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William A Chambers Basic Refrigerant Circuit Course October 1, 2022, 1:44 pm
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Testing, Recovery, and Charging a Sealed System
There are many appliances with compression refrigeration circuits that do not have ports installed for testing, recovery, charging, and evacuation. These can include window units, PTACs, fountains, refrigerators, and much more. This fact presents a challenge any time you suspect or know there is a refrigerant circuit issue. How can you diagnose and repair when […]Read more
DISCLAIMER: HVAC School is NOT an official OSHA safety training resource! Although we provide safety tips in good faith, our website is not a substitute for safety training from an authorized OSHA training source. Locking out and tagging equipment is one of the most basic safety procedures in general industry and maintenance work, especially in […]Read more
Does a Furnace Decrease Humidity?
Does heating the air cause the humidity in the air to decrease? Yes and no. Heating air causes the RELATIVE humidity percentage to decrease, but it does not change the overall moisture content in grains of moisture per lb of air. Many old-timers will swear a blue blaze that oversizing a furnace will directly result […]Read more