GAS TYPE CONVERSION
: Gas type conversion from LPG to natural gas or from natural gas toLPG
must be carried out only by qualified person.
- Gas type conversion can be divided in 3 sections: gas pressure adjustments, replacement of the
burner injectors and jumper adjusment.
Gas Pressure Adjustments
The operating pressure varies depending on the type of gas. Therefore, minumum and maximum
operating gas pressure must be set by means of the adjusment screws that are on top of the gas
valve. The heat output directly depends on the operating pressure. When the operating gas pressure
range is adjusted, minimum and maximum heat output is also adjusted (mechanically).
Table 19
24 kW Models 28 kW Models
Max. operating gas pressure (mbar)
11,2
11,3
Natural Gas
Min. operating gas pressure (mbar)
1,3
1,2
Max. operating gas pressure (mbar)
28 / 35
28 / 35
LPG
Min. operating gas pressure (mbar)
3,3 / 4,1
3,4 / 4,2
- Firstly, operate the boiler at maximum load while adjusting maximum operating pressure and
operate the boiler at minimum load while adjusting minumum operating pressure.
- Undo the 2 screws which are located on the lower edge to remove the front panel.
- Undo the 2 screws which are located on the corners of the control panel.
- Pull the control panel outwards to reach the gas valve.
¨
Maximum operating pressure adjustment:
- Operate the boiler at maximum load.
- Connect the tube of a clocking gas meter to outlet pressure tap whose diameter is
φ
=9 mm
(fig. 19) after loosening the tap’s screw.
- Remove cap screw from maximum pressure regulator to expose pressure regulator adjusment
screw which is seen as (2) in fig. 19.
- Turn the adjustment screw clockwise to increase or counter-clockwise to decrease gas flow to the
burner.
- Check gas pressure measurements on the gas meter to satisfy the desired value.
In LPG operation, the adjustment screw (2) is tightened to the end for 28 / 35 supply
pressure.
¨
Minimum operating pressure adjustment:
- Operate the boiler at minimum load.
- Connect the tube of a clocking gas meter to the outlet pressure tap.
- Turn the adjustment screw which is seen as (1) in fig. 19 counter-clockwise to increase or
clockwise to decrease gas flow to the burner.
- Check gas pressure measurements on the gas meter to satisfy the desired value.
- Ensure that the tap’s screw is tightened after making the adjustments.
- Replace pressure regulator cap screw.
- Reassemble the front panel and the control panel.
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