Vulcan ECO2C Service Manual

SERVICE MANUAL

HALF-SIZE CONVECTION OVENS ELECTRIC AND GAS

MODEL ML

ELECTRIC

GCO2D Shown

This Manual is prepared for the use of train ed Vulcan Service Technicians and should not be used by those not properly qualif ied. If you have att ended a Vu lcan Service School for this product, you may be qualified to perform all the procedures described in this man ual.

Thi s manu al i s no t i nten ded to be al l en comp assi ng . I f you have not attende d a Vulcan Servic e School f or this produc t, 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 th e necessary t oo ls, in strument s and skills should be performed b y a trained Vu lcan Service Technician .

ECO2D 114570 ECO2C 114572

GAS

GCO2D 114569 GCO2C 114571

- NOTICE -

Reproduction or other use of this Manual, without the express written consent of Vulcan-Hart, is prohibited.

A product of VULCAN-HART LOUISVILLE , KY 40201-0696 Form 24575 ( 12/96)

HALF-SIZE CONVECTION OVENS

TABLE OF CONTENTS

GENERAL............................................................................. 3

Introduction ....................................................................... 3

Specifications ..................................................................... 3

Gas Ovens................................................................ 3

Electric Ovens ............................................................. 3

Tools............................................................................ 3

REMOVAL AND REPLACEMENT OF PARTS ................................................. 4

Covers and Panels ................................................................. 4

Control Panel Components ........................................................... 5

Blower And/or Blower Motor........................................................... 6

Oven Door........................................................................ 7

Door Switch....................................................................... 8

Heat Exchanger (Gas Ovens) ......................................................... 8

Burner (Gas Ovens)................................................................. 9

Gas Valve (Gas Ovens).............................................................. 9

Heating Elements (Electric Ovens) .................................................... 10

SERVICE PROCEDURES AND ADJUSTMENTS .............................................. 11

Temperat ure Probe Test (Al l Models) .................................................. 11

Verification of Spark at Spark Probe ................................................... 11

Gas Pressure Adjustment ........................................................... 12

Spark Ignition Control Test .......................................................... 12

Electronic Control ................................................................. 13

Solid State Control Test............................................................. 14

Solid State Control Calibration........................................................ 14

Door Switch Adjustment............................................................. 15

Door Reversal .................................................................... 16

Door Adjustment .................................................................. 17

Blower Adjustment................................................................. 17

Element Test..................................................................... 17

ELECTRICAL OPERATION .............................................................. 18

Component Func tion ............................................................... 18

Component Locat ion ............................................................... 19

Sequence of O per ation ............................................................. 20

Ignition Module ............................................................ 20

Gas Oven................................................................ 20

Electric Oven ............................................................. 23

Schematics Gas Ovens............................................................. 26

GCO2D ................................................................. 26

GCO2C ................................................................. 27

Wiring Diagram - Gas Ovens......................................................... 28

GCO2D ................................................................. 28

GCO2C ................................................................. 30

Schematic-Electric Ovens ........................................................... 32

ECO2D ................................................................. 32

ECO2C ................................................................. 33

Wiring Diagram Electric Ovens ....................................................... 34

ECO2D ................................................................. 34

ECO2C ................................................................. 36

TROUBLESHOOTING .................................................................. 38

Electric Ovens.................................................................... 38

Gas Ovens ...................................................................... 39

HALF-SIZE CONVECTION OVENS - GENERAL

GENERAL

INTRODUCTION

General

This manual will cover half-s ize ele ctric and gas convection ovens that use either a solid state control or an electronic control.

Procedures in this manual are applicable t o both gas and electric ovens unless specified.

SPECIFICATIONS

GAS OVENS

GAS DATA ELECTRICAL DATA

INPUT BTU/HR MANIFOLD PRESSURE LOAD

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

NOMINAL AMPS PER LINE WIRE

3-PHASE LOADING

TOTAL

Single O ven 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

(KW PER PHASE)

208V 240V 208V 240V

L1-L2 L2-L3 L1-L3 L1 L2 L3 L1 L2 L3

3 PHASE 1 PHASE

(Watts)

AMP/LINE

TOOLS

• Standard set of hand tools

• VOM with AC c ur r ent tester (Any VO M wi th a sensitivity of at least 20, 000 ohms per volt can be used.)

