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I am intsalling a Honeywell RTHL3550. I had an old mercury white-rodgers thermostat. All of my wires match up except the W2 wire. I have a heat pump so I was following the wiring key on the bottom.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Hunter 44100A programmable thermostat

Sorry Iasumed you had a heat pump t-stat. You will need to exchange to a heat pump t-stat

Posted on Sep 28, 2008

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meBNme
  • 334 Answers

SOURCE: Old thermostat wiring doesnt match up with new thermostat

Look at the instuction booklet (or on the T-stat board) for a switch for the reversing valve.

Some systems reversing valves are in cooling mode when energised, some are in cooling mode when NOT energised.
You are looking for the switch (Usually very tiny, or a different jumper setting) that will change the position of the reversing valve when calling for heat/AC.

This is not a switch like the typical "ON OFF AUTO, HEAT COOL EMG HT switches. It will be on the board itself or the back of the T-stat.

Posted on Dec 06, 2008

machtcl1
  • 61 Answers

SOURCE: Thermostat Wiring: W2? E? Where to connect?

You have a heat pump. You need a thermostat for "Heat pump with Electric back-up heat". Make sure the 'stat has either an "aux" (auxilliary heat) or an "E"(Emergency heat) terminal. The wiring instructions will be provided with the thermostat.

Posted on Dec 16, 2008

  • 96 Answers

SOURCE: 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

Posted on Feb 01, 2009

shastalaker7
  • 1515 Answers

SOURCE: I replaced a Lennox DSL-450LX heat pump thermostat

Hi, If indeed you do have a heat pump, there wouldn't be any gas involved as a heat pump runs on freon with a reversing valve and heat strips for aux and emerg. heat. For gas electric operation thermostat terminals are rc to rh with factory jumper. Red wire to either.W to W for Heat, Y to Y for cooling G to G for Fan. If you have a blue, you wont need it unless this is a commercial stat useing a common for the Led lights on the stat. The unit will get its 24volts through R terminal in combination with y,w,and,g. Cant be a heat-pump if you have a gas furnace.Wrong t-stat. You need a gas /elect stat. And on a 24volt programmable t-stat, the batterys are used for the program only.If the batterys die, than you will loose the program on most residential stats. On commercial stats with the common in play, when batters die the stat defaults back to the factory settings.If you had a Lennox heat-pump stat on a gas/elect unit, you need to change it. Someone was using what they had on hand. Let me know if this has helped you.I will be here if you need me. Sincerely,
Shastalaker7

Posted on Nov 17, 2009

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Need help understanding how to wire a new programmeable thermostat. I currently have a White Rodgers 1F73 model (non-programmeable) connected. I am confused with the instructions on how to connect the...


the black wire is your common wire, you need to program your thermostat, in the advance mode, to tell the t-stat if your heat pump reversing valve is energized on cooling or heating, is the orange wire connected to your t-stat.= w2/o/b

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The Orange wire for the reversing valve and used with a Heat Pump
If you have a heat pump, then yes. If you have a gas furnace then no. If you have a HP and the reversing valve is not connected, then you might just be using the emergency electric heat strips. :-o

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I am replacing an T8411R with RTHL3550 and I have the following wires. Original vs New G=G,R=R,Y=Y,O=O......? I have a W2 and an E wire that go into different screws on original but no seperate terminal...


C is actually a power wire; it provides power for some programmable thermostats. You don't have to connect it on the new thermostat; cover the end with electrical tape to avoid it causing a short. (If you keep that wire accessible, it will be nice for someone who wants to use another programmable thermostat. The ones which can talk to wireless networks require this wire.)

Do you have a heat pump? That is the only time a thermostat uses an E wire.

The W2 wire should go to AUX (third screw terminal from the left) and the E wire should go to E (second screw terminal from the left). See page 25 (27 on the pdf) of the Quick Installation manual for the RTHL3550. This manual is available from Honeywell at http://yourhome.honeywell.com/home/Products/Thermostats/Digital-Non-Programmable/RTHL3550D.htm .

I hope this helps.

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It depends on the equipment you are connecting the thermostat to. If you have a heat pump, the thermostat must be wired differently than if you have separate heating and cooling equipment. If you have a two-stage or modulating furnace (or boiler), the w and w2 wires will conect for heating, and the y and g wires will connect to the air conditioner. Naturally, some configuring must be done with the new thermostat so that it acts correctly. w-w2-wiring-old-thermostat-go-new-u40lsvyytnuesyuv3fbafhtd-1-0.jpg
please mark this answer helpful.

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The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

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Bill ..You dont have a heat pump.This controller will not work for a conventional system. Get the right thermostat

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You have a heat pump. You need a thermostat for "Heat pump with Electric back-up heat". Make sure the 'stat has either an "aux" (auxilliary heat) or an "E"(Emergency heat) terminal. The wiring instructions will be provided with the thermostat.

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I am replacing a white rodgers thermostat with a honeywell rth3100c. i have matched my wire as e (brown) to e w2 (white) o aux y (yellow) to y g (green) to g o (orange) to o l blank r (red) t r b blank c...


Blue (C) or sometimes (B) should be your common wire. Look at your schematics and locate common. Your Brown wire is (E) and is emergency heat, white wire (W) is Auxilary Heat, green wire (G) is fan relay, red wire (R) is power, yellow wire (Y) is Cooling and orange wire (O) is reversing valve.

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