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Leaflet Number 671409 February 2009
Installation and Maintenance
AXUS SVT2 High Temperature Impulse Axial Fans
Specific Commissioning and
Servicing Requirements
Motors for Smoke Extract Fans
Exposure temperature/time: 300
o
C for 120 minutes.
These motors are used to provide a SAFETY FUNCTION for
people in the event of fire in public premises or in the home:
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. Non ventilated motors MUST be placed in the airflow from
the driven fan. Ventilated motors can be placed outside the
flow.
iii.
AFTER THE MOTOR HAS BEEN SUBJECTED TO ONE
EMERGENCY DUTY OPERATION, IT MUST BE REPLACED.
iv. 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.
These qualifications ensure the qualification of the driven
fan by the manufacturer.
Maintenance Constraints
Regular service visits must be performed on the
installation at least every 6 months, incorporating
the following checks:
i. Checking the insulation resistance
(R>100MOhms, 500V DC)
a) If the drain holes are blocked, open them to eliminate any
accumulated condensation.
b) If R<100MOhms, dry the stator in an oven and check
the insulation
resistance. If the fault persists, replace the stator.
c) The stator must be replaced 5 years after installation or
after 20,000 hours of operation.
ii. Cooling check
a) Ensure there is no dust or grease in the entire ventilation
circuit (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 (C3 or C4 play)
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.
S2 duty only:
The bearings must be replaced by an identical type every
5 years. Ensure the motor runs normally when switched on
for a few minutes.
S1 duty and Emergency in S2 duty:
a) Permanently greased bearings.
300
o
C range; 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.
Replacement of parts
When ordering spares it is important to state the unit serial
number to ensure that the correct spares will be supplied.
Notes - Fixing bolts, nuts, studs, screws, spacers or washers
are not included with these parts and if required, should be
clearly specified on the order in addition to the part description
number.
Warranty
The three year warranty starts from the day of delivery and
includes parts and labour for the first year. The labour element
is subject to full, free and safe access to the equipment as
recommended by the CDM regulations.
The remaining two years covers replacement parts only.
Note: Installation and maintenance of the equipment must be
undertaken as directed in the instructions provided with the
unit.
Enquiries
Please contact Nuaire Limited for information on any aspects
of the motor performance that may need clarification. Contact
must be made prior to any remedial action being taken under
the warranty.
Please quote the motor serial number in all such cases with
detailed description of the problem.
Service Enquiries
Our service department will be happy to provide any assistance
or further information required. If you have any comments or
queries on any of our products or services please write to the
Product Information Manager at the main address on page one
of this document.
Customer Services Department
Tel: 02920 858 585
Fax: 02920 858 586
Technical or commercial considerations may, from time to time, make it necessary to alter the design, performance and
dimensions of equipment and the right is reserved to make such changes without prior notice.
