Checking And Adjusting The Gas/Air-Ratio - Worcester GB162-65 Installation And Servicing Instruction

COMMISSIONING
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".
Throughout the measuring operation, keep
the digital pressure gauge in the same
position (horizontal or vertical) in which it
was reset to "0".
B Connect the pressure gauge connection tube to the
positive port of the testing nipple [2].
1
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
( 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.
52
B Press the "Chimney sweep" button [3] to clear the
reading. Also see table 10, "Flue gas test", page 50.
Fig. 86
6 720 648 726-085.1TD
B Close the gas valve (
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
(
10.2.7 CHECKING AND ADJUSTING THE GAS/AIR-
B Open at least 2 thermostatic radiator valves. Do not
switch on the boiler.
B Push on the control panel to open it (
page 40).
9
10
888
11
2 3
1
1
BC10 basic controller
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.
fig. 81, page 50).
fig. 79, page 49).
RATIO
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 /NO !
2 x
6 720 648 726 (2011/07)
8
4 5
7
6
6 720 648 726-069.1TD
fig. 68,