Universal Single Width Fans14
Additional Steps for Initial Start-Up
1. Check for proper wheel rotation by momentarily energizing the fan. Access to view
the wheel can be gained through the blower housing access panel.
One of the most frequently encountered problems are motors that are wired to rotate
the wheel 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. Fans 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.
4. Grease may be forced out of the bearing seals during initial start-up. This is a normal self-purging feature for
the type of bearing used on this product.
NOTE
Model USF units should be operated only when attached to the system for which they were designed. Without
proper system static pressure, the motor could be overloaded.
Model USF Series 100, Direct Drive, Backward-Inclined – Variable Speed Drives
The USF series 100, direct drive with BI wheel comes equipped with a factory integrated speed controller.
Single-Phase Models
EC Motor - Models with 3/4 HP or less will be provided with a Vari-Green
®
motor and potentiometer dial to
adjust motor RPM. To change the speed, simply turn the dial.
Integrated VFD - Models selected as single phase above 3/4 HP will be provided with a mounted, wired and
programmed VFD controlling a premium induction motor. Changing speeds on a VFD model involves pressing
the up and down arrows located on the VFD interface.
Three-Phase Models
Models selected for three phase power will be provided with a mounted, wired and programmed VFD and
premium induction motor. Changing speeds on a 3-phase model involves pressing the up and down arrows
located on the VFD interface.
Both Single and Three-Phase - Both models feature a built in electrical disconnect and the option for
external control through 0-10 VDC signal.
NOTE
These models are selectable with different speed control options. Please review your submittal to see how the
unit was selected to be controlled. IOMs for these control types can be found at
www.greenheck.com/vari-green.
NOTE
These models are selectable with different speed control options. Please review your submittal to see how the
unit was selected to be controlled. IOMs for these control types can be found at
www.greenheck.com/vari-green.
NOTE
These models are selectable with different speed control options. Please review your submittal to see how the
unit was selected to be controlled. IOMs for these control types can be found at
www.greenheck.com/vari-green.
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