Checking And Adjusting The Gas/Air Ratio - Buderus logamax plus gb142-24 Installation Manual

9 Start-up procedure
Measure the gas connection pressure as soon as the
"Burner" LED lights and enter this value in the start-up
report.
The inlet gas pressure must be:
– for natural gas - min. 3.5 to 10.5 inch W.C (8.7 to
26.1 mbar), nominal supply pressure 7.0 inch W.C.
(17,4 mbar)
– for LPG - min. 8.0 to 13.0 inch W.C. (19.9 to 32.3 mbar),
nominal supply pressure 11.0 inch W.C. (27.4 mbar).
Repeatedly press the "Service"
temperature indication is displayed.
Press the "Chimney Sweep"
measurement procedure.
Close the gas shut-off valve.
Remove the connection hose again and tighten the
screw plug on the testing nipple.
Open the gas shut-off valve again.
CAUTION
– Contact the relevant gas utility company if the
required inlet gas pressure is not available.
– Install a gas pressure regulator before the
gas burner fitting if the supply pressure is too
high.
9.8

Checking and adjusting the gas/air ratio

Switch off the heating system using the main switch.
Loosen the screw plug on the measuring nipple for the
burner pressure by two rotations (fig. 36, pos. 1).
Set the pressure gauge to zero.
Use a hose to connect the plus terminal of the pressure
gauge to the burner pressure measuring nipple (fig. 36,
pos. 2).
Switch on the heating system using the main switch.
Buderus • http://www.buderus.net
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button until the
d
button to end the
Installation instructions Logamax plus GB142-24/30/45/60 • version 10/2007
Fig. 36 Checking the gas/air ratio
We reserve the right to make any changes due to technical modifications!
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