Gas Valve Adjustment Procedure - Lochinvar 151 - 801 Service Manual

3
Troubleshooting

Gas valve adjustment procedure

If adjustment of the gas valve is deemed necessary, use the
following procedures: (Note: The procedures in this section
are model specific.)
Models 151 - 286
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 decrease CO
counterclockwise to increase CO
one adjustment on the valve, follow the Combustion
Analysis Procedure on page 36 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 36 or replace the gas
valve.
Figure 3-2 Gas Valve Adjustment: Models 151 - 286
(continued)
levels or a 1/4 turn
2
levels. After performing
2
Outdoor Armor Water Heater Service Manual
Model 400
Locate the throttle adjustment screw on the top of the gas
valve, see FIG. 3-3. Using a screwdriver, turn the screw 1/8
turn counterclockwise to increase CO
clockwise to decrease CO
2
the valve, follow the Combustion Analysis Procedure on page
36 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 36 or replace the gas
valve.
Figure 3-3 Gas Valve Adjustment: Model 400
THROTTLE ADJUSTMENT
SCREW
levels or 1/8 turn
2
levels. After one adjustment on
37