1-Stage Thermostat / 1-Stage Control Heating System; 2-Stage Thermostat / 2-Stage Control Heating System - Navien H2Air Installation Manual

3.1.2 1-Stage Thermostat / 1-Stage Control Heating System

Set DIP switch (SW) #3 to 'Off' to configure the system to use a 1-stage thermostat
/ 1-stage control.

3.1.3 2-Stage Thermostat / 2-Stage Control Heating System

Set DIP switch (SW) #3 to 'On' to configure the system to use a 2-stage thermostat
/ 2-stage control.
Wiring the Device 15