Installation, use and maintenance guide
PIDRA 18
Page
19
ENG
5.7 INSTRUCTIONS FOR EXECUTING THE HYDRAULIC SYSTEM CLOSED EXPANSION TANK
To install the system with a closed expansion tank refer to the requirements laid down in EN 10412-2:2009 for appliances with
nominal heat output not exceeding 35 kW or in the Ministerial Decree Collection R edition 2009 for appliances with nominal heat
output exceeding 35kW. The hydraulic system must be installed by qualified personnel who are familiar with the standards
mentioned above and who have the appropriate professional requirements to release the declaration of conformance in accordance
with Ministerial Decree n° 37 of 22 January 2008.
The generator is already supplied with the following safety devices on board:
a) closed expansion tank for generator protection only*
b) ordinary safety valve 3 bar, not I.S.P.E.S.L. approved
c) an automatic reset temperature limiting device:
this is an automatic adjustment device that interrupts the fuel supply to the generator when the water reaches the temperature
setting. The system starts up again automatically when the water temperature drops below the preset value
d) a manual reset temperature limiting safety device:
this is an automatic device that interrupts the fuel supply when the water reaches the maximum permissible temperature. The fuel
infeed will only restart when the water temperature drops below a preset value and after the device has been reset manually
e) circulation system:
the appliance is fitted with a circulating pump connected to t
he return pipes which is controlled directly by the generator’s control
board.
*
An additional closed expansion tank must be series-connected to the generator as protection for the system.
The nominal volume of the additional closed expansion tank must be sized in relation to the volume of expansion of the water
contained in the system. Thermorossi prescribes that the size of the additional closed expansion tank must be equal to 10% of the
water contained in the system.
The previous chapter does not replace the above standards to which it makes reference. The qualified installer must in
any case be fully aware of the above standards and their amending versions.
