Vulcan VC44GC Manual
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Side 1/95

VC4G & VC6G SERIES FULL SIZE
CONVECTION OVENS
VC4GS ML-126610
VC4GD ML-126611
VC4GC ML-136494
VC6GS ML-126612
VC6GD ML-126613
VC6GC ML-136495
- NOTICE -
This Manual is prepared for the use of trained Hobart 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 Hobart 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 Hobart Service Technician.
The reproduction, transfer, sale or other use of this manual, without the express written
consent of Hobart, 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.
SERVICE MANUAL
A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222
F24682 Rev. H (0621)

TABLE OF CONTENTS
SERVICE UPDATES ....................................................................................... 4
SERVICE UPDATES - VC4G / VC6G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TIS DOCUMENT LIST - VC4G AND VC6G .............................................................. 4
GENERAL .................................................................................................. 6
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CLEANING ............................................................................................. 6
REFERENCE INFORMATION .......................................................................... 6
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPECIFICATIONS ...................................................................................... 6
TOOLS ................................................................................................. 7
REMOVAL AND REPLACEMENT OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COVERS AND PANELS ................................................................................ 8
TOP FRONT COVER ............................................................................... 8
BOTTOM FRONT COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROL PANEL ................................................................................. 8
RIGHT SIDE PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROL PANEL COMPONENTS ..................................................................... 9
COMPONENT PANEL COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TEMPERATURE PROBE (VC4GD/6GD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
GAS BURNER ........................................................................................ 12
GAS ORIFICE ......................................................................................... 13
GAS SOLENOID VALVE .............................................................................. 14
IGNITION CONTROL MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SPARK IGNITER AND FLAME SENSE ................................................................ 16
BLOWER AND MOTOR ENDING AT SERIAL NUMBER 481913935 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
BLOWER AND MOTOR STARTING AT SERIAL NUMBER 481913936 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
OVEN DOORS (SIMULTANEOUS DOORS) ENDING AT SERIAL NUMBER 481907145 . . . . . . . . . . . . . . . . 20
ASSEMBLY REMOVAL ........................................................................... 20
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
OVEN DOORS (SIMULTANEOUS DOORS) STARTING AT SERIAL NUMBER 481907146 . . . . . . . . . . . . . . 21
OVEN DOORS AND BEARINGS (INDEPENDENT DOORS) ENDING AT SERIAL
NUMBER 481907145 .............................................................................. 22
DOOR CATCH BALL ASSEMBLY (INDEPENDENT DOORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
OVEN DOORS (INDEPENDENT DOORS) STARTING AT SERIAL NUMBER 481907146 . . . . . . . . . . . . . . . 23
ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DOOR WINDOW ...................................................................................... 24
DOOR SWITCH ....................................................................................... 25
MECHANICAL KX THERMOSTAT (VC4GS/6GS) ...................................................... 25
HIGH LIMIT THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
INTERIOR LIGHTS (REAR MOUNTED, ROUND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
INTERIOR LIGHTS (SIDE MOUNTED, SQUARE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
COOLING FAN ........................................................................................ 29
SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 30
SOLID STATE TEMPERATURE CONTROL CALIBRATION (VC4GD/6GD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MECHANICAL THERMOSTAT CALIBRATION (VC4GS/6GS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SOLID STATE TEMPERATURE CONTROL TEST (VC4GD/6GD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
TEMPERATURE PROBE TEST (VC4GD/6GD) ......................................................... 34
GAS PRESSURE ADJUSTMENT (UNITS UP TO FEBRUARY 2015) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
GAS VALVE PRESSURE CHECK (UNITS AFTER FEBRUARY 2015) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
VERIFICATION OF SPARK AT IGNITOR .............................................................. 37
DOOR SWITCH ADJUSTMENT ....................................................................... 37
BLOWER ADJUSTMENT .............................................................................. 38
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS
F24682 Rev. H (0621) Page 2 of 95

