I have the old round Honeywell mercury switch and is heat only (two wire leads red and white). Will this thermostat work? I have a Newer furnace.
335162
The thermostat will certainly work, but you will not be able to manually turn on the fan function on the furnace. That is, all of the automatic functions of the furnace including the fan will work fine exactly as they have with the old round thermostat. If your furnace is not Hot Air you'll need someone else and his/her comment for advice.
1968722
its a switching device. i believe it will work for any two wire heat only set up provided that it falls within your amperage specifications. i replaced my atwwood thermostat with this device and it works well. It comes with a back plate to cover any size opening.
1540894
Not sure about your heating system, but mine has two wires only. I connected them to R and W with no issues.
161537
It depends on your existing thermostat. This unit requires 5 wires, with the 5th blue wire requiring 24V. If you have a modern 5 wire thermostat, it should work by hooking it up as you say. If you are currently hooked up to only 4 wires, I suggest getting an HVAC person to help out.
990534
I called my provider (Customer Service). They said it would work. If they won't tell you ask for the supervisor. My Honeywell has worked fine for almost two years.
402985
Assuming that you are replacing an existing thermostat, replace the wires in the exact same sequence as the old. I always make wires before I remove them. If it is a new installation refer to the furnace wiring instructions. If you are a novice electrician, call a professional installer. It costs money ,but you will get heat and cooling that works.
1916110
I don't know a specific answer to your question, however when I was installing mine, I had a wire that I didn't know what to do with. I contacted RCS (check their web site) and received prompt and courteous support. My thermostat works great!
1611154
I believe so, check with your installer because this unit comes with two components,1: is the thermostat itself, 2: is a unit that connects at the furnace or AC unit.
101074
Depends on how many wires , your voltage and wattage. This thermostat uses a two wire setup. It seems like you might have 4 in which case it wouldn't work. Maybe check out the Honeywell site for more specific information and the manual on it.
1284674
Yes it will work. Most units are standard until u get to the brand new models. Most common mistake people make is thinking its the heating element when its actually a high temp limit switch. For the money try the heating element first. If that doesnt fix it i would look there. Good luck.
1540896
I do not think so. This unit has a direct plug that controls both heating and AC. I would suggest you check directly with Honeywell on this one. You are looking for a single function thermostats just to control heat.
1021374
There are instructions in the packaging, but I do not know if you can find it online. That said, since this is a millivolt heater only controller, there are only 2 wires to connect and its pretty fool proof if you are replacing an old mercury heater switch.
1813079
Not sure since I use a forced air furnace (no a/c). Check your existing thermostat - I only hooked up 3 wires and it works great!
2221043
as long as the temp slide and switches are in the same places and have the exact same functions then yes they are both analog thermostats and should mate with the board up in the unit. be sure to turn off the breaker going to the unit in question before you touch th old thermostso you don't short and blow the upper control board while changing out the thermostat and wires accidentally touch. good luck. TTFN GLENN
488680
Yes, this thermostat will work, as long as it controlled by a 2 wire system. I had mine installed before last winter (around Sept '14), it has worked fine all these months.
1842378
Yes. It should work just fine. This kit comes with the wire harness wired to two heaters and a thermostat. It took 5 min to install..
1880403
I ordered mine based on the model number of my old motor. So it matched up just fine. I have a thermostat box with the original fan. The thermostat box acts as a junction box also. The two strand wire is connected to the power line with wire nuts in the thermostat box. White to white black to black.