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15. MECHANICAL INSTALLATION
DANGER!
It is recommended that suitable safety guards form part of the Installation. Such devices, and advice on safety
devices, are available from Woods Air Movement USA.
WARNING!
Where the fan is delivered in a crate (or similar), the crate must be considered as a protective device only, and
must not be used as a lifting aid unless otherwise indicated.
WARNING!
All lifting aids used during installation must be adequately certified to carry the weight of the equipment being
lifted.
WARNING!
Always wear appropriate protective clothing (including hard hats, eye protectors and ear defenders)
when working in the vicinity of the fan assembly.
WARNING!
During lifting of the fan all personnel must be clear of the area below the suspended fan.
NOTE!
Before fan assembly installation, check that no damage has occurred in transit, that there is no fan casing
deformation, that the impeller rotates freely and that the fan and motor nameplate data complies with its use
requirement. If the fan assembly has been stored (for an extended period) the motor winding resistance to earth
must be measured (at 500V dc). Where any reading is less than 10 MΩ (Megaohm), the motor must be dried out
and re-checked before it is switched on.
Fan assemblies can sometimes be very heavy (depending on fan and motor size and which ancillary equipment has been fitted,
such as silencers, guards and bellmouths etc.), which can make them unwieldy during handling. They must therefore be lifted
slowly to prevent damage or distortion. Proper precautions must be taken, and certified lifting aids used, to ensure that the
fan is well supported and stable before lifting into position.
Flange holes or mounting feet holes can be used for lifting but more than one hole must be used to spread the load.
If special lifting points are provided, they must be used. The fan must be installed such that it is correctly positioned in
accordance with the required airflow direction. An airflow indication arrow is shown on the fan nameplate. For two-stage,
contra-rotating fans see Figure 1 (on page 17).
Sharp bends in the ductwork close to the fan must be avoided. Adequate room must be allowed round the fan for inspection
and maintenance. Component parts of the fan assembly, including (if fitted) anti-vibration mounts, silencers, bellmouths,
air operated dampers, flexible connectors (and their clips), purlin boxes, weather proofing, platforms, supports, chains and
harnesses, etc. must be fully aligned before being bolted together so that no distortion or stress is placed on the equipment.
Air operated dampers must be installed downstream of the fan (on the fan discharge) to ensure that fan performance is not
adversely impacted.
Appropriate fasteners, with the correct torque applied, must be used to secure the fan into position. If in doubt, please contact
Woods Air Movement USA for advice related to torque settings for each fastener. The fan mounting and support structure
must be strong and rigid enough to take the weight and operating forces of the fan and any other weight applied during
installation. Vibration isolators must be appropriate for the weight and thrust of the fan, in order to minimize the transmission
of fan vibration to surrounding structures. When vibration isolators are used, flexible connectors and flexible electrical conduit
must also be used. Vibration isolators and flexible connectors must not be used to compensate for misaligned component
fixing points. If any component parts do not easily fit together the root cause must be investigated and rectified.
A drain hole is included within in each motor end cover and electrical connection terminal box. The motor drain hole must
be located at the lowest point of the motor, when the fan is installed. Plugs which close drain holes should either be removed
entirely (if condensation is liable to occur due to large variations in operating temperature) or removed periodically to allow any
general build-up of condensation to drain away. The frequency of plug removal will depend on by environmental conditions
and should be recorded within maintenance records.
After installation, all packing materials must be disposed of in accordance with Paragraph 20 (page 15).
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