Navien NFB-175 Mode D'emploi page 63

System Application #3- Cascade System with DHW Indirect Tank (for High DHW Demand)
●
Supply
DHW
Indirect tank
Aquastat
Cold water
In this configuration, the full capacity of all boilers will be prioritized to the DHW demand.
Note
●
The aquastat on the DHW indirect tank must be connected to the main unit.
●
Connect the DHW pump to the main unit.
●
System Application #4- Cascade System with DHW Indirect Tank (for High DHW Demand)
●
Supply
Return
Indirect tank
Aquastat
In this configuration, the full capacity of all boilers will be prioritized to the DHW demand.
Note
●
The aquastat on the DHW indirect tank must be connected to the main unit.
●
Connect the DHW pump to the main unit.
●
Air separator
Cold water
Back flow preventor
Expansion tank
12" (30 cm)
maximum
DHW
Cold water
Temperature
sensors (required)
Dirt collector
Hydro/Air separator
Main
Temperature
sensors (required)
Return
Main
Back flow preventor
Expansion tank
Sub1 Sub2
Sub1 Sub2
Cold water
Installing a Cascade System 63