Profroid COPELAND Notice D'instructions page 24

TROUBLESHOOTING
Examples of faults
FAULT PROBABLE CAUSE
1. Suction Too much suction gas superheat
Temperature too (above 20K)
high
Liquid in the suction line.
2. Suction
Temperature too Sensor bulb is loose or incorrectly positioned.
low
3. Suction Too much oil in evaporators.
Pressure too low Filter in the fluid line clogged.
Suction filter blocked.
Too much superheat of suction gas.
Thermostatic expansion valve blocked when in
closed position.
Problem with solenoid valve in the liquid line.
Installation insufficiently charged.
4. Compressor cuts See point 3
in and out too Low pressure safety switch set too high.
Evaporator iced over or frozen water present in
often on LP safety
switch the distributor.
5. Suction Restart after defrost.
Pressure too high Compression problems
6. Condenser Insufficient flow of air in to the condenser (if
air cooled condenser)
Pressure too high
Fan cut-in not adjusted
High pressure safety valve set too low
Installation flooded
Air or non-condensable gas in the HP circuit
7. Condenser Fan cut-in incorrectly set.
pressure too low
8. Discharge Too much superheat on suction.
Temperature too Compression problems.
high
9. Oil temperature Superheat on suction too great.
too high Valve problems.
10. Oil Crankcase heater out of order.
temperature too Oil return saturated in liquid refrigerant
low
11.
Problem with control system or other automatic
Capacity too
great
device.
12.
Capacity Problem with control system or other automatic
insufficient device.
13. Oil foams Thermostatic expansion valve (fluid in suction
line).
heavily after
Bulb loose or incorrectly positioned
stoppage
Crankcase heater out of order
ACTION REQUIRED
Examine and adjust the thermostatic expansion
valves in the evaporators.
Adjust thermostatic expansion valves.
Check if the bulb is in contact with the suction line
and replace if necessary
Drain oil from evaporators.
Examine and clean filters in liquid line.
Check suction filter.
Adjust thermostatic expansion valves.
De-ice thermostatic expansion valve using warm
rags. If no improvement, change the thermostatic
expansion valve.
Check wiring and coil – replace if necessary
Charge the installation with refrigerant.
Adjust pressure safety switch.
Clean or defrost evaporator.
Wait for confirmation
Change compressor
Clean condenser. Check motor fans or water supply.
adjust
Set pressure valve at maximum 1 bar below
Maximum Safe Pressure, but take into account the
compressor limit.
Drain liquid into receiver
Let air out at highest point.
Adjust pressure switch
Adjust thermostatic expansion valves.
Change compressor
Check and adjust thermostatic expansion valves
Check pressures
Replace heater
Adjust thermostatic expansion valve
Replace, repair or reset
Replace, repair or reset
Check thermostatic expansion valve.
Check bulb position
Replace heater
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