XG-Fan Powered Air Terminals Rev 2
6
Troubleshooting
If the fan motor does not energize:
5
With the power off, verify for free rotation of fan blower wheel
using standard safety precautions.
5
Check for proper supply voltage.
5
Disconnect switch (if supplied), should be in the ON position.
5
Check fan motor fusing (always use time delay fusing).
5
Check for proper control signal, 24 VAC at fan.
5
Verify contractor and fan relay energized.
5
If Parallel Variable Fan Air Terminal, verify there is a call
for fan.
Excessive Noise When Fan Motor Runs
5
Check for clearance problems with fan motor and blower
components.
5
Check that all components are properly assembled.
5
Verify the ductwork does not have any leaks or loose con-
nections and diffusers are not rattling or balancing dampers
are not generating noise.
5
Verify maximum CFM is not too high or discharge static
pressure too low.
Insufficient Air Flow
5
Check for restrictions in ductwork.
5
Check for dirty or clogged hot water coils (if supplied).
5
Verify intake filter is not clogged or dirty (if supplied).
5
Re-adjust SCR motor speed control.
5
Verify discharge static is not too high.
Note:
If repair or replacement of fan blower or motor is re-
quired, the fan motor and blower should be removed as
an assembly.
Fan Motor/Blower Removal
1. Disconnect power to XG-Fan Powered Air Terminal.
2. Remove bottom fan motor/blower access panel.
3. Disconnect motor wires for fan motor.
4. Remove the two bottom screws holding motor/blower as-
sembly to XG-Fan Powered Air Terminal discharge end plate
bracket.
5. Loosen the top two screws holding motor/blower assem-
bly to XG-Fan Powered Air Terminal discharge end plate
bracket.
6. Lift the fan motor/blower
assembly upward to disengage the
top two motor screws.
7. Do not allow the fan motor/blower assembly to hang from
the power leads.
Fan Motor Removal from Blower
1. Loosen the blower wheel hub set screw to fan motor shaft.
2. Remove the 3 screws holding motor leg brackets to blower
housing.
3. Slide the fan motor out of the fan blower wheel.
4. Reverse steps 1-3 to re-install motor to blower wheel.
5. Verify isolation grommets are in place on the fan motor legs.
6. Verify the blower wheel set screw is properly torqued and
LOCKTITE has been applied to threads.
7. Do not over tighten the fan motor leg mounting screws.
Electric Duct Heater
Caution: Use extreme care if testing the electric
heater with power on!
The control cabinet contains live electrical parts. Contact-
ing these parts with the power applied may cause serious
injury or death.
Caution: This unit should be serviced by a licensed
electrician or a similarly qualified electrical service
technician!
If the electric heater does not operate:
5
Check electric power into the unit and verify the input power
agrees with the label data.
5
Verify the Air Terminal is installed properly (according to the
air flow orientation).
5
Review the wiring diagram attached to the inside of the
control enclosure cover to verify the field wiring is correct
with proper gauge wire, overcurrent protection and properly
grounded.
If the electric heater cycles on and off:
5
Verify the air flow is uniformly distributed across the face of
the heater elements.
5
Check for obstructions in the duct or insufficient air flow. (70
CFM per kW required)
If conditioned space fails to warm up:
5
Verify the electric heater controls and thermostat are com-
patible and wired properly.
5
Relocate the room thermostat if it is located in position that
is too warm.
If condition space overheats:
5
Verify the electric heater controls and room thermostat are
compatible and wired properly.
5
Relocate the room thermostat if it is located in position that
is too cold.
5
Verify the air distribution to the space is appropriate for the
required thermal load.
