Price FFU series Installation And Service Manual page 37

FAN FILTER UNIT
INSTALLATION & SERVICE INSTRUCTIONS
Constant Torque – Clean Filters (Forward Curved)
Voltage Velocity
Volt FPM
45-90 VDC =
115
90-135 VDC =
45-90 VDC =
240
90-135 VDC =
45-90 VDC =
277
90-135 VDC =
Example: 24" x 48", FC Wheel, 115V @ 450cfm VDC = (CFM - 72)/155
VDC = (450 - 72)/155 VDC = 2.44V
NOTE: The calculated VDC value is intended as a starting point; actual VDC value may differ slightly depending on field variables.
STEP 2: 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.
ECM Speed Controllers have 2 modes: manual adjust and BAS (Building Automation System). Standard manual control
NOTE:
outputs are shown below:
Measurement Tab Voltage
The speed controller will automatically ignore the potentiometer (POT/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
0 - 1 VDC Local control mode using push buttons
1 - 2 VDC
2 - 9 VDC
9 - 10 VDC
EXAMPLE: If using a BAS signal, to calculate appropriate starting voltage, first calculate the VDC (as shown in above example)
VDC = 2.44 V
Then double this value
BAS Input Voltage = VDC*2
BAS Input Voltage = 2.44*2
BAS Input Voltage = 4.88V
24x24
BTR/FC RSR/FC
CFM + 188
CFM + 179
VDC =
292
310
CFM + 20 CFM + 87
VDC =
207 220
CFM + 233
CFM + 174
VDC =
309 322
CFM + 19 CFM + 93
VDC =
207 224
CFM + 140 CFM + 194
VDC =
283
295
CFM + 22 CFM + 88
VDC =
207 220
0 - 1 VDC
1 - 4.5 VDC
4.5 - 5 VDC
Response
Motor Off
Modulating Control
Maximum Speed
24x36
BTR/FC RSR/FC
CFM + 156 CFM + 155
VDC = VDC =
312
CFM - 81 CFM + 35
VDC = VDC =
193
CFM + 177 CFM + 195
VDC = VDC =
322
CFM - 70 CFM + 63
VDC = VDC =
197
CFM + 147 CFM + 170
VDC = VDC =
314
CFM - 33 CFM + 24
VDC = VDC =
221
Local setpoint can be adjusted from 0 - 100% using push buttons
Recommended sending a 1.5 VDC signal to command motor off
2 - 9 VDC modulates motor from 0 - 100%
Motor is running at maximum speed (100%)
priceindustries.com | FAN FILTER UNIT - Manual
24x48
BTR/FC
CFM + 142
VDC =
306 338
CFM - 138
VDC =
232 212
CFM + 139
VDC =
330 336
CFM - 138
VDC =
250 212
CFM + 140
VDC =
335
317
CFM - 142
VDC =
226 209
Motor Control
Off
0-100%
100%
Notes
RSR/FC
CFM + 212
VDC =
367
CFM - 59
VDC =
223
CFM + 207
VDC =
363
CFM - 55
VDC =
224
CFM + 216
VDC =
365
CFM - 64
VDC =
365
35