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SERVICE MANUAL
HALF-SIZE
CONVECTION OVENS
ELECTRIC AND GAS
MODEL ML
ELECTRIC
ECO2D 114570
ECO2C 114572
GAS
GCO2D 114569
GCO2C 114571
GCO2D Shown
- 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 t
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HALF-SIZE CONVECTION OVENS TABLE OF CONTENTS GENERAL ............................................................................. 3 Introduction ....................................................................... 3 Specifications ..................................................................... 3 Gas Ovens ................................................................ 3 Electric Ovens ............................................................. 3 Tools ...............................
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HALF-SIZE CONVECTION OVENS - GENERAL GENERAL INTRODUCTION General This manual will cover half-size electric and gas convection ovens that use either a solid state control or an electronic 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 AMP/LINE (Watts) Natural Propane Natural Propane 120V Single Oven 2500 2500 3.5" W.C. 10"W.C. 950 8 Stacked Oven 5000 5000 3.5
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS Right Side Panel 1. Remove the three screws which secure the right WARNING: DISCONNECT THE ELECTRICAL side of the control panel. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX 2. Loosen the two screws on the right side of the top INDICATING THE CIRCUIT IS BEING SERVICED. front cover. WARNING: SHUT OFF THE GAS BEFORE 3. Remove the remaining eight screws s
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 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. Disconnect the wire leads at the component to be replaced. 3. Remove the component. 4. Reverse the procedure to install the new component, then check oven for proper operation. 5
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS BLOWER AND/OR BLOWER 8. Disconnect the wire leads to the motor. MOTOR A. P1 (purple) to wire# 11 B. Orange (Low speed) to wire# 12 WARNING: UNPLUG UNIT BEFORE SERVICING. C. Blue (high speed) to wire# 13 D. Red wires connected together. 1. Remove racks and the right rack support. 9. Remove the bolts that secure the motor to the 2. Remove baffle panel by lifting up and out. motor mounting plate and remove the motor from the oven. 3. For
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS OVEN DOOR Disassembly Removal 1. Open the door. WARNING: UNPLUG UNIT BEFORE SERVICING. 2. Remove the door handle and latch plate. 1. Remove the top front cover as outlined under 3. Remove the screws which secure the inner and "COVERS AND PANELS". outer door panels to the door frame. 2. Remove the door switch lever from the door shaft. 3. Remove the door switch bracket. 4. While supporting the door, remove the bearing, 4. Remove the in
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS DOOR SWITCH HEAT EXCHANGER (GAS WARNING: UNPLUG UNIT BEFORE SERVICING. OVENS) 1. Remove the top front cover as outlined under UNPLUG UNIT BEFORE SERVICING. WARNING: "COVERS AND PANELS". WARNING: SHUT OFF THE GAS BEFORE 2. Disconnect the leads to the door switch. SERVICING THE UNIT. 3. Remove the switch which is secured by two 1. Remove racks and the right rack support. screws. 2. Remove baffle panel by lifting up and out. 3. Remove t
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS BURNER (GAS OVENS) GAS VALVE (GAS OVENS) WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: SHUT OFF THE GAS BEFORE WARNING: SHUT OFF THE GAS BEFORE SERVICING THE UNIT. SERVICING THE UNIT. WARNING: ALL GAS JOINTS DISTURBED 1. Remove racks and the right rack support. DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH A SOAP AND WATER 2. Remove baffle panel by lifting up and out. SOLUTION (BUBBLES
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS HEATING ELEMENTS TEMPERATURE PROBE (ELECTRIC OVENS) Procedure WARNING: DISCONNECT THE ELECTRICAL WARNING: UNPLUG UNIT BEFORE SERVICING. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT 1. Remove the control panel as outlined under BOX INDICATING THE CIRCUIT IS BEING "COVERS AND PANELS". SERVICED. 2. Disconnect the probe leads at the temperature 1. Remove racks and the right rack support. control. 2. Remove baff
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING: 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, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST. TEMPERATURE PROBE VERIFICATION OF SPARK TEST (ALL MODELS) AT SPARK PROBE WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: UNPLU
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS GAS TYPE SETTING AT OUTPUT GAS PRESSURE OF GAS VALVE ADJUSTMENT Natural 3.5 inches W.C. WARNING: UNPLUG UNIT BEFORE SERVICING. Propane 10 inches W.C. WARNING: SHUT OFF THE GAS BEFORE NOTE: If input pressure is below 4.0 (Natural) or SERVICING THE UNIT. 10.5 (Propane) inches W.C., the desired output cannot be obtained and the oven will overate at a 1. Remove the right side panel and control panel lower BTU. as outlined under “COV
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS ELECTRONIC CONTROL SPECIAL KEY FUNCTIONS - To activate these functions press the specified keys while turning the oven on. You can not toggle between functions. Each function has to be entered from the off position. NOTE: There are four hidden keys on the control. See diagram following the table. HOLD KEYS 1 & 3 4 & 9 6 & 8 FUNCTION Calibration Mode Change between ( C & ( F Display test CALIBRATE OVEN - Perform Calibration at 3
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS SOLID STATE CONTROL SOLID STATE CONTROL CALIBRATION TEST 1. Place a thermocouple in the geometric center Oven temperature must be below 450 ( F. NOTE: of the oven cavity. 1. Remove the screws from the control panel and 2. Set the On-Off-Cool Down switch to ON. pull the control panel away from the oven to access the control wiring. 3. Set the temperature control to 350 degrees F. 2. Place a thermocouple in the geometric center 4
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 8. If the average temperature differs more than 10 degrees F from the dial settings: DOOR SWITCH A. Pencil mark the knob pointer position as a reference point on the control panel next ADJUSTMENT to the dial plate. WARNING: DISCONNECT THE ELECTRICAL B. Remove the temperature control knob. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. 1. Remove the upper fro
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS DOOR REVERSAL 7. Remove the door switch from the switch mounting bracket. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN A. Use the other set of holes in the mounting CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT bracket to mount the switch. BOX INDICATING THE CIRCUIT IS BEING SERVICED. 1. Remove the door as outlined under “OVEN DOOR”. A. Remove the door strike plate from the top of the door. B. Rotate the door 18
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS DOOR ADJUSTMENT BLOWER ADJUSTMENT WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN 1. The door should be parallel with the face of the CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT oven cavity. BOX INDICATING THE CIRCUIT IS BEING SERVICED. 1. Remove rack and rack supports. 2. Remove baffle panel by lifting up and out. 3. Check the blower. It should be ¼" away from and parallel
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION POWER SWITCH ............. Controls power to oven. COOLDOWN SWITCH ......... Prevents heaters from operating and allows fan to run. (On some solid state control models, this switch is combined with the power switch) FAN SPEED SWITCH .......... Controls speed of oven cavity blower motor. (Electric ovens) SOLID STATE CONTROL ....... Controls oven temperature. TIMER ..................... Signals end of timed
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION COMPONENT LOCATION 19
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION Gas Oven SEQUENCE OF OPERATION NOTE: A combination of terminal numbers and wire numbers will be used to describe the circuit paths. The Ignition Module complete path will be described when a component is energized. 1. 24VAC supplied to ignition module as described under oven sequence of operation Solid State Control (Gas) A. 15 second prepurge period NOTE: Use GCO2D Schematic 1) No-ignition light is on 2) Cavity blower motor removes any 1. Condi
