Navien NPE-180A2 Installation Manual page 104

CAUTION
Ensure that the High Altitude setting reflects
the actual location of the water heater. If not, it
may cause personal injury or malfunction of the
water heater.
DANGER
When conversion is required, be sure to
●
set the Panel DIP switch 1 according to the
supply gas type.
For natural gas, use the Gas Orifice for high
●
altitude when the water heater is installed at
above 5,400 ft, and be careful not to confuse
it with the Gas Orifice for propane gas.
Failure to properly set up the altitude could
●
cause carbon monoxide poisoning, resulting
in severe personal injury or death.
12. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer
(recommended)
a. Open the cover of the emissions monitoring
port as shown in Figure 7.
b. Insert the analyzer into the port.
Figure 7
Water
Altitude
Heater
0 - 5,399 ft
5,400 - 10,100 ft
NPE-
150S2
0 - 10,100 ft
High Low
Fire Fire
Fuel
%CO %CO
2 2
Natural
8.9 9.2
Gas
Propane
10.7 11.0
Gas
Water
Altitude
Heater
0 - 5,399 ft
NPE-
180A2 5,400 - 10,100 ft
NPE-
180S2
0 - 10,100 ft
0 - 5,399 ft
NPE-
210A2 5,400 - 10,100 ft
NPE-
210S2
0 - 10,100 ft
0 - 5,399 ft
NPE-
240A2 5,400 - 10,100 ft
NPE-
240S2
0 - 10,100 ft
Table 2. CO and CO value
2
(CO values must be within 0.5% of the values
2
listed.)
c. Fully open several hot water fixtures and set
the water heater to operate at 1-stage MIN
mode (refer to "Setting the Operation Mode"
on page 105). Measure the CO
low fire.
If the CO value is not within 0.5% of the
2
value listed in Table 2, the gas valve set
screw will need to be adjusted.
If adjustment is necessary, locate the set
screw as shown in Figure 8. Using a
or 4 mm Allen wrench, turn the set screw
no more than / turn clockwise to raise or
1
4
counterclockwise to lower the CO
Figure 8. Set Screw Location
The set screw is located behind
Note
the screw-on cover. This must be
removed first.
High Low
Fire Fire
Fuel
%CO %CO
2 2
Natural
8.8 8.9
Gas
Propane
10.5 10.7
Gas
Natural
8.8 8.9
Gas
Propane
10.5 10.7
Gas
Natural
8.8 8.9
Gas
Propane
10.5 10.7
Gas
value at
2
/ in
5
32
value.
2
Appendixes 103