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Owners Manual
Quantum Energy Technologies
Section 6: MAINTENANCE
6a: General
On initial start-up and periodically during operation, it will be necessary to perform certain routine
service checks.
WARNING
If a system failure occurs due to improper maintenance during the warranty period, Quantum
will not be liable for costs incurred to return the system to satisfactory operation.
6b: Compressor
6b.1: Lubrication Oil
The Oil used in the compressor is clear in colour. If the oil colour darkens or exhibits a change in
colour or there are any particles present, this may be an indication of contaminants in the
refrigerant system. An oil sample should be taken and analysed. The colour of the oil may be seen
from the refrigerant sight glass. If contaminants are present, the system must be cleaned.
6b.2: Operational Noise
The system does produce noise during operation however any unusual compressor noise or heavy
vibrations may indicate a potential problem. A qualified and experienced refrigeration technician
should be familiar with normal compressor noise and would be able to advise if the noise being
produced is abnormal.
6b.3: Frost on Sump
No frost should be present on the sump of the compressor.
6c: Refrigerant Sight Glass
Observe the refrigerant sight glass weekly. A clear glass of liquid indicates adequate sub cooled
refrigerant charge in the system and proper feed through the expansion valve. Bubbling refrigerant
in the sight glass indicates the system is short of refrigerant charge, and the system should have
leak detection carried out to ascertain where the refrigerant is leaking from prior to recharging.
Sub cooling should be verified to prevent overcharging. Refrigerant gas flashing in the sight glass
could also indicate an excessive pressure drop in the line, possibly due to a clogged filter drier or a
restriction elsewhere in the system.
The sight glass will also indicate the moisture condition corresponding to the indicated colour. If
the sight glass does not indicate a dry condition after about 12 hours of operation (shows yellow in
the centre spot), the refrigerant or oil should be tested for moisture. If there is too much moisture
in the system, the refrigerant must be vacuumed from the unit. The oil and the drier must also be
changed, and then new refrigerant added.
Document Number : QDC0049PD-5
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