Vulcan-Hart VCE6H 126177, VCE10F 126179, VCE20F 126173, VCE10H 126178, VCE20H 126172 User Manual

SERVICE MANUAL

ELECTRIC

COMBI

OVENS

MODEL ML

VCE6H 126177 VCE10H 126178 VCE10F 126179

VCE10F SHOWN ON STAND

This Manual is prepared for th e use of trained Vulcan Service Technicians and should not be used by those not properly qu alif ied. If yo u have attend ed a Vulcan 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 atte nded a Vulca n 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 tools, instruments and skills should be performed b y a trained Vu lcan Service Technician .

VCE20H 126172 VCE20F 126173

- 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 24659 ( S eptember 1999)

ELECTRIC COMBI OVENS

TABLE OF CONTENTS

GENERAL............................................................................. 4

Introduction ........................................................................ 4

Operation.......................................................................... 4

Cleaning .......................................................................... 4

Stacking Kit Instructions............................................................... 4

Specifications ...................................................................... 4

Water Supply ................................................................... 4

Electrical ...................................................................... 5

Oven Controls ...................................................................... 6

Water Conditi oning .................................................................. 7

Lubrication ......................................................................... 7

Tools ............................................................................. 7

REMOVAL AND REPLACEMENT OF PARTS ................................................. 8

Rack Guide/ Filter /Exhaust Assembly ..................................................... 8

Covers and Panels ................................................................... 8

Oven Temperature Probe ............................................................. 9

Programable Oven Control ........................................................... 10

Manual Oven Control s ............................................................... 11

Relay Board....................................................................... 11

Blower and Motor ................................................................... 12

Blower Motor Shaft Seal ............................................................. 13

Heating Elements .................................................................. 13

Thermal Fuse(s) ................................................................... 14

Steam G ener ator Drain Pump ......................................................... 15

Vent Damper Assembly .............................................................. 15

Water Level Sensors and Wat er Equalization Tube ......................................... 16

Steam G ener ator Tank .............................................................. 17

Oven Door........................................................................ 18

Door Lamp........................................................................ 19

Ov en Door Hinges .................................................................. 19

Door Magnetic Reed Switch ........................................................... 20

Door Seal......................................................................... 20

Door Locking Mec hanism ............................................................. 20

Oven Cavity Seal................................................................... 21

Power Supply Board and T r ansformer ................................................... 22

Contactors ........................................................................ 22

Oven Cavity Drain .................................................................. 23

SERVICE PROCEDURES AND ADJUSTMENTS .............................................. 24

Configur ation Mode - Progr amable Control ............................................... 24

Diagnostic Test Mode - Program able Control .............................................. 25

Configur ation Mode - Manual Controls ................................................... 26

Diagnostic Test Mode - Manual Contr ols ................................................. 28

Service Error Lights................................................................. 29

Heating Elements .................................................................. 30

Oven Door Adjustment............................................................... 30

Buzzer Adjustment - Programable Control ................................................ 32

Buzzer Adjustment - Manual Controls ................................................... 32

Clean Cycle Mode - Steam G enerator Deli ming ............................................ 33

Battery Backup - Programable Control................................................... 35

Page 2 of 68

ELECTRIC COMBI OVENS

ELECTRICAL OPERATION .............................................................. 37

Component Func tion ................................................................ 37

Component Locat ion ................................................................ 40

Sequence of O per ation .............................................................. 42

Heating Mode and Cavity Fan Speeds ............................................... 42

Heating Regulation .............................................................. 42

Steam Pre-Heat ................................................................ 43

Steam Regulation ............................................................... 43

Water Injection (Humidifier) ....................................................... 44

Cool Down Mode (Manual Cont r ols) ................................................. 44

Programable Oven Control........................................................ 45

Manual Oven Control s ........................................................... 49

Wiring Diagrams ................................................................... 54

6 Level ....................................................................... 54

10 Level ...................................................................... 56

20 Level ...................................................................... 58

Electric Heater Circuits .............................................................. 60

TROUBLESHOOTING .................................................................. 63

Page 3 of 68

ELECTRIC COMBI OVENS - GENERAL

GENERAL

INTRODUCTION

General

The procedures in t his manual appl y to all models unless otherwise specified. All of the information, illustrations and specifications contained in thi s manual are based on t he latest product information available at the tim e of print ing.

