Get Tech Tips
Subscribe to free tech tips.
Get an EEV Open (Like Magic)
This tech tip comes from our contributor, compressor decapitator, and super tech Ulises Palacios.
Many ductless systems and some high-efficiency unitary systems have electronic expansion valves.
If you find one that is stuck closed, you may be able to get it open temporarily by putting a strong magnet like the one shown above on the valve body and turning it counterclockwise.
This is likely only temporary, so valve replacement is still needed. However, it can help get the customer's equipment running while you wait to get a new valve.
Pretty cool, Ulises.
P.S. – if you have any videos or tech tips, you can tag me with them, post them in the HVAC School FB group or email them to email@example.com.
Related Tech Tips
Market Refrigeration TXV Adjustment
This quick article was written by market refrigeration tech Clayton Peeples. Thanks, Clayton! Adjusting the TXV should be done last after checking all other causes of the case being warm or floodback on the rack. TXVs very rarely go bad; generally, it's a dirty screen or a failed powerhead, both of which can be addressed […]Read more
Relative Humidity in the Supply Air Stream
When you first start checking your supply air with a thermo-hygrometer, you may notice that the relative humidity is REALLY HIGH. Often, the RH in a supply duct will be between 85% and 96% relative humidity on a system that is functioning as designed. The reason for this is fairly simple: In order for dehumidification […]Read more
Refrigerant Charging Basics For Air Conditioning & Heat Pump Systems
Before I start on this one… At HVAC School, we focus on a wide range of topics. Many of them are very basic. My experience as a trainer for over 16 years has taught me that no matter what I assume others SHOULD know, it doesn't change the fact that they often do not. This […]Read more