Machines With Alternative Gas Heater Version - Laranzato GREEN Serie Gebrauch Und Instandhaltung

11. MACHINES WITH ALTERNATIVE GAS
HEATER VERSION (Fig.14)
N .B. Installation of the machine and any
adjustment or adaptation to the type of gas
should be done by a technically qualified
person.
The machine leaves the factory all set for use
with liquid gas (GPL).
The gas regulator (1) is therefore fitted with the ap-
propriate injector shown in the table below:
Nominal
Model thermic
capacity
2,5 KW
2 Gr.
(2150 Kcal/h.)
3,3 KW
3-4 Gr
(2850 Kcal/h.)
he primary air intake regulator (2) is set with the
T
reference notch showing "GPL" corresponding to the
fixture screw (3).
The flame is regulated (minimum and maximum) to
suit this type of gas.
If the machine is to be used with a different type
of gas, it will be necessary to replace the injector
in accordance with the above table and to rotate
the primary air regulator (2), which, in the case of
natural gas, will have to be set with the reference
notch showing "N" corresponding to the securing
screw (3).
To do this, it will of course be necessary to loosen
the securing screw (3) and to tighten it again after
rotating the primary air intake regulator (2).
Connections to mains gas, from the gas tap available
in the room to the valve fitted on the machine, must
be carried out in accordance with the regulations
in force, using a flexible pipe or a rigid pipe of soft
copper.
In the latter case, the special rubber-pipe fitting in
connected tightly to the valve by means of the bico-
nical nozzle and securing nut supplied.
The flexible pipe is fitted over the end of the mains
outlet and secured with the metal strip supplied.
Alternatively, the soft copper pipe can be connected
up, again using the special biconical nozzle and the
appropriate nuts, directly to the valve.
Once the machine has been connected up to the
gas main, and after filling the boiler up with water in
accordance with the instructions in the booklet ("IN-
STRUCTIONS FOR USE AND MAINTENANCE"),
the burner can be lit in the following manner:
● Open the gas exclusion tap.
● Press on the gas valve knob, on the machine rotate
it 90° anti-clockwise, and keep it pressed in. At
the same time, press the piezoelectric lighter one
or more times – the lighter knob bears a symbol
resembling a spark – until the burner lights up.
GPL Natural gas
G30 - 29 mbar G20 - 20 mbar
(cent of milimeter) (cent of milimeter)
75 102
90 135
● Wait about 20 seconds, then release the valve
knob and the burner should stay lit – the flame is
vidible through the special hole in the panel behind
the dispenser units.
N.B.
Should the burner not light up, do not persist, but
release the valve knob, and then check that lighter
spark on the burner is in order and about 5 mm
long.
Should the flame go out when the valve knob is re-
leased, check the position of thermocouple and the
circuit connected to it.
The flame should be bright blue; if not, slightly regu-
late the primary air intake (2) until the desired effect
is achieved.
Wait until the machine reaches the correct pressure,
according to instructions. Otherwise, adjust the gas
pressure regulator, which has two regulating screws.
The one that protrudes more (4) serves to regulate
the boiler's operating pressure, while the other (5)
serves to set the flame at the minimum.
When the machine is pressurized, check to see
that the minimum flame is correct by adjusting the
screw (4) if necessary; after loosening the locking-
nut, unscrew the screw until it feels loose (the main
gas-pipe is closed), and check whether, under these
conditions, the low flame remains lit, thus acting as
a pilot.
If the flame is too high, it will be necessary to regulate
screw (5), turning it slightly clockwise, of course after
having loosened the locking-nut. If, on the contrary,
the flame tends to go out, then regulate screw (5) by
turning it anti-clockwise, until a very low, but constant
flame is obtained. Having achieved this correct adju-
stment of the minimum flame, hold the screw still and
lock it with the locking-nut.
Then rotate the screw (4) clockwise until there is a
there is a high flame, and wait for the boiler to reach
the desired operating pressure: if the flame dies
down before reaching the required pressure, tighten
screw (4) further; if the flame dies down at a higher
pressure, then unscrew the screw.
Check once or twice by opening the steam tap to
release the pressure in the boiler, then hold screw
(4) still and lock it with the locking-nut.
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