Navien NHB Series Installation & Operation Manual page 37

3.6.3 Wiring Diagram - Zone Pump System
The NFB Boilers can operate a heating system with up to 3 zones. The following is the wiring diagram for a zone pump system with 3 zones.
Without 24VAC Connections
The rated output of the provided dry contacts are designed to be 5A/120V per each output.
Note
Boiler Pump
Zone Pump 1
Zone Pump 2
Use with dry
contacts only
Zone Pump 3
Pump Ground
Thermostat 1 Thermostat 2 Thermostat 3
Installing the System Piping 37