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8. Replace the gas inlet pipe to its original position and use all
screws to secure all connections.
Do not overtighten as this may damage or
Note
crack the components.
9. Set the Front Panel Dip switch according to the following
figure and table.
WARNING
Be sure to turn off the power before changing the DIP
switch setting.
Figure 6. Front Panel Dip Switch Settings
Dip Switch 1 (set of 10)
Switch
Function
Gas
9 - 10
Category
Dip Switch 2 (set of 2)
Switch
Function
2
Gas Type
Table 2. Front panel dip switch settings
DANGER
When conversion is required, be sure to set the Front
Panel DIP switches according to the supply gas type.
Failure to properly set the DIP switches could cause
carbon monoxide poisoning, resulting in severe personal
injury.
10. Turn on the gas and water supply to the water heater.
50 Appendixes
ON
ON
1
2
3
4
5
6
7
8
9
10
Setting
G20(LNG) / G30(LPG)
9-OFF 10-OFF
G25(LNG) / G31(LPG)
9-ON 10-OFF
G27(LNG)
9-OFF 10-ON
Setting
LNG
LPG
11. Measure and adjust the gas/air ratio using a combustion
analyser (recommended). Perform the following tasks:
a. Rotate and remove the cap to access the emissions
monitoring port as shown in Figure 7.
b. Insert the analyser into the port (Figure 7).
ON
1
2
Figure 7. Measuring and Adjusting the Gas/Air Ratio
Model
NPE-24
AWE/SWE
NPE-32
AWE/SWE
OFF
ON
(CO
Value must be within 0.5% of the values listed.)
2
Max
Gas
%CO
2
G20
9.18
G25
9.18
G25.1
10.63
G27
9.13
G30
11.56
G31
10.65
G20
9.31
G25
9.40
G25.1
10.45
G27
9.00
G30
11.30
G31
10.48
Table 3. CO
value
2
Min
%CO
2
9.18
9.49
10.53
9.14
10.95
10.18
9.27
9.30
10.35
8.75
11.10
10.18
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