Vulcan Hart Convection Oven SG4D User Manual

SERVICE MANUAL

SG4 & SG6 SERIES

FULL SIZE GAS

CONVECTION OVENS

MODELS

SG4D

SG4C

SG6D

SG6C

ML-114875

ML-114876

ML-114877

ML-114878

Model SG4D

- 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

performtodetermineifyouhavethenecessarytools,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

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

VULCAN-HART

TEL. (502) 778-2791

DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC

– 1 –

FORM 35626 Rev. A (02-08)

WWW.VULCANHART.COM

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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

ComponentLocation ................................................................................................................................. 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

TemperatureProbe ..................................................................................................................................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

DoorWindow ............................................................................................................................................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 –

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TABLE OF CONTENTS (Cont.)

ComputerController(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

ComponentDescription ...........................................................................................................................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

WiringDiagrams.......................................................................................................................................38

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

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

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

– 4 –

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GENERAL

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.

GasData

INSTALLATION

Model

Input BTU/hr

Manifold Pressure

Generally, installations are made by the dealer or

contractedbythedealerorowner.Detailedinstallation

instructionsareincludedintheInstallation&Operation

Manual which is sent with each unit.

SG4D,

SG4C,

SG6D,

SG6C

Natural

60,000

LP Gas

Natural

LP Gas

3.5" W.C.

(0.9 kPa)

10" W.C.

(2.2 kPa)

60,000

TOOLS

OPERATION

Detailedoperationinstructionsareincludedwitheach

oven.

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).

CLEANING

Detailed cleaning procedures are included in the

Installation & Operation Manual for the appropriate

model.

• Gear puller to remove blower.

Special

LUBRICATION

• Temperature tester (thermocouple type).

• Manometer

Motor bearings are sealed and prelubricated.

SPECIFICATIONS

Electrical Data

Model

Volts

Hertz

Phase

Amps

SG4D

SG4C

SG6D

SG6C

120

208

240

7.5

3.6

3.75

– 5 –

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REMOVAL AND REPLACEMENT OF PARTS

COMPONENT LOCATION

TOP VIEW

BLOWER MOTOR

OVEN LIGHTS

COOLING

FAN

TEMPERATURE PROBE

COMPONENT

PANEL

GAS BURNERS

IGNITER &

FLAME SENSE

GAS VALVE

DOOR

SWITCH

CONTROL

PANEL

HIGH LIMIT

PL-56044

– 6 –

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Control Panel

1. Remove three screws on the right side which

COVERS AND PANELS

secure the control panel. Pull the panel away

from the oven.

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

CONTROL

PANEL

Top Front Cover

MASTER SWITC

OVEN

COOL

OFF

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.

THERMOSTAT

REMOVE

SCREWS

POWER LEVEL

REMOVE SCREWS

TOP FRONT COVER

LIGHTS

FAN SPEED

LOW

OFF

SG4D SHOWN

PL-56042-1

MASTER SWITCH

OVEN

COOL

OFF

2. Disconnectthetemperatureprobeleadsfrom

the solid state temperature controller.

HEAT

IGNITION

3. Unplug the wire harness connector to the

control panel components.

4. Reverse the procedure to install.

PL-56040

Right Side Panel

2. Reverse the procedure to install.

1. Remove the screws that secure the right side

of the control panel.

Bottom Front Cover

2. Remove the remaining screws securing the

right side panel.

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.

3. Pull the right-side panel out at the bottom

then down to remove.

REMOVE SCCREWS

RIGHT SIDE

REMOVE

SCREWS

BOTTOM FRONT COVER

PL-56041

PL-56043

2. Reverse the procedure to install.

4. Reverse the procedure to install.

– 7 –

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CONTROL PANEL COMPONENTS

MASTER SWITCH

MASTER

COOL

SWITCH

OFF

ON/HEAT

INDICATOR

LIGHTS

NO IGNITION

LIGHT

THERMOST

COMPUTER

CONTROLLER

TEMPERATURE

CONTROLLER

(THERMOSTAT)

3 5

3 0

2 5

WER LEVEL

POWER CONTROL

NO IGNITION

LIGHT

TIMER

3 5

3 0

2 5

POWER

SWITCH

WER

FAN SPEED

SWITCH

SPEED

LIGHT

SWITCH

LIGHTS

OOL

LIGHT

SWITCH

OFF

SG4D/SG6D

SG4C/SG6C

PL-56046

PL-56045-1

Procedure

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

procedures.

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.

– 8 –

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COMPONENT PANEL COMPONENTS

PORCELAIN

BLOCK

ASSEMBLY

PORCELAIN

BLOCK

ASSEMBLY

TRANSFORMER

MOTOR

CONTROL

RELAYS

HEATING

RELAY

IGNITION

MODULE

BOARD

IGNITION

MODULE

BOARD

IGNITION

MODULE

IGNITION

MODULE

HEATING

RELAY

PORCELAIN

BLOCK

ASSEMBLY

PORCELAIN

BLOCK

ASSEMBLY

SG4D/SG6D

PL-56047

SG4C/SG6C

PL-56048

Procedure

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 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 –

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

TEMPERATURE PROBE

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

1. Removetheright-sidepanelasoutlinedunder

Covers and Panels.

