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Which color wires do I connect to I- and I+ on my Lennox digital thermostat?

I have a 95% efficient furnace installed in 2009. I have a digital Hunter thermostat with typical wire coding. RC; R; GN; WH; BL. This new thermostat has: R; I-; I=; C for connections. I assume R is the Red wire. What wires do I connect to the other 3 connections/ The furnace has no wire on the "C" connection, and Blue wire is on the "Y" connection. Thanks for any assistance. I can't believe Lennox does not explain this in the connection procedure and their customer service has absolutely no technical assistance. If I could, I would take this back and get my money back. Poor customer support is a big issue for me.

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Sounds like the i comfort tstat which is a communicating tstat. You would need to purchase the interface module to connect your legacy style furnace to a communicating tstat. Yes r is 24v and c is common but i+ and i- are data wires.

Posted on Sep 14, 2017

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  • Contributor
  • 47 Answers

Can you give me more info on the thermostat? Model number maybe or Lennox Elite for example? I have never heard of these I numbers but would like to do some research on it.

Posted on Nov 25, 2014

  • Jim Burcham
    Jim Burcham Sep 12, 2017

    I have same issue - want to change from Lennox iComfort touch screen thermostat to a NEST. Where to connect the wires from the Lennox iComfort on to the Nest.... Thanks

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 7 Answers

SOURCE: changing thermostat matching wires trouble

Brown my friend is for the 4 way valve solenoid, that is if you have a heat pump, ( it uses freon for heating instead of natural gas) perhaps you got the wrong thermostat, if you have a brown you need a thermostat for a heat pump, a regular thermostat is not going to have a brown connection.

Posted on May 08, 2008

chillmaster
  • 104 Answers

SOURCE: Manual Thermostat replcaement with Programmable Digital unit.

Hopefully there are markings on the old t-stat as to what terminal is what.
on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
R- red
AUX-white
Y- yellow
B- O/B
C- black
G- green
There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
170-7
190-1
200-0
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters

Posted on Jun 18, 2008

  • 306 Answers

SOURCE: Outside a/c unit hasnt powered on yet and I want to make sure my RH and RC wires are correct.

Connect the red to RH

Go down to the furnace and look at the circuit board and note what color's go where. Most units only use 4 wires.

Should be
RED to RH
YELLOW to Y
WHITE to W
GREEN to G

Then from there two wires go to condenser outside. And they connect to Y and C on the board. Most of the time Red and White from outside. Don't get confused with Red coming from thermostat. Let me know Ken

Posted on Apr 26, 2009

  • 252 Answers

SOURCE: where does the red wire on digital them go rh or rc

can connect to either - leave the jumper

Posted on May 16, 2009

  • 24 Answers

SOURCE: Need help with wiring thermostat

first do you have a heat pump unit or standard a/c? standard a/c connections at the thermostat go like this red wire to rh-rc which is the 24v power and you don't have to remove the jumper.white goes to w which is the heating wire yellow goes to y which is the cooling wire green goes to g which is the fan wire and blue goes to c which is the common wire. so if your stat has rc- rh ywgc you should be set if the wires on the furnace correspond with the same alpha designation.orange may be used if u have a heat pump unit otherwise it may just be a spare you cap off and leave behind the subplate.

Posted on May 31, 2009

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1 Answer

I want to connect a NEST thermostat with WiFi to my Lennox furnace. The existing iComfort by lennox has 4 wires, R, I+, I-, and C. Where would these connect on the Nest?


They don't. And why would you want to trade it out??? You are currently running off the communicating terminals. If you are going to install a nest you will have to match the nest wiring with the legacy/24volt terminals on the furnace control board and likely the outdoor unit will need rewired as well. Not extremely difficult but why??? The nest is not what it's cracked up to be!!

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On that thermostat there is an R and an RC wire connection, the R is the power wire for heat and RC is the power wire for cooling. If you connected the power wire (normally red in color) to the RC only the fan control and AC control will work, there has to be a jumper wire between the R and RC terminals (assuming there is only one control transformer) for both the heat and cool functions to work.

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What is the blue wire for


Blue is usually a common/ground in standard 5 wire applications. Older installations have 4 wires where the blue was used for cooling. It really depends on what you have and what you need. Thermostats only need the common wire when there are no batteries and it uses the furnace to power the thermostat. This is the normal wiring for most systems:

Red(R)- Power/24v
Green(G)- Fan/Blower
White(W)- Heat
Yellow(Y)- Cooling
Blue(B)/(C)- Common

That is for common conventional systems. Heat pump systems and some high efficiency systems have more than 5 wires. Other wires you may have:

W2- 2nd stage heat
Y2- 2nd stage cooling
Orange(O)- Reversing valve for heat pumps.
These wires can be different colors depending on the installer that connected them. Hope this helps and good luck!

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