Installation, use and maintenance guide
BOSKY SQUARE 30
– BOSKY SQUARE F30
Page 17
ENG
5.5 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 potential (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
VEC
Additional closed expansion tank, sized to at least 10% of
the volume of water contained in the system
ACQ
Water main inlet
VNR
Nonreturn valve
R
Heating plant return
VM3VT
Anti-condensation mixing valve
S
On-off valve
VS
Safety valve 3 bar
(standard only in the READY TO START version)
SCA
Discharge
VST
Thermal relief valve
(standard only in the READY TO START version)
STS
Safety heat exchanger
(standard only in the READY TO START version)
PC
Circulating pump
(standard only in the READY TO START version)
BOSKY VASO CHIUSO
VEC
VST
ACQ
VM3VT
VNR
S
SCA
VS
A
R
PC
STS
