Single Stage Furnace Thermostat Wiring

The e and w2 hook ups are for the emergency heat relay and auxiliary heat control respectively.

Single stage furnace thermostat wiring.

Single stage hvac system thermostat source. So that s the easiest way to identify single stage conventional hvac systems which would be furnace based or boiler based. The thermostat you purchased is designed for a single stage system such as an air conditioner and a single stage gas furnace. That is a basic honeywell thermostat wiring diagram for a single stage heat pump.

Verify that the red wire is connected to the r terminal green wire to the g terminal and white wire to the w terminal. The first and foremost thing you must do is to check what kind of heating system you are using at your home. So you may have to fish an additional four strand cable from the furnace room to the thermostat location photo 1. A dual fuel system which is comprised of a gas furnace and a heat pump should be connected to a thermostat or control system that can accommodate the specific heating set points.

A two stage thermostat may need more wires than your current programmable thermostat. 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. Conventional single stage systems will have one wire leading into w or w1 terminal for heating and one wire leading into y or y1 terminal for cooling. A two stage or variable speed system may only be operating at a single speed because the thermostat or control system doesn t allow for two stage wiring.

Strip the brown thermostat wire back one half inch and connect it to the w2 terminal on the furnace. If not connect them in this manner. Furthermore this thermostat wiring diagram is specifically for a system with two transformers your system likely only has one transformer as most typical residential systems only use a single transformer for control. One which is common is the single stage heating system and the other one is multi stage heating system.

Basically heating furnaces are of two types. The terminals are usually marked r and w. How to choose the right furnace thermostat. 1 know your heating system.

If you have a two stage heat pump then you will also utilize terminal y2 for the second stage. The thermostat only kicks in the second stage if the furnace can t maintain 6 to 8 degrees per hour.