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Thread: Solenoid valve diagnostics
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07-03-2009, 01:31 PM #1
Solenoid valve diagnostics
Hi, I have a commercial refrigerating unit with dual cooling zones, 1 a wrapped cold bn and the other a refrigerator space. The 2 are controlled with txv's and solenoid valves. I believe one of the valves are leaking when closed causing repeated pump don cycles. Is there an easy way to find which solenoid valve is leaking through?
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07-03-2009, 05:11 PM #2
Re: Solenoid valve diagnostics
Check the valve for temperature drop across it, it should be fairly obvious if it is passing!
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08-03-2009, 10:48 AM #3
Re: Solenoid valve diagnostics
Good point from silhouette,you could also.
If individual l.p. switches are fitted?
which I assume is the case?
Try metering out or just watching which of them activates first?
It depends on your systems, but is there not a service port.
Where you can observe the individual rise in pressure?
Grizzly
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08-03-2009, 12:34 PM #4
Re: Solenoid valve diagnostics
thanks guys, I didnt think bout the temp drop from the liquid flashing through the valve. I apreciate it. And only one low pres switch controlling the condenser but a good thought. Thanks Griz
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08-03-2009, 02:16 PM #5
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08-03-2009, 04:29 PM #6
Re: Solenoid valve diagnostics
dual etc's
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08-03-2009, 08:15 PM #7
Re: Solenoid valve diagnostics
If the above diagnostics don't find the offending item, strip the valves and inspect the diaphram faces, if a piece of swarf or simillar has passed thru the valve, then there could be scratches on the teflon surface. The tinyest of scratches can cause the valve to pass. Using a bright light and mag glass will help with inspecting the surfaces. Then replace damaged diaphram and internal parts for an effective repair.
Reality is an elusion created by alcohol deficiency. Quaff and enjoy. [Yorkshire, UK]
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08-03-2009, 10:39 PM #8
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