Gas Connection - Ferroli Pegasus LN 2S Serie Mode D'emploi, Installation Et Entretien

It is advisable to install on-off valves between the boiler and heating system
allowing the boiler to be isolated from the system if necessary.
Make the boiler connection in such a way that its internal pipes are
free of stress.
Type and model A
Pegasus 119 LN 2S 930
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
Characteristics of the water system
In the presence of water harder than 25° Fr, we recommend the use of suitably conditioned water in order to
avoid possible scaling in the boiler, caused by hard water, or corrosion produced by aggressive water. It should be
remembered that, because of its low thermal conductivity, even scaling of just a few mm thick causes significant
overheating of the boiler walls with consequent serious problems.
Water treatment is indispensable in the case of very large systems (containing large amounts of water) or with fre-
quent introduction of replenishing water in the system. If partial or total emptying of the system becomes necessary
under these conditions, it is advisable to refill it with treated water.
Filling boiler and system
The filling pressure with system cold system must be about 1 bar. If, during operation, the system pressure falls
(caused by evaporation of gas dissolved in the water) to a value below the minimum described above, the user
must bring it back to the initial value. For correct operation of the boiler, when hot, its pressure must be about
1.5-2 bar.

2.4 Gas connection

Before making the connection, ensure that the unit is arranged for operation with the type of fuel available
and carefully clean all the pipes of the gas system to remove any residues that could affect good functioning
of the boiler.
The gas must be connected to the relative connector (see fig. 2) in conformity with current standards, with rigid
metal pipes or with continuous flexible s/steel wall tubing, placing a gas cock between the system and the boiler.
Make sure that all the gas connections are tight.
The capacity of the gas meter must be sufficient for the simultaneous use of all equipment 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 loss of head, in conformity with current standards.
Do not use the gas pipes to earth electrical appliances.
30
a1
C D E Heating
system return
220 50 42 2"
53 45 2"
58 43 2"
60 46 2"
58 44 2"
57 45 2"
62 46 2"
66 49 2"
Cod. 3540G310 - 03/2007 (Rev. 02)
a2
a3
Heating
Gas inlet
delivery
2" 1"
2" 1"
2" 1" 1/2
2" 1" 1/2
2" 1" 1/2
2" 1" 1/2
2" 1" 1/2
2" 1" 1/2
fig. 2
Pegasus LN 2S
Rear View
EN