Vulcan-Hart SG4D service manual Temperature and Time Cycle Normal Cooking, Roast and Hold Cycle

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2)Oven heat LED on the control goes out.

3)Oven ready LED on the control comes ON.

4)Electronic beeper sounds momentarily.

C.The oven will continue to cycle on the computer control until the doors are opened or power switch (S1) is turned to the OFF or COOL DOWN position.

Temperature and Time Cycle (Normal Cooking)

The computer's internal cook timer operates independently of the heating cycle. Additional time can be set or the timer can be stopped and restarted throughout the cooking cycle.

Refer to the Installation & Operation Manual for specific operation instructions of the oven computer control.

Function Switch SG4C/SG6C - Selects the cooking mode of the oven between Cook or Roast and Hold. Is used in conjunction with the Roast and Hold timer during Roast and Hold cooking. The selected mode also determines the fixed blower speed: HI for Cook and LO for Roast and Hold.

If Roast and Hold is selected, when the Roast (then hold) time expires, the oven heating stops and the oven enters the hold mode. Once the even cavity temperature drops to 150°F, the heat comes back on and the oven cycles at this temperature to hold the cooked product.

Roast and Hold Cycle

For a detailed explanation of the Roast and Hold mode, refer to the instructions manual.

In the Roast and Hold mode, the operation of the computer control is identical to the normal cook cycle, with these exceptions:

1.Oven Roast and Hold light on the control comes ON.

2.Convection fan speed changes from HI to LO.

A. The computer control 5 VDC output from pins C2-2 (-) and C2-8 (=) is deactivated and SSR1 relay is de-energized.

1)Power (120 VAC) is removed from convection fan motor high speed terminal.

B.The computer control 5 VDC output from pins C2-1 (-) and C2-8 (+) is activated and SSR2 relay is energized.

1)Power (120 VAC) is applied to the convection fan motor low speed terminal.

3.At the end of the cook time, the electronic beeper sounds momentarily to indicate the end of the first stage cooking (oven operates normally at the temperature and time selected until time expires).

4.The display flashes HOLD as the oven enters the hold mode. This is also considered second stage cooking (oven heating stops but product continues to cook on residual heat).

A.Convection fan motor is de-energized.

B.Oven fan cycles with the output of the heating system. Anytime the system calls for heat, the fan must be running. After the oven has reached the 150°F set temperature, the heat and fan are de- energized.

5.After the oven temperature drops below 150°F, the heat comes back on and cycles as needed to maintain the hold temperature of 150°F.

A.Convection fan motor energized.

6.The oven continues to cycle in this manner until one of he following occurs:

A.The cook and hold mode is turned OFF.

B.Power switch (S1) is turned to the OFF or COOL DOWN position.

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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 PartsTop Front Cover Covers and PanelsBottom Front Cover Right Side PanelSG4D/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 Catch Roller Assembly Independent Doors Roller Latch Assembly Independent DoorsDoor Window Door Switch High Limit Thermostat Lamp AssemblyInterior Lights Cooling FAN Fan Installation TipsSolid State Temperature Controller Test SG4D/SG6D Service Procedures and AdjustmentsTest Steps Calibration Steps Solid State Temperature Control Calibration SG4D/SG6DTemp F Ohms Temperature Probe Test SG4D/SG6DComputer Controller SG4C/SG6C Operation Setup ModeProbe Test 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 ViewFront View Control Panel Component PanelPlug, Socket and Components SG4C/SG6C Sequence of Operations SG4D/SG6D with Solid State Temperature ControllerCook Cycle 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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