Vulcan-Hart SG4D User Manual

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Model SG4D

SERVICE MANUAL

SG4 & SG6 SERIES FULL SIZE GAS

CONVECTION OVENS

MODELS

SG4D ML-114875 SG4C ML-114876 SG6D ML-114877 SG6C ML-114878

- NOTICE -

This manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. If you have attended a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this manual.

This manual is not intended to be all encompassing. If you have not attended a Vulcan Service School for this product, you should read, in it's entirety, the repair procedure you wish to perform to determine if you have the necessary tools, instruments and skills required to perform the procedure. Procedures for which you do not have the necessary tools, instruments and skills should be performed by a trained Vulcan Service Technician.

Reproduction or other use of this Manual, without the express written consent of Vulcan-Hart, is prohibited.

For additional information on Vulcan-Hart or to locate an authorized parts

and service provider in your area, visit our website at www.vulcanhart.com

VULCAN-HART DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC

WWW.VULCANHART.COM

– 1 –

P.O. BOX 696, LOUISVILLE, KY 40201-0696

TEL. (502) 778-2791

FORM 35626 Rev. A (02-08)

– 2 –

TABLE OF CONTENTS

GENERAL .............................................................................................................................................................. 5

Introduction ............................................................................................................................................... 5

Installation ................................................................................................................................................ 5

Operation ................................................................................................................................................... 5

Cleaning .................................................................................................................................................... 5

Lubrication................................................................................................................................................. 5

Specifications ........................................................................................................................................... 5

Electrical Data .................................................................................................................................... 5

Gas Data............................................................................................................................................. 5

Tools ......................................................................................................................................................... 5

Standard ............................................................................................................................................. 5

Special ................................................................................................................................................ 5

REMOVAL AND REPLACEMENT OF PARTS ..................................................................................................... 6

Component Location ................................................................................................................................. 6

Covers and Panels ................................................................................................................................... 7

Top Front Cover.................................................................................................................................. 7

Bottom Front Cover ............................................................................................................................ 7

Control Panel ...................................................................................................................................... 7

Right Side Panel ................................................................................................................................. 7

Control Panel Components ....................................................................................................................... 8

Procedure ........................................................................................................................................... 8

Component Panel Components ................................................................................................................ 9

Procedure ........................................................................................................................................... 9

Temperature Probe .................................................................................................................................. 10

Gas Burners .............................................................................................................................................11

Gas Orifice ...............................................................................................................................................12

Gas Solenoid Valve .................................................................................................................................12

Ignition Control Module ............................................................................................................................ 13

Spark Igniter and Flame Sense ...............................................................................................................13

Blower and Motor ..................................................................................................................................... 14

Oven Doors and Bearings .......................................................................................................................15

Roller Latch Assembly.............................................................................................................................16

Door Catch Assembly ..............................................................................................................................16

Door Window ............................................................................................................................................ 16

Door Switch ..............................................................................................................................................17

High Limit Thermostat .............................................................................................................................18

Interior Lights ...........................................................................................................................................18

Lamp Assembly.................................................................................................................................18

Cooling Fan ..............................................................................................................................................19

Fan Installation Tips ..........................................................................................................................19

SERVICE PROCEDURES AND ADJUSTMENTS ............................................................................................... 20

Solid State Temperature Controller Test (SG4D/SG6D) ........................................................................20

Test Steps .........................................................................................................................................20

Solid State Temperature Controller Calibration (SG4D/SG6D)..............................................................21

Calibration Steps ...............................................................................................................................21

Calibration Tips ................................................................................................................................. 21

Temperature Probe Test (SG4D/SG6D) .................................................................................................22

Test Steps .........................................................................................................................................22

– 3 –

TABLE OF CONTENTS (Cont.)

Computer Controller (SG4C/SG6C) ......................................................................................................... 23

Operation ...........................................................................................................................................23

Setup Mode ....................................................................................................................................... 23

Probe Test .........................................................................................................................................23

Solid State Relay Test ......................................................................................................................24

Computer Controller Calibration (SG4C/SG6C) .......................................................................................24

Calibration Steps ............................................................................................................................... 24

Gas Pressure Adjustment ....................................................................................................................... 25

Verification of Spark at Igniter ................................................................................................................ 26

Door Switch Adjustment .......................................................................................................................... 26

Flame Current Measurements .................................................................................................................27

Blower Adjustment ...................................................................................................................................27

Door Adjustment ...................................................................................................................................... 28

Door Strike Adjustment............................................................................................................................ 28

Door Catch Roller Adjustment ................................................................................................................. 29

ELECTRICAL OPERATION .................................................................................................................................30

Component Description ...........................................................................................................................30

Plug, Socket and Components (SG4D/SG6D) ........................................................................................31

Plug, Socket and Components (SG4C/SG6C) ........................................................................................32

Sequence of Operations ..........................................................................................................................33

SG4D/SG6D with Solid State Temperature Controller ..................................................................... 33

Cook Cycle ........................................................................................................................................ 33

Timer Cycle .......................................................................................................................................34

Cool Down Cycle (Solid State Temperature Controller) ...................................................................34

SG4C/SG6C with Computer Controller ............................................................................................. 35

Normal Cook Cycle ..................................................................................................................... 35

Temperature and Time Cycle (Normal Cooking)............................................................................... 37

Function Switch (SG4C/SG6C) .........................................................................................................37

Roast and Hold Cycle........................................................................................................................ 37

Wiring Diagrams .......................................................................................................................................38

Schematics .............................................................................................................................................. 40

TROUBLESHOOTING ..........................................................................................................................................42

Error Codes ..............................................................................................................................................44

– 4 –

GENERAL

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INTRODUCTION

Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any model unless the picture or illustration needs to be model specific. All models are equipped with a two-speed 1/2 HP electric motor, porcelain interior and two 30,000 BTU/hr burners as standard equipment. A power level control permits variable burner input from 15,0000 BTU/hr to 60,000 BTU/hr.

Models SG4D and SG6D are equipped with solid state-controls and a 60-minute timer (a 5-hour timer is optional). Models SG4C and SG6C have a computer control with built-in Roast & Hold.

Models SG6D and SG6C have a 4" deeper cavity than models SG4D and SG4C.

INSTALLATION

Generally, installations are made by the dealer or contracted by the dealer or owner. Detailed installation instructions are included in the Installation & Operation Manual which is sent with each unit.

OPERATION

Detailed operation instructions are included with each oven.

CLEANING

Detailed cleaning procedures are included in the Installation & Operation Manual for the appropriate model.

LUBRICATION

Motor bearings are sealed and prelubricated.

Gas Data

TOOLS

Standard

• Hand tools (standard set).

• VOM with AC current tester (any quality VOM with a sensitivity of at least 20,000 ohms per volt can be used).

• Gear puller to remove blower.

Special

• Temperature tester (thermocouple type).

