Navien NHB-055 Service Manual page 30

c. Activate multiple zones and set the boiler to operate at
1-stage MIN mode (refer to "(3) Operation Conditions
Settings" on page 59). 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 12. Using a 5/32 in or 4mm Allen wrench, turn
the set screw no more than 1/4 turn clockwise to raise or
counter clockwise to lower the offset value.
Figure 12 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.
30 NHB Service Manual
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 this labels adjacent to
the rating plate as shown in Figure 13.
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 13. Proper Placement of Gas Conversion Labels
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)
Version 1.0