HYDRAULIC SYSTEM
Certain concepts referring to the Italian Standard UNI 10412-2 (2009) are described in this chapter.
As previously described, when installing, all national, regional, provincial and council Standards in force provided by the country in which the
appliance has been installed must be complied with.
During installation of the generator it is MANDATORY to adjust the system with a manometer in order to display the water pressure.
TABLE OF THE DEVICES FOR CLOSED VESSEL SYSTEMS PRESENT AND NOT PRESENT IN THE PRODUCT
Safety valve
p
Pump control thermostat (it is controlled by the water probe and the board program)
p
Acoustic alarm activation thermostat
Water temperature indicator (display)
p
Pressure transducer with view on the display
p
Acoustic alarm
Automatic adjustment circuit breaker switch (managed by board program)
p
Pressure transducer with minimum and maximum pressure switch alarm
p
Water overheating automatic circuit breaker switch (block thermostat)
p
Circulation system (pump)
p
Expansion system
p
INSTALLATION AND SAFETY DEVICES
The installation, relative system connections, commissioning and inspection of correct functioning must be carried out with the highest
professional standards, in full compliance with the national, regional and council Standards in force, as well as these instructions. For Italy,
installation must be carried out by professionally authorised sta (Ministerial Decree dated 22.01.08 n°37).
The Manufacturer declines all liability for damage/injury to objects/persons caused by the plant.
TYPE OF SYSTEM
There are 2 dierent types of system:
Open vessel system and closed vessel system.
The product has been designed and made to work with closed vessel systems.
CHECK THAT THE PRELOAD OF THE EXPANSION VESSEL IS SET TO 1.5 BAR.
SAFETY DEVICES FOR CLOSED VESSEL SYSTEM
According to Standard UNI 10412-2 (2009)in force in Italy, closed systems must be equipped with: 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 ACCORDING TO THE STANDARD
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 1 m from the machine.
COMMISSIONING CHECKS
Before connecting the boiler:
a) wash all system piping thoroughly in order to remove any residues which might compromise the correct functioning of certain system
components (pumps, valves, etc.).
b) check to verify that the ue has adequate draught, that it is not narrowed and that other appliances do not discharge into the ue. This is to
prevent unexpected power increases. The ue tting can be mounted between the boiler and the ue only after this inspection. An inspection
of the connections with pre-existing ues is recommended.
ANTICONDENSATION DEVICE MANDATORY
Make sure a suitable anti-condensate circuit has been realised, which guarantees an appliance return temperature of at least 55°C. The
automatic thermostatic valve, for instance, is used in solid fuel boilers as it prevents cold water from returning into the exchanger. A high
return temperature allows eciency improvement, reduces formation of smoke condensation and prolongs the generator's life span. The
manufacturer recommends using the 55°C model with 1'' hydraulic connections.
Valve sold as an accessory (optional)
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