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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
Содержание CRR-20
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