Hello. I have a carier package unit
on the roof. The transformer is fried. primary side requires
230V . black and orange . I have no problem understanding this but,the transformers secondary side
puzzles me somewhat. this one has 2 posts with 3 terminal connections, on the side of the transformer. The wires that add up to 6 wires.I'll explain: two terminals posts for 3 wires each. A set of 3 black.One goes to the Compressor contacter. Probably coils. One down to a large spark valve
.The second post with 3 wire terminals are orange and white. they are clearly 24 v. one wire of this termiinal connects to Thermostat 24 v. wire. this is a 304960-702 Transformer. Sorry for being long winded. The sub for this Transformer is a TRA01BD208A. With a price tag of around 60.00. I have two questions. can i use a PF32440 Transformer Use the Primary side option of 230V Orange Blk. And on the secondary side connect
the 3 Black wires to the Secondary blue transformer wire. And the other set of wires orange ect
. to the yellow secondary transformer
wire. and be done with it???Any help would be appreciated. Thank YOu.
View related: wiring furnace transformer2012-10-26 21:51:45Hi all, I am trying to install a new transformer on my furnace and well the new transformer does not have the labels my old one did, COM , COM , 120v, 24v. Here is a picture of the transformer it only shows LOAD, LINE but doesn't specify which lead is exactly what.
Also I have attached a second picture of my old transformer.
Thanks for any help....
(Wiring Problem) Switching from MARS2 Control Transformer (CT) to PROTECH CT2013-06-22 15:53:46First, I would like to thank you for reading my post. Second, my MARS2 control transformer finally gave out, which, of course, stopped my entire HVAC system from working. However, when I went to the hardware store to purchase another control transformer the only kind they had was a PROTECH model.
The PROTECH model has a different wiring scheme from my previous transformer and therein lies the problem which lead me to you.
Originally, my Mars transformer was connected to color for color (Blk to Blk), (Blue to Blue), (White to White) and (Yellow to Yellow). Also, the red and orange wires weren't connected to anything but where taped off at the end.
However, my new transformer has almost the same coloring scheme BUT it has two yellow wires and I have no idea what to do with them.
How to install Aprilaire transformer?2011-12-11 02:28:30I just bought an Aprilaire 58 digital humidistat (I believe this humidistat comes standard on Aprilaire humidifier models 600 and up) to install on my existing model 550 humidifier. I think I understand the instructions pretty well, except a couple things.
The instructions say it needs a constant power source. The humidistat runs on 24v, so it has a transformer. The instructions say:'Wire the external 24 VAC transformer into a constant power source other than the heating, ventilating, air conditioning equipment (HVAC) blower circuit. The transformer can be powered off the 120 VAC line at the junction box before it enters the HVAC.'I'm no electrician, but I'm guessing that means I can just wire the transformer into the electrical box that has a switch to allow power to the furnace.
It doesn't say much more about the transformer than that. The transformer has two leads that go to the 120v power source, an odd angled screw (looks too thick to be for a ground wire and it's not colored green) and then on the other side, the terminals to run the 24 volts to the humidistat.
I'm planning to put this transformer in a metal box, near the switch to the furnace. However, what is the angled screw for on the transformer? Is this used to somehow mount the transformer in a metal electrical box? But if it was for that purpose, I don't know why they'd angle the screw. Or am I mistaken ... that this is the ground screw?
If anyone can advise if my wiring plan sounds good and what this mysterious angled screw is for, I'd appreciate it. Thanks for the help!!...
Lennox P-8-9490 Transformer Burned Out2011-11-02 16:40:48Two days ago I discovered my AC no longer working. The house thermostat indicated it was not receiving any voltage. I traced this back to the blower transformer which was not sending out any voltage. Input to the transformer was proper (110V).
Yesterday, in a pinch because of the holiday, I installed a Honeywell 25V 40VA transformer which I expected to work until I could get a replacement P-8-9490 transformer. The Honeywell also burned out. Is there any reason for the Honeywell to also burn out?...
Troubles with HVAC2011-11-13 17:37:25Everything was fine then we went and changed out the thermostat
Put in a Hunter
Programed it and AC worked. Switched to heat and it blew the transformer.
Friend changed it and put in a breaker so it could not happen again.
Switched to AC yesterday and it blew the transformer again.
So now it's cooled down to the 60s and No heat or AC
What could cause this problem.
Need to find a transformer and fix it so this does not happen again.
