Checking The Gas Supply Pressure - Wolf CGB-75 Installation And Operating Instructions Manual

Checking the gas supply pressure
(gas flow pressure)
Work on gas components must only be performed
by a licensed gas fitter. Work that is carried out
incorrectly may lead to gas escaping, resulting in a
risk of explosion, asphyxiation or poisoning.
- The condensing boiler must be switched OFF; open the gas
shut-off valve
Release the casing cover with the l.h. and r.h. screw. Release
the bottom of the casing cover and unhook at the top
- Release the plug at test nipple  and vent the gas supply
line
- Connect the differential pressure meter or U-tube manometer
to the test nipple  at "+", with "-" against atmosphere
- Switch the ON/OFF switch to ON
- After starting the appliance, check the supply pressure on
the differential pressure meter
Natural gas
Note
If the supply pressure (flow pressure) is outside
the 18 to 25 mbar range, adjustments must not
be carried out and the boiler must not be started.
There is a risk of faulty boiler functions.
LPG:
Note
If the supply pressure (flow pressure) is outside
the 43 to 57 mbar range, adjustments must not
be carried out and the boiler must not be started.
There is a risk of faulty boiler functions.
- Switch OFF ON/OFF switch; close the gas shut-off valve
- Remove the differential pressure tester and
re-seal the test nipple with plug .
- Open the gas shut-off valve
- Check that the test nipple is gas-tight
- Complete the enclosed notice and affix it to the inside of the
casing
- Close the appliance again
There is a danger of gas escaping, leading to
a risk of explosion, asphyxiation or poisoning
unless all of the screws are tightened.
32
17. Checking the gas supply pressure
Fig.: Undoing screws
Fig.: Checking the gas supply pressure
Fig.: Shut-off systems
Screws

Gas shut-off valve
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