Vaillant ecoTEC plus 937 Service Manual download pdf (Page 44)

44 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

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 com-

pany 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 mini-

mum of two minutes.

Close the gas isolation valve of the boiler.

Remove the pressure gauge and re-tighten the seal-

ing 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 permissi-

ble range, 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 mini-

mum of two minutes.

Close the gas isolation valve of the boiler.

Remove the pressure gauge and re-tighten the seal-

ing 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.

–

6.10 Assembling the front panel

Fig. 6.8 Fitting the front casing

Hook the front casing section into the tabs at the top

of the frame of the combi boiler and slide the lower

section of the casing into the position provided.

Make sure that the spring clips (2) engage properly.

Tighten the securing screw of the enclosure (1).

6.11 Adjusting the central heating system

(range rating)

The appliance is fully modulating for central heating and

it is therefore not necessary to range rate the appli-

ance. However if desired it is possible to range rate the

boiler as follows:

Press the "i“ and "+“ buttons simultaneously.

Hold the button "+“ down until "d.0“ is displayed.

The display runs from "d.0“ to "d.99“ and

then starts again at "d.0“.

Press the "i" button. The symbol "=“ is displayed.

Then the part load setting is shown in kW.

Use the buttons "+“ and "–“, to increase or decrease

the displayed value in steps of 1 kW. The displayed

value flashes during the setting process. The availa-

ble setting ranges are shown in Table 6.3.

Push the button "i“ for about five seconds or until

the display stops flashing. This stores the value in the

memory. The display reverts back to the normal sta-

tus (display of current feed temperature, for example

45 °C).

To de-activate the setting mode, simultaneously push

the buttons "i“ and "+“.

6 Commissioning, Part I

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Vaillant ecoTEC plus 937 Service Manual Page 44

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