Bosch SSB255 - Page 51

SSB 6720818454 (2016/02) US
Applications | 51
A recommended scheme for cascade installation is as follow:
Fig. 80
Expansion
Tank
Auto-Fill
Air
Eliminator
Shut-off
valve
Condensate
drain
Outdoor air
sensor
Room
Thermostat
Supply
sensor
Circulator
Purge Drain
Relief valve
and
pressure
gauge
Back-flow
preventer
Indirect
Tank
Heating
zone
Heating
Return
Indirect
return
Primary
Bolier
Secondary
Bolier
(optional)
Indirect tank sensor
(tank not shown)
8
2
9
1
76
3
4
5