FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
Example:
24”x48”, FC Wheel, 115V @ 450cfm
VDC = (CFM + 201)/250
VDC = (450+201)/250
VDC = 2.60V
The potentiometer (POT/DIAL) would need to be turned up until the voltage measured 2.60 at the Measurement Tabs
NOTE:
The calculated VDC value is intended as a starting point; actual VDC value may differ slightly depending on field variables.
NOTE:
ECM Speed Controllers have 2 modes: manual adjust and BAS (Building Automation System). Standard manual control
outputs are shown below:
Measurement Tab Voltage
Motor Control
0 - 1 VDC
Off
1 - 4.5 VDC
0-100%
4.5 - 5 VDC
100%
The speed controller will automatically ignore the potentiometer (POT/DIAL)/DIAL when a BAS signal is detected (BAS Input Signal
>1). VDC equations are for potentiometer (POT/DIAL) manual adjustment only (0-1 BAS input signal). 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
equation must be doubled to achieve that CFM using the BAS input.
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 - 9 VDC
Modulating Control
2 - 9 VDC modulates motor from 0 - 100%
9 - 10 VDC
Maximum Speed
Motor is running at maximum speed (100%)
STEP 14B:
If using potentiometer/manual adjustment, rotate the potentiometer (POT/DIAL) dial on the outside of the box with a
screwdriver until the test point voltage is achieved.
EXAMPLE:
If using a BAS signal, to calculate appropriate starting voltage, first calculate the VDC (as shown in above example)
VDC = 2.60 V
Then double this value
BAS Input Voltage = VDC*2
BAS Input Voltage = 2.60*2
BAS Input Voltage = 5.20
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