2. Disconnect probe leads from the solid state

temperaturecontrollerontheSG4D/SG6Dor

the computer controller on the SG4C/SG6C.

3. Remove the racks and right rack support.

4. Remove the upper and lower door seals.

SG4C/SG6C Temperature Probe Shown

8. Pushtheprobethroughtheovenwall andinto

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

ControlCalibration.

B. SG4C/SG6C: Adjust the computer

controller as outlined under Computer

Controller and/or Computer Controller

Calibration in Service Procedures and

Adjustments.

5. Loosen the three screws securing the right

side air scoop to the rear heat exchanger.

Rotatetheairscoopoffoftheheatexchanger

tube into the oven cavity.

6. Removethescrewsthatsecuretheperforated

side panel and lift out.

– 10 –

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GAS BURNERS

5. Reverse the procedure to install and check

for proper operation.

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.

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

Shut off the gas before servicing

B. Ensure that the bracket on the back of

the burner is inserted into the slot at the

rear of the burner chamber.

the oven.

1. Remove the lower front cover as outlined

under Covers and Panels.

Note: Check the flame current by following the Flame

Current Measurement procedures under the

Procedures and Adjustments Section of this manual.

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.

3. Remove the bolts securing the gas manifold

and place manifold aside.

4. Grasp the burner and lift out.

– 11 –

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3. Disconnect compression fittings from the

valve.

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.

4. Loosen the bolts securing the valve and

bracket assembly, then remove the screws

securing the valve to the bracket.

3. There are two gas orifices on the manifold.

Remove each orifice and replace with the

correctorificeforthegivenaltitudeasneeded.

4. Reversetheproceduretoinstallmanifoldand

check for proper operation.

GAS SOLENOID VALVE

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

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.

Shut off the gas before servicing

the oven.

1. Remove the control panel and the right side

panel as outlined under Covers and Panels.

6. Verify gas pressure as outlined under the

Gas Pressure Adjustment in Service

Procedures and Adjustments. Check for

properoperation.

2. Disconnect the lead wires.

– 12 –

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IGNITION CONTROL MODULE

SPARK IGNITER AND FLAME SENSE

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

1. Remove the right side cover as outlined

under Covers and Panels.

Shut off the gas before servicing

the oven.

2. Loosen the screws securing the mounting

bracket to the component panel and remove

the bracket.

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.

3. The spark gap is /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

sparkingisoccurring,thenadjustaccordingly.

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.

4. Reversetheproceduretoinstalltheassembly

and check for proper operation.

– 13 –

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5. Remove the screws that secure the motor

mounting plate to the rear wall.

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.

6. Place a piece of cardboard on the bottom of

the oven cavity to protect its surface from

anydamageduringmotorassemblyremoval.

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, thenliftthemotorfromthemounting

plate.

3. Remove screws securing baffle panel and

remove the panel.

10. Position the replacement motor on the motor

mountingplateandinstallmountingboltsand

washers. Hand tighten mounting bolts only.

4. If replacing:

A. Blower Only - Loosen set screws on

blower hub and using a bearing puller,

remove blower from motor shaft.

11. Reconnect to lead wires at the motor, and

replace conduit and junction box cover.

1) Reverse procedure to install and

adjust blower position as outlined

under the Blower Adjustment in

ServiceProceduresandAdjustments

section.

B. Motor - Perform step 4A and continue

procedure.

– 14 –

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OVEN DOORS AND BEARINGS

FRONT VIEW OF MOTOR

FROM INSIDE OVEN CAVITY

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

flushwithendofshaft,thentightensetscrews.

13. Adjust motor position until blower is parallel

to motor mounting plate as outlined in Blower

Adjustment under Service Procedures and

Adjustments.

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.

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.

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.

19. Check oven for proper operation.

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.

– 15 –

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7. The top and bottom bearings are now

accessibleforinspectionand/orreplacement

if needed.

DOOR CATCH ROLLER ASSEMBLY

(INDEPENDENT DOORS)

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.

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

B. If replacing the top bearing, remove the

top bearing retainer and top bearing.

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

1. Removethetopfront cover asoutlinedunder

COVERS AND PANELS.

2. Remove the nuts and bolts that secure the

door catch assembly.

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.

3. Reverse the procedure to install.

4. Adjust the roller catch as outlined under the

DoorCatchAdjustmentinServiceProcedures

and Adjustments.

ROLLER LATCH ASSEMBLY

(INDEPENDENT DOORS)

DOOR WINDOW

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.

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.

OVEN CAVITY

2. Reverse procedure to install.

REMOVE

SCREWS

GLASS

PL-56052

– 16 –

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2. Remove the door handle, then remove the

outer door panel.

DOOR SWITCH

3. Liftouttheinnerdoorpanelwindowassembly.

Disconnect the

4. Remove the door seal from the inside of the

left door only.

electrical power to the machine and

follow lockout / tagout procedures.

5. Remove the screws securing the window

tabs to the door bracket and lift the window

assembly out from the door frame.