• Manometer

SPECIFICATIONS

Electrical Data

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04206157.3

– 5 –

REMOVAL AND REPLACEMENT OF PARTS

COMPONENT LOCATION

TOP VIEW

BLOWER MOTOR

OVEN LIGHTS

TEMPERATURE PROBE

GAS BURNERS

IGNITER &

FLAME SENSE

HIGH LIMIT

DOOR

SWITCH

COOLING

FAN

COMPONENT

PANEL

GAS VALVE

CONTROL

PANEL

PL-56044

– 6 –

COVERS AND PANELS

RIGHT SIDE

REMOVE SCREWS

CONTROL

PA NE L

OFF

LOW

LIGHTS

FAN SPEED

SG4D SHOWN

ERMO

POWER

LEVE

OFF

COOL

STER

SWITC H

PL-56042-1

BOTTOM FRONT COVER

REMOVE SCREWS

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

Top Front Cover

1. The top front cover is secured with four screws, two on each side of cover. Remove these screws, then remove the cover from the oven.

REMOVE SCREWS

TOP FRONT COVER

OVEN COOL

AST

HEAT

IGNITION

Control Panel

1. Remove three screws on the right side which secure the control panel. Pull the panel away from the oven.

2. Disconnect the temperature probe leads from the solid state temperature controller.

3. Unplug the wire harness connector to the control panel components.

PL-56040

2. Reverse the procedure to install.

Bottom Front Cover

1. The bottom front cover is secured with six screws, two on each side of cover and two on the top. Remove these screws then remove the cover from the oven.

REMOVE SCREWS

BOTTOM FRONT COVER

2. Reverse the procedure to install.

4. Reverse the procedure to install.

Right Side Panel

1. Remove the screws that secure the right side of the control panel.

2. Remove the remaining screws securing the right side panel.

3. Pull the right-side panel out at the bottom then down to remove.

RIGHT SIDE

REMOVE SCREWS

PL-56041

PL-56043

4. Reverse the procedure to install.

– 7 –

CONTROL PANEL COMPONENTS

O COOL

FAN

SPEED

MASTER SWITCH

OFF

THERMOSTAT

POWER LEVEL

TIMER

LOW

MASTER SWITCH

ON/HEAT INDICATOR LIGHTS

NO IGNITION LIGHT

COMPUTER CONTROLLER

TEMPERATURE CONTROLLER (THERMOSTAT)

POWER CONTROL

NO IGNITION

LIGHTS

OFF

TIMER

FAN SPEED SWITCH

LIGHT SWITCH

WER

LIG

OOL

LIGHT

POWER SWITCH

LIGHT SWITCH

SG4D/SG6D

Procedure

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

2. Remove the component being replaced.

3. Reverse the procedure to install the new component, then check oven for proper operation.

procedures.

SG4C/SG6C

PL-56045-1

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

– 8 –

PL-56046

COMPONENT PANEL COMPONENTS

PORCELAIN BLOCK ASSEMBLY

TRANSFORMER

HEATING RELAY

IGNITION MODULE BOARD

PORCELAIN BLOCK ASSEMBLY

TRANSFORMER

MOTOR CONTROL RELAYS

IGNITION MODULE BOARD

PORCELAIN BLOCK ASSEMBLY

Procedure

SG4D/SG6D

procedures.

IGNITION MODULE

PL-56047

HEATING RELAY

PORCELAIN BLOCK ASSEMBLY

SG4C/SG6C

IGNITION MODULE

PL-56048

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

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

2. Disconnect the wire leads to the component being replaced.

3. Remove the component.

4. Reverse the procedure to install the new component and check oven for proper operation.

– 9 –

TEMPERATURE PROBE

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

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

2. Disconnect probe leads from the solid state temperature controller on the SG4D/SG6D or the computer controller on the SG4C/SG6C.

3. Remove the racks and right rack support.

7. Remove the probe from the bracket(s).

4. Remove the upper and lower door seals.

5. Loosen the three screws securing the right side air scoop to the rear heat exchanger. Rotate the air scoop off of the heat exchanger tube into the oven cavity.

6. Remove the screws that secure the perforated side panel and lift out.

SG4C/SG6C Temperature Probe Shown

8. Push the probe through the oven wall and into the control panel area.

9. Reverse the procedure to install the new probe.

10. Calibration:

A. SG4D/SG6D: Adjust the temperature

controller as outlined under Solid State Control Calibration.

B. SG4C/SG6C: Adjust the computer

controller as outlined under Computer Controller and/or Computer Controller Calibration in Service Procedures and Adjustments.

– 10 –

GAS BURNERS

5. Reverse the procedure to install and check for proper operation.

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. There are two burners located on the bottom left and right side of the oven. Disconnect the ignition cable and the flame sense lead from each burner.

A. Ensure the spacers are in place on the

ignition wires. The spacers are intended to keep the ignition wires from laying flat on the oven chassis.

B. Ensure that the bracket on the back of

the burner is inserted into the slot at the rear of the burner chamber.

Note: Check the flame current by following the Flame Current Measurement procedures under the Procedures and Adjustments Section of this manual.

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

4. Grasp the burner and lift out.

– 11 –

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.

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.

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

GAS SOLENOID VALVE

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 –

IGNITION CONTROL MODULE

SPARK IGNITER AND FLAME SENSE

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

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

2. Loosen the screws securing the mounting bracket to the component panel and remove 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 two gas burners as outlined under Gas Burners.

2. Remove the screws securing the igniter and flame sense to each burner. Remove the assembly.

3. Disconnect the lead wires and igniter cables from the ignition module board.

4. Remove the ignition module board from the mounting bracket.

5. Reverse the procedure to install the replacement ignition module board.

6. Check for proper operation.

3. The spark gap is 1/8" from the inside of the spark rod to the inside to the ground rod. The ground rod (the end of the spark) is 1/8" above the burner. If the gap is not correct or poor sparking is occurring, then adjust accordingly.

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

– 13 –

BLOWER AND MOTOR

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

1. Remove racks.

2. Remove the screws securing the snorkel and remove the snorkel.

5. Remove the screws that secure the motor mounting plate to the rear wall.

6. Place a piece of cardboard on the bottom of the oven cavity to protect its surface from any damage during motor assembly removal.

3. Remove screws securing baffle panel and remove the panel.

4. If replacing:

A. Blower Only - Loosen set screws on

blower hub and using a bearing puller, remove blower from motor shaft.

1) Reverse procedure to install and adjust blower position as outlined under the Blower Adjustment in Service Procedures and Adjustments section.

B. Motor - Perform step 4A and continue

procedure.

7. Pull the motor assembly into the oven cavity and place it on the cardboard.

8. Remove the junction box cover from the motor, disconnect lead wires and remove the conduit.

9. Remove motor mounting bolts and flat washers, then lift the motor from the mounting plate.

10. Position the replacement motor on the motor mounting plate and install mounting bolts and washers. Hand tighten mounting bolts only.

11. Reconnect to lead wires at the motor, and replace conduit and junction box cover.

– 14 –

FRONT VIEW OF MOTOR

FROM INSIDE OVEN CAVITY

OVEN DOORS AND BEARINGS

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

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

2. Remove the door switch lever.

MOTOR ROTATES CLOCKWISE

PL-56051

12. Slide blower onto motor shaft until hub is flush with end of shaft, then tighten setscrews.

13. Adjust motor position until blower is parallel to motor mounting plate as outlined in Blower Adjustment under Service Procedures and Adjustments.

