Zoning System Design Manual
The Concept of Zoning
The basic principle of forced air zoning is to allow one HVAC system to be controlled by multiple thermostats,
heating and cooling a building in zones rather than as a whole. This makes homes and businesses more comfort-
able. When combined with setback thermostats, zone setback is possible, resulting in significant energy savings.
Forced air zoning makes a common HVAC system more efficient by concentrating the unit's capacity where and
when you need it instead of pouring air throughout the building regardless of the temperature in the individual
According to a 2006 American Home Comfort Study, 67% of US homeowners are uncomfortable in their homes at
certain times of the year. Zoning solves this problem.
To accomplish this we utilize:
Zoning Panel—Receives requests from thermostats and coordinates the HVAC system and damper positions.
Thermostats—Requests conditioned air only in zones where required.
Duct Dampers—Directs air to rooms (zones) only when called for by a room thermostat.
A By-Pass Damper—Efficiently controls excess supply air as dampers open and close.
Discharge Air Temperature Sensor (DATS)—Avoids freeze-up and tripping on high limit by sensing the sup-
ply duct temperature. The zone panel cycles off the equipment when DATS limits are exceeded. The equipment is
turned back on automatically.
Fig. 1 depicts typical home temperatures compared to those of a home with Honeywell zoning.
Fig. 1. Typical home (no zoning) compared to ideal home with Honeywell zoning.
For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Zoning Hotline toll-free at 1-800-828-8367
IDEAL HOME - WITH HONEYWELL ZONING