Beretta POWER MAX BOX 130-2 P Installation Manual page 28

Block diagram 2: Circuit with thermal modules with their own circulator, connected in cascade. Using the secondary sensor.
SE
Thermal module circulator
PC
Storage cylinder circulator
PB
DHW circulation pump
PR
System circulator (high temperature zone)
PI
Zone 2 circulator (low temperature)
P2
Zone 3 circulator (low temperature)
P3
Zone 2 sensor
S2
Zone 3 sensor
S3
Boiler sensor
SB
28 Outdoor sensor
SE
Depending
PC
P
SS
ZM
V2
M
SC
V3
M
EAF
Primary sensor
SS
Secondary sensor
SC
Mixer valve zone 2
V2
Mixer valve zone 3
V3
Electronic device for zone management (accessory)
ZM
Domestic cold water inlet
EAF
Domestic hot water outlet
UAC
PB
PI
P2 S2
SB
P3 S3
EAF
UAC
PR