Simple 2 Wire Thermostat Wiring

The thermostat wiring on these systems can have very similar wiring properties.

Simple 2 wire thermostat wiring. Multi stage systems can require up to 8 conductors because of the amount of communication needed between the thermostat and air handler or furnace. Honeywell prestige wiring requirements need a minimum of 5 wires and maybe more depending on what features you want to operate humidifier etcthe additional 5th wire will be for common. In the honeywell t87f thermostat series the single pole double throw switch makes closes one set of contacts when the temperature falls to turn on the heating appliance. The colors associated with these terminals are red and white so if the wires coming out of your wall are these colors simply connect the red one to the r terminal and the white one to the w terminal.

A basic two wire thermostat can be compared to a simple single pole switch that you will find throughout your home only instead of you turning the switch on and off as required a mechanical or electronic temperature controlled mechanism is the operator of the switch. If youre still a little confused and i can understand why you would be i have added a thermostat wiring made simple video for you to look at which isnt very long but is one of the best explanations i have come across. If you use a thermostat with more terminals but you only have two wires you can ignore all the other terminals except for these two. 18 gauge thermostat wire is recommended for any distances up to 250 feet.

How to install a honeywell thermostat with only 2 wires available. Most homeowners with moderate home improvement skills can wire a heat only thermostat. The simplest setup for a heating system is a two wire thermostat. We do not cover 110240 volt thermostat wiring and millivolt thermostat wiring issues.

G fan green wire. If any cooling like an air conditioner or fan control is required more wires are needed. To wire a thermostat you must first be aware of the type of system that you have in your home. At left the thermostat wiring diagram illustrates use of a honeywell t87f thermostat in a 2 wire application controlling a gas fired heating appliance.

And it has been recorded by a professional in the industry. Some programmable thermostats eg. Providing stepped down power from a transformer. 5 wire honeywell thermostat wiring.

This complete 24 volt thermostat wiring guide covers all thermostat wiring issues from the simple to the complex. The terminals on a two wire thermostat are labeled r and w. For shorter runs use 20 gauge. Basic electrical 101 08 hvac thermostat wiring and.

Honeywell programmable thermostat 2 wire install. We address them in order from most common to least common. Choosing the proper gauge. For simple heating applications a 2 conductor wire is sufficient.

If the unit requires only two wires the system is only able to heat the space.