Thermo King CRR-20, Руководство по обслуживанию

Страница: 155 / 200

CRR-20 & CRR-40, September 1999
Diagnosis Refrigeration Diagnosis 8-5
Condition Possible Cause Remedy
Unit operating in a vacuum Shortage of refrigerant Repair leak and recharge
(unit not cooling)
Compressor motor contacts frozen Clean points or replace contactor
NOTE: When the unit is in
Modulation Cool or the
Compressor inefficient Check valves and pistons
return air temperature is
below -18 C (0 F), the
Defective liquid line solenoid valve Repair or replace liquid line solenoid valve
suction pressure will be
less than 0 kPa, 0 bar,
Partial obstruction in low side or Locate obstruction and repair
0 psig during normal dehydrator
operation
Iced or plugged evaporator coil Defrost or clean evaporator coil
Expansion valve partially closed by Clean or replace expansion valve
ice, dirt or wax
Expansion valve power element lost Replace expansion valve
its charge
Defective container insulation Correct or replace container insulation
Poor fitting container doors Repair or replace doors
Partial obstruction in high side Locate obstruction and repair
Service gauge out of calibration Replace service gauge
Evaporator pressure regulator (KVQ) Repair or replace valve
valve stuck closed or defective
Controller out of calibration or Recalibrate or replace controller
defective (see Diagnosis Manual for Thermoguard
µ
P-D Microprocessor Controller, TK 41230)
Expansion valve feeler bulb Correct feeler bulb installation
improperly mounted, poorly insulated
or making poor contact
Refrigeration Diagnosis