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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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Posted on Jan 02, 2017

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What is wrong with my water softener Autotrol 740 Electrical problem?


if there is a bridge rectifier or diodes directly down line of the transformer i would suspect it is bad.. put an inline fuse also on the primary side of the transformer and wouldn't hurt to put a fuse on the secondary also if the transformer only has two wires for the secondary..

May 14, 2014 | Autotrol 263/740 Performa Logix Control...

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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 | Heating & Cooling

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I need transformer secondary burned out, can't find one need cost please.


Hi,
Not sure what transformer exactly you need nut I am assuming it is a 24v HVAC type....

Check these out

I hope that they are what you are looking for...

heatman101

Sep 15, 2010 | Garden

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 Heating & Cooling

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Connecting an Aprilaire 700M to my HVAC system. I do not have the wiring diagram for the fan control board for the HVAC system. Aprilaire diagram says to wire the 120VAC to 24 VDC transformer to the HVAC...


If you don't have a volt meter, purchase one. I've seen them as low as $20.00 at Sears and even lower at Home Depot and other discount stores. The HUM terminals are most likely low voltage (24v). The "N" is the neutral. Assuming you have confirmed this is low voltage (24v, you will use HUM and "N" terminals. This control sequence is typically to allow for operation of your humidifier only when there is a call for your fan to run. The brown wires coming from your Humidifier are your low voltage circuit. One should be directly wired to "N". The other should be ran to your humidistat. The other side of the switch of your humidistat should be wired to the HUM terminal.
I hope you will find this helpful. Good Luck!!!!

Feb 06, 2010 | Aprilaire 700 Humidifier

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We replaced our thermastat with a new one and it would notwork. replaced with the old one that had worked and now it does not work. is there a reset


Common problem with changing a tst. You blew the fuse in the furnace or Air Handler or you burnt up the transformer in the furnace or Air Handler. Hopefully you just blew a fuse. A 5 amp automotive fuse will fir back in the holder. Most all companies use a auto fuse 3 to 5 amp. Some have abreaker on the transformer. If you burnt out transformer you have yo replace it. Not hard to do Most of the time they 40 VA transformers. Go to HVAC supply house and buy one about 15.00

Dec 05, 2009 | Refrigerators

1 Answer

How do i hook up my humidifier using a seperate transformer


If you chose to install this with an auxilary transformer. Turn the main power off to the furnace. Mount the transformer on the handi box to the furnace or inside the furnace cabinet. Wire the primary wires from the transformer to the main power coming into the furnace. Connect black to black and white to white. Wire the secondary side of the transformer in "series" with a #50 relay, the humidistat, the solenoid valve and back to the transformer. Determine which wire powers the blower motor for the heating speed. Clamp the #50 relay to the wire.
Good luck
HVAC Teacher

Feb 22, 2009 | Honeywell HE260A1010 Whole House...

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 | Heating & Cooling

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