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Diagnosis: Troubleshooting, Status Messages, Alarm Codes
157
Compressor contactor burned
out
Low line voltage
Increase line voltage to at least 90
percent of compressor motor rating
Excessive line voltage
Reduce line voltage to at least 110
percent of compressor motor rating
Short cycling
Eliminate cause of short cycling
Unit short cycles
Refrigerant overcharge causing
cycling on high pressure cutout
Purge system
Inefficient condenser operation
causing cycling on high pressure
cutout
Check condenser airflow,
condenser fan motor, condenser fan
grille, condenser fan pressure
switch, water pressure switch
(option), water flow rate (option) and
water-cooled condenser-receiver
tank (option)
Noisy compressor
Loose mounting bolts
Tighten mounting bolts
Oil slugging or refrigerant flooding
back
Perform controller pretrip test to
check refrigerant charge. Check
expansion valve adjustment. Check
compressor for compressor oil.
Scroll rotating backwards
Check phase correction system and
check unit wiring
Defective compressor
Repair or replace compressor
Condenser fan motor does not
operate
Unit in Heat or Defrost
Check indicator lights. If unit is in
Heat or Defrost, unit operation is
normal (no remedy required)
Unit in Cool with Low condenser
temperature
Check indicator lights condenser
temperature and discharge
pressure. Condenser temperature
may not require condenser fan
operation (no remedy required;
condenser fan also pulses on and
off on a 30 second cycle to control
condenser temperature)
Water pressure switch Closed
(Water-cooled position) (Option)
If unit is on water cooled condenser
operation, unit operation is normal.
Otherwise water pressure switch
must be Open for air-cooled
condenser operation.
Defective water pressure switch;
(option)
Replace defective switch
Loose line connection
Tighten connections
Open motor internal thermal overload
protector
Check for seized bearings or
defective thermal overload
protector. Repair or replace as
necessary
Defective motor
Replace motor
Detective condenser fan contactor
Replace defective contactor
No condenser fan output signal from
controller
Diagnose and replace condenser
fan relay, main relay board or
controller
Condition
Possible Cause
Remedy
Содержание 098916
Страница 2: ...MAGNUM TK 51122 4 MM Rev 6 02 06 Copyright 2004 Thermo King Corp Minneapolis MN USA Printed in USA...
Страница 5: ......
Страница 11: ...Table of Contents 10...
Страница 19: ...Service Guide 18...
Страница 28: ...Specifications 27 Figure 2 Physical Specifications AMA313...
Страница 41: ...Unit Description Features Options 40...
Страница 105: ...Operating Instructions 104...
Страница 155: ...Servicing The Unit 154...
Страница 187: ...Index 186...
Страница 189: ...Wiring and Schematic Diagrams Index 188...
Страница 190: ...189 Wiring Schematic...
Страница 191: ...190 Wiring Diagram Page 1 of 2...
Страница 192: ...191 Wiring Diagram Page 2 of 2...