Adjustment could be needed after commissioning the roaster, or when you are changing gas type.
Be aware that you need a new burnerbed as well when you are changing the type of gas.
Make sure you are adjusting this type of valve.
The first step is to loosen the screw (marked with the blue arrow pic.1) inside the point where you connect the manometer (Ca. 2 sweeps counter-clockwise).
After this is done connect your Manometer to this point (see picture 1).
Remove the rubber-cover(marked with the red arrow pic.2) from the connection that you can see in picture 2(marked with the Yellow Arrow pic 2.), there are two imbus bolts inside this connection, there is one bigger imbus bolt this is you low load and one smaller imbus bolt this is your High load.
Start of by turning the Low load Counter-clockwise until you feel some resistance, if you feel resistance you have to immediately stop turning, if not you risk damaging the adjustment screw.
Now it is time to start the burner, make sure it is set to 100% (or Auto) and it is advisable to put the tryer between the bean release door to keep the door open. this will suck in extra cold air so that the machine doesn't heat up that quickly, that buys you extra time to adjust the valve before the roaster starts to modulate.
Now you can start adjusting your gas valve by turning the High load Imbus bolt, using the small allen key.
If you turn it to the right the burner pressure will increase, turn it to the left and the burner pressure will decrease.
Follow the values in the schedule that you can see below.
Burnerpressure highload W6:
Propane: 17,4 mBar
Natural: 9,5 mBar
Butane: 13,0 mBar
Burnerpressure highload W15:
Propane: 26 mBar
Natural: 10 mBar
Butane: 18,0 mBar