WattMaster Auto-Zone Plus - Figure 1-2: Control Zones Affected by the Outdoor Load

Section 1 Auto-Zone Plus
1-10 Design Guide
It is important to recognize that there are purely internal zones, such as Zone 10, which
may contain separate offices/conference/computer rooms. These internal zones could
easily have high cooling requirements while external zones (1,2,3, etc.) could be at or
near design heating load. This is a misapplication of the Auto-Zone Plus (or any
heating/cooling changeover) system. The interior zones with cooling only loads should
be served with a separate air-conditioning unit (that could be zoned between multiple
rooms with a similar load profile). Supplemental heat could be added to the perimeter
zones and controlled with the auxiliary heat control board from the Zone Controller.
System performance will generally be compromised and frequent changeover from the
heating to the cooling mode will occur during the heating season if purely internal zones
are combined on the same air-conditioning unit serving perimeter zones.
Figure 1-2: Control Zones Affected by the Outdoor Load
N
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Room Sensor
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Supply Air Duct
Supply Air Duct
Return Air Plenum
Return Air Plenum
Round Zone Damper
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Constant Volume HVAC Unit
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