On this be used to replace an old-fashioned 2-wire thermostat -- (gas heater with fan)?
303886
If you're only controlling heater, then use a 2 wire heat only unit like this one:Heat Only Digital Non-Programmable Thermostat
303887
Hello Joe, this thermostat is for Heat and Cooling system. it control both heater and air conditioner and I have 4 wires to the unit. I'm not sure it would work with only 2 wire controller.
2055305
I replaced a analog that came from the factory with this thermostat and the wires matched color for color. I think that the only difference would be if you had a heat pump thermostat,then this one would not work.
1074808
Not sure whether or not they can. Can you provide more details as to what your trying to accomplish by having 2 thermostats.
543759
The thermostat that I replaced had "Coleman-Mach printed on the cover, but no model number. The system had heat, off, fan and cool. The fan had "on" with either high or low and "auto", also with low and high. The were six color coded wires on the old unit, as well as the replacement. Blue, brown, green, red, yellow and white. If your old thermostat has six wires as well, I don't see why this model wouldn't work just fine for you. I am very pleased with the way my replacement works.
2005449
Yes you will need a thermostat. I used the one that was on the old unit and its working just fine.
1847693
I don't know. It wouldn't work for me, I had to have a faulty board replaced in the control system as well as a new thermostat.
746238
Yes. Assuming you have a therm already installed this will replace it with little work.
1406055
If the existing thermostat just closes a low voltage circuit it should work. That's most two wire thermostats. The only other considerations are the minimum run time and the low & high set point. You can adjust the temp spread on this unit using jumpers inside it.
1387696
I think the temp controller is on the cord, so if yours is OK I would think you can use it. Ours shorted out so we decided to replace both the cord with the thermostat and the heating element.
1778027
I would assume you would.t need the kit, but you do need a electrical connection. My heater is a replacement for one already in place. Works great.
1889336
It worked for me. There are instructions about where to put the 2 wires. It's just a relay closure. But, when I asked Honeywell about it I got an answer from someone who apparently was clueless about electronics. But, I used it on a system with ~ 15 volts to the relay and it was fine. That was about 6 or 7 years ago. Now there are "millivolt" thermostats. Some systems have a very low voltage sent to the relay. I don't know if the (thermo)stat you're asking about will be used in in such a system. If so, better check. My system was very old. But, basically, yes, only two wires are needed.
2017766
I think this can replace your thermostat. You didn't say if the system was electric or gas (hot water) heating but the heavy current is probably being handled by a system relay. You can download the manual and installation document from Honeywell for additional information, and/or check with a heating contractor to be sure.
1153500
Yes thats what I did works 10x better then original fan. Easy to install using your existing wires.
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.
2221039
If it's exactly like this one, most likely yes. My original one was a coleman , the wiring was different and the diagram that came with the thermostat was the wrong one for that model. Didn't work for me. Good luck.
1123270
Yes. The thermostat is on a small circuit board -- easily reachable. A pair of wires comes from the solar panel -- cut that. Another pair goes to the fan. Cut that pair and connect to solar pair. Run free. Sam
1789634
Jeff is correct. Only two wires (conductors) are needed. If you have thermostat wire with more than two conductors, no problem, just use two of them and ignore the rest.