Navien NHB-055 Installation & Operation Manual page 90

Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Figure 9. Connect Digital Pressure Monometer
b. Connect a manometer to the offset pressure port. For dual
port manometers, use the positive pressure side.
Model Kit Part No.
NAC-N1
NHB-055
NAC-L1
NAC-N2
NHB-080
NAC-L2
NAC-N3
NHB-110
NAC-L3
NAC-N4
NHB-150
NAC-L4
Table 3. Offset value for low fire
90 Appendixes
Digital pressure
manometer
Gas Type Offset
NG -0.04 in ±0.01 in
LP -0.03 in ±0.01 in
NG -0.04 in ±0.01 in
LP -0.02 in ±0.01 in
NG -0.04 in ±0.01 in
LP -0.02 in ±0.01 in
NG -0.04 in ±0.01 in
LP -0.02 in ±0.01 in
c. Activate multiple zones and set the boiler to operate at
1-stage MIN mode (refer to "11.5 Setting the Operation
Mode" on page 77). 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 /
the set screw no more than
counterclockwise to lower the offset value.
Figure 10. Set Screw Location
The set screw is located behind the screw-on cover.
Note
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.
19. Once the CO or offset values have been confirmed, apply the
2
included conversion stickers to show that the appliance has
been converted to propane gas. Place these labels adjacent to
the rating plate as shown in Figure 11.
This unit has been
converted to Propane fuel
Cet appareil a ete converti au Propane
Orifice Size / Injecteur:
Min. 4.5 mm to Max. 4.8 mm
Inlet Gas Pressure / Pression d'entrée du gaz:
Min. 8.0 to Max. 13.0 inches
Manifold Gas Pressure /
Pression à la tubulure d'alimentation:
Min. -0.02 to Max. -0.66 inches WC
BTU Input / Debit calorifique:
Max. 180,000 - Min. 19,900 BTUh
Conversion Kit No.: NAC-02
Figure 11. Proper Placement of Gas Conversion Labels
in or 4mm Allen wrench, turn
32
1
/ turn clockwise to raise or
4
This boiler was converted on
______/______/______ to ____________ gas
with Kit No. ________________________
by _________________________________
_________________________________
(name and address of organization making
this conversion, who accepts responsibility
for the correctness of this conversion)