Vulcan-Hart ECO2C User manual

A product of VULCAN-HART LOUISVILLE, KY 40201-0696
Form 24575 (12/96)
- 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 attendedaVulcanServiceSchool forthis 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.
Reproduction or other use of this Manual, without the express
written consent of Vulcan-Hart, is prohibited.
SERVICE MANUAL
HALF-SIZE
CONVECTION OVENS
ELECTRIC AND GAS
MODEL ML
ELECTRIC
ECO2D 114570
ECO2C 114572
GAS
GCO2D 114569
GCO2C 114571
GCO2D Shown

HALF-SIZE CONVECTION OVENS
2
TABLE OF CONTENTS
GENERAL............................................................................. 3
Introduction ....................................................................... 3
Specifications ..................................................................... 3
GasOvens................................................................ 3
ElectricOvens ............................................................. 3
Tools ............................................................................ 3
REMOVALANDREPLACEMENTOFPARTS ................................................. 4
Covers and Panels ................................................................. 4
Control Panel Components ........................................................... 5
BlowerAnd/orBlowerMotor........................................................... 6
OvenDoor........................................................................ 7
DoorSwitch....................................................................... 8
Heat Exchanger (Gas Ovens) ......................................................... 8
Burner(GasOvens)................................................................. 9
GasValve(GasOvens).............................................................. 9
HeatingElements(ElectricOvens) .................................................... 10
SERVICEPROCEDURESANDADJUSTMENTS .............................................. 11
Temperature Probe Test (All Models) .................................................. 11
VerificationofSparkatSparkProbe ................................................... 11
GasPressureAdjustment ........................................................... 12
SparkIgnitionControlTest .......................................................... 12
ElectronicControl ................................................................. 13
SolidStateControlTest............................................................. 14
SolidStateControlCalibration........................................................ 14
DoorSwitchAdjustment............................................................. 15
DoorReversal .................................................................... 16
DoorAdjustment .................................................................. 17
BlowerAdjustment................................................................. 17
ElementTest..................................................................... 17
ELECTRICALOPERATION .............................................................. 18
Component Function ............................................................... 18
Component Location ............................................................... 19
Sequence of Operation ............................................................. 20
Ignition Module ............................................................ 20
GasOven................................................................ 20
ElectricOven............................................................. 23
SchematicsGasOvens............................................................. 26
GCO2D ................................................................. 26
GCO2C ................................................................. 27
WiringDiagram-GasOvens......................................................... 28
GCO2D ................................................................. 28
GCO2C ................................................................. 30
Schematic-ElectricOvens ........................................................... 32
ECO2D ................................................................. 32
ECO2C ................................................................. 33
WiringDiagramElectricOvens ....................................................... 34
ECO2D ................................................................. 34
ECO2C ................................................................. 36
TROUBLESHOOTING .................................................................. 38
ElectricOvens.................................................................... 38
GasOvens ...................................................................... 39
© VULCAN 1996

HALF-SIZE CONVECTION OVENS - GENERAL
3
GENERAL
INTRODUCTION
General
Thismanual willcoverhalf-sizeelectricand gasconvection ovensthat useeither asolid state control or anelectronic
control.
Procedures in this manual are applicable to both gas and electric ovens unless specified.
SPECIFICATIONS
GAS OVENS
GAS DATA ELECTRICAL DATA
INPUT BTU/HR MANIFOLD PRESSURE LOAD
(Watts) AMP/LINE
Natural Propane Natural Propane 120V
Single Oven 2500 2500 3.5" W.C. 10"W.C. 950 8
Stacked Oven 5000 5000 3.5" W.C 10"W.C. 1900 16
ELECTRIC OVENS
TOTAL
KW
3-PHASE LOADING
(KW PER PHASE)
NOMINAL AMPS PER LINE WIRE
3 PHASE 1 PHASE
208V 240V 208V 240V
L1-L2 L2-L3 L1-L3 L1 L2 L3 L1 L2 L3
Single Oven 5.5 2.5 0 3.0 22.9 10.4 12.5 19.9 9.0 10.9 26.5 23.0
Stacked
Ovens 11.0 5.0 0 6.0 45.8 20.8 25.0 39.7 18.0 21.7 52.9 45.9
TOOLS
• Standard set of hand tools
• VOM with AC current tester (Any VOM with a sensitivity of at least 20,000 ohms per volt can be used.)
• Temperature tester
• Manometer (Gas Ovens)

