Help with thermostat wiring..please


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Old 06-03-22, 05:35 PM
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Help with thermostat wiring..please

Good evening all. I just installed a heat pump and I am in the process of wiring up the thermostat. The the wires going to the thermostat have got me confused. Some of them don't match with the schematic from the heat pump and what is on the label inside the thermostat. Any help is greatly

appreciated.

 
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Old 06-03-22, 06:03 PM
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Looks like a very basic thermostat. Battery operated.
Make sure it can handle a heat pump with back up electric heat.
Since it uses batteries.... there is no C terminal.

O = orange
Y = yellow
R/Rc (jumper in place) = red
G = green
W = white

B = not used
 
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Old 06-05-22, 01:01 PM
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Thanks for the input. I did have to return and pickup one that supports backup heat. Here is the installation instructions. Going back to my original picture of the hvac wiring diagram, does :

1.the W1(brown wire) from the air handler go to w/e on the new thermostat
2. does c(blue wire) on the air handler go to c on the thermostat.
3. I'm assuming W1(white wire) from air handler goes to W2 on new thermostat

and rest is:
Orange to orange
Red to red
Green to green
Also, what is the purpose of having a thermostat outside? We have a woodmaster 4400 outdoor boiler. I installed the emergency heat strip but if it's that cold we will have a fire going. But thought if it's there then its always an option. What gets us is when it's not cold enough to really have a fire but still need a little heat at night. I'll be running 2 thermostats. One for the boiler and one for the heat pump.


 

Last edited by Mmarmino; 06-05-22 at 01:47 PM.
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Old 06-06-22, 01:33 AM
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An outdoor sensor connected to a thermostat can tell the heat pump to shut down and switch solely to back up heat.

You only have a single stage re-heat. It is controlled by the white wire. It's called W1.
Put the white wire on W/E.
If you notice.... the brown wire connects to the same place as the white so both wires do the same thing.
 
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Old 06-06-22, 11:28 AM
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So white on the thermostat to W/e, what about the brown at the thermostat since I have no e terminal on the thermostat?

And blue from c to c...correct?
 
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Old 06-06-22, 11:36 AM
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Since e coming from the airhandler in emergency heat, I assume that should go to W/E also? Or no??
 
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Old 06-06-22, 11:40 AM
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Yes...use blue for C
The brown wire is not required.
W/E is auxiliary heat plus emergency heat.

Aux means the heat strips will work with the heat pump automatically.
E means emergency. It shuts the heat pump off and runs just the heat strips.
 
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Old 06-06-22, 11:44 AM
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Just to be sure. The heat strip will only come on if the switch is in the EMH position? And thanks for all the help! It's really appreciated!


 
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Old 06-06-22, 02:24 PM
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No... I explained it.
In heat mode it's the heat pump and when it gets too cold and the heat pump can't keep up.... it's the heat strip and the heat pump.

When you go to EM heat..... the heat pump is shut down and just the reheats are active.
 
 

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