Grain Systems PNEG-163-08 - Manual (Page 14)

14 PNEG-163-08 Centrifugal Fan
3. Installation
Pre-Installation Requirements
Foundation
Use the dimension illustration in the specifications section on Page 20 of this manual to determine the
physical size of the fan to be installed. Use the dimensions shown to determine the position of the fan
installation with respect to other equipment.
For proper operation of the fan, the unit is to be mounted on a level pad. The fan should not be anchored
to the pad, but it should be allowed to “float” on the pad. The fan pad should be offset 2" below the
top of the bin foundation. Refer to
Figure 4F on Page 24 in the specifications section of this manual for
recommendations of pad placement with respect to various catalog transition ducts.
Transition
The transition duct should be all metal construction, with a gradual angle to the rectangular opening in the
bin wall. The duct should allow for a smooth transition with minimal resistance of the airflow from the fan
discharge to the bin plenum. Keep the entrance of the plenum as clear as possible from obstructions by
floor support.
Roof Exhaust
Adequate exhaust air openings in the roof are required to prevent any additional back pressure from
building in the bin. See roof damage warning
on Page 13 .
Power Supply
Adequate power must be supplied to the fan for reliable operation. Consult the local power company and
have a representative survey the installation. Only the power company can ensure that their system is
sized properly to provide adequate service to the installation and new equipment.
Wire Size
Undersized wire can lead to voltage drop which causes motor overheating and shortened motor life.
Use the electrical specifications chart
on Page 18 in this manual to size the supply wire according to
the horsepower of the fan and the distance to the power supply. Refer to the fan specifications
on Page 18 to find the full load current of the motor for a given fan size. The full load current can also
be found on the motor nameplate.
Service Disconnect
Each fan motor must be supplied with an independent power circuit, equipped with a fused disconnect
switch. Locate this switch near the unit, as the power should be shut off before servicing the fan.
It is the customer’s responsibility to provide a fused disconnect and motor overload protection.
These must be properly sized and connected to allow proper motor operation. Failure to provide
these components could cause severe motor damage and void the manufacturer’s warranty.