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
4
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN CIRCUIT
BOX. PLACE A TAG ON THE CIRCUIT BOX
INDICATING THE CIRCUIT IS BEING SERVICED.
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT. (When applicable)
Top Front Cover
1. The top front cover is secured with four screws,
two on each side of cover. Remove these screws
then pull cover off unit.
2. Reverse the procedure to install.
Control Panel
1. On gas models, remove the handle from the
manual gas valve.
2. Remove the three screws from the left front and
loosen the three screws on the right side of the
control panel.
3. Pull the panel away from the oven.
4. Unplug the lead wires to the control panel
components and disconnect the temperature
probe leads.
5. Reverse the procedure to install.
Right Side Panel
1. Remove the three screws which secure the right
side of the control panel.
2. Loosen the two screws on the right side of the top
front cover.
3. Remove the remaining eight screwssecuring the
right side panel.
4. Pull the right side panel out at the bottom then
down to remove.
5. Reverse the procedure to install.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
5
CONTROL PANEL
COMPONENTS
Removable Components
Listed on the illustration.
Procedure
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the control panel as outlined under
"COVERS AND PANELS".
2. Disconnectthewireleadsatthecomponent tobe
replaced.
3. Remove the component.
4. Reverse the procedure to install the new
component, then check oven for proper
operation.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
6
BLOWER AND/OR BLOWER
MOTOR
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. For gas ovens only, remove the heat exchanger
as outlined under “HEAT EXCHANGER”.
4. Loosen set screws on blower hub.
5. Remove blower from motor shaft. You may have
to use a bearing puller.
6. If the blower only is to be replaced, reverse
procedure to install and check blower to be
parallel with the motormountingplateasoutlined
under "BLOWER ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS”. If the
motor is to be replaced, continue to step 7.
7. Remove the right side panel.
8. Disconnect the wire leads to the motor.
A. P1 (purple) to wire# 11
B. Orange (Low speed) to wire# 12
C. Blue (high speed) to wire# 13
D. Red wires connected together.
9. Remove the bolts that secure the motor to the
motormountingplateandremovethemotorfrom
the oven.
10. Place new motor in position on the motor
mounting plate and route the wiring through the
grommet in the component panel.
11. Install mounting padsand bolts. DO NOT tighten
mounting bolts.
12. Slide the blower onto motor shaft until hub is
flush with end of shaft and tighten set screws.
13. Adjust motor position until blower is parallel to
oven cavity wall with a spacing of ¼" as outlined
under "BLOWER ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
14. Install baffle panel, rack guides and racks.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
7
OVEN DOOR
Removal
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the top front cover as outlined under
"COVERS AND PANELS".
2. Remove the door switch lever from the door
shaft.
3. Remove the door switch bracket.
4. While supporting the door, remove the bearing,
door plate and spacer.
5. Lift the door from the lower bearing.
6. Reverse procedure to install door assembly and
check for proper adjustment as outlined under
"DOOR ADJUSTMENT" and "DOOR SWITCH
ADJUSTMENT" in "SERVICE PROCEDURES
AND ADJUSTMENTS".
Disassembly
1. Open the door.
2. Remove the door handle and latch plate.
3. Remove the screws which secure the inner and
outer door panels to the door frame.
4. Remove the inner and outer door panel.
5. Remove the four screws and lift the window
assembly out.
NOTE: Use high temperature silicone between
the window and the door panel.
6. Reverse the procedure to install the new window
and adjust the door as outlined under “DOOR
ADJUSTMENT”.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
8
DOOR SWITCH
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the top front cover as outlined under
"COVERS AND PANELS".
2. Disconnect the leads to the door switch.
3. Remove the switch which is secured by two
screws.
4. Reverse the procedure to install the new
switch.
5. Adjust the door switch as outlined under
"DOOR SWITCH ADJUSTMENT" in
"SERVICE PROCEDURES AND
ADJUSTMENTS".
HEAT EXCHANGER (GAS
OVENS)
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove the screws that secure the heat
exchanger and remove it from the oven.
4. Reverse procedure to install.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
9
BURNER (GAS OVENS)
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove the right side panel as outlined under
“COVERS AND PANELS”.
4. Disconnect the lead wires to the electrode
assembly.
5. Remove the heat exchanger as outlined under
“HEAT EXCHANGER”.
6. Remove the screws from the burner bracket
and pull the burner into the oven cavity.
7. Remove the screws that secure the electrodes
to the burner bracket.
8. Reverse procedure to install.
NOTE: When installed, the electrodes are
positioned toward the front of the oven.
GAS VALVE (GAS OVENS)
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
WARNING: ALL GAS JOINTS DISTURBED
DURING SERVICING MUST BE CHECKED FOR
LEAKS. CHECK WITH A SOAP AND WATER
SOLUTION (BUBBLES). DO NOT USE AN OPEN
FLAME.
A. CHECK ALL JOINTS PRIOR TO THE
GAS VALVE BEFORE LIGHTING UNIT.
B. CHECK ALL JOINTS BEYOND GAS
VALVE AFTER UNIT IS LIT.
1. Remove the right side panel and control panel
as outlined under “COVERS AND PANELS”.
2. Disconnect the lead wires at the gas valve.
3. Disconnect the gas line fitting going to the
burner at the top of the gas valve.
4. Remove the gas valve from the nipple between
the it and the manual gas valve.
5. Reverse procedure to install.
6. Adjust the gas valve as outlined under “GAS
PRESSURE ADJUSTMENT”.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
10
HEATING ELEMENTS
(ELECTRIC OVENS)
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove the right side panel as outlined under
“COVERS AND PANELS”.
4. Disconnect the lead wires to the heating
elements.
5. Remove the screws from the clamps that
secure the heating element assembly.
6. Pull the top of the heating element assembly
into the oven cavity until the ends of the
elements are inside the oven cavity. Lift up and
remove the lower clamp from between the side
wall and the bottom of the oven cavity.
7. Remove the clamps from the heating element
assembly and replace the element(s).
8. Reverse procedure to install.
TEMPERATURE PROBE
Procedure
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the control panel as outlined under
"COVERS AND PANELS".
2. Disconnect the probe leads at the temperature
control.
3. Remove probe from the probe guard and push
it thru the oven wall into the control panel area.
NOTE: When installing, only the metal surface of
the probe should be inserted into the probe guard.
NOTE: The probe may have to be inserted at an
angle. The hole in the inside oven cavity wall may
not line up straight with the oven cavity outer shell.
4. Reverse the procedure to install the new probe.
5. Adjust the temperature control as outlined
under "TEMPERATURE CONTROL
CALIBRATION" in "SERVICE PROCEDURES
AND ADJUSTMENTS".