Service Manual

3Troubleshooting (continued)

Gas valve adjustment procedure

If adjustment of the gas valve is deemed necessary, use the following procedures: (Note: The procedures below are model specific.)

CAUTION Under normal operating conditions this valve should not need adjusting.

Model 399

Locate the throttle adjustment screw on the top of the gas valve, see FIG. 3-2. Using a screwdriver, turn the screw 1/8 turn counterclockwise to increase CO2 levels or 1/8 turn clockwise to decrease CO2 levels. After one adjustment on the 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 3-2Gas Valve Adjustment: Model 399

THROTTLE ADJUSTMENT

SCREW

Model 500

Locate the throttle adjustment screw on top of the gas valve, see FIG. 3-3. Using a screwdriver, turn the screw a 1/4 turn counterclockwise to increase CO2 levels or a 1/4 turn clockwise to decrease CO2 levels. After one adjustment on the 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 3-3Gas Valve Adjustment: Model 500

Models 600 - 800

Locate the throttle adjustment screw on top of the gas valve, see FIG. 3-4. Using an Allen wrench, turn the screw a 1/4 turn counterclockwise to increase CO2 levels or a 1/4 turn clockwise to decrease CO2 levels. After one adjustment on the 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 3-4Gas Valve Adjustment: Models 600 - 800

THROTTLE

ADJUSTMENT

SCREW

(REMOVE BLUE CAP)

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Lochinvar 399 - 800 service manual Gas valve adjustment procedure, Models 600

399 - 800 specifications

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