HYDRAULIC SYSTEM
13
ENGLISH
INSTALLATION AND SAFETY 6.1.
DEVICES
The installation, relative system connections, commissioning and
inspection of correct functioning must be carried out perfectly, in
total compliance with Standards in force, both national, regional
and municipal, as well as these instructions.
For Italy, installation must be carried out by professionally
authorised sta (Ministerial Decree dated 22.01.08 n°37).
Extraame S.p.A. declines all responsibility for damages to
objects and/or persons caused by the system.
SAFETY DEVICES FOR CLOSED 6.2.
VESSEL SYSTEM
According to the UNI 10412-2 (2006) Standard in force in Italy,
the closed systems must have: safety valve, pump control
thermostat, acoustic alarm activation thermostat, temperature
indicator, pressure indicator, acoustic alarm, regulation automatic
circuit breaker switch, automatic circuit breaker block 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 6.3.
ACCORDING TO THE STANDARD
Component Distance
Temperature safety sensors
On the machine or not
exceeding 30 cm
Missing devices because not
as per standard
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 generator ow pipe, within a distance no greater
than 1m from the machine. The domestic heating appliances with
automatic feeding must be supplied with a fuel block thermostat
or be supplied with a cooling circuit set-up by the appliance
manufacturer.
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.
ATTENTION! THE COMFORT IDRO MODEL DOES NOT HAVE
EXPANSION VESSEL AND PUMP AS PER STANDARD
HYDRAULIC SYSTEM7.
Certain concepts referring to the Italian UNI 10412-2 (2006) Standard 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 dierent types of system: open vessel system and closed vessel
system. 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.
Automatic closed expansion system with compressor and membrane
impermeable to the passage of gases.
Automatic closed expansion system with transfer pump and membrane
impermeable to the passage of gases.
Expansion system without diaphragm.
GENERALITY
The closed systems 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 ow connection. Whenever the generators lack a
device, those missing can be installed on the generator 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 circuit breaker 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.
Safety valves
The load capacity of the safety valve must allow the discharge of a quantity of vapour,
not lower than: Q / 0.58 [kg/h] where: Q is the useful outlet power to the generator
water expressed in kilowatt. The diameter of the minimum net transversal section of
the valve inlet must not be lower than 15 mm. The valve load pressure, equal to the
calibration pressure, increased by the overpressure, cannot exceed the maximum
exercise pressure of the heat generator. The designer must check that the maximum
pressure existing in every point of the system, does not exceed the maximum
exercise pressure of its every component. The safety valve must be connected to the
highest part of the heat generator or outlet pipes, immediately near the generator.
The length of the pipes route included between the attachment to the generator
and the safety valve must not be higher than 1 m. The connection piping of the
safety valve to the heat generator must not be traceable and must not present, in
any point, section lower to the inlet of the safety valve or the sum of the inlet sections
in case of more valves under the individual pipe. The discharge piping of the safety
valve must be realised in order not to prevent the regular functioning of the valves
and not to cause damages to persons; the discharge must ow immediately near
the safety valve and be accessible and visible. The diameter of the discharge piping
must not however be lower than that of the outlet connection of the safety valve.
For diameter of outlet connection it is intended the minimum internal diameter on
the valve outlet upstream of the eventual internal threading.
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