Page 3 - TABLE OF CONTENTS
– 3 – TABLE OF CONTENTS GENERAL .............................................................................................................................................................. 5 Introduction .................................................................................................
Page 5 - Motor bearings are sealed and prelubricated.; Electrical Data; GENERAL; Gas Data; • VOM with AC current tester (any quality VOM; Special; • Manometer
– 5 – INSTALLATION Generally, installations are made by the dealer orcontracted by the dealer or owner. Detailed installationinstructions are included in the Installation & OperationManual which is sent with each unit. OPERATION Detailed operation instructions are included with eachoven. CLEANIN...
Page 6 - REMOVAL AND REPLACEMENT OF PARTS; COMPONENT LOCATION; TOP VIEW
– 6 – REMOVAL AND REPLACEMENT OF PARTS COMPONENT LOCATION DOOR SWITCH IGNITER & FLAME SENSE GAS BURNERS COMPONENT PANEL COOLING FAN OVEN LIGHTS CONTROL PANEL TOP VIEW BLOWER MOTOR TEMPERATURE PROBE HIGH LIMIT GAS VALVE PL-56044
Page 7 - COVERS AND PANELS; D i s c o n n e c t t h e; TOP FRONT COVER; SG4D SHOWN
– 7 – COVERS AND PANELS D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. Top Front Cover 1. The top front cover is secured with four screws, two on each side of cover. Removethese screws, then remove the cover fromthe oven. 2. Reverse the procedure to ...
Page 8 - CONTROL PANEL COMPONENTS; Procedure; Remove the control panel as outlined under Covers and Panels.
– 8 – CONTROL PANEL COMPONENTS 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 o...
Page 9 - COMPONENT PANEL COMPONENTS
– 9 – COMPONENT PANEL COMPONENTS 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 pro...
Page 10 - TEMPERATURE PROBE
– 10 – TEMPERATURE PROBE D i s c o n n e c t t h e electrical power to the machine andfollow 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 orthe computer controll...
Page 11 - GAS BURNERS
– 11 – GAS BURNERS D i s c o n n e c t t h e electrical power to the machine andfollow 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 t...
Page 12 - GAS ORIFICE; GAS SOLENOID VALVE
– 12 – GAS ORIFICE D i s c o n n e c t t h e electrical power to the machine andfollow 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....
Page 13 - IGNITION CONTROL MODULE; SPARK IGNITER AND FLAME SENSE
– 13 – IGNITION CONTROL MODULE D i s c o n n e c t t h e 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 removethe bracket. 3. Dis...
Page 14 - BLOWER AND MOTOR
– 14 – BLOWER AND MOTOR D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. 1. Remove racks. 2. Remove the screws securing the snorkel and remove the snorkel. 3. Remove screws securing baffle panel and remove the panel. 4. If replacing: A. Blower Only - L...
Page 15 - OVEN DOORS AND BEARINGS; MOTOR ROTATES CLOCKWISE
– 15 – 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 BlowerAdjustment under Service Procedures andAdjustments. 14. Position motor mounting plate on the rear wal...
Page 16 - ROLLER LATCH ASSEMBLY; DOOR WINDOW; DOOR CATCH ROLLER ASSEMBLY
– 16 – 7. The top and bottom bearings are now accessible for inspection and/or replacementif needed. 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 lo...
Page 17 - DOOR SWITCH; REMOVE; INNER DOOR PANEL ASSEMBLY
– 17 – DOOR SWITCH D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. 1. Remove the top front cover as outlined under Covers and Panel. 2. Disconnect the lead wires to the door switch. GLASS GLASS REMOVE SCREWS INNER DOOR PANEL ASSEMBLY PL-56053 2. Remov...
Page 18 - Lamp Assembly; RETAINING TABS; CROSS SECTIONAL VIEW; INTERIOR LIGHTS; HIGH LIMIT THERMOSTAT
– 18 – Lamp Assembly 1. Remove the lens and bulb. 2. Remove the springs from the retaining tabs (two places) on the socket. 3. Depress the retaining tabs and pull the socket out from the oven, far enough to disconnectthe lead wires. 4. Remove the socket from the oven. RETAINING TABS SPRING CROSS SEC...
Page 19 - COOLING FAN
– 19 – COOLING FAN D i s c o n n e c t t h e electrical power to the machine andfollow 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. 3. Remove the screws securing the air defle...
Page 20 - Test Steps; SERVICE PROCEDURES AND ADJUSTMENTS
– 20 – SOLID STATE TEMPERATURE CONTROLLER TEST (SG4D/SG6D) Test Steps 1. Remove the right side panel as outlined under Cover and Panels in Removal andReplacement of Parts. 2. Place a thermocouple in the geometric center of the oven cavity. Oven temperature mustbe below 450°F. 3. Set the temperature ...
Page 21 - Calibration Steps
– 21 – SOLID STATE TEMPERATURE CONTROL CALIBRATION (SG4D/SG6D) Before attempting any calibration, see Section 8C ofSOLID STATE TEMPERATURE CONTROLLERTEST (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 sw...
Page 23 - COMPUTER CONTROLLER; Operation; il
– 23 – COMPUTER CONTROLLER (SG4C/SG6C) Operation Refer to the Installation & Operation Manual forspecific operating instructions. Setup Mode Use the setup mode to verify that the control isconfigured to the factory settings which result in theproper operation of the oven. If the CAL1 parameteris...
