Vaillant ecoTEC plus VC 406/5-5 - Checking the gas flow pressure; Checking the CO2 content and, if necessary, adjusting it (air ratio setting)

7 Start-up
24 Installation and maintenance instructions ecoTEC plus 0020261188_00
2.
Alternatives 2 / 2 ‒ Measuring the gas pres-
sure at the gas connection:
▶ Undo the test nipple screw (C) at the gas connec-
tion.
▶ Connect a digital manometer or U-tube manometer
(D).
3. Open the gas stopcock.
4. Open the hydraulic circuit's valves.
5. Start up the product with the check programme P.01.
6. Measure the gas flow pressure in comparison with the
atmospheric pressure.
Gas connection pressure/gas flow pressure
difference for G20
Permitted gas flow
pressure that is
measured at point
(D)
Permitted gas flow
pressure that is
measured at point
(B)
VC 406/5-5
(E-DE)
1.70 … 2.50 kPa
(17.00
… 25.00 mbar)
1.60 … 2.40 kPa
(16.00
… 24.00 mbar)
VC 476/5-5
(E-DE)
1.70 … 2.50 kPa
(17.00
… 25.00 mbar)
1.60 … 2.40 kPa
(16.00
… 24.00 mbar)
VC 636/5-5
(E-DE)
1.70 … 2.50 kPa
(17.00
… 25.00 mbar)
1.55 … 2.35 kPa
(15.50
… 23.50 mbar)
Gas connection pressure/gas flow pressure
difference for G25
Permitted gas flow
pressure that is
measured at point
(D)
Permitted gas flow
pressure that is
measured at point
(B)
VC 406/5-5
(E-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.83 kPa
(18.50
… 28.30 mbar)
VC 406/5-5
(LL-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.83 kPa
(18.50
… 28.30 mbar)
VC 476/5-5
(E-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.83 kPa
(18.50
… 28.30 mbar)
VC 476/5-5
(LL-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.83 kPa
(18.50
… 28.30 mbar)
VC 636/5-5
(E-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.85 kPa
(18.50
… 28.50 mbar)
VC 636/5-5
(LL-DE)
2.00 … 3.00 kPa
(20.00
… 30.00 mbar)
1.85 … 2.85 kPa
(18.50
… 28.50 mbar)
Gas connection pressure/gas flow pressure
difference for G31
Permitted gas flow
pressure that is
measured at point
(D)
Permitted gas flow
pressure that is
measured at point
(B)
VC 406/5-5
(E-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.45 … 4.45 kPa
(24.50
… 44.50 mbar)
VC 406/5-5
(LL-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.45 … 4.45 kPa
(24.50
… 44.50 mbar)
VC 476/5-5
(E-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.45 … 4.45 kPa
(24.50
… 44.50 mbar)
VC 476/5-5
(LL-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.45 … 4.45 kPa
(24.50
… 44.50 mbar)
VC 636/5-5
(E-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.35 … 4.35 kPa
(23.50
… 43.50 mbar)
VC 636/5-5
(LL-DE)
2.50 … 4.50 kPa
(25.00
… 45.00 mbar)
2.35 … 4.35 kPa
(23.50
… 43.50 mbar)
7. Decommission the product.
8. Close the gas stopcock.
9. Remove the manometer.
10. Tighten the test nipple screw (A) or (C).
11. Open the gas stopcock.
12. Check the test nipple for gas tightness.
Conditions: Gas flow pressure not in the permissible range
▶ If you are unable to eliminate the fault, contact the gas
supply company.
▶ Close the gas stopcock.
7.8.3 Checking the CO₂ content and, if
necessary, adjusting it (air ratio setting)
1. Ensure that the heating circuit valves are open.
2. Start up the product with the check programme P.01.
3. Wait at least five minutes until the product reaches its
operating temperature.
1
4. Measure the CO₂ content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.