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:
• Provide the rough dimensions of each area or room.
• Indicate the location and relative size of doors, windows, and
skylights. In particular, identify any large glass areas (exceed-
ing 30 percent of the wall area).
• Indicate any equipment that may add a sensible/latent load
(Light Commercial: computers, copiers, and waiting rooms.
Residential: hot tubs, etc.).
• Indicate whether any trees or buildings cast shade on any of the
building’s exposures.
• Indicate the orientation of the home/building so you can
determine whether there are any rooms or areas facing south or
west where solar heat load may be a factor when making zone
assignments.
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
airflow.
• Set mechanical minimum damper positions in some zones.
• Improve the home/building’s insulation to reduce the demand
for heating and cooling (load) so that lower capacity equipment
can be used effectively in the installation.
Fig. 1–Zone Perfect Plus 8 Zone Kit
A99247
8 Zone Kit
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