Combi Ovens

The Elect ric Combi ovens provide convection heat, steam heat or a c ombination of both in a single compartment cooking chamber. Humidificat ion is provided from the inter nal steam generat or or by water injection into the oven cavit y. W hen the water is injec ted by means of an internal spray nozz le, it vaporizes on contact wit h the hot interior surfaces.

The ov ens are available in two depths, (half on 6 and 20H/F).

level only) and in three sizes (6H, 10H/F

alf and Full

OPERATION

Refer to the Installation & Operat ion Manual for specific operating instructions.

STACKING KIT INSTRUCTIONS

When servicing stacked ovens and disassembly is required, r efer to the S tacking Ki t Instructi ons for specific assembly procedur es.

SPECIFICATIONS

Water Supply

The fact that a water supply is potable is no guarantee that it is suitable for steam generation. The supply connect ion to the steam gener ator should be “treated” water and must be within t he guideli nes listed below. For dr ain water cooling only, an “untreated“ water suppl y c onnec tion should be used.

Supply Pressure (treated and untreated water)

Supply Connections (treated and untreated water)

Water Hardness * Chloride less than 30 ppm

PH fact or (range) 7 to 8

(*17.1 ppm = 1 grain of har dness)

20-80 psig

cold

2-4 grains per

gallon (gpg)

CLEANING

Refer to the Installation & Operat ion Manual for specific cleani ng instructions.

Page 4 of 68

Electrical

ELECTRIC COMBI OVENS - GENERAL

MACHINE AMPERAGE (3 PHASE/ 60HZ)

MODEL

VCE6H

VCE10H

VCE10F

VCE20H

VCE20F NOTES:

POWER

(KW)

PER LINE

RECOMMENDED

CIRCUIT

PROTECTION

208V 240V 480V 208V 240V 480V

9 252211353015

18 50 43 22 70 60 30

24 67 58 29 90 80 40

36 100 87 43 125 110 60

1. Amperage values in t he table are nominal. T olerance is +5/-10%.

2. Line currents must

be measured in full power

convec tion heat m ode.

3. Complied in accordance with National Electric Code, ANSI/NFPA 70, latest edition.

MODEL

VCE6H

VCE10H

VCE10F

VCE20H

VCE20F

NOTES:

INDIVIDUAL AMPERAGE (3 PHASE/ 60HZ)

CONVECT ION HEAT

ELEMENTS

208V 240V 480V

STEAM GENE RATOR HEAT

ELEMENTS

208V 240V 480V

KW NO. KW NO.

9 1 25 22 11 8 1 22 19 10

9 2 50 43 22 8 2 45 39 19

6 4 67 58 29 8 3 67 58 29

9 4 100 87 43 8 4 89 77 39

1. Amperage values in the table are nomi nal. Tolerance is +5/-10%.

2. Convection heater currents must

be measured in full power convection

heat mode.

3. Steam generator heater currents m ust

be measured in full power steam

mode.

Page 5 of 68

ELECTRIC COMBI OVENS - GENERAL

OVEN CONTROLS

PROGRAMMABLE STANDARD MANUALDELUXE MANUAL

Page 6 of 68

ELECTRIC COMBI OVENS - GENERAL

WATER CONDITIONING

Furnishing the steam generator with treated water to reduce scale formation is impor tant. Scal e formation will reduce steam out put, cause prematur e component failur e, and shorten equipm ent life. Most water supplies contai n scale producing m inerals such as Calcium and M agnesi um. As steam is generated, the minerals remain and dissolve int o the water. As the concentration of these miner als increases past a certai n point, they pr ec ipitate from the water and coat the inside of t he steam generator, heating elements, and water level sensors. Because of the high temperature of these surfaces, the pr ec ipitated mineral s bake ont o them and become very difficult to r emov e.

This may c ause several probl ems:

1. Reduced heat transf er eff iciency.

2. Premature heating element failures.

3. False readings from water l evel sensors. These problem s are common to any manufacturer's

steamer regardless of design, but t hey c an all be minimized by furnishing the steam generat or with treated water.

