NuAire AXUS AX Series Installation And Maintenance Manual

1.0 Introduction

The AXUS range of axial flow fans are designed for 'in duct'
applications. Manufactured from galvanised steel, the units are
suitable for indoor or outdoor installation and at any installed
angle.
Available for single and three phase supplies.
Case diameters of 250mm to 2400mm.
Unit codes AX25 to AX240.
Impellers have been selected at blade angle settings matched to
various motor speeds to perform against the design criteria laid down
in our selection catalogue.
Any attempt to adjust or reset impeller blade angles will invalidate
Warranty.
For full unit description, dimensional, weight and performance details
refer to the Nuaire product catalogue. A comprehensive range of
ancillaries and silencers are also listed.

2.0 Handling

The fan impeller is carefully balanced and centralised in the fan case,
it is therefore essential that great care is exercised when handling the
unit. Check the weight on the rating plate details before attempting to
lift and always use a spreader as shown (fig. 1), never pass lifting slings
through the impeller (fig. 2).
Figure 1. Correct method of
lifting using a spreader.
nuaire.co.uk 029 2085 8400
AXUS AX
Circular Long Cased Axial Flow Fans
Installation and Maintenance
Figure 2. The wrong method of
lifting with sling through impeller
can cause case distortion.

3.0 Installation And General Advice

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 e.g. IEE,
CIBSE, HVCA, ATEX, BSI & EN standards etc.
If the fan is to be installed in a potentially explosive atmosphere it will
have been designed to ATEX directive 2014/34/EU and will incorporate
motors requiring compatible installation wiring direct to the motor
termination box, to complete this installation also follow the guidance
advice of data sheet 671216.
Before commencing installation check that all materials, including
optional ancillaries are available to complete the installation. Every unit
is tested and serialised at works and a test certificate produced, the
details recorded on the fan side rating plate should also be referred to
before handling and installation.
Any damages or deviations should be immediately reported to the
seller/supplier/agent quoting the order and product details from
the product rating plate.

3.1 Mechanical Installation

Rotate the fan impeller by hand to ensure free and smooth rotation and
that no transit or handling damage has occurred, observe the direction
of flow/direction of rotation arrow and ensure that:
All optional accessories such as support brackets, attenuators,
•
inlet cones, guards, flexible connectors etc. are assembled to
the fan.
The optional support brackets are correctly fitted, at any
•
position around the circumference, but suit the installation
plane.
External termination box is accessible to the electrician.
•
When offering the fan to the ducted system that both inlet
•
and outlet connections are perfectly aligned.
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.

3.2 Horizontal on Floor or Supported from Wall etc.

Optional resilient mountings should be attached to the unit mounting
brackets at this stage (fig. 3). If the unit is supported from a wall,
supporting brackets should be used. Position and align the unit with the
ductwork in both horizontal and vertical planes and pack height under
mounting feet if necessary.
Matching attenuators if required; should be fitted to the fan with any
other accessories before installation.
Matching flanges are fixed to the ductwork ends with rivets.
30. 04. 19. Leaflet Number 671220
The EMC Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
1