Navien NPE-32AWE, Installation Manual

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38 Insta ll ing a Cas c ading S ystem
When installing a cascading system, carefully consider the design of the system and the features of the installation location. Follow
all local codes and regulations, as well as all guidelines for installing the water heater. The following sections describe additional
considerations that are speci
installing cascading systems. R ead them carefully before designing or installing the system.
4 .1 Connecting W ater S u pp lies
S everal options are available for plumbing a cascading system of water heaters. The options shown here are only examples. The setup
you choose will vary based on the installation location, local building codes, and other factors. Follow all applicable regulations when
installing a cascading system.
You can connect up to 16 water heaters to meet high-volume hot water demands. S ome possible connection options include the
following:
R ecirculation via Internal Pumps (“A” model only):
Communication
Cable
DHW S upply Line
R ecirculation Line
Cold Water S upply Line
Gas S upply Line
Union
Ball Valve
Check Valve
DHW Tap
Expansion Tank
Pressure R elief Valve
[NPE-24AWE, NPE-32AWE]
Note
The recommended minimum recirculati is 7 .5 7 LPM. Depending on the number of water
heaters and the diameter of the recirculation line, it may not be necessary to connect all water heaters to the recirculation
line. If this is the case, set the unconnected water heaters to internal recirculation mode. The master water heater must
always be connected to the recirculation line and set to external recirculation mode.
NPE- S WE:
Communication
Cable
DHW S upply Line
Cold Water S upply Line
Gas S upply Line
Union
Ball Valve
Check Valve
DHW Tap
Expansion Tank
Pressure R elief Valve
[NPE-24SWE, NPE-32SWE]
4 . I nstalling a Cascading S ystem