Vulcan-Hart SG4D service manual GAS Orifice, GAS Solenoid Valve

Page 12

GAS ORIFICE

Disconnect the electrical power to the machine and follow lockout / tagout procedures.

Shut off the gas before servicing the oven.

1.Remove the lower front cover as outlined under Covers and Panels.

2.Remove the bolts securing the gas manifold and place manifold aside.

3.There are two gas orifices on the manifold. Remove each orifice and replace with the correct orifice for the given altitude as needed.

4.Reverse the procedure to install manifold and check for proper operation.

GAS SOLENOID VALVE

3.Disconnect compression fittings from the valve.

4.Loosen the bolts securing the valve and bracket assembly, then remove the screws securing the valve to the bracket.

Disconnect the electrical power to the machine and follow lockout / tagout procedures.

Shut off the gas before servicing the oven.

1.Remove the control panel and the right side panel as outlined under Covers and Panels.

2.Disconnect the lead wires.

5.Reverse the procedure to install the replacement gas valve.

All gas joints disturbed during servicing must be checked for leaks. Check with soap and water solution (bubbles). Do not use an open flame.

6.Verify gas pressure as outlined under the Gas Pressure Adjustment in Service Procedures and Adjustments. Check for proper operation.

– 12 –

Image 12

Contents SG4 & SG6 Series Full Size GAS Convection Ovens VULCAN-HART Table of Contents Table of Contents General Removal and Replacement of Parts Component LocationCovers and Panels Top Front CoverBottom Front Cover Right Side PanelControl Panel Components SG4D/SG6D SG4C/SG6CComponent Panel Components Temperature Probe SG4C/SG6C Temperature Probe ShownGAS Burners GAS Orifice GAS Solenoid ValveIgnition Control Module Spark Igniter and Flame SenseBlower and Motor Oven Doors and Bearings Roller Latch Assembly Independent Doors Door Catch Roller Assembly Independent DoorsDoor Window Door Switch Lamp Assembly High Limit ThermostatInterior Lights Fan Installation Tips Cooling FANService Procedures and Adjustments Solid State Temperature Controller Test SG4D/SG6DTest Steps Solid State Temperature Control Calibration SG4D/SG6D Calibration StepsTemperature Probe Test SG4D/SG6D Temp F OhmsOperation Setup Mode Computer Controller SG4C/SG6CProbe Test Computer Control Calibration SG4C/SG6C Solid State Relay TestGAS Pressure Adjustment Door Switch Adjustment Verification of Spark AT IgnitorBlower Adjustment Flame Current MeasurementDoor Adjustment Door Strike Adjustment Independent DoorsDoor Catch Roller Adjustment Electrical Operation Component DescriptionFront View Plug, Socket and Components SG4D/SG6DControl Panel Component Panel Front ViewPlug, Socket and Components SG4C/SG6C SG4D/SG6D with Solid State Temperature Controller Sequence of OperationsCook Cycle Timer Cycle Cool Down Cycle Solid State Temperature ControllerSG4C/SG6C with Computer Controller Normal Cook CyclePage Temperature and Time Cycle Normal Cooking Roast and Hold CycleWiring Diagrams 426574 Rev. C Schematics ThermostatGAS Convection Oven SG4 with Watlow 734 Control Troubleshooting Symptoms Possible CausesComputer Control Models only Symptom Possible Causes Symptoms Possible CausesError Codes Probable Cause Solution Problem