Service Handbook OGS/OGB
6.25 Readjusting the Gas valves
6.25.1 Safety advice and Information
i
Information:
After replacing the gas valve, the unit must be adjusted to the required exhaust
gas values according to these instructions.
The unit is provided with a 100% premixed blower burner. This is why a
conventional adjustment of the burner pressure is not possible. The unit is
adjusted via the installation of the gas panels and the adjustment of the gas
valve and adapted to the existing gas type and gas pressure. By minimum and
maximum blower speed, the allowed CO
2
value must be maintained.
The unit can be adjusted for the following gas types
(Gas data for 15°C and 1013 mbar):
Gas type Wobbe index Heat value Burner value
Recommended
connection
flow pressure
Wi Ws Hi Hi Hs Hs
mbar MJ/m3 MJ/m3 MJ/
m3
MJ/
kg
MJ/
m3
MJ/
kg
Natural gas (E)
G20
17-25 45,7 (36,8 to 49,6) 50,7 (40,9 to 54,7) 34,0 -- 37,8 --
Natural gas (LL)
G25
18-30 37,4 (30,9 to 40,5) 41,5 (34,4 to 44,8) 29,3 -- 32,5 --
Liquid gas G30
(Butan)
25-57,5 80,6 (68,1 to 80,6) 87,3 (88,5 to 87,3) 116,1 45,7 125,8 49,5
Liquid gas G31
(Propan)
25-57,5 70,7 (68,1 to 80,6) 76,8 (88,5 to 87,3) 88,0 46,4 95,7 50,4
The values on the Wobbe index can be obtained from your local gas supplier.
Safety:
Page 1 / 12
Before adjusting the gas valve, read through the entire instructions and
absolutely adhere to the sequence of steps.
Each
step explanation is to be carried out carefully.
Each outside and inside connection of the unit is to be checked for sealed
tightness before operating the unit (Gas detector or leakage spray).
Necessary tools:
Gas exhaust measuring instrument
(with CO- and CO
2
-Sensor)
Screwdriver average
Torx wrench TX25 and TX40
AS/11-2011 / Part No.: 7016396 6_25e_Readjusting the Gas valves_d
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