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- Water accumulates and gradually clogs the narrow part of the capillary,
- Frost to melt at the evaporator, there is no sound of gas flowing,
- The gas suction pressure becomes a vacuum.
Note that these phenomena will appear intermittently. In order to know whether the system
is clogged with ice, heat the parts that are suspected with hot water. If the sound of gas
flowing is heard and the gas suction pressure rises, the trouble is that the system is
clogged by ice.
Remedy
If there is too much moisture in the refrigerating system, release the refrigerant, purge the
tubing with nitrogen, and then refill the system with the filtered refrigerant. Another method
is to connect a filter with moisture absorbers, such as silica gel or anhydrous calcium
chloride, to the refrigerating system. Next, replace the filter, evacuate it again, and fill the
system with refrigerant.
3) Refrigerating system is clogged with dirt
Analysis of Trouble
Coarse-grained dirt and refrigerant oil in the system tend to settle and clog the capillary
inlet. Flow of refrigerant stops when the filter screen is completely clogged by dirt. This
condition has the same symptoms as when the refrigerating system is clogged by ice.
However, when you heat the clogged area with a hot towel, there is no reaction. After
rejecting the possibility of ice clogging, it can be concluded that the clogging is due to dirt.
Remedy
Dismantle the system. Remove the dry filter and purge the tubing with nitrogen. Next, install
a new filter. Then evacuate it and fill with refrigerant.
4) Clogged filter
Analysis of Trouble
The complete clogging of the filter rarely occurs. Oftentimes, there is an accumulation of
paste-like matter formed from dust on the filter. Tapping the filter may remove part of the
paste-like matter. When the filter is clogged, it will be cooler than normal.
Remedy
The same as described for the capillary clogged with dirt.
• Troubles of Compressor
1) Broken gas suction and discharge valve blocks
Analysis of Trouble
The compressor works by opening and closing the gas suction valve and discharge valve
to suck and discharge the refrigerant. If the valve block is broken, the refrigerant cannot be
discharged. This prevents refrigeration.