14. Position motor mounting plate on the rear wall and secure with nuts and washers.

15. Replace the baffle panel and snorkel.

16. Replace the air baffle on the rear wall at the lower right hand corner.

17. Remove cardboard from the bottom of the oven cavity.

18. Install racks.

19. Check oven for proper operation.

3. Remove the lower door seal strip to expose the mounting screws of the door assembly.

4. Remove the two lower sill bolts by the lower door shaft and the four countersunk screws from the lower sill.

A. The door assembly is heavy and will drop

down once the last screw is removed. If removing the door assembly without assistance, the ignition cable, flame sense lead and gas manifold should also be removed to avoid damage to these components.

– 15 –

5. Tilt the top of the door slightly forward and lift the door up until the bottom of the door shaft clears the opening in the sill.

6. Lay the door flat to prevent damage.

7. The top and bottom bearings are now accessible for inspection and/or replacement if needed.

DOOR CATCH ROLLER ASSEMBLY

(INDEPENDENT DOORS)

A. If bearings are OK, proceed to step 8.

B. If replacing the top bearing, remove the

top bearing retainer and top bearing.

C. If replacing the bottom bearing, remove it

from the door shaft or the lower sill opening.

8. Reverse procedure to install door assembly and check for proper operation as outlined under the Door Adjustment and Door Switch Adjustment section in Procedures and Adjustments.

ROLLER LATCH ASSEMBLY

(INDEPENDENT DOORS)

NOTE: For units with serial number starting with 48

made after 8/12/07 and serial number starting with 54 made after 8/26/07.

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

NOTE: For units with serial number starting with 48

made before 8/13/07 and serial number starting with 54 made before 8/27/07.

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

1. Remove the top front cover as outlined under COVERS AND PANELS.

2. Remove the nuts and bolts that secure the door catch assembly.

3. Reverse the procedure to install.

4. Adjust the roller catch as outlined under the Door Catch Adjustment in Service Procedures and Adjustments.

DOOR WINDOW

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

1. Remove the screws at the top and bottom of the door.

1. Remove the screws that attach roller latch assembly to door.

2. Reverse procedure to install.

– 16 –

REMOVE SCREWS

OVEN CAVITY

GLASS

PL-56052

2. Remove the door handle, then remove the outer door panel.

DOOR SWITCH

3. Lift out the inner door panel window assembly.

4. Remove the door seal from the inside of the left door only.

5. Remove the screws securing the window tabs to the door bracket and lift the window assembly out from the door frame.

INNER DOOR PANEL ASSEMBLY

GLASS

REMOVE

SCREWS

GLASS

PL-56053

6. Reverse procedure to install the replacement window.

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

1. Remove the top front cover as outlined under Covers and Panel.

2. Disconnect the lead wires to the door switch.

3. Remove the switch.

4. Reverse procedure to install the replacement switch and check for proper adjustment as outlined in Door Switch under Service Procedures and Adjustments.

– 17 –

HIGH LIMIT THERMOSTAT

INTERIOR LIGHTS

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

1. Remove the top four racks from the oven.

2. Remove the high limit thermostat cover/ mounting plate. It is located at the top of the oven cavity.

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

1. Remove the racks from the oven.

2. Unscrew the glass lens for the light being replaced, then unscrew the bulb.

LENS

OVEN CAVITY

LENS

PL-56054

3. Replace bulb, then reverse the procedure to install.

3. Disconnect the lead wires from the high limit thermostat. Remove the high limit thermostat from the cover mounting plate.

4. Remove the old RTV silicone from the cover and mating surfaces inside the oven cavity, and apply new RTV silicone before installing.

5. Reverse procedure to install.

Lamp Assembly

1. Remove the lens and bulb.

2. Remove the springs from the retaining tabs (two places) on the socket.

RETAINING TABS

SPRING

CROSS SECTIONAL VIEW

3. Depress the retaining tabs and pull the socket out from the oven, far enough to disconnect the lead wires.

4. Remove the socket from the oven.

PL-56055

– 18 –

5. Attach the lead wires to the replacement socket.

NOTE: Ensure the case is connected to the green ground wire.

6. Insert the socket into the hole in the oven and push until the socket is held in place by the retaining tabs.

7. Install the light bulb and lens.

8. Check for proper operation.

COOLING FAN

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

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

2. Disconnect the lead wires to the fan motor by removing the wire nuts.

Fan Installation Tips

• The fan must be installed so air is pulled from the rear of the oven and blown into the control area. The arrow on the fan body indicates airflow direction and should be pointing toward the controls.

• Ensure the fan is seated squarely against the air tube and the oven bottom.

• The air deflector should be angled upward at approximately 30 degrees to properly direct the airflow.

3. Remove the screws securing the air deflector to the fan, then loosen the tab screw holding the fan to the component panel. Rotate the tab so that the fan will clear. Remove the fan.

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

– 19 –

SERVICE PROCEDURES AND ADJUSTMENTS

Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times. If test points are not easily accessible, discern power, attach test equipment and reapply power to test.

SOLID STATE TEMPERATURE

CONTROLLER TEST

(SG4D/SG6D)

Test Steps

1. Remove the right side panel as outlined under Cover and Panels in Removal and Replacement of Parts.

2. Place a thermocouple in the geometric center of the oven cavity. Oven temperature must be below 450°F.

3. Set the temperature control to the maximum setting.

4. Set the power control to 100%.

5. Check machine data plate for correct voltage to oven. Refer to diagram below for proper terminal locations and voltages before checking temperature controller. Use the correct terminals for the corresponding voltage.

6. Turn the ON-OFF-OVEN-COOL switch to ON.

8. Check for voltage to the switching output.

a. For 120 VAC controls, check across

terminals J3 and J4 for input voltage and between J4 and J5 for output voltage from the internal switching device.

b. For 208/240 VAC controls, check across

terminals J3 and J9 for input voltage and between J9 and J5 for output voltage from the internal switching device.

1) If input voltage is correct, proceed to step 9. If input voltage is not present, the problem is not in the controller (See Troubleshooting).

2) If output voltage is correct, proceed to step 9. If output voltage is not correct, check temperature probe, as outlined under Temperature Probe Test (SG4D/SG6D).

c. If the probe connected to J6 and J7 is

either shorted or opened, the red LED located just above J6 (to the left of J6 when mounted) will flash. With the probe connected and the LED not flashing, slowly turn the Temperature set knob until the pointer passes through the mid point of rotation. At the mid point of rotation, the red LED will come on. If the control is set and left at the mid point, the LED will stay on. With the LED on at mid point, you have tested the entire front end of the control circuit as well as the probe and verified that the control is functioning normally.

7. Check for voltage across terminals J2 and J4 (120 Volt) or J2 and J9 (208/240 Volt) for power to the control.

a. If correct, proceed to step 8.

b. If incorrect, the problem is not in the

temperature control (see Troubleshooting).

9. Set temperature control to minimum setting. Oven temperature must be above 300°F.

10. Check for zero volts (0.00 Volts) across terminals J4 and J5 (120 Volt) or J9 and J5 (208/240 Volt) for no output from the internal switching device.

a. If correct, temperature control is

functioning properly.

