"Stormin Mormon" wrote in message
...
"Jason" wrote in message
...
Hi guys,

I'm in need of some help.

I just bought a Robertshaw 9851i programmable thermostats (any comments?)
and I'm not quite sure how to connect everything. My current thermostat
uses the following wires:

Rh - Heat Transformer
Rc - Cool transformer
Y - Cooling Control
W - Heating Control
G - Fan control relay
O - Cool active reversing valve
B - Heat active reversing valve

The new one I just bought has these:

C - 24 VAC Common
R - 24 VAC transformer
G - Fan relay
Y1 - Cooling Relay
B - Heat active reversing valve
W1 - Heating Relay
O - Cool active reversing valve
H - Humidity relay
D - Dehumidity relay

The only thing I'm confused about is the "C" and the "R". Where do I
connect my former Heat Transformer ("Rh") to? The C or the R? Would the
Rc
go to the C? I'm just not sure because their names don't correspond and I
don't want to risk anything.

A black wire is connected to RC on the thermostat and the a red wire is
connected to RH on the thermostat.

I went and checked the furnace and both the RED and BLACK wires are
connected to "R". Does that I connect the black and red wires to "R" on
the
new thermostat?

Am I way off?? Any help would be much appreciated. I've done lots of
research on the internet, but I'm getting a little confused.

Thanks in advance,

Abandon the black wire. Fold it back, and wrap it around the wire bundle.

Connect the red wire from R to RH on the thermostat. Leave the small
jumper
wire from RH to RC.



Chris,

You idiot......if you can't give accurate advice then SHUT THE **** UP !!!

There is no 'jumper' and there's also no 'RH' terminal on his new
thermostat........

Also, he really should run "C" from the AHU out to the new thermostat--while
many stats don't actually NEED that connection, there are some that
absolutely do....otherwise, at the very least he will get poor battery life,
and any led indicator lights on the new thermostat will fail to work...

--

SVL