Vaillant ecoMAX 646 Installation And Maintenance Manual - page 21
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Installation and maintenance manual ecoMAX 646 / 0020020158_02
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2
Fig. 5.3 Measuring the connection pressure
Caution!
Natural gas:
If the connection pressure lies outside the range
from 15 to 23 mbar, you must ensure that the
recommended pressure loss from the meter to
the appliance is not exceeded.
Liquid gas:
If the connection pressure is less than 32 or
greater than 42 mbar, you must ensure that the
gas supply is correctly sized and has no more
than the recommended pressure loss from the
supply to 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) back on.
• Open the appliance‘s gas stop cock.
• Check that the seal plug is re-fitted correctly and test-
ed for leaks.
• 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.
• Check that the seal plug is fit tight.
• Put the front casing back on.
Do not start up the appliance!
5.2.3 Checking
the
CO
2
content and adjusting it if
needed (air ratio setting)
Note!
Checking/adjustment of this value is required
in the following instances: replacement of gas
valve, conversion to or from Natural Gas/ LPG
or if incorrect combustion is suspected!
• Remove the case from the unit.
• Activate full gas rate mode by simultaneously press-
ing the ”+” and ”–” buttons on the display system
• Wait at least five minutes, or until the unit has reached
its operating temperature.
• Measure the level of CO
2
content at the exhaust–fume
test outlet (3) (Fig. 5.4). Check the reading against the
corresponding value in tab. 5.2.
• If the exhaust–fume setting requires adjustment, re-
move the screw (4) and swivel the air suction pipe (5)
forwards through 90° (Fig. 5.4). DO NOT remove the
air suction pipe.
• Adjust the corresponding setting as required by turn-
ing the screw (6) (fig. 5.4).
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4
5
6
Fig. 5.4 Carrying out a CO
2
measurement, carrying out an air
ratio setting (gas setting)
Initial start up and commissioning 5