Testing Transformer HVAC

Рет қаралды 124,277

Sam

6 жыл бұрын

Title of video is self explanatory. Enjoy!

Пікірлер: 32

@realestateinfonet9041 2 жыл бұрын

Very helpful information! Thanks for taking the time to share it with us! Sincere regards!

@PBS-nm1uu 4 жыл бұрын

love your videos please keep them coming.

@raymondliles812 3 жыл бұрын

Just want to say your video fixed my problem. Just replaced the control board and transformer but still didn’t work. I left the cover off incase I needed to do something else so the safety switch was still on. Put the cover on and now it’s working like normal. Definitely a duho moment.

@wisdomwisdom817 3 жыл бұрын

Awesome job thank you so much

@Surannhealz Жыл бұрын

😂😂 was looking for a video that showed how to measure the voltage with the transformer still in place, since many recommended videos have the setup on a plywood display. And sure enough, you hitting the switch made me remember I need to push the lock out switch closed to get voltage to the transformer. 😂😂

@acservicedaytona386portora3 6 жыл бұрын

Good filming as well.... Some guyz get me dizzy..🌴😎👍

@batistafrose6009 4 жыл бұрын

Nice video

@jjesusnunez2 6 жыл бұрын

Damn nice

@EEZYEEEE 3 жыл бұрын

This morning I woke up with the heater running but our Honeywell wifi thermostat screen was blank so I used my multimeter to try and get a reading at the wall but the voltage came back as 0. I went up to my attic to check the condenser drain pipes, which doesn't have a safe-t valve feature, but I didn't see any clogs that would trip the power to the thermostat. The pipe was clogged a little and I cleared it but it wasn't at a point where it was backing up to trigger any overflow issues. Then I popped open the furnace to check the fuse and it wasn't blown. The low voltage power-in from the transformer to the board gave a reading of 17 and the board was flashing green with the heater still running fine. I tried to take a voltage reading for the wiring going to my condenser unit but it only gave a 1.3 reading. Would greatly appreciate some insight and suggestions, thank you!

@ibbriley399 Жыл бұрын

Please explain why someone should test for 120 volts to the furnace when you do have 24 volts from the control transformer.

@Chefmeh Ай бұрын

How did you get the leads off the motherboard from the transformer? I tired but it was on there pretty well. 1:30

@Ziji-LetYourSoulShine 4 жыл бұрын

When I test my transformer, when it is not connected, the meter reads resistance on the high side and the low side. Like 18 ohms on the high side and 1.6 ohms on the low side. The circuit board has no power when I connect the transformer. I've got 120 v at the lines that go into the circuit board. And 120 v coming out of the board through the wires that go to the high side of the transformer when I push the door switch, but no voltage coming out the low side of the transformer. (And no red light) So is the transformer bad, even though there is resistance when the transformer is unplugged?

@rconger24 3 жыл бұрын

Great question...

@jimbarron8688 10 ай бұрын

Make a cheater cord and connect it to the transformer primary. Plug it in and check for 24 v on the secondary. Simple. Using an ohm meter properly will give you a reading of OL if the winding is bad and reading if it is good. The secondary winding is far more robust and is generally still good even when the primary winding is shorted out. You must not hold the test probes with your hingers when checking as this may result in a false reading.

@aaronclark1599 Жыл бұрын

How would I wire a 24-volt transformer on a package unit? Does the 24v to red on the board and the other to common on the Board?

@gpsperez5193 2 жыл бұрын

So if there no voltage to the main board it could be the transformer ?

@jimbola77 6 жыл бұрын

SUPER!!!!!!

@briang2566 5 жыл бұрын

I thought I had a bad control board...since I had no tripped breaker, no status light, good fuse on bird and no power at L1 and L2 (Carrier 80), installed new board and same issue. It seems I’m not getting power at all to the furnace...tested breaker with meter - 120 on each breaker, tested for 120 at the service disconnect switch and not getting anything - since the breaker is testing good...could the power switch for the furnace be bad?

@MoreThanMaintenance 5 жыл бұрын

No status light indicates to me loss of power to board. Check incoming power... are you getting 120 volts? If you are I would suspect the safety switch located on the panel door. Let me know how it goes!

@briang2566 5 жыл бұрын

Sam Thanks for the quick reply Sam, we’ll...the power issue turned out to be a mislabeled breaker that looked like it was on but was off. Got power to the board now...but when it turns on (cool, fan ON) the blower motor is making a whining sound as it ‘attempts’ to start...then shuts off. I swapped the capacitor with my other upstairs unit of the same model and it’s still doing the same thing. I can turn the wheel freely and don’t currently feel any play. I’m about to pull the blower motor from the working unit and install it in the non-working unit to see if that resolves the issue...does that make sense or would you suggest I go another direction?

@johnponzo1115 3 ай бұрын

i did some testing with my multimeter. i have no voltage at the thermostat terminals. in the furnance i have no voltage on the terminals that say R W Y G etc. either. my led light on the furnace is not lit at all. i have voltage from the switch to the board. (120v). the fuse doesnt seem to be burnt. what could the possible problem and solution be?

@gsalazar8080 2 ай бұрын

Same with my unit ?

@erair5416 7 ай бұрын

Im getting 120v at the board L1 but at the wires going into the actual transformer are only getting 100v is this a board issue? There’s no 24v

@arkanoiddude 5 жыл бұрын

Ok I'm a little confused...the low voltage wires coming from the transformer are hooked into the circuit board, I get that. But why are the 120v wires also hooked into the board? Aren't those the wires that are supposed to supply power to the transformer? If both the 120v wires AND the 24v wires are tied into the circuit board, how is the transformer being powered?

@5822huron 5 жыл бұрын

Its called a step down transformer... primary is 120v,secondary is 24v..

@amadeusgrandson7357 3 жыл бұрын

Think of the transformer as a bouncer, it’s limiting the 120v power to the board to only 24v

@rehxisdaddyy3879 5 жыл бұрын

Are Transformers universal for every or most furnaces?

@bluetorch13 Жыл бұрын

I'm getting 11.5v... damn....

@jaywallace9800 4 жыл бұрын

I have a question sir. My ac unit is not working. The thermostat is turned off and has no power coming to it. I checked the breaker box and its fine. I checked the 5 amp fuse on the air handler control board and it is fine. I am getting power everywhere except the control board and the output of the transformer. I have 240 going into the transformer but less than 1 volt on the output which is supposed to be 24 volts. I checked my contactor and it does have power. When I press the button on the contactor the AC unit will turn on. So I'm not sure if it could be a bad transformer or a bad control board or something else?? Your advice would be greatly appreciated! Thanks!

@msonufriychuk 3 жыл бұрын

Did you find the answer?

@jaywallace9800 3 жыл бұрын

@@msonufriychuk yes. The switch on the breaker in the air handler went bad.

@msonufriychuk 3 жыл бұрын

@@jaywallace9800 thanks. I'm currently working on my trane unit. I have no power going out of the transformer. Took that off there is a brunt spot.. hopefully that will fix it. I got 25° last night.