What is a dual transformer system?

If you have a boiler as well as an air conditioner, you have a dual transformer system. With dual transformer setups, you will have two R wires—one from the cooling transformer (RC) and one from the heating transformer (RH).

Dual transformer means that there is a separate R for heat and cool (Rh and Rc). Nest E only has a single R connector while the regular Nest has two. Depending on what the system is the two can be combined or install a relay.

Secondly, what does RH and RC mean on a thermostat? Rh stands for Red-Heat and Rc stands for Red-Cool. If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat. Yellow/Y is the AC compressor. White/W is the Heating element.

Also know, what is a 2 transformer heating system?

2 Transformer Heating and Cooling Systems In that case, each system can have its own thermostat or if a single thermostat is used for both systems there must be RC and RH terminations in the thermostat to keep the two control/transformers circuit(s) apart.

How do I wire a two transformer thermostat?

The reason why most thermostats have a Rh and Rc is for systems with two transformers. The furnace transformer red wire goes to Rh, and the cooling (A/C) transformer red wire goes to Rc. In a home with one transformer, there is a jumper wire to connect Rc and Rh.

Why is there a jumper between R and RC?

Effectively there isn’t a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat.

Should RC and RH be connected?

R, Rh, Rc. In some systems, both the heating and cooling systems use their own signal voltage. In these cases, the signal wire from the heating system will be connected to R or Rh , while the signal wire from the cooling system will be connected to Rc .

What does a transformer do in HVAC?

Role Of HVAC Transformers Transformers are used when the incoming electricity voltage needs to be either raised or lowered to meet the requirements of the other electrical components or parts. The work of a transformer is to change the voltage that travels from the circuit board to the HVAC unit.

What is a RH wire?

Rh. If you don’t have an Rc wire, the Rh wire is the power wire for both your. heating and cooling systems. If you have an Rh and an Rc wire, the Rh wire is the power wire for your. heating system.

How do you wire a 24 volt transformer?

How to Wire a 24V Transformer Inspect the wires connected to the 24 VAC transformer. Remove all electrical power to the device the transformer is being installed for. Mount the transformer to a firm surface using the provided screws or enclosure. Strip 3/4 inch of the outer insulation from the transformer’s four wires with your wire strippers.

How does a 24 volt transformer work?

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.

Does Home Depot sell transformers?

Transformers – The Home Depot.

Will nest do dual fuel?

The Nest thermostat is compatible with these systems and supports up to 2 alternate heat sources. WARNING: Choosing incorrect options for a dual fuel system can result in damage to your system. If you have a dual fuel system, you will need to have a trained professional set up your thermostat.

Where is the transformer on an air conditioner?

The transformer, located inside of the house on the furnace or fan coil unit for the air-conditioning, is a small black or brown electrical component that is normally located on the inside of the furnace or mounted just outside the furnace.