Installation, use and maintenance guide
BOSKY SQUARE 30
– BOSKY SQUARE F30
Page 18
ENG
5.6 SCHEMATIC DIAGRAM OF TYPICAL CLOSED EXPANSION TANK HYDRAULIC SYSTEM WITH PUFFER
TANK
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:
Anti-condensation mixing valve should be set at approx. 65°C. So when the temperature of the boiler drops below
this value, the “cold” inlet closes and prevents circulation towards the puffer tank but only between the boiler supply and return. In
this way, the heat stored in the puffer tank is not dispersed to the boiler.
A
Supply to the puffer tank
STS
Safety heat exchanger
(standard only in the READY TO START version)
ACQ
Water main inlet
VEC
Additional closed expansion tank, sized to at least 10% of
the volume of water contained in the system
PC
Circulating pump
(standard only in the READY TO START version)
VNR
Nonreturn valve
R1
Return from the puffer tank
VM3VT
Anti-condensation mixing valve
S
On-off valve
VS
Safety valve 3 bar
(standard only in the READY TO START version)
SC
Gate valve
(throttle according to pressure drop in the system)
VST
Thermal relief valve
(standard only in the READY TO START version)
SCA
Discharge
R
System return if integrated with a solar system
BOSKY VASO CHIUSO -+ PUFFER
VNR
VEC
VST
ACQ
VM3VT
SC
VNR
S
SCA
VS
A
R
S
S
S
COLD
MIX
H
O
T
R1
PC
STS