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2
Maintenance
4. Remove the top access panel(s) to gain access to the
gas/air manifold assembly.
5. Remove the gas/air manifold burner access cover
(FIG. 2-2).
6. Remove the nuts/washers holding the burner to the
gas/air manifold assembly.
7. Remove the burner from the gas/air manifold
assembly. There is no need to remove the manifold
from the top plate for the burner removal. The
manifold is designed to gain access by removing the
manifold cover.
The burner gasket, burner, burner
NOTICE
baffle, and gas/air manifold access
cover can only be installed in one
orientation. All of these parts will
have to be re-installed correctly.
To ensure all of these parts are
re-installed correctly, align the
logo on top of the gas/air manifold
cover with the logo on the gas/air
manifold as shown in FIG. 2-2. Be
certain to pay close attention to the
bolt pattern when re-installing the
above parts.
8. When replacing the burner, ensure gaskets are in good
condition and positioned correctly (FIG. 2-2).
9. Re-install burner assembly parts in the reverse order of
disassembly.
10. When securing the burner and/or manifold, be sure to
tighten the nuts as follows:
a.
Tighten the nuts in a star pattern.
b.
Tighten all nuts to the specified torques in FIG.
2-3.
11. After firing the unit, re-tighten the nuts to the torque
specifications.
12. After final tightening of the nuts with the blower at high
rpms, check for leaks around the burner assembly.
Failure
⚠WARNING
specifications listed above could result
in severe personal injury or death.
38
to
follow
the
torqueing
Figure 2-2 Burner Assembly
NOTE: Be sure to pay close
attention to the Lochinvar logo.
Align the logo with the Lochinvar
logo on the gas/air manifold to
ensure proper assembly.
Pay close attention to the bolt
pattern, as the gas/air manifold
assembly can only be installed
one way.
LOCHINVAR LOGO
Figure 2-3 Burner Assembly Torque Values
TOP PLATE BOLT TORQUES:
15 FT - LBS for FCB1000 - FCB2000
40 FT - LBS for FCB2500 - FCB6000
BURNER MOUNTING NUTS:
• 8ft-lbs FCB1000 - FCB2000
• 12ft-lbs FCB2500 - FCB6000
Check flame signal
1. At high fire of each combustion system, the flame signal
shown on the display should be at least 10 microamps.
2. A lower flame signal may indicate a fouled or damaged
flame sense electrode. If cleaning the flame sense electrodes
does not improve, ground wiring is in good condition, and
ground continuity is satisfactory, replace the flame sense
electrode.
3. See Section 3 - Troubleshooting in this manual for other
procedures to deal with low flame signal.
Check O2 sensor
1. A self-diagnosis feature is programmed into the O2 sensor
control. If there is a problem with the O2 sensor, the
appropriate error will be displayed. The unit will continue
to operate on the last known combustion curve. Contact a
qualified service technician to inspect and replace the O2
sensor as needed.
Service Manual
GAS/AIR MANIFOLD COVER
GAS/AIR MANIFOLD GASKET
BURNER
BURNER GASKET
GAS/AIR MANIFOLD
GAS/AIR MANIFOLD GASKET
BURNER TOP PLATE ASSEMBLY
FIBERBOARD
GASKET
IMG01141
MANIFOLD COVER NUTS - 8ft-lbs
ALL UNITS
MANIFOLD FLANGE NUTS - 25ft-lbs
ALL UNITS
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