FloAire Demand Control Ventilation System User Manual
Page 14
A0023662
May 2014 Rev.5
14
Max Air Flow:
By manually pressing the MAX AIR button, the fans will run at High Frequency, typically 60 Hz for a
factory set time of 30 minutes. This time is adjustable under the Misc Options section of the
configuration menu. Once the time period has expired or if the MAX AIR button is pressed again, the
VFDs will go back to operating based on the duct temperature.
Cool Down mode:
The fans will go into Cool Down mode when the duct temperature goes below the activation point
minus the temperature hysteresis of 2 degrees. For example, if the activation temperature is at 85
F
and the hysteresis is set to 2
F, Cool Down mode will start at 83F.
In Cool Down mode, the exhaust fans will run at the same speed than in Preparation Time mode and
the supply fans will turn off.
NOTE: The hysteresis timer, factory set at 30 minutes, is used to prevent the fans from cycling on
and off too often due to small appliances generating just enough heat to turn on the fans but not
enough to keep them ON for a long time. The Hysteresis Timer will maintain the fans on after they
have been activated by temperature for a minimum time set by this timer, even if the temperature in
the duct cools back down.
Manual Method: If the duct temperature is in the Cool Down mode range, the Hysteresis timer can be
bypassed by pressing the FANS button.
Fans Off:
If the system was in automatic operation, the fans will turn off when the duct temperature goes below
the Prep activation point minus the temperature hysteresis of 2 degrees. For example, if the Prep
activation temperature is at 80
F and the temperature hysteresis is set to 2F, then the fans will turn
off at 78
F.
NOTE: The Prep hysteresis timer, factory set at 30 minutes, is used to prevent the fans from cycling
on and off too often due to small appliances generating just enough heat to turn on the fans but not
enough to keep them ON for a long time. The Hysteresis Timer will maintain the fans on Cool Down
mode after they have been activated by temperature for a minimum time set by this timer, even if the
temperature in the duct cools back down.
Manual Method: If the duct temperature is below the Cool Down mode range, the Hysteresis timer
can be bypassed by pressing the FANS button. This will also turn the lights off. If the temperature
never went above the Prep activation point and the fans were turned on only by pressing the FANS
button, the pressing the FANS button will directly turn off the fans.