0020167175_01 - 02/13 - Glow-worm
11.7 Gas rates
The supply from the governed meter must be of adequate size to
provide a steady inlet working pressure of 20mbar (8in wg) at the
boiler.
• On completion, test the gas installation for tightness using the
pressure drop method and suitable leak detection fl uid, purge
in accordance with the above standard.
i
IMPORTANT:
Due to the modulating operation of the boiler and the
need to check the gas inlet pressure and measure the
gas rate at maximum rate, it will be necessary to force it
to maximum.
• Activate the test mode "P.01" and set the value to HI in order to
force the burner at P. max. See chapter "Specifi c adjustment >
Appliance technical settings and parameter list > Test modes".
11.7.1 Operational Gas Inlet Pressure
1
2
Key
1 Gas service isolation valve
2 Test point
• With all other gas appliances operating, check the operational
supply pressure at the gas service isolation 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 maximum heat input of the
appliance can be achieved at an inlet pressure down to 15mbar.
i
IMPORTANT:
The burner pressure cannot be measured and is not used
to measure the gas rate.
11.7.2 Gas Rate
• Make sure that all other gas burning appliances and pilot
lights 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.
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
30 0.65 22.9 3.24 114.4 0.47 1.94
35 0.92 32.5 3.77 133.1 0.67 2.37
In communal or LPG installations where the gas rate cannot be
measured it is acceptable to measure the combustion rate as
described in the servicing section.
• On completion, press the "reset" button to reset the boiler.
• Gas rates for both central heating and hot water can be verifi ed
using the test program P.03 and P.01 respectively.
11.8 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
diff erential.
• Turn off all radiators that can be shut off by the user and check
to see if less than the maximum diff erential allowed of 20°C
can be achieved across fl ow and return.
i
IMPORTANT:
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.
INSTALLATION
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