Service Stem Valves, Moisture Contamination

The water regulating valve must close off condenser water flow completely during the “hot gas”harvest cycle. There should be no discharge water flowing out of the condenser during the harvest cycle. Should the valve fail to close during the harvest mode, the condenser will continue to condense the compressor discharge vapor needed for the harvest cycle and this will result in long harvest times.

Leaking (bypassing) water regulating valves are normally the result of scale build-up on the valve diaphragm and the valve should be flushed, not replaced. To flush the valve, open the adjusting stem wide open CCW (or force the valve spring up with a screwdriver), open and close the water supply to the condenser resulting in the flushing action. Should this not correct the problem, replace the valve diaphragm. This can be done without en- tering the sealed refrigeration system.

Damage to the water regulating valve may also be caused by water hammer. Water hammer will result from the condenser inlet and outlet water lines being reversed or defective valve stops in the water supply line. Proper installation of water--cooled equipment should always include an anti-water hammer standpipe in the supply inlet line as close to the cuber as possible.

SERVICE STEM VALVES

When closing the service stem valves to remove your gauge and manifold set always close the high side stem valve first. Following this procedure will allow the system to “PULL”the refrigerant vapor from your manifold set to reduce refrigerant loss. When the pressure has been reduced, close the low side stem valve.

MOISTURE CONTAMINATION

With the major changes in refrigerants in today’s marketplace and the use of hydroscopic oils the control of moisture and contaminates have become more critical to safeguard against than ever before in the history of mechanical refrigeration.

Contaminates are also the most difficult of all problems to determine. A Meg-Ohm meter “Megger”can be a valuable tool to aid in the analysis of this problem. A Meg-Ohm reading log may be started any time after 90 days of operation of the product. To perform the test, proceed as listed.

Disconnect all three (3) compressor leads, take a Meg-Ohm meter reading from each compressor terminal to a good chassis ground. Compare reading to chart below:

Meter Reading	Compressor Condition	Maintenance Required
Meg-Ohm

100 - ¥	Okay	None needed.
100 - ¥
50 to 100	Moisture present	Replace drier.
20 to 50	Severe moisture & possible con-	Replace drier with acid hold type.
	taminated oil with acid present	Run 24 hours, change to regular
		drier.
.5 to 20	System has severe contamination	Remove compressor oil and refrig-
		erant charge. Evacuate, install liq-
		uid and suction line driers (acid
		hold type). Recharge with new oil

and refrigerant. Run 24 hours. Dis- charge system, discard suction line drier, replace the liquid line dri- er. Evacuate and recharge.

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322 specifications

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