Navien NFB-301C User Manual

70 Installing a Cascade System
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System Application #6- Cascade System with DHW Indirect Tank (for Low DHW Demand)
12” 30 cm
maximum
Sub2
Sub1
Main
Temperature
sensors (required)
Cold water
Cold water
DHW
Supply
Return
Back flow preventor
Expansion tank
Indirect
tank
Aquastat
Air separator
Note
Ɣ
In this configuration, space heating and DHW can operate simultaneously.
Ɣ
The aquastat on the DHW indirect tank must be connected to a sub unit.
Ɣ
If a dedicated sub unit is used, the input capacity requirement of the indirect tank shall not exceed the capacity of the single boiler.
Ɣ
Connect the DHW pump to the sub unit.
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System Application #7 - Cascade System with DHW Indirect Tank (for Low DHW Demand)
Temperature
sensors (required)
Sub2
Sub1
Main
Cold water
Cold water
DHW
Supply
Return
Hydro/Air separator
Dirt collector
Back flow preventor
Expansion tank
Indirect
tank
Aquastat
Note
Ɣ
In this configuration, space heating and DHW can operate simultaneously.
Ɣ
The aquastat on the DHW indirect tank must be connected to a sub unit.
Ɣ
If a dedicated sub unit is used, the input capacity requirement of the indirect tank shall not exceed the capacity of the single boiler.
Ɣ
Connect the DHW pump to the sub unit.

Navien NFB-301C Specifications

General

Brand	Navien
Model	NFB-301C
Category	Boiler
Language	English