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

Checking the gas supply pressure

(Gas supply pressure)
Work on gas components must only be performed
by a licenced gas fitter. Work which 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
pipe
- Connect the differential pressure meter or U-tube manometer
to the test nipple  at "+", with "-" against atmosphere
- Switch ON the ON/OFF switch
- After starting the boiler, check the supply pressure at the
differential pressure meter.
Natural gas:
NB
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:
NB
If the supply pressure (flow pressure) is outside
the 25 to 45 mbar range (supply pressure
37 mbar) or 43 to 57 mbar range (supply
pressure 50 mbar), 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 meter and
re-seal the test nipple with plug 
- Open the gas shut-off valve
- Check the test nipple for gas-tightness
- Complete the enclosed notice and affix to the inside of the
casing
- Close the boiler again
If any screws are not tightened, there is a danger
of gas escaping, leading to a risk of explosion,
asphyxiation or poisoning.
30 62 555_0709
Checking the gas supply pressure
Figure: Undoing screws
Figure: Checking the gas supply pressure
Figure: Shut-off valves
Screws

Gas shut-off valve
25