I am planning to replace my old RiteTemp thermostat with a wireless one, tentatively Venstar T1100REC. I have an oil furnace for baseboard heating only. There are only two wires W and R coming out of the wall connected to my old thermostat. I measured the voltage between W and R and there is 27VAC (not sure it is from the battery of old thermostat or from the transformer on the furnace). Can I just connect those two wires to the Venstar wireless thermostat? Will it work? Please anyone give me advice before I buy the Venstar thermostat. Thanks.

Here are your directions I suggest you just follow them or call the company for advice.

http://www.venstar.com/Support/Installation/T1100RECManualInstallRev3.pdf

Thank you for your prompt reply. I have read the manual but it does not address any installation for two wire system like ours. Is two wire system applied to four wire one? I can't find the phone number of the company either. Can you run a quick diagnosis for me before we run into the problem (don't want to spend $200+ for nothing). We are new home owners and have zero experience on any heating and electrical system. Thanks a lot.

Support Email:
[email protected]

Telephone:
(818) 341-8760


Since you do not have a C wire you might have a problem that is covered below.


SYMPTOM: When using 4 wires (R, G, W, Y),
The air conditioning or heating equipment
Tries repeatedly to turn on, but cannot.
CAUSE: There is not enough power available
To "power share".
REMEDY: Connect a 250 ohm, 10 watt power
Resistor at the furnace as shown below.
R G W Y C
TR300-10w
R G W Y C
TR300-10w
For Problem A/C
Note: 2 resistors may be used at the same time

WHY do you want a wireless thermostat to start with?

Never use one if a regular T-stat is available. Too much $$ and there more trouble prone.

Our old thermostat for bedroom zone heating locates on the wall of hallway instead of inside the bedroom. Therefore, the thermostat senses the temp in the living room (stupid someone installed the thermostat in this location). Re-wiring is a headache and we don't want to do that. That's why we need a wireless one that can sense and control the temp inside the bedrooms.

I see. Go for it. All the info you need is listed in my last post.

I am so grateful for your answers. You are the best! Hope to have you again if we ran to any real problem in the future.