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nuaire.co.uk
029 2085 8400
21. 10. 19. Leaflet Number 671798
The EMC Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
AXUS - SC
Short Cased Axial Flow Fans
Installation and Maintenance
1.0 INTRODUCTION
The Nuaire Short Cased Axial Fan range is produced in a range of sizes from
250mm to 1600mm diameter.
Cases are manufactured from various materials such as pre-galvanised steel,
stainless steel or hot dipped galvanised steel. Impellers are selected to meet
the specific performance and are available in a variety of materials to ensure
suitability for the application.
Units are available for single and three phase supply.
2.0 HANDLING AND STORAGE
The fan impeller is carefully balanced prior to despatch and great care must
be exercised when handling the unit.
This will ensure that the case is not damaged or distorted, causing the impeller
to foul against the casing. The fan should be stored on a flat surface and the
impeller rotated at regular intervals.
3.0 INSTALLATION
Installation must be carried out by competent personnel in accordance with
good industry practice, the appropriate authority and in conformance with
all statutory and governing regulations.
Prior to installation the impeller should be rotated by hand to ensure free and
smooth rotation and that no transit or handling damage has occurred.
Ensure that impeller and motor are free from obstruction and that all optional
accessories such as guards and bell mouths are securely fastened before
commencing unit start up.
When operating at low temperatures, ice formation can occur, and suitable
prevention should be adopted to avoid ice build up.
Suitable heater jackets are advised that cover the entire circumference of the
impeller area. Blocking or partial blocking of guard areas must be avoided to
prevent uneven airflow through the ventilator.
In order to ensure performance is as stated, a minimum distance of twice the fan
diameter is required between the appliance and any bends in the ductwork.
Figure 1. Correct method of
lifting/removing from a pallet.
Figure 2. Moving/positioning unit
to application using a spreader.
IMPORTANT
Any damages or deviations should be immediately reported to Nuaire
quoting the order/Arc number and product details, detailed on the
product rating label.
3.1 Mechanical Loading
Units are not designed to support the weight of any other structure or
equipment, and should not be subject to mechanical loading or vibration
levels beyond that associated with their application. This condition includes
the support of ducting, attenuators and other connected ancillary items unless
specifically provided for (Note: connection points may be provided, but this does
not imply the provision for mechanical support).
3.2 Unit Modification
Physical modification of any kind without published instruction or prior
engineering approval may compromise unit operation and safety and will
automatically invalidate the product warranty.
3.3 Drain Plugs
Motors are supplied with 2 (two) drain holes. Located at drive end and non-drive
end of the motor.
Nuaire recommend that the drain holes are plugged to suit the fan mounting
application, these drain plugs when changed should be
fitted with a torque
setting of 10Nm.
Motors are fitted with drain plugs to prevent the build up of condensation. The
type & orientation of these drain plugs is covered further in section 3.12 and 3.13.
3.4 Coil Applications and Obstruction to Airflow
The minimum recommended distance from any installation obstruction to the
inlet or outlet plane of the fan is 1 (one) fan diameter.
If any permanent or temporary obstruction is present within this distance,
or otherwise at greater distance and results in either a non-uniform flow
distribution to or from the fan, or a variable flow quantity, the operational and
structural integrity of the fan may be severely compromised.
In such cases, it is the responsibility of the system designer to ensure that no
detrimental effect is encountered and Nuaire will accept no liability for product
failure.
3.5 Motors
Supplied as standard are motors that are enclosure protection certified to IP56
standards.
This certification allows for the following conditions:
Water delivery rate: 105 l/minute maximum
Water pressure: 1 bar maximum (assuming 12.5mm plain nozzle)
Duration: 3 minutes
Distance to motor: 3m minimum
Maximum water temperature: 40°C
Wash down cleaning of the ventilator should be with water only as no cleaning
fluids or additives are permitted.
Should a specification exceed these requirements, alternative enclosure
protection levels can be advised on request.
All bearings are pre-packed with grease and sealed for life requiring no further
lubrication.
3.6 Connection Details
Electrical connections are made directly to the motor terminal box as standard.
Check that the voltage on the fan rating label is suitable for your supply. Full
load and starting currents are also indicated.
Motors below 4kW are designed for Direct On Line starting whilst 4kW and
above are suitable for Direct On Line or Star/Delta starting.