• Temperat ure tester

• Manometer (Gas Ov ens)

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

REMOVAL AND REPLACEMENT OF PARTS

COVERS AND PANELS

WARNING:

POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATI NG THE CIRCUIT IS BEING SE RV ICED.

WARNING:

SERVICING THE UNIT. (When appl icable)

Top Front Cover

1. The t op f ront cover is secured with f our screws, two on each side of cover. Remove these screws then pull c over off uni t.

2. Reverse the procedure to install.

DISCONNECT THE ELECTRICAL

SHUT OFF THE GAS BEFORE

Right Side Panel

1. Remove the three screws which secure the right side of the c ontrol panel.

2. Loosen the two screws on the right side of the top front c over.

3. Remove the remaining eight screws securing the right side panel.

4. Pul l the right side panel out at t he bottom then down to remove.

5. 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 ri ght side of the control panel.

3. Pul l the panel away f r om the oven.

4. Unplug the lead wires to the control panel components and disconnect the temperature probe leads.

5. Reverse the procedure to install.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

CONTROL PANEL

COMPONENTS

Removable Components

Listed on the illustration.

Procedure WARNING

1. Remove the control panel as outlined under

: UNPLUG UNIT BEFORE SERVICING.

"COVERS AND PANELS".

2. Disconnect the wire leads at the component to be replaced.

3. Rem ove 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

BLOWER AND/OR BLOWER

MOTOR

WARNING

1. Rem ove racks and the r ight rack support.

2. Rem ove baffle panel by lifting up and out.

3. For gas ovens only, remove the heat exchanger

: UNPLUG UNIT BEFORE SERVICING.

as outlined under “HEAT EXCHANGER”.

8. Disconnect the wire leads to the motor. A. P1 (purpl e) to wire# 11

B. Orange (Low speed) to wire# 12 C. Blue (high speed) to wire# 13 D. Red wires connected together.

9. Rem ove the bolt s that secure the motor to the motor mounting plate and remove the motor from the ov en.

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 motor mounting plate as outlined under "BLOW ER A DJUST MENT " i n "SERV ICE PROCEDURES AND ADJUSTMENTS”. If the motor is to be replaced, c ontinue to step 7.

10. Place new motor in position on the motor mounti ng plat e and rout e the wir ing t hrough t he gromm et in the component panel.

11. Install mounting pads and bolts. DO NOT tighten mounti ng bolts.

12. Slide the blower onto motor shaft until hub is flush wit h end of shaft and tighten set screws.

13. Adjust m otor position u nti l blower is parall el to oven cavity wall with a spacing of ¼" as outlined under "BLOWER ADJUSTMENT " i n "S ERVI CE PROCEDURES AND ADJUSTMENTS".

14. Install baffle panel, rack guides and racks.

7. Rem ove the right side panel.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

OVEN DOOR

Removal WARNING:

1. Remove the top front cover as outlined under "COVERS AND PANELS".

2. Remove the door switch lever from the door shaft.

3. Rem ove the door switc h br ac k et.

4. Whil e supporti ng the door, rem ove the beari n g, door plate and spacer.

UNPLUG UNIT BEFORE SERVICING.

Disassembly

1. Open t he door .

2. Rem ove the door handle and latch plate.

3. Rem ov e t he screws which secure the i nner and outer door panels to the door frame.

4. Rem ove the inner and outer door panel.

5. Remove the four screws and lift the window assembly out.

5. Lift the door from the lower bearing.

6. Reverse procedure to i nstall door assembly and check for proper adjustment as outli ned under "DOOR ADJUST MENT" and "DOOR S WITCH ADJUSTMENT" in "SERVICE PROCEDURES AND ADJUSTMENTS".

NOTE:

the window and the door panel.

6. Reverse the procedure to install the new window and adjust the door as outlined under “DOOR ADJUSTMENT”.

Use high temperature silicone between

WARNING:

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

DOOR SWITCH

HEAT EXCHANGER (GAS

UNPLUG UNIT BEFORE SERVICING.

