5.4 Gas settings
5.4.1. Adapting to another gas type
WARNING
Only a qualified engineer may carry out the following
operations.
The boiler is preset in the factory to operate on natural gas H (G20).
For operation on another group of gases, carry out the following
operations.
In case of functioning on propane:
1.
Boiler type
For conversion to propane
MCA 45 Rotate the adjusting screw A on the venturi 4¾ turns in a
clockwise direction
MCA 65 Rotate the adjusting screw A on the venturi 6½ turns in a
clockwise direction
MCA 90 Fit the gas restrictor in the gas block
MCA 115 First turn the setting screw A clockwise until it is closed, then:
Rotate the adjusting screw A on the gas block 3,5- 4 turns in
an anticlockwise direction
2. Regulate the fan speed as indicated in the table (if required):
¼
See chapter: "Professional settings", page 79
3. Set the air/gas ratio. For more detailed information on this subject,
see the following paragraphs:
¼
"Setting the air/gas ratio (Full load)", page 65
¼
"Setting the air/gas ratio (Part load)", page 66
5. Commissioning - DIEMATIC iSystem MCA 45 - 65 - 90 - 115
64
28/08/12 - 300024827-001-01
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