Is the relay REALLY bad? | Understanding HVAC Electrical Concepts

Thank you for being a great teacher

I have a question to ask. With the hvac in my apartment like when you use it to heat up the apartment and it gets to the temperature in setup to shutoff at a giving point it just running and running without a break what does that mean?

Pretty solid video. Thanks

Thank you so much for your video I'm new in this field and you have a very good teaching ability and very informative. helped me out a lot. Again thank you for your time in making this video.

Be carefull using continuty on a meter as the be-all-end-all for troubleshooting coils. A lot of meters will use TINY amounts of current in continuity mode, so if you try to test a high load coil (120v and higher) you will still see OL on the meter, doesn't mean the coil is bad, you just didn't have enough juice from your meter to register.

Great video. I like your channel.

Good lesson.

I had a condenser contactor that would close for 8 seconds, then open. Checked for continuity through pressure switches, all okay. Noticed discoloration around the base of the contactor. The contactor coil had just enough resistance to draw the contacts together for 8 seconds, then the resistance would drop, opening the contact points.

If the coil on the relay/contactor is getting 24vac and not picking up why continue to test?

GREAT content! Thanks for that last part using the jumper for motor controls! 😮👍

I have watched so many videos trying to troubleshoot my blower/ac problem and gotten nowhere. This has been incredibly helpful.

Thank you very kindly for your time and sharing the knowledge and different tactics to identify electrical issues.

On the power input connection block it is interesting that the machine side has multiple conductors all having stranded wires underneath a single connection screw, without the use of ferrules. The two black wires could use a two wire ferrule, and the three red wires could use a large ferrule to accommodate all three. It may be better for the three red wire connection to use a in-line butt splice with the three wires on one side and a large gauge THHN wire, perhaps 8 AWG or 6 AWG of only about a two inch length, on the other side. The screw block could certainly accommodate an 8 AWG THHN wire.

The Fluke 116 used in the video has a low Z mode on Auto-V which addresses AC ghost voltage. However, many times the Auto-V mode is not needed so AC Volts are used instead like in the video, but not without LoZ. This is one of the reason why I went to a Fluke 289 for HVAC work. The 289 has an AC Volts LoZ range without auto V, which is very helpful in eliminating ghost voltage, and one click away is the AC Volt range with a high input impedance, and next to this is the mV AC Volt range.

Hands-down, one of the best videos I’ve watched on troubleshooting. Your ability to dumb down information for somebody new into the trades is amazing. I’m a 2nd yr apprentice stationary engineer for local 39 in sf.

Nice video man

When you go to ohm out a coil on a contact what number do you want to see?

Bro can you help me with wiring unit

Very boring.

It's not that complicated. This ain't complicated. It's simple linear troubleshooting.

Thanks for sharing your knowledge

Thanks for this wonderful video. What can cause the relay to make clicking noise continously. The blower motor works fine. I changed the relay it's still keep clicking

Man your videos are exactly what I’ve been looking for man ! Little things that we over look thanks bro

U would make a great teacher if you arent already. Great video

Thank you so much for sharing knowledge. I have been trying to educate myself for understanding relays , sequences and troubleshooting for furnace and Ac by watching lots of videos post by many educators for so many years, and your teaching is helping me to understand and learn more for me. I have been watching lots of your videos nowadays and helping me to understand more. Please keep educating and share you knowledge in future too. Thank you

please do one on sequence of operation on RTU, thanks.

Thanks for sharing!

Awesome explanation. Keep those videos coming!! Thank you!!

Correct me if i am wrong. We have to put a jumper from 2 to 5 and the wire for the lower speed to 6? Cause this cannot be used for heat strip unless the amperage is comparable to the heat strip. Best to use a 90340. Correct?. I appreciate your respond. I seen this use to replace Goodman circuit boards or boards similar to the one used by Goodman.

The coil is the load and the top is the switch. You are correct. Once again thumbs up. Love your videos.

I use my meter every time, i belive any technician that assume that a part is bad without using the multimeter shouldn't be in this business. I am retired, only have my right arm, but i always use the multimeter.

Awesome video thanks John!

i really like your videos but i got confused on this one. when you said if power is passing through the switch you should get 208 when its closed with your lead on L2. but if your leads were across the actual switch voltmeter would read 0v correct? i think i just got confused because L2 looks like it should be L1 lol

love your videos didnt know 0 ohms across a relay coil meant its bad.

That wasn't a technician was apprentice, you pay what you hire. A poor technician or a great technician.

Hi, im a new subscriber. I like this video. I've installed this kind of machines, but never had to troubleshoot one. Do you have a video about heaters and how they work and all?

thank you, i always yell at relays and tell them to grow up and be a contactor

Really well done, what do you recommend for a technician( new) technician when they come up on a wiring diagram and they are having trouble tracing it out(getting overwhelmed with all the wires)

Top of the line simplified troubleshooting

Hai John , i wants ask you a question, i was wondering can I switch the air handle normal transformer to resettable transformer, in case the red power ground , burning the transformer so we just need reset it doesn’t need replaced, because the price are very close??? Thank you 🙏

Thankyou for time

Thanks, I have been lucky lately finding such a great video that really brings me closer to being confident in my diagnosis of HVAC equiptment.

thanks for sharing the video. Great work. question? where are the 208 voltage wire (4 wire) on the relay connect to? thanks

LOAD THE PARTS CANNON!!! READY, FIRE, AIM! Just kidding. And I think your paying to much for parts! First tool out of the bag should be the meter.

Mr John!
Your videos are very informative. Please continue to upload videos. Thanks again!

Just checking if you have any videos on teaching ac available great demonstrations

Are there any fan relays with a time delay for the heat strips? Would sure be handy to replace hi priced boards or when you cant get one. The fan needs to run for a bit to cool off the heat elements.

Wow! You read my mind. I was about to comment that you could hook up the motor to direct power to check if the motor was good. And then you threw in that exact thing at the end 😛

I have a question about fan speeds. If you want the heat mode to go faster, is it possible to connect the Black wire via a y jumper to both the Heat and Cool terminals on the fan board? Then you would have only one speed (high) for fan only, cool, or heat. Is this possible to do, or will it cause problems?

Thanks for the refresher JJ

I see ya boss lol 😎😎😁✍🏾. Good shit here though John

Thank you 🙏🏻 John for a other great 👍🏻 troubleshooting video can’t wait for the next one keep them coming , stay safe out there