Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 27

▶
Connect a digital manometer or U-tube manometer
(B).
Alternatives 2 ‒ Measuring the gas pressure at
3.
the gas connection::
▶
Undo the test nipple screw (C) at the gas connec-
tion.
▶
Connect a digital manometer or U-tube manometer
(D).
4. Open the gas stopcock.
5. Open the hydraulic circuit's valves.
6. Start up the product with the check programme P.01.
7. In addition, ensure that maximum heat can be dissip-
ated into the heating system by turning up the room
thermostat.
8. With the boiler operating at full load check that the gas
inlet working pressure at the reference test point (1)
complies with the requirements.
Gas connection pressure/gas flow pressure
difference for G20
Permitted gas flow
pressure that is
measured at point
(D)
VU 446/5-5
1.70 ... 2.50 kPa
(H-GB)
(17.00
... 25.00 mbar)
VU 606/5-5 1.70 ... 2.50 kPa
(H-GB)
(17.00
... 25.00 mbar)
Gas connection pressure/gas flow pressure
difference for G31
Permitted gas flow
pressure that is
measured at point
(D)
VU 446/5-5 2.50 ... 4.50 kPa
(H-GB)
(25.00
... 45.00 mbar)
VU 606/5-5
2.50 ... 4.50 kPa
(H-GB)
(25.00
... 45.00 mbar)
9. Should the pressure recorded at the reference test point
in the boiler be lower than indicated check if there is
any blockage in the pipework or if the pipework is un-
dersized.
Condition: Gas flow pressure not in the permissible range
Caution.
Risk of material damage and operating
faults caused by incorrect gas flow pres-
sure.
If the gas flow pressure lies outside the per-
missible range, this can cause operating
faults in and damage to the product.
▶
Do not make any adjustments to the
product.
▶
Check the gas installation.
▶
Do not start up the product.
0020261389_02 ecoTEC plus Installation and maintenance instructions
▶
▶
▶
▶
▶
▶
▶
▶
▶
▶
▶
Condition: Gas flow pressure in the permissible range
▶
▶
▶
Permitted gas flow
▶
pressure that is
measured at point
▶
(B)
▶
1.60 ... 2.40 kPa
▶
(16.00
▶
... 24.00 mbar)
1.55 ... 2.35 kPa
Applicability: Great Britain
(15.50
... 23.50 mbar)
OR Ireland
▶
Permitted gas flow
pressure that is
measured at point
7.10.5 Checking the CO₂ content and, if necessary,
(B)
2.45 ... 4.45 kPa
1.
(24.50
2.
... 44.50 mbar)
3.
2.35 ... 4.35 kPa
(23.50
... 43.50 mbar)
4.
5.
If you cannot correct the failure, notify the gas supply
company and proceed as follows:
End check programme P.01.
Allow the boiler to cool down by allowing pump overrun
to operate for a minimum of two minutes.
Close the gas stopcock.
Remove the pressure gauge and retighten the sealing
screw (A) or (C) for the measuring nipple.
Open the gas stopcock.
Check the test nipple for gas tightness.
Close the gas stopcock.
Install the front casing. (→ Page 11)
Disconnect the product from the power grid.
You must not start up the boiler.
End check programme P.01.
Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
Close the gas stopcock.
Remove the pressure gauge and retighten the sealing
screw (A) or (C) for the measuring nipple.
Open the gas stopcock.
Check the test nipple for gas tightness.
Install the front casing. (→ Page 11)
Reset boiler controls for normal operation.
Record the appliance gas inlet working pressure (kPa
resp. mbar) in the Benchmark gas boiler commission-
ing checklist.
adjusting it (air ratio setting)
Ensure that the heating circuit valves are open.
Start up the product with the check programme P.01.
Wait at least five minutes until the product reaches its
operating temperature.
1
Use a combustion analyser to measure the CO₂ content
at the flue gas analysis point (1).
Compare the measured value with the corresponding
value in the table.
Start-up 7
27