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MCA 15 - MCA 25 MCA 25/28 MI
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A
B
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5.5
Checks and adjustments after commissioning
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TEMP.: 68°
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AUTO
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5"
29/04/2010 - 300022146-001-B
T001985-A
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SUNDAY 11:45
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STD
C002235-F-04
5.4.4.
Basic setting for the gas/air ratio
If the gas/air ratio is out of adjustment, the gas valve unit has a basic
setting. To do this, proceed as follows:
1. Switch off the boiler electrical power supply.
2. Close the gas valve on the boiler.
3. Remove the air inlet flue on the venturi.
4. Unscrew the top connection on the gas valve unit.
5. Disconnect the connector located under the fan.
6. Release the 2 clips holding the fan/mixing elbow unit in place on
the heat exchanger.
7. Completely remove the fan/mixing elbow unit.
¼ For steps 3 to 7 inclusive, see chapter: "Checking the burner
and cleaning the heat exchanger", page 105
8. Turn the setting screw A on the gas valve unit to modify the
position of the flow regulation valve.
9. Turn the setting screw B on the gas valve unit anticlockwise until
it matches the front panel.
10.Turn the setting screw B on the gas valve unit by 6 turns clockwise.
11.Follow the procedure in reverse to re-assemble all of the
components.
5.5.1.
Displaying the parameters in extended
mode
The display mode on the control panel is set as standard in such a
way as only to show the "conventional" parameters. It is possible to
switch to "extended" mode by proceeding as follows:
1. Access the "installer" level: Press key - for around 5 seconds.
2. Select the menu #SYSTEM.
Turn the rotary button to scroll through the menus or
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modify a value.
Press the rotary button to access the menu selected
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or confirm a value modification.
¼ For a detailed explanation of menu browsing, refer
to the chapter: "Browsing in the menus", page 62
3. Set the parameter INSTALLATION to EXTENDED.
5. Start-up
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