Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 26)

7 Gas supply adjustments (Commissioning Part II)

Instructions for installation and servicing aquaPLUS VUI 362-726

Fig. 7.3: Setting the maximum heating load (nominal load)

7.3 Adjusting to the maximum heat load (nominal

load)

• Remove the cap (1).

• Set the DHW temperature control to maximum and

fire the boiler at full rate by fully opening a hot water

tap.

• Turn off the boiler at the main ON/OFF control.

• Press and hold the "+" button, while pressing the

button turn the main ON/OFF control to the "1" ON

position.

• Continue holding "+" button until display alternates

between "P1, P2, P3, P11, P12 and P13". Release "+"

button.

• Press "+" button until "P1" (full gas rate) is shown in

display.

• Press "i" button to operate boiler at full gas rate.

• Using a 10 mm spanner turn nut (2) to adjust the

burner operating pressure.

- Turn the nut (2) clockwise to increase the nominal

load

- Turn the nut (2) anticlockwise to decrease the

nominal load.

• Adjust the burner pressure until it matches the

maximum output as detailed in table 7.7, page 30.

• Now turn the 10 mm nut (2) anticlockwise until the

burner pressure drops by approx. 0.3 - 0.4 mbar.

Nominal load is now correctly adjusted.

• Refit the plastic cap (1).

Warning!

The plastic cap (2)must be fitted for the gas

valve assembly to function correctly.

• Turn off the hot water tap.

• To cancel selected "P1" or "P2" mode press the "i"

and "+" buttons simultaneously.

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 26