Vaillant ecoTEC plus 937 Service Manual download pdf (Page 42)

42 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

6.9 Checking the gas setting

Caution!

Malfunctions or reduction in working life of

the boiler!

If the boiler version does not correspond to

the local gas family, there will be malfunc-

tions or you have to change components of

the boiler ahead of schedule, e. g. do not use

a LPG boiler on natural gas.

Before starting up the boiler compare the

details of the type of gas specified on the

identification plate with the type of gas

supplied at the installation site.

If the boiler version corresponds to the local gas family:

Proceed as described below.

If the boiler version does not correspond to the local

gas family:

Perform the gas conversion in accordance with the

gas conversion kit 0020010641.

Adjust the gas setting as described below

(see sections 6.9.1 to 6.9.3).

The combustion of this boiler has been checked,

adjusted and preset at the factory for operation on the

type of gas defined on the identification plate. No meas-

urement of the combustion is necessary to set up the

boiler.

Do not adjust the multifunctional automatic gas

valve.

Ensure

that the boiler has been installed in accordance

with these instructions,

the integrity of the flue system and the flue seals,

as described in the flue installation instructions

enclosed with this boiler, and as described below,

a visual check is carried out on the boiler combus-

tion circuit and the relevant seals,

that any defects have been corrected at this stage.

To further validate the integrity of the flue system and

confirm correct operation of the boiler it is possible to

conduct flue gas and air measurements on this

boiler - for details see section 6.9.1.

Proceed to put the boiler into operation as follows:

Check the maximum gas flow rate as detailed in sec-

tion 6.9.2.

Check the gas inlet working pressure as detailed in

section 6.9.3.

Note that you must re-measure the gas flow rate or

the gas inlet working pressure, if changes were

required to correct any issues found.

–

6.9.1 Checking for tightness of the flue gas

installation and flue gas recirculation

Check the integrity off the flue gas installation

according to TB 200.

Should the flue gas installation be longer than 2 m we

strongly recommend to check the system for flue gas

recirculation as described below.

Fig. 6.6 Flue gas and air measure points

Legend:

1 Flue gas measure point

2 Air measure point

For checking the system for recirculation use the air

measure point (2).

Use the flue gas analyser.

If you detect any CO or CO

in the fresh air, search

for the flue gas leakage or recirculation.

Correct the defects.

Check again as described before, if there is any CO or

in the fresh air.

If you cannot correct the defects you must not start

up the boiler.

6 Commissioning, Part I

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Vaillant ecoTEC plus 937 Service Manual Page 42

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