Adjusting The Central Heating Output; Rating) - Vaillant aquaPlus Instructions For Installation And Servicing

7 Gas supply adjustments (Commissioning Part II)
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.
28
Supplied by HeatingSpares247.com
Fig. 7.5: Using nozzle pressure to check and adjust the heating
system partial load
Instructions for installation and servicing aquaPLUS VUI 362-7
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