7 Gas supply adjustments (Commissioning Part II)
Instructions for installation and servicing aquaPLUS VUI 362-7
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7 Gas supply adjustments
(Commissioning Part II)
7.1 Gas inlet working pressure
To check the gas inlet working pressure:
• Lower the front panel of the boiler.
• Lower the control panel.
• Slacken the sealing screw (1) located at measuring
point "P.IN".
• Attach U-gauge to the inlet test point on the gas
valve (2).
• Ensure that the gas service valve is open.
• 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.
• Check that the U-gauge is reading in the range
between 18 and 20 mbar. If the pressure is not within
this range this should be investigated before
continuing with the commissioning procedure. Lower
pressures than this range are indicative of an
incorrectly sized or partially blocked gas supply.
• Switch off the boiler at the main ON/OFF control.
• Remove U-gauge, tighten test point sealing screw (1).
• Test for soundness.
• Record appliance working gas inlet pressure (mbar) in
the Benchmark gas boiler commissioning checklist.
Fig. 7.1: Checking the inlet pressure (gas-flow pressure)
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834702_33GB_012005.qxd 09.03.2005 16:26 Uhr Seite 24