1. Remove the top front cover as outlined under

Covers and Panel.

2. Disconnect the lead wires to the door switch.

INNER DOOR PANEL ASSEMBLY

GLASS

REMOVE

SCREWS

3. Remove the switch.

GLASS

4. Reverseproceduretoinstallthereplacement

switch and check for proper adjustment as

outlined in Door Switch under Service

Procedures and Adjustments.

PL-56053

6. Reverseproceduretoinstallthereplacement

window.

– 17 –

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INTERIOR LIGHTS

HIGH LIMIT THERMOSTAT

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

1. Remove the racks from the oven.

1. Remove the top four racks from the oven.

2. Unscrew the glass lens for the light being

replaced, then unscrew the bulb.

2. Remove the high limit thermostat cover/

mounting plate. It is located at the top of the

oven cavity.

LENS

OVEN CAVITY

PL-56054

3. Replace bulb, then reverse the procedure to

install.

3. Disconnect the lead wires from the high limit

thermostat. Removethehighlimitthermostat

from the cover mounting plate.

Lamp Assembly

1. Remove the lens and bulb.

2. Remove the springs from the retaining tabs

(two places) on the socket.

RETAINING TABS

SPRING

PL-56055

CROSS SECTIONAL VIEW

3. Depresstheretainingtabsandpullthesocket

out from the oven, far enough to disconnect

the lead wires.

4. Remove the old RTV silicone from the cover

and mating surfaces inside the oven cavity,

and apply new RTV silicone before installing.

4. Remove the socket from the oven.

5. Reverse procedure to install.

– 18 –

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5. Attach the lead wires to the replacement

socket.

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

airflowdirectionandshouldbepointingtoward

the controls.

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.

• Ensure the fan is seated squarely against the

air tube and the oven bottom.

7. Install the light bulb and lens.

8. Check for proper operation.

• The air deflector should be angled upward at

approximately 30 degrees to properly direct

the airflow.

COOLING FAN

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

1. Removetherightsidepanelasoutlinedunder

Covers and Panels.

2. Disconnect the lead wires to the fan motor by

removing the wire nuts.

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 –

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SERVICE PROCEDURES AND ADJUSTMENTS

Certain procedures in this section require electrical test or measurements while power is

appliedtothemachine. Exerciseextremecautionatalltimes. Iftestpointsarenoteasilyaccessible, discern

power, attach test equipment and reapply power to test.

8. Check for voltage to the switching output.

SOLID STATE TEMPERATURE

CONTROLLER TEST

(SG4D/SG6D)

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.

Test Steps

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. Remove the right side panel as outlined

under Cover and Panels in Removal and

Replacement of Parts.

2. Placeathermocoupleinthegeometriccenter

of the oven cavity. Oven temperature must

be below 450°F.

1) If input voltage is correct, proceed to

step 9. If input voltage is not present,

the problem is not in the controller

(SeeTroubleshooting).

3. Set the temperature control to the maximum

setting.

2) If output voltage is correct, proceed

to step 9. If output voltage is not

correct, check temperature probe,

asoutlinedunderTemperatureProbe

Test (SG4D/SG6D).

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.

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.

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

ON.

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.

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, temperature control is

functioning properly.

a. If correct, proceed to step 8.

b. If incorrect, the problem is not in the

temperature

control

(see

Troubleshooting).

– 20 –

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7. Calculate the average oven temperature by

adding the actual minimum temperature to

theactualmaximumtemperatureanddividing

by 2.

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

checkforcalibrationasoutlinedunder

Solid State Temperature Controller

Calibration (SG4D/SG6D).

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(thecontrolis9°Foutofcalibration)

340 - 334 = 6°F Control Differential

347-335=12°FOvenTemperatureDifferential

SOLID STATE TEMPERATURE

CONTROL CALIBRATION

(SG4D/SG6D)

A. If the average oven temperature is within

+/-5°Ffromthedialsetting, nocalibration

is necessary.

Before attempting any calibration, see Section 8C of

SOLID STATE TEMPERATURE CONTROLLER

TEST (SG4D/SG6D) on previous page.

B. If the average oven temperature is not

within +/- 5°F, calibration is

recommended.

Calibration Steps

8. Loosen the set screw on the temperature

controllerandcarefullyremovetheknobfrom

the shaft, without rotating the shaft. This will

expose the calibration adjustment control

access hole in the front panel.

1. Placeathermocoupleinthegeometriccenter

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).

9. Monitor the internal oven temperature and

determine at what temperature the control

shouldcutontogiveyoutherequiredminimum

temperature (Example: 350-341=9;

334+9=341.341°Fisthetemperatureatwhich

you would wish the controller to cut on).

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.

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.

6. The nominal control differential should be

less than 20°F.

A. If the control differential is less than

20°F, the temperature control circuit is

functioning properly. Proceed to step 7.

11. The calibration control is adjusted clockwise

in order to increase the set temperature and

counter clockwise to decrease the set

temperature.

B. If the control differential is more than

20°F, check the temperature probe as

outlined under Temperature Probe Test

(SG4D/SG6D).

