Potential Relays – What Happened to Terminal 3?

Potential relays also known as voltage relays are used in capacitor-start capacitor-run (CSR) motors. CSR motors have very high starting torque but run efficiently once started. The potential relay’s only function is to assist in starting the motor. Once the motor has started, the potential relay is no longer in the circuit. We often see…

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HVAC Simulator – HVAC Training

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Don’t Forget Our Google Hangout Tonight – 8:00 PM EST

Just Click HERE Around 7:55 PM – We’ll Start Right At 8:00 I’m excited to share a some new and exiting things that we have going on this year. I don’t want to spoil the surprise, but I am going to try something I have never done before on our Hangouts. I also have an…

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How to Check a Compressor

Checking the Resistance of a Good Compressor Compressor Shorted Windings Resistance Measurements Resistance Measurements Grounded Compressor Restistance Measurements on an Open Winding

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Condenser Fan Cycling Controls

Most condensing units, both residential and for refrigeration have an outdoor ambient design temperature between 60° and 100°. When the outdoor temperature falls below 60° the condensing pressure begins to fall to a point where the metering device fails to operate properly. When in the cooling mode, TXVs require a minimum pressure drop between inlet…

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