Navien NCB-190/060H, Installation & Operation Manual

Page: 124 / 145

124 Appendixes
Procedure:
Note
The procedure below can be applied to
both LP conversion and High Altitude
conversion. Distinguish the kit supplied
with the boiler before installing.
1. Turn off both gas and water supply to the boiler.
2. Unfasten the 4 latches (2 at the top and 2 at the
bottom) to remove the front cover and gain
access to the internal components.
Figure 1. NCB-H Series Front Cover
3. Remove the front cover and place it in a safe
location to prevent accidental damage.
Tools Required:
●
Phillips Screwdriver
●
Flathead Screwdriver
●
5
/
32
in or 4 mm Allen Wrench
●
Combustion Analyzer or Dual Port Manometer
●
Gas Leak Detector
Included Items:
●
Gas Orifice (Table 1)
●
Gas Pressure and Conversion Kit Number Labels
NCB-190/060H, 190/080H Orifice Identification
Gas Type
NG LP
Altitude 0-5,399 ft 5,400-10,100 ft 0-10,100 ft
Orifice
GAS : NG
20049500A
4.50 / 6.30
GAS : NG
20051240A
4.65 / 6.50
GAS : LP
20050545A
3.65 / 4.95
Factory Installed
For High
altitude
For LP
Orifice
Size
Ø4.50/Ø6.30 Ø4.65/Ø6.50 Ø3.65/Ø4.95
NCB-240/110H, 240/130H, 250/150H Orifice Identification
Gas Type
NG LP
Altitude 0-5,399 ft 5,400-10,100 ft 0-10,100 ft
Orifice
GAS : NG
20049501A
4.80 / 7.50
GAS : NG
20051241A
5.05 / 7.75
GAS : LP
20050546A
3.90 / 5.65
Factory Installed
For High
altitude
For LP
Orifice
Size
Ø4.80/Ø7.50 Ø5.05/Ø7.75 Ø3.90/Ø5.65
Table 1. Orifice Size
WARNING
●
Be careful not to confuse the LP CONVERSION
KIT and HIGH ALTITUDE CONVERSION KIT. Do
NOT use the HIGH ALTITUDE CONVERSION
KIT for NG when converting to LP gas.
●
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.