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The Braeburn Zoning Reference Guide 10 Part No. RG-0508-001
All Priority• allows the existing call to continue for 15 or 20 minutes, and then starts
to switch over even if the rst call is not done. The switchover starts with a purge,
where the heating or cooling equipment is shut off, while the fan continues to
run with the dampers left just like they were. With the equipment off, and the
fan running, the conditioned air is “purged’ from the system until the air is nearly
room temperature. At that time, the zone controller switches on the equipment
for the opposite mode, and opens the dampers for the opposite calling zone, and
closes the original calling zone dampers. The switchover is now complete.
The system will continue in this state until either the call is satis ed, or if the opposite mode
calls, in which case, the entire purge/changeover cycle will start over again. This normal
operating mode for the zone panel will continue until all thermostats no longer call for heating
or cooling.
Using the Zone Panel with Multi-Stage Equipment
All Braeburn zone panels are designed to work with multi-stage HVAC equipment. The 2-zone
panel will work with two heating stages and one cooling stage. The 3-zone panel will work
with up to three heating and two cooling stages. If multi-stage equipment is attached to the
zone panel, additional features will be used to maximize occupant comfort and economy.
The Braeburn 2-Zone Panel monitors the amount of time a heating call has lasted. Calls that
do not last very long will make maximum use of the more economical rst stage. If the call is
not satis ed after 20 minutes, the zone panel automatically activates the second stage.
The Braeburn 3-Zone Panel monitors time and the plenum temperature to maximize
economy. The plenum temperature sensor helps the equipment stage by looking at the supply
temperature and comparing it to the high or low limit. If the temperature differs by more than
the xed amount from the limit, the zone panel will permit staging. If the supply temperature
approaches the limit, the panel will shut off the second stage. If the supply temperature
crosses the high or low limit, the panel turns off the equipment, and switches the fan on until
the temperature comes back into limits. The 3-zone panel can also control a two speed fan.
Depending on the installer preferences, the fan can switch to high speed if either two zones
or two stages are calling.
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