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Premium Commercial Controls
ERV
UNIT OPERATION
The room static pressure setpoint is entered and adjusted from the unit controller display.
The minimum and maximum values for room static pressure setpoint are unit dependent. An
adjustable PI (proportional & integral) loop will compare the measured room static pressure to
the static pressure setpoint and adjust the fan speed. If the measured static pressure varies
from the desired static pressure by more than 0.05" w.g. (adjustable) for more than 60 seconds
(adjustable) a room static pressure alarm will be set to true. This supply fan operation mode can
be used to provide a constant static pressure in an area to control infiltration or exfiltration from
an adjacent area or outdoors.
5.2.5 CO2/VOC Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the room or RA CO2
or VOC level at a setpoint. This option requires a field-installed CO2 and/or VOC sensor or value
from a BMS and setup for the sensor in the I/O configuration.
The CO2/VOC setpoint is entered and adjusted from the unit controller display or provided
by the BMS. An adjustable PI loop will compare the measured CO2/VOC level to the CO2/
VOC setpoint and adjust the fan speed. The minimum and maximum fan speed commands
are adjustable. If the measured CO2/VOC level exceeds 1000 ppm (adjustable) for more than
60 seconds (adjustable) a CO2/VOC alarm will be set to true. This supply fan operation mode
can be used to provide demand-controlled ventilation of a space. The minimum fan speed will
provide the required minimum outdoor air when the CO2/VOC level is at or below the CO2/VOC
setpoint.