– 20 –

b. If incorrect, check temperature probe as

outlined under Temperature Probe Test (SG4D/SG6D).

1) If temperature probe is functioning properly and the temperature controller failed the test in 8c above, replace the temperature control and check for calibration as outlined under Solid State Temperature Controller Calibration (SG4D/SG6D).

SOLID STATE TEMPERATURE

CONTROL CALIBRATION

(SG4D/SG6D)

Before attempting any calibration, see Section 8C of SOLID STATE TEMPERATURE CONTROLLER TEST (SG4D/SG6D) on previous page.

Calibration Steps

1. Place a thermocouple in the geometric center of the oven cavity.

2. Set the ON/OFF/OVEN COOL switch to ON.

3. Set the temperature controller dial to 350°F. Set the power control to 100% (10).

4. Allow the oven temperature to stabilize (minimum three heating cycles).

5. Record the temperature at which the Heat lamp comes ON (heating starts) and goes OFF (heating stops). This is the control differential. Heat lamp OFF temp - Heat lamp ON temp = Control Differential.

6. The nominal control differential should be less than 20°F.

7. Calculate the average oven temperature by adding the actual minimum temperature to the actual maximum temperature and dividing by 2.

EXAMPLE: Oven set to 350°F. Actual minimum oven temperature = 335°F Control cuts on at 334°F Actual maximum oven temperature = 347°F Control cuts off at 340°F 335 + 347 = 682 682/ 2 = 341 (the control is 9°F out of calibration) 340 - 334 = 6°F Control Differential 347 - 335 = 12°F Oven Temperature Differential

A. If the average oven temperature is within

+/- 5°F from the dial setting, no calibration is necessary.

B. If the average oven temperature is not

within +/- 5°F, calibration is recommended.

8. Loosen the set screw on the temperature controller and carefully remove the knob from the shaft, without rotating the shaft. This will expose the calibration adjustment control access hole in the front panel.

9. Monitor the internal oven temperature and determine at what temperature the control should cut on to give you the required minimum temperature (Example: 350-341=9; 334+9=341. 341°F is the temperature at which you would wish the controller to cut on).

10. After allowing the oven to operate through several cycles (minimum 3 cycles), monitor the temperature as it falls to the desired "cuts on" point. Using a small screw driver, adjust the calibration adjustment until the controller cuts on at the desired "cuts on" temperature.

A. If the control differential is less than

20°F, the temperature control circuit is functioning properly. Proceed to step 7.

B. If the control differential is more than

20°F, check the temperature probe as outlined under Temperature Probe Test (SG4D/SG6D).

C. If the control differential is more than

20°F and the probe passes its' test parameters, then temperature controller is malfunctioning. Install a new temperature controller and run calibration steps again.

– 21 –

11. The calibration control is adjusted clockwise in order to increase the set temperature and counter clockwise to decrease the set temperature.

12. The controller has only +/- 25°F of adjustment.

/4 turn of the calibration adjustment represents

approximately 20°F shift in calibration.

TEMPERATURE PROBE TEST (SG4D/SG6D)

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

procedures.

The temperature probe used in conjunction with the Solid State Temperature controller is an RTD (resistance temperature detector) of the Thermistor type. As temperature increases the resistance value decreases.

Test Steps

1. Remove the right side panel as outlined under Cover and Panels in Removal and Replacement of Parts.

2. Place a shielded thermocouple in the geometric center of the oven cavity and determine the temperature in the oven cavity.

3. Remove the probe lead wires from the solid state temperature controller.

4. Test the probe with an ohmmeter.

A. If the measured resistance values are inside the given tolerance, then the probe is functioning properly.

B. If the measured resistance values are outside the given tolerance, then replace the probe and make

sure wires are secured to the terminals of the temperature controller. Recheck the temperature by preforming step 2.

1) Check the oven for proper operation.

5. Reverse Procedure to install.

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– 22 –

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COMPUTER CONTROLLER

(SG4C/SG6C)

3. Listed are the parameters and data in the setup mode.

Operation

Refer to the Installation & Operation Manual for specific operating instructions.

Setup Mode

Use the setup mode to verify that the control is configured to the factory settings which result in the proper operation of the oven. If the CAL1 parameter is other than zero, see Computer Control Calibration (SG4C/SG6C).

CAUTION: Changing the C_F, InP1, rL1 and rH1 parameters will default all menus.

1. Use this key sequence to access the setup mode: UP arrow, Rack 1, Temperature, Temperature, DOWN arrow, Rack 1.

PL-56075

2. Once in the setup mode the display will alternate between the parameter and programmed data.

A. To change data to the factory setting,

use the arrow keys.

B. To select the next parameter, press the

Rack 1 key.

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Probe Test

If the oven is not heating or displaying the proper temperature, the temperature probe may be malfunctioning. Determine if the probe is good or causing the operational problem.

C. After the last parameter and data are

viewed, press the Rack 1 key to exit the setup mode and return to operations mode. The current set point temperature will be displayed.

D. If there are no key activations after 1

minute, the control will return to operation mode.

1. Temporarily disconnect the existing lead wires from the computer control and connect them to a good J-type thermocouple.

2. Turn the power switch to ON and set the temperature controller to 350°F.

A. If the oven reaches the set temperature

and cycles with the temporary thermocouple, then the existing probe is malfunctioning.

3. Replace the temperature probe with the correct part and check for proper operation.

– 23 –

Solid State Relay Test

1. Remove the right side panels as outlined under Covers and Panels in Removal and Replacement of Parts.

C. Press the set key again to save the change,

then exit the temperature set mode.

4. Allow the oven temperature to stabilize (normally three cycles).

2. Turn the power switch to the ON position.

3. Check for +5 VDC on input side of SSR-1 in the normal heating mode (terminals 3 & 4) and SSR-2 in the roast and hold mode.

A. If +5 VDC is present, continue to step 4.

B. If no voltage is present, computer control

is not functioning properly.

4. Check for 120 VAC at load side of SSR (terminals 1 & 2).

A. If no voltage is present, solid state relay

is not functioning properly.

1) Replace the SSR and check for proper operation.

B. If 120 VAC is present, component is

functioning properly.

5. Reassemble oven and check for proper operation.

5. Compare the controls set point temperature to the thermocouple meter reading when the heat light goes out.

A. A temperature variance more than 5°F

indicates an adjustment is needed.

1) To make the adjustment, proceed to step 6.

2) If temperature variances is less than 5°F, then the computer control is functioning properly.

6. Enter the setup mode as outline in Setup Mode under Computer Control (SG4C/SG6C).

A. Advance through the menu until CAL1

(calibration offset) appears.

1) If the thermocouple reading is higher than set point temperature, press the down arrow key and enter a negative offset value that is equal to the number of degrees above the 5°F tolerance.

COMPUTER CONTROL CALIBRATION

(SG4C/SG6C)

Calibration Steps

1. Place a thermocouple in the geometric center of the oven cavity.

2. Set the ON-OFF-COOL DOWN switch to ON.

A. If the set point temperature is 350°F,

proceed to step 4.

B. If the set point temperature is other than

350°F, proceed to step 3 to change the temperature.

