Maintenance Troubleshooting Guide - Price FPV Series Manual Installation

Fan Powered Variable Volume Terminal uniTs
MAINTENANCE
Troubleshooting Guide
General
Noise
Primary Air Volume not as Specified
Air Volume Not As Specified
Fan Does Not Operate
16
FAn Powered VArIAbLe VoLume TermInAL unITs - manual | priceindustries.com
1. Confirm fan box size and rating with blueprint and box schedule (check Control
Assembly label on terminal unit).
2. Visually check pneumatic and electrical connections with the Control Wiring
diagram(s) located inside the electrical enclosure or in the applicable controls
brochure.
3. Verify that the supply voltage is the same as specified on the control diagram(s)
or Voltage Information label.
4. Confirm main air pressure (15 psi min., 25 psi max.)
1. Foreign material in fan.
2. Relay chatter.
3. Fan or duct size selection too small for application causing high air velocity.
4. Vibrating duct work.
5. Unbalanced fan wheel causing it to hit the housing.
1. Check controller operation, adjust if necessary.
2. Check for proper control signal from thermostat. Cycle thermostat and monitor.
3. Check operation of damper actuator and leakage.
4. Confirm sufficient inlet duct static pressure is available at the terminal unit.
5. There should be a minimum of 3 duct diameters of straight inlet duct, either
sheet metal or flexible. It is to be the same size as the inlet, between the
unit inlet and any transition, take-offs or fittings. Poor inlet conditions may
necessitate controller re-calibration.
6. Check the flow sensor for blockage.
1. Check filter for excessive dust build-up.
2. Check fan for particle blockage.
3. Check coils for particle blockage.
4. Measure downstream static pressure, it must be no less than 0.10 inches W.G.
in order to keep the fan from overheating.
5. Verify that the supply voltage is the same as specified on the wiring diagram.
See wiring diagram pasted on the inside of the electrical enclosure or
in the applicable controls brochure.
6. Insulating duct liner loose.
7. Unit was not air balanced. See Air Balancing Procedure on page 7.
8. Leaks in duct work.
9. Obstruction in duct work.
10. Sharp elbows near fan outlet.
11. Improperly designed turning vanes.
Check the unit wiring against the provided Control and Wiring diagrams. See
1.
inside cover of the electrical enclosure for diagrams.
2. Verify that the disconnect switch or breaker is not opened.
3. Check for proper control signal from thermostat. See thermostat for full heating
and monitor output.
4. If fan cycles on and off, check the downstream static pressure. It must be no
less than 0.10 inches W.G. in order to keep the fan from overheating.
5. Fan wheel may be touching the housing.