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HYDRAULIC SYSTEM
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Chapter 6
HYDRAULIC SYSTEM
Certain concepts referring to Italian normative UNI 10412-2 (2006) are described in this chapter. As
previously described, when installing, all national, regional, provincial and town council Standards in force
provided by the country in which the appliance has been installed must be complied with.
TYPE OF SYSTEM
There are two diff erent types of plant: Open vessel plant and closed vessel plant.
The product has been designed and realised to work with closed vessel systems.
CLOSED VESSEL SYSTEM FOR AUTOMATIC LOADING APPLIANCES
System in which the water it contains is not in direct or indirect communication with the atmosphere.
Generally, the closed vessel system has one of the following expansion vessels:
Pre-loaded closed expansion vessel with membrane impermeable to the passage of gases.
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Automatic closed expansion system with compressor and membrane impermeable to the passage of
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gases.
Automatic closed expansion system with transfer pump and membrane impermeable to the passage
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of gases.
Expansion system without diaphragm.
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GENERALITY
The closed plants must have:
Safety valve
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Pump control thermostat
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Acoustic alarm activation thermostat
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Temperature indicator
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Pressure indicator
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Acoustic alarm
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Adjustment automatic circuit breaker switch
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Automatic circuit breaker switch (block thermostat)
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Circulation system
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Expansion system
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Safety dissipation system incorporated with the generator with thermal safety valve (self-activated),
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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.