Other factors affecting steam generati on ar e iron content, amount of c hloridation and dissolved gases.

The desired water propert ies can best be achieved by using a

system.

The water level probes in the steam generator use ions in the water t o detect the water level.

use fully demineralized or de-ionized water since it is "non conductive" and the water level can not be detected.

properly maintained water treatment

Do not

LUBRICATION

Cavity fan motor has sealed beari ngs and



requires no addit ional lubrication. Cavity fan motor shaft seal requires lubr ication



at replacement (White silicone grease 544268).

TOOLS

Standard

Standard set of hand tools.



Metric set of hand tools.



VOM with AC c ur r ent tester (any quality VOM



with a sensitivit y of at least 20,000 ohms can be used).

Gear puller to remove cavity fan.



Temperat ure meter wit h thermocoupl e.



Special

Red High Tem perature RTV for door seal and



probes (P/N 544313 or 542949). Grounding kit to protec t control board( s) if



handled (P/N TL-84919). Motor Shaft Centering Tool (P/N 359450) .



28 pin EPROM extraction tool and 28 pi n



EPROM i nsert ion tool (purc hase l oc ally). Scalekleen deliming chemical or the



recommended chemi c al for t he water treatment system in use for deliming of the steam generator. (S c alekleen is avail able through the Serv ice Parts Distr ibution Center or locally through an Everpure dealer)

The use of strainers, or filters will not remove minerals from the water.

Water supplies vary fr om state to state and from locati ons wit hin a state. Therefore, Vulcan recommends that a local water treatm ent specialist be consulted bef ore the installation of any steam generating equi pment.

Steamers that operate over a long peri od of time without the benefit of a water treatment system, which have developed a heavy scale build up, should be cleaned before using the system.

Page 7 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

REMOVAL AND REPLACEMENT OF PARTS

RACK GUIDE/FILTER/EXHAUST

ASSEMBLY

1. Turn the oven off.

2. Remove the racks (i f equipped).

3. Push the rack guide to rear of oven to remove the rack guide tabs from sl ots in the exhaust assembly (10 level).

4. Lift the rear of the rack guide up and pull the guide out of the ov en c avity.

5. Lift the filter up, then pull forward to remove the filter (2 filter s on 20 level).

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.

6. Lift up on exhaust assembly then pull forward at bottom to clear t he dowel pins.

7. After lower dowel pins have been c leared, remove assembly from t op pins and remove from oven.

DISCONNECT THE ELECTRICAL

COVERS AND PANELS

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.

Side Panels

1. Remove the screws from the side panel f or the side in need of access. Hold the panel in place before removing the last screw.

2. Access the inside edge of the panel at the bottom r ear corner and disconnect the ground wire (if present).

DISCONNECT THE ELECTRICAL

8. Reverse proc edur e to install .

NOTE:

is seated on the dowel pins and fan direction arrow is pointing to lef t (facing oven).

Be sure the bottom of the exhaust assembly

3. Remove the panel.

NOTE:

ensure the gasket at the rear of the contr ol panel seals properly agai nst the front edge of the ri ght side panel.

4. Reverse proc edur e to install .

When r e-install ing the right si de panel,

Page 8 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

Rear Panel

1. Remove the screws from the rear ov en panel. Hold the panel in place before removing the last panel screw.

2. Access the inside edge of the panel at the bottom left and disconnect the ground wire ( if present).

3. Lower the panel to remove from oven.

4. Reverse proc edur e to install .

OVEN TEMPERATURE PROBE

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. Remove the rack gui de, filter and exhaust assembly as outlined under “RACK GUIDE/ FILTER/EXHAUST ASSEMBLY”.

2. Remove both side panels as outl ined under “COVERS AND PANELS”.

3. Remove the retai ning nut fr om the probe inside the ov en ( 2 probes on 20 level) and lift bracket off.

DISCONNECT THE ELECTRICAL

Control Panel

1. Remove the right side panel as outli ned.

2. Disconnect the r ibbon cable, t her mocouple connector, gr ound leads and door switch connector from the oven control board.

