Extraflame LUCREZIA IDRO - Safety Devices for Open Tank Systems; Safety Devices for Closed Tank Systems

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4.12 Safety devices for open expansion tank system
According to the UNI 10412-2 (2006) regulation, in force in Italy, systems with open expansion tank must be
equipped with:
• Open expansion tank
• Safety tube
• Loading tube
• Thermostat for circulator control (excluded for systems with natural circulation)
• Circulation system (excluded for systems with natural circulation)
• Device for acoustic alarm activation
• Acoustic alarm
• Temperature indicator
• Pressure indicator
• Automatic cut-out switch (cut-out thermostat)
The temperature safety sensors must be on-board the heat generator or at a distance no greater than 30 cm
from the delivery connection.
If the heat generators are not equipped with all the devices, the missing ones can be installed on the
delivery piping of the generator, at a distance of no more than 1 m from it.
4.13 Safety devices for closed tank system
According to the UNI 10412-2 (2006) regulation, in force in Italy, systems with closed expansion tank must
be equipped with:
• Safety valve
• Circulator control thermostat
• Acoustic alarm activation thermostat
• Temperature indicator
• Pressure indicator
• Acoustic alarm
• Automatic thermal adjustment switch
• Automatic thermal cut-out switch (cut-out thermostat)
• Circulation system
• Expansion system
• Safety dissipation system incorporated into the generator with the blowdown valve (self-operated),
if the appliance is not equipped with a self-regulating temperature system
The temperature safety sensors must be on-board the heat generator or at a distance no greater than 30 cm
from the delivery connection.
If the generators are not equipped with all the devices, the missing ones can be installed on the delivery
piping of the generator, at a distance of no more than 1 m from the machine.
Domestic type automatic loading heating appliances must be equipped with a fuel blocking thermostat or a
cooling circuit provided by the manufacturer of the appliance, activated by a thermal safety valve in order to
guarantee that the temperature limit imposed by the regulation is not exceeded. The connection between
the power supply unit and the valve must not have interceptions. The pressure upstream from the cooling
circuit must be at least 1.5 bar.