Low-Voltage Troubleshooting in the HVAC Industry

Hello and welcome back to Arzel zoning, where we provide the most reliable damper product to enhance comfort in your home and small business. We’re doing a series of troubleshooting videos, and we want to help technicians become more confident with diagnosing our Hvac outputs. Although rare, you may run into a problem where there could be a faulty relay, and we want you to have the confidence to diagnose that every now and then.

And it’s really a pretty rare instance. You might have a faulty relay on the board to diagnose that we’re going to be checking for resistance. We covered using the blue screen in another video. And we can look on this output line that we have. W1 w2 y1 y2 for the air handler and condenser. And we have a g and a b terminal.

We have this set up to energize reversing valve and heating so we can test that relay. One of the best features about the HeatPumPro is that you can use a single stage heat cool thermostat, and that’ll control any equipment configuration you have two stage air conditioning, two stage heat pump, electric backup, dual fuel, and it’s going to cycle through.

If you have an all electric system with a two stage heat pump and two stages of back. This will provide you with four stages of heat with just a single stage thermostat. So when we’re testing the relays, we look at the output line on our home screen and we take a look, see what outputs are available. We disconnect the R wire from our furnace.

We put our probes in just behind the orange clips, and we check for resistance. We can see that we have 0.2 resistance and that tells us we have a good relay. We continue on to the next terminal. So we tested our W1. Now we test our W2. We have good resistance Y1 air handler y2 air handler y1 condenser y2 condenser g and o/b.

So we know that all those relays are good. We know the Arzel panels working correctly. And if our Hvac equipment is not coming on, the fault is with our Hvac equipment or the wire running between the Arzel panel and the furnace. If you do have an open relay, and we can do that by testing one that was not calling at this time, you’re going to read.

OL that’s an open circuit. If you have a faulty relay. Although again, it is rare you’ll be reading greater than one ohm of resistance. Double check it a couple ways. Stick your probes in where the wire openings are. Stick your probes into this little half circle. Just make sure your meter probes are getting good contact and give us a call.

If you do have any trouble. Thank you for watching. If you do have any trouble or if you have questions about warranty, give us a call at (800) 611-8312. Again, that’s (800) 611-8312.