CSR-20 & CSR-40, September 1999
Condition Possible Cause Remedy
Compressor does not Controller ON; unit start Wait up to 2 minutes for compressor
operate — no amperage sequence still timing start-up
draw
No power to unit (condenser and Check and repair: power source,
evaporator fans do not operate) power plug, CB1 main circuit breaker, motor
contactor, motor terminals, motor
Open in 24 Vac Check fuses and On/Off switch. Replace or
control circuit repair as required
Container temperature does not Adjust controller setpoint
demand unit operation
Compressor contactor inoperative Replace compressor contactor
No output signal from controller Diagnose and replace output module or
output module controller
Unit on defrost Turn unit On/Off switch OFF and ON again
Defective high pressure cutout switch Replace high pressure cutout switch
Refrigerant overcharge or high Check for restricted filter drier or high side,
side restriction causing cycling and refrigerant overcharge
on high pressure cutout
Inefficient condenser operation Check condenser airflow, condenser
causing cycling on high pressure fan motor, fan blade, condenser grille,
cutout condenser coil temperature sensor, water
pressure switch (option), water flow rate
(option) and water-cooled condenser-
receiver tank (option)
Mechanical Diagnosis
8 Mechanical Diagnosis
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