Thanks for any help...
transformer and circuit brd in gas furnace2011-11-21 22:17:08Payne 376C downflow model furnace... Units heats in response to thermostat commands but blower won't come on. If I bypass the circuit board with jumpers the blower works fine. HVAC guy came out and said board and transformer were fried due to power surge. Repair costs $500.
I wasn't home when he was here so I didn't get to ask: 'If the transformer is fried why would the thermostat still make the heat come on?' Am I on the right track? I can get a replacement board for $75....
Trane X1000 120/24VAC Transformer2011-11-15 17:47:22Guy's I have a problem that I need your help with. The 120/24 VAC transformer primary side was shorted, so I first thought maybe something was wrong internally, but I found no shorts. I replaced the transformer today but check for any shorts before doing so, turn the heat on and everything was good, or so I thought. I went to the store and came back to find the new transformer shorted on the primary side too. I removed the transformer and checked with my multimeter and found nothing shorted. What could cause 2x transformers to go out? It was working fine, no problems. Any help is appreciated....
Transformer keeps blowing2012-08-02 06:41:05Hey guys,
Sorry in advance for the long post, but I don't want to miss anything that may be important.
First off, I am no expert when it comes to hvac, or home electrical systems, but I'm not afraid to get my hands dirty
I have a Payne (made by carrier) 3.5 ton system that is only 1.5 years old.
Last week, one of the 120v leads coming into my house from the electric co went bad, and they had to replace it. When I noticed it was bad, the hvac system was only receiving 120v and was trying to come on. I could hear the outside unit 'clicking' continuously.
The next day after the electric co had 'patched' their lead until they were able to burry new ones, I noticed the compressor wasn't coming on. I replaced the capacitor (matched all specs (45/5uf 370v)) and the outside unit started up like it was supposed to. It ran for about 1 minute, and then the whole system shut down.
I traced the issue back to the transformer fuse (3a) and replaced that, the system started up again and died after another minute. This time the transformer blew but the fuse didn't. I tested the transformer and had no continuity on the load side.
Today I replaced the transformer with a multi-tap one, using orange and white on the primary side for 230v (what the original one used). When I turned the power on to the handler, it started to come on, and then the transformer blew again (I actually saw it flash). Does the polarity on the load side matter? There is a yellow and blue on the new transformer, and my handler has red and brown, with a ground tapped into the brown.
I'm going to pick up another transformer tomorrow. Should I attempt to wire it only on the primary side and see if it blows? I'm trying to avoid having to call a hvac repair man (I have a 5 month old and really can't afford to at the moment) so I would love to be able to fix this myself.
Any help you guys can give me would be greatly appreciated!
Thanks in Advance,
PS. I did check all the wiring I could see outsi......
transformer failure in a Trane XE782011-11-28 02:37:39I have a Trane XE78 furnace that has blown the power supply transformer. The primary windings were shorted in the original transformer. I replaced the transformer with the same exact on and it went out right after attempting to turn the A.C. on. With the A.C. off the light came on the board like it should.
I checked the blower fan with a separate power source and all speeds are working fine. I opened the control board cover and there are no visible bad parts. Can anyone point me in the right right direction? Thanks for your help...
How to Know if Transformer of Controller Board is Blown2012-08-20 01:26:34I've got a Carrier HVAC electric furnace that I seem to have shorted a component in.
I was installing a new thermostat and must have shorted the 24v wires during the install. The new thermostat was working and then when I dis-assembled it to mount it permanently that's when the problem occurred. I've traced the lack of power all the way back to the controller board.
The controller board is a model HK61EA and the transformer is model number AT175A1008. I can replace both but the control board is $250 so I'd rather swap the $30 transformer first. My only question is how do I know which one is faulty?
Incidentally I checked the 5v fuse on the control board and it's NOT blown (replaced it with a few backups too). The LED light on the the control board is also dead. Checked the main power to the unit and it seems to be hot. My guess is that the control board is fried somewhere or the transformer is not powering it.
