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GAS SUPPLY ADJUSTMENTS
(COMMISSIONING PART II)
Fig. G. 1: Gas inlet working pressure
34
1
2
Gas inlet working
pressure
To check the gas inlet working pressu-
re:
Lower the front panel of the boiler.
Lower the control panel.
Slacken the sealing screw (1)
located at measuring point „MIN".
Attach U-gauge to the inlet test
point on the gas valve (2).
Ensure that the gas service valve is
open.
Set the DHW temperature control
to maximum and fire the boiler at
full rate by opening a hot water
tap.
Ensure that the hot water outlet
temperature adjustment control is
set to maximum.
Check that the U-gauge is reading
in the range of 18 to 20 mbar. (If
the pressure is not within this range
this should be investigated before
continuing with the commissioning
preocedure.
Lower pressures than this range are
indicative of an incorrectly sized or
partially blocked gas supply.)
Turn off the hot tap.
Remove U-gauge, tighten test point
sealing screw (1).
Test for soundness.
Record appliance working gas inlet
pressure (mbar) in the Benchmark,
Installation, Commissioning and
Service log book and handover to
the user.
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