3. Press the set key then temperature key to enter the temperature set mode.

A. The display will alternate between the

term StPt (set point) and the current oven temperature setting.

B. Press the UP or DOWN arrows to make

the proper selection.

2) If the thermocouple reading is lower than set point temperature, press the UP arrow and enter a positive offset value that is equal to the number of degrees below the 5°F tolerance.

3) Exit the setup mode.

7. Allow the oven to cycle at least two times between adjustments.

A. If the temperature variance still differs

more than 5°F from the set point, verify the correct calibration offset value was entered and retained.

1) Adjust the calibration offset value as outlined in step 6, until the cycling temperature is within tolerance.

B. If the above adjustment cannot be

obtained, replace the computer control and check for proper operation.

– 24 –

GAS PRESSURE ADJUSTMENT

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EPYT

).C.WNI(SGNIDAERERUSSERP

DLOFINAM

ENIL

DEDNEMMOCERNIMXAM

larutaN5.30.70.5

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

Accurate gas pressure adjustments can only be made with the gas on and the burner lit. If the incoming line pressure to the valve is less than the minimum stated, then the manifold pressure cannot be set correctly.

1. Turn gas supply off at manual shutoff valve.

2. Remove the right side panel as outlined under Covers and Panels in Removal and Replacement of Parts.

3. Remove the plug from the manifold pressure port.

4. Install hose barb adapter and attach manometer tube.

5. Remove adjustment screw cap from the gas valve and turn gas supply to the oven back on.

The following steps require power to be applied to the unit during test. Use extreme caution at all times.

6. Plug the unit in and turn the power switch ON.

7. Set the temperature controller to its highest setting and allow burner to ignite. The burner must be lit during test and adjustment.

8. Turn the set screw to obtain the proper gas pressure (clockwise = pressure increase; counterclockwise = pressure decrease).

– 25 –

VERIFICATION OF SPARK AT IGNITOR

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

The following steps require power to be applied to the unit during the test. Use extreme caution at all times.

4. Plug the oven in and set the temperature controller to the maximum setting.

5. Turn the power switch ON.

Shut off the gas before servicing

the oven.

1. Remove the bottom front cover as outlined under Covers and Panels in Removal and Replacement of Parts.

2. Disconnect the high voltage ignition cable from the spark igniter.

Do not hold the wire with your hands for this test. The manual gas valve must be closed.

3. Clamp the ignition cable in a manner that will position the end of the cable 3/16" from the oven frame (bare metal surface). It is critical that the cable be held 3/16" away from the surface of the oven frame or sparking may not occur even though the sparking circuit is functioning properly.

6. Sparking should occur after a 4 second delay and continue for 7 seconds. The cycle will repeat twice after a 15 second purge time. Arcing from the ignition cable to the oven frame should be observed.

DOOR SWITCH ADJUSTMENT

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

1. Remove the top front cover as outlined under Covers and panels in Removal and Replacement of Parts.

2. Door operation:

A. The switch actuator is engaged by the

switch lever when the right door is between 1" and 1 1/2" from being closed.

3. If adjustment is necessary, bend the switch actuator to obtain the proper setting.

– 26 –

4. Install the top front cover.

5. Apply power to the oven and check for proper operation.

FLAME CURRENT MEASUREMENT

BLOWER ADJUSTMENT

MICROAMP METER

FENWAL

LED

DIAGNOSTIC

INDICATOR

DUAL

345519-4

424471-G1

C-2

417856-1

123

GND.

CONNECT 200-240 VOLT SUPPLY TO L1 & L2

FC2-

FC2+

FC1-

FC1+

L2L1

CHANNEL IGNITION

MODULE

SPARK OUT

WHITE

GREEN

BLACK

RED

24V

GND

SPARK OUT

120 VOLT UNITS PROVIDED WITH 3 PRONG GROUNDED PLUG.

LEFT RIGHT BURNER BURNER

1. Use a Microampere (µamp) meter to measure the flame current on both wires S1 & S2.

2. Connect a Microampere meter as shown above to S1 & S2, to read the actual flame current of each igniter.

3. The ignition system is 1 µamp sensitive.

4. You should be able to attain a reading of 4 µamps when connected as shown.

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

1. Remove the blower motor and mounting assembly as outlined under Blower and Motor in Removal and Replacement of Parts.

2. Loosen the motor mounting bolts.

3. Adjust the motor position until the blower is parallel to and 1/4" inch away from the motor mounting plate. Check to see if the blower is square to the motor mounting plate at the top, bottom, left and right of the blower.

A. If the blower is square, then tighten

motor mounting bolts and proceed to step 4.

B. If the blower is not square, continue

adjusting until proper spacing is achieved then tighten motor mounting bolts. If necessary, place shims between motor and frame.

5. The meter is to be placed in series with the flame sense wires S1 & S2.

6. Connect at the board or the igniter end, whichever is more convenient.

PLACE SHIMS UNDER REAR OF MOTOR TO WIDEN TOP SPACE.

PLACE SHIMS HERE WHEN NEEDED.

FLAT WASHER

MOTOR

FRAME

FLAT WASHER

NUT/STAR WASHER

PLACE SHIMS UNDER FRONT OF MOTOR TO WIDEN BOTTOM SPACE.

MOTOR MOUNTING PLATE

1/4 INCH AT ALL PLACES

TOP

BLOWER

BOTTOM

PL-56058

4. Reverse the procedure to install. Use locktight on mounting nuts and bolts.

– 27 –

DOOR ADJUSTMENT

DOOR STRIKE ADJUSTMENT

(INDEPENDENT DOORS)

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

1. Check the doors to make sure they have an equal gap between them and that the vertical edge of the door is parallel to the vertical door seal. If the doors are not positioned in this manner, adjust the doors as described.

EQUAL GAP

PL-56059-1

NOTE: For units with serial number starting with 48 made after 8/12/07 and serial number starting with 54 made after 8/26/07.

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

1. Remove the top front cover as outlined under COVERS AND PANELS in REMOVAL AND REPLACEMENT OF PARTS.

2. Open the doors and inspect the door strike for proper shape.

A. Replace if bent. Do not bend strike plate.

B. If adjustment is necessary, loosen

fasteners, close doors and insure contact between the door inner surface and upper horizontal seal. Slide door strike plate until contact with roll latch is made. Tighten strike plate fasteners.

2. Remove the top front cover.

3. Loosen the screws that secure the upper door bearings and related hardware, just enough to allow door movement.

UPPER

BEARING

DOOR

SHAFT

LOOSEN SCREWS

PL-56060

4. Move the door until proper alignment is achieved, then tighten the screws on the upper door bearing hardware.

5. Repeat steps 3 and 4 on the opposite door if necessary.

3. Open and close the doors several times while observing the roller latch and strike plate operation.

A. Replace roller latch if malfunctioning as

outlined under ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) and adjust as outlined in this procedure.

4. Each oven door should be open with a force of 8 to 25 pounds when pulled at the handle. The adjustments must allow the doors to remain closed during normal operation and allow opening without exertion by the user.

