Ferroli PEGASUS LN 2S Série Instructions D'utilisation, D'installation Et D'entretien page 27

PEGASUS LN 2S
If the system delivery and return pipes follow a path where air pockets could form in cer-
tain places, it is advisable to install vent valves at these points. Also, install a discharge
device in the lowest part of the system to allow complete emptying.
If the boiler is installed at a lower level than the system, it is advisable to provide a flow-
stop valve to prevent the natural circulation of water in the system.
The temperature drop between the delivery manifold and the return to the boiler should
not exceed 20°C.
B
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove any residuals or
impurities that could affect proper operation of the unit.
Carry out the relevant connections as indicated in fig. 2.
It is advisable to install shut-off valves between the boiler and heating system allowing
the boiler to be isolated from the system if necessary.
B
Make the boiler connection in such a way that its internal pipes are free of
stress.
Boiler connections
A
C
fig. 2 - Connections
Table. 1
Type and model A C
PEGASUS 67 LN 2S 760 180
PEGASUS 77 LN 2S 850 200
PEGASUS 87 LN 2S 930 200
PEGASUS 97 LN 2S 1020 200
PEGASUS 107 LN 2S 1100 220
Water system characteristics
In the presence of water harder than 25° Fr, it is advisable to use suitably treated water,
in order to avoid possible scaling in the boiler caused by hard water, or corrosion pro-
duced by aggressive water. Due to its low thermal conductivity, scaling even just a few
mm thick causes significant overheating of the boiler walls with consequent serious prob-
lems.
Water treatment is indispensable in case of very large systems (containing large
amounts of water) or with frequent introduction of replenishing water in the system. If par-
tial or total emptying of the system becomes necessary in these cases, it is advisable to
refill with treated water.
Filling boiler and system
The filling pressure with system cold system must be approx. 1 bar. If, during operation,
the system pressure falls (due to the evaporation of gases dissolved in the water) to val-
ues below the minimum described above, the user must bring it to the initial value. For
correct operation of the boiler, when hot, its pressure must be approx. 1.5-2 bar.
3.4 Gas connection
B
Before carrying out the connection, make sure the unit is arranged for using the
type of fuel available and carefully clean all the pipes of the gas system to re-
move any residues that could affect proper boiler operation.
The gas must be connected to the relevant connection (see fig. 2) in conformity with cur-
rent standards, with a rigid metal pipe or with a continuous surface flexible s/steel tube,
installing a gas cock between the system and boiler. Make sure all the gas connections
are tight.
The capacity of the gas meter must be sufficient for the simultaneous use of all equip-
ment connected to it. The diameter of the gas pipe leaving the boiler does not determine
the diameter of the pipe between the unit and the meter; it must be chosen according to
its length and pressure losses, in conformity with the current regulations.
B
Do not use the gas pipes to earth electrical appliances.
E
a2
a3
D
a1
F
a1 a2
D E F Heating System
return delivery
41 42 32 1" 1/4 1" 1/4
43 44 34 1" 1/4 1" 1/4
40 41 31 1" 1/4 1" 1/4
43 43 33 1" 1/4 1" 1/4
40 40 30 1" 1/4 1" 1/4
cod. 3540S240 - 03/2009 (Rev. 00)
3.5 Electrical connections
Connection to the power supply
The boiler must be connected to a single-phase, 230 Volt-50 Hz electric line .
B
Electrical safety is guaranteed only when the unit is correctly connected to an
efficient earthing system complying with the current safety standards. Have the
efficiency and suitability of the earthing system checked by professionally qual-
ified personnel; the Manufacturer declines any liability for damage caused by
failure to earth the system. Also make sure the electrical system is adequate for
the maximum power absorbed by the unit, specified on the boiler dataplate, in
particular ensuring that the section of the system cables is suitable for the pow-
er input.
The boiler is prewired and supplied with a connector located inside the control panel, ar-
ranged for connection to an electronic thermostatic controller (see wiring diagrams in
par. 4.5). It is also equipped with a three-core cable for connection to the electric line.
Connections to the mains must be made with a permanent connection and a double-pole
switch with contacts having an opening gap of at least 3 mm, installing fuses of max. 3A
between the boiler and the line. Make sure to respect the polarities (LINE: brown wire /
NEUTRAL: blue wire / EARTH: yellow/green wire) when making connections to the elec-
tric line.
Accessing the electrical terminal block and internal components of the control
panel
To access the electrical components inside the control panel, follow the sequence in
fig. 3. The layout of the terminals for the various connections is given in the wiring dia-
grams in the technical data section.
a3
Gas
fig. 3 - Accessing the terminal block
inlet
Key
3/4"
A Undo the 2 self-tapping screws securing the boiler cover.
3/4"
B Lift by pressing upwards and remove the cover held to the sides of the boiler by
3/4"
pins.
3/4"
C Undo and remove the two screws and the two plates holding the control panel.
3/4"
D Turn the control panel forwards.
Any additional sensitive elements of the system control and safety devices, temperature
sensor, pressure switch, thermostat bulb, etc., must be located on the delivery pipe with-
in 40 cm of the boiler casing rear wall (see fig. 4).
Key
A System delivery
B System return
C 40 cm max.
A
B
3.6 Connection to the flue
The flue connection pipe diameter must not be less than that of the connection on the
anti-backflow device. Starting from the anti-backflow device it must have a vertical sec-
tion at least 50 cm long. Comply with the current regulations regarding installation and
sizes of the flues and connection pipe.
The diameters of the anti-backflow device collars are given in table 1.
4. SERVICE AND MAINTENANCE
C
fig. 4 - Delivery and return
EN
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