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BAY28X153A need to wire to new thermostat

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Wiring Honeywell 9580 to old furnace with no C wire


This is not going to be easy. Check the wiring in the wall to look for the third wire. If they did not run one, you have to run new wire to the furnace and thermostat. If they stapled that wire to the walls inside studs, then it is going to be even harder to run the new wire. Once you run that new wire then you have to locate the connection in the furnace that has the common (c) wire for the transformer. Check you tube to see if the have any how to video.

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1 Answer

Rheem Heat Pump Thermostat Replacement (#41-20804-15)


you need a 2 stage heat and cool t-stat hunter t-stat is not 2 stage

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1 Answer

Can I change a arcoaire thermostat (mercury) with a White Rodgers Digital thermostat? The digital is very easy to install. Is is easy to dismantle the arcoaire?


If you have heat and air there needs to be 5 wires inside the thermostat, heat pump will need six. If you have heat only there will need to be three wires. If not, the new thermostat will only operate on batteries. Pay close attention to which wires go where and make them correspond on the new thermostat. Also remember mercury is a hazards waste product. Please recycle responsibly.

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1 Answer

Need wiring diagram for Honeywell RCT8100


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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2 Answers

I bought a Honeywell programmable thermostat RTH2310 to replace my 10 year old Honeywell thermostat. My old thermostat is a 4 wire system but also has a jumper from Y to 1. New system does not tell me what...


It depends on the type of thermostat you have.
Do you have a 4 wire or 5 wire T'stat?
The red jumper wire was for a 5 wire t'stat with 1 transformer, the red jumper actually should have been from R to 1.
So you need to trace the wires back to the furnace and make sure they go to the locations identified below.
if you have a 4 wire t'stat then you don't need that jumper, if you have a 5 wire t'stat then you do need that jumper but it should go from Rh to Rc.
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
t'stat?

Nov 14, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Switching old thermostat to Hunter thermostat model 44155c


By describing the wires from your new thermostat and your old one, it sounds like your new thermostat is not compatible with your system. If you have seven wires now, then you more than likely have a heat pump system and you have to get a thermostat that is compatible with this type of system. Then you will have the connections you need.

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1 Answer

Honeywell Electric Baseboard Heater thermostat


You need to take the wires off the thermostat. And touch the red and white wire together. If the heater works then you need a new thermostat, if it does not work then you need a new ignitor. It all depends on the t-stat. Dont worry about the wires there are not enough volts to hurt you. It is milli volts so just touch them together and the unit should fire up

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1 Answer

Old mercury thermostat, New furnace wiring issues


Two wire hookup on the old thermostat tells me that it was set up for heating only. You will most likely need a modern thermostat. But in the meantime try this with the old one. The two red wires on the furnace are probably Rh & Rc. If so these can be put "together" on the R terminal on the old stat. The two W's on the new furnace are probably W1 &v W2 This is for first and second stage heat. You can put the two "together" on the W terminal on the old stat. Do not hook up the greens (blower fan wires). Do not hook up the blue wires (They would go to the Y terminal on a modern stat for airconditioning.
Who ever sold you the furnace should have offered you a new thermostat.
Good luck....

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1 Answer

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your old thermostat is a milivolt and the wire runs from the heater to the thermostat. You have to open the back of the new one and connect the wire as per the instructions on the wireing diagram that came with the new one. I just installed a similar one myself, you will be very happy with it.

Jan 24, 2009 | Honeywell Electronic Programmable...

1 Answer

Blower not working with new thermostat


To get the fan to work, look at the heating system to see what termoinal the blue wire is connected to. It should be the "G" terminal. If so, connect the blue wire to the "G" terminal on the thermostat and then manualy switch the thermostat to "Fan On". Indicate what terminals you have on your new thermonsta ie "G" "R" "Y" "C" "W" etc... For a fan to work, typically you connect "R" to "G" on the furnace.

Nov 05, 2008 | Honeywell Programmable Thermostat Heater

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