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5 Electrical Wiring, and Start-Up
5.1 Motor Wiring
Only qualified personnel should perform motor wiring. Review motor nameplate for
wiring diagram and wiring information. Many Sonic motors are dual rated for 50 and 60
hertz operation and therefore will have two nameplates. Every motor is supplied with a
sticker indicating the hertz set up of the blower unit.
Never run a Sonic blower open to the atmosphere as this can cause overloading and
damage to the motor.
All Sonic blowers must rotate clockwise (CW) when viewing the pulley or counter
clockwise (CCW) when viewing the cooling fan end of the motor. See the arrow
mounted on the motor housing for direction of rotation.
Sonic blowers are shipped with the drive belt removed. This is because the motor
rotation should be checked before installing the belt. Running the blower / motor
assembly backwards will cause the blower to under perform by 20%. Running backwards
for prolonged periods will cause premature failure of the belts and permanent damage to
the belt tensioner assembly. Refer to the Motor Rotation Sticker (below) located on the
mounting bracket for correct motor rotation and belt installation.
Figure 35 - Motor Rotation Sticker
If the Blower is subject to multiple Starts/Stops or more than one every seven (7)
minutes, then installation of a Soft Start or Sonic Air Diverter (Y-Verter™ Valve) is
recommended
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