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CAUTION!
The bearing life is estimated by calculations according to ISO 281:2007-02 to give a L10 life. Beyond each
periodical maintenance, our recommended bearing condition check frequency is at each lubrication. Depending
on the results, bearings may need to be replaced.
CAUTION!
Lubrication intervals are based on a bearing operating temperature of 75°C (frames 63 to 200) and 85°C (frames
225 to 500). Some designs may vary. An increase of the ambient temperature will raise the bearing temperature
correspondingly. For each 15°C of temperature rise, the relubrication period must be reduced by half (i.e. must
be more frequent).
ATTENTION!
Where motors are mounted inside fan ducts, and where grease re-lubrication points have been mounted on the
exterior of the duct, there will be an additional nameplate affixed to the product which will state the grease type,
quantity and re-lubrication interval.
MOTORS WITHOUT LUBRICATORS
Where motors are not fitted with bearings that can be re-lubricated (WEG 80-132 frames or Brook 71-180 frames), then the
following steps must be taken::
Motors operating in ambient temperatures up to 50°C;
After 20,000 hours running, or 3 years, whichever is the shorter, (10,000 hours where motor speed exceeds 1800 rpm),
the motor should be dismantled, shaft seals and bearings replaced and the bearings re-lubricated.
Motors mounted in airstream, operating at temperatures of 200°C (i.e. motors designed for smoke extraction use);
To re-lubricate motors which are mounted in an airstream with a temperature above 199°C (where the motor is designed
for used within a Smoke Extraction fan), the special grease used has a very low fill requirement. These fans, therefore, do not
have re-lubrication facilities. Any old grease must be washed out with a designated solvent. The bearings must be refilled with
grease leaving the housing empty. If a bearing is removed from the rotor, it must be discarded and a new one fitted, using the
approved grease.
10. TESTING (FANS AND CONTROLS)
It is recommended that fire safety systems are tested every 6 months. However, ideally, these tests should be more frequent
(once per month or once every 3 months). This test must review all elements of the system [fans, controls, dampers etc.]
to confirm correct operation.
Note: Fans must only be run for short periods as no thermal overloads are in circuit for emergency condition.
11. LONG TERM RELIABILITY
Maintenance Engineers should consider performing a major refit after fans have been operating for 50,000 hours or if they
have been installed for a period of 10 years. If the condition of the motor winding has been seen to deteriorate during regular
maintenance (as detailed within section 8), then the motor must be replaced. Motors used within Fire Safety fans must NOT be
re-wound. It could potentially be extremely dangerous to refurbish such as motor using a standard motor rewind facility, as these
motors are specially developed for the smoke control application. The new motor must be manufactured in accordance with
current requirements as stated within the EN12101-3 specification.
Guidance on operating times before a re-fit is required can be obtained from Woods Air Movement Limited on receipt of full
operational information, duty cycle, "HT" category, and other nameplate data. To maintain CE / UKCA marking of High Temperature
Fans; motor replacement must be conducted by Woods Air Movement Limited or our nominated service representatives.
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STANDARD VENTILATION FANS
12. SAFETY
WARNING! Only approved, qualified personnel familiar with the assessment of hazards and risks associated
with fans, and with the use of tools and test equipment required to service such fans, should
install, operate and maintain the product.
CAUTION!
If the installer or user is unable to understand the information in this manual, or has any doubt
that a safe and reliable installation, operation and maintenance of the equipment can be assured,
Woods Air Movement or their representative must be contacted for advice.
WARNING! When fans are retained in storage, access by unauthorised persons must be prevented with the
use of guards, barriers or secure premises such that fan impellers which may be rotating do not
present a hazard.
13. INTRODUCTION & PURPOSE - GENERAL
The Aerofoil Axial Flow Fan is a highly efficient air movement product, designed to operate between a temperature range of
-40° to +50°C (-20°C on starting). When operating at low temperatures, ice formation on the fan assembly must be prevented.
Some fans may also have a specification which requires them to operate in a high temperature emergency condition (i.e.
Smoke Extract). This capability will be identified on a special label affixed to the fan casing (see also Paragraph 16.5).
Please refer sections 1 to 11 of this document for specific guidance related to our HT Series Smoke venting equipment.
Each fan assembly has been manufactured to specifically to fulfil the requirement of the installation for which it was designed.
No deviation from the original requirement must be implemented without referring to Woods Air Movement head office
(located in Colchester in the UK). Any queries regarding safety or operating problems must be referred to your local Woods Air
Movement Limited office,, sales centre or representative, together with full fan/motor nameplate details. Should a fan failure
occur whilst the product is under warranty, the Woods Air Movement service centre in Colchester must be contacted before
any repair work is undertaken.
If speed control is to be provided by means of a frequency inverter, then please seek drive selection and compatibility
advice from Woods Air Movement.
14. STORAGE & HANDLING
WARNING!
While storing fan assemblies, please ensure that access by unauthorised personnel is prevented by using
guards, barriers or secure premises, so that fan impellers, which may be rotating (wind milling), do not present
a hazard.
If the fan assembly is to be stored; check immediately on receipt that it is as ordered and that it has not been damaged
in transit. Where the fan is delivered in a crate (or similar) the crate must be considered as a protective device only.
The crate must not have other equipment stacked on top of it and it must not be stacked on top of other equipment.
The crate structure must not be used as a lifting aid, unless otherwise indicated.
Where a fan is packed inside a crate, a fork-lift truck or similar must be used to transport the product. The fan must be stored
in a safe, clean, dry, vibration free location. If such storage conditions are not available, the motor anti-condensation heater
(if fitted) should be connected to an appropriate electrical power supply to prevent motor condensation forming, while the
fan should be stored in an appropriate enclosure. Each month, the fan impeller should be given a manual rapid spin to help
prevent grease from hardening and possible bearing brinelling; the impeller must not be in the same angular position after
rotation.
When dismantling the crate to gain access to the fan assembly care must be taken to avoid injury from sharp edges, nails,
staples, splinters, etc. If the fan is to be stored for 12 months or more, then we recommend that the fan is inspected by a
member of the Woods Air Movement service team before commissioning is undertaken.
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