Honeywell programmable thermostat hook up

honeywell programmable thermostat hook up

How do you hook up a Honeywell thermostat to a furnace?

Connect it to the G terminal and set jumper JP1 on the back of the thermostat to the HE position if the furnace is electric. Leave it in the HG position for a gas or oil furnace. If the Honeywell thermostat installation is to control an air conditioning system, youll have an R wire for power and a W wire to control the air conditioner.

What is the HG wire on a Honeywell thermostat?

Leave it in the HG position for a gas or oil furnace. If the Honeywell thermostat installation is to control an air conditioning system, youll have an R wire for power and a W wire to control the air conditioner. You may also have a Y wire (yellow) to control the compressor motor.

How to connect a heat pump to a thermostat?

This ensures the system heats in the heat mode and cools in the cool mode. When the thermostat controls a heat pump, both the Y and W terminals are used, but you may have only one of these wires. In that case, install a jumper wire between the Y and W terminals to connect them and attach the wire you have to the appropriate terminal.

What does the R wire do on a Honeywell thermostat?

If the Honeywell thermostat installation is to control an air conditioning system, youll have an R wire for power and a W wire to control the air conditioner. You may also have a Y wire (yellow) to control the compressor motor.

How do I install a Honeywell thermostat?

If the Honeywell thermostat installation is to control an air conditioning system, youll have an R wire for power and a W wire to control the air conditioner. You may also have a Y wire (yellow) to control the compressor motor. Attach this to the Y terminal. If the heating/cooling system includes a heat pump, youll find at least one extra wire.

How do you wire a thermostat to a furnace?

If the thermostat is going to control a furnace, youll have at least two wires. One is the power wire, labeled R (red), and the other controls the furnace. It should be labeled W (white). Connect these wires to the appropriate terminals. If the system has a separate fan control, youll see a third wire labeled G (green).

Can a Honeywell thermostat have 2 wires?

Either way, if there are only two wires, your choices for a new thermostat are limited to mechanical or battery-powered models. If youre looking for a Honeywell two-wire thermostat, you cant do much better than the Honeywell T87 series.

Where does the Y wire go on a thermostat?

This wire will go to the G terminal on your new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. The O/B wire can have many configurations.

What is the R wire on a thermostat?

An R wire is similar to either the RC or the RH, so if you don’t have an RH wire, the R wire will be in place to control the heating system. Aside from the RH and the RC wires, there are other wires that you will find in your cooling or heating system.

What wire do I use to hook up a thermostat?

If your system has both heating and cooling functions, youll need to connect both the Rc and Rh terminals with a red wire. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire.

Where is the jumper wire on a Honeywell thermostat?

The wiring for your Honeywell thermostat depends on the functions of your heating and cooling system. Youll probably see a thermostat jumper wire connecting the Rc and Rh terminals. Its there so you can supply power to the heating and cooling switches with a single wire, which is usually red.

What does the R wire do in HVAC?

If you just have an R wire, it’s responsible for powering your entire HVAC system (through the use of a transformer ). If you have both an Rh and an Rc wire, the former powers the heating and the latter powers the cooling (using two separate transformers). If, for example, you have an R wire and an Rc wire, the R wire controls the heating system.

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