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Fully modulating burners
To adjust the fully-modulating burners, use the
CMF
switch on the burner control panel (see next picture), instead of the
TAB
thermo-
stat as described on the previous paragraphs about the progressive burners. Go on adjusting the burner as described before, paying
attention to use the CMF switch intead of
TAB
.
The
CMF
position sets the oprating stages: to drive the burner to the high-flame stage, set CMF=1; to drive it to the low-flame stage, set
CMF=2.
To move the adjusting cam set CMF=1 and then CMF=0. For further information about the regulating modulator, see the attached
manual.
Calibration of air pressure switch (when provided)
To calibrate the air pressure switch, proceed as follows:
Remove the transparent plastic cap.
Once air and gas setting have been accomplished, startup the burner.
During the pre-purge phase o the operation, turn slowly the adjusting ring nut
VR
in the clockwise direction until the burner lockout,
then read the value on the pressure switch scale and set it to a value reduced by 15%.
Repeat the ignition cycle of the burner and check it runs properly.
Refit the transparent plastic cover on the pressure switch.
CMF
CMF = 0 stop at current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
VR
