5
nuaire.co.uk
029 2085 8400
21. 10. 19. Leaflet Number 671798
Installation and Maintenance
AXUS Circular Short Cased Axial Flow Fans
Impeller Retaining Bolt Settings
Bolt Size
Torque Setting (Nm)
M4
3
M5
6
M6
10
M8
24
M10
49
M12
85
M16
210
M20
300
Table 3: Torque settings for impeller retaining bolts.
IMPORTANT
Tip to casing clearence must be even around the whole of the case.
7.1 Points of Caution
•
The centre bolt may be tight initially due to the presence of Loctite.
•
Having removed the centre bolt and washer, spray the hub centre with
WD40, whilst avoiding the bearing area.
•
Support the impeller until it is fully removed, ensuring that weight does not
bear on a partial area of the hub.
•
Should the impeller bind part way, apply WD40 and ease back on. Then
attempt again to remove the impeller fully. Never drive off the impeller as
this may cause damage to the impeller and motor bearings.
•
Take care not to damage or distort the fan blades, These may be of thin
section possibly leading to severe imbalance during operation.
•
Clean drive shaft thoroughly before attempting to re-fit the impeller.
•
Should difficulty be experienced when re-fitting the impeller, attempt to
fit with the key removed and check that the key fits in the hub separately.
Note- the key must be fitted prior to powered operation.
•
When the impeller is fitted, check for any free play in the hub, any of free
play may cause imbalance during operation. Should free play be found,
contact the manufacturer for assistance.
•
Never force the impeller onto the shaft.
8.0 EXTENDED STORAGE
General advice is as follows:
Fan products designed for environmental ventilation of
a completed structure must not be used during site construction or the ‘clean-
up’ period. Cement and plaster dust is extremely abrasive and can advance
bearing wear.
Where fans are to be put in to service for commissioning they must be protected
from the airborne contaminants prevalent under construction site conditions.
Where fans are to be put in to ‘normal’ service in a completed or part
completed building the end user, tenant, occupier etc. must be informed of the
maintenance requirements detailed in the relevant product installation and
maintenance documents.
Where fans are to be stored or bonded for extensive periods either in warehouse,
under site conditions or in the installed state we make the following additional
recommendations;Motors should be stored at ambient temperatures between -
16°C and +50°C and at relative humidity (RH) below 90% RH.
•
Turn fan and motor shafts at three monthly intervals to prevent
the brinelling effect on the bearings. Brinelling is a flattening or
settlement of the shaft in the bearing housing.
For extensive storage periods and particularly where the motors may be exposed
to high RH levels, special precautions and restart requirements may be required.
For further advice contact the Nuaire technical help line below.
9.0 WARRANTY
This product comes with a 1 year warranty. The warranty starts from the day of
delivery and includes parts and labour for the first year.
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.
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.
10.0 AFTER SALES
For technical assistance or further product information, including spare parts and
replacement components, please contact the After Sales Department.
Tel: 02920 858 400
Impeller Tip to Case Minimum Clearance
Case Diameter (mm)
Minimum Tip Clearance (mm)
250
1
315
2
350
2
400
2
450
2
500
2
560
2
630
2
710
2.5
800
3
900
3.5
1000
4
1120
5
1250
6
Table 2: Minimum tip clearences.
