Honeywell Hz311 Hz322 Hz432 Users Manual 70 2321 03 Zoning System Design

2014-12-11

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Zoning System Design Manual

Zoning Made Effortless

70-2321-03

Zoning System Design Manual

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 supply 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.

TYPICAL HOME

IDEAL HOME - WITH HONEYWELL ZONING

SECOND FLOOR
(SLEEPING AREA)
ROOM TEMPERATURE
76-80°F
25-27°C

FIRST FLOOR
(LIVING AREA)
ROOM TEMPERATURE
72°F
22°C

ZONE 1
(SLEEPING AREA)
ROOM TEMPERATURE
72°F
22°C

ZONE 2
(LIVING AREA)
ROOM TEMPERATURE
72°F
22°C

THERMOSTAT
SETPOINT:
72°F/22°C

THERMOSTAT SETPOINT:
72°F/22°C

M28112

Fig. 1. Typical home (no zoning) compared to ideal home with Honeywell zoning.

Need Help?
For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Zoning Hotline toll-free at 1-800-828-8367

70-2321—03

Zoning System Design Manual

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.

FAMILY

LIVING

ROOM

KITCHEN

ENTRY

BEDROOM

DINING

MASTER

ROOM

ZONE THERMOSTAT

BEDROOM

BATH

HVAC EQUIPMENT

BATH

SUITE

M28051

ROUND ZONE DAMPER
DIFFUSER

Fig. 2. Typical residential layout with multiple zones on one HVAC system.

70-2321—03

Zoning System Design Manual

Plan The Zones
In planning a zone system, here's what you need:
Panel

Thermostats

• To Operate Dampers and
Equipment

• Programmable or
Non Programmable

• Transformer to power panel

Dampers
• Round/Rectangular

Bypass and Discharge Air
Temperature Sensor:
• To Prevent Static Pressure
Buildup
• DATS protects Equipment

Divide the Home Into Zones
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).

Zone 2: Night-time

Zone 1: Daytime

Zone 3:
Home
office

M28111

Fig. 3. Typical residential layout with multiple zones on one HVAC system.

70-2321—03

Zoning System Design Manual

Ducts and Dampers

Size the Ductwork
In New Construction: ductwork is sized as usual for the size of the home; trunks are sized for the
amount of air going to the zone.
Ductwork should be designed normally, typically .10 or .08 in. w.c./100 ft.
Proper duct design of a zoned system will:
• Maintain proper airflow through the HVAC unit when only one zone is open.
• And maintain proper airflow to all zones when all are open.
In Retrofit Applications: zones are somewhat limited by how the ducts were originally constructed,
but any home can be zoned provided there is access to the ductwork. See page 10 for zoning information specific to retrofit applications.

Select Dampers
Use ZD dampers for rectangular ducts. Use ARD or
RRD dampers for round ducts in residential systems up
to 2000 CFM.
For systems over 2000 CFM or commercial systems,
see page 11.
Install the Dampers
A supply air damper should not be placed closer than 6
ft. to a diffuser. The damper should also be at least 3 ft.
away from the plenum. (Less than 6 ft. between damper
and diffuser could create objectionable air noise in the
conditioned space and 3 ft. of duct off the plenum will
reduce turbulence.) These minimums are recommendations for optimal performance; however, each installation presents its own challenges, so each installation will vary. For instance, in some installations the
damper may need to be mounted directly on the plenum.
Allow for Access
Dampers should be installed in a location that can be accessed for service. If a damper needs to be
"buried," place a decorative register over it to provide access.
Balancing Dampers
Balancing dampers should be included in the duct work, because a zoned home needs to be balanced
just as a non-zoned home does.

70-2321—03

Zoning System Design Manual

Bypass Dampers and DATS
Size the Bypass Damper

Install between supply and return.
All zoning systems should be installed with a supply-to-return bypass damper. A Static Pressure
Regulating Damper (SPRD) is used to bypass excess airflow from the supply duct into the return duct.

