Furnace Thermostat Transformer

If you are having trouble with your transformer you may have to deal with the internal wires of these two systems.

Furnace thermostat transformer.

The transformer steps down 120 volts to the 24 volts the thermostat needs and sends out the 24 volts on two wires. If not you may need to replace the furnace transformer which requires some basic rewiring and a general awareness of electrical work. Or you can locate the low voltage transformer that powers the thermostat. Energy limiting meets nema standard.

Low voltage thermostats are powered by a transformer that reduces the incoming line voltage from 120 volts down to a level between 12 and 24 volts depending on your furnace design. The transformer is usually located near the heating and air conditioning system or inside of a furnace access panel. Lead wires for primary connections. This honeywell nema standard transformer is a multi mounting.

On the other hand the display and the controls on some thermostats are not powered by batteries. 24 volt control circuit step down transformer designed to power any 24 volt control system including thermostats gas valves and relays. The thermostat tells the system when to turn on and shuts it off when the house temperature has reached the desired level. If your connections do not match consult the installation diagram in the new thermostat s owner s manual.

Within this low voltage thermostat category there are four major types. This transformer is located inside your hvac equipment. The first system is for the supply voltage and the other is for the secondary voltage. The furnace transformer is comprised of two systems that make up the furnace transformer wiring.

If you are noticing bad furnace transformer symptoms such as regular blowouts run through a basic testing procedure to ensure your 24 volt. The two 24 volt wires can never touch or the transformer. In fact many thermostats are powered by the 24 volts from the transformer. Furnace 24 volt transformer r is the hot side while c is the common side of the transformer.

These thermostats are called low voltage because they run off a transformer that reduces line voltage from 120 volts to a level somewhere between 12 and 24 volts depending on the brand of furnace you have. The two 24 volt wires go to the r terminal and c terminal inside the thermostat. 1 year limited warranty. A 24 volt transformer is typically used as a control device to turn a higher voltage generally 120 vac into a lower working voltage for switches or relays such as in a furnace thermostat transformer.