DOOR ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
DOOR STRIKE ADJUSTMENT (INDEPENDENT DOORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DOOR CATCH BALL ADJUSTMENT (INDEPENDENT DOORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
DOOR CHAIN ADJUSTMENT (SIMULTANEOUS DOORS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
INTRODUCTION .................................................................................. 41
PROCEDURE ..................................................................................... 41
COMPUTER CONTROL (VC4GC/VC6GC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
OPERATION ...................................................................................... 42
SETUP MODE .................................................................................... 42
PROBE TEST ..................................................................................... 43
SOLID STATE RELAY TEST ...................................................................... 43
COMPUTER CONTROL CALIBRATION FOR WATLOW CONTROLLER (VC4GC/VC6GC) . . . . . . . . . . . . . . 43
FLAME SENSE CURRENT TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
SERVICE PROGRAMMING AND TESTING FOR 3700 COMPUTER CONTROL . . . . . . . . . . . . . . . . . . . . . . . . 47
ELECTRICAL OPERATION ................................................................................ 51
COMPONENT FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
COMPONENT LOCATION ............................................................................. 52
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
VC4GS, VC6GS WITH ROAST & HOLD OPTION (MECHANICAL KX THERMOSTAT) . . . . . . . . . . . . . . 57
VC4GD, VC6GD WITH ROAST & HOLD OPTION (SOLID STATE
TEMPERATURE CONTROL) .................................................................. 62
VC4GC, VC6GC (ROAST & HOLD STANDARD ON COMPUTER MODEL) . . . . . . . . . . . . . . . . . . . . . . . . . 67
COOL DOWN CYCLE (COMPUTER CONTROL MODEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
SCHEMATICS ............................................................................................ 70
VC4GS, VC6GS MECHANICAL (KX) CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
VC4GS, VC6GS MECHANICAL (KX) CONTROLS, ROAST & HOLD OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
VC4GD, VC6GD SOLID STATE TEMPERATURE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
VC4GD, VC6GD SOLID STATE TEMPERATURE CONTROL, ROAST & HOLD OPTION . . . . . . . . . . . . . . . . 74
VC4GC, VC6GC COMPUTER CONTROL (ROAST & HOLD STANDARD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
VC4GD & VC6GD, VC WITH STANDING PILOT 120 & 200 VOLT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
WIRING DIAGRAMS ...................................................................................... 78
VC4GS, VC6GS MECHANICAL (KX) CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
VC4GS, VC6GS MECHANICAL (KX) CONTROLS, ROAST & HOLD OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
VC4GD, VC6GD SOLID STATE TEMPERATURE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
VC4GD, VC6GD SOLID STATE TEMPERATURE CONTROL, ROAST & HOLD OPTION . . . . . . . . . . . . . . . . 85
VC4GC, VC6GC COMPUTER CONTROL (ROAST & HOLD STANDARD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
VC4GD & VC6GD, VC WITH STANDING PILOT 120 & 200 VOLT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
ALL MODELS ......................................................................................... 91
IGNITION MODULE DIAGNOSTICS ................................................................... 92
COMPUTER CONTROL MODELS ONLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
ERROR CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS
© VULCAN 2021
Page 3 of 95 F24682 Rev. H (0621)

SERVICE UPDATES
SERVICE UPDATES - VC4G / VC6G
June 2021
• Added Fig. 118.
March 2020
• Added VC4GD & VC6GD, VC With Standing
Pilot 120 & 200 VOLT.
June 2019
• Added SERVICE PROGRAMMING AND
TESTING FOR 3700 COMPUTER CONTROL.
October 2018
Updated and Added Data Modules
• BLOWER AND MOTOR Starting at Serial
Number 481913936
• OVEN DOORS (SIMULTANEOUS DOORS)
Starting at Serial Number 481907146
• OVEN DOORS (INDEPENDENT DOORS)
Starting at Serial Number 481907146
• INTERIOR LIGHTS (Side Mounted, Square)
• INTERIOR LIGHTS (Rear Mounted, Round)
• DOOR ADJUSTMENT
• COMPONENT LOCATION
• FLAME SENSE CURRENT TEST
• VC4GS, VC6GS Mechanical (KX) Controls,
Roast & Hold Option
• VC4GD, VC6GD Solid State Temperature
Control
• VC4GC, VC6GC Computer Control (Roast &
Hold Standard)
• IGNITION MODULE DIAGNOSTICS
TIS DOCUMENT LIST - VC4G AND VC6G
SERVICE TAB
Document Title Document Type
VC4G and VC6G Service Manual Service Manual
Watlow Controller Replaced By NCC Controller Technical Service Bulletin (TSB)
SERVICE TAB (Multimedia)
Document Title Document Type
DID You Know - VC4GD Misc.
3700 Oven Quick Start Guide Operator
Repair Flood-Damaged Food Equipment Misc
Convection Oven Computer Control Guide Operator
VC4GD, VC4GC, VC6GD, VC6GC, HGC5, HGC5X,
HGC5D, HGC5DX, & WKGD Installation and Operation I &O Manual
Fundamentals of Gas Service Instructions
TSB 1037A Hobart to Vulcan "Common" Model Cross
Reference List Technical Service Bulletin (TSB)
Technical Service Bulletin (TSB)
Rating Plate Locations on Current Vulcan-Hart/Wolf
Range Equipment Service Bulletin
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE UPDATES
F24682 Rev. H (0621) Page 4 of 95

PARTS TAB
Document Title Document Type
Part Catalog for VC4G and VC6G Parts Catalog
DIAGRAMS TAB
Document Title Document Type
HGC5, DGC5, VC4G, WKGD Series Wiring Diagram
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE UPDATES
Page 5 of 95 F24682 Rev. H (0621)