Table 1. SPRD Dimensions.
Supply duct systems should be sized to handle
the total airflow when all zones are open, and use
a SPRD bypass capable of handling the excess air
when only the smallest zone is calling. Excess air
should be bypassed into the return air duct. If the
space is too confined to install a bypass back to the
return, excess air can also be dumped into a hallway, false ceiling, or basement.
Determine the size of the bypass as follows:
CFM System
- CFM Smallest Zone
= CFM Bypass

Round SPRD

Rectangular SPRD

Model Number By-Pass

SPRD7

300 CFM

SPRD12X8

1000 CFM

SPRD8

400 CFM

SPRD12X10

1200 CFM

SPRD9

600 CFM

SPRD12X12

1400 CFM

SPRD10

750 CFM

SPRD20X8

1600 CFM

SPRD12

1200 CFM SPRD20X10

2000 CFM

SPRD14

1800 CFM SPRD20X12

3000 CFM

SPRD16

2400 CFM

For example, on a 4-ton system............................... 1600 CFM System
with the smallest zone designed to handle............. - 400 CFM Smallest Zone
the by-pass must be able to handle......................... = 1200 CFM of airflow in bypass
When few zones are calling, static pressure in the system increases, and air is bypassed from supply to return.
This ensures that the throw of air at the register is correct whether one zone is calling or all zones are calling.
This method of duct design is also a great way to control excess humidity in the home, especially in southern
climates. Bypassing air from the supply duct into the return duct accelerates the dehumidification ability of the
equipment, creating greater comfort for the homeowner.

70-2321—03

Zoning System Design Manual

Bypass Dampers and DATS
Alternative Bypass Methods
If there is no space for bypass ductwork, the zone dampers can be set to allow some air to leak. By setting the
larger zone dampers to a minimum position, excess air pressure can be relieved even when only one zone is calling. This method does not typically affect room temperature, but the homeowner should be advised that air will be
coming from these registers even when that zone is not calling.
Discharge Air Temperature Sensor (DATS)
The DATS should be located in the supply trunk between the evaporator coil or heat exchanger and the first zone
damper. If this is not possible, it is permissible to mount the DATS in the bypass duct.

HORIZONTAL

THE DATS MUST BE LOCATED SO THAT
IT CAN PROPERLY SENSE THE LEAVING
AIR TEMPERATURE.

ROOF TOP EQUIPMENT

NOTE: MOUNTING THE DATS TOO CLOSE
TO THE HEAT EXCHANGER OR EVAPORATOR
COIL WILL CAUSE EXCESSIVE CYCLING OF
THE SYSTEM AND RESULT IN DISCOMFORT
FOR THE BUILDING OCCUPANTS.

UP FLOW

DISCHARGE AIR
TEMPERATURE SENSOR (DATS)
M28055

Fig. 4. DATS mounting locations.

70-2321—03

Zoning System Design Manual

Zone panel
Install the Panel

Mount on return, stud, wall, or roof truss.
Zone Panels should not be exposed to weather or installed in a location where they might get wet. Like
a damper, they must be accessible for service, if required. Select a conventional zone control panel or
communicating zone panel using Table 2 and 3. Notice that no fossil fuel kit is necessary for the HZ432
in dual fuel applications, but is necessary for all other panels.

Table 2. Conventional Zone Panel Selection Guide.
CONVENTIONAL ZONE PANEL SELECTION GUIDE
CONVENTIONAL

CONVENTIONAL
2-HEAT/2-COOL

2-HEAT/1-COOL

3-HEAT/2-COOL OR
DUAL FUEL 2 HEAT/2-COOL

2 TO 32 ZONES

HZ432

HZ322

HZ322 OR HZ311

HZ432 OR HZ322

2 TO 3 ZONE

WIRELESS ZONING
WITH
T8665A WIRELESS
THERMOSTAT

1-HEAT/1-COOL

HZ322
HZ311

with W8665E

HEAT PUMP

HEAT PUMP/
CONVENTIONAL

APPLICATION

with W8665E

HZ432

with W8665E
M19800B

NETWORKED
ZONING SELECTION
GUIDESelection Guide.
Table 3. Networked
(Communicating)
Zoning

CONVENTIONAL/
HEAT PUMP

OPERATES SINGLE STAGE,
MULTISTAGE, AND
HEAT PUMP EQUIPMENT
UP TO 3-HEAT/2-COOL

APPLICATION

THERMOSTAT

TH9421C1004
or
TH5320C1002

EQUIPMENT INTERFACE
MODULE

W8835A1004

DAMPER INTERFACE
MODULE
UP TO 9 ZONES TOTAL

NOT NEEDED
FOR ZONES 1-3
ONE W8703A FOR EVERY
3 ZONES FROM 4-9

DISCHARGE AIR
TEMPERATURE SENSOR
DATS

C7835A1009

TELEPHONE
ACCESS MODULE

W8635D
M19801A

70-2321—03

Zoning System Design Manual

Zone panel
The zone panel is typically installed near the indoor unit, in a garage, crawl space, basement, or attic. Zone panels
are often installed on the return air duct. However, in some heat pump applications, the homeowner or building
occupant may require access to the panel to change
SPRD BYPASS DAMPER
ZD SERIES
into the emergency heat mode. To meet these needs,
ZONE DAMPERS
install the panel in a utility closet or other convenient
area where the panel is easily accessed.
SUPPLY DUCT
DATS
(ALTERNATE LOCATION)

