REGULATIONS FOR A CORRECT INSTALLATIONS OF PRESSURE TANKS
OVERPRESSURE PROTECTION:
If the sanitary water installation exceeds the admissible values of pressure of the calorifier, a pressure regulator as far away as possible from the calorifier has to be installed.
• Calorifier with primary circuits fluid with temperature below 110°C
To avoid damaging on products due to sudden changes of pressure, it is always necessary to provide an expansion system, according to “Raccolta R ed. 2009 chapt.. (R-1a)”.
For Water Heater with primary circuit temperature above to boiling secondary fluid at 0.5 bar pressure must have safety devices (termostat, pressurestat, level/min. pressure
protection). This expansion system can simply consist in a safety valve, counterwight, or spring-loaded, which port has to be a diameter in millimetres not lower than:
D min=
where V is Volume of Calorifier in liters, minimum diameter 15mm. The valve must be calibrated at a pressure not exceeding the maximum working pressure of the calorifier
and connected without any shut off device.
Besides the safety valve is however recommended to install a closed expansion vessel with atoxic membrane, in order to avoid a continuous opening of valve.
Cordivari Heat exchangers are manufactured in accordance with 97/23 CE directive and in reference to art. n. 3.3 of this directive they do not have to be marked CE
• Calorifiers with primary circuit supplied by fluid with temperature exceeding 110°C (steam or hot water)
For Water Heater with primary circuit temperature above to boiling secondary fluid at 0.5 bar pressure must have safety devices (termostat, pressurestat, level/min. pressure
protection).
Referring to primary circuit on Heat exchangers the provision on pressure working equipment shall be applied.
For provisions on systems with heat exchangers supplied by fluid with temperature exceeding 110°C