STEP 13B:
Determine test point voltage (VDC) from the formula based on the desired airflow using the appropriate chart below.
BTR Filters with FC Wheel
24"x24" FFU-HE
Voltage
Equation
115
VDC = (CFM+170)/169
240
VDC = (CFM+157)/159
277
VDC = (CFM+146)/166
24"x36" FFU-HE
Voltage
Equation
115
VDC = (CFM+292)/244
240
VDC = (CFM+229)/231
277
VDC = (CFM+200)/222
24"x48" FFU-HE
Voltage
Equation
115
VDC = (CFM+201)/250
240
VDC = (CFM+204)/252
277
VDC = (CFM+238)/262
RSR Filters with FC Wheel
24"x24" FFU-HE
Voltage
Equation
115
VDC = (CFM+104)/100
240
VDC = CFM+104)/100
277
VDC = (CFM+74)/98
24"x36" FFU-HE
Voltage
Equation
115
VDC = (CFM+179)/178
240
VDC = (CFM+179)/179
277
VDC = (CFM+172)/172
24"x48" FFU-HE
Voltage
Equation
115
VDC = (CFM+235)/237
240
VDC = (CFM+255)/241
277
VDC = (CFM+219)/234
FAN FILTER UNIT - HIGH EFFICIENCY
INSTALLATION & SERVICE INSTRUCTIONS
POTENTIOMETER
(POT)
MEASURE (+) VDC
MEASURE (-) VDC
ECMSC Speed Controller
VDC Equations
10
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