Navien NBH Series User Manual

90 Appendixes
Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Digital pressure
manometer
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. Gas Type Offset
NHB-055
NAC-N1 NG -0.04 in ±0.01 in
NAC-L1 LP -0.03 in ±0.01 in
NHB-080
NAC-N2 NG -0.04 in ±0.01 in
NAC-L2 LP -0.02 in ±0.01 in
NHB-110
NAC-N3 NG -0.04 in ±0.01 in
NAC-L3 LP -0.02 in ±0.01 in
NHB-150
NAC-N4 NG -0.04 in ±0.01 in
NAC-L4 LP -0.02 in ±0.01 in
Table 3. Offset value for low fire
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
/
32
in or 4mm Allen wrench, turn
the set screw no more than
1
/
4
turn clockwise to raise or
counterclockwise to lower the offset value.
Figure 10. Set Screw Location
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.
19. 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 these labels adjacent to
the rating plate as shown in Figure 11.
Orice 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 calorique:
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 boiler 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

Navien NBH Series Specifications

General

Brand	Navien
Model	NBH Series
Category	Boiler
Language	English