12. Thecontrollerhasonly+/-25°Fofadjustment.

turnofthecalibrationadjustmentrepresents

approximately 20°F shift in calibration.

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

temperaturecontrollerandrun calibration

steps again.

– 21 –

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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. Ifthemeasuredresistancevaluesareinsidethegiventolerance, thentheprobeisfunctioningproperly.

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.

TEMP (°F)

OHMS*

90,000

4,077

3,016

2,266

1,726

1,332

1,041

822

240

260

280

300

320

340

360

380

656

400

529

425

424

450

334

475

266

(*) Resistance in ohms 10%

– 22 –

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3. Listed are the parameters and data in the

setup mode.

COMPUTER CONTROLLER

(SG4C/SG6C)

ALTERNATING ON DISPLAY

Operation

Refer to the Installation & Operation Manual for

specific operating instructions.

PARAMETER

DATA

Celsius_Fahrenheit

Guard Band

C_F

Setup Mode

4000

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).

Temperature

Compenstaion

tcnP

OFF

Input Type 1

Range Low 1

Range High 1

Hysteresis

InP1

rL1

500

CAUTION: Changing the C_F, InP1, rL1 and rH1

parameters will default all menus.

rH1

1. Use this key sequence to access the setup

mode: UP arrow, Rack 1, Temperature,

Temperature, DOWN arrow, Rack 1.

HYS1

CAL1

Calibration Offset

Exit setup mode

and return to

operation mode.

Set point temperature is

displayed or if calling for heat,

dashes (----) are displayed.

PL-56075

2. Once in the setup mode the display will

alternate between the parameter and

programmeddata.

Probe Test

A. To change data to the factory setting,

use the arrow keys.

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.

B. To select the next parameter, press the

Rack 1 key.

1. Temporarilydisconnecttheexistingleadwires

from the computer control and connect them

to a good J-type thermocouple.

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.

2. Turn the power switch to ON and set the

temperature controller to 350°F.

D. If there are no key activations after 1

minute, thecontrolwillreturntooperation

mode.

A. If the oven reaches the set temperature

and cycles with the temporary

thermocouple, then the existing probe is

malfunctioning.

3. Replacethetemperatureprobewiththecorrect

part and check for proper operation.

– 23 –

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Solid State Relay Test

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

then exit the temperature set mode.

1. Remove the right side panels as outlined

under Covers and Panels in Removal and

Replacement of Parts.

4. Allow the oven temperature to stabilize

(normally three cycles).

2. Turn the power switch to the ON position.

5. Compare the controls set point temperature

to the thermocouple meter reading when the

heat light goes out.

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. A temperature variance more than 5°F

indicates an adjustment is needed.

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

1) To make the adjustment, proceed to

step 6.

B. If no voltage is present, computer control

is not functioning properly.

2) If temperature variances is less than

5°F, then the computer control is

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.

6. Enter the setup mode as outline in Setup

ModeunderComputerControl(SG4C/SG6C).

1) ReplacetheSSRandcheckforproper

operation.

A. Advance through the menu until CAL1

(calibration offset) appears.

B. If 120 VAC is present, component is

functioning properly.

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.

5. Reassemble oven and check for proper

operation.

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.

COMPUTER CONTROL CALIBRATION

(SG4C/SG6C)

Calibration Steps

1. Placeathermocoupleinthegeometriccenter

of the oven cavity.

3) Exit the setup mode.

7. Allow the oven to cycle at least two times

between adjustments.

2. SettheON-OFF-COOLDOWNswitchtoON.

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

proceed to step 4.

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.

B. If the set point temperature is other than

350°F, proceed to step 3 to change the

temperature.

1) Adjust the calibration offset value as

outlined in step 6, until the cycling

temperature is within tolerance.

3. Press the set key then temperature key to

enter the temperature set mode.

B. If the above adjustment cannot be

obtained, replace the computer control

and check for proper operation.

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.

– 24 –

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4. Install hose barb adapter and attach

manometer tube.

GAS PRESSURE ADJUSTMENT

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.

5. Remove adjustment screw cap from the gas

valve and turn gas supply to the oven back

on.

Thefollowingstepsrequirepower

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).

PRESSURE READINGS (IN W.C.)

GAS

TYPE

LINE

MANIFOLD

RECOMMENDED

MIN

5.0

MAX

Natural

3.5

7.0

Propane

11.0

– 25 –

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Thefollowingstepsrequirepower

to be applied to the unit during the test. Use

extreme caution at all times.

VERIFICATION OF SPARK AT IGNITOR

Disconnect the

electrical power to the machine and

follow lockout / tagout procedures.

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.

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.

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.

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:

Do not hold the wire with your

hands for this test. The manual gas valve must be

closed.

A. The switch actuator is engaged by the

switchleverwhentherightdoorisbetween

1" and 1 ¹/2" from being closed.

3. Clamp the ignition cable in a manner that will

3. If adjustment is necessary, bend the switch

actuator to obtain the proper setting.

position the end of the cable /16" from the

oven frame (bare metal surface). It is critical

that the cable be held /16" away from the

surface of the oven frame or sparking may

not occur even though the sparking circuit is

functioning properly.

