GB.COOLDXS.INS.100507
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8 Trouble shooting and leakage tracing
8.1 Troubleshooting Schedule
Symptom
Possible cause
Remedial measure
Compressor is not operating
The voltage has been isolated.
Incorrect phase sequence.
The compressor safety circuit has been broken.
Defective cooling compressor.
Check the operating/safety switch. Check the condi-
tion of the fuses.
Check and change the phase sequence.
Check, reset if needed.
Replace the compressor.
Too low cooling capacity
The voltage has been isolated.
Incorrect phase sequence.
No airfl ow or too low airfl ow across the evaporator.
Thermostat/control equipment incorrectly set or
defective.
Check the operating/safety switch. Check the condi-
tion of the fuses.
Check and change the phase sequence.
Check the airfl ow.
Adjust the setting or replace faulty components.
The low pressure switch is swit-
ching off the cooling compressor
Inadequate refrigerant.
No airfl ow or too low airfl ow across the evaporator.
Defective evaporator
The expansion valve is defective.
The high pressure switch is defective.
The cooling system is leaking. Tighten the leak and
charge with refrigerant.
Check the airfl ow.
Check, replace.
Check, replace.
Check, replace.
The high pressure switch is swit-
ching off the cooling compressor
No airfl ow or too low airfl ow across the condenser.
Excessively high ambient air temperature
The high pressure switch is defective.
Check the airfl ow (condenser coil and fan).
Check the ambient air temperature.
Check, replace.
Signifi cant freezing on the
evaporator.
The expansion valve is defective or incorrectly set.
No airfl ow or too low airfl ow across the evaporator.
Defective air cooler
Check. Replace or adjust setting.
Check the airfl ow.
Check, replace.
8.2 Leakage Tracing
Leakage tracing should be carried out at least once per
year as a precaution. The leakage tracing inspection must
be documented.
If the cooling system is leaking, this will become apparent
fi rstly by impaired cooling performance, or if the leakage is
substantial, when the cooling unit does not operate at all.
If you suspect that the cooling system is leaking refriger-
ant, check the level of refrigerant in the sight glass located
on the liquid line of the cooling unit.
If you see continuous and a substantial amount of bub-
bling in the sight glass and the cooling unit operates at ap-
preciably lower capacity than normal, the system is prob-
ably leaking. One or several bubbles appearing when the
cooling unit is started up, operation at reduced capacity or
normal operation need not necessarily indicate a refriger-
ant defi ciency.
If it is bubbling in the sight glass and the cooling unit
operates at appreciably lower capacity, call for qualifi ed
service help.
N.B.! Maintenance work in the refrigerant system is per-
mitted to be carried out only by an accredited inspectorate
(a company with requisite authorisation).
