Checking The Co Content And Adjusting It If Needed (Air Ratio Setting) - Vaillant ecoMAX 665 Installation And Maintenance Manual

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Fig. 5.3 Measuring the connection pressure
Caution!
If the connection pressure lies outside the
range from 17 to 25 mbar, you mustn't make a
setting or start up the appliance.
If the connection pressure lies within the permissible
range, proceed as follows:
• Put the appliance out of operation.
• Close the appliance's gas stop cock.
• Remove the pressure gauge and screw the seal plug
(1, fig. 5.3) back on with the auxiliary tool supplied.
• Open the appliance's gas stop cock.
• Check that the seal plug is fit tight.
• Put the front casing back on and start the appliance
up again.
If the connection pressure does not lie within the per-
missible range and you can't correct the error, notify the
gas supplier. Proceed as follows:
• Put the appliance out of operation.
• Close the appliance's gas stop cock.
• Remove the pressure gauge and screw the seal plug
(1, fig. 5.3) back on with the auxiliary tool supplied.
• Check that the seal plug is fit tight.
• Put the front casing back on.
Do not start up the appliance!
Installation and maintenance manual ecoMAX 665
Putting the device into service 5
5.2.3 Checking the CO
needed (air ratio setting)
• Take off the appliance casing.
• Activate test program P.1:
• Press "Mains ON" or press the reset key.
• Now press the "+" key until P.0 appears in the display
(approx. 5 s).
• Then press the "+" key once. The display shows P.1.
• The test program P.1 is started by pressing the "i" key.
The appliance then runs for 15 minutes at full power.
• Wait at least 5 minutes until the appliance reaches
operating temperature.
• Measure the CO 2 content at the flue gas test nozzle
(3) (fig. 5.4). Compare the value measured with the
corresponding value in table 5.2.
• If a setting of the flue gas value is necessary, unscrew
the screw (4) and move the air intake pipe (5) forward
by 90°.
Do not remove the air intake pipe!
• If necessary, set the corresponding flue gas value (table
5.2) by turning the screw (6).
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Fig. 5.4 Carrying out a CO 2 measurement, carrying out an air
ratio setting (gas setting)
content and adjusting it if
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