4. Install the top front cover.

5. Apply power to the oven and check for proper

operation.

– 26 –

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BLOWER ADJUSTMENT

FLAME CURRENT MEASUREMENT

Disconnect the

MICROAMP METER

electrical power to the machine and

follow lockout / tagout procedures.

1. Remove the blower motor and mounting

assembly as outlined under Blower and

MotorinRemovalandReplacementofParts.

FENWAL

DUAL

CHANNEL

345519-4

424471-G1

IGNITION

MODULE

C-2

24V

LEFT

RIGHT

FC2-

GND

BURNER

FC2+

FC1-

SPARK

OUT

SPARK

OUT

FC1+

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.

120 VOLT UNITS PROVIDED

WITH PRONG GROUNDED

PLUG.

GND.

WHITE

GREEN

BLACK

417856-1

CONNECT 200-240 VOLT

SUPPLY TO L1 L2

A. If the blower is square, then tighten

motor mounting bolts and proceed to

step 4.

1. UseaMicroampere(µamp)metertomeasure

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.

B. If the blower is not square, continue

adjustinguntilproperspacingisachieved

then tighten motor mounting bolts. If

necessary, place shims between motor

and frame.

3. The ignition system is 1 µamp sensitive.

4. You should be able to attain a reading of 4

µamps when connected as shown.

1/4 INCH AT

5. The meter is to be placed in series with the

flame sense wires S1 & S2.

PLACE SHIMS UNDER REAR OF

ALL PLACES

MOTOR TO WIDEN TOP SPACE.

TOP

FLAT

6. Connect at the board or the igniter end,

whichever is more convenient.

WASHER

MOTOR

BLOWER

FRAME

FLAT WASHER

PLACE SHIMS HERE

WHEN NEEDED.

NUT/STAR

WASHER

BOTTOM

PLACE SHIMS UNDER FRONT OF

MOTOR TO WIDEN BOTTOM SPACE.

MOTOR MOUNTING PLATE

PL-56058

4. Reverse the procedure to install. Use

locktight on mounting nuts and bolts.

– 27 –

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DOOR ADJUSTMENT

DOOR STRIKE ADJUSTMENT

(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.

1. Check the doors to make sure they have an

equal gap between them and that the vertical

edgeofthedoorisparalleltotheverticaldoor

seal. If the doors are not positioned in this

manner, adjust the doors as described.

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. Openthedoorsandinspectthedoorstrikefor

proper shape.

EQUAL GAP

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

B. If adjustment is necessary, loosen

fasteners, closedoorsandinsurecontact

betweenthedoorinnersurfaceandupper

horizontal seal. Slide door strike plate

until contact with roll latch is made.

Tighten strike plate fasteners.

EQUAL GAP

PL-56059-1

2. Remove the top front cover.

3. Loosenthescrewsthatsecuretheupperdoor

bearingsandrelatedhardware,justenoughto

allow door movement.

UPPER

BEARING

LOOSEN

SCREWS

DOOR

SHAFT

3. Openandclosethedoorsseveraltimeswhile

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.

PL-56060

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.

4. Move the door until proper alignment is

achieved, then tighten the screws on the

upperdoorbearinghardware.

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

necessary.

6. If one door is higher than the other, add or

remove shims under hinge pin as needed.

– 28 –

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6. Place a standard flat screwdriver through the

opening in the top channel into the slot in the

cylinder of the catch assembly.

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. Inspectthedoorcatchassembly, andreplace

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

ovenasoutlinedunder DoorAdjustment.

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 –

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ELECTRICAL OPERATION

No Ignition Light (SG4C/SG6C) - Lit when power is

COMPONENT DESCRIPTION

turnedON, duringignitiontrialandgaspurgetimeand

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.

Master Switch (S1) - Determines the mode of

operation; ON, OFF or OVEN COOL

TemperatureProbe(SG4D/SG6D)-Thistemperature

probeisathermistordevice.Athermistorisacalibrated

resistor which changes resistance with the

temperature. As the temperature increases, the

resistanceofthethermistordecreases.Theresistance

of the probe is compared to the resistance of the

temperature controller resistor in to control and

maintain temperature.

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

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

motorspeedbetweenHIandLOWsettings. 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.

TemperatureProbe(SG4C/SG6C)-Thistemperature

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.

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.

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.

Transformer (T1) - Provides 24 VAC power to the

ignition control module and heating circuit.

Gas Valve (Dual Solenoid) - Contains two valves.

The first valve is opened when the unit is turned on

andthelimittemperatureisnotexceeded. Thesecond

valve is turned by the heating system. Both valves

must be open in order to get gas to the main burners.

Motor Control Relay(s) (SG4C/SG6C) - Provides

powertoHIandLOWspeedmotorwindingsbasedon

operatorrequirements.

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.

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.

Ignition Control Module- Provide ignition spark and

monitors burner(s) flame current during ignition

sequence.

Cooling Fan - Circulates cooler air from rear of oven

forward to cool components in the control area.

IgnitionElectrodeandFlameSenseDevice-Ignites

the gas and senses the presence of a flame. The

flame presence generates a micro-amp flame sense

currentthatismonitoredbytheignitioncontrolmodule.

