Unigas K890A, Manual Of Installation - Use - Maintenance

Page: 32 / 133

PART III: OPERATION
32
1 .the first parameter will be “954”: the percentage of flame is shown on the right. By pr or - it is possible to scroll up/down the
parameter list.
2 Once the last parameter is accessed (143) by pressing + , the End message will blink.
3 PressPress InFo for more than three seconds or for more than three seconds orto return to the normal display.
For further nformation, see tha LMV2 related manual.
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.
ADJUSTMENTS FOR GAS OPERATION
Air flow and gas adjustment

startup the burner by selecting GAS by means of the switch on the burner control panel

Adjust the air and gas flow rates, in according to the “air/gas ratio” curvepoints setting procedure on the LMV manual,. Check con-
tinuosly, the flue gas analisys, to avoid combustion with air excess.

Once the butterfly valve is completely opened, acting on the pressure stabiliser of the valves group, adjust the gas flow rate in the
high flame stage as to meet the values requested by the boiler/utilisation:

If necessary, change the combusiton head positionl.

The air and gas flow rate are now adjusted at the maximum power stage: go on with the point to point adjustement, as to reach the
minimum output

Adjust the pressure switches
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
CMF