Lochinvar 400-801 service manual Gas valve adjustment procedure, Models 601

Page 47

3 Troubleshooting (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 400

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 46 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 3-6 on page 46 or replace the gas valve.

Figure 3-2Gas Valve Adjustment: Model 400

THROTTLE ADJUSTMENT

SCREW

Model 501

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 46 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 3-6 on page 46 or replace the gas valve.

Service Manual

Figure 3-3Gas Valve Adjustment: Model 501

Models 601 - 801

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 46 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 3-6 on page 46 or replace the gas valve.

Figure 3-4Gas Valve Adjustment: Models 601 - 801

THROTTLE

ADJUSTMENT

SCREW

(REMOVE BLUE CAP)

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Contents Models 400 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleHow the control module operates Access modesGeneral Operation How the boiler operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessMenu Description See User Access Installer Access Display ModifyParameter table Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifySoftware Version Temperature units C / FViewable and changeable control parameters Time and DateFunctions Temperature SettingsData Logging DHW Settings Outdoor Reset Anti-Cycling Control modes Circulation pumps Cascade OffsetMinimum On/Off Time DHW Pump Anti-Seize Delay Boiler Pump DelayDHW Pump Delay Boiler Pump Anti-Seize DelayService Notification Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check expansion tank Check boiler relief valve Flue vent system and air pipingCheck water system Inspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsModel Kit Part Component Number Description Check flame signalCleaning boiler heat exchanger Review with ownerTest low water flow conditions Test procedureCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Wire Color R/BK and Y Wire Color G and YSystem Pump NoisyNo Pump Boiler PumpTroubleshooting Flame Fail Ign Temp SwOpen Anti-cyclingFlame Sequence Cont’dOutlet Mrhl Outlet ArhlGV/Relay Fan Low/HighFan Speed Low HighInlet Sensor FaultSensor Shorted Louver ProvingFlue Temp Diff Flue Sensor FaultFatal Error Memory ErrorOutlet Temp Flue Temp HighDelta T High Rem Ctrl Flt Service BlkWatch Dog Error No Error StoredCombustion Analysis Procedure Models 601 Gas valve adjustment procedureModel
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400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

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