Electrical Connections; Unit Start-Up - Greenheck MOA Installation, Operation And Maintenance Manual

Electrical Connections

Before electrical connections are made, the supply voltage, phase and ampere capacity must be checked for
compatibility with the fan motor. In addition, the supply wiring must be properly fused and conform to local and
national electrical codes. If the unit is supplied with a safety disconnect switch, ensure proper wiring to the fan
motor. Be sure the disconnect is switched to the "OFF" position before connecting supply wires. If no disconnect is
supplied, ensure the supply wire is not live before connection. Supply wires are then connected to the optional safety
disconnect switch (if supplied) or motor. For more information regarding electrical connections, please see Electrical
IOM, part number 486462.

Unit Start-Up

Disconnect and secure to the "OFF" position all electrical power to the array prior to inspection or servicing. Failure
to comply with this safety precaution could result in serious injury or death.
Visual Inspection of Equipment
The equipment type and arrangement should be verified as ordered at once when it arrives at the jobsite. When
a discrepancy is found, the local sales representative must be notified immediately so that corrective action may
be investigated. Also, verify electrical conformance to specifications. Unauthorized alterations and unauthorized
backcharges will not be recognized by the manufacturer.
After the array has been assembled, installed and all utilities have been hooked up, the unit is now ready for
operation.
Check
Before starting the array, check the following:
1. Confirm that building supply voltage matches the voltage for which the unit is wired.
2. Disconnect and lock-out all power switches to the array. See warning above.
3. Check all piping and wiring penetrations made by contractors for water tightness. All penetrations must be made
watertight to prevent water damage to the unit and building.
4. Check all fasteners, set screws and locking collars on the array, bearings, drive, motor base and accessories for
tightness.
5. Rotate the wheel by hand and assure no parts are rubbing. Remove any dirt or debris that may have
accumulated during installation.
6. Check all guarding (if supplied) for being securely attached and not interfering with rotating parts.
7. Check all electrical connections for proper attachment.
8. Check for obstructions and foreign material that may damage the wheel.
Additional Steps for Initial Start-Up
1. Check for proper wheel rotation by momentarily energizing the fan. Rotation is always determined by viewing the
wheel from the drive side and should correspond to the rotation decal affixed to the unit.
One of the most frequently encountered problems with centrifugal fans is motors which are wired to run in the
wrong direction. This is especially true with 3-phase installations where the motor will run in either direction,
depending on how it has been wired. To reverse rotation of a 3-phase motor, interchange any two of the three
electrical leads. Single phase motors can be reversed by changing internal connections as described on the motor
label or wiring diagram.
2. Arrays with multi-speed motors should be checked on low speed during initial start-up.
3. Check for unusual noise, vibration or overheating of bearings. Refer to the "Troubleshooting" section of this
manual if a problem develops.
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CAUTION
NOTE
Modular Open Array 21