ALX SERIES
SPUN ALUMINUM EXHAUSTERS
ALX-M-06_27_22
Page 2 of 7
1.
A qualified electrician in accordance with all local and National Electrical Codes should do all wiring.
2.
Ensure power supply is disconnected and locked out prior to making electrical connections.
3.
Wire the motor according to the wiring diagram on motor label or on the sticker inside the motor wrap. All motors should be wired to
the same rotation as indicated on the sticker on the top plate.
4.
Leave enough slack in the wiring to allow for motor movement when adjusting the belt tension.
5.
Excess wire must be restrained in order to prevent it from entering the pulley, shaft or wheel rotating area.
6.
Disconnect switches are recommended and should be located near the fan in order to, swiftly cut off power in case of an emergency
and maintain complete control of the power source.
Some single phase direct drive motor’s running RPM can be adjustable with a variable speed control (please contact factory for more
information). The speed control knob starts at off position, then high to low adjust range. At high speed, the speed control would allow the
motor running at its maximum RPM. Dial the knob to the low side would let the speed control regulate the voltage on the motor to reduce
the RPM.
A minimum speed adjustment is needed to limit the motor RPM range. Follow this procedure to set the minimum speed.
1.
Motor must be in servicing status to allow the minimum speed setting. Motor would not slow down unless proper load is applied.
Motor RPM would be changed under different system (static pressure).
2.
Turn the main control knob to the lowest speed position.
3.
Locate and adjust the minimum speed setting, it can be found on the control box itself.
4.
Motor RPM range would be from full RPM to the RPM just set.
The lowest minimum voltage that may be applied to the motors is 65VAC. Running at lower voltage can cause premature failure
to the motor.
For 3 phase motors, a variable frequency drive (VFD) is required to adjust motor speed.
VARIABLE SPEED CONTROL – SINGLE PHASE
VARIABLE FREQUENCY DRIVE – THREE PHASE
INSTALLATION
RECOMMENDED
ROOF OPENING
WIRED TO POWER
BY OTHERS
ROOF
DECK
OPTIONAL DISCONNECT CAN
BE MOUNTED INSIDE THE
HOUSING OR OUTSIDE
MINIMUM 12”
RECOMMENDED
ROOF OPENING
ROOF
DECK
MINIMUM 12”
WIRE OPTION 2:
WIRE THROUGH
THE VENT TUBE
WIRE OPTION 1:
THROUGH CONDUIT
GENERAL CLEAN AIR APPLICATION (UPBLAST)
GENERAL CLEAN AIR APPLICATION, DOWNBLAST
Note: ALX105 to ALX120 has only wiring option 1, ALX135 to ALX180 has both
wiring options 1 and 2, ALX210 and larger has only wiring option 2.
STANDARD WIRING INSTRUCTIONS
1.
Install roof curb, caulk and flash to ensure the water tightness.
2.
Rotate the blower wheel by hand. Wheel should not be rubbing against the housing inlet. If rubbing occurs, loosen the set screws on
the wheel hub and shift the wheel to obtain clearance. Then re-tighten all set screws.
3.
Complete all subsequent duct connections.
4.
Secure the fan to the curb cap. Do not lift the unit by the hood or motor. Lift the unit by horizontal supports on direct drive or by motor
mounting plate for belt drive unit.
5.
Use at least 8 proper fasteners to connect the blower base to the roof curb.
6.
Verify if the power supply is compatible with the equipment.
7.
Make sure the power line is shut down before wiring the motor to power line.
8.
Remove top cap, connect power line to the motor/disconnect switch as indicated.
9.
For all up blast units, the electrical supply enters the motor compartment through the vent tube.
10.
Ensure all fasteners and set screws are tightened.
11.
Place the top cap back on the hood.
12.
Caulk and flash the fan base including the fan base corners and roof curb to ensure good water tightness.
