Fully Modulating Burners; Calibration Of Air Pressure Switch - Unigas RG515 Manual Of Installation - Use - Maintenance

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.
CMF
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 = 0 stop at current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
VR
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