Question about Honeywell Programmable Thermostat Heater

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WHERE TO CONECT THE 2 WIRES TO THE NEW THERMOSTAT

I HAV 2 WIRES THAT WAS CONNECTED TO OLD UNIT THAT CONTROLS A GAS HEATER.
WHERE SHOULD I CONNECT THESE 2 WIRES ON THE NEW UNIT?

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Connect one to Red, R or Rh.
Connect the other to White or W.

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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See RC and RH, RC is for cool, RH is for heat, you wire the red wire to the RH or red terminal ,either one will work actually but we generally switch the hot leg of power, W is the heat circuit


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W and W2 wiring on old thermostat...where do they go on the new thermostat?


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
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My old thermostat had 4 wires connected to it, I have 5 wires white black ,blue,yellow and red. the wasn't connected to the old thermostat.Do i need to connect the red one to the new thermostat because...


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I AM REPLACING THE HEADER IN H250FDN HEATER. NEW HEADER INSTRUCTIONS MATCH OLD HEADER AND NUMBERS MATCH ON OLD AND NEW BUT NEW HEADER IS DIFFERENT. OLD HEADER HAS 2 LIMIT ON BOTTOM NEW ONE HAS 1 ON BOTTOM...


As long as it still has 2 hi limit switches, this will be easy.

You will need one wire going from one limit switch to the other. (on any terminal)
take either of the incoming wires from the old limit wiring and connect to second terminal on either limit switch.
Now take the last remaining wire and connect ot to the last terminal on the second limit switch.

Basically, you are just creating a bridge. Power will go into first limit switch, then go into the second limit switch via the first wire indicated above. Then the power will go back out to the pc board. If a high limit switch trips, then power is cut off (cicuit opens) and it tells the cpu there is a problem and shuts down the heater.

So to simplify: connect the wire in between the two limit switches. Then put the other 2 wires anywhere.

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I am hooking up a leviton 1755 3 rocker switch that controls a light, fan, heater all in one ceiling unit. The old switch had the white wire in the top switch, one black in the middle and the other black...


1) Look at screw color.
New device has brass screws on one side, and 1 silver screw for each switch located on other side of device.
Hot wire goes to brass screw.
Wire to fan goes to one silver screw
Wire to light goes to another silver screw.
Wire to heater goes to another silver screw.

If you do not have a wire for each individual Load, then you will have to add wiring.

2) Electricians don't guess, they test.
Separate wires for testing.
Turn power ON.
Test each wire to bare ground wire.
Tester lights up on Hot wire.
Hot wire connects to brass-colored screw.
If any wires on old switch was connected to same Hot wire, then also connect that wire to brass-colored screws.

Hot wire is identified.
Test Hot wire to each other wire in box, except bare ground.
Tester lights up on Neutral wire. Neutral wire will NOT connect to this switching device.
Next, connect one of the remaining wires to a silver screw.
Turn power ON.
Flip switch to see what Load that wire controls.
By process of elimination, add wires to each silver screw and test each by flipping switch.
Breaker will trip if you connect Neutral to silver screw.

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The dial that controls the heat and cool pulls 2 wires, one that is blue that is next to the gas pedal on the heater core box, that one just snaps off. It lets the hot air in from the heater core or the other way it moves the box to let A/C through.
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Review old switches:
Two old switches > each has 2 wires
Old switch 1 > Red and White
Old switch 2 > Black and White
The same white wire connects to both switches, so effectively they count as 1 wire
This means you have 3 wires ... 1 White, 1 Red, 1 Black
Each switch controls a separate load (light, fan, motor)

New Leviton double-rocker switch:
-Leviton has 2 Brass-colored screws on one side, and these screws are connected together by a brass plate >> your Hot wire will connect to brass screw
-Leviton has 2 Silver-colored screws on other side, and neither of these screws are connected in any way >> the wires going to each load will connect on a different screw on this side of switch.

Hot wire: Each box in your house has exactly 1 hot wire that is connected back to breaker box. This is true for all boxes (excluding boxes that have a 3-way & 4-way switches).
We need to identify Hot wire.

-By code the Hot wire is black for identification purposes ... but your box sounds like maybe the Hot wire is White.
-If your Hot wire is white, that is NOT an immediate safety issue ... it will not cause a fire or malfunction ... it is a code violation ... because code requires things be uniform so next electrician knows what previous guy did. So some day, electrician working outside grabs wrong color wire, and wow. I say this so you know.

Moving on.

Identify Hot wire:
-Pull 3 wires up so they can be tested
-Turn on power
-Use ordinary tester, or old lamp with plug cut off and wires stripped back
-Tape tester lead to sticks so hands are away from voltage
-Power is on. Don't stand in water or touch metal pipes, and you're fine.
-You have 3 wires in box + ground wire
-Test all 3 wires to bare ground wire >> when tester lights up, that is Hot wire ... testing is complete

Connect wires to Leviton double-rocker:
-Power is OFF.
-You have 3 wires - 1 White, 1 Black, 1 Red >> one is Hot wire, the other two wires go to load
-Hot wire connects to Brass-colored screws on new Leviton.
-Brass colored screws are connected together by a brass plate so the Hot does not need to connect to both brass screws.
-The other two wires connect to Silver screws on other side of new Leviton switch
-One wire goes to each silver screw
-Connect bare ground wire to green screw.
-Push wires back into box. Use eraser end of pencil if needed.
-Make sure ground wire is back and away from screws on switch
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