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General Safety Information
Only qualified personnel should install this fan. Personnel should have a clear understanding of these instructions
and should be aware of general safety precautions. Improper installation can result in electric shock, possible
injury due to coming in contact with moving parts, as well as other potential hazards. Other considerations may
be required if seismic activity is present. If more information is needed, contact a licensed professional engineer
before moving forward.
1. Follow all local electrical and safety codes, as well as the National Electrical Code (NEC) and the National
Fire Protection Agency (NFPA), where applicable. Follow the Canadian Electric Code (CEC) in Canada.
2. The rotation of the wheel is critical. It must be free to rotate without striking or rubbing any stationary
objects.
3. Motor must be securely and adequately grounded.
4. Do not allow the power cable to kink or come in contact with oil, grease, hot surfaces or chemicals. Replace
cord immediately if damaged.
5. Verify that the power source is compatible with the equipment.
6. Before installation, it is important to be certain the mounting surface will bear the operating weight of the
unit. For proper unit operation, it is also important that it be operated in a completely level position.
7. For further details on safety practices involving industrial and commercial fans, please refer to AMCA
Publication 410.
8. All fan motors should have disconnects located in close visual
proximity to turn off electrical service. Service disconnects shall
be locked-out when maintenance is being performed.
9. All moving parts must have guards to protect personnel.
Refer to local codes for requirements as to the number, type
and design. Fully secure fan wheel before performing any
maintenance. The fan wheel may start "free wheeling" even if all electrical power has been disconnected.
Before the initial start-up or any restart, check the fan assembly to make sure that all parts are securely
installed and in working order.
• Do not spin fan wheel faster than the maximum cataloged fan RPM.
• Adjustments to fan speed significantly affects motor load. If the fan RPM is changed, the motor current
should be checked to make sure it is not exceeding the motor nameplate amps.
Guards – Motor Cover, Weatherhood, Shaft, Belt, Inlet or Outlet Guard
Do not operate fans without proper protective devices in place. Failure to do so may result in serious bodily
injury and property damage. Check local codes to ensure compliance for all protective devices.
Access Doors
Before opening access doors, ensure the fan wheel has stopped moving and that the wheel has been secured
from being able to rotate. Do not operate fan without access door in its fully closed position.
Air Pressure and Suction
In addition to the usual hazards associated with rotating machinery, fans also create a dangerous suction at the
inlet. Special caution needs to be used when moving around a fan, whether it is in operation or not. Before start-
up, make sure the inlet area is clear of personnel and loose objects.
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.
®
NOTE
Some USF models may include an
integrated electrical disconnect mounted
and wired into the fan from the factory.
Universal Single Width Fans
3
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