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How Zone Control Technology Works

PostPosted: Tue Jun 29, 2010 2:40 pm
by Greg
Even though you may have a basement that is cooler or an upper level that is warmer, technology is available today that can help deliver the right amount of cooling and heating to the rooms where it is needed to improve your comfort, indoor air quality and improve your system’s efficiency. It is called zone controls.

This technology allows you to designate specific temperature zones in multiple areas in your home. Zoning also enhances airflow in individual zones allowing your system to more efficiently clean the air and exchange stale air. And, if used properly, a zoned system also has been shown to reduce energy use by 25 percent to 30 percent because it can deliver just the right amount of conditioned air to the areas of the home that need it.

Zoning a home is actually quite simple. If you have a central forced-air heating and cooling system in your home, it uses a system of ducts that move air throughout the rooms in your home. Usually, there is a main duct combined with a series of branch ducts, which carry air to different rooms. Installed within these branch ducts are dampers that act like a door that opens and closes to allow or prevent the flow of air depending on which zone is calling for conditioned air.

To do this, a programmable thermostat is installed on each level of the home. Thermostats should be placed at a central location in each zone, on an interior wall. Your contractor will look for a place where lamps, sunlight, or other artificial heat can affect the thermostat.

If you adjust the thermostat for that zone to make it warmer or cooler, a signal is sent to open a damper for that particular level and shut the dampers that control other zones, which don’t need additional cooling or heating.

This allows just the right amount of conditioned air to go to that zone that needs it. Programming your thermostats to specific temperature conditions for each zone, or having your contractor do this when the system is installed, lets the controls and dampers take care of everything.

Damper Types

The damper system works differently than just closing a vent on a floor or wall. When you shut the vent, the heated or cooled air still must travel the length of the duct to reach the outlet. When it is denied an exit, the air usually sits in the pipe and becomes room temperature.

A damper is usually installed at the mouth of a distribution duct and either permits or allows airflow at that point. This maintains the pressure in the duct and redistributes the airflow to the rest of the structure. HVAC zone control dampers range in sizes to fit your ducts and can be round or rectangular depending on your duct style. They also can be powered by electricity or by compressed air. They also are available in "normally open" or "normally closed," depending on their intended location.