Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 28)

7 Gas supply adjustments (Commissioning Part II)

Instructions for installation and servicing aquaPLUS VUI 362-728

7.5 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:

• Connect the U-gauge to check burner pressure.

• Use Table on page 30 to determine the central

heating output required.

• Identify required range rating setting and note main

burner pressure in mbar for that output.

• Turn on the central heating.

• Ensure that any thermostatic radiator valves are open

and set to high.

• Simultaneously press and release the "+" and "-"

buttons to activate burner pressure mode.

• The boiler will light at the factory set nominal gas

rate.

Warning!

DO NOT open any hot water tap while carrying

out this procedure.

• Check that the U-gauge reading corresponds to the

maximum burner pressure as detailed on the table.

• Adjust central heating output range as shown on

page 29.

Fig. 7.5: Using nozzle pressure to check and adjust the heating

system partial load

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 28