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).
- 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
=9 mm
after loosening the tap’s screw.
(fig. 22)
- Remove cap screw from maximum pressure regulator to expose pressure regulator adjusment screw
which is seen as (2) in fig. 22.
- 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. 22
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.
27
Table 7
Proteus Plus 23,3 kW
Natural Gas
Max. operating gas pressure (mbar)
11,9
Min. operating gas pressure (mbar)
1,4
LPG
Max. operating gas pressure (mbar)
28
Min. operating gas pressure (mbar)
3,6