This site dedicated to the memory of Mr Fred Hybart

It was his idea to post appliance repair advice on the internet for all to freely use and share. Mr Fred and his brother Captain Jim spent the majority of their lives helping the good folks of Mobile, Alabama. They both will be sorely missed but not forgotten by any means.

Special Shout Out to B&B Appliance parts

 
When in the Mobile, Alabama area, stop by on Holcombe ave and say hey to the friendly appliance parts professionals at B&B appliance parts.
Call them @ area code 251- 478-8485 or 800-633-1298
    Pete and RePete
"Oh foot: more kittys
     are on da way"

FOR ONLINE APPLIANCE PARTS:
Go to AppliancePartsPros.com for your best
price and quickest shipping

Navigation

Transformers and Thermostats

Typical wiring diagram of a central unit. As you can see the transformer is the boss. If it dies then you will have no heat and no cool. So if nothing is happening you should always check it first. If either the 120 v side or the 24v side is open you have a bad transformer. Some transformers are stand alone models while others are incorporated in with the fan relay. Why a relay? Heat side must have a slow speed fan and cool side must have a high speed. So the next thing is to check the relay. That is discused on another sublime page.
Typical 24 volt transformer
Fan relay with transformer built-in
All of these items should be checked for continuity.
If you have a failure of the unit to come on or a fan failure.
The above diagram shows how a system works using
24 volts. The 24 volts allows for smaller wires to run through walls to various inside and outside units so everythang can be all jiggity.

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Subpages (1): Superheat and Subcooling