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Premium Commercial Controls
ERV
32
UNIT OPERATION
The SA flow rate setpoint is entered and adjusted from the unit controller display or provided by
the BMS. The minimum and maximum values for SA flow rate setpoint are unit dependent. An
adjustable proportional and integral (PI) loop will compare the measured SA flow to the airflow
rate setpoint and adjust the fan speed. If the measured SA flow rate varies from the desired
airflow rate by more than 10% (adjustable) for more than 60 seconds (adjustable) a SA flow rate
alarm will be set to true. This supply fan operation mode can be used to provide a constant SA
flow rate as the unit filters become loaded.
5.2.3 Supply Duct Static Pressure Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the supply duct
static pressure at a setpoint. This option requires a field-installed duct pressure transmitter and
setup for the transmitter in the I/O configuration.
The SA duct static pressure setpoint is entered and adjusted from the unit controller display or
provided by the BMS. The minimum and maximum values for SA duct static pressure setpoint
are unit dependent. An adjustable PI loop will compare the measured SA duct 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 SA static pressure alarm will be set to true. This supply fan operation mode can
be used to provide a constant supply duct pressure for
VAV systems.
5.2.4 Room Static Pressure Control Option
The controller will adjust the supply fan VFD or ECM command to maintain the room static
pressure at a setpoint. This option requires a field-installed room pressure transmitter and
setup for the transmitter in the I/O configuration.
