Page 8 - Zone Control Product Guide

8
A P R I L A I R E Z ON E D COMF ORT CON T RO L P RODUC T GU I D E
Designing An
Is As Easy As
Aprilaire Zone System
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:
Occupancy:
group rooms based upon their common occupancy patterns (i.e.,
bedrooms together or living, dining and kitchen together).
Exposure/Construction:
group rooms that have similar load patterns (i.e., first
floor versus second floor, south facing versus north facing).
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 ‘size’ above.
CONVENIENT DESIGN
TOOL AVAILABLE -
FORM #5018