A flame sense current of 1 micro amp (minimum and

stable) is required to maintain burner ignition.

Computer Control (SG4C/SG6C) - Monitors

temperature sensor and regulates the oven cavity

temperaturebycontrollingtheheatrelay(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 On Light (SG4D/SG6D) - Lit whenever the

Master Switch (S1) is turned to ON or OVEN COOL

mode.

Power Level Control - Selects the percent of heat

input between 22% and 100%. Power level must be

on for oven to work.

Heat Light - Lit whenever temperature controller is

calling for heat.

– 30 –

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Plug, Socket and Components (SG4D/SG6D)

CONTROL PANEL

(REAR VIEW)

COMPONENT PANEL

(FRONT VIEW)

PORCELAIN

BLOCK

ON/OFF/

COOLDOWN

SWITCH

ASSEMBLY

1 4

2 5

3 6

TRANSFORMER

OUT

1LT

2LT

HEAT

INDICATOR

LIGHTS

3 LT

NO IGNITION

5 COM

3 NO

2 (COM AC)

4 (120VAC)

9 (240VAC)

SOLID STATE

THERMOSTAT

IGNITION

CONTROL

MODULE

POWER

CONTROL

HEAT

RELAY

(R3)

PORCELAIN

BLOCK

COOK TIMER

ASSEMBLY

FAN SWITCH

1 4

2 5

1 4

2 5

LIGHT SWITCH

3 6

BUZZER

12 11

10 11

1P (FEMALE)

(PLUGS VIEWED FROM PIN SIDE)

PL-56081-1

– 31 –

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Plug, Socket and Components (SG4C/SG6C)

CONTROL PANEL

(REAR VIEW)

COMPONENT PANEL

(FRONT VIEW)

PORCELAIN

BLOCK

ASSEMBLY

2J (FEMALE)

TRANSFORMER

OUT

SOLID STATE

RELAY (SSR1)

3J (FEMALE)

LOAD

OPER.TEMP.

PIN NUMBERS

0-30 DEG. C

EVENT

EVENT COM (IN)

EVENT

NOT USED

POWER 5V

EVENT

OUT

SOLID STATE

RELAY (SSR2)

(IN)

OUT

NOT USED

SSRI

NOT USED

L1 24V-

7 NOT USED

8 NOT USED

9 L2 24V-

10 NOT USED

11 NOT USED

12 NOT USED

INPUT

LOAD

(IN)

COMPUTER

CONTROLLER

INPUT

IGNITION

CONTROL

MODULE

HEAT

RELAY

(R1)

NOT USED

TC J TYPE (RED)

NOT LISTED

PORCELAIN

BLOCK

ASSEMBLY

1LT

NO IGNITION

LIGHT

SWITCH

ON/OFF/

COOLDOWN

SWITCH

GROUND

ELECTRONIC

BEEPER

1J (FEMALE)

22 21

24 23

20 19

16 15

12 11

1P (MALE)

23 24

21 22

17 18

13 14

18 17

14 13

2P (MALE)

3P (MALE)

19 20

15 16

11 12

(PLUGS VIEWED FROM

PIN SIDE)

PL-56082

(PLUGS VIEWED FROM PIN SIDE)

– 32 –

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2. Set temperature controller dial to desired

temperature.

SEQUENCE OF OPERATIONS

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.

SG4D/SG6D with Solid State Temperature

Controller

Schematic 424373-1 will be used to explain the

electrical sequence of operation.

Cook Cycle

1. Conditions

C. Power to timer terminal C.

A. Oven connected to correct voltage.

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

D. Transformer (T1) energized.

1) Power (24 VAC) to one side of the

followingcomponents:heatrelay(R3)

normally open (N.O.) contact.

2) L2 (neutral or second line) to one

side of the following components: L1

of the power level control, power ON

light,heatlight,temperaturecontroller

boardterminal9(120VAC)orterminal

10(208-240VAC), ovencavitylights,

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.

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. Convectionfanmotorisenergizedthrough

(S3) high-low.

B. Oven properly grounded.

C. Gas supply valve ON.

1) When the convection fan motor

reaches operating speed, the

centrifugalswitch(N.O.)onthemotor

closes.

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

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

has no affect on the function of the

normal cooking cycle).

H. Heat relay is energized.

1) N.O. contacts close.

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%.

(Continued next page)

– 33 –

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4. Heating circuit is powered.

Timer Cycle

A. No ignition light (red) comes ON.

The timer operates independently of the heating

cycle. Additional time can be set or the timer can be

turned OFF throughout the cooking cycle.

B. Module performs a self diagnostic test

for 4 seconds.

1. With the master switch turned ON, power is

supplied to timer.

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

energized. Gas starts to flow to burners.

A. Set the timer to desired time.

D. Sparking begins, the no ignition light

goes out and burners light.

B. Contacts 1 & 3 close, timer motor is

energized and timing down begins.

NOTE:Sparkingcontinuesforupto7secondsoruntil

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.

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.

