Vaillant ecoMAX 635, Instructions For Installation And Servicing

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Commissioning Part I 5
Instructions for installation and servicing ecoMAX
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• Turn off the appliance, remove U gauge.
• Tighten the test point screw and test for soundness.
• Record appliance working gas inlet pressure (mbar) in
the Benchmark gas boiler commissioning checklist.
5.8.3 Check gas rate
The boiler is fitted with a fully modulating automatic gas
valve which ensures that the precise air/gas ratio is provi-
ded under all operating conditions. The gas rate has been
set during production and does not require adjustment.
The gas rate of the boiler should be checked with the
front case fitted as follows:
• Activate full gas rate mode by simultaneously pressing
the ”+” and ”–” buttons on the display system
• Wait at least 5 minutes, or until the boiler has reached
its operating temperature
• With all other gas appliances turned off measure the
gas rate at the gas meter. Check that the gas rate is as
stated in Table 5.1.
Fig. 5.2 Measuring the inlet working pressure
5.9 Refitting the case
Fig. 5.3 Removing/Refitting the case
Note!
Ensure that the front panel retaining cords are
positioned such that they will not become trap-
ped in the casing.
• Hook the top of the front casing (4) over the lip on the
top of the boiler chassis and push the bottom of the
front casing (3) into place.
• Ensure the spring retaining clips (2) engage correctly.
• Tighten case securing screw (1).
5.10 Adjusting the central heating output (range rating)
The boilers are fully modulating for central heating, and
it is therefore not necessary to range rate the boiler.
However, if desired, it is possible to range rate the boiler,
as follows:
1 Press the ”i” and ”+” buttons simultaneously.
Fig. 5.4 ff Adjusting the central heating output
2 Keep the ”+” button pressed until ”d.0” is displayed. The
display runs from ”d.0” to ”d.99” before restarting at ”d.0”.
3 Press the ”i” button. The ”=” symbol is displayed. The
part–load setting is now displayed in kW.
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80020014605_00GB_032006 22.02.2006 21:36 Uhr Seite 25