FAN FILTER UNIT
INSTALLATION INSTRUCTIONS
Step 2:
For local control, adjust at the speed controller using the up and down arrows. For BACnet control, adjust point "AO3 -
ECM Setpoint" on Front End System.
Step 3:
For BAS analog voltage control, ensure correct voltage is applied to AI1 & COM based on the VDC equations provided in
the tables. Also refer to table below for BAS control responses.
BAS Voltage
Response
Notes
0 - 1 VDC
Local control mode using push buttons
Local setpoint can be adjusted from 0 - 100% using push buttons
1 - 2 VDC
Motor Off
Recommended sending a 1.5 VDC signal to command motor off
2 - 10 VDC
Modulating Control
2 - 10 VDC modulates motor in accordance with VDC equations
The VDC equations are based on a 1-5 Volt scale. The BAS input voltage is a 2-10 VDC scale, and therefore VDC calculated for a
given CFM using the equations must be doubled to achieve that CFM using the BAS input.
NOTE:
The calculated ECM setpoint is a starting point; actual value may differ slightly depending on field variables.
NOTE:
The BAS signal will override the local setpoint using a remote 0 – 10 VDC signal. If the BAS signal drops below 1 VDC local
control (via the up/down buttons) is restored.
Step 4:
Wait a few seconds for the ECM motor to adjust its speed and then verify fan airflow with measurements at the supply
outlets using a flow hood. Adjust voltage to reach desired airflow as required.
Step 5:
Proceed to
Balancing
section of this manual.
Exhaust - Constant Flow – Clean Filters (Forward Curved)
Voltage
Velocity
24 x 48
Volt
FPM
RSR - FC
115
45-135
ECM% = (CFM/7.63) - 18
240
45-135
ECM% = (CFM/7.63) - 18
277
45-135
ECM% = (CFM/7.53) - 18
Exhaust - Constant Torque – Clean Filters (Forward Curved)
Voltage
Velocity
24 x 48
Volt
FPM
RSR - FC
115
45-90
ECM% = (CFM/13.09) - 6
90-135
ECM% = (CFM/7.77) - 30
240
45-90
ECM% = (CFM/13.3) - 6
90-135
ECM% = (CFM/7.74) - 30
277
45-90
ECM% = (CFM/13.09) - 6
90-135
ECM% = (CFM/7.63) - 31
11
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