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Thermostat wiring I have a Trane XL 80, 2 stage system. I'm replacing the Trane thermostat with a Lux 9100 E. One of the wiring options is for a 5 wire system with 2 transformers. How do I determine if I have 1 or 2 transformers? Thanks

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99.99% of the modern residential units use only one transformer to power the 24 volts for both the furnace and the a/c unit. It will be located in the furnace. The outdoor unit will not have its own transformer unless its reeallllly old. Place a small jumper wire between w1 & w2 terminals on the thermostat. (The lux brand is not the professionals choice) (if you have problems replace with a honeywell or white rodgers brand).
Good luck.....

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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I recently installed a Honeywell RTH6350D to replace a 2 year old LUX and can get everything to work but the heat(reason for replacing the LUX). Works sometimes but not consistantly. Have the common red(R)...


R represents power supply for the heat system.
RC represents power supply for cooling system.
G represents fan (neutral).
W represents heat system.
Y represents cooling system.
Y2 represents 2nd stage cooling.
W2 represents 2nd stage heating.
AUX represents heat pump.
Try calling 1-800-468-1502.
Their english is "REALLY BAD"!!!

Jan 02, 2011 | Honeywell Electronic Programmable...

Tip

Lux Thermostat 500


The Lux 500 Thermostat is an affordable programmable thermostat that gives you a very easy way to customize your heating and cooling temperatures to your schedule. The programming of this thermostat is easily the simplest that I have found in a programmable t-stat.

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The Lux 500 series thermostats are a great economical way to reduce energy and utility expenses by raising or lowering your temperature settings a the times you set. The installation is so easy that most any DIY’er can install this thermostat. It has an easy to read display and the rotary dial makes the programming very user friendly.

A few of the other great features of this unit are, a keyboard lockout, and an air filter reminder.

This thermostat can be used on any 24v AC or 750mV single stage conventional heating/cooling system. Single stage heat pumps without auxiliary heat will also work with this thermostat.

Here is a summary of the features of this thermostat

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  • 5 - 2 Day programming
  • 4 Periods per day
  • Large easy-to-read display
  • LUX patented user-friendly Speed Dial®
  • Filter usage monitor and alert
  • Default Energy Star approved program
  • Temporary Temperature Override
  • Temperature Hold
  • Keyboard Lockout
  • Temperature Calibration
  • Swing Settings #1 - #9
  • Fahrenheit or Celsius temperature Scale
  • 12/24 Time Format
  • Low Battery Warning Indicator
  • Mercury Free


As you can see this thermostat will give you a lot of great features at an affordable price.

on Jan 16, 2010 | Heating & Cooling

1 Answer

I have a Trane heat pump, model #TWP060C300A and a Trane air handler, model #TWE065E130A. Heat pump is 5.0 ton, split system. Air handler has a variable speed motor and a 20Kw 3-phase auxiliary heat strip....


Honeywell Chronotherm thermostats have always had a great reputation for longevity and reliability. They are also much more user-friendly than the other types of programmable thermostats out there. Make sure you get one that states 2-stage heat, heat pump. T8611G will offer that for you. There are many out there that claim to be suitable for heat pumps; however, they do not have the ability to utilize your auxiliary heat strips (2nd stage of heat).
Before you attempt to replace, be sure to write the wire colors and their corresponding terminal marking on a sheet of paper........of your old thermostat. This is very important to make it easier to hook up the new thermostat. Also, before you disconnect the wires, be sure to shut off the circuit breaker to your air handling unit. You can ensure you have the right one by putting the fan switch in "ON". When you turn off the right breaker, the fan will stop running. :-)

I hope you find this information to be very helpful to you. Please don't forget to leave a rating.

May 09, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a honeywell ct3200 with a trane xl 80 furnace. it will cycle on to the right temp, go off and cycle the furnace back on 30 seconds later. Is that normal? It is 32 degrees outside, set at 68


Hi, check page 22 in your manual, it says "Adjust the screws on the back of the thermostat as instructed on page 7." Your furnace is a 80% efficiency but is also a high efficiency 2 stage heating system so try adjusting screws A and B both ways and see which gives you the correct cycling.
Your manual is here:
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0653.pdf

Jan 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Hi I am replacing a trane thermostat it has 8


call hunter fan co. you will have to jump out some term.

Jul 01, 2009 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

Thermostat wiring


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Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

Jun 02, 2009 | Carrier Heating & Cooling

1 Answer

Need wiring for honeywell pro 3000 in trane xe1200


the pro 300 is a single stage thermostat and can not be wired to control 2 heat stages seperately

May 16, 2009 | Heating & Cooling

1 Answer

Changing to a digital thermostat


you cant use this thermostat . you have a trane 2 stage heatpump the hunter thermostat is made for a one stage heatpump ...if this answer helped please rate this 3 or 4 stars , this will keep me in the paid answer department

Apr 06, 2009 | Heating & Cooling

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