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Have mastertrol mark V three wires to old thermostat installed new honeywell TH3000 need to wire ?

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Posted on Jan 02, 2017

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bobicehouse
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SOURCE: I'm installing a Honeywell RTH6350D

One to R terminal the other to W terminal

Posted on Nov 04, 2010

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I just got a honeywell 5160 my old thermostat has an extra wire. Called support lady told us to twist together with another wire but sounded very unsure of herself. What do i do


Don't do that. It's possible the new thermostat doesn't require the C wire which is a common wire just tape it off and push it back in the wall if you have standard color coding R should be red W should be white Y should be yellow G should be green the other wire is not used. Or just match terminal for terminal with your old thermostat the leftover wire is the extra tape it off tuck it back in the wall

Jan 02, 2018 | Honeywell Heating & Cooling

1 Answer

Can I install this thermostat to a Geo Thermo Premier 2 Water Furnace with the following wires connected as follows from old Honeywell thermostat TA511M1010? Old connection; R, C, Y1, W, Y2, L, O, G


Yep, you should be able to run your water furnace with the thermostat. Just wire it up same letter to same letter on both devices. If your thermostat worked before, it should work again. I couldn't find the honeywell part you listed, but the terminal designations tell enough on their own. Don't forget to shut off all power sources before doing any wiring, and to configure the control board on the water furnace before switching the thermostat to any active mode.

In case you don't have it, here's the install guide3 for the water furnace.
http://www.waterfurnace.com/literature/premier/IM1555.PDF

Please mark me helpful and feel free to ask more questions in this same thread if you need to.

Jan 03, 2015 | Honeywell Heating & Cooling

1 Answer

Bought new thermostat model ct87k but old Honeywell model I have was hook up by black and white wire not red and white , so how do I hook up.


The two wire Honeywell T87 and CT87 is nothing but a switch in a control circuit. Wire color is not important at all. What is important is the TERMINAL DESIGNATION those wires are hooked to. Soooo....take the wire off of the sub base of the old stat terminal marked 'R' and attach it to the new sub base terminal marked 'R' and so on. Wire COLOR means nothing at all in your case.

Oct 04, 2014 | Honeywell CT87K1004 Round Heat Only...

1 Answer

Which termostat works fine to operate AC and Heat with Mastertrol mark v and i did check there is only 2 wires red and white.


You could use a dual thermostat and this is a three wire to control cooling and heating.

Aug 31, 2011 | Heating & Cooling

1 Answer

I am trying to replace my honeywell T834C2499 with a programmable RTH221. I have hooked the wires as follows: G to G, W to W, Y to Y and R to Rh - leaving the jumper between Rh & rc. My problem is that...


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

May 31, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Three wires not marked for new Thermostat!


You will need to go to the heating system and see what color wires are hooked to that. Typically the black and white wires will be used unless they used another color due to a bad wire. Hook the colored wires to the R or RH terminal on the thermostat and the other wire to the W terminal. You can also try taking the wires you have and one by one twisting them together and have a second person inform you when the heating system turns on. Take those two wires and hook them to the terminals I mentioned above.

Jan 14, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Need to wire a honeywell RTH7400D thermostat to 3 wire hot water


Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Oct 18, 2009 | Honeywell Electronic Programmable...

1 Answer

Upgrading Thermostat


Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

Jan 30, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Replace three wire thermostat with four wire thermostat


From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

Jan 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Replacing a thermostat


Typically if you are replacing a heat only thermostat you will have two or three wires. On the old thermostat these wires will be attached to terminals marked "R", "W" and maybe "G". Document what color wires goes to which terminal and transpose these to the new thermostat. If you have a heat and cool thermostat, you will have two or three more wires and connected to terminals labeled "C", "B" and "Y". Again, transpose these wires to the new thermostat as best you can.

Feb 12, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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