6. If one door is higher than the other, add or remove shims under hinge pin as needed.

– 28 –

DOOR CATCH ROLLER ADJUSTMENT

NOTE: For units with serial number starting with 48

made before 8/13/07 and serial number starting with 54 made before 8/27/07.

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

1. Remove the top front cover as outlined under Cover and Panels in Removal and Replacement of Parts.

2. Inspect the door strike to make sure it is straight, and replace if bent.

3. Inspect the door catch assembly, and replace if it is damaged.

4. Check for proper door alignment.

A. Doors should be centered in the cavity

opening and parallel to top and bottom of oven as outlined under Door Adjustment.

6. Place a standard flat screwdriver through the opening in the top channel into the slot in the cylinder of the catch assembly.

5. With the door in closed position, check to see that the ball of the catch is centered and touching the door strike. If not, if may be necessary to adjust and add a shim piece to the door strike.

7. Turn the screwdriver clockwise to increase the ball pressure or counterclockwise to decrease the pressure onto the door strike. The ball pressure should be tight enough to hold the door in place when the blower is engaged.

8. After the adjustment is complete, lubricate the inside of the door catch cylinder.

– 29 –

ELECTRICAL OPERATION

COMPONENT DESCRIPTION

Master Switch (S1) - Determines the mode of

operation; ON, OFF or OVEN COOL

Lights Switch (S2) - Controls the oven cavity lights.

Fan Speed Switch Hi/Low (S3) - Controls blower

motor speed between HI and LOW settings. Available on models SG4D/SG6D.

Alarm/Buzzer - Signals the end of the normal cook cycle when cooking time expires.

Timer - Times the cooking cycle and signals the buzzer at the end of the cycle.

Door Switch - Allows the oven to operate when the doors are closed but stops the oven from operating when the doors are opened.

Blower Motor - Operates the oven cavity blower. Also, an internal centrifugal switch on the motor is utilized to allow the connection of power to the heat relay when the motor is at operating speed.

Transformer (T1) - Provides 24 VAC power to the ignition control module and heating circuit.

Motor Control Relay(s) (SG4C/SG6C) - Provides power to HI and LOW speed motor windings based on operator requirements.

Solid State Temperature Controller

(SG4D/SG6D) - Monitors temperature sensor and regulates the oven cavity temperature by controlling the heat relay through the blower motor centrifugal switch contacts.

Ignition Control Module - Provide ignition spark and monitors burner(s) flame current during ignition sequence.

No Ignition Light (SG4C/SG6C) - Lit when power is turned ON, during ignition trial and gas purge time and when no flame is detected by flame sensor. If the oven fails to ignite after three attempts, it will remain lit until power is reset.

Temperature Probe (SG4D/SG6D) - This temperature probe is a thermistor device. A thermistor is a calibrated resistor which changes resistance with the temperature. As the temperature increases, the resistance of the thermistor decreases. The resistance of the probe is compared to the resistance of the temperature controller resistor in to control and maintain temperature.

Temperature Probe (SG4C/SG6C) - This temperature probe is a J-type thermocouple. As the temperature increases, a DC voltage is generated within this thermocouple and compared to a list of temperature values stored within the cooking computer memory to control and maintain temperature.

High Limit Thermostat - Protects the oven from temperatures above 550°F by removing power from the first valve (safety) on the dual solenoid gas valve which stops the flow of gas to the burner. Auto resets at 500°F.

Gas Valve (Dual Solenoid) - Contains two valves. The first valve is opened when the unit is turned on and the limit temperature is not exceeded. The second valve is turned by the heating system. Both valves must be open in order to get gas to the main burners.

SSR1 and SSR2 (SG4C/SG6C) - When SSR1 is energized, it connects power to the blower motor for HI fan speed operation. When SSR2 is energized, it connects power to blower motor for LOW speed operation.

Cooling Fan - Circulates cooler air from rear of oven forward to cool components in the control area.

Ignition Electrode and Flame Sense Device - Ignites the gas and senses the presence of a flame. The flame presence generates a micro-amp flame sense current that is monitored by the ignition control module. A flame sense current of 1 micro amp (minimum and stable) is required to maintain burner ignition.

Power On Light (SG4D/SG6D) - Lit whenever the Master Switch (S1) is turned to ON or OVEN COOL mode.

Heat Light - Lit whenever temperature controller is calling for heat.

Computer Control (SG4C/SG6C) - Monitors temperature sensor and regulates the oven cavity temperature by controlling the heat relay (R1) through the blower motor centrifugal switch contacts. Also, counts the time of the product and signals the electronic alarm at the end of the cook cycle.

Power Level Control - Selects the percent of heat input between 22% and 100%. Power level must be on for oven to work.

– 30 –

Plug, Socket and Components (SG4D/SG6D)

SOLID STATE

THERMOSTAT

COOK TIMER

LIGHT SWITCH

CONTROL PANEL

(REAR VIEW)

1 2

3 6

1LT

HEAT

2LT

3 LT

5 COM 6

3 NO 7

2 (COM AC)

4 (120VAC)

9 (240VAC)

NO IGNITION

124

3 6

1 2

336

4 5

ON/OFF/

COOLDOWN

SWITCH

INDICATOR

LIGHTS

POWER

CONTROL

FAN SWITCH

PORCELAIN BLOCK ASSEMBLY

HEAT

RELAY

(R3)

PORCELAIN BLOCK ASSEMBLY

COMPONENT PANEL

(FRONT VIEW)

TRANSFORMER

OUT

5 8

912

13 14

GROUND

IGNITION CONTROL MODULE

BUZZER

1112

1P (FEMALE)

(PLUGS VIEWED FROM PIN SIDE)

– 31 –

1110

PL-56081-1

Plug, Socket and Components (SG4C/SG6C)

COMPUTER CONTROLLER

CONTROL PANEL

(REAR VIEW)

2J (FEMALE)

789

PIN NUMBERS

456

123

1 EVENT 2 OUT 2 EVENT 1 OUT 3 EVENT COM (IN) 4 EVENT 1 (IN) 5 EVENT 4 OUT 6 EVENT 3 OUT 7 NOT USED 8 POWER 5V 9 EVENT 2 (IN)

23456

1 NOT USED

2 TC

3 TC J TYPE (RED) 4 NOT LISTED

3J (FEMALE)

OPER. TEMP.

0-30 DEG. C

12 9 6

11 8 5

10 7 4

1 NOT USED 7 NOT USED 2 SSRI 8 NOT USED 3 SSRI 9 L2 24V- 4 NOT USED 10 NOT USED 5 NOT USED 11 NOT USED 6 L1 24V- 12 NOT USED

5 NOT USED 6 NOT USED

PORCELAIN BLOCK ASSEMBLY

HEAT

RELAY

(R1)

COMPONENT PANEL

(FRONT VIEW)

NHIN

TRANSFORMER

OUT

LOAD

INPUT LOAD

INPUT

912

SOLID STATE RELAY (SSR1)

SOLID STATE RELAY (SSR2)

IGNITION CONTROL MODULE

LIGHT

SWITCH

ELECTRONIC

BEEPER

1P (MALE)

2221

1817

1413

109

13 14

PORCELAIN

12NO IGNITION

1LT

ON/OFF/

COOLDOWN

SWITCH

BLOCK ASSEMBLY

GROUND

1J (FEMALE)

2122

2324

2423

2P (MALE)

3P (MALE)

2019

1615

1211

56 4

23 1

1297

118

107

1920

1516

1112

(PLUGS VIEWED FROM PIN SIDE)

1718

1314

(PLUGS VIEWED FROM

PIN SIDE)

910

PL-56082

– 32 –

SEQUENCE OF OPERATIONS

2. Set temperature controller dial to desired temperature.

SG4D/SG6D with Solid State Temperature Controller

Schematic 424373-1 will be used to explain the electrical sequence of operation.

