Sources of moisture
1.During reefer charging moisture can enter
2.Leakages in the system
3.During oil charging moisture can enter
Symptoms
1.Moisture may freeze at the expansion valve, giving some of the indication of under charging.
2.It will contribute to the corrosion in the system.
3.It may cause lubrication problems and breakdown of the lubricating oil in the refrigerant compressor.
4.Starving of evaporator and rapid condenser pressure rise cause compressor short cycling.
5.Frost at expansion valve inlet.
Remedy
1.Find out the source and rectify
2.Renew drying agents of dehydrator.
moisture indicator
A moisture indicator is located either
in the liquid refrigerant line or built into the dehydrator.
The moisture
indicator contains a chemically treated element that changes color when there
is an increase of moisture in the refrigerant. The color change is reversible
and changes
back to a DRY reading when the moisture is removed from the
refrigerant. Excessive
moisture or water will damage the moisture indicator
element and turn it gray, which
indicates it must be replaced. In an operating
refrigeration system low on refrigerant, a liquid
line sight glass will show
bubbles.
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