SAFETY DEVICES
26
Chapter 8
SAFETY DEVICES FOR OPEN VESSEL PLANT
According to the UNI 10412-2 (2006) Standard, the plants with open expansion vessel must have:
Open expansion vessel
Safety pipe
Feed pipe
Pump control thermostat (excluded for natural circulation plants)
Circulation system (excluded for natural circulation plants)
Acoustic alarm activation device
Acoustic alarm
Temperature indicator
Pressure indicator
Automatic circuit breaker switch (block thermostat)
The temperature safety sensors must be in place on the machine at a distance no greater than 30 cm from
the ow connection.
Whenever the generators lack a device, those missing can be installed on the thermo product ow pipe,
within a distance no greater than 1m from the machine.
SAFETY DEVICES FOR CLOSED VESSEL PLANT
According to the UNI 10412-2 Standard, 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
WATER BOILING SAFETY DEVICE
In case there is scarce amount of water in the boiler
or insu cient heat absorption on behalf of the plant
due to circulation block, overheating until boiling
point of the same water may be caused. A manual
re-arm thermostat block the pellet feed motor. The
manual restoring of the thermostat is carried out by
pressing the buttons located at the rear of the boiler
and covered by screwable caps.
The intervention of the after-sales centre for boiler
over heating is not covered by warranty in case the
machine has not been connected to an adequate
storage, with volume of at least 1000 litres (see
“WARRANTY” chapter).
gure 8.1
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