XII. Fan / Blower Wiring Diagram

Wiring should always be done by a licensed electrician!

Before Operation - Before making electrical power connections, check for proper grounding of motor and application. All electrical contacts and connections must be properly insulated and enclosed. Coupling, belts, chains or other mounted devices must be in proper alignment, balance and secure to insure safe motor operation.

Electrical Wiring - Prior to connecting to the power line, check motorplate for proper voltage and rotation connection. This motor should be installed in compliance with the National Electrical Code and any other applicable codes. Voltage at motor not to exceed + or - 10% of nameplate voltage. Licensed electrician should make all electrical connections.

Electrical Disconnects - Every motor driven fan should have an independent disconnect switch to isolate the unit from the electrical supply. It should be near the fan and must be capable of being locked by maintenance personnel while servicing the unit, in accordance with OSHA procedures.

Always use the wire diagram on the motor plate. Sometimes the wire diagrams on the motor will be for different rotation. Wire for counter-clockwise rotation.

Follow Motor Plate for wiring diagram.

Locate factory applied rotation arrow on blower cabinet to establish rotation direction. It is not possible to know beforehand, which direction a 3-phase motor will rotate. ‘Bump’ start the motor and observe the direction of rotation of the end of the blower shaft (see hole in NYB outer cabinet that is aligned with the end of the blower shaft.)

Motor should be wired per factory applied rotation arrow on cabinet. Sticker located on backside of blower.

***

Motor

Wire

Box

Green

Chassis

Screw

Ground: Connect house ground wire to green chassis screw in motor wire housing box.

To reverse rotation interchange any two power line leads.	12

10 HP Pulley Drive Owner’s Manual c O.A.S. 2007