Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 21)

Auto-Zone Plus Section 1
Design Guide 1-17
The best approach would be to serve the interior zones with cooling only loads with a
separate constant volume HVAC unit (that could be zoned if desired between multiple
rooms with a similar load profile) instead of zoned with perimeter zones. Also perimeter
zones with South and West exposures typically have a higher cooling load than North and
East exposures. It is best to group the South and West perimeter zones together on the
same HVAC unit and the North and East perimeter zone together on another HVAC unit.
This will provide the best energy savings, prevent the HVAC units from changing over
from heating to cooling frequently and provide the best comfort for the occupants. This
recommended ideal system is depicted in Figure 1-4. If you use this approach you will
have the best flexibility and energy saving system design that is
possible.
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Figure 1-4:
Correct Zoning of Typical Building