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: L1 of the power level control, power ON light, heat light, temperature controller board terminal 9 (120VAC) or terminal 10 (208-240 VAC), oven cavity lights, buzzer, timer motor, heat relay coil (R3), convection fan motor common (C), transformer primary T1), motor speed (Hi/Low) relay coil (R1), hold relay coil (R2) and the component cooling fan.

B. Oven properly grounded.

C. Gas supply valve ON.

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

A. Contacts J3 and J5 close.

3. Power switch (S1) is turned ON.

NOTE: Power is available to the oven light switch

A. Component cooling fan energized.

B. ON light (amber) is lit.

C. Power to timer terminal C.

D. Transformer (T1) energized.

1) Power (24 VAC) to one side of the following components: heat relay (R3) normally open (N.O.) contact.

2) First valve (safety) on the gas valve energized. Gas does not flow to the burner until the 2nd valve (main) is energized.

3) Ignition module energized.

E. Heating light is lit.

F. Power to one side of centrifugal switch.

G. Convection fan motor is energized through

(S3) high-low.

1) When the convection fan motor reaches operating speed, the centrifugal switch (N.O.) on the motor closes.

F. Oven light switch (S2) ON/OFF (position

has no affect on the function of the normal cooking cycle).

G. Temperature controller dial set to lowest

temperature (fully counterclockwise).

H. High limit switch closed (position has no

affect on the function of the normal cooking cycle).

I. Timer in the OFF position.

J. Oven doors closed.

K. Door switch contacts closed.

L. Oven cavity temperature below 140°F.

M. Power level switch to 100%.

H. Heat relay is energized.

1) N.O. contacts close.

(Continued next page)

– 33 –

4. Heating circuit is powered.

Timer Cycle

A. No ignition light (red) comes ON.

B. Module performs a self diagnostic test

for 4 seconds.

C. Second valve (main) on the gas valve is

energized. Gas starts to flow to burners.

D. Sparking begins, the no ignition light

goes out and burners light.

NOTE: Sparking continues for up to 7 seconds or until a flame is established on both burners. If a flame is sensed on both burners, the no ignition light stays out and burner remains lit. If a flame is not sensed on both burners after 7 seconds of sparking, the no ignition light comes back on, second valve (main) on the gas valve is de-energized and gas flow to the burner stops. Ignition trial cycle repeats after a 15 second purge between cycles for two additional tries before locking out. To reset after a lockout, turn power switch (S1) OFF then ON.

5. Oven reaches set temperature.

A. Temperature controller de-energizes

internal relay and the normally open (N.O.) contacts open.

The timer operates independently of the heating cycle. Additional time can be set or the timer can be turned OFF throughout the cooking cycle.

1. With the master switch turned ON, power is supplied to timer.

A. Set the timer to desired time.

B. Contacts 1 & 3 close, timer motor is

energized and timing down begins.

2. Time expires on timer.

A. Contacts 1 & 3 open, timer motor is

de-energized and timing stops.

B. Contacts 1 & 4 close.

1) Buzzer energized and sounds. The buzzer continues to sound until the timer dial is set to the OFF position or additional time is set.

Cool Down Cycle (Solid State Temperature Controller)

1. Conditions.

1) Heat light goes out.

B. Power removed from heat relay.

C. Heat relay normally open (N.O.) contacts

OPEN.

D. Power removed from heating circuit.

1) Second gas valve de-energized.

6. The oven will continue to cycle on the temperature controller until the doors are opened or master switch (S1) is turned to the OFF or OVEN COOL position.

A. Oven is ON.

B. Oven cavity temperature needs to be

lowered.

C. Doors are open.

1) Convection fan de-energized.

2) Thermostat de-energized.

a. Heat light out.

b. Power removed from heat relay.

3) 24 V transformer de-energized.

4) Cooling fan de-energized.

– 34 –

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

SG4C/SG6C with Computer Controller

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.

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).

– 35 –

C. Power to terminal 1 on solid state relay 1

SSR1-load side and solid state relay 2 SSR2-load side.

D. Component cooling fan energized.

E. Transformer (T1) is energized, 24 volt

output.

1) Power (24 VAC) to one side of the following components: heat relay (R1) 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.

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

3) Ignition module energized.

4) Power (24 VAC) to the oven computer control.

3. Control is energized and performs a power on self test before energizing outputs. If the control passes self test, then the outputs are energized and operation sequence continues, If control does not pass self test, then the corresponding error code is displayed.

NOTE: Control retains last temperature set.

B. Heat relay coil (R1) energized.

1) (R1) contacts (N.O.) close and the heating circuit is powered.

2) Oven heat light on the control comes on.

C. Ignition module is energized.

1) Heating circuit is powered.

2) No ignition light (red) comes ON.

3) Module performs a self-diagnostic test for 4 seconds.

4) Second valve (main) on the gas valve is energized. Gas starts to flow to burners.

5) Sparking begins, the no ignition light goes out and burners light.

A. Computer control senses oven cavity

temperature.

1) With the oven cavity temperature below set point, the controls 120 VAC output from pin C3-2 is activated and power is connected to the common (C) side of the blower switch contacts on the convection fan motor.

2) The controls 5 VDC output from pins C2-2 (-) and C2-8 (+) is activated and SSR1 relay is energized.

a. Convection fan motor is

energized (fan speed on HI).

3) When the convection fan motor reaches operating speed:

a. The blower switch (N.O.) on the

motor closes.

4. Oven reaches set point temperature.

A. Computer control deactivates the

120 VAC output to heat relay (R1).

1) Heat relay (R1) de-energized and the normally open (N.O.) contacts open.

B. Power removed from ignition control

module.

1) The second valve (main) on the gas valve is de-energized and gas flow to the burner stops.

– 36 –

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)

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).

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.

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 deenergized.

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.

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.

– 37 –

WIRING DIAGRAMS

– 38 –

WIRING DIAGRAM

734 COMPUTER CONTROL

DUAL BURNER CONVECTION

OVENS 120 & 200 V.

426574 Rev. C

– 39 –

SCHEMATICS

POWER SWITCH

ON/OFF/COOL

SHOWN ON

BLACK

C1-1

120 VOLT

200-240V

GND.

C1-6

POWER ON

POWER LEVEL

4140

WHITE

C1-2

HEATING

4243

THERMOSTAT

PROBE

C1-10

101020

OVEN LAMP SWITCH

DOOR

BUZZER

OPEN

C1-9

C1-3

C3-1

HOLD

SWITCH

WHT. LEAD

C3-2

C1-4

1 HOUR TIMER

40W

OVEN LAMP

40W

OVEN LAMP

9091

9092

C1-7

FAN SPEED

SWITCH

BLUE

YELLOW

FOR 240V. USE BLUE FOR BLACK USE BLACK FOR WHITE

C1-5

HIGH

LOW

COM.

