Vaillant ecoTEC plus VU GB 656/4-5 A Installation And Maintenance Instructions Manual page 21

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Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
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Open the gas isolator cock.
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Check the measuring nipple for gas tightness.
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Close the gas isolator cock.
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Install the front casing. (→ Page 10)
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Disconnect the product from the power mains.
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You must not start up the boiler.
Conditions: Gas flow pressure in the permissible range
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End the check programme P.01.
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Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
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Close the gas isolator cock.
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Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
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Open the gas isolator cock.
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Check the measuring nipple for gas tightness.
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Install the front casing. (→ Page 10)
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Reset boiler controls for normal operation.
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Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commissioning
checklist.
6.12.5 Checking the CO₂ content and, if
necessary, adjusting it (air index setting)
1. Start up the product with the check programme P.1.
2. Wait at least five minutes until the product reaches its
operating temperature.
4
3. Measure the CO₂ content at the flue gas analysis point
(1).
4. Compare the measured value with the corresponding
value in the table.
Settings
CO₂ after 5 minutes in full load
mode with front casing closed
CO₂ after 5 minutes in full load
mode with front casing removed
Set for Wobbe index W₀
O₂ after 5 minutes in full load
mode with front casing closed
0020214491_01 ecoTEC plus Installation and maintenance instructions
Conditions: The CO₂ content must be adjusted
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6.12.6 Checking the CO₂ content and, if
1.
2.
1
4
2
3
3.
4.
Unit G20 natural
gas
9.2 ± 1.0
Vol.–%
9.0 ± 1.0
Vol.–%
kWh/m³ 14.1
4.53 ± 1.8
Vol.–%
Unscrew the screw (2) and tilt the air intake pipe (3) for-
wards by 90°. Do not remove the air intake pipe.
Set the CO₂ content (value with front casing removed)
by turning the screw (4).
Note
Turn to the left: Higher CO₂ content
Turn to the right: Lower CO₂ content
Only carry out the adjustment in increments of 1/8 turn
and wait approximately 1 minute after each adjustment
until the value stabilises.
After performing the adjustments, tilt the air intake pipe
back up.
Check the CO₂ content again.
If necessary, repeat the setting process.
Press the button. Full load mode is also exited if no
buttons are pressed for 15 minutes.
Use the screw (2) to secure the air intake pipe again.
If an adjustment is not possible in the specified adjust-
ment range, you must not start up the product.
If this is the case, inform Vaillant Customer Service.
Install the front casing. (→ Page 10)
necessary, adjusting it (air index setting)
Start up the product with the check programme P.1.
Wait at least five minutes until the product reaches its
operating temperature.
Measure the CO₂ content at the flue gas analysis point
(1).
Compare the measured value with the corresponding
value in the table.
Settings
CO₂ after 5 minutes in full load
mode with front casing closed
CO₂ after 5 minutes in full load
mode with front casing removed
Set for Wobbe index W₀
Start-up 6
1
2
3
Unit G20 natural
gas
9.2 ± 1.0
Vol.–%
9.0 ± 1.0
Vol.–%
kWh/m³ 14.1
21