Arkansas HVACR NewsMagazine March 2020

S tate, National, Chapter News Tech News

because he has a ton of experience on these freezers. If he didn’t then the first course of action would be to do a bit of reading up on the manufacturer’s site or app so that you have the basics before proceeding.

REFRIGERATION EQUIPMENT DIAGNOSIS METHOD

So let’s ex plore everything Chris found and how he found it

Bryan Orr

• Failed door seal • Dirty Condenser Coil • Frozen Evaporator Coil • Defrost Heater inoperable • Failed Defrost Limit

The main thing wrong with this machine is a failed defrost limit but Chris was able to diagnose the problem quickly because he used these skills of perception – • Cycling a defrost mode (prior knowledge of the equipment or reading the manual) • Noticing how quickly the suction line froze (visual and touch) • Visual observation of the frozen coil (visual) • Looking at the wiring diagram to find the circuit (Diagram reading) • Testing for voltage to the defrost heater (electrical diagnosis)

I was watching this video on the HVACR Videos channel by my friend Chris Stephens and I was impressed by how completely he diagnoses the system both visually and with his tools. Take a look. I say this all the time, but a good, efficient technician is one who sees everything and can also quickly diagnose the main thing. First off… and this isn’t shown in the video. Chris knows what type of appliance this is, what sequence of operation it runs in and how the controls work. He likely knows all of this