Installation, use and maintenance guide
PIDRA 18
Page
15
ENG
R
S
A
S
VEC
VM3 VT
A : andata impianto riscaldamento
R : ritorno impianto riscaldamento
S : saracinesca
VNR : valvola di non ritorno
VEC : vaso di espansione chiuso per protezione impianto
VM3VT : valvola miscelatrice punto fisso 55°C
VSP: valvola saracinesca (da parzializzare in funzione delle perdite di carico dell'impianto)
VSP
R
A
A
PP
A
RE
C
C
H
IO
VN R
5.3 HYDRAULIC DIAGRAM WITH HEATING ONLY
Legenda
Key
APPARECCHIO
APPLIANCE
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.
A
Heating plant delivery
VM3VT
Mixing valve set at 55°C
R
Heating plant return
VSP
Gate valve to throttle the flow
S
Gate valve
VNR
Nonreturn valve
VEC
Closed expansion tank as protection for the system