5. Oven reaches set temperature.

Cool Down Cycle (Solid State Temperature

Controller)

A. Temperature controller de-energizes

internalrelayandthenormallyopen(N.O.)

contacts open.

1. Conditions.

A. Oven is ON.

1) Heat light goes out.

B. Oven cavity temperature needs to be

lowered.

B. Power removed from heat relay.

C. Heatrelaynormallyopen(N.O.)contacts

OPEN.

C. Doors are open.

1) Convection fan de-energized.

2) Thermostatde-energized.

a. Heat light out.

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.

b. Power removed from heat relay.

3) 24 V transformer de-energized.

4) Cooling fan de-energized.

– 34 –

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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.

Schematic 426575-1 will be used to explain the

electrical sequence of operation.

3. If door is closed, power is supplied to one

side of the following components:

Normal Cook Cycle

1. Conditions

A. Power ON light (Amber) comes ON.

B. Transformer (T1) energized.

A. Oven connected to correct voltage.

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

1) Power (24 VAC) to one side of the

followingcomponents:heatrelay(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.

2) L2(neutralorsecondline)tooneside

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.

a. First valve (safety) on the gas

valve energized. Gas does not

flowtotheburneruntilthesecond

valve (main) is energized.

1) Ground (GND) to one side of the

following components: computer

control case, no ignition light,

transformer secondary (T2), ignition

controlmodule,thefirstvalve(safety)

and second valve (main) on the dual

solenoid gas valve and computer

control pin 9 (C3-9).

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.

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. Powerisavailabletotheovenlightswitch

(S2).

– 35 –

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C. Power to terminal 1 on solid state relay 1

SSR1-load side and solid state relay 2

SSR2-load side.

B. Heat relay coil (R1) energized.

1) (R1) contacts (N.O.) close and the

heating circuit is powered.

D. Component cooling fan energized.

2) Oven heat light on the control comes

on.

E. Transformer (T1) is energized, 24 volt

output.

C. Ignition module is energized.

1) Heating circuit is powered.

2) No ignition light (red) comes ON.

1) Power (24 VAC) to one side of the

followingcomponents:heatrelay(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.

3) Module performs a self-diagnostic

test for 4 seconds.

4) Secondvalve(main)onthegasvalve

is energized. Gas starts to flow to

burners.

2) First valve (safety) on the gas valve

energized. Gas does not flow to the

burner until the second valve (main)

is energized.

5) Sparking begins, the no ignition light

goes out and burners light.

3) Ignition module energized.

NOTE:Sparkingcontinuesforupto7secondsoruntil

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.

4) Power(24VAC)totheovencomputer

control.

3. Controlisenergizedandperformsapoweron

self test before energizing outputs. If the

control passes self test, then the outputs are

energizedandoperationsequencecontinues,

If control does not pass self test, then the

corresponding error code is displayed.

NOTE: Control retains last temperature set.

4. Oven reaches set point temperature.

A. Computer control senses oven cavity

temperature.

A. Computer control deactivates the

120 VAC output to heat relay (R1).

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.

1) Heatrelay(R1)de-energizedandthe

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.

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.

– 36 –

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2) Oven heat LED on the control goes out.

B. The computer control 5 VDC output from

pinsC2-1(-)andC2-8(+)isactivatedand

SSR2 relay is energized.

3) Oven ready LED on the control comes

ON.

1) Power (120 VAC) is applied to the

convection fan motor low speed

terminal.

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.

3. At the end of the cook time, the electronic

beeper sounds momentarily to indicate the

end of the first stage cooking (oven operates

normallyatthetemperatureandtimeselected

until time expires).

Temperature and Time Cycle (Normal Cooking)

4. The display flashes HOLD as the oven enters

theholdmode.Thisisalsoconsideredsecond

stagecooking(ovenheatingstopsbutproduct

continues to cook on residual heat).

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.

A. Convection fan motor is de-energized.

Refer to the Installation & Operation Manual for

specific operation instructions of the oven computer

control.

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.

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.

5. Aftertheoventemperaturedropsbelow150°F,

theheatcomesbackonandcyclesasneeded

to maintain the hold temperature of 150°F.

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.

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.

Roast and Hold Cycle

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

COOL DOWN position.

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.

– 37 –

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WIRING DIAGRAMS

– 38 –

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– 39 –

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SCHEMATICS

BLACK

WHITE

120 VOLT

200-240V

C1-6

GND.

POWER ON

POWER SWITCH

ON/OFF/COOL

SHOWN ON

HEATING

POWER LEVEL

THERMOSTAT

40W

PROBE

OVEN LAMP

40W

C1-10

OVEN LAMP SWITCH

OPEN

C1-3

C3-1

OVEN LAMP

DOOR

SWITCH

C1-4

C3-2

1 HOUR TIMER

HOLD

BUZZER

WHT. LEAD

HIGH

C1-11

C1-12

FAN SPEED

SWITCH

HEAT RELAY

COM.

CONVECTION

FAN MOTOR

2-SPEED

LOW

ROTATION

FROM FRONT

BLACK

WHITE

BLUE

RED

BLACK

YELLOW

24V.

YELLOW

GND.

24V.

