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Turn the burner off; then start it up again. If the adjustment is not correct, repeat the previous steps.
Fully modulating burners
To adjust the fully-modulating burners, use the S3 switch on the burner control panel (see next picture), instead of the TAB thermostat
as described on the previous paragraphs about the progressive burners. Go on adjusting the burner as described before, paying atten-
tion to use the CMF switch intead of TAB.
The S3 position sets the oprating stages: to drive the burner to the high-flame stage, set S3=MAX; to drive it to the low-flame stage, set
S3=MIN.
To move the adjusting cam set S3=MIN or MAX and then S3=MAN.
S3
Minimum oil pressure switch (when provided)
The minimum oil pressure switch on the inlet line, checks that the pressure does not drop below a default value. The pressure switch
must be set, say, at 10% under the pressure at the nozzle.
Maximum oil pressure switch
The oil pressure switch on the return line, checks that the pressure does not exceed a default value. This value must not be higher
than the maximum acceptable pressure on the return line (this value is reported on the specification table). A pressure change on the
return line could affect the combustion parameters: for this reason, the pressure switch must be set, say, at 20% over the pressure
recorded during the combustion adjustment. The factory setting is 4 bar.
It is recommended to verify that the combustion parameters are within the range of acceptable values even against a pressure varia-
tion that gets close to the limit of the pressure switch
This check should be carried out along the whole range of the burner output.
In case of inacceptable values, reduce from 20% to 15% the overpressure; later on, repeat the adjustments described above.
Oil pressure switch adjustment
Follow the below instruction, according to the pressure switch installed.
A
C
NB: Remove lockplate (C) before adjustment
B
A - Range (Stop pressure)
B - Differential
Danfoss KP..
S3 = MAN stop at the current position
S3 = MAX high flame operation
S3 = MIN low flame operation
S3 = AUTO automatic operation
HEX6
HEX6
31
PART III: OPERATION
Trafag Picostat 9B4..
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