Vaillant Flue pipe Specifications download pdf (Page 37)

37Instructions for installation and servicing ecoTEC 839592_12

• 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 8.2.

• In addition, ensure that maximum heat can be

dissipated into the heating system by turning up the

room thermostat.

• Alternatively, for ecoTEC combination boilers 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 5.2.

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 plus

612/615/618/624/630

824/831

ecoTEC pro

24/28

16 23 23 43

ecoTEC plus

637/837

15 23 23 43

Table 5.2 Gas inlet working pressures at the reference test

point

• Should the pressure recorded at the reference test

point in the boiler be lower than indicated (Table 5.2)

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.

- Only for combination boilers: 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.

If the gas inlet working pressure is within the

permissible range, proceed as follows:

• Take the boiler out of operation by

- Pressing the + and i buttons simultaneously and

turn down both thermostat control knobs.

- Only for combination boilers: Allow the boiler to cool

down by turning off water taps and allow pump

overrun to operate for a minimum of two minutes.

• Close gas isolation valve of the boiler.

• Remove the pressure gauge and re-tighten the sealing

screw (1).

• Open the gas isolation valve of the boiler.

• Make sure that there is no leakage at the sealing

screw.

• Put the front casing back on.

• Reset boiler controls for normal operation.

• Record the appliance gas inlet working pressure

(mbar) in the Benchmark gas boiler commissioning

checklist.

Commissioning Part I 5

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Vaillant Flue pipe Specifications Page 37

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