02/2011 - Art. Nr. 4200 1027 9501B
16
Commissioning
Setting the MB-ZRDLE gas train
General adjustment procedure
The 2
nd
stage can only be adjusted via
the pressure regulator Set the 2
nd
stage
valve (button
C
) to fully open.
The incremental advance setting on
ignition and on switching stages is
performed using button
B
.
The 1
st
stage setting is performed using
ring
D
.
Adjusting the regulator:
The pressure in the regulator is
measured at
pBr
.
The set pressure supplies the required
flow rate.
Incremental advance setting on
ignition
This hydraulic function affects the gas
valve opening characteristics during
ignition and when switching stages.
• Unscrew plastic cap
B
.
• Turn it around and use it as a key.
• Turn in the direction of:
arrow to -:
the incremental advance
increases
arrow to +:
the incremental advance
decreases
Setting the 2
nd
stage using the
adjusting knob C.
This operation is only required when the
burner power is too high with a pressure
of 5 mbar between the valves, or when
the burner is tending to pulse.
Proceed as follows:
• Unscrew the locking screw without
touching the painted screw on the
other side. The cap
C
is turned 4.5
times.
• Rotate clockwise
arrow to -:
the flow
is reduced, and vice-versa.
The pressure may need to be corrected.
Adjusting the flow of the 1
st
stage
By hand (not tool).
• Reduce gas throughput by turning ring
D
clockwise (located on the lower
section of the solenoid coil). Turn anti-
clockwise to increase gas throughput.
(there is a difference of 3 whole turns
between the minimum and the
maximum).
Note
Adjusting the gas throughput for the 2
nd
stage may also alter the throughput for
the 1st stage. If this is the case, the 1
st
stage must be readjusted.
• Afterwards, retighten the locking
screw.
Adjusting screw of the
gas pressure
regulator
Locking screw
Sealed screw
Combustion
Control
ltd
