Thermo King CRR-20, Руководство по обслуживанию

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CRR-20 & CRR-40, September 1999
Diagnosis Refrigeration Diagnosis 8-9
Condition Possible Cause Remedy
High suction pressure Overcharge of refrigerant Purge system
Expansion valve open too much Adjust or replace valve
Controller out of calibration or Recalibrate or replace controller
defective (see Diagnosis Manual for Thermoguard
µ
P-D Microprocessor Controller, TK 41230)
Service gauge out of calibration Adjust or replace service gauge
Low suction pressure Shortage of refrigerant Repair leak and recharge
NOTE: This unit has a Low ambient air temperature No remedy
suction modulation
capacity control system.
Iced or dirty evaporator coil Defrost or clean evaporator coil
Suction and discharge
pressures may drop below
Restricted lines Locate and clear restriction
expected normal readings
when the unit is on
Plugged dehydrator or in-line filter Replace dehydrator or in-line filter
Modulation Cool (control
temperature within 10 C
Expansion valve closed too much Adjust or replace valve
[18 F] of setpoint or
in Power Limit mode).
Expansion valve feeler bulb Correct feeler bulb installation
improperly mounted, poorly insulated
or making poor contact
Evaporator fans off Check evaporator fan motors and control
circuit and correct fault
Controller out of calibration or Recalibrate or replace controller
defective (see Diagnosis Manual for Thermoguard
µ
P-D Microprocessor Controller, TK 41230)
Service gauge out of calibration Adjust or replace gauge