Setting The Dip Switches; Dip Switch 1 (6 Switch Unit); Dip Switch 2 (8 Switch Unit) - Navien NFC-175 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
Switch Function
Operation
1 & 2
Status
3 & 4 Reserved
5 & 6 Model
60 Setting the DIP Switches
O
N
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
- -
NFC-200 5-OFF, 6-OFF
NFC-175 5-ON, 6-OFF

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
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)
Used
4 Well Pump
Unused
5 & 6 Country US/Canada
Space Used
7 Heating
Unused
Thermostat
Exhaust Used
8 Temperature
Unused
Control
O
N
1 2 3 4 5 6 7 8
Comment
1-OFF
1-ON
Refer to
2-OFF,
Table 1 in
3-OFF
"12.1 Gas
& High
2-ON,
Altitude
3-OFF
Conversion"
2-OFF, on page
3-ON
103
2-ON,
3-ON
4-ON -
4-OFF -
5-OFF,
-
6-OFF
7-OFF -
7-ON -
8-OFF -
8-ON -