HZ432
Zoning System Design Manual
70-2321-03
Zoning Made Effortless
Zoning System Design Manual
M28112
FIRST FLOOR
(LIVING AREA)
ROOM TEMPERATURE
72°F
22°C
THERMOSTAT
SETPOINT:
72°F/22°C
TYPICAL HOME
SECOND FLOOR
(SLEEPING AREA)
ROOM TEMPERATURE
76-80°F
25-27°C
ZONE 2
(LIVING AREA)
ROOM TEMPERATURE
72°F
22°C
THERMOSTAT SETPOINT:
72°F/22°C
THERMOSTAT SETPOINT:
72°F/22°C
IDEAL HOME - WITH HONEYWELL ZONING
ZONE 1
(SLEEPING AREA)
ROOM TEMPERATURE
72°F
22°C
IntroductIon
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 comfortable. 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
rooms.
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.
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For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Zoning Hotline toll-free at 1-800-828-8367
Need Help?
Zoning System Design Manual
M28051
FAMILY
ROOM
LIVING
ROOM
ENTRY BEDROOM
1
BEDROOM
2
MASTER
SUITE
DINING
ROOM
KITCHEN
BATH
HVAC EQUIPMENTZONE THERMOSTAT
ROUND ZONE DAMPER
DIFFUSER
BATH
IntroductIon
Fig. 2 depicts a typical residential layout with three zones. Zoning provides two key benefits:
• Customer Comfort: heating and cooling where you want it, when you want it.
• Energy Savings: heat and cool only zones that are occupied.
In the following pages you will learn how to apply the principles of forced air zoning in new and existing projects,
creating a more comfortable indoor environment.
Fig. 2. Typical residential layout with multiple zones on one HVAC system.
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Zoning System Design Manual
M28111
Plan the Zones
In planning a zone system, here's what you need:
Panel
• To Operate Dampers and
Equipment
• Transformer to power panel
Dampers
• Round/Rectangular
Divide the Home Into Zones
1
There are a number of ways to divide a house into zones: by floor, in groups of rooms adjacent to each
other, rooms grouped by compass orientation—here is a typical setup:
Zone 1: areas primarily used at night (bedrooms)
Zone 2: areas primarily used during the day (living room, kitchen)
Zone 3: a third space that would benefit from its own HVAC control, such as a master bedroom suite,
a basement, living space above a garage, a home office, etc.
A good rule of thumb is to make no zone smaller than about 25% of total system capacity, measured in
cubic feet/minute (CFM).
Thermostats
• Programmable or
Non Programmable
Bypass and Discharge Air
Temperature Sensor:
• To Prevent Static Pressure
Buildup
• DATS protects Equipment
Zone 2: Night-time
Zone 2: Night-time
Zone 1: Daytime
Zone 1: Daytime
Fig. 3. Typical residential layout with multiple zones on one HVAC system.
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Zone 2: Night-time
Zone 2: Night-time
Zone 1: Daytime
Zone 1: Daytime
Zone 3:
Zone 3:
Home
Home
office
office
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