3. Remove the nuts at the t op and bottom of control panel that secure it to the f r ame.

CAUTION

damage may result to the oven control if dr opped.

4. Reverse proc edur e to install .

: Hold contr ol panel duri ng r emov al or

4. Remove probe(s) through the left si de of the oven cavity.

NOTE:

silicone between the probe and the hole in the oven cavity wall.

NOTE:

position as shown.

5. Disconnect the pr obe leads from the control

6. Reverse proc edur e to install .

NOTE

rotate unless secured. Do not or damage m ay result.

When r eplacing, use hi gh temperature

Be sure to replace br ac k et around probe and

board connector.

: When tightening retaini ng nut, probe will

clamp down on probe

Page 9 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

PROGRAMABLE OVEN

CONTROL

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.

CAUTION: Certain components in this system are subject to damage by electrostatic discharge during field repairs. A field service ground kit is available t o prevent damage. Th e f ield service grounding kit must be used anytime the control board is handled.

1. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Disconnect the r ibbon cable, connec tors and ground leads fr om the oven control boar d.

DISCONNECT THE ELECTRICAL

4. Remove the hex nut s securi ng the CPU board to the display/keypad board.

5. Pull out wards on the CPU boar d and lif t it off from the display/keypad board pin connections.

3. Remove the cover from the oven control by removing the mounting nuts at the top and bottom.

NOTE:

keypad board, make sure that the pi ns on the keypad board are aligned with the plug on the control boar d.

Page 10 of 68

When installing the control board onto the

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

6. Remove the display/keypad board from the control panel by removing the mounting nuts.

4. Remove the oven control board from the control panel by removing the mounting nuts.

7. Reverse proc edur e to install .

MANUAL OVEN CONTROL S

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. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Disconnect the r ibbon cable, t her mocouple connector, gr ound leads and door switch connector from the oven control board.

3. Remove the cover from the oven control boar d by removing the mounting nut s at the top and bottom.

DISCONNECT THE ELECTRICAL

5. Reverse proc edur e to install .

RELAY BOARD

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. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Disconnect lead wi r es from the r elay board.

DISCONNECT THE ELECTRICAL

Page 11 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

3. Release the clips on the back of the mounti ng rail.

4. Reverse proc edur e to install .

NOTE:

the procedure at this point to install.

5. Remove the rear panel as outlined under

6. Disconnect the lead wires from the motor .

7. Remove the mot or from the back of t he oven

If only the blower is bei ng r emov ed, rever se

“COVERS AND PANELS”.

by removing the mounting nut s.

BLOWER AND MOTOR

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.

Removal

1. Remove the rack gui de, filter and exhaust assembly as outlined under “RACK GUIDE/ FILTER/EXHAUST ASSEMBLY”.

2. Loosen bolt (one turn) that secures the blower and install puller.

3. Tighten t he puller, then tap the puller with a hammer to loosen the blower from the motor shaft.

4. Remove the pull er , bolt, washer and blower from the motor shaft.

DISCONNECT THE ELECTRICAL

8. Remove the cover plate and seal from inside the ov en c avity.

NOTE:

back of t he oven.

Page 12 of 68

You may have to dri ve the seal out from the

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

Installation

1. Mount the m otor to the back of the oven. Tighten t he bolts enough to hold the motor i n place, but allow some movem ent.

2. Ensure that the motor shaft is centered (use shaft center ing tool) in the mot or shaft hole and tighten mounting bol ts.

3. Remove the shaft c entering tool .

4. Connect the lead wi r es to the motor.

5. Install seal and cover as outlined under “BLOWER MOTO R SHAFT SEAL”.

: Remove all traces of m otor seal grease from

NOTE

the motor shaft.

6. Install the blower wheel.

7. Install exhaust assembly, fil ter, and rack gui de as outlined under “RACK GUIDE/FILTER/EXHAUST ASSEMBLY”.

8. Install rear panel as outlined under “COVERS AND PANELS”.

BLOWER MOTOR SHA FT SEAL

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.

DISCONNECT THE ELECTRICAL

: Remove all traces of m otor seal grease from

NOTE

the motor shaft.

