Old Furnace Thermostat Wiring

A large majority of homes today have an hvac system containing a furnace oil gas or electric and an a c unit. The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. Because they only have one function they are 2 wire thermostats usually consisting of a red wire for power and a white wire for heating.

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Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat.

Old furnace thermostat wiring. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. These run from the thermostat to the furnace and control the heat in a home. Upgrade from mercury to digital thermostat david jones. My paperback and e book.

This article explains just what wire at a room thermostat actually controls. Two wire thermostats typically have a red and a white wire. By the use of an adjustable set point the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home and to turn off the system when the desired temperature is achieved. Replace your old thermostat to remove unsightly discolored plastic housing or metal domed thermostats with sleeker more economical digital display thermostats.

Reliable a perfect example of a common old thermostat is the. We have a 19 year old condo with an old carrier mercury thermostat. This data can also be helpful if thermostat wires have become mixed up or improperly color coded by allowing you to trace wires back to their control connection point. The thermostat wiring on these systems can have very similar wiring properties.

How to wire a thermostat. You out when connecting the wiring on the new thermostat. To wire a thermostat you must first be aware of the type of system that you have in your home. To wire a thermostat of this kind basic electrical skills tools and safety techniques are required.

Heck now i m not calling anyone a dummy. Always turn off the power before starting work. We have both a natural gas furnace and an ac unit. How to replace an old home thermostat.

The main trouble is dealing with those different colored wires knowing which one does what and if that wasn t enough. There are only four wires going into the existing thermostat red green blue white. Thermostat wiring for dummies. Thermostat wire reference chart.

4 wire or 5 wire thermostat wiring problem question. A heat only thermostat is a home thermostat which can only heat the air temperature and not cool it down.