Honeywell 7400 Thermostat Wiring Diagram

If your old thermostat had separate o and b wires attach the b wire to the c terminal.

Honeywell 7400 thermostat wiring diagram. C 24 vac common you might see blue purple or brown typically used for this wire. References for honeywell smart thermostat wiring. Battery installation rth7400 rth7500 about your new thermostat install batteries install 2 fresh aa alkaline batteries in back of thermostat. Step 4 label each thermostat wire at the thermostat location with the appropriate terminal letter designation using the labels provided with the honeywell rth7500.

Advanced installation guide 69 2221ef 03 22 about your new thermostat setup wiring assistance troubleshooting connect wires. Revised the tags list. Follow special instructions cont 5. The honeywell home trademark is used under license from honeywell international inc.

The wiring for your honeywell thermostat depends on the functions of your heating and cooling system. It s there so you can supply power to the heating and cooling switches with a single wire which is usually red. Typically y on a conventional forced air furnace with air conditioning corresponds to a y on the thermostat but is connected by the blue wire not the yellow wire. But here is a list of the most common wire color mappings as seen in many four wire t stat setups.

Page 9 step 4. In the honeywell t87f thermostat series the single pole double throw switch makes closes one set of contacts when the temperature. If you have only one c and or c1 wire connected to your old thermostat connect this wire to c on the new thermostat. Added key word targeting for honeywell smart thermostat wiring removed ad code and added more tags and links.

Old thermostat letter designation screw terminal wire wire hole connect to the c on the new thermostat m22223 69 1726 1. From smart wifi thermostats with room sensors and humidification control to programmable and non programmable thermostats resideo products meet a variety of needs. Honeywell thermostat wiring diagram 4 wire examples. You ll probably see a thermostat jumper wire connecting the rc and rh terminals.

Install the honeywell wi fi smart thermostat in a snap from cnet. Use a screwdriver to loosen screws insert wires into hole under screw then tighten screws until wire is secure. 2 wire gas heat honeywell t87f thermostat wiring diagram. At left the thermostat wiring diagram illustrates use of a honeywell t87f thermostat in a 2 wire application controlling a gas fired heating appliance.

The table above provides a more complete list of honeywell thermostat wiring colors and their uses. Follow special instructions cont 4.