Carrier 40aq024300BU (V)?..transformer2013-01-19 06:39:34I need to replace a blown transformer on a carrier 40aq024300BU....anyone know what the part number is, where I can find one? Thanks. Also...anyway to get the system running for heat! Here are the numbers I got off the old transformer 308346, could be 303346 hard to read. 60VA 24 volts Model number 40AQ024300BV Serial number:53A58192...
mgb100hd2011-11-10 06:32:04can someone tell me how to test a transformer on a utica boilers mgb100hd
pilot light is good but wont fire up
i clean the flame sensor and still don't fire up
now im looking at Faulty pilot gas valve or transformer i try to test the transformer and it just read 1 on the meter i dont know if i did this right or not need some help...
strong smell of oil from oil burner room2011-11-29 23:18:05Hi, i had my oil burner cleaned about 3 months ago by a guy that works for a hvac co., he goes out on the road to fix them.( but does mine on the side) About 1 month ago it stopped running so i called him up. He came out and determined it was the transformer. Seems like ever since the transformer incident i smell oil now, my unfinished bathroom with just plywood floor is right above that room and it stinks of oil. I really didn't think much of it til my wife said something last night. After that it seemed the entire basement really did smell so i opened some windows right away.
What could be the cause?
WAIT! Also i do remember last month when the transformer was bad i kept on pushing the reset button. I think i remember reading pushing the reset can cause this odor. Could that be the problem a whole month later?...
Condensor won't turn on. Need opinions2011-11-30 06:56:54I have following problem: When AC is on - contactor makes noise and wouldn't latch. I tried direct voltage from drill battery and it would latch evey time with 18V.
Anyway, I thought it's contactor and got it replaced. Didn't help.
I started to check beginning from transformer. Took direct wire from transformer to the contactor - CLICK
Shorted wires at thermostat - CLICK
Bingo! Thermostat is bad. Replaced.
Yesterday I got a call from tenants with the same problem
Now I'm thinking it can be either wiring or transformer.
Reason I think transfromer is because in a winter plumber did a short on control wire and transformer fried. I used transformer from humidifier but I guess it may not be rated enough?
What else should/can I check? It's a straight AC, everything is pretyy simple and I can't see what else might be wrong.....
Trane XE 80 burn my 120 to 24V transformer2011-11-05 14:14:22Yesterday I came home and found that my indoor unit burn the transformer. I installed a replacement but the A/C wouldn't work. After a few minutes I noticed a burn smell coming from the unit, I immediately unplug the unit. Today I went ahead and tested the transformer with everything off. It was giving around 26 volts. I went ahead and fused the secondary side with a 1.5 amp fuse. When turning on the fan alone it works fine. When positioning the thermostat in heat or cool, I blew up the fuse right away. I took off the fuse and repeated the process using the door switch so I could get the power off in a hurry, I get a small buzz sound from the transformer and the voltage reading drops to around 8 to 9 volts. At the same time the transformer starts getting hot. I check the outside unit (heat pump) contactor winding and is not open. Any suggestion will be appreciated. I also bougth a new transformer but not using it since the first one tested good without major load on it....
Testing transformer2011-11-17 23:47:22Friends blower stopped working. Checked his thermostat and hot red wire was dead. Checked his unit in attic. Blower motor humming bad not spinning and hot. Capacitor checked ok. But this kind of threw me. Looks like a combo transformer and fan relay tied together. Red 24v wire on front is dead. So I'm to assume transformer is dead but was confused because fan was trying to run, reading a dead transformer and thermostat was in off position. Am I reading this transformer wrong and just dealing with a bad fan motor or is it a combo of things happening here. Any feedback is greatly appreciated....
EMERGENCY Transformer2011-11-14 03:17:48The transformer on my furnace went out. It is a White Rodgers T40-24M1
Output 24V 40VA
Can I replace this with a transformer that is rated:
Output 17V 40VA
I would do this until the correct replacement comes in or can I use it in it's place.
The furnace (boiler) is a Hydrotherm A100...
A/C Transformer buzz - high pitched sound2012-08-30 19:56:19Recently noticed that a high pitched sound was coming from the Heat Exchange Unit (ComfortMaker 10 years old). Isolated the sound to the Transformer that is connected to the door switch.
Transformer Part Number: HQ1008782PU
115V; 24V, 40VA; 50/60HZ
Where can i purchase a replacement? Any Suggestions?
Does anyone know if this is common over time to have a high pitched noise?...
No ark on Becket Transformer2011-11-24 09:38:04My oil furnace will not ignite. I changed nozzle and I have good oil supply.
The motor and pumps work fine and activate when I turn the burner on.
I tested the transformer to see if there is an a good arc between terminal contacts but it fails the test. I can only get a tiny arc if the arcing distance is 1/64 of an inch or less.
My guess is that the transformer is bad. Is there anything else that I may have overlooked? The system does have an electronic eye.
Short circuit current for an HVAC 24 v transformer?2011-11-28 02:26:53'On paper' it's about 25 A.
Anybody measured this?...