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A recommended scheme for cascade installation is as follow:
Purge Drain
Outdoor air
sensor
Auto-Fill
Air
Eliminator
Condensate
drain
Room
Thermostat
Expansion
Tank
Relief valve
and
pressure
gauge
Back-flow
preventer
Shut-off
valve
Temperature
Circulator
Fig. 81
SSB
Heating
Tank
Return
return
Indirect tank sensor
(tank not shown)
2
5
8
Managing
Boiler
3
(optional)
1
4
Boiler gas valve,
premix fan,
and heat exchanger.
9
Dependent
Boiler
Installation schemes | 51
Indirect
Heating
Tank
zone
6
7
6720818456 (2018/06) US
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