Linked Questions

0 votes
1 answer
2k views

How to connect a DIY thermostat to the HVAC System

I am building a DIY thermostat similar to this blog. I want to connect it to the HVAC system of my home. How do I do that? I found this post which is very informative but doesn't completely answer my ...
nad's user avatar
  • 101
0 votes
1 answer
2k views

Is it possible to use add-a-wire with my current configuration to add a C-Wire? [duplicate]

I only have four wires: Red, Blue, Yellow, and Green. My old thermostat jumps the R to RC and leaves C empty. I have a new thermostat that wants 5 wires, but I don't have C. I am not sure what the ...
Machinus's user avatar
0 votes
1 answer
747 views

Please help establishing a C wire for new tstat

I bought a new WiFi tstat as a replacement. The tstat controls my second floor hot water baseboard heat and my central air conditioning. I've located all the wires....the ones coming up from the ...
Evan's user avatar
  • 131
0 votes
1 answer
18k views

Wireless Thermostat C-Wire Substitute

I've read How can I add a "C" wire to my thermostat? and checked out the Venstar Add-A-Wire Accessory. I've watched Honeywell's YouTube video on "DIY Wi-Fi Thermostat Substitute G-Wire for C-Wire," ...
Kermit's user avatar
  • 1,228
0 votes
1 answer
23k views

How to connect thermostat C wire to Weil-McLain CGa boiler? [duplicate]

I have Weil-McLain gas boiler for hot water heat and going to install WiFi thermostat that requires common 24V 'C' wire. I do have a free wire in the cable but cannot figure out where should I connect ...
Dmitriy's user avatar
0 votes
1 answer
499 views

Thermostat C-wire replacement using a wall socket?

I have a Filtrete 3M WiFi thermostat. As expected, it takes a C wire, which my apartment doesn't have and the apartment maintenance folks wont' let met wire either. However, there's a wall socket ...
Hari Sundararajan's user avatar
0 votes
1 answer
844 views

How can I get my thermostat C wire connected? [duplicate]

I have an older furnace, on the switch block I have Y,C.W,R and an unlabeled screw that connects to the shut off it looks like. I need to hook up a thermostat that needs the C wire. I have a spare ...
Brian Miller's user avatar
0 votes
1 answer
2k views

Options for adding “C” wire to thermostat [duplicate]

Possible Duplicate: Options for adding “C” wire to thermostat I am upgrading to a newer thermostat that requires a constant 24 volt feed, I have an extra (unsused) wire in the cable ...
John Waters's user avatar
-1 votes
1 answer
81 views

Adding a c wire for a thermostat

Trying to add a C wire for a new Nest thermostat. Currently only have a Red and White wire. There are no other terminals available for the C wire on the furnace transformer. Red go to one end of the ...
Joseph's user avatar
  • 1
1 vote
0 answers
108 views

How do I go about wiring 3 Nests to a boiler with no C wire

I’ve seen a version of this question in a few places but nothing really fits. I have a boiler and hot water baseboards. It’s a three zone system and I installed 3 Nests but there is not C wire and no ...
Unhuman's user avatar
  • 11
1 vote
0 answers
2k views

Problem connection C wire into Lennox Furnace

I would like to connect my new Honeywell WiFi thermostat (RTH6580WF1001) to a Lennox Elite dual Heater and Cooler system. I don’t have a C wire in my old thermostat. I have read online that I can ...
Antonio Monserrat's user avatar
1 vote
0 answers
25 views

How to add extra 24VAC wire (C wire) [duplicate]

I have recently bought a Honeywell rth9580 programmable WiFi thermostat. Unfortunately I have old electric heating/cooling system probably from 70's. The system is based on two relays (I guess ...
Konrad Nowak's user avatar
1 vote
0 answers
5k views

How can I add a common wire to the existing furnace wiring?

My current furnace has Rh and W1 to the thermostat. I'd like to add a C for my new networked thermostat, but I'm not sure where to connect it. From my research it sounds like I should be able to just ...
fracai's user avatar
  • 111
1 vote
0 answers
343 views

How can I add a common "C" wire to my thermostat? [duplicate]

Possible Duplicate: Options for adding “C” wire to thermostat I recently bought the Honeywell THM5320R Wireless thermostat. After going to hook it up I found what many others have, it requires a ...
J. Edwards's user avatar
0 votes
0 answers
140 views

HVAC adding C wire to older system w/ wire nuts

I have an older system, separate AC and gas heat. Trying to add a C wire. All existing wires are connected outside the air handler with wire nuts. I've unwrapped an unused blue in the lower right of ...
Richard's user avatar

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