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SERVICE MANUAL
SG4 & SG6 SERIES
FULL SIZE GAS
CONVECTION OVENS
MODELS
SG4D ML-114875
SG4C ML-114876
SG6D ML-114877
SG6C 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
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© VULCAN-HART, 2008 – 2 –
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TABLE OF CONTENTS GENERAL .............................................................................................................................................................. 5 Introduction ............................................................................................................................................... 5 Installation .............................................................................................................................................
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TABLE OF CONTENTS (Cont.) Computer Controller (SG4C/SG6C) .........................................................................................................23 Operation ...........................................................................................................................................23 Setup Mode .......................................................................................................................................23 Probe Test ......................
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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 1 unless the picture or illustration needs to be model specific. All models are equipped with a two-speed /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-mi
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REMOVAL AND REPLACEMENT OF PARTS COMPONENT LOCATION TOP VIEW BLOWER MOTOR OVEN LIGHTS COOLING FAN TEMPERATURE PROBE COMPONENT GAS BURNERS PANEL IGNITER & GAS VALVE FLAME SENSE DOOR CONTROL SWITCH PANEL HIGH LIMIT PL-56044 – 6 –
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Control Panel COVERS AND PANELS 1. Remove three screws on the right side which secure the control panel. Pull the panel away Disconnect the from the oven. electrical power to the machine and follow lockout / tagout procedures. CONTROL Top Front Cover PANEL 1. The top front cover is secured with four screws, two on each side of cover. Remove these screws, then remove the cover from REMOVE the oven. SCREWS REMOVE SCREWS FAN SPEED LIGHTS HI ON LOW OFF TOP FRONT COVER SG4D SHOWN PL-56042-1 2. Dis
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30 30 35 35 40 40 45 45 50 50 55 55 MASTER SWITCH OVEN COOL ON OFF HI ON OFF LOW ON ON OFF OVEN OFF COOL THERMOSTAT POWER LEVEL TIMER FAN SPEED LIGHTS POWER LIGHTS CONTROL PANEL COMPONENTS MASTER SWITCH ON/HEAT INDICATOR LIGHTS NO IGNITION LIGHT COMPUTER CONTROLLER TEMPERATURE CONTROLLER (THERMOSTAT) POWER CONTROL NO IGNITION LIGHT TIMER POWER FAN SPEED SWITCH SWITCH LIGHT SWITCH LIGHT SWITCH SG4D/SG6D SG4C/SG6C PL-56046 PL-56045-1 Procedure Disconnect the electrical power to the machine and
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COMPONENT PANEL COMPONENTS PORCELAIN PORCELAIN BLOCK BLOCK ASSEMBLY ASSEMBLY TRANSFORMER TRANSFORMER MOTOR HEATING CONTROL RELAY RELAYS IGNITION IGNITION MODULE MODULE BOARD BOARD IGNITION IGNITION MODULE MODULE HEATING RELAY PORCELAIN PORCELAIN BLOCK BLOCK ASSEMBLY 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
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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. 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. 4. Remove the upper and lower door seals. SG4C/SG6C Temperature Probe Shown 8. Push the probe through the ove
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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 Disconnect the ignition wires. The spacers are intended electrical power to the machine and to keep the ignition wires from laying flat follow lockout / tagout procedures. on the oven chassis. Shut off the gas before servicing B. Ensure that the bracket on the back of the oven. the burner is inserted into the slot at the rear of the burner chamber. 1. Remove the lower fron
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3. Disconnect compression fittings from the GAS ORIFICE valve. 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 3. There are two gas orifices on the manifold. bracket assembly, then remove the screws Remove each orifice and replace
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IGNITION CONTROL MODULE SPARK IGNITER AND FLAME SENSE Disconnect the Disconnect the electrical power to the machine and electrical power to the machine and follow lockout / tagout procedures. follow lockout / tagout procedures. 1. Remove the right side cover as outlined Shut off the gas before servicing under Covers and Panels. the oven. 2. Loosen the screws securing the mounting 1. Remove the two gas burners as outlined bracket to the component panel and remove under Gas Burners. the bracket.
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5. Remove the screws that secure the motor BLOWER AND MOTOR mounting plate to the rear wall. 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 any damage during motor assembly removal. 7. Pull the motor assembly into the oven cavity and place it on the cardboard. 8. Remove the junction b
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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 flush with end of shaft, then tighten setscrews. 13. Adjust motor position until blower is parallel 3. Remove the lower door seal strip to
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7. The top and bottom bearings are now DOOR CATCH ROLLER ASSEMBLY accessible for inspection and/or replacement (INDEPENDENT DOORS) if needed. NOTE: For units with serial number starting with 48 A. If bearings are OK, proceed to step 8. made before 8/13/07 and serial number starting with B. If replacing the top bearing, remove the 54 made before 8/27/07. top bearing retainer and top bearing. Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Remove the top
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2. Remove the door handle, then remove the DOOR SWITCH outer door panel. 3. Lift out the inner door panel window assembly. Disconnect the 4. Remove the door seal from the inside of the electrical power to the machine and left door only. follow lockout / tagout procedures. 5. Remove the screws securing the window 1. Remove the top front cover as outlined under tabs to the door bracket and lift the window Covers and Panel. assembly out from the door frame. 2. Disconnect the lead wires to the door
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INTERIOR LIGHTS HIGH LIMIT THERMOSTAT Disconnect the Disconnect the electrical power to the machine and electrical power to the machine and follow lockout / tagout procedures. 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 2. Remove the high limit thermostat cover/ replaced, then unscrew the bulb. mounting plate. It is located at the top of the oven cavity. LENS LENS OVEN CAVITY P
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5. Attach the lead wires to the replacement Fan Installation Tips socket. • The fan must be installed so air is pulled from NOTE: Ensure the case is connected to the the rear of the oven and blown into the control green ground wire. area. The arrow on the fan body indicates airflow direction and should be pointing toward 6. Insert the socket into the hole in the oven and the controls. push until the socket is held in place by the retaining tabs. • Ensure the fan is seated squarely against the ai
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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. 8. Check for voltage to the switching output. SOLID STATE TEMPERATURE CONTROLLER TEST a. For 120 VAC controls, check across terminals J3 and J4 for input voltage and (SG4D/SG6D) between J4 and J5 for outpu
