Navien NFB-175H, Installation Manual, Page: 123 / 135

123 Appendixes
13. 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 or High Altitude.
Place these labels adjacent to the rating plate as
shown in Figure 11.
Figure 11. Proper Placement of
Gas Conversion Labels
Note
The gas conversion rating plate
varies depending on the model.
Check the conversion kit number
before attaching the labels.
c. Activate multiple zones and set the boiler
to operate at 1-stage MIN mode (refer
to “11.6.7 Setting the Special Operation
Modes” on page 114). 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.