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Operational Gas Inlet Pressure
1
Key
1 Set point
• With all other gas appliances operating, check the
operational supply pressure at the gas valve test point.
The nominal supply pressure for Natural Gas (G20) is 20mbar.
The nominal supply pressure for LPG (G31) is 37mbar.
• Turn the taps and appliances off, then disconnect the
pressure gauge.
Additionally the safe nominal heat input of the appliance can be
achieved at an inlet pressure down to 15mbar.
The burner pressure cannot be measured and is not
used to measure the gas rate.
Gas Rate
• Make sure that all other gas burning appliances are off.
• Check the gas rate using the gas meter test dial and stop
watch, at least 10 minutes after the burner has lit, see table
below for approximate rates. To set max rate refer to section
16.1.2.
Gas rates (G20)
Gas rates (G31)
(approx) after 10 mins from cold
Model
MIN
MAX
MIN
MAX
m
3
/h
ft
3
/h
m
3
/h
ft
3
/h
kg/h
kg/h
24
0.882
31.2
1.936
68.4
0.580
1.32
28
0.989
34.9
2.482
87.7
0.703
1.78
1m
3
Propane - 1.87kg
In communal or LPG installations where the gas rate cannot be
measured it is acceptable to measure the combustion rate as
described in section 18.2.3.
• On completion, press the "reset" button with a blunt
instrument to reset the boiler.
11.7 Testing heating system
• Ensure that the external controls and programmer are calling
for heat.
• Fully open all radiator valves, see chapter "Appliance
installation
►
Recommendations before installing
►
Heating
circuit design".
• Activate the C.H. function on the appliance's control panel.
• Balance the radiators as required to give the required system
differential.
• Turn off all radiators that can be shut off by the user and
check to see if less than the maximum differential allowed of
20°C can be achieved across fl ow and return.
Should the appliance require adjustment refer to the
"Specifi c adjustment" section overleaf.
• Allow the system to reach maximum temperature then switch
off the boiler by isolating from the electrical supply.
• Drain the entire system rapidly whilst hot, using the drain
taps at all the low points of the system. Fill and vent the
system as described previously in chapter "Commissioning
► Filling the CH system (Central heating)".
• Adjust the boiler temperature controls and any system
controls to their required settings.
11.8 Testing domestic hot water system
• Open a hot-water tap.
• Check that the temperature obtained is compliant with the
setting on the appliance
.
11.9 Completion
• Ensure that the magnetic operating instruction label is placed
on the surface of the boiler casing.
GB: It is a requirement that the “Benchmark” Installation,
Commissioning and Service Record is completed and left with
the user.
IE: it is necessary to complete a “Declaration of Conformity” to
indicate compliance to I.S.813. An example of this is given in
the current edition of I.S.813.
