Carrier 38TN Service Manual Download

Page: 20 / 20

33058c

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

Book 1

Tab

3a 5a 1a

PC 101

Catalog No. 513-829

Printed in U.S.A.

Form 38TN-1XA

Pg 20

3-94

Replaces: New

Summary of Contents for 38TN

Page 1: ...te ELECTRICAL 4 Aluminum Wire Contactor Capacitor PTC Devices Cycle Protector Crankcase Heater Time Delay Relay TDR Pressure Switches Fan Motor Compressor Plug Low Voltage Terminals MILLENNIUM SCROLL...

Page 2: ...truction Dimensions MODEL UNIT SIZE A B C D E F G H J K L M 38TN 024 21 32 11 3 16 23 3 4 24 1 2 42 23 11 16 24 7 16 23 5 8 19 11 16 11 7 8 6 11 16 030 21 32 11 13 16 29 3 4 30 1 2 42 29 11 16 30 7 16...

Page 3: ...bserved when handling refrigerants Wear safety glasses and gloves to prevent personal injury During normal system operation some components are hot and can cause burns Rotating fan blades can cause pe...

Page 4: ...NNEL SHOULD PERFORM ELECTRICAL TROUBLESHOOTING Troubleshooting chart for the 38TN Air Conditioner units is provided at the back of this manual It will enable the service technician to use a systematic...

Page 5: ...connect leads and apply low voltage power to contactor coil This may be done by leaving high voltage power to outdoor unit off and turning thermostat to cooling Check voltage at coil with voltmeter Re...

Page 6: ...is called a positive temperature coefficient PTC or thermistor See Fig 7 It is a resistor wired in parallel with the run capacitor As current flows through the PTC at start up it heats up As PTC heats...

Page 7: ...er has power Do not touch heater Carefully feel area around crankcase heater If warm crankcase heater is probably functioning Do not rely on this method as absolute evidence heater is functioning If c...

Page 8: ...the same manner as low pressure switch Observe all safety precautions Step 9 Fan Motor Fan motor rotates the fan blade that either draws or blows air through outdoor coil to perform heat exchange Moto...

Page 9: ...amped on compressor nameplate If compressor draws locked rotor amps and all other external sources of problems have been eliminated compressor must be replaced Because compressor is a sealed unit it i...

Page 10: ...a compressor fails to start or run 3 tests can help determine the problem First all possible external causes should be eliminated such as overloads improper voltage pres sure equalization defective ca...

Page 11: ...with refrigerant Indoor piston or TXV must be cleaned or replaced Remove and discard liquid line strainer and filter drier After system is reassembled install liquid and suction line R134A filter drie...

Page 12: ...light In all instances when a leak is found system charge must be bled down and leak repaired before final charging and operation After leak testing or leak is repaired evacuate system reclaiming refr...

Page 13: ...seat suction valve NOTE All outdoor unit coils will hold only factory supplied amount of refrigerant Excess refrigerant such as in long line applications may cause unit to relieve pressure through int...

Page 14: ...in suction gas returning to compressor The accumulator stores liquid and allows it to boil off into a vapor so it can be safely returned to compressor Since a compressor is designed to pump refrigera...

Page 15: ...ng is the process of charging refrigerant in a system until the temperature superheat of the suction gas entering the compressor reaches a prescribed value Small variations of charge affect suction ga...

Page 16: ...top cover See Remove Top Cover in Cabinet section of the manual Table 1 Superheat Charging Table OUTDOOR TEMP F INDOOR COIL ENTERING AIR TEMP F WB 50 52 54 56 58 60 62 64 66 68 70 72 74 76 55 9 12 14...

Page 17: ...erating cycle trouble shoot to find the cause and correct REFRIGERANT CIRCUIT 1 Check the refrigerant charge using the superheat or subcooling method whichever is applicable and if low on charge check...

Page 18: ...T LOSS OF CHARGE CONTACTOR OR COIL DEFECTIVE LOOSE ELECTRICAL CONNECTION CONTACTOR CLOSED COMPRESSOR POWER SUPPLY OPEN LOOSE LEADS AT COMPRESSOR FAULTY START GEAR 1 PH OPEN SHORTED OR GROUNDED COMPRES...

Page 19: ...19...

Page 20: ...46231 33058c Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 1 2 Tab 3a 5a 1a PC 101 Catalog No 5...

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