Unigas R91A, Руководство по установке, использованию и обслуживанию

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C.I.B. UNIGAS
- M039231CB
27
Adjusting procedure
If the burner is provided with the DUNGS MBC..SE gas valves group, set the pressure regulator to 1/3 of its stroke, using a 2.5 allen
key.
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go on adjusting the burner, observing the procedure on the LMV2.. related manual.
By following the “fuel/air ratio” curvepoints setting procedure on the LMV2.. manual, adjusting the air and gas flow rates: check, conti-
nuosly, 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 governor of the valves group, adjust the gas flow rate in the high flame stage as to meet the values requested
by the boiler/utilisation:
- Siemens VGD valves group: remove cap T and act on the VR adjusting screw to increase or decrease the pressure and consequen-
tly the gas rate; screwind VR the rate increases, unscrewing it decreases (see next figure).
- Dungs MBC..SE valves group: act on its pressure governor to increase or decrease the pressure and consequently the gas rate.
Now adjust the pressure switches (see next par.).
Fully modulating burners
To adjust the fully-modulating burners, use the CMF switch on the burner control panel (see Fig. 16), 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 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. To move the adjusting cam set CMF=1 or 2 and then CMF=0.
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
As far as fully-modulating burners, see the Siemens RWF40.. manual.
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Pressure setting
VR
T
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Siemens VGD..
Dungs MBC..SE