenoid NEC — National Electrical Code (U.S.A. Standard) R— Heating Relay (field- supplied ...

  • Carrier 38AH044-084 - page 32

    *Field-supplied. NOTES: 1. Factory wiring is in accordance with NEC; field modifications or addi- tions must be in compliance with all applicable codes. 2. Wiring for field power supply must be rated 75 C minimum. Use cop- per , copper-clad aluminum, or aluminum conductors. Maximum incoming wire size for each terminal block is 500 kcmil. 3. T er ...

  • Carrier 38AH044-084 - page 33

    *Field-supplied. NOTES: 1. Factory wiring is in accordance with NEC; field modifications or addi- tions must be in compliance with all applicable codes. 2. Wiring for field power supply must be rated 75 C minimum. Use cop- per , copper-clad aluminum, or aluminum conductors. Maximum in com- ing wire size for each terminal block is 500 kcmil. 3. T ...

  • Carrier 38AH044-084 - page 34

    *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 each terminal block is 500 kcmil. 3. T ermin ...

  • Carrier 38AH044-084 - page 35

    *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 each terminal block is 500 kcmil. 3. T ermin ...

  • Carrier 38AH044-084 - page 36

    *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 each terminal block is 500 kcmil. 3. T ermin ...

  • Carrier 38AH044-084 - page 37

    T able 15 — Main Power Connection and Control Circuit Wiring MAIN POWER CONNECTION CONTROL CIRCUIT Electrical Characteristics (V -Ph-Hz) Qty T erminal Blocks Qty Parallel Conductors* Max Wire Size (kcmil) Control Power (V) Safety Circuit (V) 208/230-3-60 1 6 500 1 15† 24 460-3-60 575-3-60 1 3 500 1 15† 24 230-3-50 1 6 500 230 24 380-3-60 380/ ...

  • Carrier 38AH044-084 - page 38

    ST ART -UP Compressor crankcase heaters must be on for 24 hours before start-up. T o energize the crankcase heaters, set the space thermostat above the ambient so there will be no de- mand for cooling. Close the field disconnect and turn on the fan circuit breakers. Leave the compressor circuit breakers of f/open. The crankcase heaters are now ene ...

  • Carrier 38AH044-084 - page 39

    NOTE: Use only Carrier approved compressor oil. Ap- proved sources are: Petroleum Specialties Inc. (Cryol 150A), T exaco, Inc. (Capella WF-32-150), and Witco Chemical Co. (Suniso 3GS). Do not reuse oil that has been drained out, or oil that has been exposed to atmosphere. REMOVE OIL — Pump down compressor to 2 psig (14 kPag). Loosen the 1 ⁄ 4 - ...

  • Carrier 38AH044-084 - page 40

    T able 16 — Index of Lead/Lag Circuits and Compressors UNIT 38AH 044-084 STD 044-084 OPT 094 104 124 134 LEAD CIRCUIT AA A A Module 124A Module 134A Compressor , Lead A1 A1 A1 A1 A1 A1 Compressor; Lag *A 2 A 2 A 2 A 2 A 2 LAG CIRCUIT B† B B Module 124B Module 134B Compressor , Lead B1 B1 B1 A1 A1 Compressor; Lag * * B2 A2 A2 LEGEND OPT — Opti ...

  • Carrier 38AH044-084 - page 41

    Fig. 30 — Charging Chart — Unit 38AH044; 50/60 Hz — Dual Circuit Fig. 31 — Charging Chart — Unit 38AH054; 50/60 Hz — Dual Circuit 41 ...

  • Carrier 38AH044-084 - page 42

    Fig. 32 — Charging Chart — Unit 38AH064; 50/60 Hz — Dual Circuit Fig. 33 — Charging Chart — Unit 38AH074; 50/60 Hz — Dual Circuit 42 ...

  • Carrier 38AH044-084 - page 43

    Fig. 34 — Charging Chart — Unit 38AH084; 50/60 Hz — Dual Circuit Fig. 35 — Charging Chart — Unit 38AH044; 50/60 Hz — Optional Single Circuit Fig. 36 — Charging Chart — Unit 38AH054; 50/60 Hz — Optional Single Circuit 43 ...

