GB.COOLDX.INST.090301
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8 TROUBLESHOOTING AND
LEAKAGE TRACING
8.1 Troubleshooting Schedule
Symptom
Possible cause
Remedial measure
Compressor is not operating
The voltage has been isolated.
Size 60, capacity variants 2 and 3: Incorrect phase
sequence.
The compressor safety circuit has been broken.
Defective 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.
Size 60, capacity variants 2 and 3: Incorrect phase
sequence.
No airflow or too low airflow across the evaporator.
Thermostat/control equipment incorrectly set or defec-
tive.
Check the operating/safety switch. Check the condi-
tion of the fuses. .
Check and change the phase sequence.
Check the airflow.
Adjust the setting or replace faulty components.
The low pressure switch switches
off the compressor.
Inadequate refrigerant.
No airflow or too low airflow across the evaporator.
The expansion valve is defective.
The low pressure switch is defective.
The cooling system is leaking. Tighten the leak and
charge with refrigerant.
Check the airflow.
Check, replace.
Check, replace.
The high pressure switch switches
off the compressor.
No airflow or too low airflow across the condensor.
Excessively high exhaust air temperature
The high pressure switch is defective.
Check the airflow.
Check the exhaust air temperature.
Check. replace.
Significant freezing on the
evaporator.
The expansion valve is defective or incorrectly set.
No airflow or too low airflow across the evaporator.
Check. Replace or adjust setting
Check the airflow.
8.2 Leakage Tracing
As a preventive measure, the cooling system should be
inspected at least once per year to detect possible leakage.
The leakage tracing inspection must be documented.
If the cooling system is leaking, this will become apparent
firstly 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 deficiency.
If it is bubbling in the sight glass and the cooling unit oper-
ates at appreciably lower capacity, call for qualified 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).