6
08. 05. 17. Leaflet Number 671063
Installation and Maintenance
AXUS AXR High Temperature Axial Fans
Maintenance
Nuaire recommends all products maintained in accordance with
the HVCA “Standard Maintenance Specification for Mechanical
Services in Buildings” - Volume II Ventilating and Air
Conditioning and BS5588 Pt. 12.
Motor Maintenance
On going maintenance
Induction motors, by their very nature require minimal
maintenance. However, a regular regime of inspection is
recommended to ensure minor problems do not escalate into
breakdowns. Typical intervals would be 1000 hours of
operation or 3 months, whichever is the sooner.
Maintenance Checklist
✔
Item
Tick
No visible damage i.e. impeller cracked, fan cowl
bent, foot cracked etc.
No accumulation of dust or fibres on the frame
or around the fan inlet.
No significant corrosion of the lifting lugs/
eyebolts.
No excessive vibration.
No loose fasteners.
Cables and earths are sound.
Sealing of the motor and gland plate in
good condition.
Insulation resistance adequate, imperative this
is checked after prolonged shutdown.
Regreasing of bearings required, 160 frames
and above.
Bearing condition.
Motor must be returned to manufacturer for repair.
Because the unit is certified to EN12101-3 and complying with
the construction products directive, the motor must be
returned to the motor manufacturer for replacement.
Enquiries
Please contact Nuaire Limited for information on any aspects
of the motor performance that may need clarification.
Tel: 02920
858
400
Contact must be made prior to any remedial action being taken
under guarantee.
Please quote the motor serial number in all such cases with
detailed description of the problem.
Policy
Our policy is one of continuous technical improvement and we
reserve the right to alter any detail of our product at any time
without prior notice.
Warranty
The 3 year warranty starts from the day of delivery and
includes parts and labour for the first year. The remaining
2 years covers replacement parts only.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or
not installed, commissioned and maintained in accordance with
the details contained in this manual and general good practice.
Specific Commissioning and
Service Requirements
Motors for Smoke Extract Fans
These motors are used to provide a SAFETY FUNCTION for
people in the event of fire in public premises, they are therefore
subject to strict constraints concerning their operating and
maintenance.
Operating Constraints
i.
Check on the nameplate that the selected motor
corresponds to the maximum exposure temperature and
duration.
ii.
AFTER THE MOTOR HAS BEEN SUBJECTED TO ONE
EMERGENCY DUTY OPERATION, IT MUST BE REPLACED.
iii.
With variable speed control. Ensure that the maximum
speed never exceeds the speed of the motor supplied by
the mains and that the delivered power corresponds to the
previous definitions. The motor should be equipped with
PTC thermistors connected to the protection system
during day to day (S1 duty) and switched off during S2
duty (operation during an emergency).
Maintenance Constraints
Regular service visits must be performed on the installation
and EVERY 6 MONTHS, completing the following checks:
i. Checking the insulation resistance
a) If the drain holes are blocked, open them to eliminate
any accumulated condensation.
ii. Condition of motor
a) Ensure there is no dust and grease e.g. motor, housing
fins, motor cover/fan if fitted driven fan.
b) Ensure the motor runs normally when switched on for
a few minutes.
iii. Bearing check
Run the motor during each maintenance visit. When the
motor is cold, a high level of noise is caused by the texture
of the grease. This does not indicate a bearing fault.
a) Permanently greased bearings.
Replace on 2 pole motors after 10,000 hours of operation
and on motors with 4 poles or more after 20,000hours.
b) Re-greaseable bearings
The information on the motor nameplates must be strictly
respected (grease quantity, grease quality and re-greasing
frequency). The bearings must be replaced after 20,000
hours of operation.
Note: Any maintenance, repair or bearing replacement on the
motor must only be undertaken by the motor manufacturer in
accordance with the requirements of the construction products
directive of Ref. 89/106/EEC.
The product warranty applies to the UK mainland and in
accordance with Clause 14 of our Conditions of Sale.
Customers purchasing from outside of the UK should contact
Nuaire International Sales office for further details.