  • Carrier 38AH044-084 - page 44

    Fig. 37 — Charging Chart — Unit 38AH064; 50/60 Hz — Optional Single Circuit Fig. 38 — Charging Chart — Unit 38AH074; 50/60 Hz — Optional Single Circuit Fig. 39 — Charging Chart — Unit 38AH084; 50/60 Hz — Optional Single Circuit 44 ...

  • Carrier 38AH044-084 - page 45

    Fig. 40 — Charging Chart — Unit 38AH094; 50/60 Hz Fig. 41 — Charging Chart — Unit 38AH104; 50/60 Hz Fig. 42 — Charging Chart — Modules 124A, 124B, and 134A; 50/60 Hz Fig. 43 — Charging Chart — Module 134B; 50/60 Hz 45 ...

  • Carrier 38AH044-084 - page 46

    SERVICE ELECTRIC SHOCK HAZARD T urn of f all power to unit before servicing. The ON-OFF switch on control panel does not shut of f control power; use field disconnect. Coil Cleaning — Clean the coils with a vacuum cleaner, compressed air , water , or a non-wire bristle brush. Refrigerant Circuit LEAK TESTING — Units are shipped with a holding ...

  • Carrier 38AH044-084 - page 47

    Winter Start Control — A2 1 ⁄ 2 -minute low-pressure switch (LPS) bypass function in the timer prevents nuisance LPS trips 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 T able 18 for pressure switch settings. NOTE: High-pressure sw ...

  • Carrier 38AH044-084 - page 48

    T able 19A — One 2-Stage Thermostat Capacity Control for 38AH044-084 Dual-Circuit Units UNIT 38AH QUANTITY OF LOADED COMPRESSOR CYLINDERS SYSTEM CAP ACITY (%) Circuit A Circuit B T otal 044 4 4 8 100 24 6 7 5 40 4 5 0 20 2 2 5 054 4 6 10 100 26 8 7 9 2 4 6* 59 40 4 4 2 20 2 2 1 064 6 6 12 100 4 6 10 84 2 6 8* 68 60 6 4 8 40 4 3 2 2 0 2* 16 074 6 ...

  • Carrier 38AH044-084 - page 49

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

  • Carrier 38AH044-084 - page 50

    38AH044-084 DUAL-CIRCUIT UNITS; 38AH094,104 — If circuit A operation is insuf f icient 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 a 60-second time delay relay (TDR) delays compressor start-up for ...

  • Carrier 38AH044-084 - page 51

    Required Compressor Modification for 38AH044- 084 Optional Single-Circuit Units, When Com- pressor A1 is Out — T o maintain unit operation, com- pressor no.1 must be operable. If it is not operable, the following temporary modifications must be made to keep the unit running: 1. Change the oil pressure switch connections from com- pressor A1 to ...

  • Carrier 38AH044-084 - page 52

    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 inside of the unit. All compressors can be removed from the com- pressor side of the unit. IMPOR T ANT : All compressor mounting hardware and support brackets removed during servicing must be ...

  • Carrier 38AH044-084 - page 53

    TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor 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. Replace transformer if primary windings receivi ...

  • Carrier 38AH044-084 - page 54

    TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR STOPS ON OIL PRESSURE SWITCH 1. Oil level too low or too high. 1. Check oil level requirements; adjust oil level until sight glass is filled 1 ⁄ 8 to 1 ⁄ 3 when running. 2. Compressor is short cycling. 2. Check for a) Thermostat location and operation. b) Safety device lockout circuit operatio ...

  • Carrier 38AH044-084 - page 55

    ST ART -UP CHECKLIST A. Preliminary Information OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER MANUF ACTURER 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 ST ART -UP? (Y/N) CHECK POWER SUPPL Y . DOES IT AGREE WITH UNIT? (Y/N) HAS THE GROUND ...

  • Carrier 38AH044-084 - page 56

    C. Start-Up CHECK EV APORA TOR F AN SPEED AND RECORD. CHECK CONDENSER F AN SPEED AND RECORD. AFTER A T 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 CONDENSER AIR TEMP LEA VING CONDENSER AIR TEMP EV AP ...

Manufacturer Carrier Category Air Conditioner

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