Vaillant ecoTEC plus 618 Spécifications télécharger pdf (Page 31)

31Instructions for installation and servicing ecoTEC

5.7 Adjusting the pumping capacity

Only in ecoTEC plus boilers:

The capacity of the two-stage pump can be adjusted to

the requirements of the heating system. If needed,

change the setting of the operating mode dependent

pump speed under the diagnostic number “d.19” (see

section 8.1.2).

5.8 Adjusting the by-pass

The appliances have an adjustable by-pass valve.

The pressure can be adjusted between 170 and 350 mbar.

Approx. 250 mbar is preset (mid-position). The pressure

changes by approx. 10 mbar each time the adjusting

screw is rotated. By turning right, the pressure increases

and turning left decreases it.

Fig. 5.11 Adjusting the by-pass valve (in combination boilers)

Fig. 5.12 Adjusting the by-pass valve (in system boilers)

• Regulating the by-pass on the adjusting screw (1).

5.9 Checking the gas supply

5.9.1 Factory settings

Caution!

Before operating the boiler check the data

badge and ensure that the correct gas type

appliance has been installed.

The boiler is supplied ready adjusted and no further gas

adjustments are necessary, however both the gas inlet

working pressures and maximum gas rates should be

checked as detailed in 5.9.2 and 5.9.3.

5.9.2 Gas inlet working pressure

Check the inlet pressure as described below:

• Remove the front case from the boiler.

• Close the gas shutoff valve fitted to the boiler.

Fig. 5.13 Checking the gas supply pressure

• Loosen the sealing screw marked “in” (1) on the gas

valve assembly.

• Connect a digital or a U gauge (2).

• Open the gas shutoff valve fitted to the boiler.

• Put the boiler into operation (refer to the Instructions

for Use supplied with the boiler).

• Check the U gauge reading and ensure the inlet gas

pressure is between the pressures detailed below.

Commissioning Part I 5

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Vaillant ecoTEC plus 618 Spécifications Page 31