Navien NCB-180 Installation & Operation Manual page 64

Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Digital pressure
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-400
NCB-180
NAC-04
NAC-500
NCB-210
NAC-05
NAC-600
NCB-240
NAC-06
Table 3. Offset value for low fire
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
c. Fully open a hot water fixture and set the boiler to operate
at 1-stage MIN mode (refer to table 2). 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
Note
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.
17. 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
Ori ce 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 calori que:
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
/ turn clockwise to raise or
1
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)
Appendixes 63