DIYbanter - View Single Post

wrote:
I recently purchased a Honeywell RTH7500 to replace a Trane Baystat240.
I have a multistage electric heatpump and A/C. I was about to call my
local HVAC contractor to install it, when I had the idea of at least
reading the manual first and seeing how complicated the install would
be. The manual left me feeling like I could do it. (after all I am
not completly ignorant - just mostly). The wiring diagram looked
straight forward, this is what I came up with:

Baystat240 - Honeywell
red (R) - R
black (T) - not used
Orange(O) - O
Green (G) - G
Yellow(Y) - Y
Brown (X2) - E
Blue (B) - C
White (W) - Aux

Seemed real simple - and the problem that resulted seems like it may be
real simple: When the heat is on the thermostat - I get ac, and when
the ac is on I get heat. Is it time to follow my first instinct of
calling someone - or is this a simple silly-ass problem?

Thanks for the help

And if it is a heat pump, that requires a thermostat specially made for
pump.