7. Install the seal cover plate and then the blower.

HEATING ELEMENTS

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.

Oven Cavity

1. Remove the rack gui de, filter and exhaust assembly as outlined under “RACK GUIDE/ FILTER/EXHAUST ASSEMBLY”.

2. From inside the oven cavity, remove the nuts from the heating element stand-offs for the element being replaced.

3. Remove the rear panel as outlined under “COVERS AND PANELS”.

4. Disconnect the lead wires from the elem ents at the rear of the oven.

5. Remove the nuts and washers from the element being replaced t hen r emov e the element.

DISCONNECT THE ELECTRICAL

1. Remove blower as outli ned under “BLOWER AND MOTOR”.

2. Remove motor seal c over pl ate.

3. Remove the seal f r om the recess in the r ear oven wall.

NOTE:

back of t he oven.

4. Fill replacement seal cover with white silicone

5. Assemble the motor seal with t he c onvex par t

6. Apply red high temperat ur e RTV to the outer

You may have to dri ve the seal out from the

grease.

of the spri ng toward the motor.

edge of the seal to help hold i t in the recess and install the seal with the seal c over toward the front of the oven cavity.

6. Reverse proc edur e to install .

Page 13 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

Steam Generato r

1. Turn off the water supply to the steam generator.

2. Remove the right side panel as outli ned under “COVERS AND PANELS”.

3. Remove the thermal fuse and prot ective sleev e from the heater thermowell.

2. Disconnect the t hermal fuse(s) lead wire connections.

3. Remove the thermal fuse and prot ec tive sleeve from the heater thermowell.

4. Disconnect the heating element lead wire connections.

5. Remove the heating element from t he steam generator by removing the mounting nuts.

NOTE:

supplied gasket and ensure the mating surfaces are clean.

6. Reverse proc edur e to install .

When installing a new heater, use the

THERMAL FUSE(S)

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. Remove the right side panel as outli ned under “COVERS AND PANELS”.

DISCONNECT THE ELECTRICAL

4. Reverse proc edur e to install . : When replacing thermal fuse, be sure to

NOTE

insert the protective sleeve and thermal fuse together. T he protective sleeve must into the heat er thermowell with the fuse to avoid chafi ng of the fuse leads.

: When replacing thermal fuse do

NOTE

lead wires apart. This may break the contact juncti on or damage the connections.

be inserted

pull the

not

Page 14 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

STEAM GENERATOR DRAIN

PUMP

1. Turn off the oven and allow the steam generator to drain.

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.

2. Turn off the water supply.

3. Remove the right side panel as outli ned under “COVERS AND PANELS”.

4. Disconnect l ead wir es and hoses connected to the drain pump.

5. Remove the bolts from the mounting brac ket that secure the pump.

DISCONNECT THE ELECTRICAL

VENT DAMPER ASSEMBLY

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.

DISCONNECT THE ELECTRICAL

VENT DAMPER ASSEMBLY DIAGRAM

6. Reverse proc edur e to install .

Vent Motor

1. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Disconnect the lead wires from the switch and motor.

3. Remove the screw and nut behind the motor assembly that c onnec ts motor to shaft extension rod.

4. Remove the mot or and swit c h assembly from the ov en by sliding the mounting brac k et out from the ov en frame.

5. Reverse proc edur e to install .

Page 15 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

Sealing Washer

1. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Open the oven door and remove the rack guide, filter and exhaust assembly as outlined under “RACK GUIDE/FILTER/EXHAUST ASSEMBLY”.

WARNING:

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

3. Reconnect the el ectrical power to the machine at the main circuit box.

4. Close the door, turn the oven ON and press the Start/S top button.

5. Observe the rotation of the vent motor cam. When the cam stops turning then the vent should be closed.

NOTE

opened, the vent should open automatical ly.

6. Disconnect the electric al power to the machine at the main circuit box. P lace a tag on the circuit box indicating the circui t is being serviced.

NOTE

manner. I f the oven is turned OFF or the door is opened, the vent will re-open automatical ly.

