37
Adjusting procedure
To change the burner setting during the testing in the plant, follows the next procedure, according to the burner operation.
DUNGS MB-DLE gas valves group:
Before starting the burner up, adjust the valves group slow opening: to set the slow opening
remove cover
T
, reverse it upside down and use it as a toolto rotate screw
VR
. Decrease the ignition flow rate by screwing, increase it
by unscrewing. Do not use a screwdriver on the screw
VR
!
Note: the screw
VSB
must be removed only in case of replacemente of the coil (see picture).
.
Go on adjusting air and gas flow rates: check, continuosly, the flue gas analisys, as to avoid combustion with little air; dose the air
according to the gas flow rate change following the steps quoted below;
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
from the boiler/utilisation:
-
Multibloc MB-DLE:
the valve is adjusted by means of the
RP
regulator after slackening the locking screw
VB
by a number of
turns. By unscrewing the regulator
RP
the valve opens, screwing the valve closes. The pressure stabilizer is adjusted by operating
the screw
VS
located under the cover
C
. By screwing down the pressure is increased and by unscrewing it is reduced.
Note:
the
screw
VSB
must be removed only in case of replacemente of the coil.
Pressure stabiliser is factory-set. The setting values must be locally adapted to machine conditions. Important! Follow the instruc-
tions carefully!
Now adjust the pressure switches (see next par.).
C
VS T(VR)
RP
VB
VSB
C
VS
T(VR)
RP
VB
VSB
Dungs Multibloc MB-DLE