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8. TROUBLE SHOOTING AND LEAK-
AGE TRACING
8.1 Troubleshooting Schedule
Symptoms
Compressor is not operating
Too low capacity
The compressor switches off
because the low pressure sensor
has measured an excessively low
value.
The compressor switches off
because the high pressure sensor
has measured an excessively high
value.
Significant freezing on the
evaporator.
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 system is leaking, this will become apparent firstly
by impaired performance, or if the leakage is substantial,
when the system 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 heating circuit's electrical equipment cubicle.
If you see continuous and a substantial amount of bub-
bling in the sight glass and the reversible heat pump
operates at appreciably lower capacity than normal, the
system is probably leaking. One or several bubbles appear-
ing when the chiller is started up, operation at reduced
capacity or normal operation need not necessarily indicate
a refrigerant deficiency.
If it is bubbling in the sight glass and the chiller operates at
appreciably lower capacity, call for qualified service help.
NOTE! Maintenance work in the refrigerant system is per-
mitted to be carried out only by an accredited inspectorate
(a company with requisite authorisation).
14
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Possible cause
The voltage has been isolated.
Incorrect phase sequence.
The compressor safety circuit has been broken.
Defective compressor.
Leakage, inadequate refrigerant.
The voltage has been isolated.
No air flow or too low air flow across the evaporator.
Thermostat/Control equipment incorrectly set or defec-
tive.
Inadequate refrigerant.
No air flow or too low air flow across the evaporator.
The expansion valve is defective.
The low pressure switch is defective.
No air flow or too low air flow across the condenser.
Excessively high exhaust air temperature.
The high pressure sensor is defective.
The expansion valve is defective or incorrectly set.
No air flow or too low air flow across the evaporator.
GB.RXHCF.191011
Action
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.
Leak test, fill with refrigerant if necessary.
Check the operating/safety switch. Check the condi-
tion of the fuses.
Check the air flow.
Adjust the setting or replace faulty components.
The cooling system is leaking. Tighten the leak and
charge with refrigerant.
Check the airflow.
Check, replace.
Check, replace.
Check the air flow.
Check the exhaust air temperature.
Check, replace.
Check. Replace or adjust setting.
Check the air flow.
We reserve the right to alter specifications.
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