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This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified.
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 its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
The reproduction, transfer, sale or other use of this Manual,
without the express written consent of Vulcan, is prohibited.
This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.
A product of Vulcan-Hart
SERVICE MANUAL
SG SERIES GAS CONVECTION
OVENS
MODELS
STACKED
MODELS
- NOTICE -
3600 North Point Blvd Baltimore, MD 21222
SG4
SG6
SG44
SG66
F45525 (0814)
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Table of Contents
Related Manuals for Vulcan-Hart SG SERIES
Summary of Contents for Vulcan-Hart SG SERIES
- Page 1 SERVICE MANUAL SG SERIES GAS CONVECTION OVENS MODELS STACKED SG44 MODELS SG66 - NOTICE - This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. This manual is not intended to be all encompassing. If you have...
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Page 2: Table Of Contents
SG SERIES GAS CONVECTION OVENS TABLE OF CONTENTS GENERAL ....................3 INTRODUCTION . -
Page 3: General
SG SERIES GAS CONVECTION OVENS - GENERAL GENERAL any model unless the picture or illustration needs to INTRODUCTION be model specific. Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of MODELS FEATURES... -
Page 4: Removal And Replacement Of Parts
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. -
Page 5: Control Panel Components
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS CONTROL PANEL COMPONENTS COMPONENT PANEL COMPONENTS Disconnect the electrical power to the machine and Disconnect the follow lockout / tagout procedures. electrical power to the machine and follow lockout / tagout procedures. -
Page 6: Temperature Probe
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS NOTE: If right side panel is not accessible, this component can be serviced by removing the CONTROL PANEL. Disconnect the probe leads from the solid state temperature control. Remove the racks and right rack support. -
Page 7: Gas Orifice
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Disconnect the ignition cable and the flame GAS ORIFICE sense lead wire. Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. -
Page 8: Gas Solenoid Valve
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS GAS SOLENOID VALVE Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. All gas joints disturbed during servicing must be checked for leaks. -
Page 9: Ignition Control Module
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS IGNITION CONTROL MODULE Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. Remove the RIGHT SIDE PANEL. -
Page 10: Spark Igniter And Flame Sense
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Remove the ignition module board from the BLOWER AND MOTOR mounting bracket. Reverse the procedure to install the replacement ignition module board. Disconnect the electrical power to the machine and SPARK IGNITER AND FLAME follow lockout / tagout procedures. - Page 11 SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 27 Fig. 25 Place a piece of cardboard on the bottom of the If replacing: oven cavity to protect its surface from any Blower Only - Loosen set screws on blower damage during motor assembly removal.
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Page 12: Oven Doors And Bearings (Independent Doors)
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 29 Remove the lower door seal strip to expose the mounting screws of the door assembly. Remove the two (2) lower sill bolts by the lower door shaft and the four (4) counter-sunk screws from the lower sill. -
Page 13: Roller Latch Assembly (Independent Doors)
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS If replacing the bottom bearing, remove it from the door shaft or the lower sill opening. Reverse procedure to install door assembly and check for proper adjustment as outlined under DOOR ADJUSTMENT and DOOR SWITCH ADJUSTMENT. -
Page 14: Door Switch
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 35 Reverse procedure to install the replacement switch and check for proper adjustment as outlined under DOOR SWITCH ADJUSTMENT. HIGH LIMIT THERMOSTAT Disconnect the electrical power to the machine and follow lockout / tagout procedures. -
Page 15: Interior Lights
SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Lamp Assembly Remove the lens and bulb. Remove the springs from the retaining tabs (2 places) on the socket. - Page 16 SG SERIES GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 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 and remove the fan.
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Page 17: Service Prodcedures And Adjustments
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS SERVICE PRODCEDURES 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 and follow Arc Flash procedures. -
Page 18: Solid State Temperature Control Test
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS For 120VAC controls - check across SOLID STATE TEMPERATURE terminals T4 & T2 for input to the internal CONTROL TEST relay and T5 & T2 for output from the internal relay. -
Page 19: Gas Valve Pressure Check
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS If the measured resistance values are inside Remove the plug from the manifold pressure the given tolerance then the probe is port. functioning properly. If the measured resistance values are outside the given tolerance then replace the probe and retest. -
Page 20: Door Switch Adjustment
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS SHUT OFF THE GAS BEFORE DOOR SWITCH ADJUSTMENT SERVICING THE UNIT. Remove the BOTTOM FRONT COVER. Disconnect the Disconnect the high voltage "ignition cable" from electrical power to the machine and the spark ignitor. -
Page 21: Door Adjustment
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS Adjust the motor position until the blower is parallel to and 1/4 inch away from the motor mounting plate. Check for squareness of the blower to the motor mounting plate at the top, bottom, left and right of the blower. -
Page 22: Door Strike Adjustment (Independent Doors)
SG SERIES GAS CONVECTION OVENS - SERVICE PRODCEDURES AND ADJUSTMENTS Move the door until proper alignment is achieved Each oven door should open with a force of 8 to then tighten the screws on the upper door 25 pounds when pulled at the handle. The bearing hardware. -
Page 23: Electrical Operation
SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Power Switch (S1) . . . Determines the mode of operation; ON, OFF, or COOL DOWN. Oven Light Switch (S2) Controls the oven cavity lights...... -
Page 24: Component Location
SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION COMPONENT LOCATION Fig. 50 F45525 (0814) Page 24 of 31... -
Page 25: Sequence Of Operation
SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION Fig. 51 Schematic diagram AI3691 will be used to explain the SEQUENCE OF OPERATION electrical sequence of operation. Normal Cycle SG4, SG6 (Solid State Temperature Control) Conditions. Page 25 of 31 F45525 (0814) - Page 26 SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION Oven connected to correct voltage. Power (24VAC) to one side of the following components: heat relay L1 (HOT) to power switch (S1). (R3) normally open (N.O.) L2 (NEUTRAL or SECOND LINE) to...
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Page 27: Cool Down Cycle (Solid State Temperature Control)
SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION No ignition light (red) comes Oven cavity temperature needs to be ON, module performs a self lowered. diagnostic test for 4 seconds, Doors are open. 2nd valve (main) on the gas valve is energized. Gas... -
Page 28: Schematics
SG SERIES GAS CONVECTION OVENS - ELECTRICAL OPERATION SCHEMATICS Fig. 52 WIRING DIAGRAM See Wiring Diagram AI3692 F45525 (0814) Page 28 of 31... -
Page 29: Troubleshooting
SG SERIES GAS CONVECTION OVENS - TROUBLESHOOTING TROUBLESHOOTING Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily accessible, disconnect power and follow Lockout/Tagout procedures, attach test equipment and reapply power to test. -
Page 30: Vulcan
SG SERIES GAS CONVECTION OVENS - TROUBLESHOOTING SYMPTOMS POSSIBLE CAUSES Line voltage. Power switch (S1) malfunction. Blower motor doesn’t run with 1S in “Cool Down” or “On” Switch (S3) malfunction. position. Interconnecting wiring malfunction. Motor inoperable. Door switch malfunction. Blower motor doesn’t run in “On” position. “Cool Down”... - Page 31 SG SERIES GAS CONVECTION OVENS - TROUBLESHOOTING SYMPTOMS POSSIBLE CAUSES Interconnecting wiring malfunction. 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.