General Troubleshooting - Conair EP2 series User Manual

General Troubleshooting

Problem
Compressor will not Compressor overload
start
Compressor contactor
Compressor failure
Pump will not start Pump overload
Pump contactor
Pump failure
Low refrigerant Low refrigerant charge
pressure
Refrigerant leak
Low refrigeration pressure sensor
High refrigerant Dirty air filters (air-cooled units only)
pressure
Air flow obstruction (air-cooled units only)
High ambient air temperature (air-cooled units only)
Condenser fan motor (air-cooled units only)
Condenser fan cycling control (air-cooled units only)
Plugged condenser (water-cooled units only)
Insufficient condenser water flow (water-cooled units
only)
High condenser water temperature (water-cooled units
only)
Condenser water regulating valve
Refrigerant circuit overcharged
High refrigerant pressure sensor
Freezestat Low flow through evaporator
Freezestat control module
Freezestat sensor
Low pump discharge Pump running backwards
pressure
Pump pressure gauge
Pump failure
Excessive flow
High pump discharge Closed valves in process piping
pressure
Obstruction in piping or process
Clogged Y-strainer
Pressure gauge
Erratic temperature Low coolant flow through evaporator
control
Intermittent overloading of chiller capacity
Hot gas bypass valve
Temperature sensor
Possible Cause
34
Remedy
Check supply voltage, amperage of each leg, contactor
and wiring, and overload set point
Replace if faulty
Contact Customer Service for assistance
Check supply voltage, amperage of each leg, contactor
and wiring, and overload set point
Replace if faulty
Replace if faulty
Contact refrigeration service technician
Contact refrigeration service technician
Check for proper range, replace if faulty
Clean filters
Make sure chiller is installed in accordance with
recommendations in this manual
Ambient temperature must be reduced below 110°F
Replace if faulty
Confirm proper operation, replace if faulty
Clean out tubes
Make sure chiller is installed in accordance with the
recommendations of this manual
Condenser water temperature must be reduced below
100°F
Check setting, replace if faulty
Contact a refrigeration service technician
Replace if faulty
Adjust flow to proper level
Check for proper setting (Protected Setting)
Replace if faulty
Switch 2 legs of the incoming power
Replace if faulty
Replace if faulty
Reduce flow
Open valves
Remove obstruction
Clean strainer
Replace if faulty
Adjust flow to proper level
Check to make sure chiller is properly sized for process
load
Contact refrigeration service technician
Replace if faulty