120 Appendixes
10. Set the PCB DIP switch to change the gas type.
For LP, set DIP SW2 (Set of 8 Switches) #1 to ON.
For NG, set DIP SW2 (Set of 8 Switches) #1 to
OFF.
WARNING
Ensure that you have turned off the power to
the boiler before accessing the DIP switches.
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
on page
118.
Propane Gas
1-ON
2&3
High
Altitude
0-1,999 ft
(0-609m)
2-OFF,
3-OFF
2,000-5,399 ft
(610-1,645m)
2-ON,
3-OFF
5,400-7,699 ft
(1,646-2,346m)
2-OFF,
3-ON
7,700-10,100 ft
(2,347-3,078m)
2-ON,
3-ON
When applying the Gas Orifice for high altitude,
set the PCB DIP switches by altitude according
to the table above.
DANGER
See Figure 5. Inspect the O-ring between the
gas valve and gas valve inlet adapter whenever
they are disassembled. The O-ring must be in
good condition and must be installed. Failure to
comply will cause a gas leak, resulting in severe
personal injury or death.
GAS : NG
20052127A
4.8 / 7.90
GAS : NG(H)
20052133A
5.05 / 8.4
GAS : LP
20052143A
3.90 / 6.00
<NFB-175H, NFB-200H Orifice Identification>
Figure 6. Orifice Identification
8. Remove the Gas Orifice, ensure that the packing
is properly seated inside the port, and then
install the new Gas Orifice for use with Propane
gas. Ensure that the Orifice is properly seated on
the packing inside the port before proceeding
to the next step.
Packing
9. Replace the gas valve outlet adapter to its
original position and use all screws to secure all
connections.
Note
Do not overtighten as this may
damage or crack the components.
Summary of Contents for NFB-175H
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