iom-clicsa-cf-eng
www.clima-flex.com
54
Troubleshooting Chart
Problem
Possible causes
Possible corrective actions
Low suction
pressure.
Dirty evaporator.
Backwashing or chemical cleaning.
Lack of refrigerant.
Check for leaks, repair and add the necessary charge.
Check liquid sight glass.
Low water flow.
Adjust the water flow required for the equipment.
Expansion valve malfunction or failure.
Check or replace (if necessary) the valve and adjust the proper
superheat.
Solenoid value not open.
Check circuit and possible problem of solenoid valve not opening,
if necessary replace.
Liquid line filter drier fouled.
Check pressure drop or temperature for diagnostics.
Condensing temperature too low.
Check means of regulating condenser temperature.
Excess oil used.
If the system has excess oil, recover and adjust by observing the
sight glass on the compressor.
Motor overload
relays or circuit
breakers open.
Voltage unbalance or out of range.
Correct power supply.
Faulty or grounded wiring on motor.
Check electrical circuit for possible problem. Then replace
compressor.
Loose power wiring or faulty contactors.
Check all connections and tighten, if necessary replace contactors.
High condenser temperature.
See corrective steps for high discharge pressure.
Compressor
thermal
protection switch
open.
Operation beyond design conditions.
Correct to bring conditions within allowable limits.
Voltage range or unbalance.
Check and correct.
High overheating.
Set correct superheat. Check for possible problem. Then replace
the compressor.
Short cycling.
Check and stabilize load or correct control settings for the
application.
