Gas Type Change; Switching From Gas In The Second Group To Gas In The Third Group; Switching From Gas In The Third Group To Gas In The Second Group; Gas Unit - Accorroni GHIBLI 4-5-6 ELITE Technical Information

6. GAS TYPE CHANGE

WARNING! The operations described below
must be carried out by skilled technical
personnel.
6.1 SWITCHING FROM GAS IN THE SECOND
GROUP (G20) TO GAS IN THE THIRD
GROUP (G30 - G31)
a) Check that the envelope supplied with the air
heater contains the replacement injector, the
screw block with pin and the adhesive label,
on which to indicate the new type of gas being
used, to replace the original one
b) check that the diameter of the injector
indicated for the type of gas to be used (see
technical data table on page 11) corresponds
to what is stamped on the injector.
c) close the gas on-off valve and disconnect the
electric power supply. Remove the air heater
casing using the two screws located at the
bottom and the two screws at the top, which
can be accessed by using the screwdriver
supplied with the kit
d) remove the 6 screws which attach the burner
support plate to the combustion chamber.
Pull it out making sure not to damage the seal
gasket. Disassemble the gas injector using a
10 mm hex wrench and replace it with the new
one, then re-tighten it to ensure a proper seal
(fig. 23)
e) replace the burner support plate making sure
that the gasket is in the correct position.
Attach the plate using the 6 screws that were
previously removed

GAS UNIT

Electric
connection
Gas
Pressure outlet
Pressure inlet
Pressure set screw
Fig. 22
page 20
f) unscrew the pressure regulator protection plug
located on the gas unit. With care, fully tighten
the plastic screw of the pressure regulator.
Insert the screw block with pin instead of the
protection plug to put the regulator out of
service (fig. 23). Keep the pressure regulator
protection plug for future use
g) insert the water column pressure gauge tube
into the upstream pressure inlet on the burner
(fig. 22) after having backed off the closing
screw a few turns
h) start the air heater according to what is
indicated in point 5.2. Check that the supply
pressure corresponds to what is indicated in
the technical data table. If the gas supply
pressure does not correspond to the value
indicated, use the pressure regulator (second
stage) installed externally to obtain the correct
value
i) remove the pressure gauge tube and tighten
the pressure inlet screw
l) use a special spray or electronic leak detector
to identify any leaks in the gas circuit
m)replace the air heater casing and attach it at
the four special points.
6.2 SWITCHING FROM GAS IN THE THIRD
GROUP (G30 - G31) TO GAS IN THE
SECOND GROUP (G20)
a) check that the adaptation kit envelope contains
the replacement injector and the adhesive
label, on which to indicate the new type of gas
being used, to replace the original one
b) close the gas on-off valve and disconnect the
electric power supply. Remove the air heater
casing using the two screws located at the
bottom and the two screws at the top, which
can be accessed by using the screwdriver
supplied with the kit
c) remove the 6 screws which attach the burner
support plate to the combustion chamber.
Pull it out making sure not to damage the seal
gasket. Disassemble the gas injector using a
10 mm hex wrench and replace it with the new
one, then re-tighten it to ensure a proper seal
(fig. 23)
d) replace the burner support plate making sure
that the gasket is in the correct position.
Attach the plate using the 6 screws that were
previously removed
e) on the gas unit, remove the screw block with
pin located on the pressure regulator to reset
regulation operation (fig. 23)