What are twinned units?
Twin units can be two airconditioner condensers and/or two furnaces. Most manufacturers make a twinning kit that will wire two units together to operate simultaneously by one thermostat. At times, one may operate as a first stage of heating (cooling) and then the other unit can operate as second stage. Twinning unit are beneficial in commercial buildings where the load conditions vary constantly. For instance, if you twin two 4 ton units together. On a nice cool day, you may only need 4 tons of air conditioning. So, the thermostat will only turn on one unit. On a hotter day, you may need 8 tons of air, so the thermostat will turn on both units. In case you are thinking about doing this, the biggest mistake in twinning units together is using a common return air for the furnaces. Make sure you separate the return air cavities and ductwork for both of your furnaces If you don't have separate returns, you have the possibility of one of the blowers starting backwards. (talking form experience LOL)
Aug 13, 2011 |