Polyaire airtouch - Setting Minimum Ventilation; Spill or Bypass

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5.6 Setting Minimum Ventilation
Groups with ITCs can have minimum ventilation settings to meet relevant
requirements in light commercial applications. This is done in grouping settings.
Go to Grouping page, set the Min Vent for each group which has temperature
control. When the set point has reached, the damper of the group will not be fully
closed but have the set Min Vent opening to circulate the air. But if the group is
turned o, the damper will be fully closed. The maximum ventilation is 40%.
Press Save button to save the setting.
5.7 Spill or Bypass
Spill or bypass mode is a safety feature of the AirTouch 4 system to prevent
pressure from building up and causing duct damage. This usually occurs if
someone has turned o all groups while the A/C unit is pumping air into the
system leading to a pressure build-up (and potential of duct puncture, blow-os
or joints splitting).
It is designed to automatically open dampers if someone attempts to shut down
all dampers thus preventing pressure build up. Spill function opens the groups
chosen as spill groups in the system when all groups are being closed. Bypass
function opens the bypass damper which connects the supply duct to the return
duct directly when all groups being closed. When choosing groups for spill, it is
strongly recommended NOT to use bedrooms as spill groups. During sleep time if
the air conditioner is on and spill groups are forced to open, the spill groups will be
very cold or hot.
The system will maintain the number of groups chosen as spill groups open at any
time when AC is running. For instance, there will be at least two groups open if two
groups are chosen for spill. The rst group in the chosen spill group list will open
rst to spill. The maximum number of spill groups is half of the total groups.
Press Save button to save the setting.
Continued on next page.
Setting Minimum Ventilation & Spill or Bypass