Installation, use and maintenance guide
ARDHEA EVO5
– ARDHEA-F EVO5
Page
14
ENG
5.4 SCHEMATIC DIAGRAM OF TYPICAL CLOSED EXPANSION TANK HYDRAULIC SYSTEM
ATTENTION: it is mandatory to earth the generator. If this instruction is not observed serious damage, which
is not covered by warranty, will result to the body of the appliance. Have a skilled electrician check the
earthing. There must be no electric pote
ntial (Volt) between the generator earth and the system’s real earth
(earth plate). To prevent electrochemical corrosion of the appliance body do not use galvanised pipes and
fittings. Other materials must be earthed with special earthing cables in order to obtain a unipotential
earthing system.
ATTENTION:
It is important to guarantee that the boiler return temperature always exceeds 55°C. For this reason we recommend
installing a temperature control thermometer on the return. Act on the head of the mixing valve to adjust the temperature.
A
Heating plant delivery
SCS
Safety heat exchanger
ACQ
Water main inlet
VEC
Additional closed expansion tank, sized to at least 10% of
the volume of water contained in the system
PC
System circulating pump
VM3VT
Anti-condensation mixing valve
R
Heating plant return
VNR
Nonreturn valve
S
On-off valve
VS
Safety valve 3 bar
SC
Gate valve
(throttle according to pressure drop in the system)
VST
Thermal relief valve
SCA
Discharge
VASO CHIUSO
VNR
VEC
ACQ
VM3VT
SC
VNR
S
SCA
VS
A
R
VST
SCS
PC