75Installing a Cascade System
When installing a cascade 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 combi-boiler and water
heaters. The following sections describe additional considerations that are specific to installing cascade systems.
Read them carefully before designing or installing the system.
8.1 Connecting Water Supplies
Several options are available for applying a cascade system of combi-boilers and 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 cascade system.
You can connect up to 1 combi-boiler and 15 Navien water heaters (NPE-A2 or NPE-S2 model) to meet high-
volume water heating demands. Some possible connection options include the following:
Example of a Basic Cascade System Application
Pressure
Relief Valve
Main
Faucet
Ball Valve
Optional System
Temperature Sensor
NaviClean
(recommended)
Ball Valve
<NPE-A2 Series>
<NPE-A2 Series>
Check Valve
Air Separator
with Expansion
Tank
Pump
Heating
Supply
Heating Return
Sub2Sub1
[NCB-H]
8. Installing a Cascade System
To Next Page
Loading...
Need help?
General
