30
CHECKING PRESSURE AT THE BURNER AT MAXIMUM POWER
CHANGING GAS TYPE (ALL MODELS)
•
Ensure that the SERVICE function is
active and configured for maximum
power. Measure the gas pressure
after the regulator by connecting the
micromanometer to the relative pressure
outlet. Check that the measured value
is the same as that listed in the “max”
column of the “Burner pressure” table
for the specific type of gas.
When necessary, it is possible to modify
the boiler to run on types of gas which are
supported but which the boiler was not set
up for in the factory.
This modification concerns in particular
the change from NG (natural gas) to LPG
(butane/propane) and vice versa and
resulting adjustments necessary.
After finishing the gas supply pressure tests:
•
Disable the SERVICE function
•
Place the device in stand-by (off)
•
Disconnect the micromanometer
connected before the gas regulator.
TIGHTEN THE PRESSURE OUTLET SCREW
UNTIL IT SEALS
•
Disconnect the micromanometer
connected after the gas regulator.
TIGHTEN THE PRESSURE OUTLET SCREW
UNTIL IT SEALS
•
Press the gas valve regulation screws
cover closed
•
Return the instrument panel to its
operating position, fastening if necessary
•
Refit the lower cover, fastening it with
the screws
If the measured value does not correspond
to the table, adjust the external adjustment
screw on the gas valve until it does, turning
it CLOCKWISE to increase the pressure and
ANTICLOCKWISE to reduce it.
•
Repeat the measurements of the
maximum and minimum pressure at the
burner twice.
In order to perform this change the boiler’s
basic configuration must be modified to that
necessary to support the supplied type of gas.
The first step is to change the burner injectors,
which must be adapted to the type of gas
used in order to maintain the correct gas flow
rate and allow the boiler to operate within its
rated power range.
Pict. 36
THE BOILER’S OPERATION AND
SAFETY ARE NOT GUARANTEED
IN ANY MANNER IF IT IS SUPPLIED
W I T H G A S A T P R E S S U R E S
MEASURED BEFORE AND AFTER
THE GAS REGULATION VALVE
WHICH DO NOT CORRESPOND TO
THE SPECIFIED VALUES.
DYNAMIC PRESSURE mbar (MAINS)
G20 (NATURAL GAS)
G31 (PROPANE)
min
max
min
max
1,4
12,5
5,2
37
1,2
13,0
4,8
37
1,2
11,6
4,7
37
Ivy 24 MR
Ivy 28 MR
Ivy 32 MR
Summary of Contents for IVY 24 MR/MN
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