My house has forced air heating. The original thermostat is manual. I only have two wires that connect to the thermostat. will this one work?
1540894
Not sure about your heating system, but mine has two wires only. I connected them to R and W with no issues.
1540895
It has several hook up instructions that come with it. It should work as a thermostat, but may not have "full" functionality: i.e. the ability to automatically switch between heat and air. Just be certain to read ALL instructions as there are a couple of switches that you may need to turn to the on or off position depending on what you are trying to do.
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.
1540897
YES, this is just like mine. Connect the 24V twisted pair from the heat-only system to the jumpered "R-Rc" and "W" terminals.
1540898
This thermostat should work for heat only, cool only, or both. You can find the installation manual at this link: https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1920EFS.pdf
1316519
1. I am not a Heating-AC technician so take what I say below with caution!2. I don't know for sure if a AC only model thermostat exists but, I think that I saw one somewhere while I was shopping for this one.3. I suppose if you left the Heat side wiring disconnected that this model thermostat may work for AC only but, I can't say for sure.
1074808
Not sure whether or not they can. Can you provide more details as to what your trying to accomplish by having 2 thermostats.
1572519
I do not believe the TL8230A1003 will work. The thermostat is for 208 or 240 volts which needs four wires to work. Since you have only 2 wires you have 120 volts or you are in Europe with a 2 wire 220 volt system. With only 2 wires the thermostat will not work.
2262506
I don't know, all i do know is I have a gas heater and air conditioner combo unit. the old thermostat was a four wire round mercury switch. this one does work great. i am not a expert but i would guess a thermostat is a thermostat, it checked the temp and then applies power to the unit as needed. I hope this helps. my power bill has gone down also.
1264511
Yes, it is a two wire or more. I used it with two wires and it works fine. However I needed to purchase a coverplate to cover the whole. I bought the Honeywell 50002883-001 which allows for a couple of cover options. I have a vertical box behind the wall and the thermostat needed a horisontal box.
280738
i think it should work, but remember it does not use household electricty, the heating unit creats electricty. and that is what opens and close the thermostat
1279358
Depends on your system. The manual states that this thermostat is for two wire systems (not counting a C or C1 wire). This does not work for 3 wire systems and list an 800 number for Honeywell Customer Service to call and check. I would list the number but Amazon would likely delete it.
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.
920389
No. You just have to make sure the connectors to your existing thermostat are compatible with this one. You can look at the one you have now and see if it is not by the online compatibility. I did not. And mine was not compatible.
2200709
It doesn't use a regular thermostat wire use the actual wire that powers it I'm guessing u could change the thermostat
1264513
This unit will accommodate 4 wires, Red(power) White (heat) Yellow(cool) Green (Fan). It will function with Just red & white(for heat) or red & yellow(for cooling)If by 2 wire you mean line voltage(120v or 240v) the emphatic answer is NO!!! It is a low voltage thermostat. (24v AC) Hope this answers your inquiry. Darrel
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.
388823
The answer is a qualified yes. All of the wireless accessories require an additional power wire to be connected to the thermostat. They call it the common wire I think it is 24VDC. Traditional thermostats will not have this wire. When I did the install, there was cable running between my furnace and my thermostat that had 2 unused wires. I was able to connect the blue one to the one of the connectors on my furnace and then the wireless accessories worked.
2005449
Yes you will need a thermostat. I used the one that was on the old unit and its working just fine.
1066006
The Wi-Fi thermostat must be powered by 24vac at all times, so it needs a power supply (typically red) and return wire (C or common). Most thermostats don't require a return wire. Take your thermostat off the wall and look and see how many wires you have. If you have both a furnace and air conditioner on one thermostat, you will probably have four wires attached: red (24v power), white (furnace relay or gas valve), green (blower relay), and yellow (compressor relay), though colors may vary. If you're lucky there will be a spare wire you can use for the C (common) wire. If not, you can run an additional wire from your furnace/boiler to the thermostat. Check out this web site: http://www.epatest.com/store/resources/images/misc/how-a-thermostat-operates.pdf It has schematics for just about every possible thermostat arrangement.
1958997
I had the same 2 wires on my old thermostat, and I found the answer in one of the responses to a review that was already on the site, by A. Pico: "I was in the same situation: two unmarked wires that when connected turn the furnace on. Simple. However, in my case, the trick was to connect them to positions R and W." Mine worked when I connected them to R and W also; does not matter which goes to which, and I did not take off any jumpers.