page no. 32 of 44
NVx Range Users, Installation & Servicing Instructions issue 6.4 Aug 2017.
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 NVx/D and NVx/C 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 limit indicator light comes on press the limit
thermostat interlock relay reset switch on the inside
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
Model
15
20
25
30
40
50
60
75
SF90
SF120 SF140
Natural Gas G20
High Fire CO2
%
6.7
8.1
8.8
9.0
8.9
8.1
7.8
8.7
7.5
8.2
8.0
FGT (nominal)
°C
146
187
191
177
188
194
199
202
151
158
157
Low Fire CO2
%
2.8
3.9
4.7
3.5
4.8
3.8
3.4
4.4
3.9
4.8
4.9
FGT (nominal)
°C
80.0
79.7
80.0
80.3
80.3
79.0
78.8
79.2
81.4
83.0
82.8
Propane G31
High Fire CO2
%
6.6
9.71
10.0
9.3
9.6
9.6
9.95
10.4
8.5
10.1
8.0
FGT (nominal)
°C
137
172
171
179
183
178
168
185
156
160
159
Low Fire CO2
%
2.78
3.97
4.82
3.6
4.2
3.9
3.66
4.4
4.4
5.82
5.2
FGT (nominal)
°C
83.0
120.0
122.0
117.0
130.0
117.0
113.0
116.0
94.0
103.0
95.0
2.6 Commissioning and Testing
