FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
BTR Filters with FC Wheel
24"x24" FFU-HE
Voltage
Equation
115
L. Set = (CFM/5.90)
240
L. Set = (CFM/5.58)
277
L. Set = (CFM/5.81) - 4
24"x36" FFU-HE
Voltage
Equation
115
L. Set = (CFM/8.54) + 6
240
L. Set = (CFM/8.07)
277
L. Set = (CFM/7.75) - 3
24"x48" FFU-HE
Voltage
Equation
115
L. Set = (CFM/8.77) - 6
240
L. Set = (CFM/8.82) - 5
277
L. Set = (CFM/9.16) - 1
RSR Filters with FC Wheel
24"x24" FFU-HE
Voltage
Equation
115
L. Set =(CFM/3.52) + 1
240
L. Set = (CFM/3.49) + 1
277
L. Set = (CFM/3.41) - 7
24"x36" FFU-HE
Voltage
Equation
115
L. Set = (CFM/6.23)
240
L. Set = (CFM/6.27)
277
L. Set = (CFM/6.03)
24"x48" FFU-HE
Voltage
Equation
115
L. Set = (CFM/8.30)
240
L. Set = (CFM/8.43) + 2
277
L. Set = (CFM/8.20) - 2
STEP 16C:
If manually adjusting at the speed controller ensure controller is in Local Setpoint mode (L.SEt). To change modes,
press the up and down arrows simultaneously until you reach L.SEt.
STEP 17C:
Enter the Local Setpoint value (L. Set) you have found from the chart by using the up/down buttons.
NOTE:
The L.Set calculated above 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.
The ECMDX speed controller can be controlled using multiple strategies; these are outlined in the chart below.
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%)
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 (refer to ECM speed controller on page 10) must be doubled to achieve that CFM using the BAS
input.
STEP 18C:
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.
NOTE:
If unit is ducted, please refer to
Technical Note: Balancing Ducted Units
on page 44 of this manual.
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