Honeywell TrueZONE HZ311 Manuale utente

Zoning System Design Manual

Zoning Made Effortless

70-2321-03

Zoning System Design Manual

70-2321—03 2

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 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

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.

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

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

Zoning System Design Manual

3 70-2321—03

M28051

FAMILY

ROOM

LIVING

ROOM

ENTRY BEDROOM

BEDROOM

MASTER

SUITE

DINING

ROOM

KITCHEN

BATH

HVAC EQUIPMENTZONE THERMOSTAT

ROUND ZONE DAMPER

DIFFUSER

BATH

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

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.

IntroductIon

Zoning System Design Manual

70-2321—03 4

Plan the Zones

Panel

• To Operate Dampers and

Equipment

• Transformer to power panel

Thermostats

• Programmable or

Non Programmable

Dampers

• Round/Rectangular

Bypass and Discharge Air

Temperature Sensor:

• To Prevent Static Pressure

Buildup

• DATS protects Equipment

In planning a zone system, here's what you need:

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).

M28111

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

Zone 1: Daytime

Zone 2: Night-time

Zone 1: Daytime

Zone 2: Night-time

Zone 3:

Home

office

Zone 3:

Home

office

Zoning System Design Manual

5 70-2321—03

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 informa-

tion 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 recommenda-

tions for optimal performance; however, each installa-

tion 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.

Zoning System Design Manual

70-2321—03 6

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.

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 hall-

way, false ceiling, or basement.

Determine the size of the bypass as follows:

CFM System

- CFM Smallest Zone

= CFM Bypass

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.

Table 1. SPRD Dimensions.

Round SPRD Rectangular SPRD

Model Number By-Pass 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

ByPass damPers and dats

Zoning System Design Manual

7 70-2321—03

ROOF TOP EQUIPMENT

DISCHARGE AIR

TEMPERATURE SENSOR (DATS)

THE DATS MUST BE LOCATED SO THAT

IT CAN PROPERLY SENSE THE LEAVING

AIR TEMPERATURE.

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.

M28055

UP FLOW

HORIZONTAL

Fig. 4. DATS mounting locations.

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 call-

ing. 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.

Zoning System Design Manual

70-2321—03 8

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.

Zone Panel

APPLICATION

2 TO 3 ZONE

2 TO 32 ZONES

CONVENTIONAL

1-HEAT/1-COOL

HZ322

HZ311

HZ432

CONVENTIONAL

2-HEAT/2-COOL

CONVENTIONAL ZONE PANEL SELECTION GUIDE

HZ322

HZ432

HEAT PUMP

2-HEAT/1-COOL

HZ322

HZ432 HZ432

HEAT PUMP/

CONVENTIONAL

3-HEAT/2-COOL OR

DUAL FUEL 2 HEAT/2-COOL

HZ432

with W8665E

WIRELESS ZONING

WITH

T8665A WIRELESS

THERMOSTAT

HZ322 OR HZ311

with W8665E

HZ432 OR HZ322

with W8665E

HZ432 OR HZ322

with W8665E

M19800B

APPLICATION

NETWORKED ZONING SELECTION GUIDE

M19801A

THERMOSTAT

CONVENTIONAL/

HEAT PUMP

OPERATES SINGLE STAGE,

MULTISTAGE, AND

HEAT PUMP EQUIPMENT

UP TO 3-HEAT/2-COOL

EQUIPMENT INTERFACE

MODULE

TH9421C1004

TH5320C1002

DAMPER INTERFACE

MODULE

UP TO 9 ZONES TOTAL

W8635D

C7835A1009

W8835A1004

DISCHARGE AIR

TEMPERATURE SENSOR

DATS

NOT NEEDED

FOR ZONES 1-3

ONE W8703A FOR EVERY

3 ZONES FROM 4-9

TELEPHONE

ACCESS MODULE

Table 2. Conventional Zone Panel Selection Guide.

Table 3. Networked (Communicating) Zoning Selection Guide.

Zoning System Design Manual

9 70-2321—03

W1/E

DS/BK

M28169

HVAC

FAN RELAY

24 VOLT TRANS.

COMPRESSOR

RELAY

EQUIPMENT

If using a Honeywell TrueZONE panel, the panel's

DS/BK terminal is intended for use with a vari-

able-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.

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.

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

into the emergency heat mode. To meet these needs,

install the panel in a utility closet or other convenient

area where the panel is easily accessed.

SUPPLY DUCT

DATS (AT LEAST 3 FT

FROM PLENUM)

DATS

(ALTERNATE LOCATION)

TrueZONE PANEL MOUNTED

ON RETURN DUCT

TrueZONE PANEL

MOUNTED ON WALL

ZD SERIES

ZONE DAMPERS

SPRD BYPASS DAMPER

FURNACE OR AIR CONDITIONER

M24921

Fig. 5. Typical upflow HVAC system.

Fig. 6. Typical horizontal

HVAC system.

Fig. 7. Wiring variable speed

fan to TrueZONE panel.

Zone Panel

DATS

M28164

SUPPLY

DUCT

RETURN

DUCT

BYPASS

DAMPER

ZONE PANEL

(DUCT MOUNT)

ZONE PANEL

(WALL MOUNT)

ARD

DAMPERS

DATS

(ALTERNATE LOCATION)

Thermostats

Install thermostats using instructions

provided with thermostat. Wireless

thermostats can be used to speed

installation.

Zoning System Design Manual

70-2321—03 10

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.

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.

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.

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