7. Open the oven door and examine the vent f r om inside the cavit y.

A. If the mounting nut is vi si ble, proceed to

B. If the mounting nut is not visible, t hen the

8. Remove the nut securing both shutters and the sealing washer to the shaft extension rod then remove the shutters and sealing washer.

THE FOLLOWI NG ST EPS REQUIRE

: When the ov en is turned OFF or the door is

: Power to the oven must be removed in this

step 8.

vent needs to r otate 180 degrees. Reconnect power to the machine and repeat steps 3 through 7A.

4. Rotate the extension rod approximately 90 degrees by hand.

5. Exam ine the vent from inside the c avity. A. If the mounting nut is vi si ble, proceed to

step 6.

B. If the mounting nut is not visible, t hen the

extension rod needs t o r otate approximately 90 degrees more.

6. Remove the nut securing both shutters and the sealing washer to the ex tension rod then remove the shutters and sealing washer.

7. Remove the shutter screw f r om the extension rod.

8. Release the snap ring on the left end of the shaft (i f fac ing oven) and pull shaft extension out.

: If the washers on the exterior of the vent

NOTE

housing come loose, red silicone must be re-appli ed to prevent steam l eakage above the oven cavity .

9. Reverse proc edur e to install .

WATER LEVEL SENSORS AND

WATER EQUALIZATION TUBE

1. Turn the oven off and allow steam generator tank to drai n.

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.

2. Turn off the water supply.

3. Remove the right side panel as outli ned under ”COVERS AND PANELS”.

4. Disconnect l ead wir es and hose clamps from the water equali z ation tube.

DISCONNECT THE ELECTRICAL

9. Install new sealing washer and re-assemble.

Shaft Extension

1. Remove the left, ri ght and rear panels as outlined under “COVERS AND PANELS”.

2. Open the oven door and remove the rack guide, filter and exhaust assembly as outlined under “RACK GUIDE/FILTER/EXHAUST ASSEMBLY”.

3. Remove the screw and nut behind the motor assembly that c onnec ts motor to shaft extension rod.

NOTE

Page 16 of 68

: Some water will continue to drain out.

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

5. Remove the water equalization tube.

4. Disconnect water and steam equalizat ion tube from the steam generator. If necessary, loosen or remove drain pump mounting nuts to remove tube.

6. Reverse proc edur e to install .

STEAM GENERAT OR TANK

1. Turn the oven off and allow the steam generator tank to drain.

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.

2. Turn off the water supply to the steam generator

3. Remove the right side and rear panels as outlined under “COVERS AND PANELS”.

DISCONNECT THE ELECTRICAL

10 LEVEL SHOWN

A. Remov e heating elements from steam

generator tank and place to the side.

NOTE

: Unless replacing the heating element (s), it not nec essary to r emov e the heating element lead wir es.

B. On 6 and 10 levels, remove cl amp from

the steam exhaust hose at the top of steam generator and disconnect hose. On 20 levels, remove the nut s securing the steam exhaust pipe to the outsi de of the cavity.

NOTE

: When replacing tank on 20 levels, be sure to seal the m ating surface between the exhaust pipe and cavity wall with RT V .

5. Remove the nuts fr om the tank mounting studs and bracket (at bottom) t hen r emov e the steam generator f rom the oven.

6. Remove insulation from the old steam generator and use on the repl ac ement steam generator.

7. Reverse proc edur e to install .

Page 17 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

OVEN DOOR

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.

Removal

1. Remove the left and right si de panels as outlined under “COVERS AND PANELS”.

2. Disconnect the lead wires to the lamp on the power supply board term inal block and r oute them so they can be pulled through the hole in the frame when the door is rem oved.

3. Support the door, remove the screws from each hinge block on the oven and r emov e door.

DISCONNECT THE ELECTRICAL

4. Open the inner door glass and remove the cring clamps from the rear snap catches, unsnap at the rear then lif t off.

4. Reverse proc edur e to install .

Disassembly

1. Remove the door f r om the oven as outlined above in “REMOVAL”.

2. Lay the door on a f lat surfac e with the inside of the door fac ing up.

3. Lift up along the inner door glass edge near the door latch and unsnap the glass from t he “snap catches” in the oven door.

