Greenheck Downblast Centrifugal Roof Exhaust GB-220

Adjust belt tension after the first 24-48 hours of operation

Adjust and tighten belt as necessary

Check all fasteners and setscrews for tightness

Does the wheel rotate freely and is it aligned as shown in Figure 7?

Was the wheel position preset and test run at the factory?

Is realignment necessary due to movement during shipment?

Centering height alignment accomplished by loosening the set screws and moving the wheel to the desired position

Disconnect and secure all electrical power to the fan.

Ensure the unit is made non-functional (fuses removed, disconnect locked off).

Are grease fittings provided on the motor?

Does the motor temperature exceed 104ºF (40ºC)?

Enter the current running time of the motor in hours.

Has the motor been running for 2000 hours or more?

Replace the grease in the motor if it has been running for 2000 hours or more and does not exceed the temperature limit.

Loosen the setscrew holding the bushing and shaft key in place, if present.

Loosen and remove the socket head cap screws fastening the bushing to the hub.

Select the mounting type for socket head cap screws installation

Tighten the socket head cap screws an eighth of a turn at a time, alternating until the hub comes loose from the bushing.

Clean all surfaces of hub and bushing to remove any oil or residue.

Select the mounting type for bushing and shaft key installation

Use the keyway setscrew to hold the shaft key and bushing in place, if present, without overtightening.

Disconnect all electrical power to the fan and secure to the 'off' position.

Ensure the unit is made non-functional by removing fuses and locking off the disconnect.

Check for oil and dust accumulation on the wheel and housing.

Clean the wheel evenly to prevent imbalance and vibration.

Clean the housing to ensure smooth operation.

Is the wheel balanced after cleaning?