V. REFERENCE FOR DUCT SIZING WORKSHEET: (SEE
STEP 7 AT DUCT SIZING WORKSHEET, PAGE 9)
Using Table 2A locate the Minimum Main Duct Area from Step
6 (duct sizing worksheet) to determine the Main Duct size. Select
a damper/duct size at least as large as the area required. Refer to
the Product Data for sizes of dampers. If the Main Duct is split or
runs in two directions, divide up the total zone CFM needed to
each main, locate the square inch areas to meet the required CFM
and then size the dampers.
Using Table 2B locate the Minimum Branch Area from Step 6 to
determine the Branch Duct size(s). Any combination can be used,
as long as the total of the Branch Duct area meets or exceeds the
required amount.
APPENDIX
The following appendix provides worksheets for you to copy and
use when designing a Zone Perfect Plus installation:
• Owner Survey
• Floor Plan Worksheet
• Duct Sizing Worksheet
• Examples
We will show three examples of the zoning design guide.
Example 1
Light Commercial — Doctor’s Office
Heating Load: 125,000 Btu
Cooling Load: 115,000 Btu
Equipment selected: 581B120125
Example 2
Residential Ranch
Heating Load: 90,000 Btu
Cooling Load: 52,000 Btu
Equipment Selected: 355MAV060100 and 598B060
Example 3
Taking Example 2 and substitute Duct-Board as main and Flex-
Pipe as branch runs. We will begin at Step 6.
Fig. 3–Dump Zone Installation
A00191
BAROMETRIC
BYPASS
SUPPLY AIR DUCT
LEAVING AIR
TEMPERATURE
SENSOR
RETURN AIR
DUCT
RETURN AIR
INDOOR UNIT
—5—
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