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Maintenance Service and Troubleshooting
a. decrease of gas discharge pressure,
b. lower temperature of discharged gas and of the clogged area, and,
c. in severe cases, condensation or frosting may appear.
Solution
Purge tubing and replace the dry filter with a new one or clean it thoroughly.
Recharge the system with refrigerant and seal the charging port.
B. No Refrigerating
When the compressor runs normally, but little to no frost appears on the
evaporator and the refrigerator temperature does not lower, this is termed "no
refrigerating." There are many causes for this problem, and it can be complicated
to determine. In servicing, special attention should be given to discover the cause
of the problem. Some common causes for this malfunction are analyzed below:
1. Entire refrigerant has leaked out
Analysis of Problem
If leak points in the refrigerating system have not been found and repaired in
a timely manner, this can result in the refrigerant completely leaking out. There
are two kinds of leakage:
a. Slow leakage: When a refrigerator has not been used in a long time, the
refrigerant might gradually leak out. If in the course of operating the
refrigerator it gradually becomes not as cold as normal and, eventually,
does not refrigerate, there is a slow leakage.
b. Fast leakage: All of the refrigerant escapes swiftly from a rupture in
system tubing.
Symptoms of total leakage of refrigerant are as follows:
a. the compressor can be easily started (if there is no damage to the
compressor parts),
b. the operating current decreases,
c. the gas suction pressure increases,
d. the discharge pressure decreases,
e. the gas discharge tube is cold,
f. no sound of gas flow in the evaporator can be heard, and
g. no gas escapes out of the process tube after cutting it open.
Solution
Check the whole appliance, particularly locations which are prone to leak.
After leak point(s) have been found, repair or replace with new parts, according
to specific circumstances, and then empty the system to recharge refrigerant.
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