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
