Checking And Adjusting The Gas/Air Ratio; Carrying Out A Tightness Test In Operating Conditions; Measuring The Co Content - Buderus Condensing gas boiler Instructions Manual

3.5 Checking and adjusting the gas/air
ratio
B Switch off the boiler using the main switch.
B Loosen the screw plug on the measuring nipple for the
burner pressure by 2 rotations (Æ fig. 18 [1]).
B Set the pressure gauge to 0.
B Use a hose to connect the plus terminal of the pressure
gauge to the burner pressure measuring nipple
(Æ fig. 18, [2]).
Fig. 18 Checking the gas/air ratio
B Switch on the boiler using the main switch.
B Press the "Chimney Sweep" d button and hold it for
approx. 2 seconds until the display shows the decimal
point.
B Press and hold the "Chimney Sweep" d and "Service"
e button, for approx. 5 seconds, until the display
shows .<D(e. g. .<D).
B Set the boiler to partial load (ÆTab. 3).
altitude Display setting
ft. (m) GB162-80 kW
0-4,000 ft.
.<D
(0-1,220)
4,000-10,200
.<D
(01,220-10,200)
Tab. 3 Partial load set.
B Pressing the "Chimney Sweep" d button for higher
values or the "Reset" c button for lower values.
B Read out the differential pressure.
The differential pressure (p
-0.04" W.C. (-10 Pa) (±0.02 " W.C. = ± 5 Pa)
(read-out on pressure gauge:
-0.06 – -0.02" W.C. = -15 – -5 Pa).
B Enter the value measured in the start-up report.
Logamax plus GB162-80 kW/100 kW - We reserve the right to make any changes due to technical modifications!
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6720615033-019.1TD
Display setting
GB162-100 kW
.<D
.<D
– p ) must be
Gas Air
Liquid Propane conversion
B Adjust the gas/air ratio, if not correct, using the
adjustment screw (Æ fig. 19, [1]). The adjustment
screw is located behind the cover screw.
Fig. 19 Setting the gas/air ratio
B Press repeatedly the "Service" e button until the
temperature indication is displayed.
B Press the "Chimney Sweep" d button until the
decimal point is cleared from the display.
B Switch off the boiler using the main switch.
B Remove the measurement set-up, tighten the screw in
the burner pressure measuring nipple.
B Switch on the boiler using the main switch.
3.6 Carrying out a tightness test in
operating conditions
CAUTION:
due to a short circuit.
B Cover damageable parts before leak
testing.
B Do not spray the leak detection agent onto
cables, plugs or electrical connection
lines. Do not allow it to drip onto them
either.
B Check all gaskets and joints in the burner gas circuit for
leaks while the burner is operational, using a leak
detection agent.
3.7

Measuring the CO content

B Measure the CO content on the flue gas sampling
point (Æ fig. 20, [1]).
The CO values in an air-free condition must be below
400 ppm or 0.04 vol. %.
Values of 400 ppm and up indicate that the burner
adjustment may be wrong, the gas burner fitting or the
heat exchanger are dirty or that there may be burner faults.
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