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Thread: TEV "Sticking" Power element.
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05-08-2009, 08:36 PM #1
TEV "Sticking" Power element.
Hi Guys.
Today I had a problem with a TEV sticking where on a correctly charged system.
The Suction Pressure and Saturated Suction Temp
Continued to drop!
Eventually causing the system to shut down as it reached it's Low Saturated Suction temp setting.
Having confirmed a fully loaded comp and a full sight glass with no flashing.
I came to the conclusion there was an issue with the expansion valve.
Here's the question.
To resolve the problem I applied some heat to the power element (where the capillary line meets the body).
As I did this both the suction pressure and sat suc temp started to rise.
I was then able to adjust the expansion valve to raise both the pressure and temp!
Prior to this adjustment had had little or no effect.
So given I have heard tales of power element blockages be it gas or water vapour, causing them!
And as I have had success using the heat trick before.
Could these "causes" be true?
Or has anyone got a better explanation?
Cheers Grizzly
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