Fan Powered Variable Volume Terminal uniTs
6
FAn Powered VArIAbLe VoLume TermInAL unITs - manual | priceindustries.com
priceindustries.com | FAn Powered VArIAbLe VoLume TermInAL unITs - manual
INSTALLATION & MOUNTING INSTRUCTIONS
eCm motor adjustment
1. Remove the electrical control cover and connect the leads
from a DC voltmeter to the terminals indicated.
2. Determine test point voltage from the formula based on
the desired air flow.
3. Ajust the manual speed control dial on the outside of
the box with a screwdriver until the test point voltage is
achieved.
4. Wait a few seconds for the ECM motor to adjust its speed
and then verify fan flow with measurements at the supply
outlets.
5. If necessary, fine tune the speed control in accordance
with the measured outlet flow.
air balancing Procedure
Before Air Balancing the terminal unit, the following general
items should be verified.
1. The primary fan system is operating at the specified
volume, static pressure, RPM and current.
2. Return filters (if supplied) are clean.
3. All balancing dampers are adjusted and locked. Dampers
downstream of the terminal unit should be proportionally
balanced.
4. Thermostats are calibrated and operational.
5. All duct work and connections are free from leaks.
6. Sufficient duct static pressure is available at the terminal
primary air inlet.
7. All diffusers are installed and adjusted for the proper air
pattern.
8. Downstream duct static pressure is a minimum 0.1” W.G.
0.2” W.G. required for units with electric heater for stable
control operations.
9. The primary air volume (both minimum and maximum set
points) are factory calibrated for pneumatic or electronic
controls supplied by Price. If field adjustment should be
necessary, follow the appropriate calibration procedures
for the controller type supplied with the unit. If DDC
controls are supplied, refer to the control contractor’s
documentation for calibration instructions.
10. Set the thermostat to full cooling. The fan should be off
and the primary air valve at maximum air flow. Verify the air
flow with the sensor tube or pitot tube traverse. Adjust if
necessary.
11. Set the thermostat to full heating. The fan should be
on and the primary air valve at minimum flow. Verify the
primary air volume with sensor taps or pitot tube traverse.
Adjust if necessary.
12. The fan volume must be field adjusted with the fan speed
controller. Fan curves on page 8 indicate the volume range
of each size unit. Adjust the speed control until the desired
air flow is measured at the outlets. Note that if the primary
air valve has a minimum setting, the outlet volume will be
the summation of fan and primary air flow.
FDV Series
Size
Motor Volts
Equation
20
115, 240, 277 CFM = (178 x VDC) - 45
30
115, 240, 277 CFM = (474.21 x VDC) - 480.07
40
115
CFM = (540.9 x VDC) - 562.1
40
240
CFM = (552.2 x VDC) - 582.6
40
277
CFM = (536.1 x VDC) - 533.6
50
115, 240, 277 CFM = (634.84 x VDC) - 453.38
60
115, 240, 277 CFM = (479 x VDC) + 410
ConTrol assemblY label