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.
Models
MODEL
FEATURES OPTIONS
CAVITY
DEPTH
TEMPERTURE
CONTROL
DOORS
(50/50)
COOK
TIMER
COOK
TIMER
OR
HOLD
TIMER
COOK
&
HOLD
BLOWER
208/240/60/1
VC4GS 26.5" Mechanical (KX) Independent 1 21-Hour Dial 5-Hour Dial Optional Optional
VC6GS 30.5" Mechanical (KX) Independent 1 21-Hour Dial 5-Hour Dial Optional Optional
VC4GD 26.5" Solid State Independent 1 31-Hour Dial 5-Hour Dial Optional Optional
VC6GD 30.5" Solid State Independent 1 31-Hour Dial 5-Hour Dial Optional Optional
VC4GC 26.5" Computer Independent 1 324-Hour
Digital Built in Built in Optional
VC6GC 30.5" Computer Independent 1 324-Hour
Digital Built in Built in Optional
1 Simultaneous doors are optional (with or w/o window).
2 Stainless steel doors w/o window (standard).
3 Stainless steel doors with window (standard).
INSTALLATION
Refer to the Instructions Manual for detailed
installation instructions on single or stacked ovens.
OPERATION
Refer to the Instructions Manual for specific operating
instructions.
CLEANING
Refer to the Instructions Manual for specific cleaning
instructions.
REFERENCE INFORMATION
Refer to the Parts Catalog F43031 for parts
information.
LUBRICATION
• Cavity blower motor has sealed bearings and
requires no additional lubrication.
• Huskey™ TF-1000 grease or equivalent high
temperature Teflon grease.
SPECIFICATIONS
Electrical
Voltage - 120/60/1
Amps - 8.0 Amps
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - GENERAL
F24682 Rev. H (0621) Page 6 of 95

Input BTU Rating
Natural Gas - 44,000 BTU input at 3.5 in. W.C.
Units after Serial Number Break (VC4GD 481835388,
VC6GD 481835406, VC4GD 541077665) Natural
Gas - 50,000 BTU input at 5.0 in. W.C.
Propane Gas - 44,000 BTU input at 10.0 in. W.C.
Units after Serial Number Break (VC4GD 481835394
& 541077965, VC6GD 481835429) Propane Gas -
50,000 BTU input at 10.0 in. W.C.
Gas Line Pressures
Natural - Recommend (in. W.C.) 7.0, Min 5.0
Natural - Recommend (in W.C.) 8.0, Min 6.0 for Units
after Serial Number Break (VC4GD 481835388,
VC6GD 481835406, VC4GD 541077665)
Propane - Recommend (in. W.C.) 11.0, Min 11.0 (All
Propane Units)
Maximum 14.0 in. W.C. (Nat. or Prop.)
TOOLS
Standard
• Standard set of hand tools
• VOM with ability to measure micro amp current
VOM with minimum of NFPA-70E CAT III 600V,
UL/CSA/TUV listed. Sensitivity of at least 20,000
ohms per volt. Meter leads must also be rated at
CAT III 600V.
• Gear Puller to remove blower
Special
• Temperature tester (thermocouple type)
• Manometer
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - GENERAL
Page 7 of 95 F24682 Rev. H (0621)

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.
Top Front Cover
1. The top front cover is secured with four (4)
screws, two on each side of cover. Remove these
screws then remove the cover from the oven.
Fig. 1
2. Reverse the procedure to install.
Bottom Front Cover
1. The bottom front cover is secured with four (4)
screws, two on each side of cover. Remove these
screws then remove the cover from the oven.
Fig. 2
2. Reverse the procedure to install.
Control Panel
1. Remove three (3) screws on the right side which
secure the control panel then pull the panel away
from the oven.
Fig. 3
NOTE: If the oven has a mechanical (KX type)
thermostat, it must be removed from the control panel
first, before removing the control panel.
2. Disconnect the temperature probe leads from the
solid state temperature control.
3. Unplug the wire harness connector to the control
panel components.
4. Reverse the procedure to install.
Right Side Panel
1. Remove the screws which secure the right side
of the top front cover, bottom front cover and
control panel.
2. Remove the remaining six screws securing the
right side panel.
Fig. 4
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F24682 Rev. H (0621) Page 8 of 95

3. Pull the right side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
CONTROL PANEL COMPONENTS
Disconnect the electrical power to
the machine and follow lockout /
tagout procedures.
Removable Components Procedure
1. Remove the Control Panel.
2. Remove the component being replaced.
3. Reverse the procedure to install the replacement
component, then check oven for proper
operation.
Fig. 5
Fig. 6
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
Page 9 of 95 F24682 Rev. H (0621)
Produkt Specifikationer
Mærke: | Vulcan |
Kategori: | Ovn |
Model: | VC44GC |
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