No common wire required
Common wire required
Not compatible
The common wire could be labeled “C”, “B” or “X” on the old thermostat. Please refer to the owner’s manual of the old thermostat.
What if I don’t have a common wire and need one?
There are a few options if the application does not have or will not allow the pulling of a common wire (c-wire) through the wall.
No jumpers required
Heat pump jumper wires
two transformer – conventional single-stage or two-stage systems
Quick tip: Thermostat wiring does not follow a standardized color code. Take a picture with your smart phone and label thermostat wires before removing old thermostat from the wall.
heat pumps single-stage or multi-stage systems
Quick tip: Thermostat wiring does not follow a standardized color code. Take a picture with your smart phone and label thermostat wires before removing old thermostat from the wall.
Separate W2 and E Wires
B Terminal Wires
Note that Y2/* and W2/* are being used for wired humidification or dehumidification, respectively
System Compatibility List – Humidity Control
Note: if the staging on a 2 stage heat or 2 stage cool system can be handled by the furnace/air handler board, that will open up the Y2 or W2 terminal for hum/dehum use.
Installation
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Smart Thermostat
1F87U-42WF Installation Training
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Download manual:
Emerson Sensi 1F87U-42WF Smart Thermostat Installation Manual
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Emerson Sensi 1F87U-42WF Smart Thermostat User Manual
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