Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual page 20

6 Start-up
Conditions: Gas flow rate not in the permissible range
▶
Check all of the piping and ensure that the gas flow rates
are correct.
▶
Only put the product into operation once the gas flow
rates have been corrected.
Conditions: Gas flow rate in the permissible range
▶
End the check programme P.01.
▶
Allow the boiler to cool down by allowing pump overrun to
operate for a minimum of two minutes.
▶
Record the boiler maximum gas flow rate onto the
Benchmark gas boiler commissioning checklist.
6.10.4 Checking the gas flow pressure
1. Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
2. Close the gas isolator cock.
1
2
3. Undo the sealing screw (1) that is marked with in on the
gas valve.
4. Connect a digital pressure gauge or U-tube manometer
(2).
5. Open the gas isolator cock.
6. Start up the product with the check programme P.1.
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.
–
Permissible gas flow pressure for operation with
G20 natural gas: 1.6 ... 2.3 kPa (16.0 ... 23.0 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.
20
Conditions: 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.
▶
If you cannot correct the failure, notify the gas supply
company and proceed as follows:
▶
End the 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 isolator cock.
▶
Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶
Open the gas isolator cock.
▶
Check the measuring nipple for gas tightness.
▶
Close the gas isolator cock.
▶
Install the front casing. (→ Page 11)
▶
Disconnect the product from the power mains.
▶
You must not start up the boiler.
Conditions: Gas flow pressure in the permissible range
▶
End the check programme P.01.
▶
Allow the boiler to cool down allowing pump overrun to
operate for a minimum of two minutes.
▶
Close the gas isolator cock.
▶
Remove the pressure gauge and retighten the sealing
screw (1) for the measuring nipple.
▶
Open the gas isolator cock.
▶
Check the measuring 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 commissioning
checklist.
6.10.5 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.
Installation and maintenance instructions ecoTEC plus 0020029173_04