Ferroli PEGASUS 23 T Instructions For Use, Installation And Maintenance page 29

Turning off
Press and turn the control knob 1 to position "C" (fig. 2).
Close the gas cock ahead of the boiler.
To avoid damage caused by freezing during
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long shutdowns in winter, it is advisable to
drain all water from the boiler and the system;
or add a suitable antifreeze to the heating sys-
tem.
2.4 Adjustments
System temperature adjustment
Turn the control thermostat 4 (fig. 1) clockwise to increase the heating water tempera-
ture, or anticlockwise to decrease it. The temperature can be varied from a minimum of
30°C to a maximum of 90°C. However, it is advisable not to operate the boiler below
45°C.
Room temperature adjustment (with optional room thermostat)
Set the desired temperature in the rooms with the room thermostat. Controlled by the
room thermostat, the boiler lights and brings the system water to the temperature set by
the control thermostat 4 (fig. 1). The generator goes off when the required temperature
in the rooms is reached.
If the room thermostat is not installed, the boiler will keep the system at the temperature
set by the boiler control thermostat.
System water pressure adjustment
The filling pressure with system cold, read on the boiler water gauge (ref. 1 - fig. 1 ), must
be approx. 1.0 bar. If, during operation, the system pressure falls (due to the evaporation
of gases dissolved in the water) to values below the minimum described above, the User
must bring it to the initial value by operating the filling cock. At the end of the operation
always close the filling cock.
2.5 Maintenance
The user must have the heating system serviced by qualified personnel at least once a
year and combustion checked at least every two years. Consult sec. 4.3 of this manual
for more information.
The boiler casing, panel and aesthetic parts can be cleaned with a damp soft cloth, if nec-
essary soaked in soapy water. Do not use abrasive detergents and solvents.
2.6 Faults
Boiler shutdown due to insufficient evac-
uation of fumes
Before calling the after-sales service, check if problem is due to no gas or pow-
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er.
3. INSTALLATION
3.1 General Instructions
This unit must only be used for its intended
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purpose.
This unit is designed to heat water to a tem-
perature below boiling point at atmospheric
pressure and must be connected to a heating
system and/or a water supply system for do-
mestic use, compatible with its performance,
characteristics 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.
28
EN
PEGASUS 23 T - 32 T - 35 T - 45 T
Unscrew the fume thermostat cover (detail 3 - fig. 1)
and press the button below.
In case of repeated shutdowns, contact the nearest
service centre.
cod. 3541E581 - Rev. 03 - 10/2019
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 the current regulations. To ensure proper operation
and long boiler life, the plumbing system must be adequately sized and complete with all
the necessary accessories.
If the delivery and return pipes follow a path where air pockets can form in certain places,
it is advisable to install vent valves at these points. Also, install a discharge device at the
lowest point in the system to allow its 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 difference between the delivery manifold and the return to the boiler
should not exceed 20°C.
Do not use the water system pipes to earth
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electrical appliances.
Before installation, carefully clean all the system pipes to remove any residuals or impu-
rities that could affect proper operation of the unit.
Carry out the relevant connections as indicated in fig. 13.
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.
Make the boiler connection in such a way that
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its internal pipes are free of stress.
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
Before carrying out the connection, make sure
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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 resi-
dues that could affect proper operation of the
boiler.
The gas must be connected to the relevant connection (see fig. 13) in conformity with
current 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 connec-
tions are tight.
The capacity of the gas meter must be sufficient for the simultaneous use of all applianc-
es 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 current standards.
Do not use the gas pipes to earth electrical
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appliances.