Step 3:
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 4:
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 5:
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 6:
Proceed to Balancing section of this manual.
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Fan Filter Units |
Installation Instructions
