Navien NPE-32AWE, Installation Manual

Page: 51 / 68

5 1 Appendixes
c. Fully open several hot water fixtures and set the
water heater to operate at 1-stage MIN mode (refer
to
7 .1.1 S etting the Operation Mode). Measure the CO
2
value at low fire.
If the CO
2
value is not within 0.5 % of the 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 5/32” or 4 mm Allen wrench, turn the
set screw no more than 1/4 turn clockwise to raise or
counterclockwise to lower the CO
2
value.
Figure 8. S et S crew Location
Note
The set screw is located behind the screw-on
cover. This must be removed first.
d. Fully open several hot water fixtures and set the
water heater to operate at 2-stage MA X mode (refer
to 7 .1.1 S etting the Operation Mode). Measure the CO
2
value at high fire.
If the CO
2
values do not match Table 2 at high fire, do
not adjust the gas valve. Check for the proper Gas
Orifice.
DANGER
Improper gas valve settings can cause severe personal
injury or substantial property damage.
7.1.1 S etting the Op eration Mode
1. Using the Front Panel, press and hold the Diagnostics Button
for over 5 seconds until “1.T S T” is displayed.
2. Press the + (Up) button once to change the display to
“2.OP R ”.
3. Press the Information Button once to access the Operation
Mode menu.
4. Press the + (Up) button once to set the water heater to
operate at 1-stage MIN (“MIN.1”).
5. To set the water heater to operate at 2-stage MA X , press the
+ (Up) button 3 times or until “MA X .2” is displayed.
6. To exit the Operation Mode and return the water heater to
normal operation, press the R eset button twice.
Diagnostics
Information
R eset