Commercial Refrigeration – Walk-in Cooler Operation

The refrigeration cycle for medium temperature walk-in coolers is exactly the same as residential air conditioning systems. However, the operation of the physical components is slightly different. All of the walk-in cooler configurations below have this in common: The compressor is energized by a potential relay. The condenser fan is wired in parallel with the…

Continue Reading →

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‚Äôs 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…

Continue Reading →

HVAC Simulator – HVAC Training

Continue Reading →

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…

Continue Reading →

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

Continue Reading →