2
nuaire.co.uk
029 2085 8400
30. 04. 19. Leaflet Number 671220
Installation and Maintenance
AXUS Circular Long Cased Axial Flow Fans
Figure 3. Resilient Mounting
‘Floor’ fixing.
Figure 4. Resilient Mounting
‘Suspended’ fixing.
Supporting
foot.
Shakeproof
washers.
Fixings by
installer.
Supporting
foot
25mm dia
essential safety
washer for
suspended
applications (four
25mm washers
supplied with
kit), other fixings
by installer.
Drop rods
(by others).
Nuts used
for height
adjustment.
IMPORTANT
AV mounts isolate the fan only. Silencers /
backdraught dampers and other "significant mass"
accessories should form part of the fixed ductwork
after the flexible connection.
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
An inverter is used to provide speed control. When the
fan is isolated, allow 5 minutes for the capacitors in the
inverter to discharge before commencing any work on
the unit.
3.3 Suspended Horizontally or Vertically
A.V. mountings must be arranged so that they are used in compression
only. If Resilient Mountings NAV1 to NAV5 are specified the rubber
mountings must also remain in compression. The large metal washers
must be fitted under the studding nuts on each mounti
ng (fig. 4).
Other types of A.V. mounts - spring etc. are also designed to be
used in compression only.
A suspended steel underframe would be necessary to support the unit,
(by others) standing on A.V. mountings.
3.4 Ecosmart Control Installation (optional)
The controller must be fitted indoors (an optional outdoor cover can be
purchased) and away from water spray and heat source.
The operating range is -10°C to 35°C up to 85% relative humidity.
The controller must be fitted to a vertical vibration free wall with
appropriate fasteners and for ease of installation the cover should be
removed and the casing separated from the base. If cooling fans are
fitted they should be disconnected while installation takes place.
The cable connecting the Ecosmart control and the fan must be a
screened power cable, not exceeding 30 metres.
The screening must be earthed at both ends using the special cable
glands supplied.
Bridge any break in the screening
(e.g. at local isolators)
using braided
earthing strap.
(Details of Ecosmart controls and wiring connections can be found
on pages 4, 5 and 6).
3.5 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 termination box on
all fans, if explosion proof motors are fitted they will require matched
specified wiring; refer to data sheet 671216 for additional advice.
Wiring connection diagrams; where a starter, frequency inverter
or Ecosmart control is used also refer to the relevant control I&M
instructions. Bifurcated fans should only be speed controlled by a
frequency inverter.
It is essential to note that for all three phase fans of 4kW and above 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. If the fan is to be started
direct on line (DOL) to a frequency inverter or Nuaire’s Ecosmart speed
control the motor
must be connected in Delta.
If T1/ T2 are located in the fan terminal block, this is the motor overheat
protection device which uses Thermistors or a Thermostat as specified.
IMPORTANT
For specialist connections not shown always refer to
the wiring diagram supplied with the unit. In the event
of query or uncertainty contact NUAIRE directly before
any connection is made.
