![]() It is important to note in the systems that have two thermostats to make the occupants aware that with two thermostats it is possible to have both systems on and fighting each other in which they are going to use a lot of energy which means their bill will be high.īank of Step Down Transformers for a VAV/DDC Control SystemĢ transformer systems can be wired for a single transformer however this will require the skills of a good HVAC tech to design the new control circuit that will work properly for both systems and to make sure the new circuit does not exceed the VA rating on the transformer. I have observed both types where there is a single thermostat and where there are two thermostats. 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. The boiler system utilizes its very own control wiring and circuits while the air conditioner does the same and each separate system has its own transformer. It is not uncommon to find these combinations of HVAC systems with two transformers. There are some situations where a new air conditioner is installed where there is an existing boiler system. 2 Transformer Heating and Cooling Systems | How Can I Tell 1 or 2 Transformers for Heating Cooling System When sizing transformers for control circuits I always leave a little room and oversize the transformer a little taking into consideration the fact that in the future someone may add some things into the circuit and I want a little cushion there to ensure the transformer I am installing will handle the load. It is a simple act to add up the components and their VA rating and make sure the transformer is large enough to handle the load based on the VA rating. When an engineer specs a new system they select the proper transformer that will handle the load based on the number of components in the control circuit that the transformer will be required to power.Įach coil or component which is powered by the transformer will have a VA rating on it. The VA rating is important to understand because you should never exceed the VA rating on the transformer. ![]() One other additional note about using a single transformer in residential versus sometimes using multiple transformers in commercial units: Every transformer has a VA rating on it. Transformers VA Rating | How Can I Tell 1 or 2 Transformers for Heating Cooling System Related Link: Thermostat Wiring Color Codes for thermostat wiring - The more you know 1 or 2 Transformers for Heating Cooling System - NEC and other Code Considerations for Control Wiring So, How Can I Tell 1 or 2 Transformers for Heating/Cooling System? Read on for more explanations. In commercial systems, you can have several step-down transformers in a single unit that will break down the voltage from 277 volts all the way down to 24 volts and everything in between but in residential systems, there is usually only a need for one step down transformer to provide a control voltage for the entire system. How to tell if you have a Dual Transformer HVAC System. How Can I Tell 1 or 2 Transformers for Heating Cooling System? I get this question a lot and I also see this question used in my stats on how people find the site but I do not believe I have directly addressed or dedicated an article to this subject yet but there are residential HVAC systems out there that use 2 transformers and it befuddles some people.
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