Adisa NEO FIRE 120, Technical Manual Of Installation, Use And Maintenance

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NEO FIRE – Technical Manual
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Heating circuits with a main loop to which are connected A.H.U., fan-coils, where there are the control
el valves. This loop will have enough water capacity to ensure a constant water flow to the boilers.
Renovation of old boilers rooms (previously located in the basement) which have been moved to the top of
the building or terrace, where the flow and the return piping connecting the new boilers room to the old one
have a sufficient water capacity to guarantee a constant water flow, without interruption, through the boiler.
See system drawings.
16.7.5 Water quality of the installation
It is important to follow the instructions indicated in the present manual. The primary circuit of an installation,
being a closed circuit, can not be refilled with non-treated water.
Periodical refillings with non-treated water could cause a constant input of:
Oxygen and dissolved gases (contributing to produce oxidation and corrosion in the installation). This problem
can be minimized by installing an air/gas venting in the higher part of the water flow connection or in a
common flow pipe.
Carbonates (contributing to produce scaling in the boilers).
Due to this reason, water refillings must be reduced to the minimum, and a water meter must be installed in
the refilling of the primary circuit.
It is necessary to take the appropriate precautions with respect to the quality of the water circulating, in order
to avoid corrosion and oxidation of the installation and allow equipments to operate at their maximum
performances:
a) Water characteristics
These are the values of the circuit water and of the refilling water.
The PH should be kept between 7 and 8,5
Hardness of water:
The maximum water hardness can be calculated as: 196 x Power (kW) / Volume installation (l)
The maximum hardness of the water in the installation should be below 30ºF
Examples:
Power [kW]
78 156 273
Volume installation[l] max ºF max ºF max ºF
1500 10,2 20,4 30,0
2500 6,1 12,2 21,4
4000 3,8 7,6 13,4
8000 2 3,8 6,7
Conductivity Lower than 100 µS/cm
The maximum volume allowed of refilling waterduring the life time of the heat exchanger in the installation is
10 litres/kW x [kW]