Vulcan-Hart SG4D service manual SG4C/SG6C with Computer Controller, Normal Cook Cycle

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2.Power switch (S1) turned to COOL DOWN.

A.Power to fan speed switch (S3). Set fan speed switch to either HI or LO.

3.If door is closed, power is supplied to one side of the following components:

A.Power ON light (Amber) comes ON.

B.Transformer (T1) energized.

1)Power (24 VAC) to one side of the following components: heat relay (R3) normally open (N.O.) contacts, high limit connected through the normally closed (N.C.) contacts to the first valve (safety) on the dual solenoid gas valve.

a.First valve (safety) on the gas valve energized. Gas does not flow to the burner until the second valve (main) is energized.

C.Component cooling fan.

D.Power to timer and oven cavity lights.

4.The oven will remain in this condition until the master switch (S1) is turned to the OFF or ON position.

SG4C/SG6C with Computer Controller

Schematic 426575-1 will be used to explain the electrical sequence of operation.

Normal Cook Cycle

1.Conditions

A.Oven connected to correct voltage.

1)L1 (hot) to power switch (S1).

2)L2 (neutral or second line) to one side of the following components: oven cavity lights, convection fan motor common (C), transformer primary (T2), component cooling fan and the heat relay coil (R1).

B.Oven properly grounded.

1)Ground (GND) to one side of the following components: computer control case, no ignition light, transformer secondary (T2), ignition control module, the first valve (safety) and second valve (main) on the dual solenoid gas valve and computer control pin 9 (C3-9).

C.Gas supply valve ON.

D.Gas combination control valve ON.

E.Power switch (S1) OFF.

F.Computer control is set up properly and ready to use.

G.Oven lights switch (S2) ON or OFF (position has no affect on the function of the normal cook cycle).

H.High limit thermostat closed.

I.Oven doors closed.

J.Oven cavity temperature below 140°F.

2.Power switch (S1) turned ON.

A.Power (120 VAC) to computer control pin 3 (C3-3). Power at pin 3 is not transferred to other components until computer control is energized and operation conditions are met.

B.Power is available to the oven light switch (S2).

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Contents SG4 & SG6 Series Full Size GAS Convection Ovens VULCAN-HART Table of Contents Table of Contents General Component Location Removal and Replacement of PartsRight Side Panel Covers and PanelsTop Front Cover Bottom Front CoverSG4D/SG6D SG4C/SG6C Control Panel ComponentsComponent Panel Components SG4C/SG6C Temperature Probe Shown Temperature ProbeGAS Burners GAS Solenoid Valve GAS OrificeSpark Igniter and Flame Sense Ignition Control ModuleBlower and Motor Oven Doors and Bearings Door Window Roller Latch Assembly Independent DoorsDoor Catch Roller Assembly Independent Doors Door Switch Interior Lights Lamp AssemblyHigh Limit Thermostat Cooling FAN Fan Installation TipsTest Steps Service Procedures and AdjustmentsSolid State Temperature Controller Test SG4D/SG6D Calibration Steps Solid State Temperature Control Calibration SG4D/SG6DTemp F Ohms Temperature Probe Test SG4D/SG6DProbe Test Operation Setup ModeComputer Controller SG4C/SG6C Solid State Relay Test Computer Control Calibration SG4C/SG6CGAS Pressure Adjustment Verification of Spark AT Ignitor Door Switch AdjustmentFlame Current Measurement Blower AdjustmentDoor Strike Adjustment Independent Doors Door AdjustmentDoor Catch Roller Adjustment Component Description Electrical OperationPlug, Socket and Components SG4D/SG6D Front ViewPlug, Socket and Components SG4C/SG6C Control Panel Component PanelFront View Cook Cycle SG4D/SG6D with Solid State Temperature ControllerSequence of Operations Cool Down Cycle Solid State Temperature Controller Timer CycleNormal Cook Cycle SG4C/SG6C with Computer ControllerPage Roast and Hold Cycle Temperature and Time Cycle Normal CookingWiring Diagrams 426574 Rev. C Thermostat SchematicsGAS Convection Oven SG4 with Watlow 734 Control Symptoms Possible Causes TroubleshootingSymptoms Possible Causes Computer Control Models only Symptom Possible CausesError Codes Probable Cause Solution Problem
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