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Boilers with a double gas valve: SCB 150 and 180 kW
- Converting from Nat. gas to LPG:
1. Disconnect electrically the left hand gas valve, by separating the white plug and contra plug of the
left hand gas valve.
2. Turn the small "throttle" (see page 29) screw 2 (on the right hand gas valve) clockwise about 4 half
turns.
3. Press the service switch (with a ball pen).
4. The appliance should start, if there is no ignition, open the throttle 2 (anti - clockwise) about a half
turn.
5. Turn the red control knob on the control panel to the maximum -the speed of the fan will go to
maximum: the colour of the flame should be blue, if yellow, give a little less gas (throttle clockwise,
or when the flame disappears, anti- clockwise).
6. When the flame has the right colour: place the analyser in the measuring hole of the tube - not
before, otherwise you could get too much CO in the analyser.
7. Set the screw 2 to obtain a reading of about 100 ppm CO. CO² % is not important it will be around
9,5 %.
8. Turn the red control knob on the control panel to the left to about 9 O’clock .
9. Set the screw 2 to obtain about 50 ppm CO.
10. Turn the red wheel to the minimum.
11. Set the screw 1 to give a CO value less than 10 ppm.
12. Turn the red control knob on the control panel to maximum, reset (if required ) the CO at less than
100 ppm with help of the Throttle screw.
Setting after replacing the right hand gas valve:
1. Open the throttle screw (anti - clockwise) completely; then turn the screw 8 half turns clock wise.
2. Press the service switch (with a pen) .
Commission the valves as per the commissioning instructions above starting at no 3
Conclusion
Set the Boiler on CO emission
Setting LPG CO² % is not important, because it is influenced by the quality of the
LPG, which differs quite a lot; mostly the measured CO² % is about between 9,5 and
10%) High Fire CO: less than 100 ppm Low Fire CO less than 10 ppm.
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