OVENS)

1. Rem ove the t op front cover as outlined under "COVERS AND PANELS".

2. Disconnect the leads to the door switc h.

3. Rem ove the switch whic h is secured by two screws.

4. Reverse the procedure to install t he new switch.

5. Adj ust the door switch as outlined under "DOOR SWITCH ADJUSTMENT" in "SERVICE PROCEDURES AND ADJUSTMENTS".

WARNING: WARNING:

SERVICING THE UNIT.

1. Rem ove racks and the r ight rack support.

2. Rem ove baffle panel by lifting up and out.

3. Rem ove the screws that secure the heat exchanger and remove it fr om the oven.

UNPLUG UNIT BEFORE SERVICING. SHUT OFF THE GAS BEFORE

4. Reverse procedure to i nstall.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

BURNER (GAS OVENS)

WARNING: WARNING:

SERVICING THE UNIT.

1. Rem ove racks and the r ight rack support.

2. Rem ove baffle panel by lifting up and out.

3. Rem ove the right side panel as outlined under “COVERS AND PANELS”.

4. Disconnect the lead wires to the electrode assembly.

5. Rem ove the heat exchanger as outlined under “HEAT EXCHANGER”.

6. Rem ove the screws from the burner brack et and pull the bur ner into the oven cavity.

7. Rem ove the screws that secure the electrodes to the burner brac k et.

UNPLUG UNIT BEFORE SERVICING. SHUT OFF THE GAS BEFORE

GAS VALVE (GAS OVENS)

WARNING: WARNING:

SERVICING THE UNIT.

WARNING:

DURING SERVI CING MUST BE CHECK E D FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME.

A. CHECK ALL JOINTS PRIOR TO THE

B. CHECK ALL JOINTS BEYOND GAS

1. Rem ove 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.

UNPLUG UNIT BEFORE SERVICING. SHUT OFF THE GAS BEFORE

ALL GAS JOINTS DISTURBED

GAS VALVE BEFORE LIGHTING UNIT.

VALVE AFTER UNIT IS LIT.

8. Reverse procedure to i nstall.

NOTE:

positioned toward t he front of the oven.

When installed, the electrodes are

4. Rem ove the gas valve from the nipple between the it and t he manual gas valve.

5. Reverse procedure to i nstall.

6. Adj ust the gas valve as outlined under “GAS PRESSURE ADJUSTMENT”.

HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

HEATING ELEMENTS

(ELECTRIC OVE NS)

WARNING:

POWER TO T HE MACHINE AT THE MAIN CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

1. Rem ove racks and the r ight rack support.

2. Rem ove baffle panel by lifting up and out.

3. Rem ove the right side panel as outlined under “COVERS AND PANELS”.

4. Disconnect the lead wires to the heating elements.

5. Rem ove the screws from the clamps that secure the heating element assembly.

DISCONNECT THE ELECTRICAL

TEMPERATURE PROBE

Procedure WARNING

1. Rem ove the control panel as outlined under

2. Disconnect the probe leads at the temperature

3. Rem ove probe from the pr obe guar d and push

NOTE:

the probe should be insert ed into the probe guard.

: UNPLUG UNIT BEFORE SERVICING.

"COVERS AND PANELS".

control.

it thru the oven wall into the control panel ar ea.

When installing, only the metal surface of

6. Pul l the top of the heating element assembl y into the oven cavity until the ends of the element s are inside the oven cav ity. Li ft up and remove the lower clamp f r om between the side wall and the bottom of the oven cavity.

NOTE:

angle. The hole in the inside oven cavit y wal l may not line up straight with t he oven cavity outer shell.

4. Reverse the procedure to install t he new probe.

5. Adj ust the temperat ur e c ontrol as outlined

The probe may have to be inserted at an

under "TEMPER A TURE CONTROL CALIBRATI ON" in "SERVICE PROCEDURES AND ADJUSTMENTS".

7. Rem ove the clamps fr om the heati ng element assembly and repl ac e the element ( s).

8. Reverse procedure to i nstall.

HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

WARNING:

MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POI NT S ARE NOT EASI LY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST .

