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How to troubleshoot a hvac system transformer

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If it has high voltage in one side andlower voltage out the other.....its ok

Posted on Aug 06, 2008

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Why won't thermostat turn on after I changed the batteries?




I think you may have the model # incorrect, However if you have a thermostat as in the type that are hand held, polarity of the batteries is the 1st thing I would check, then test them for proper voltage, corrosion will often interrupt that small of a voltage, clean the terminals and test it .




A wall mounted like a central HVAC system typically will not require batteries to operate, this is for memory and they will work fine even if no batteries are installed, however there are battery powered stats too, meaning non parasitic type that not powered by the transformer in the air handler.
I will include a basic drawing of a residential HVAC thermostat to show you how the 24 volts powers most thermostats.






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Have two Broan exhaust fans that I want to wire to a programable hvac themostat.I'm told that I need a relay and not sure how they are wired. The fans draw 1.23 amps each and looks like they have


are you sure that your not looking at motor capacitor attached to each motor??? To use programable stat you would have to find line voltage stat with rating to handle fan amp . other option is to use low voltage stat and transformer and fan switching relay with fan motor wired through n/o contacts and relay 24v coil energized by low voltage stat.

Nov 25, 2012 | Air Conditioners

1 Answer

We live in southwest Florida. Our HVAC system consists of a air conditioning system with heating coils when it is cool. Yesterday morning we tried the heat nothing come on. Later in the day I tried the air...


Hello. Sounds like you do have power. That spring loaded plastic switch is a 24v contactor. It pulls in when energized. If you push it in manually everything shoud run normal. Ck your 24v transformer. On one side (feed) you should have 115v or 220v depending on what kind of transformer is used likely (115v). Coming out of the transformer you should have 24v. If not you need a new transformer. You will need a mutimeter for this. If you know you have power where the wires are connected then you know how to use a mutimeter. Only way to know for sure outside of manually pushing in the contactor. Good luck. Be sure to kill the power before making repairs.

Jan 15, 2011 | Air Conditioners

1 Answer

I have a carrier 38ckc026 and a two zone thermostat system. both thermostat displays are blank & a/c doesnt work - what should i look for before calling an hvac repairman?


Hi,
The 24v transformer blew or if you are lucky there is a fuse in the line before the transformer...

Check in the air handler to make sure the cover is on right... then check for power to the air handler, then check ofr a fuse on the circuit board, finally check the transformer...

The problem lies in one of those things...

heatman101

Sep 05, 2010 | Carrier Air Conditioners

1 Answer

Need to locate and turn on the reset switches on my intertherm unit my house is not cooling at all.


There are NO reset switches. You need a HVAC technician to evaluate and repair. Probably a bad transformer if nothing works.

Sep 03, 2009 | Intertherm Air Conditioners

1 Answer

I want to find the transformer for the 36 volt inside unit. Is it in the inside unit or outside unit .I have no power to the inside unit however the outside unit has power,and the inside unit appears to be...


It's a 24v transformer. Your indoor unit houses the transformer for the outdoor unit. The outdoor has a low voltage (24v) supply running to it to push in the contactor for the outdoor unit to run. If your air handler inside has no power then it will kill your LOW VOLTAGE power to the outdoor unit. You will still have the high voltage power to the outdoor unit. You may have a fuse on the switch for your air handler blown if there is one. On the disconnect switch mounted to your air handler, you will have a door to open and a fuse in there. If not, check your main breaker at the panel. If you don't know what a transformer looks like, you may want to have someone familiar with electrical of HVAC help you. To check the transformer for power, you first need power to your air handler, which you don't have. I would say that is not your problem. I would assume your air conditioner is not running outside, correct? Your problem is the power (HIGH VOLTAGE) to your air handler. Loose wires, blown fuse, tripped breaker etc...

Aug 06, 2009 | Comfort-Aire HMC36AT-1 Air Conditioner

2 Answers

Blown Transformer heat pump


blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Jul 26, 2009 | Ruud UBHC Air Conditioner

1 Answer

Carrier A/C making buzzer noise every 6 minutes.


Probably the contactor, they have a coil that sometimes buzzes, after the contacts become pitted and no loger pull together like they are supposed to. It could also be a voltage problem from the transformer that is causing it, but I would bet on the contactor. Get it fixed quickly as a voltage drop across the contactor can be the demise of you compressor!

Jul 13, 2009 | Air Conditioners

1 Answer

Goodman central unit not functioning


You may be putting the incorrect transformer in. Try to get a OEM from your local HVAC dealer. Which capacitor are you referring to?

Mar 29, 2008 | Air Conditioners

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