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CRR-20 & CRR-40, September 1999
Diagnosis
Refrigeration Diagnosis
8-7
Condition
Possible Cause
Remedy
Head pressure too low
Shortage of refrigerant
Repair leak and recharge
NOTE: This unit has a
Low ambient air temperature
No remedy
suction modulation
capacity control system.
Service gauge out of calibration
Replace gauge
Suction and discharge
pressures may drop below
Compressor suction or discharge
Clean or replace leaking valve plates
expected normal readings
valve inefficient
when the unit is in
Modulation Cool (control
temperature within 10 C
[18 F] of setpoint or
in Power Limit mode).
Head pressure too high
Refrigerant overcharge
Purge system
Air in refrigeration system
Evacuate and recharge
Dirty or restricted condenser coil
Clean condenser coil
Defective condenser fan pressure
Replace switch
switch
Defective water pressure switch
Replace switch
(Option)
Insufficient water flow rate or
Correct water flow rate or clean/replace
plugged water-cooled
condenser-receiver tank
condenser-receiver tank (option)
Condenser fan not operating
See “Condenser fan motor does not
operate” under Mechanical Diagnosis
Condenser fan grille damaged or
Repair or replace grille
missing
Condenser fan blade damaged
Replace fan blade
High ambient air temperature
No remedy
Restricted dehydrator or high side
Replace dehydrator or clear restriction
Defective high pressure gauge
Replace service gauge
Содержание CRR-20
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