110 Appendixes
12.1 Gas & High Altitude Conversion
This boiler is configured for Natural Gas at the factory.
Ɣ
If conversion to Propane Gas is required by the boiler, use the LP
CONVERSION KIT supplied with the boiler.
Ɣ
If the boiler is installed at a high altitude above 5,400ft, use the
HIGH ALTITUDE CONVERSION KIT supplied with the boiler.
WARNING
This conversion kit must be installed by a qualified service
agency* in accordance with Navien’s instructions and all
applicable codes and requirements of the authority having
jurisdiction. The information in these instructions must be
followed to minimize the risk of fire or explosion or to prevent
property damage, personal injury or death. The qualified
service agency is responsible for the proper installation of
this kit. The installation is not proper and complete until the
operation of the converted appliance is checked as specified in
the manufacturer’s instructions supplied with the kit.
* A qualified service agency is any individual, firm, corporation or company
which either in person or through a representative is engaged in and
is responsible for the connection, utilization, repair or servicing of gas
utilization equipment or accessories; who is experienced in such work,
familiar with all precautions required, and has complied with all of the
requirements of the authority having jurisdiction.
In Canada
: The conversion shall be carried out in accordance with
the requirements of the provincial authorities having jurisdiction
and in accordance with the requirements of the CAN‐B149.1 and
CAN1‐B149.2 Installation Code.
Tools Required:
Ɣ
Phillips Screwdriver
Ɣ
Flathead Screwdriver
Ɣ
5
/
32
in or 4 mm Allen Wrench
Ɣ
T40 or 6.65 mm Star Wrench
Ɣ
Combustion Analyzer or Dual Port Manometer
Ɣ
Gas Leak Detector
Included Items:
Ɣ
Gas Orifice (Table 1)
Ɣ
Gas Pressure and Conversion Kit Number Labels
NFB-301C Orifice Identification
Gas Type
NG
LP
Altitude
0-5,399 ft
5,400-
10,100 ft
0-5,399 ft
5,400-
10,100 ft
Orifice
NFB-301C
1STEP-ORIFICE
NG : 6.75
NFB-301C
1STEP-ORIFICE
NG,H : 7.40
20046179A
NFB-301C
1STEP-ORIFICE
LP : 5.4
NFB-301C
1STEP-ORIFICE
LP : 5.4
NFB-301C
1STEP-ORIFICE
NG : 9.25
NFB-399C
2STEP-ORIFICE
NG,H : 9.60
20046180A
NFB-301C
2STEP-ORIFICE
LP : 6.75
NFB-301C
2STEP-ORIFICE
LP.H : 6.65
20046181A
Factory
Installed
For High
Altitude
For Sea
Level
For High
Altitude
Orifice
Size
Ø6.75 /
Ø9.25
Ø7.40 /
Ø9.60
Ø5.40 /
Ø6.75
Ø5.40 /
Ø6.65
NFB-399C Orifice Identification
Gas Type
NG
LP
Altitude
0-5,399 ft
5,400-
10,100 ft
0-5,399 ft
5,400-
10,100 ft
Orifice
NFB-399C
1STEP-ORIFICE
NG : 8.35
NFB-399C
1STEP-ORIFICE
NG,H : 8.65
20046182A
NFB-399C
1STEP-ORIFICE
LP : 6.55
NFB-399C
1STEP-ORIFICE
LP : 6.55
NFB-399C
2STEP-ORIFICE
NG : 15.1
NFB-399C
2STEP-ORIFICE
NG,H : 17.0
20046183A
NFB-399C
2STEP-ORIFICE
LP : 9.5
NFB-399C
2STEP-ORIFICE
LP,H : 9.30
2046184A
Factory
Installed
For High
Altitude
For Sea
Level
For High
Altitude
Orifice
Size
Ø8.35 /
Ø15.1
Ø8.65 /
Ø17.0
Ø6.55 /
Ø9.50
Ø6.55 /
Ø9.30
Table 1. Orifice Size
WARNING
Ɣ
NG and LP high altitude conversion kits and a LP conversion
kit are provided with the boiler. Be careful not to confuse
the LP conversion kit and LP high altitude conversion kit.
Ɣ
Make sure that the conversion is completed with the proper
orifice. If the installed orifice does not conform to the
specifications in Table 1, incomplete combustion may occur,
resulting in personal injury or property damage.
12. Appendixes
Summary of Contents for NHB Series
Page 120: ...120 Appendixes 12 6 Component Assembly Diagrams and Part Lists 12 6 1 Case Assembly NFB 301C...
Page 122: ...122 Appendixes 12 6 2 Case Assembly NFB 399C...
Page 124: ...124 Appendixes 12 6 3 Heat Exchanger and Waterway Assembly NFB 301C...
Page 126: ...126 Appendixes 12 6 4 Heat Exchanger and Waterway Assembly NFB 399C...
Page 128: ...128 Appendixes 12 6 5 Combustion Parts Assembly NFB 301C...
Page 131: ...131 Appendixes 12 6 6 Combustion Parts Assembly NFB 399C...
Page 134: ...Memo...
