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11. Building Pressure Control (BPC)
The M3 unit controller supports building pressure control of ventilation. This feature will modulate the outdoor air damper
in order to hold a constant building pressure. This mode requires an A34 building pressure sensor to be installed on M3
unit controller IAQ input (instead of CO2 sensor).
The Building Pressure Control option provides the ability to maintain a constant building pressure. A building pressure
(A34) sensor located in the outdoor air section of the unit measures the difference between the outdoor and indoor
(building) pressure and relays the information to the M3 unit controller. Based on the pressure information, the unit
controller automatically adjusts the damper position and maintains a constant building pressure.
To enable this feature, Go to SETTTINGS > RTU OPTIONS >DAMPER > DAMPER CONTROL VENTILATION
OPTIONS and select BLDNG PRESS CTRL > PRESSURE SETPOINT = X.X IN H20.
See parameters 134 and 327 through 329 for additional settings (see table 63 starting on page 114).
Alarm 103
If both Advanced Airflow and building pressure control are enabled, then Alarm 103 will be activated. The alarm is based
on the parameter 134 setting.
Alarm 106
Alarm 106 is activated when A34 sensor is detected to be faulty.
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