COMMISSIONING
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B Open the screw plug on the testing nipple for the gas
hook-up pressure and for purging by 2 turns [1].
B Reset the digital pressure gauge to "0".
B Connect the pressure gauge connection tube to the
positive port of the testing nipple [2].
Fig. 85 Measuring the gas supply pressure
B Slowly open the gas valve by pushing on the gas valve
and turning it ¼ rotation in an anticlockwise direction
(Æ fig. 79, page 49). The gas valve is open when it is
in the vertical position.
B Switch on the heating system by pressing the mains
switch [1] of the BC10 basic controller.
B Press and hold the "Chimney sweep" button [3]
(approx. 2 seconds), until the dot in the right-hand
bottom corner of the display [9] appears. See also
table 10, "Flue gas test", page 42.
B After the "Burner" LED [6] has lit up wait for one
minute until the boiler is burning at full load.
B Measure the gas supply pressure and enter it in the
commissioning log book, page 72.
The gas supply pressure must be:
• for natural gas H min. 17 mbar, max. 25 mbar, nominal
supply pressure 20 mbar.
• for LPG min. 30 mbar, max. 50 mbar, nominal supply
pressure 37 mbar.
B Press the "Service" button [4] repeatedly until the
temperature reading is shown in the display.
B Press the "Chimney sweep" button [3] to clear the
reading. Also see table 10, "Flue gas test", page 50.
Fig. 86 BC10 basic controller
B Close the gas valve (Æ fig. 81, page 50).
B Remove the gauge-connection tube and tighten the
screw plug on the testing nipple again.
B Open the gas valve again by pushing on the gas valve
and turning it ¼ rotation in an anticlockwise direction
(Æ fig. 79, page 49).
10.2.7 CHECKING AND ADJUSTING THE GAS/AIR-
RATIO
B Open at least 2 thermostatic radiator valves. Do not
switch on the boiler.
B Push on the control panel to open it (Æ fig. 68,
page 40).
Throughout the measuring operation, keep
the digital pressure gauge in the same
position (horizontal or vertical) in which it
was reset to "0".
6 720 648 726-085.1TD
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1
DANGER: Danger of fatal accident from
explosive fumes.
B Check the testing nipples used for leaks.
B Only use approved leak detection spray
to locate leaks.
NOTE:
B Check the gas supply pipe or contact the
relevant gas utility company if the
required supply pressure is not available.
B If the supply pressure is too high, a gas
pressure regulator must be integrated
upstream of the gas fitting. Contact the
gas utility company.
WARNING:
Damage to the boiler by incorrect
adjustment of the gas/air-ratio.
B Adjust gas/air-ratio ONLY with part load!
B Adjust gas/air-ratio ONLY based on the
gas/air pressure differential and never
based on measured flue gas values such
as CO/CO
2
/NO
x
!
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