63
Installing 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 model) to meet high-volume heating demands. Some possible
connection options include the following:
Example of a Basic Cascade System Application
Pressure
Relief Valve
Air Vent
Main
Faucet
Ball Valve
Optional System
Temperature Sensor
NaviClean
Ball Valve
<NPE Series>
<NPE Series>
Check Valve
Air Separator with
Expansion Tank
Pump
Heating
Supply
Heating Return
Sub2
Sub1
[NFC-175/200]
Note
●
System application drawings are intended to explain the system piping concept only.
●
Install a NaviClean Filter in the system heating return to remove foreign objects from the system. Foreign objects inside the
system may result in abnormal system operation.
●
Refer to “3.4 Filling the System” on page 28 for make-up water connections and refer to the requirements of your local codes
to ensure compliance.
●
Use pumps with integral check valves or install check valves at the pump outlets.
●
Adjust the settings at the main unit as the cascade system uses only the main unit settings. Changes made to the sub units are
ignored.
8. Installing a Cascade System
Summary of Contents for NFC-175
Page 122: ...Memo...
Page 123: ...Memo...
