From: "TURTLE" 
Newsgroups: misc.consumers.house
Subject: Re: AC burns transformer
Date: Tue, 15 Mar 2005 16:28:20 -0600


"Scott"  wrote in message 
news:1110917295.173361.145260@l41g2000cwc.googlegroups.com...
> My AC keeps burning transformers in the past 6-9 months.  I had a
> RiteTemp 8022 thermostat before, and it worked fine for AC, but burnt
> transformer whenever switched to Heat.  The primary of the transformer
> was burned out everytime.  The transformer is 220V input for the 24V
> output.
>
> Later I found I had wrong thermostat and also bad wiring to the
> thermostat.  I install a new expensive transformer (about $40 vs $10
> for the regular one) with pop-up switch (sorry, I don't know the exact
> name.  It's kind of transformer with a reset switch giving certain
> protection) and replaced the thermostat by RiteTemp 8010 with wiring
> instruction from the RiteTemp support.  Both AC and Heat worked well
> for about 3 months.  Now, the transformer is bad again.  However, both
> the primary and secondary seem fine, but the reset switch of the
> transformer went bad.
>
> The possible reasons I can think are:
> 1) The tenent turn on/off the thermostat too often (This is for the
> rent house).
> 2) The tenent set the temperature too low for Cool and too high for
> Heat, so that the AC/Heat hard gets rest.
> 3) The AC/Heat unit is two old.  It is about 10 years old.
>
> Do you have any idea what is the problem?
> How can I find the problem and correct it?
>
> Following is the wiring for the RiteTemp 8010 as you
> taught me:
>
> (Left are terminals from AC unit, right are terminals on RiteTemp 8010)
>    R to RH with Jumper to RC
>    O to O
>    G to G
>    Y to Y with jumper to the W terminal
>    W to W2
>    B to C
>    Others are not used.
>
> Thanks for help.
>
> Scott
>

This is Turtle.

I feel the problem is in the B to C as to the problem. I can't see it from here 
or you have not told if it was a heat pump or other type system. All I know now 
it it has a Rite Temp 8022 and some type heating and cooling system it is hooked 
too.

TURTLE