Setting The Dip Switches; Pcb Dip Switches - Navien NHB-055 Installation & Operation Manual

6. Setting the DIP Switches

CAUTION
Do not remove the front cover unless the power to the
boiler is turned off or disconnected. Failure to do so may
result in electric shock.
The boiler has 2 sets of DIP switches on the main circuit board
(PCB) and 2 sets of DIP switches on the front panel. DIP switches
are used to control the functionality of the boiler. Set the DIP
switches appropriately, based on the installation environment.

6.1 PCB DIP Switches

DIP Switch 1 (6 switch unit)
The DIP SW 1 on the circuit board configures the operation status
and model/capacity settings.
ON
1 2 3 4
Switch Function
Operation
1 & 2
Status
48 Setting the DIP Switches
ON
5 6 1 2 3 4 5 6 7 8
Setting
Normal Operation 1-OFF, 2-OFF
2-stage MAX 1-ON, 2-OFF
1-stage MIN 1-OFF, 2-ON
1-stage MAX 1-ON, 2-ON
Dip Switch 2 (8 switch unit)
The DIP SW 2 on the circuit board configures the temperature
control modes, country, and enables or disables the space heating
thermostat.
ON
1 2 3 4 5 6
Switch Function Setting
Supply Temperature
Return Temperature
System Supply
Space Heating
Temperature (with
1 & 2 Temperature
optional sensor)
Control
System Return
Temperature (with
optional sensor)
DHW Supply
Temperature
DHW Tank
3 Temperature
DHW System Supply
Control
Temperature (with
optional sensor)
Used
Space Heating
7
Thermostat
Unused
Exhaust Used
8 Temperature
Unused
Control
When PCB DIP switch 2 #8 is set to On, ensure that
Note
CPVC piping is used for exhaust venting.
ON
1 2 3 4 5 6 7 8
1-OFF, 2-OFF
1-ON, 2-OFF
1-OFF, 2-ON
1-ON, 2-ON
3-OFF
3-ON
7-OFF
7-ON
8-OFF
8-ON