General Instructions; Place Of Installation; Plumbing Connections; Important - Ferroli PEGASUS LN 2S Serie Instructions D'utilisation, D'installation Et D'entretien

PEGASUS LN 2S
3. INSTALLATION

3.1 General Instructions

B
This unit must only be used for its intended purpose.
This unit is designed to heat water to a temperature below boiling point at at-
mospheric pressure and must be connected to a heating system and/or a water
supply system for domestic use, compatible with its performance, characteris-
tics and its heating capacity. Any other use is considered improper.
THE BOILER MUST ONLY BE INSTALLED BY QUALIFIED PERSONNEL, IN AC-
CORDANCE WITH ALL THE INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL,
THE PROVISIONS OF CURRENT LAW, ANY LOCAL REGULATIONS AND THE
RULES OF PROPER WORKMANSHIP.
The Manufacturer declines any liability for damage or injury caused by incorrect installa-
tion.

3.2 Place of installation

This unit is an "open chamber" type and can only be installed and operated in perma-
nently ventilated rooms. An insufficient flow of combustion air to the boiler will affect its
normal operation and fume evacuation. Also, the fumes forming in these conditions (ox-
ides) are extremely harmful to the health if dispersed in the domestic environment.
Therefore the place of installation must be free of dust, flammable materials or objects
or corrosive gases. The room must be dry and not subject to freezing.
When positioning the boiler, leave sufficient space around it for normal maintenance ac-
tivities.

3.3 Plumbing connections

Important

The heating capacity of the unit must be previously established by calculating the build-
ing's heat requirement according to current regulations. For proper operation and long
life of the boiler, the plumbing system must be adequate and always complete with all
the accessories that guarantee regular operation and running.
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
fig. 2 - Connections
All manuals and user guides at all-guides.com
Table. 1
Type and model
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
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

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
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
sec. 5.5). It is also equipped with a three-core cable for connection to the electric line.
The connections to the power supply must be made with a permanent connection and
equipped with a double-pole switch with contact gap of at least 3 mm, interposing fuses
of max. 3A between the boiler and line. It is important to respect the polarities (LINE:
brown wire / NEUTRAL: blue wire / EARTH : yellow/green wire) when making the con-
nections to the electric line.
cod. 3540T612 - Rev. 01 - 02/2015
A C
PEGASUS 119 LN 2S 930 220
PEGASUS 136 LN 2S 1020 250
PEGASUS 153 LN 2S 1100 250
PEGASUS 170 LN 2S 1190 300
PEGASUS 187 LN 2S 1270 300
PEGASUS 221 LN 2S 1440 300
PEGASUS 255 LN 2S 1610 350
PEGASUS 289 LN 2S 1780 350
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.
Do not use the gas pipes to earth electrical appliances.
The unit's electrical safety is guaranteed only when it is correctly connected to
an efficient earthing system in conformity with the current safety regulations.
Have the efficiency and suitability of the earthing system checked by profes-
sionally qualified 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, as specified on the boil-
er dataplate, in particular ensuring that the section of the system's cables is
suitable for the input.
D E a1 a2
Heating System
return delivery
50 42 2" 2"
53 45 2" 2"
58 43 2" 2"
60 46 2" 2"
58 44 2" 2"
57 45 2" 2"
62 46 2" 2"
66 49 2" 2"
EN
a3
Gas
inlet
1"
1"
1" 1/2
1" 1/2
1" 1/2
1" 1/2
1" 1/2
1" 1/2
29