Navien NFC-250/175H, Руководство по установке, Страница: 80 / 151

80 Setting the DIP Switches
6.2 Dip Switch 2 (Set of 8 Switches)
The DIP SW2 (Set of 8 Switches) on the circuit board configures the gas type, altitude, temperature control
modes, country, and enables or disables the space heating thermostat.
1 2 3 4 5 6
O
N
O
N
1 2 3 4 5 6 7 8
Switch Function Setting Comment
1 Gas Type
Natural Gas 1-OFF
Refer to Table 1 in
“12.1 Gas & High
Altitude Conversion”
on page 129.
Propane Gas 1-ON
2 & 3 High Altitude
0-1,999 ft (0-609 m) 2-OFF, 3-OFF
2,000-5,399 ft (610-1,645 m) 2-ON, 3-OFF
5,400-7,699 ft (1,646-2,346 m) 2-OFF, 3-ON
7,700-10,100 ft (2,347-3,078 m) 2-ON, 3-ON
4 Well Pump
Used 4-ON -
Unused 4-OFF -
5 & 6 Country US/Canada 5-OFF, 6-OFF -
7
Space Heating
Thermostat
Used 7-OFF -
Unused 7-ON -
8
Exhaust Temperature
Control
Used 8-OFF -
Unused 8-ON -
Note
●
When PCB DIP switch 2 #8 is set to On, ensure that CPVC, polypropylene, or stainless steel is used for
exhaust venting.
●
This unit may be installed at elevations 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 NG, 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 LP Gas Orifice. Refer to “12.1 Gas & High Altitude Conversion”
on page 129 for details.
●
Common vent installations for use with natural gas and propane are only approved for up to 4,500 ft.
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.