page no. 21 of 44
NVx Range Users, Installation & Servicing Instructions issue 6.4 Aug 2017.
2.1.1 Fitting space requirement
For NVx/D units the normal air flow direction is from right
to left when viewing the heater from the burner/controls
end with the fan unit upstream.
The minimum clearances must be observed for installation
and servicing.
Any combustible material adjacent to the air heater and
the flue system must be so placed or shielded as to ensure
that its temperature does not exceed 65 °C.
When NVx modular components are used in conjunction
with the heater each component must be individually
supported.
Note: The access door to the controls section
may be removed to improve access. Open the
door to 90°, remove the earth cable at the
bottom, and then lift the door vertically
upwards to disengage the hinge plates. Refit in reverse
order. Ensure that the earth cable is refitted.
2.1.2 Suspending the heater
The air heater may be installed either:
a) suspended from suitable vertical drop rods.
b) on specifically designed cantilever brackets from a non
combustible wall.
c) on a level noncombustible surface. The surface must not
extend past the front edge of NVx/F heaters.
The method of installation must be capable of adequately
supporting the weight of the unit (See section 1.2) and
any ancillary equipment. Before installing the heater the
existing structure must be inspected to ensure it is suitable.
All supports should be protected against the effects of rust
or corrosion.
Raise the heater up to the point of installation using
suitable and safe means and connect to the means of
suspension.
Note: Each heater is provided with additional
central suspension points (suspension points
running along the front and back are for
permanent connection, suspension points
running left to right in the centre are for temparary
support) that can be used to provide temporary support,
using suitable means, whilst the unit is being installed.
Under no circumstances must these points be used as the
final means of suspension.
Threaded drop rods must have lock nuts fitted that are
tightened down onto the 10mm fixings in the heater. If
reducing noise levels is important the heater should be
insulated from the structure by installing it on suitable
anti-vibration mountings. In all such cases and when the
heater is suspended it is essential that all gas, duct, and
electrical connections to the heater are made with flexible
connections to maintain continuity of connection.
2.1.3 Air Distribution System
2.1.3.1 General
NVx/D and NVx/C models are designed for use with duct
work to more precisely define the point of air delivery,
and /or provide ducted return air or ducted fresh air inlet.
All ducting must be independently supported of the air
heater.
Joints and seams of supply ducts and joints between NVx
ancillary components must be securely fastened and made
airtight using appropriate sealants or sealing strips. If
required the duct work should be insulated to reduce heat
loss.
2.1.3.2 Noise Reduction
Ducting should be connected to the heater spigots via
an airtight flexible coupling of noncombustible material.
Before fitting the coupling it must be ensured that a
minimum clearance of approximately 15mm will be
maintained between the ends of the ducting and the
heater spigots.
Sound attenuators may be fitted in inlet and outlet ducts
to reduce airborne fan noise. Materials used in outlet
sound attenuators must be capable of withstanding 100°C
air temperature without any deterioration.
2.1.4 Room Thermostat Siting
The room thermostat should be fitted at a point which
will be generally representative of the heated area as
far as temperature is concerned. Draughty areas, areas
subjected to direct heat e.g. from the sun, and areas where
the air movement is relatively stagnant e.g. in recesses,
should be avoided. The thermostat should be mounted
approximately 1.5m from the floor.
Any room thermostat, frost thermostat, time clock etc.
must be suitable for switching 230V, 5A and must be of the
'snap action' type to minimise contact bounce.
For electrical connections of external controls see section
2.5 or the accompanying wiring diagram.
