Old Honeywell Thermostat Wiring Diagram

It s used for systems that don t provide a c wire but have a thermostat that requires one.

Old honeywell thermostat wiring diagram. Use the wiring cross reference table below to match each old thermostat wire with its corresponding terminal on the ct87 wallplate or subbase. Our page top sketch courtesy of honeywell controls illustrates the wiring diagram for a traditional honeywell t87f thermostat used for 2 wire single pole single i am trying to wire an rth series honeywell thermostat and i followed what i believe is the correct wiring diagram but nothing is kicking on. The honeywell home trademark is used under license from honeywell international inc. The model number of the honeywell thermostat was not provided however here are the typical wiring assignments for a conventional heating system.

Orange this wire connects to your heat pump if you have one. Honeywell thermostat wiring diagram wires. Honeywell wire saver modules combine the y and g wires to form a single k wire that connects to the k terminal on some honeywell thermostats. Keep in mind that there should be a low voltage cable in the wall where the thermostat is located which has individual wires as shown in the instructions below.

The table above provides a more complete list of honeywell thermostat wiring colors and their uses. Honeywell thermostat rthb wiring diagram. White the white wire is what connects to the auxiliary heat on your system. Strip the wire insulation as needed to fit the wires underneath the ter minal screws.

Never attach wires to both the b and o terminals. Our wiring diagrams section details a selection of key wiring diagrams focused around typical sundial s and y plans. Also see these other honeywellt87 wall thermostat wiring diagrams honeywell wall t87 f type thermostats for sketches and drawings of honeywell thermostat wiring hookups. Install the honeywell lyric thermostat like a pro.

Honeywell thermostat wiring diagram 4 wire examples. Red now there can be two separate wires for this. Yellow the yellow wire connects to your compressor. These wires run directly outside and provide outdoor temperature information to the thermostat.

But here is a list of the most common wire color mappings as seen in many four wire t stat setups. At left the thermostat wiring diagram illustrates use of a honeywell t87f thermostat in a 2 wire application controlling a gas fired heating appliance. Wire the thermostat 1. Green the green wire connects to the fan.

C 24 vac common you might see blue purple or brown typically used for this wire. 4 wire honeywell thermostat wiring diagram a pcb layout is the resulting design from taking a schematic once specific components and determining how they will physically be laid out upon a.