Setting The Dip Switches; Dip Switch 1 (6 Switch Unit); Dip Switch 2 (8 Switch Unit) - Navien NFB Series 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). DIP switches are used to control the functionality of the
boiler. Set the DIP switches appropriately, based on the installation
environment.

6.1 DIP Switch 1 (6 switch unit)

The DIP SW 1 on the circuit board configures the operation status
and model/capacity settings.
O
N
1 2 3 4 5 6
Switch Function Setting
Normal Operation
2-stage MAX
Operation
1 & 2
Status
1-stage MIN
1-stage MAX
O
N
1 2 3 4 5 6 7 8
1-OFF, 2-OFF
1-ON, 2-OFF
1-OFF, 2-ON
1-ON, 2-ON

6.2 Dip Switch 2 (8 switch unit)

The DIP SW 2 on the circuit board configures the gas type,
temperature control modes, country, and enables or disables the
space heating thermostat.
O
N
1 2 3 4 5 6
Switch Function Setting
Natural Gas
1 Gas Type
Propane Gas
2 Reserved -
3 Reserved -
4 Reserved -
5 & 6 Country US/Canada
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 or polypropylene piping is used for exhaust
venting.
O
N
1 2 3 4 5 6 7 8
1-OFF
1-ON
-
-
-
5-OFF, 6-OFF
7-OFF
7-ON
8-OFF
8-ON
Setting the DIP Switches 59