Checking And Adjusting The Gas/Air Ratio - Buderus Logamax plus GB162-80 kW Replacement Instructions Manual

3
Gas valve replacement
1
Fig. 13 Measuring the gas supply pressure
B Briefly press on the control panel cover to open it.
Fig. 14 Opening the control panel
B Switch on the heating system by setting the main
switch to position "1" (
B Press the "Chimney Sweep"
approx. two seconds) until the display shows a decimal
point.
B Measure the gas connection pressure as soon as the
"Burner" LED lights and enter this value in the start-up
report.
1)
Statically measured gas supply pressure must be:
• for natural gas - min. 5.0 to 10.5 inch W.C. (12.4 to
26.1 mbar), nominal supply pressure 8.0 inch W.C.
(19.9 mbar)
B Repeatedly press the "Service"
temperature indication is displayed.
B Press the "Chimney Sweep"
measurement procedure.
B Close the gas shut-off valve.
B Remove the connection hose again and tighten the
screw plug on the testing nipple.
B Open the gas shut-off valve again.
1) Measured statically perpendicular to flow at full load.
8 Logamax plus GB162-80 kW/100 kW - We reserve the right to make any changes due to technical modifications!
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fig. 1, page 5).
button and hold it (for
button until the
button to end the
B Contact the relevant gas utility company if
the required inlet gas pressure is not
available.
B Install a gas pressure regulator before the
gas burner fitting if the supply pressure is
too high.
3.3 Checking and adjusting the gas/air
ratio
B Switch off the heating system using the main switch.
B Loosen the screw plug on the measuring nipple for the
burner pressure by two rotations (
B Set the pressure gauge to zero.
B Use a hose to connect the plus terminal of the pressure
gauge to the burner pressure measuring nipple
( fig. 15, [2]).
Fig. 15 Checking the gas/air ratio
B Switch on the heating system using the main switch.
B Press the "Chimney Sweep"
approx. two seconds) until the display shows the
decimal point.
B Press and hold the "Chimney Sweep"
"Service" buttons (for approx. five seconds) until
the display shows "Lxx" (e. g. L80).
B Set the boiler to partial load "L25" for the 80 kW and
"L20" for the 100 kW boiler by pressing the "Chimney
Sweep" button (higher values) or the "Reset"
button (lower values).
B Read out the differential pressure.
The differential pressure (pGas – pAir) must be
-0.02 inch W.C. (- 5 Pa) (±0.02 inch W.C. = ± 5 Pa)
(read-out on pressure gauge: -0.04 – 0 inch W.C. =
-10 – 0 Pa).
B Enter the value measured in the start-up report.
fig. 15, [1]).
1
2
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button and hold it (for
and