Page 24 - Solid State Relay Test; COMPUTER CONTROL CALIBRATION
– 24 – Solid State Relay Test 1. Remove the right side panels as outlined under Covers and Panels in Removal andReplacement of Parts. 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 hol...
Page 25 - GAS PRESSURE ADJUSTMENT
– 25 – GAS PRESSURE ADJUSTMENT D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. Accurate gas pressure adjustments can only bemade with the gas on and the burner lit. If theincoming line pressure to the valve is less than theminimum stated, then the man...
Page 26 - VERIFICATION OF SPARK AT IGNITOR; DOOR SWITCH ADJUSTMENT; Disconnect the electrical power
– 26 – VERIFICATION OF SPARK AT IGNITOR D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. Shut off the gas before servicing the oven. 1. Remove the bottom front cover as outlined under Covers and Panels in Removal andReplacement of Parts. 2. Disconnect ...
Page 27 - BLOWER ADJUSTMENT; GND
– 27 – D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. 1. Remove the blower motor and mounting assembly as outlined under Blower andMotor in Removal and Replacement of Parts. 2. Loosen the motor mounting bolts. 3. Adjust the motor position until the b...
Page 28 - DOOR ADJUSTMENT
– 28 – D i s c o n n e c t t h e electrical power to the machine andfollow lockout / tagout procedures. 1. Check the doors to make sure they have an equal gap between them and that the verticaledge of the door is parallel to the vertical doorseal. If the doors are not positioned in thismanner, adjus...
Page 29 - DOOR CATCH ROLLER ADJUSTMENT
– 29 – 6. Place a standard flat screwdriver through the opening in the top channel into the slot in thecylinder of the catch assembly. 7. Turn the screwdriver clockwise to increase the ball pressure or counterclockwise todecrease the pressure onto the door strike.The ball pressure should be tight en...
Page 30 - ELECTRICAL OPERATION; S o l i d S t a t e T e m p e r a t u r e C o n t r o l l e r; COMPONENT DESCRIPTION; High Limit Thermostat -
– 30 – ELECTRICAL OPERATION 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. Availableon models SG4D/SG6D. Alarm/Buzzer - Signals t...
Page 32 - CONTROL PANEL
– 32 – Plug, Socket and Components (SG4C/SG6C) 2 3 1 5 6 4 8 9 1 2 NO IGNITION 2J (FEMALE) 2J 3J 3J (FEMALE) PIN NUMBERS CONTROL PANEL (REAR VIEW) COMPONENT PANEL (FRONT VIEW) 1LT 4 1 5 2 6 1 10 7 22 21 24 23 18 17 20 19 14 13 16 15 10 9 12 11 6 5 8 7 2 1 4 3 11 8 12 9 7 1 2 3 4 5 6 7 8 9 10 7 4 11 ...
Page 33 - NOTE; SEQUENCE OF OPERATIONS; Cook Cycle
– 33 – 2. Set temperature controller dial to desired temperature. 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) energ...
Page 34 - Timer Cycle
– 34 – 4. Heating circuit is powered. 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: Sparkin...
Page 38 - WIRING DIAGRAMS
Page 39 - OL
– 39 – WIRING DIA GRAM 734 COMPUTER CONTR OL DU AL B URNER CONVECTION O VENS 120 & 200 V . 426574 Re v. C
Page 40 - SCHEMATICS; HEATING; REV D; GAS CONVECTION OVEN SG4 WITH STD. CONTROL
– 40 – SCHEMATICS POWER LEVEL C1-3 C1-4 C3-1 C3-2 OPEN DOOR SWITCH PROBE C1-6 NO IGNITION HEAT RELAY C M BK NC HOLD BUZZER WHT. LEAD 1 HOUR TIMER NO FROM FRONT ROTATION HEATING THERMOSTAT POWER ON SHOWN ON ON/OFF/COOL C2-3 C2-1 C2-2 1st VALVE TH GND. 24V. CHANNEL DUAL RED YELLOW BLUE YELLOW 24V. T2 ...
Page 41 - GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL
– 41 – GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL 426575-1 REV. C
Page 42 - TROUBLESHOOTING
– 42 – TROUBLESHOOTING S M O T P M Y S S E S U A C E L B I S S O P r o L O O C N E V O n i n u r t ' n s e o d r o t o m r e w o l B . n o i t i s o p N O . e g a t l o v e n i L . n o i t c n u f l a m h c t i w s r e t s a M / r e w o P . n o i t c n u f l a m h c t i w s n a F . n o i t c n u f l...
Page 43 - COMPUTER CONTROL MODELS ONLY
– 43 – TROUBLESHOOTING COMPUTER CONTROL MODELS ONLY M O T P M Y S S E S U A C E L B I S S O P . t a e h t o n s e o d n e v O . n e p o h c t i w s t i m il h g i H . n o i t c n u f l a m e b o r P . n o i t c n u f l a m l o r t n o C . f f o o t t e s l o r t n o c l e v e l r e w o P . r e n r u...
Page 44 - ERROR CODES; li
– 44 – FORM 35626 Rev. A (02-08) PRINTED IN U.S.A. ERROR CODES D N A E D O C M E L B O R P E S U A C E L B A B O R P N O I T U L O S k c e h c M O R - 1 0 r E r o r r e m u s n o i t c n u f l a m M O R l a n r e t n I . r e w o p e l c y C k c e h c M A R - 2 0 r E r o r r e m u s n o i t c n u f l...
