41
3 Troubleshooting
Service Manual
Gas valve adjustment procedure
1. For Models 400-500: Remove the front panel from the
unit (no tools required for removal).
For Models 650-1000: Remove the top access cover from
the unit (no tools required for removal).
2. For Models 650-1000: Remove the cover on top of the
gas valve (FIG. 3-3).
3. Use a combustion analyzer to verify CO
2
is within the range
of 9.4 – 10.4%. If not, adjust the screw counterclockwise
incrementally to raise CO
2
and clockwise to lower CO
2
(FIG. 3-2 and 3-3).
4. Replace the gas valve cover and access covers.
5. Replace the front access panel removed in Step 1 and
resume operation.
DIR #2000582949 00
ALLEN
WRENCH
ADJUSTMENT
SCREW
Figure 3-2 Gas Valve Adjustment - Models 400 - 500
COVER
ALLEN WRENCH
ADJUSTMENT SCREW
Figure 3-3 Gas Valve Adjustment - Models 650 - 1000
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