Nordair Niche DH2 150, Инструкция по установке, наладке и обслуживанию, Страница: 2 / 26

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The installation of the Nordair direct gas
fired air heater must be in accordance
with the relevant requirements of the
current Gas Safety (Installation and Use)
Regulations, building Regulations and
the IEE Wiring Regulations.
It should also be in accordance with any
relevant requirements of the local suppli-
er of gas, Local Authority and the rele-
vant recommendations of the following
documents:
British standards
EN525:1997
Requirements for non-domestic gas fired
forced convection air heaters for space
heating.
BS6230
Specification for installation of gas fired
forced convection air heaters for
commercial and industrial space heating
of rated input exceeding 60kW (2nd
family gases).
Institution of gas engineers
IGE/UP/1
Soundness testing and purging of
industrial and commercial gas
installations.
IGE/UP/2
Gas installation pipework, boosters and
compressors on industrial and
commercial premises.
Installation of DV/DH direct gas
fired air heaters
Note Only a competent person shall be
allowed to install a DH heater.
DV/DH gas fired air heaters are
manufactured in two configurations, DV
as a vertical unit and DH as a horizontal
unit, both types are suitable for internal
and external installation only.
DV Vertical indoor configuration
The heater should be positioned onto a
prepared flat level concrete base, or a
support steel work frame, with a
minimum 500mm clearance on the non-
access sides, and 1000 clearance on
the access sides.
The unit should be lifted into position
from it’s base using a suitably sized fork
lift truck with the fresh air inlet facing the
outside wall.
The fresh air inlet weather louvre, cowl
etc should be sized at a maximum inlet
velocity of 2.5m3/sec to prevent water
carryover into the heater, with the duct
work tapering to suit the heater fresh air
inlet connection.
For heaters with extended ductwork.
The ductwork should be sized to ensure
that the external static pressure (ESP)
does not exceed the figure stated on the
data badge.
DH Horizontal indoor configuration
The heater is supplied as a single
fan/burner section. It is usual for
horizontal units to be mounted above
floor level, due to the amount of floor
space they would take up, and are
normally positioned onto the roofs of
internal offices/mezzanine areas or into
the building steelwork.
For heaters being installed onto the roof
of offices etc, the roof must be adequate
to take the weight of the heater, and be
adjacent to an outside wall, to allow
fresh air to be ducted to the heater. A
1000mm clearance would be required
on the access side of the heater, and a
minimum 500mm clearance required on
the non-access side and top of the
heater.
For heaters mounted in the roof steel
work, the units can be supported via 6
M12 drop rods through the support
channels situated on the base of the
unit.
The fresh air to the heater should be
ducted through the roof, with a fresh air
inlet sized to achieve inlet velocities of
2.5m/sec. Supply ductwork should be
sized to suit the flange connection on
the distribution head, or for extended
ductwork runs, sized to ensure that the
external static resistance does not
exceed that stated on the Data Badge.
The fan/burner section should be lifted
into position with a suitably sized fork lift
truck, under the base of the heater or
via a crane using straps and spreader
bars
.
DV - Vertical outdoor configuration
The heater is identical to the indoor
configuration except for a control
Installation instructions
cubicle fitted over the electrical
components, and an inlet cowl fitted to
the fresh air inlet.
The heater is supplied as a single
section, overall sizes and weights as
indicated on the arrangement drawing.
The heater should be positioned onto
a prepared flat level concrete base or
support steelwork frame, with a 50mm
clearance from the building wall, and a
clearance on the access and control
panel side as indicated in the
arrangement drawing.
The heater should be lifted into
position with the fresh air inlet cowl
adjacent to the building wall, using a
suitably sized fork lift truck, with the
forks positioned under the base of the
water. or via a crane with lifting straps
slung under the base of the unit and
spreader bars between the straps at
the top of the heater to prevent the
straps from exerting any undue strain
onto the heater frame.
The external ductwork from the heater
into the building must be weatherproof
and form a water tight seal to the top
of the flange of the heater. All
ductwork should be sized to ensure
that the external static resistance
(ESP) does not exceed the figure
stated on the data badge.
DH - Horizontal Outdoor
Configuration.
The heater is identical to the indoor
configuration except for a control
cubicle fitted over the electrical
components, and an inlet cowl fitted to
the fresh air inlet. The heater is
supplied as a single section, overall
sizes and weights as indicated on the
arrangement drawing.
The heater should be positioned onto
a flat level concrete base, or support
steelwork frame, to give a 500mm
clearance to the underside of the
heater from floor level, 500mm
clearance on the non access side and
a clearance on the access side as
indicated in the arrangement drawing.
The heater should be lifted into
position, using a suitable sized fork lift