Aprilaire 8346 User's Guide download pdf (Page 8)

APRILAIRE ZONED COMFORT CONTROL PRODUCT GUIDE

Designing An

Is As Easy As

Aprilaire Zone

HVAC SYSTEM

SIZING

WHEN ZONING

Designing a system to

incorporate zoning is

really no different than

designing a non-zoned

system. You still need to

size for peak demand

based upon a good

Manual ‘J’ calculation

and you still need to

understand how much

air is to be delivered to

each room, again based

upon Manual ‘J’.

Designing the Zone System

Refer to the Aprilaire

Zoned Comfort Control Design Guide (Form #5001) for complete and

detailed information regarding system design. Here are the basic 1-2-3 steps.

Selecting Zones

The first thing that is required after you have determined what type and size forced

air heating and cooling equipment you will be using is determining which rooms will

make up the various zones for your system. Considerations include:

a) Occupancy: group rooms based upon their common occupancy patterns (i.e.,

bedrooms together or living, dining and kitchen together).

b) Exposure/Construction: group rooms that have similar load patterns (i.e., first

floor versus second floor, south facing versus north facing).

c) Size: ideally, each zone should be approximately equal in size. Having smaller

zones could potentially increase velocity and air noise.

Some additional thoughts:

• The more open the floor plan, the less ability you will have to “contain” the temp-

eratures (air) within zones. Establish your customer’s expectations up front.

• More is not always better. In the case of zoning, there are significant tradeoffs

when determining zones. Some customers may believe that “more is better,”

which can create unequal, and in some cases, very small zones. Resist the

temptation of selling as many zones as possible since you may never realize the

additional profits due to persistent call-backs. Refer to ‘c’ above.

CONVENIENT DESIGN

TOOL AVAILABLE -

FORM #5018

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Aprilaire 8346 User's Guide Page 8

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