Lochinvar 150 - 800 3Troubleshooting continued, Models, 4 Gas Valve Adjustment Model

Service Manual

3Troubleshooting (continued)

Model 500

Locate the throttle adjustment screw on top of the gas valve, see FIG. 3-4. 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 32 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 3F on page 32 or replace the gas valve.

Figure 3-4Gas 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 32 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 3F on page 32 or replace the gas valve.

Figure 3-5Gas Valve Adjustment: Models 600 - 800

THROTTLE

ADJUSTMENT

SCREW

(REMOVE BLUE CAP)

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