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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
attention 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.
AUTO
MAN.
Adjusting the gas valves group
Multibloc MB-DLE
The multibloc unit is a compact unit consisting of two valves, gas pressure switch, pres-
sure stabilizer and gas filter.
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. To set the fast opening remove cover T, reverse it upside down and use it as a tool
to rotate screw VR. Clockwise rotation reduces start flow rate, anticlockwise rotation incre-
ases it.
Do not use a screwdriver on the screw VR!
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.
Key
1 Electrical connection for valves
2 Operation display (optional)
3 Pressure governor closing tap
4 Start setting cap
5 Hydraulic brake and rate regulator
6 Coil
7 Test point connection G 1/8
8 Test point connection G 1/8 downstream of valve 1, on both sides
S3
MAX
MAN stop at the current position
MAX high flame operation
MIN low flame operation
AUTO automatic operation
MIN
Fig. 5
9
Output flange
10 Test point connection M4 downstream of valve 2
11 Gas flow direction
12 Test connection G 1/8 downstream of valve 1, on both sides
13 Vent nozzle pressure regulator
14 Filter (below cover)
15 Input flange
17 Pressure switch
18 Pressure switch electric connection
31
PART III: OPERATION
C
VS T(VR)
RP
VB
Fig. 6
VSB
Fig. 4
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