WattMaster Auto-Zone Plus, Design, Installation And Operation

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Section 1
Design Guide
Table of Contents
Conventions .....................................................................1
General Information.........................................................3
Description of System Components.................................................................................3
Design Considerations.....................................................6
Zone Diversity .................................................................................................................6
Cooling - Partial Load Conditions ...................................................................................6
Heating - Partial Load Conditions ...................................................................................8
Override Conditions.........................................................................................................8
Building Pressurization....................................................................................................8
Design Guide....................................................................9
Step #1 - Zoning ..............................................................................................................9
Step #2 - Sizing the Central Unit ...................................................................................11
Step #3 - Duct Design Considerations...........................................................................11
Step #4 - Room Air Motion/Diffuser Selection.............................................................12
Step #5 - Bypass Damper Sizing ...................................................................................13
Step #6 - Sizing the Zone Damper.................................................................................15
Round Dampers .............................................................................................................17
Rectangular Dampers.....................................................................................................17
Pressure Independent Zone Dampers ............................................................................18
Auxiliary Heat Control Options...................................... 19
Table of Figures
Figure 1-1:
Auto-Zone Plus System ..............................................................................2
Figure 1-2:
Control Zones Affected by the Outdoor Load..........................................10
Figure 1-3:
Locating the Static Pressure Sensor for Bypass Damper Control ............14
Figure 1-4:
Round Damper Dimensions.......................................................................16
Figure 1-5:
Rectangular Damper Dimensions ..............................................................16
Table 1-1:
Round Air Damper Selection .....................................................................17
Table 1-2:
Rectangular Damper Selection...................................................................17
Table 1-3:
Pressure Independent Flow Factors............................................................18
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