The following wiring configurations are compatible with the iDevices Thermostat. Locate the wiring that matches closest to your system. You will also need to know the system stage and type for reference when setting your iDevices Thermostat.
iDevices Thermostat requires a 24V Common or ‘C’ wire, which provides power for features like Wi-Fi connectivity and the backlit display. If your current Thermostat does not have a 24V common wire there are some options available for compatibility, visit: Locating the Required 24V Common Wire
Identify the Available R Wires
- Check the wiring at your old thermostat to see if it has one or two R wires.
- If you have one R wire, connect it to RH at the iDevices Thermostat and leave the blue jumper in-place to RC.
- If you have two R wires, connect RC to RC and R/RH to RH and remove the jumper.
Note: In the diagrams below, the dotted lines indicate optional wires that may not be applicable to your specific HVAC system.
Heat Only (One, Two or Three Stages)
Stage: Non-HP
Type: HE for electric, HG for gas/oil systems
Fan wire G optional for HG type
G wire is not required for hot-water baseboard or steam radiator systems. If the G wire is not connected for warm air heating systems, the "Fan On" mode will not be available. Connect the W2 wire (2nd Stage Heat) if available. The HUM relay can be used for Humidification, Dehumidification or as a W3 (3rd Stage Heat) relay.
Cool Only (One or Two Stages)
Stage: Non-HP
Type: HE
The Y2 wire (2nd Stage Cooling) is optional if available. The HUM relay can be used for Humidification, Dehumidification or as a W3 (3rd Stage Heat) relay.
Heat (One, Two or Three Stages) and Cool (One or Two Stages)
Stage: Non-HP
Type: HE for electric, HG for gas/oil systems
The Y2 wire (2nd Stage Cooling) and W2 wire (2nd Stage Heating) are optional if available. The HUM relay can be used for Humidification, Dehumidification or as a W3 (3rd Stage Heat) relay.
Heat Pump (One or Two Stages with AUX/ Emergency Heat)
Stage: HP
Type: HE for electric, HG for gas/oil systems
O/B Type: According to the previous thermostat setting
The System Indicator (L), 2nd Stage (Y2) and Emergency Heat (E) wires are optional if available. The HUM relay can be used for Humidification, Dehumidification or as an Aux (Auxiliary Heat) relay.