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Large Dehumidifying Dryers Mechanical Installation 23
; The power drop must include a ground wire.
; Make sure all electrical connections are tight.
3-4 Checking for Proper Blower Rotation
After the electrical connections have been made, check the process and regeneration blowers
for proper blower rotation. Check blower rotation before making process air connections
between the dryer and hoppers, and before connecting cooling water (for the optional
aftercooler).
Blowers should rotate in a clockwise direction. See Figure 7.
The blowers are rotating properly when air flows from the delivery outlet.
Incorrect phasing of power leads will cause backward rotation of blower motors and
contamination of the desiccant.
If both blowers are rotating improperly, reverse any two wires at the fused disconnect outside
the dryer or at the disconnect/terminal in the control enclosure. This assures that both blowers
will be rotating in the proper direction.
If just one blower is rotating incorrectly, reverse the wires at the motor starters.
Figure 7: Checking Blower Rotation
Process Blower Regeneration Blower