External Recirculation With Navicirc - Navien NaviCirc Installation And Operation Manual

2.4.4 External Recirculation with NaviCirc

The following pump models are recommended for use with the
NCB-H boiler and DHW recirculation systems.
When using the indicated pump models, observe the following
maximum recirculation pipe lengths:
100 feet (30 m) equivalent length of
●
400 feet (120 m) equivalent length of
●
External Recirculation Mode
For best performance, select the Intelligent or Weekly option in the
External recirculation DHW recirculation menu. To use the aquastat
mode, install an aquastat to the DHW pipe line and connect to the
CNC6 terminal on the PCB. (Refer to "3.7.4 Wiring Diagram - Zone
Pump System with DHW Recirculation" in the NCB-H Installation &
Operation Manual.)
Combi pre-heat is the default mode for DHW
Note
recirculation. To select external recirculation, refer to
the combi pre-heat and external recirculation sections
in "2.3.1 Setting the DHW Operation" on page 54 for
details.
/ " copper pipe
1
2
/ " copper pipe
3
4
62
Check
Valve
City Water
Supply