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50 Doc890/3456CV02B
Measure the gas pressure at the supply side of the gas valve. This must be at least 18 or 35 mbar
(for natural gas) with the boiler operating at full capacity. When multiple appliances are installed
in the boiler room, this pressure must be measured with all the appliances operating at full capac-
ity.
Check the temperature difference (∆T) between the fl ow and return to the appliance at the water
side. ∆T must be between 15 and 25 K at full capacity.
Check the appliance at minimum capacity
Adjust the appliance to operate at minimum capacity. At mini mum capacity the following settings
must be checked and corrected if necessary:
Pilot burner CO
2
[%] 10.2 ± 0.2
Pilot burner CO [ppm] ≤ 1000
Main burner CO
2
[%] 9.3 ± 0.2
Main burner CO [ppm] ≤ 30
Burner pressure p
fan
– p
above burner
[mbar] 0.7 ± 0.1
Propane
Pilot burner CO
2
[%] 11.0 - 11.4
Pilot burner CO [ppm] ≤ 1000
Main burner CO
2
[%] 10.8 - 11.2
Main burner CO [ppm] ≤ 30
Burner pressure p
fan
– p
above burner
[mbar] 0.7 ± 0.1
Table 16 Settings at minimum capacity
Setting air pressure switch: 0,4 ± 0,05 mbar
Check the function ∆P
min
pressure switch by carefully placing a board (for example, a piece of
strong cardboard) in front of the supply opening to the fan and slowly slide the board so as to
close off the opening until the boiler shuts down.
If the appliance is checked in the manner indicated, and cor rected as necessary, the following
pressures, at full capacity, must be recorded for reference on the commissioning report note:
P
vent
P
bb
P
vent
-P
bb
(measure separately!)
P
vh
∆T
8 Maintenance
8.1 Safety
During maintenance activities, always wear suitable clothing and shoes. Consider your own
safety, particularly in respect of jewellery and loose clothing.
8.2 General
In order to ensure continued good and safe operation of the appliance, this must be inspected at
least once per year.
47


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