22
CHECKING THE MAINS GAS SUPPLY DYNAMIC PRESSURE
• - Use the SERVICE function to bring the boiler to
maximum power.
• - Measure the gas pressure before the regulator
(dynamic mains supply pressure).
Whenever dynamic pressures
below the specified minimum
levels should be found:
• Check that there are no kinks,
blocks or other impediments to
the normal gas flow in the gas
supply line to the boiler.
• Check that the diameter of
piping used for the gas supply
line is sufficient and constant
along the whole length.
• Check that there are no
elements in the supply line
which could lead to excessive
pressure drops, e.g. too
many bends, changes of
direction, excessively long or
countersloping sections etc.
• Consult the gas company on
the specified minimum supply
pressure values.
•
Whenever dynamic pressures
above the specified maximum
values should be found:
• Install a suitable pressure
reducer/regulator on the gas
supply line before the boiler.
• Adjust the dynamic pressure
of the gas via the regulator, if
already present.
• Check that the value measured with the
manometer falls within the max-min interval given
in the “Dynamic mains supply pressure” table for
the specific type of gas.
Pict. 24
Pict. 25
DINAMIC PRESSURE mbar (MAINS)
G20 (NATURAL
GAS)
G30 (BUTANE)
G31 (PROPANE)
min
max
min
max
min
max
17
25
25
35
25
37
Summary of Contents for ISA 20 BITHERMAL
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