GND.

DUAL

YELLOW

24V.

YELLOW

HEAT

CHANNEL

IGNITION

MODULE

FOR 240V.

USE BLUE FOR BLACK

USE BLACK FOR WHITE

RELAY

NO IGNITION

LIMIT

550 F

C1-8

2ed VALVE

C2-2

C2-1

C2-3

1st VALVE

COOLING FAN

424373-1

GAS CONVECTION OVEN SG4 WITH STD. CONTROL

REV D

– 40 –

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GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL

426575-1 REV. C

– 41 –

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TROUBLESHOOTING

POSSIBLE CAUSES

SYMPTOMS

Line voltage.

Blower motor doesn't run in OVEN COOL or

ON position.

Power/Master switch malfunction.

Fan switch malfunction.

Interconnection wiring malfunction.

Door switch malfunction.

Power/Master switch contacts inoperative.

Interconnecting wiring malfunction.

Blower motor doesn't run in the ON position.

Cool Down functions OK.

Blower motor doesn't run in OVEN COOL

position. Runs OK in ON position.

Power/Master switch malfunction.

Interconnection wiring malfunction.

Shorted electrode on igniter/flame sense.

Igniter cable (high voltage) OPEN.

Heat relay malfunction.

Centrifugal switch in blower motor inoperative.

Transformer inoperative.

Gas does not ignite.

No spark.

No Ignition light is not ON.

High limit thermostat open.

Interconnecting wiring malfunction.

Ignition module malfunction.

Gas solenoid valve off or inoperative.

Manual gas valve closed.

Sparks but gas does not ignite.

Gas ignites but will not maintain flame.

Excessive or low heat.

Gas supply OFF or insufficient gas pressure.

Inerconnecting wiring malfunction.

Igniton module malfunction.

Igniter lead connections malfunction.

Igniter ground inoperative.

Igniter/flame sense malfunction or maladjusted.

Insufficient gas pressure.

Snorkel vent plugged, obstructed or missing.

Incorrect polarity from transformer to ignition module.

Temperature probe malfunction.

Temperature control board malfunction.

Gas pressure insufficient.

Gas orifice plugged or obstructed.

Power level may be set to low.

– 42 –

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TROUBLESHOOTING

SYMPTOMS

POSSIBLE CAUSES

Interconnecting wiring malfunction.

Line voltage incorrect.

Timer malfunction.

Mechanical timer inoperative or not functioning

properly.

Motor inoperable.

Interconnecting wiring malfunction.

Component cooling fan does not run.

Convection fan motor speed/direction.

Poor combustion.

Gas pressure incorrect.

Uneven cooking.

Exhaust vent plugged or obstructed.

Snorkel vent plugged or obstructed.

Air flow baffles missing or damaged.

High ambient temperatures

Wiring connections loose.

Cooling fan malfunction.

Intermittent problems.

Power/Master switch in OVEN COOL position.

Door or door switch open.

No power to temperature controller.

No heat; LED on the controller is flashing.

Probe open or shorted.

COMPUTER CONTROL MODELS ONLY

SYMPTOM

POSSIBLE CAUSES

High limit switch open.

Probe malfunction.

Control malfunction.

Oven does not heat.

Power level control set to off.

Probe malfunction.

Control malfunction.

High limit thermostat shutting off gas burner.

Oven not hot enough.

Probe malfunction.

Control range high (rH1) setting to low. See Setup

Mode under Computer Controller (SG4C/SG6C).

– 43 –

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ERROR CODES

CODE AND

PROBLEM

PROBABLE CAUSE

Internal ROM malfunction

Internal RAM malfunction

SOLUTION

Er01 - ROM check

sum error

Cycle power.

Er02 - RAM check

sum error

Er03 - Ambient sensor

error

Ambient temperature is below 32°F Check ambient temperature at the control.

Er04 - Configuration

error

Microprocessor malfunction

Power loss while storing data

Cycle Power.

Ero5 - EEprom error

· Check the InP1 setup parameter. Verify that

it matches the sensor.

· Check sensor and connections for a

reversed or open sensor. If the condition

causing the error is resolved, the error will

clear.

· Incorrect sensor type

· Measuring temperature outside

the sensor range

Er06 - Zone 1 A/D

under flow error

· Check the InP1 setup parameter. Verify that

it matches the sensor.

Er07 - Zone 1 A/D

overflow error

· Check sensor and connections for a

reversed or open sensor. If the condition

causing the error is resolved, the error will

clear.

Open sensor

· Cycle Power.

· Check sensor and connections for a

reversed or open sensor.

Er10 - Stack overflow

error

Microprocessor malfunction

Open sensor

· Check the InP1 setup parameter. Verify that

it matches the sensor.

· Check sensor and connections for a

reversed or open sensor.

Er11 - Open sensor

error

· Check the InP1 setup parameter. Verify that

it matches the sensor.

· Check sensor and connections for a

reversed or open sensor.

· Incorrect sensor type

· Measuring temperature outside

the sensor range

Er12 - Shorted sensor

– 44 –

FORM 35626 Rev. A (02-08)

PRINTED IN U.S.A.

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