Navien NFC-250/175H Installation Manual page 133

WARNING
Ensure that you have turned off the power to
the boiler before accessing the DIP switches.
O O
N N
1 2 3 4 5 6 1
Switch Function Setting
Natural Gas
1 Gas Type
Propane Gas
0-1,999 ft
(0-609m)
2,000-5,399 ft
(610-1,645m)
High
2&3
Altitude
5,400-7,699 ft
(1,646-2,346m)
7,700-10,100 ft
(2,347-3,078m)
When applying the Gas Orifice for high altitude,
set the PCB DIP switches by altitude according
to the table above.
This unit may be installed at elevations
Note
●
up to 10,100 ft (3,078 m) for use with
natural gas and propane.
To use the unit at a specific altitude,
the DIP Switches should be set as
described above.
High Altitude: Above 2,000 ft (610 m),
●
the unit will de-rate by 3% for each
1,000 ft (305 m) of altitude gain.
For Natural Gas, if you install the unit at
●
above 5,400 ft (1,646 m), it is required
to change the Gas Orifice for high
altitude. Be careful not to confuse it
with the Gas Orifice for Propane.
Note that the Gas Orifice from the
●
PROPANE CONVERSION KIT covers the
boiler's installation at an altitude of 0 to
10,100 ft.
2 3 4 5 6 7 8
Comment
1-OFF
1-ON
2-OFF,
3-OFF
Refer to
Table 1
2-ON,
on page
3-OFF
130.
2-OFF,
3-ON
2-ON,
3-ON
CAUTION
Ensure that the High Altitude setting reflects the
actual location of the boiler. If not, it may cause
personal injury or malfunction of the boiler.
DANGER
When conversion is required, be sure to
●
set the PCB DIP SW2 (Set of 8 Switches) #1
according to the supply gas type.
For NG, use the Gas Orifice for high altitude
●
when the boiler is installed at above 5,400 ft,
and be careful not to confuse it with the Gas
Orifice for LP.
For High Altitude conversion, check the DIP
●
switches setting value by altitude before
setting.
Failure to properly set the DIP switches could
●
cause carbon monoxide poisoning, resulting
in severe personal injury or death.
11. Turn on the gas and water supply to the boiler.
12. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer
(recommended)
a. Remove the analyzer port's cap.
b. Insert the analyzer into the port (Figure 7).
Figure 7. Insert the Analyzer
Appendixes 133