Navien NFC-175 Installation & Operation Manual page 109

c. Activate multiple zones and set the boiler to operate at
1-stage MIN mode (refer to "11.4.7 Setting the Special
Operation Modes" on page 100). 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 9. Using a / in or 4mm Allen wrench, turn
5
32
the set screw no more than
counterclockwise to lower the offset value.
Figure 9. 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.
/ turn clockwise to raise or
1
4
13. 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 or High Altitude. Place these
labels adjacent to the rating plate as shown in Figure 10.
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. 4.9 mm
Inlet Gas Pressure / Pression d'entrée du gaz:
Min. 8.0 to Max. 13.0 in WC
Manifold Gas Pressure /
Pression à la tubulure d'alimentation:
-0.45 in WC
BTU Input / Debit calori que:
Max. 199,900 - Min. 18,000 BTUh
Conversion Kit No.: NAC-LC200
Figure 10. Proper Placement of Gas Conversion Labels
The gas conversion rating plate varies depending
Note
on the model. Check the conversion kit number
before attaching the labels.
This unit has been
converted to High Altitude /
Cet appareil a ete converti au Haute altitude
Ori ce Size / Injecteur:
Min. 6.3 mm to Max. 6.8 mm
Inlet Gas Pressure / Pression d'entrée du gaz:
Min. 8.0 to Max. 13.0 in WC
Manifold Gas Pressure /
Pression à la tubulure d'alimentation:
-0.20 in WC
BTU Input / Debit calori que:
Max. 199,900 - Min. 18,000 BTUh
Conversion Kit No.: NAC-NCH200
Appendixes 109