Unigas K990A, Installation Manual

Page: 32 / 112

PART III: OPERATION
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set the required percentage and confirm by pressing ENTER; press ESC to exit.
choose “Autom/Manual/Off
three modes are provided:
Automatic : automatic operation
Burner on : manual operation
Burner off: burner in stand-by
If the BurnerOn mode is choosen,the burner does not follow the modulator and probe settings, but operates at the set load.
For further details, see the LMV5x annexed manuals.
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
SetLoad
Curr::
0.0%
New: 20.0%
SetLoad
Autom/Manual/Off
Autom/Manual/Off
Curr::
Automatic
New: Burner On
Caution : if BurnerOff mode is selected, the burner stays in stand-by.
Caution : in the BurnerOn mode, the safety thresholds are set by the Technical Service.