TrueZONE PANEL MOUNTED
ON RETURN DUCT
ZONE PANEL
(WALL MOUNT)

TrueZONE PANEL
MOUNTED ON WALL

BYPASS
DAMPER
DATS
(ALTERNATE LOCATION)

RETURN
DUCT

DATS (AT LEAST 3 FT
FROM PLENUM)

ZONE PANEL
(DUCT MOUNT)

M24921

FURNACE OR AIR CONDITIONER

Fig. 5. Typical upflow HVAC system.

ARD
DAMPERS

DATS

Fig. 6. Typical horizontal
HVAC system.

Thermostats
Install thermostats using instructions
provided with thermostat. Wireless
thermostats can be used to speed
installation.

SUPPLY
DUCT
M28164

Transformer
Mount and wire a dedicated transformer to the zone panel. The AT140A1042 is rated to 130°F (54°C). If it is to be
mounted in an attic that may get much hotter, install the AT175A1008, which is rated to provide 50 VA at 165°F (74°C).
Connect power to the zone control panel after all other wires are attached.
Variable Speed Fan
A variable speed fan or ECM blower changes blower speed to deliver a constant CFM regardless of static pressure.
To use zoning with a variable speed fan, plan and install zoning normally, and use an SPRD or a MARD (round)
damper with static pressure control (SPC) for bypass.
HVAC
24 VOLT TRANS.

FAN RELAY

BK
Y2
Y

EQUIPMENT

W
W2

RH
RC
W1/E
W2
W3
Y1
Y2
G
O
B
DS/BK

M28169

COMPRESSOR
RELAY

Fig. 7. Wiring variable speed
fan to TrueZONE panel.

If using a Honeywell TrueZONE panel, the panel's
DS/BK terminal is intended for use with a variable-speed fan. When one zone is calling (or less
than 25% of capacity on systems with more than 4
zones), this terminal will be de-energized of 24 VAC.
This reduces blower speed on most variable speed
blowers.

70-2321—03

Zoning System Design Manual

Retrofit Applications
For retrofit applications, first you have to ensure that the duct system is adequate for room/zone loads, and that
the existing HVAC system is properly sized to deliver heat/cool. After that, planning the zone system is very similar
to new construction.

Rigid Duct, Rectangular Sheet Metal Duct, Knockdown (KD) Duct
Using a retrofit round damper (RRD) significantly reduces
labor—it installs in a fraction of the time—and overall system
installation cost. A retrofit damper slides into rigid round pipe
for quick installation.
Honeywell offers dampers for rigid round duct in 5-, 6-, 7-, and
8-in. diameters. Multiple RRD dampers may be wired in parallel.

M28119

Fig. 8. Installing retrofit round damper.

Flex Duct
For retrofit applications in flex duct, use round ARD dampers. The round ARD is a galvanized steel single blade
damper with a low-leakage gasket, and comes in a range of sizes from 5–20 in. You can use multiple ARDs on any
duct—just wire them in parallel.
Thermostats
The existing thermostat can often be used for one zone, but as it might be difficult to run wires to the other zones,
Honeywell wireless thermostats can be used.

70-2321—03

Zoning System Design Manual

Commercial zoning
Zoning for commercial buildings makes just as much sense as zoning for residential buildings: in a large office
building, each office suite could have its own zone, giving each occupant the ability to set the heat/cool to his or
her comfort.
Zone Design
While a typical residential building might have a system of 5 tons or less, commercial buildings typically have
much larger (up to 20 ton) HVAC units. A commercial zoning system will likely have more zones, and the ducts
might be bigger, but the basic principles of design and the devices used to implement zoning remain the same.
Bypass Damper
The bypass damper must be a motorized damper such as the MARD, controlled by a static pressure control.
Another option is a Honeywell D2 or D3 rectangular damper operated by an ML6161B2024 actuator and mounted
with a 32007205-001 bracket. The MARD or D2/D3 damper is then wired to a static pressure control (SPC) to
modulate the bypass air.
Zone Damper
Zone dampers must be able to handle the higher airflow and static pressure of a larger HVAC system. Use a
MARD or RRD for round ducts; for rectangular ducts, use a commercial rectangular damper such as a Honeywell
D2 or D3 with the same motor and bracket listed above.

70-2321—03

Automation and Control Solutions
Honeywell International Inc.

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Toronto, Ontario M1V 4Z9

Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.

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