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11 - OPERATING
11.1.4 - Filling the
domestic hot water
heat exchanger
Once the heating system has been
fi lled and purged, the domestic hot
water heat exchanger must be fi lled
as follows:
1. connect a rubber tube to the
pressure coupling "A" shown in
fi gure 31 and place the end in an
empty bucket or sink;
2. loosen screw "A" as shown in fi gure
31 until air can be heard escaping;
3. once the water runs clear of air
bubbles tighten screw "A";
4. remove the tube and check that
there are no water leaks.
11.1.5 – Auto-
purging the heating
system
Each time the on/off power switch,
item "34" in fi gure 1, is switched
on, an auto-purging cycle lasting 3
minutes begins. The auto-purging
process involves the turning the pump
on and off in order to remove any air
trapped in the heating system. Before
starting the auto-purging cycle the
automatic air vent, item "1" shown in
fi gure 1 must be opened.
11.2 - General
warnings
concerning gas
supply
When starting up the boiler for the fi rst
time the following must be checked:
That the boiler is supplied with the
type of fuel that it is confi gured to
use. Read sections 11.3 and 11.4
That the gas supply pressure is
within the maximum and minimum
values given in listed on the
boiler rating plate. The gas supply
pressure must be checked with
boiler on and the boiler off.
That the gas supply system is
provided with all the safety devices
and controls required under current
national and local codes.
That the vent and combustion
air terminals are free from any
blockages.
That the condensate drain tube is
properly connected.
WARNING!!! If you smell gas:
Do not try to light any appliance.
Do not touch any electrical
switch. Do not use any phone in
your building.
Immediately call your gas
supplier from a neighbor's
phone. Follow the gas supplier's
instructions.
If you cannot reach your gas
supplier, call the fi re depart-
ment.
Failure to follow the above steps
can result in a fi re or explosion
causing property damage, personal
injury or loss of life!
11.3 - Confi rming
the boiler's gas
type
The type of gas and the gas supply
pressure that the boiler is set up for is
listed on the rating label.
The boiler can operate using one of
the following two gases:
NATURAL GAS
Maximum supply pressure = 11
in.W.C. (27.5 mbar).
Minimum supply pressure = 1.5
in.W.C. (3.8 mbar).
LP Gas
Maximum supply pressure = 13
in.W.C. (32.5 mbar).
Minimum supply pressure = 8 in.W.C.
(20 mbar).
11.4 - Gas type
conversion
If the gas available at the installation
site is not the type the boiler is
confi gured to use, the boiler must be
converted. Special conversion kits
are available for this purpose. The
instruction inside the conversion kit
must be followed.
39
WARNING!!! Conversion of the
boiler to use another type of gas
must be carried out by a qualifi ed
technician. Improper conversion
of the gas valve could result in a
fi re or an explosion causing severe
personal injury or death!
11.5 - Start-up
1. Open the manual gas shut off
valve, fi gure 13, item "3".
2. Switch the on/off power switch, item
"34" in fi gure 1, to "on".
3. If the display shows code E 21,
it means that the polarity has not
been observed between the hot
and neutral wires. If this happens
the wires must be switched.
4. Upon start-up, an
is shown for
3 minutes while the boiler goes
through its heating system purge
cycle as described in section
11.1.5. To by-pass this stage, press
the
and
until a blinking
appears.
Then press the
5. Rotate knobs "32" and "33"
shown in fi gure 1 to the desired
temperature.
6. The boiler will fi re only when
the room thermostat calls for
heat. If an external temperature
sensor is connected, check that
the temperature calculated is
higher than the minimum running
temperature as explained in section
12.10.
7. If the pump indicator is illuminated,
item "6" in fi gure 39, but the pump
is not running, item "45" in fi gure 1,
it may be stuck. If this is the case it
can be released by removing screw
"44" shown in fi gure 1 and turning
the screw underneath.
8. If the pump indicator is illuminated
but the heating system does not
heat up, repeat the air purging
operations on both the boiler and
the heating system.
keys together
button.
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