44 Appendixes
d. Fully open several hot water fixtures and set the water
heater to operate at 2-stage MAX mode (refer to
page 45). 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,
death or substantial property damage.
Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Figure 9
b. Connect a manometer to the offset pressure port. For dual
port manometers, use the positive pressure side.
Model Kit Part No. Gas Type Offset
NPE-150S
NAC-N6 LP -0.03 in ± 0.01 in
NAC-L6 NG -0.04 in ± 0.01 in
NPE-180A
NPE-180S
NAC-01 LP -0.03 in ± 0.01 in
NAC-100 NG -0.04 in ± 0.01 in
NPE-210A
NPE-210S
NAC-02 LP -0.02 in ± 0.01 in
NAC-200 NG -0.04 in ± 0.01 in
NPE-240A
NPE-240S
NAC-03 LP -0.02 in ± 0.01 in
NAC-300 NG -0.04 in ± 0.01 in
Table 3. Offset value for low fire
c. Fully open a hot water fixture and set the water heater to
operate at 1-stage MIN mode (refer to page 45). Measure
the offset value at low fire and compare it to the values in
Table 3. If the offset value is out of range, the gas valve set
screw will need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 10. Using a
5
/
32
in or 4 mm Allen wrench, turn
the set screw no more than
1
/
4
turn clockwise to raise or
counterclockwise to lower the offset value.
Figure 10
Note
The set screw is located behind the screw-on
cover. This must be removed first.
d. At high fire, do not check the offset value and never adjust
the gas valve.
DANGER
Improper gas valve settings can cause severe personal injury,
death or substantial property damage.
12. Once the CO
2
or offset values have been confirmed, apply the
included conversion stickers to show that the appliance has
been converted to propane gas. Place this labels adjacent to
the rating plate as shown in Figure 11.
Orice Size / Injecteur:
Min. 4.5 mm to Max. 4.8 mm
This unit has been
converted to Propane fuel
Cet appareil a ete converti au Propane
Manifold Gas Pressure /
Pression à la tubulure d’alimentation:
Min. -0.02 to Max. -0.66 inches WC
BTU Input / Debit calorique:
Max. 180,000 - Min. 19,900 BTUh
Conversion Kit No.: NAC-02
Inlet Gas Pressure / Pression d'entrée du gaz:
Min. 8.0 to Max. 13.0 inches
with Kit No. ________________________
This water heater was converted on
(name and address of organization making
this conversion, who accepts responsibility
for the correctness of this conversion)
______/______/______ to ____________ gas
by _________________________________
_________________________________
Figure 11. Proper Placement of Gas Conversion Labels
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