Service Manual
57
3 Troubleshooting (continued)
Gas valve adjustment procedure
Adjusting the gas valve's regulator adjustment screw (see
FIG. 3-3) sets the manifold pressure used for the entire
modulation range. The commissioning process allows each
of the nine (9) control points to be adjusted individually.
Note: Turning the adjustment screw clockwise increases
the CO while decreasing the O2 levels.
Note: Turning the adjustment screw counterclockwise
decreases CO while increasing the O2 levels.
If combustion is still not within the specified range, repeat
the procedure above. If after four (4) adjustments and the
combustion is still not within the specified range, revisit
the possible causes in Table 3I on page 56 or gas valve
replacement may be required.
CAUTION
Under normal operating conditions the
gas valve should not need adjusting.
Any adjustment should be done in
conjunction with the commissioning
sequence as detailed in the Start-up
Section of the Crest Installation and
Operation Manual.
REGULATOR ADJUSTMENT SCREW
Figure 3-3 Gas Valve Adjustment_Regulator
Adjustment Screw
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