CONVECTION FAN MOTOR 2-SPEED

HEAT RELAY

C1-11

C1-12

ROTATION FROM FRONT

9293

WHITEBLACK

RED

BLACK

YELLOW24V.

YELLOW YELLOW

HEAT RELAY

LIMIT 550 F

24V.

5958

DUAL

CHANNEL

IGNITION

MODULE

C1-8

GND.24V.

NO IGNITION

GND.

2ed VALVE

C2-1

C2-3

COOLING FAN

546

C2-2

1st VALVE

424373-1

GAS CONVECTION OVEN SG4 WITH STD. CONTROL

– 40 –

REV D

GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL

426575-1 REV. C

– 41 –

TROUBLESHOOTING

SMOTPMYS

.egatloveniL

roLOOCNEVOninurt'nseodrotomrewolB

.noitisopNO

.noitisopNOehtninurt'nseodrotomrewolB

.KOsnoitcnufnwoDlooC

t'nseodrotomrewolB

.noitisopNOniKOsnuR.noitisop

.etingitonseodsaG

.krapsoN

.NOtonsithgilnoitingIoN

eodsagtubskrapS

.etingitons

LOOCNEVOninur

iwsnaF

nocretnI

ofsnarT

.noitcnuflamhct

.noit

cnuflamhctiwsrooD

atlovhgih(elbacretingI

.noitcnuflamyalertaeH

.evitareponiremr

.nepotatsomrehttimilhgiH

.noitcnuflameludomnoitingI

.desolcevlavsaglaunaM

.noitcnuflameludomnotingI

SESUACELBISSOP

.noitcnuflamhctiwsretsaM/rewoP

.noitcnuflamgniriwnoitcennocretnI

.evitareponistcatnochctiwsretsaM/rewoP

.noitcnuflamgniriwgnitcennocretnI

.noitcnuflamhctiwsretsaM/rewoP

.noitcnuflamgniriwnoitcen

.esnesemalf/retinginoedortceledetrohS

.NEPO)eg

.evitareponirotomrewolbnihctiwslagufirtneC

.noitcnuflamgniriwgnitcennocretnI

.evitareponiroffoevlavdionelossaG

.erusserpsagtneiciffusniroFFOylppussaG

.noitcnuflamgniriwgnitcennocrenI

.noi

tcnuflamsnoitcennocdaelretingI

.evitareponidnuorgretingI

.emalfniatniamtonlliwtubsetingisaG

cerrocnI

.taehwolroevissecxE

nierusserpsaG

.er

usserpsagtneiciffusnI

.noitcnuflameborperutarepmeT

.noitcnuflamdraoblortnocerutarepmeT

.tneiciffus

.detcurtsborodeggulpecifirosaG

.wolottesebyamlevelrewoP

.detsujdalamronoitcnuflamesnesemalf/retingI

.gnissimrodetcurtsbo,deggulptnevlekronS

.eludomnoitingiotremrofsnartmorfytiralopt

– 42 –

TROUBLESHOOTING

SMOTPMYS SESUACELBISSOP

gninoitcnuftonroevitareponiremitlacinahceM

.ylreporp

.nurtonseodnafgnilooctnenopmoC

gnikoocnevenU

.smelborptnettimretnI

.rellortnocerutarepmetotrewopoN

.gnihsalfsirellortnocehtnoDEL;taehoN .detrohsronepo

eniL

lptnevtsuahxE

eborP

.tcerrocniegatlov

.noitcnuflamremiT

.elbareponirotoM

.noitsubmocrooP

.tcerrocnierusserpsaG

arepmettneibmahgiH

serut

.esoolsnoitcennocgniriW

.noitcnuflamnafgnilooC

.nepohctiwsroodrorooD

.noitcnuflamgniriwgnitcennocretnI

.noitcerid/deepsrotomnafnoitcevnoC

.detcurtsborodeggu

.detcurtsborodeggulptnevlekronS

.degamadrognissimselffabwolfriA

opLOOCNEVOnihctiwsretsaM/rewoP

.noitis

COMPUTER CONTROL MODELS ONLY

MOTPMYS SESUACELBISSOP

.taehtonseodnevO

.renrubsagffognittuhstatsomrehttimilhgiH

.hguonetohtonnevO

.nepohctiwstimilhgiH

.noitcnuflameborP

.noitcnuflamlortnoC

.ffootteslortnoclevelrewoP

.noitcnuflameborP

.noitcnuflamlortnoC

.noitcnuflameborP

puteSeeS.wolotgnittes)1Hr(hgihegnarlortnoC

.)C6GS/C4GS(rellortnoCretupmoCrednuedoM

– 43 –

ERROR CODES

DNAEDOC

MELBORP

kcehcMOR-10rE

rorremus

kcehcMAR-20rE

rorremus

rosnestneibmA-30rE

rorre

ifnoC-40rE

rorre

noitarug

rorremorpEE-5orEatadgnirotselihwssolrewoP.rewoPelcyC

/A1enoZ-60rE

rorrewolfrednu

· epytrosnestcerrocnI

· edistuoerutarepmetgnirusaeM

egnarrosneseht

ESUACELBABORP NOITULOS

noitcnuflamMORlanretnI.rewopelcyC

noitcnuflamMARlanretnI.rewop

F°23wolebsierutarepmettneibmA .lortnocehttaerutarepmettneibmakcehC

noitcnuflamrossecorporciM.rewoPelcyC

elcyC

· tahtyfireV.r

· arofsnoitcennocdnarosneskcehC

.raelc

etemarapputes1PnIehtkcehC

.rosnesehtsehctamti

desrever

noitidnocehtfI.rosnesneporo

lliwrorreeht,devlosersirorreehtgnisuac

· tahtyfireV.r .rosnesehtsehctamti

D/A1enoZ-70rE

rorrewolfrevo

wolfrevokcatS-01rE

rorre

rosnesnepO-11rE

rorre

· epytrosnestcerrocnI

snesdetrohS-21rE

· edistuoerutarepmetgnirusaeM

rosnesnepO

noitcnuflamrossecorporciM

rosnesnepO

egnarrosneseht

· arofsnoitcennocdnarosneskcehC

desrever

.raelc

· arofsnoitcennocdnarosneskcehC

· tahtyfir

· arofsnoitcennocdnarosneskcehC

· tahtyfireV.retemarapputes1PnIehtkcehC

· arofsnoitcennocdnarosneskcehC

.rewoPelcyC

.rosnesehtsehctamti

etemarapputes1PnIehtkcehC

noitidnocehtfI.rosnesneporo

lliwrorreeht,devlosersirorreehtgnisuac

.rosnesneporodesrever

eV.retemarapputes1PnIehtkcehC

.rosnesneporodesrever

FORM 35626 Rev. A (02-08) PRINTED IN U.S.A.

– 44 –

Vulcan-Hart SG4D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual