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The sections of the piping making up the
system must be such as to guarantee a sup-
ply of gas sufficient to cover the maximum
demand, limiting pressure loss between the
gas meter and any apparatus being used to
not greater than:
1. 1.2 mbar (0.5"W.C.) for supply pressures
under 17 mbar (7"W.C.);
2. 2.5 mbar (1.0"W.C.) for supply pressures
fr om 17 mbar (7"W.C.) t o 35 mbar
(14"W.C.).
Gas connections must be made in accordance
with current standards and regulations.
When a vertical section of piping is installed
up stream/side of the boiler, install a sedi-
ment trap at the inlet of boiler, that a sedi-
ment trap must be provided upstream of the
gas control. When dimensioning gas pipes
from the meter to the boiler, both capacity
volume (consumption) in m3/hr (ft3/hr) and
gas density must be taken into account. The
boiler and the boilers gas connection must be
leak tested before it is put in to operation.
The boiler and its individual shut-off valve must
be disconnected from the gas supply piping
system during pressure testing of the system
at pressures in excess of 1/2 psi (3.5 kPa).
The boiler must be isolated from the gas sup-
ply piping system by closing its individual
manual shut off valve during any pressure
testing of the supply piping system at test
pressures equal to or less than 1/2 psi (3.5
kPa). The boiler shall be installed such that the
gas ignition system components are protec-
ted from water (dripping, spraying, rain etc.)
during boiler operation or service (circulators
or control replacement etc.). The boiler and its
gas connection must be leak tested before
placing the the boiler is put into operation.
Use a chloride-free soap and water solution
(bubbles forming indicate a leak) or other
approved method. After placing the boiler in
operation, the ignition system safety shutof f
device must be tested.
To testing the system :
- close the gas valve (gas cock)
- to feed the boiler
9
2
- to verify the ignition of the led "Ignition lock"
- to open the gas cock and to unblock "Reset".
2.2.4 Anti-freeze function
The boilers are equipped with anti-freeze
function which activates the pumps and the
burner when the temperature of the water
contained inside the appliance drops to
below 6°C (43°F). The anti-freeze function
is ensured, however, only if:
- the boiler is correctly connected to the
gas and electricity supply circuits;
- the boiler is constantly fed;
- the boiler ignition is not blocked;
- the essential components of the boiler
are all in working order.
In these conditions the boiler is protected
against frost down to an environmental
temperature of -5°C (23°F).
ATTENTION: In the case of installation in
a place where the temperature drops
below 0°C (32°F), the connection pipes
must be protected.
2.2.5
Condensation drain installation
A siphoned drain must be connected to the
civil drain by a pipe with minimum 6 mm (1/4
in) for every 300 mm (1 foot) for gradient for
condensation collection. Only normal plastic
civil drain pipes are suitable to convey con-
densation to the building's sewer drain.
2.2.6
Gas pipe filter
The gas valve has a standard input filter
which, in any case, is not capable of filtering all
the impurities contained in the gas and mains
piping. To prevent poor valve operatio s or in
certain cases, excluding the valve's safety fea-
tures, we recommend installing a suitable fil-
ter on the gas pipe.
1
7
8
3
4
5
2.3
Filling of the boiler and the system is done by
installing a pressure reducing valve. The char-
ge pressure, with the system cold, must be
between 1 and 1.2 bar (14.5 and 17.4 psi).
During system filling you are recommended to
keep the main switch turned OFF. Filling must
be done slowly so as to allow any air bubbles
to be bled off through the air valves.
Should the pressure have risen well above the
limit expected, discharge the over pressure by
opening the pressure-relief valve.
Bleed pump by loosen plug at back of motor.
Once air is removed retighten plug.
It may be necessary to free the pump motor
before filling the system. This is done by remo-
ving the pump plug and turning the pump
shaft loose. Do not forget to re-tighten pump
plug before filling system. Let off air acting on
the knob 21
fig. 4/a. See following page 10 about "Typical
piping".
OPEN
APRE
2.3. 1 System draining
To drain the system, turn off the boiler and
use the discharge valve (5 fig. 4/b).
KEY
1 D.H.W. flowmeter (white)
2 Sensor effect HALL (blue)
3 --------
4 3 BAR (43.5 psi) safety valve
5 Boiler discharge
6 By-pass (blue)
7 Water pressure transducer
8 Diverter valve
NOTE:
They
blue/white the members for which
are previewed the verification and the
control.
6
SYSTEM FILLING
21
Fig. 4/a
are
evidenced
in
Fig. 4/b
ENG
FR
9
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