Installation, use and maintenance guide
PIDRA 18
Page
16
ENG
S
VN R
A
VEC
B
O
L
L
IT
O
R
E
AD
IN
TE
RC
A
P
E
D
IN
E
S
S
VM3 VT
VSP
R
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 termostatica punto fisso 55°c
VSP: valvola saracinesca (da parzializzare in funzione delle perdite di carico dell'impianto
schema idraulico - bollitore a intercapedine.dft 03/05/2016
A
P
PA
RE
C
C
H
IO
R
A
5.4 EXAMPLE OF HYDRAULIC DIAGRAM WITH INTERSPACED BOILER COILS OR BOILER COILS
Legenda
Key
BOLLITORE AD INTERCAPEDINE
AIR-CASED BOILER
APPARECCHIO
APPLIANCE
ATTENTION: The water temperature in the boiler tubes in this case is not adjustable and depends on the system's delivery
temperature, that is the temperature set in the generator. The boiler tubes can be installed on the water return circuit. It is
recommended to install a water softener in the domestic water system in order to maintain the boiler at its peak efficiency.
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 plant’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
