Crest Audio FBN0751 - Gas Valve Adjustment Procedure

3 Troubleshooting (continued)
Service Manual
53
Gas valve adjustment procedure
IMG01142
GAS VALVE 2
GAS VALVE 1
Figure 3-2 Gas Valve Adjustment
Locate the throttle adjustment screw on the gas valve (see
FIG. 3-2). Using a screwdriver, turn the screw a 1/4 turn
counterclockwise to increase CO
2
levels or a 1/4 turn
clockwise to decrease CO
2
levels. After one adjustment on
the valve, follow the Combustion Analysis Procedure on
page 52 of this manual to measure the combustion.
If combustion is still not within the specified range,
repeat the procedure. This procedure SHOULD NOT
be performed more than four (4) times. If after four (4)
adjustments and the combustion is still not within the
specified range, revisit the possible causes in Table 3H on
page 52 or replace the gas valve.
CAUTION
Under normal operating conditions this
valve should not need adjusting.