SAFETY DEVICES
15
Chapter4
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
DISTANCES OF SAFETY DEVICES ACCORDING TO THE STANDARD
Component Distance
Temperature safety sensors On the machine or not exceeding 30 cm
Devices missing because not standard (see table
on next page)
Not exceeding one metre, on the ow pipe
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.
The domestic heating appliances with automatic feeding must:
be equipped with a fuel block thermostat ( gure 4.1, 4.3), or
be equipped with a cooling circuit prepared by the manufacturer of the appliance.
The cooling circuit must be activated by a heat safety valve such 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.
AUTOMATIC THERMOSTATIC MIXER VALVE MANDATORY
The automatic thermostatic mixing valve is applied in solid fuel boilers as it prevents cold water return in the
exchanger ( gure 4.8).
Routes 1 and 3 are always open and, together with the pump installed on the return, they guarantee water
circulation inside the biomass boiler exchanger.
An elevated return temperature, allows e ciency improvement, reduces formation of smoke condensation
and prolongs the boiler life span.
Valves on the market have di erent calibrations. Extra ame advises use of model 55°c with 1” hydraulic
connections. Once the valve calibration temperature is reached, route 2 is opened ad the boiler water goes
to the system via the ow.
Extra ame recommends not to use this device whenever the DHW is produced through an instant heat
exchanger.
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