2. Use a screwdriver to undo the sealing screw on the
measuring connection (1) of the gas valve.
3. Connect a pressure gauge (2) to the measuring nipple
(1).
4. Open the gas isolator cock.
5. Start up the product with the check programme P.01.
6. Measure the gas connection pressure against atmo-
spheric pressure.
Permissible connection pressure
Great Bri-
tain
Natural gas G20
1.7
… 2.5 kPa
(17.0
… 25.0 mbar)
7. Decommission the product.
8. Close the gas isolator cock.
9. Remove the pressure gauge.
10. Tighten the screw on the measuring nipple (1).
11. Open the gas isolator cock.
12. Check the measuring nipple for gas tightness.
Conditions: Gas connection pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas connec-
tion pressure.
If the gas connection pressure lies outside
the permissible range, this can cause oper-
ating faults in and damage to the product.
▶ Do not make any adjustments to the
product.
▶ Do not start up the product.
▶ If you are unable to remedy the fault, contact the gas
supply company.
▶ Close the gas isolator cock.
7.8 Checking the CO₂ content
1. Start up the product with the check programme P.01.
2. Wait at least five minutes until the product reaches its
operating temperature.
3. Measure the CO₂ content at the flue gas analysis point.
4. Compare the measured value with the corresponding
value in the table.
Settings Unit G20
natural
gas
CO₂ after 5 minutes in full load mode
with front casing closed
Vol.–% 9.2 ± 1.0
CO₂ after 5 minutes in full load mode
with front casing removed
Vol.–% 9.0 ± 1.0
Set for Wobbe index W₀ kWh/m³ 15
CO in full load mode ppm ≤ 250
CO/CO₂ ≤ 0.0031
5. Set the CO₂ content as required. (→ Page 18)
7.9 Setting the CO₂ content
1. Remove the yellow sticker.
2. Remove the blue covering cap (1).
3. Use an Allen key to turn the bolt in order to set the CO₂
content (value with front casing removed).
◁ Turning to the right decreases the value.
◁ Turning to the left increases the value.
4. For natural gas only: Only perform the adjustment in
increments of a 1/8 turn and wait approx. one minute
after each adjustment until the value stabilises.
5. For liquid gas only: Only perform the adjustment in
small increments (approx. 1/16 turn), and wait approx.
one minute after each adjustment until the value stabil-
ises.
6. If an adjustment is not possible in the specified adjust-
ment range, you must not start up the product.
7. If this is the case, inform Vaillant Customer Service.
8. Secure the covering cap.
9. Install the front casing. (→ Page 10)
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