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Maintenance Service and Troubleshooting
may occur as well. Meanwhile, condensation may occur on the gas return tube,
and the gas discharge pressure will rise. When it reaches the maximum value,
the protective relay will activate and shut off the compressor.
Solution
Open the tubing, evacuate, and charge the system with the proper quantity of
refrigerant.
1b. Air left in the system
Analysis of Problem
Residual air in the system will circulate with the refrigerant in the system. The
major symptoms caused by this problem are poor refrigerating effect, higher gas
discharge pressure, and higher discharged gas temperature (the gas discharge
tubing is considerably hot). The gas discharge pressure will exceed its normal
value when the compressor has run for an extended period of time, thus making
the protective relay activate and shut off the compressor.
Solution
Exam how the air was left in the refrigerating system. Generally, there are
three possibilities:
i. the air was sucked into the system during a careless repair,
ii. it was not completely purged when evacuating the system, or
iii. there are leak points at the low-pressure end of the refrigerating
system. Leak points appear mainly in low-temperature parts
because the evaporation temperature is lower in low-temperature
devices; it is easier for air to enter the system in such areas.
Once it has been determined that air is in the system, open the tubing,
evacuate it, and charge it with refrigerant.
2. Broken due to electrical issues
2a. Thermostat is out of order
Analysis of Problem
If the thermostat is not in good working order or its temperature sensor has
been installed improperly, frequent stopping is likely to occur.
Solution
Try to adjust the temperature sensor's position until the compressor can be
started and stopped normally. If this cannot be achieved and the compressor
continues to suddenly stop, it is most likely that the mechanical parts or contacts
are out of order. Therefore, disassemble the thermostat, make a thorough
checkup, and repair it.
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