Technical data

Installation and maintenance instructions ecoTEC exclusive 0020017768_0526
6.2.3 Checking the gas inlet working pressure
• Ensure that the gas inlet working pressure can be
obtained with all other gas appliances in the property
working.
• Remove the front casing from the boiler.
• Close the gas isolation valve of the boiler.
2
1
Fig. 6.6 Measuring the gas inlet working pressure
• Loosen the sealing screw marked “in” (1) on the gas
valve.
• Connect a digital pressure gauge or U-tube
manometer (2).
• Open the gas isolation valve of the boiler.
• Start the boiler by activating the test program P.1 as
described in Section 9.2.
• In addition, ensure that maximum heat can be
dissipated into the heating system by turning up the
room thermostat.
• Alternatively, fully open the hot water taps to ensure
full flow rate through the boiler.
• With the boiler operating at full load check that the
gas inlet working pressure at the reference test
point (1) complies with the requirements of Table 6.4
• Should the pressure recorded at the reference test
point in the boiler be lower than indicated (Table 6.4)
check if there is any blockage in the pipework or if the
pipework is undersized.
• If the supply pressure is out of tolerance contact your
Emergency Service Provider.
If the gas inlet working pressure at the reference test
point (1) is not within the permissible range and you
cannot correct the failure, notify the gas supply
company or the Vaillant Service Solutions team and
proceed as follows:
• Take the boiler out of operation by
- Pressing the + and i buttons simultaneously and
turn down both thermostat control knobs.
- Allow the boiler to cool down by turning off water
taps and allow pump overrun to operate for a
minimum of two minutes.
• Close the gas isolation valve of the boiler.
• Remove the pressure gauge and re-tighten the sealing
screw (1).
• Turn on gas at the gas isolation valve.
• Make sure that there is no leakage at the sealing
screw.
• Turn off gas at the gas isolation valve.
• Put the front casing back on.
• Turn off electrical supply to the boiler.
• You must not start up the boiler.
6 Start-up
ecoTEC appliance
Natural gas (G20) LPG (G31)
Minimum pressure at
reference test point in
mbar
Maximum pressure at
reference test point in
mbar
Minimum pressure at
reference test point in
mbar
Maximum pressure at
reference test point in
mbar
ecoTEC exclusive 832 16 23 23 43
ecoTEC exclusive 838 15 23 23 43
Table 6.4 Gas inlet working pressures at the reference test point