page no. 23 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
2.6.1. Electrical Installation
Checks to ensure electrical safety must be carried out by a
qualified person.
2.6.2. Gas Installation
For new installations, the whole of the gas installation,
including the meter, should be inspected and tested
for soundness and purged in accordance with the
recommendations of IGE/UP/1 (Edition 2) or IGE/UP/2A as
appropriate.
2.6.3. Air Distribution System
The system should be checked to ensure that the
installation work has been carried out in accordance with
the design requirements.
Particular attention should be given to the correct
arrangement of delivery ducts and registers, return air
ducts and grills and general adequacy of return air paths.
For NVS/D units ensure that the duct work is balanced so
that the specified motor running currents are achieved See
section 1.2
2.6.4. Checks before lighting the Air Heater
The following preliminary checks should be made before
lighting the heater(s)
a) Ensure that the ELECTRICAL supply to the heater is
switched OFF.
b) Check that all warm air delivery outlets are open.
c) Check that all external controls are calling for heat.
d) If an MC200 or Powrtrol is being used ensure that the
control is set to winter operation.
2.6.5. Lighting the Air Heater
NOTES: On initial lighting of the heater(s), it may
take some time to purge the internal pipe work
of air.
IMPORTANT: The internal pipe work of the
appliance has been tested for soundness
before leaving the factory. After
establishing the main burners test round
the gas inlet connection using a leak detection fluid.
1. Switch on the electrical supply at the isolator.
2. If the High limit indicator light comes on press the limit
reset switch on the front panel. The Red indicator light will
go out and the ignition sequence will commence. After
a delay of approximately 45 seconds the ignition spark
will be generated and the main gas valves energized. The
burners will then light.
3. If the burners fail to light the control box will complete a
further four ignition attempts. If at the end of five attempts
the burners have still not lit the control box will go to
lockout and the red indicator light, internal and remote
lockout lights will be illuminated. To restart the ignition
sequence depress the illuminated reset button for about
1-2 seconds.
4. SHUT OFF Set the external controls to OFF or MIN.
2.6.6 Adjustments
Nominal
CO2
values are given for guidance in the following
table:
Model
30
60
90
140
Natural Gas G20
High Fire
CO2
%
7.5
7.3
7.9
8.9
Low Fire
CO2
%
3.72
3.1
3.6
3.9
Propane G31
High Fire
CO2
%
7.3
7.9
8.5
8.1
Low Fire
CO2
%
4.1
3.8
3.7
4.1
2.6.6.1. Burner Gas Pressures
This is set for the required heat input before despatch.
In the case of Hi/Lo and Modulating units both high and
low pressures are set. Pressures should be checked in the
following manner.
2.6.6.1.1. Standard On/Off Units
1. Set external controls to ensure that the main burner is
off. Open the side access door. Connect a pressure gauge
to the burner pressure test point on the multifunctional
control.
2. Set external controls so as to turn on the main burner.
Compare the measured burner gas pressure to that
2.6 Commissioning and Testing
