Front Panel Dip Switches - Navien NHB-055 Service Manual

Set of PCB 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
Switch Function
Space Heating
1 & 2 Temperature
Control
DHW Tank
3 Temperature
Control
Space Heating
7
Thermostat
Exhaust
8 Temperature
Control
NOTE
When PCB DIP switch 2 #8 is set to On, ensure that CPVC
piping is used for exhaust venting.
20 NHB Service Manual
ON
5 6 1 2 3 4 5 6 7 8
Setting
Supply Temperature 1-OFF, 2-OFF
Return Temperature 1-ON, 2-OFF
System Supply
Temperature(with 1-OFF, 2-ON
optional sensor)
System Return
Temperature(with 1-ON, 2-ON
optional sensor)
DHW Supply
3-OFF
Temperature
DHW System Supply
Temperature(with 3-ON
optional sensor)
Used 7-OFF
Unused 7-ON
Used 8-OFF
Unused 8-ON

4.1.2 Front Panel DIP Switches

Set of Front Panel DIP Switch 1 (10 switch unit)
The DIP SW 1 on the front panel configures the temperature unit
and high altitude settings.
Before changing the settings, lift the rubber cover to access the
front panel DIP switches.
ON
1 2 3 4 5
Switch Function
°F (Fahrenheit)
Temperature
2
Unit
°C (Celsius)
0-1,999 ft. (0-609 m)
2,000-5,399 ft.
(610-1,645 m)
High
4 & 5
5,400-7,699 ft.
Altitude*
(1,646-2,346 m)
7,700-10,100 ft.
(2,347-3,078 m)
* At altitudes above 2,000 ft. (610 m) the boiler's rating will reduce by 4 %
for each 1,000ft (305 m) gain in altitude.
NOTE
This boiler may be installed at altitudes of 10,100 ft. (3,078 m)
for use with Natural Gas and 4,500 ft. (1,370 m) for use with
Propane. To use the boiler at a specific altitude, set the DIP
switches as detailed in the table above.
ON
6 7 8 9 10
1 2
Setting
2-ON
2-OFF
4-OFF, 5-OFF
4-ON, 5-OFF
4-OFF, 5-ON
4-ON, 5-ON
Version 1.0