NuAire QUIETWINS QTI, Installation And Maintenance Manual, Page: 1 / 12

NuAire Limited
Western Industrial Estate
Caerphilly, United Kingdom CF83 1XH
Telephone: 029 2088 5911
Facsimile: 029 2088 7033
Email: info@nuaire.co.uk
www.nuaire.co.uk
Leaflet 670916
DECEMBER 2001
QTI QUIETWINS
Direct Drive Twinfans
single phase
Introduction
The NuAire QUIETWIN Twinfan Direct Drive range consists
of 4 basic designs with duties up to a maximum of 1.53m
3 /s.
The 4 models are coded as follows:
QTI (Internal Duct Mounted) in line unit.
QTE (External Duct Mounted) in line unit
QTR (Roof Mounted, end inlet) side discharge unit.
QTRB (Roof Mounted bottom inlet) side discharge unit.
QTI Quietwin
Units are rectangular in section and have circular rigid spigots at
each end (QTIC). Matching acoustic flexible connectors are
included and four matching mounting feet are alsosupplied.
The casing is manufactured from coated galvanised steel. Full
size access panels are fitted to the top and bottom faces. These
panels are fully detachable for inspection purposes. The internal
surfaces of the case (including the top and bottom panels) are
lined with a fire retardant acoustic lining material. The units
incorporate two independent motors with high efficiency, for-
ward curved centrifugal impellers running in metal scrolls. The
fans discharge into a common outlet chamber through a shutter
system that prevents ‘blowback through the standby fan.
The motors are manufactured to BS 5000 and are suitable for
single phase supply. Airflow and failure monitors are standard as
is Class B insulation. Suitable for operation in ambient tempera-
tures up to 40
o C.
Controls
The fans are designed to be used with SMART (S) controls .
Installation
I MPORTANT
The installation must be carried out by qualified personnel
in accordance with the appropriate authority and con-
forming to all statutory and governing regulations eg. IEE,
COHSE etc.
QTI units are supplied for installation into In-Line ductwork
(internal) applications. The mounting feet on the QTI unit
can be employed in surface or suspended applications.
ISOLATION
Before commencing work ensure the electrical supply is
disconnected.
Installation Ancillaries
Anti vibration mountings and matching silencers are available
Units should always be positioned with sufficient space to
allow removal of the access covers and subsequent
removal of fan and motor assemblies etc.
Quietwin QTI units can be mounted in any attitude
except vertical with the outlet facing down, or inverted
i.e. upside down as these attitudes the shutters will not
operate satisfactorily.
Ductwork connections must be airtight to prevent loss of per-
formance. The method of mounting used is the total responsi-
bility of the installer. The QTI unit has an external case side
mounted control module / terminal box and is supplied ready
for connection into the electrical supply.
Rigid Mounting
Note, the QTI unit and silencer cases have captive M8 nuts
which can be used after removing the M8 screws plugging
them.
On Resilient Mountings
Suspension rods / fixing screws are not supplied. Drill suitable
holes in the support structure to receive the particular sizes.
Note that the large round washers included in the resilient
mounting kits are for fitting above or below the resilient
mounting as required to safeguard the installation against
break-up of, or damage to, a mounting. In the event of a
resilient mounting failure the washer will support the weight
of the unit.
Suspended from ceiling
Large washers should be fitted BELOW the resilient mounts.
Installation
and Maintenance
Contents Page
Introduction 1
Installation 1
Dimensions 2
Electrical information
2
AV mountings 3
Silencers 3
Controls wiring connections 4
Commissioning the fans 5
Maintenance 8
Certification
9
Warranty 12
1
Fig. 1. General view of a typical QTI unit.
Unit must NOT be
installed with the outlet
facing downward Unit must NOT be
installed inverted
(upside down)
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