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16. ELECTRICAL INSTALLATION & OPERATION
DANGER!
No work must be attempted before completely isolating the fan assembly, its anti-condensation heater
(if fitted), and its controls from all electrical supplies. Ensure that rotating parts come to rest.
WARNING!
Before entering the area where the fan is installed, please ensure that all fumes, dust, toxic emissions,
heat etc. have dispersed from the local environment, and that the fan blades are not likely to rotate.
DANGER!
The fan assembly contains rotating parts and electrical connections which can be a danger and cause injury.
If there is any doubt that a safe and reliable fan installation can be assured; Woods Air Movement USA or their
representative must be contacted for advice.
WARNING!
If the fan assembly is designed for high-temperature emergency-use; it is imperative that the wiring used is rated
and designed for the appropriate high temperature category, and that all switches and controls are overridden
during the emergency operation. Only Frequency Converters which have been fully tested and certified in
accordance with EN12101-3:2015 may be used.
CAUTION!
If the fan stops operating due to an overheat situation, the overheat protection thermostat may reset as
the temperature cools and then automatically restart the fan if power is still applied.
WARNING!
Always wear appropriate protective clothing (including hard hats, eye protectors and ear defenders etc.) when
working in the vicinity of the fan assembly.
Each fan assembly has either a terminal box mounted on the motor or on the fan housing. The fan assembly electrical supply
must be connected to the terminal box by a qualified and competent electrician. It is good practice to fit a clearly marked isolator
switch close to the fan. In addition, we recommend the use of a second clearly marked and accessible switch remote from the
fan. Using two switches provides an enhanced level of safety when isolating the fan during maintenance. A suitable earth must
also be connected. Sufficient cable length must be provided to allow for movement of the fan on its mountings.
A connection diagram providing wiring details is supplied with all fan assemblies (typically inside the terminal box lid). Figure
3 (page 18) show wiring terminal details. Figure 2 (page 17) shows the correct assembly sequence of terminal box parts. For
recommended torque values, please request these from Woods Air Movement USA. It is essential that no lock washers or nuts
are used between the motor lead eyelet, connecting link or customers supply lead eyelet (when fitted).
Electrical control circuit Fuses must be correctly selected to carry the rated starting current as indicated on the motor or
fan nameplate but should only be regarded as offering protection against wiring short circuits or earth faults. Fuses are not
designed to provide overload protection. To provide full protection for the motor, a starter panel with overload protection must
be used. We also recommend that an electrical isolator switch is incorporated into the connection circuit and that it is of the
lockable type, which will allow the operator or maintenance engineer to isolate the fan from the electrical supply before working
on the assembly.
If a speed controller, or other control equipment, forms part of the system it must be able to control the fan within safe limits.
When running fans at low speed, care must be taken to ensure that any shutters (dampers), which may be mounted in the
airflow, will open and operate correctly. Control equipment should be securely located, and should not be, or cause, a radiation
hazard.
Fans with a fan housing-mounted terminal box must have their electrical supply cables routed through an entry point in the
side of the terminal box. Unused entry points must be sealed with weatherproof plugs or grommets. Fans with a motor-
mounted terminal box must also have its electrical supply routed through an entry point in the side of the terminal box.
Cables must be routed via a gland assembly. The gland assembly should be tightened sufficiently to hold the cable and provide a
weatherproof seal, but it must not be over-tightened.
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