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nuaire.co.uk
029 2085 8400
21. 10. 19. Leaflet Number 671798
Installation and Maintenance
AXUS Circular Short Cased Axial Flow Fans
3.13 Horizontal Mounting
With horizontal mounted axial fans (Figure 6).
•
Both drain holes should be fitted with standard (non-capillary) drain plugs
(Figure 5).
•
Nuaire recommends that the additional underside plastic drain plugs (not
shown) are removed at service periods to allow condensation to drain.
These should not be removed during process working or clean down
periods.
4.0 ELECTRICAL INSTALLATION
Units are not supplied with electrical isolators, their selection and provision is
the responsibility of the installer.
Ensure the electrical supply is suitable for the fan and that all wiring, fuse and
overload protection etc. is appropriately sized by comparing with the rating
plate.
Electrical connection is made direct to the motor terminal box.
For D.O.L starting of 4kW and above, 3ph, the final connection must be in
DELTA. If a STAR/DELTA starter is to be used connect all six motor terminals
to the appropriate terminals of the starter.
3.7 Start Up Procedure
On start up ensure the impeller rotation follows the arrow indicator on the fan
casing. Should the direction be incorrect on a three phase unit reverse any two of
the supply leads.
Single phase rotational direction is set at the factory and should not be altered.
Equipment should be run for approximately 30 minutes to ensure correct
operation.
If any fault occurs the equipment should be switched off and not re-started until
the fault has been rectified.
3.8 Reversing Fans
If the unit is specified as ‘reversing fan’ care must be taken when designing the
control gear to ensure that enough time is allowed for the fan impeller to come
to a standstill before switching to the opposite rotation.
3.9 Windmilling
Care must be taken to ensure that reverse windmilling does not occur prior to
start up. This condition can cause damage to impellers & motors, which may
shorten service life or lead to failure.
3.10 Starting and Stopping
The control system shall be engineered to prevent more than 10 stop / start
operations in any 1 hour period.
Where it is not possible to arrange this under automatic control, the minimum
acceptable provision is to make this limiting factor clear in the Operation Manual
for the building services system or Plant within which our Products are fitted.
3.11 Guarding
A guarding arrangement appropriate to the application must be determined by
the System Designer, using a risk assessment based approach.
The guarding system selected must prevent operator contact with moving or
otherwise hazardous parts, but must also provide containment in the eventuality
of structural failure.
Provision for containment guarding must in any case be provided for overhead
unit mounting, and is also required for installations that may encounter periodic
ice build-up and / or occasional contact of solid bodies with rotating parts.
3.12 Vertical Mounting
With vertically mounted axial fans (Figure 3).
•
The drain hole positioned at the lowest part on the motor (A) should be
fitted with a capillary drain plug (Figure 4).
•
The drain hole that is positioned at the highest point on the motor (B)
should be fitted with a standard (non-capillary) drain plug (Figure 5).
IMPORTANT
For good EMC engineering practice, any sensor cables or switched live
cables should not be placed within 50mm of other cables or on the same
metal cable tray as other cables.
IMPORTANT
If motor overheat protection is specified, terminals T1 and T2 must be
connected to the fan control circuit.
Failure to do so will invalidate the warranty.
Figure 3. Vertical mounted axial fans.
Figure 4. Capillary drain plug.
Figure 5. Non-capillary drain plug.
Figure 6. Horizontal mounted axial fans.
