Just showed my trainee your illustration. He was having a little issues with my explanation of relays. But after viewing your illustration he is much more confident in the relays. You are the man!
We need to thank the memory of the American scientist Joseph Henry, who is credited for perfecting the relay as we know it (1835). Let's not forget Michael Faraday, the first to rotate a conductor in a magnetic field(AC), the first to invent the electric motor (extremely simple), and the refrigeration cycle as we know it. As Sir Isaac Newton said; "We stand on the shoulders of giants." Greg, thanks for your excellent videos. They are valuable and informative.
Its funny how for me as an electrical student, i learn much better quality stuff (like this video and HOW something actually works) from HVAC guys than I do electrical guys LOL.
I'm a former instructor, semi retired from running service, and still running service, more than I want, to help people that can't afford the big companies and gougers...I was considered a good instructor, this man, is an Excellent instructor...A great video...I Salute you Teach.
Thanks for this wonderful video Craig. I'm an HVAC installer but I'm trying to learn some of those beautiful skills and knowledge you service techs have ;) This helps a lot!
Awesome. Wish I was able to watch this video when I first started 4yrs ago - perfect job of explaining the function visually. I had to make a similar 'test bench' set-up with a transformer and a bunch of different sequencers and relays then spend some time powering them up and ohming them out to get it straight in my head so I was ready to troubleshoot effectively.
This is a great video. I've been Googling a lot since my espresso machine stopped heating up. It has a DPST power relay. Your video is the only one that explains what the ratings are on the side of the relay. And your testing is simple to follow. Thank you very much. 🤠
Great watchin AC Service Tech channel!! Started in 04,was in residential electric,nd hydronic heating even before that . Only had books nd hands on experience back then . When I learned this no one could explain the way CRAIG does. It's a good feeling when I know people are benefiting from this information, keep it up looking for to the next one ✌
That's what I call ,Real explanation ,can you do troubleshooting videos, like most AC, units have, (capacitor, low refrigerant, relays,fans,low air flow etc,
Robert, look up our switches and relays video playlist for many others. We also wrote articles on our website www.acservicetech.com for frozen evap coil, liquid line restriction and others. We put a whole book out on working with refrigerant, ac and heat pump units. In the book we go over the basics all the way through to troubleshooting by measuring the refrigerant charge and troubleshooting airflow problems. The whole outline is posted at www.acservicetech.com/the-book thanks!
I’m new to service work but long time duct installer. Now I understand how they work, Great job of explaining! Now I just have to figure out how to wire them in without blowing something. Could you make a video of that please?
Your videos are always top notch, Thanks for sharing . I was taught that testing resistance while power is on could be damaging to your meter and you have done this throughout the videos. Have i got this wrong
Great videos!!! What I am looking for is help with an old furnace that does not have a fan (G) or a W wire. Y,O,R = Cold, Y,R = hot. There is no fan (G) wire. There is also a B-marked wire. The issue I am having is that after the cold cycle and temperature is reached, something sticks which keeps the heat on. The second problem I seem to have is that if I connect O only the fans run continuously. The new thermostat powers O even when it is not cooling. Also note there is no control board, just wire to wire devices such as a SPST mounted on a metal surface.
Broken relays inside water source heat pumps can be very confusing. But, I found testing each one in sequence understanding what each one does clearly wasn't so bad. Usually they are so common & cheap I just replaced all at once so everything works. A no brainier.
My neighbor's hvac heater seems to light the furnace fine but when the blower comes on you can hear the click then it comes on for a half a second then clicks off then on and does that 15 times then stays on. It's been doing that for years she said. I'm wondering if the relay is going bad or the heat sensor fan control switch could be going bad so not staying closed till the heater keeps getting hotter. When the heat signal isn't being sent from the thermostat the system cycles off but the fan does come back on in the end for a second then back off. It sounds like the fan is ramping up when it starts. The furnace stays lit. What things could this be. I scheduled an hvac guy to come but just so I have an idea.
This is very well done. I have a question. My fan stopped altogether. I ran tests on the fan. all is well. When I tested the relay on the bench it worked great. When I powered it up via the fan "on", both 2-4 & 5-6 turn on simultaneously. I put in a new relay, but the same thing happens. What could be the cause?
Fan motor won’t turn on. Is it because of the relay? I checked for resistance on the motor wires and they check out fine. High voltage is getting to the terminals as well.
so when u plug in the wire into the relay and connect the jumper. reading should be say like 00 or 01 or 2 is good. but when your checking the coil now that’s different. u just use jumper to check ? so that reading should show higher number like 89.? if it low, it’s bad.
The relay on my Goodman is a white Rodgers 134 20102 106 with 14 fla , 84 lra and 7 fla , 42 lra the parts store don’t have this so they sold me a supco 90290 with 8 fla and 25 lra. Is this a suitable replacement? Thank you.
Marcel, I was just mentioning the same troubleshooting problems that relays have, boards have too. If control voltage is going in and power is not making out of the relay then the relay on the board is bad, thanks!
Yes, if it is an x-13 which has a built in control board. There is a low voltage signal wire going to motor if it is x 13, disconnect low voltage speed control wire. If it continues to run than the motor is bad. If it is a motor that has a capacitor connected to blower housing, than no, it is not a bad motor, just one that has a bad control circuit somewhere. Whenever touching wires always disconnect power first.
So my ac and heat are running at the same time and that's even after totally removing the thermostat and isolating all the wires..... Would this lil booger cause all that?