Glow-worm Flexicom cx - Manual (Page 27)

0020107232_03 - 12/14 - Glow-worm
INSTALLATION
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DO NOT operate the boiler without water.
Check that all external controls are calling for heat.
Set the Central Heating temperature and the Domestic Hot
Water temperature to ON by pressing the MODE button
on the User Interface until it shows the appropriate symbol
°C
bar
or
°C
bar
and then pressing the - (minus) SELECTOR button.
The lighting procedure of the boiler is fully automated.
The digital display, refer to diagram 12.2, will show water
temperature in central heating demand.
● The appliance will enter a self checking routine then the
fan should start and the ignition will commence.
The boiler, if necessary, will automatically repeat the
ignition sequence a further 4 times.
● If the burner fails to ignite “F1” will be displayed, initially,
this may be due to air in the gas supply line.
● Once the system has been purged of air. Set the hot water
to the desired temperature by using the MODE and +
(plus) SELECTOR buttons.
Open a hot water tap, the diverter valve motor will move to
hot water supply and the display will read domestic hot water
temperature.
Check that hot water is available at all taps, then close.
● Set the Central heating water temperature to the desired
temperature by using the MODE and + (plus) SELECTOR
buttons.
The appliance will then continue to operate in central heating
until the user controls are satisfied or there is another demand
made for hot water.
11.7 Check the Gas Inlet Pressure & Gas
Rate
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
fluid, purge as necessary.
NOTE: 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.
After a period of 10 minutes, with the boiler operating in C.H.
mode, turn on several hot water taps, this will operate the boiler
at maximum rate.
Operational Gas Inlet Pressure
With ALL other gas appliances operating, check the operational
supply pressure at the gas service isolation valve test point, see
diagram 11.1.
The nominal supply pressure for Natural Gas (G20) is 20mbar.
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.
NOTE: 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 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.
The approximate maximum gas rates are:
24cx : 1.9m3/h (68ft/3/h)
30cx : 2.6m3/h (92ft/3/h)
35cx : 3.3m3/h (115ft/3/h)
Diagram 11.2
14507
MODE
MODE
kW m3/hr ft3/hr kW m3/hr ft3/hr
20 2.1 74.2
30 3.2 113 19 2.0 70.6
29 3.1 109.5 18 1.9 67.1
28 3.0 106 17 1.8 63.6
27 2.9 102.4 16 1.7 60.0
26 2.8 98.9 15 1.6 56.5
25 2.6 91.8 14 1.5 53.0
24 2.5 88.3 13 1.4 49.5
23 2.4 84.8 12 1.3 45.9
22 2.3 81.2 11 1.2 42.4
21 2.2 77.7 10 1.1 38.9