COMMISSIONING
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B
Switch off the power supply to the heating system.
Fig. 80 Switch off the power supply to the heating system
B
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
B
Close the gas valve.
Fig. 81 Closing the gas valve
B
Open the screw plug on the testing nipple of the gas
supply pressure and for purging [1] by 2 turns and
install a hose.
B
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.
B
Purge the gas supply into a well ventilated area.
B
Close the gas shut-off valve when no more air is
present (fig. 87).
B
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
B
Isolate all other appliances.
B
Set the boiler to full load.
B
Ensure that there is no modulating of the fan gas valve
by operating the test mode.
B
Carry out the gas consumption procedure as
described in the latest edition of the Essential Gas
Safety book.
ON
OFF
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6 720 648 726-081.1TD
NOTE:
B
Test the tightness of the measuring
nipple(s) used.
GB162-65
GB162-80/100
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