Gas Valve Adjustment Procedure - Lochinvar 50 Service Manual

Service Manual
3
Troubleshooting
(continued)

Gas valve adjustment procedure

If adjustment of the gas valve is deemed necessary, use the
following procedures:
Locate the throttle adjustment screw on the side of the venturi
valve (FIG. 3-2). Using a screwdriver, turn the screw a 1/4 turn
clockwise to increase CO levels or a 1/4 turn counterclockwise
2
to decrease CO levels. After performing one adjustment on the
2
valve, follow the Combustion Analysis Procedure on page 40 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 3G on page 40 or replace the gas valve.
Figure 3-2 Gas Valve Adjustment
41