Commissioning
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▶ Slowly open the gas valve by pushing on the gas valve and turning it
¼ rotation in an anticlockwise direction. The gas valve is open when
it is in the vertical position.
Fig. 79 Open the gas valve
▶ Switch off the power supply to the heating system.
Fig. 80 Switch off the power supply to the heating system
▶ Check the new pipe section up to and including its connection (i.e.
direct sealing location) to the gas fitting for leaks, using a foaming
product. The maximum test pressure allowed at the gas valve inlet is
150 mbar.
10.2.2 Bleeding the gas flow pipe
▶ Close the gas valve.
Fig. 81 Closing the gas valve
▶ Open the screw plug on the testing nipple of the gas supply pressure
and for purging [1] by 2 turns and install a hose.
▶ Slowly open the gas valve by pushing on the gas valve and turning it
anticlockwise through ¼ rotation ( fig. 85, page 58). The gas valve
is open when it is in the vertical position.
▶ Purge the gas supply into a well ventilated area.
▶ Close the gas shut-off valve when no more air is present (fig. 87).
▶ Remove the hose and tighten the screw plug on the testing nipple
again.
Fig. 82 Bleeding the gas flow pipe
10.2.3 Gas consumption test
▶ Isolate all other appliances.
▶ Set the boiler to full load.
▶ Ensure that there is no modulating of the fan gas valve by operating
the test mode.
▶ Carry out the gas consumption procedure as described in the latest
edition of the Essential Gas Safety book.
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