Setting The Dip Switches; Dip Switch 1 (6 Switch Unit); Dip Switch 2 (8 Switch Unit) - Navien NHB 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
2Step MAX
Operation
1 & 2
Status
1Step MIN
1Step 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, 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
0-1,999 ft
(0-609 m)
2,000-5,399 ft
(610-1,645 m)
2 & 3 High Altitude*
5,400-7,699 ft
(1,646-2,346 m)
7,700-10,100 ft
(2,347-3,078 m)
4 Reserved -
5 & 6 Country US/Canada
Used
Space Heating
7
Thermostat
Unused
Exhaust Used
8 Temperature
Unused
Control
* For high altitude installations, the gas orifice plate must be replaced with
the proper orifice for use above 5,400 ft. Refer to "12.1 Gas & High Altitude
Conversion" for details.
When PCB DIP switch 2 #8 is set to On, ensure that
Note
CPVC, approved polypropylene, or stainless steel is
used for exhaust venting.
O
N
1 2 3 4 5 6 7 8
1-OFF
1-ON
2-OFF, 3-OFF
2-ON, 3-OFF
2-OFF, 3-ON
2-ON, 3-ON
-
5-OFF, 6-OFF
7-OFF
7-ON
8-OFF
8-ON
Setting the DIP Switches 63