Accorroni GHIBLI 4-5-6 ELITE, Техническая информация

Страница: 21 / 32

page 19
been purged and the ignition is regular.
The exchanger heating phase begins after the
burner has been ignited. The exchanger reaches
the rated operating temperature after about three
minutes and at that point a thermostat starts the
fan to distribute warm air in the environment.
5.2.2 Controls
WARNING! When operations or visual
inspections are performed on the air heater,
be extremely cautious and work under safe
conditions.
Insert the water column pressure gauge tube
into the pressure outlet on the gas unit (fig. 22)
after having backed off the screw a few turns.
Start the air heater and check that the pressure
to the burner corresponds to what is indicated in
the technical data table.
If the pressure of the gas delivered to the burner
does not correspond to the value indicated, use
the special pressure set screw
(fig. 22) , after
having removed the protection plug, to obtain
the specified value. Turn it counterclockwise to
decrease the pressure and clockwise to increase
the pressure (this operation can be carried out
only when using natural gas G20).
Turn the room thermostat dial to the minimum
value and check that the burner shuts off.
Remove the pressure gauge tube and tighten
the pressure regulator screw, carefully checking
the seal. Replace the regulator protection plug.
WARNING! When the burner turns off, the
fan(s) will continue to operate for a few
minutes, to properly cool the exchanger.
Therefore, it is important not to turn off the
air heater using the mains switch, that also
cuts off the power supply to the fan(s), since
this might lead to overheating and trip the
safety thermostat.
Then repeat the start-up operation to observe
and check that the burner has ignited correctly
and that the flame is stable.
5.3 USEFUL INFORMATION
It is recommended that the user be informed
about all the operations necessary to use the
air heater correctly, with particular reference
to the ignition and shutdown phases and
about the importance of periodic tests, which
must be performed at least once every year
by skilled personnel.
5.2 IGNITION
5.2.1 Ignition procedure
(Refer to fig. 21 when reading the following
section )
a) Place switch (A) in the on position "I" to start
the ignition cycle. If the digital timer has been
installed, refer to the instructions for that
device to perform the additional operations.
b)
Turn the room thermostat dial (D) clockwise
to the highest value. This marks the beginning
of the start-up phase, indicated when the
green led (E) turns on.
c) Check that the red led (F) is turned off. If it is
on, this means that the burner control
equipment is in the "lockout" position. In this
case, press the button (C) to reset the control
equipment, and the red light will turn off.
After completing the pre-purge phase (after
about 30 seconds), the system simultaneously
opens the gas solenoid valve and activates the
transformer to discharge the electrode to ignite
the burner.
From the moment in which the burner is ignited,
the flame must be detected by the special
ionisation sensor within the specific safety time,
otherwise the control equipment enters the lock
out mode, indicated when the red led (F).
This may occur in particular in a new plant due
to air in the gas piping. In this case, wait about
one minute and reset the appliance by pressing
the "reset" button (C) to begin a new cycle.
Repeat the operation until the residual air has
Fig. 21
CONTROL PANEL