SAFETY DEVICES
11
Chapter 3
SAFETY DEVICES FOR CLOSED VESSEL PLANT
According to the UNI 10412-2 (2006) Standard in force in Italy, the closed plants must have:
Safety valve
Pump control thermostat
Acoustic alarm activation thermostat
Temperature indicator
Pressure indicator
Acoustic alarm
Adjustment automatic circuit breaker switch
Automatic circuit breaker switch (block thermostat)
Circulation system
Expansion system
Safety dissipation system incorporated with the generator with thermal safety valve (self-activated),
whenever the appliance does not have a temperature self-adjustment system
The temperature safety sensors must be in place on the machine at a distance no greater than 30 cm from
the fl ow connection.
Whenever the generators lack a device, those missing can be installed on the thermo product fl ow pipe,
within a distance no greater than 1m from the machine.
Domestic type heating appliances with automatic feed must have a fuel block thermostat or a cooling
circuit prepared by the manufacturer of the appliance, activated by a thermal safety valve such as to
guarantee that the limit temperature set by the Standard is not exceeded. Connection between the power
supply unit and the valve must be free from interceptions. The pressure upstream from the cooling circuit
must be at least 1.5 bar.
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