WARNING:

1. Rem ove the right side panel as outlined under "COVERS AND PANELS".

2. Rem ove the probe lead wires from the electronic control .

3. Test t he pr obe with an ohmmeter.

TEMPERA-

TURE

CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR

TEMPERATURE PROBE

TEST (ALL MODELS)

UNPLUG UNIT BEFORE SERVICING.

RESISTANCE

in  ±10%

in (F

77 90000 240 4077 260 3016

VERIFICATION OF SPARK

AT SPARK PROBE

WARNING: WARNING:

SERVICING THE UNIT.

1. Rem ove the right side panel and control panel as outlined under “COVERS AND PANELS”.

2. Disconnect the high voltage lead from the electrode.

WARNING:

YOUR HANDS FO R THIS TEST. THE MANUAL GAS VALVE MUST BE CLOSED.

3. Clamp the wire in such a manner that the end of the wire is 3/16" fr om the f r ame of t he oven.

NOTE:

from the ov en or spark ing may not oc c ur even though the probe ci rcuits are functioni ng pr oper ly.

UNPLUG UNIT BEFORE SERVICING. SHUT OFF THE GAS BEFORE

DO NOT HOLD THE W IRE WITH

It is critical that the wire be held 3/16" away

280 2266 300 1726 320 1332 340 1041 360 822 380 656 400 529 425 424 450 334 475 266

WARNING:

POW E R TO BE APPLIED TO THE UNI T DURING THE TEST. USE EXTREME CAUTION AT ALL TIMES.

4. Pl ug the unit in and set the temperat ur e controller to the maximum setting.

5. Turn the power switch on.

6. Sparking should occur after a 15 second purge tim e. Arcing from the lead wire to the oven frame should be observed at this time.

THE FOLLOWI NG ST EPS REQUIRE

HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

GAS PRESSURE

ADJUSTMENT

WARNING: WARNING:

SERVICING THE UNIT.

1. Rem ove the right side panel and control panel as outlined under “COVERS AND PANELS”.

2. Rem ove the plug from the test port and install the manometer.

WARNING:

POW E R TO BE APPLIED TO THE UNI T DURING THE TEST. USE EXTREME CAUTION AT ALL TIMES.

3. Pl ug in the unit and turn on the gas.

4. Set the temperat ur e c ontrol to the highest setting and turn the power switch on. The burner must be lit while adjusting the pressure.

5. Turn the adjustment screw to obt ain the proper gas pressure.

UNPLUG UNIT BEFORE SERVICING.

SHUT OFF THE GAS BEFORE

THE FOLLOWI NG ST EPS REQUIRE

GAS TYPE SETTING AT OUTPUT

OF GAS VALVE Natural 3.5 inches W.C. Propane 10 inches W.C.

NOTE:

10.5 (Propane) inches W. C., the desired output cannot be obtained and the oven will overate at a lower BTU.

If input pressure is below 4.0 (Natural) or

SPARK IGNITION CONTROL

TEST

WARNING: NOTE:

to the oven ground.

No Gas Ignition & No Sparking

1. Rem ove the right side panel as outlined under “COVERS AND PANELS”.

2. Pl ug in the unit and set the temperat ur e controller to 350°.

3. Turn the power switch on.

UNPLUG UNIT BEFORE SERVICING.

Verify that the ground terminal is connected

• Turn screw clockwise

• Turn screw countercloc k wise

pressure.

to increase pressure.

to decrease

4. Check for 24 VAC between the power terminal and ground terminal.

A. If 24 V A C is present, replace t he spark

ignition control.

B. If 24 V A C is not present, check t he

transformer, temperature contr oller, and switches.

No gas ignition - sparking occurs

1. Rem ove the right side panel as outlined under “COVERS AND PANELS”.

2. Pl ug in the unit and set the temperat ur e controller to 350°.

3. Turn the power switch on.

4. Check for 24 VAC between the gas valve terminal and the ground terminal. The voltage should be present after and during the 10 second i gnition period.

A. If 24 V A C is present, check the gas valve

and gas supply.

B. If 24 V A C is not present, replac e the spark

ignition control.

the 15 second purge

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