page no. 11 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
1.3.3 Electrical Supply
Wiring external to the air heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply.
All standard heaters are supplied by 230V - 1ph, 50Hz. The
method of connection to the main electricity supply must:-
- facilitate the complete electrical isolation of the unit(s)
- be in a readily accessible position adjacent to the unit(s)
- serve only the unit(s)
- have a contact separation of at least 3mm in all poles. See
the accompanying wiring diagram for the heater electrical
connections
NVS/C and fan/silencer units can also be supplied for 400V
3N, 50Hz.
1.3.4 Gas Supply
A servicing valve and union to facilitate servicing must
be fitted to the gas inlet pipe work of the heater. The gas
supply must be completed in solid pipe work and be
adequately supported. Heaters suspended by drop rods,
straps or chains must have a flexible connection as the
final link between the gas supply pipe work and the heater.
Sufficient slack must be left in the connection to take
account of normal movement of the heater.
Warning
When completing the final gas connection
to the heater do not place undue strain on
the gas pipe work of the heater.
1.3.4.1 Service Pipes
The local gas undertaking should be consulted at the
installation planning stage in order to establish the
availability of an adequate supply of gas. An existing
service pipe must not be used without prior consultation
with the local gas undertaking. The inlet gas pressure
under running conditions must not be less than 17.5mb.
1.3.4.2 Meters
An existing meter should be checked, preferably by the gas
undertaking, to ensure that the meter is adequate to deal
with the total rate of gas supply required by all connected
equipment.
1.3.4.3. Installation Pipes
Installation pipes should be fitted in accordance with IGE/
UP/2. Pipe work from the meter to the air heater must be
of adequate size. Do not use pipes of a smaller size than
the inlet gas connection of the heater. The complete
installation must be tested for soundness as described in
the above Code.
1.3.5 Flue System
NVS units feature a closed combustion circuit and have an
internal exhaust fan, mounted downstream of the heat
exchanger, to evacuate the products of combustion and
draw in air for combustion.
The air heater must be connected to the flue system that is
provided by Powrmatic Ltd. Several configurations of flue
and combustion air ducts are available.
The flue must terminate in a freely exposed position and
be sited to prevent the products of combustion entering
any opening in a building in such concentration as to be
prejudicial to health or a nuisance
Type B22 Installation.
Type C32 Installation.
Combustion
ai r
socke t
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
