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HYDRAULIC PLANT CONNECTION
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 normatives 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 TC30 boiler can work with both types of plant.
OPEN VESSEL PLANT
Plant where the water contained therein is in direct or indirect communication with the atmosphere,
equipped with open expansion vessel, positioned at the peak of the plant, in communication with the
atmosphere through appropriate venting pipe.
GENERALITY
Plants with open expansion vessel must be equipped with:
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 fl ow connection.
Whenever the generators lack a device, those missing can be installed on the generator fl ow pipe, within
a distance no greater than 1m from the machine.
OPEN EXPANSION VESSEL
The expansion vessel must have useful capacity (meaning the volume included between the water level
with inactive plant and the water level in correspondence to the lower generator of the too full orifi ce) not
lower than the expansion volume.
The plant water content must result from the project.
The expansion vessel must be constituted by a covered recipient, located above the highest point reached
by water, at a height suffi cient to ensure a higher pressure of the atmospheric pressure in such point,
during the normal functioning of the plant.
The expansion vessel must be equipped with a venting pipe communicating with the atmosphere of a
section at least equal to that of the safety pipe. The too full pipe must have a visible discharge and progress
with downwards slope.
HYDRAULIC PLANT CONNECTION
Chapter 4
Chapter 4
17
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