Assigning Zones - Bryant ZONE PERFECT PLUS Zoning Design Manual

Sizing the equipment
Task 3–Calculate block load estimates and zone load estimates.
Task 4–Size the heating and cooling equipment.
Sizing the duct system
Task 5–Determine bypass needs/options.
Task 6–Explanation of the Duct Sizing Worksheet.
I. ASSIGNING ZONES
A. Task 1–Assess the goals for comfort and energy
savings
For a zoning system to be successful, it must meet the customer's
goals for comfort and/or energy savings. Therefore, it is essential
to understand the goals before beginning to design the system. In
some situations, a customer's expectations might not be realistic
and it would be impossible to design a system to meet those
expectations. By identifying this problem from the start, you can
help revise these expectations and avoid creating a dissatisfied
customer.
In addition to understanding the general goals for the zoning
system, you need to understand exactly how each space/zone will
be used. Use Owner Survey sheet provided. The appendix will
help you gather information from the owner/customer.
B. Task 2–Conduct a site survey and make preliminary
zone assignments
The purpose of conducting a site survey is to gather the informa-
tion that you need to make zone assignments. Use the Floor Pan
Worksheet provided in the Appendix. Follow these guidelines:
8 Zone Kit
Fig. 1–Zone Perfect Plus 8 Zone Kit
• Provide the rough dimensions of each area or room.
• Indicate the location and relative size of doors, windows, and
• Indicate any equipment that may add a sensible/latent load
• Indicate whether any trees or buildings cast shade on any of the
• Indicate the orientation of the home/building so you can
Considerations for a Retrofitting Installation
It is a far greater challenge to design a retrofitted zoning system
than it is to design a system for a new home or office. For a zoning
system to operate properly in a retrofitted installation, it usually is
necessary to use one or more of the following approaches to
compensate for an air distribution system that is too small for the
zoning system:
• Modify the existing ductwork and dampers to handle additional
• Set mechanical minimum damper positions in some zones.
• Improve the home/building's insulation to reduce the demand
—2—
skylights. In particular, identify any large glass areas (exceed-
ing 30 percent of the wall area).
(Light Commercial: computers, copiers, and waiting rooms.
Residential: hot tubs, etc.).
building's exposures.
determine whether there are any rooms or areas facing south or
west where solar heat load may be a factor when making zone
assignments.
airflow.
for heating and cooling (load) so that lower capacity equipment
can be used effectively in the installation.
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