CAUTION: When replacing the inner door glass, it must be installed with the conductive side toward the front o f t he oven. Use an ohmmeter to verify the conductive side. Set the meter to read ohms and touch glass with the meter leads. A resistance will be measured but will vary depending on the distance between the meter leads, grease and/or o t her substances o n the glass.

5. Remove the bolts securing the top and bottom hinges to the door.

6. Remove the drip t r ay, remaining screws from the inner door panel, the screws at the left, right and bottom of the door and remove the door handle.

7. Lift the inner door panel from the outer door frame.

8. Remove the outer door glass.

9. Reverse proc edur e to install .

10. Adjust the door as outlined under “OVEN DOOR ADJUSTMENT” in “SERVICE PROCEDURES AND ADJUSTMENTS”.

Page 18 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

DOOR LAMP

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. Remove the screws holding the cover and gasket.

DISCONNECT THE ELECTRICAL

OVEN DOOR HINGES

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. Remove and disassemble the door as outlined under “OVEN DOOR”.

2. Remove the li ght lead wire from the hinge.

NOTE:

wires at the terminal end t o allow the terminals to be fed through the hinge one at a time.

DISCONNECT THE ELECTRICAL

Strip 3 inches of the shielding away from the

2. Pull t he lamp and socket assembly out f r om the door.

3. Hold the lamp assembly and grasp the bulb using a cloth.

NOTE

: Do not touch t he Halogen lamp with bare hands. If lamp is ex posed t o oil f r om the skin, the life will be reduced. Ensure lamp is free from oil and dirt before replacing.

3. Remove the cotter pins from the shaft and remove the shaft from the hinges.

4. Pull up on light bulb to remove it from socket.

5. Reverse proc edur e to install .

4. Reverse proc edur e to install .

Page 19 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

DOOR MAGNETIC REED SWITCH

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. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Remove the nuts that secure the door switch mounti ng bracket to the bottom of the control panel. On 20 levels, the switch is m ounted to the underside of the channel f or the door handle (no bracket required).

3. Disconnect the switc h lead wires.

4. Remove the switch f rom the oven.

DISCONNECT THE ELECTRICAL

5. Apply red silicone to the repl ac ement seal and install the seal to the glass edge. The vent holes must be i nstalled to the outside to all ow the seal to contract when the door is closed.

6 AND 10 LEVELS

5. Reverse proc edur e to install and c hec k for proper operati on.

DOOR SEAL

1. Turn the oven off.

2. Open the oven door.

3. Remove seal from the edge of the inside glass.

4. Clean the edge of the glass, rem ove the old adhesive.

6. Adjust door closure, if nec essary, as outlined under “OVEN DOOR AND DOOR LOCK ADJUSTMENT” in “SERVICE PROCEDURES AND ADJUSTMENTS”.

DOOR LOCKING MECHANISM

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.

Replacement

1. Remove the right side panel as outli ned under “COVERS AND PANELS”.

2. Disconnect the lead wires to the motor and switches.

3. Remove the nuts fr om the mounting studs and remove the assembly from the oven.

DISCONNECT THE ELECTRICAL

Page 20 of 68

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

4. Remove the spring and posit ioning plat e from the locking arm.

5. Reverse proc edur e to install and adjust as outlined under “O VEN DOOR ADJUSTMENT” in “SERVICE PROCEDURES AND ADJUSTMENTS”.

Disassembly

1. Remove the three screws that secure the motor and switch assembly.

2. Remove the mot or , gear box and switch assembly from the locking m ec hanism. Remove the two bolts from the locking mechanism. The springs, locking arm and bushings can be removed.

4. The springs, loc k ing arm and bushings can be removed.

5. Reverse proc edur e to install .

OVEN CAVITY SEAL

3. Remove the two bolts from the locking mechanism.

1. Open the door.

2. Pull t he seal from the groove around the ov en cavity.

3. Push the arrow head tip of the gasket int o the groove. Install the four corners first.

4. Start at the corners and work to the m iddle of each side, being c ar eful not to stretch the replacement gasket.

5. Check the door for proper operation and adjust if nec essary, as outlined under “OVEN DOOR AND DOOR LOCK A DJ US TMENT” in “SERVICE PROCEDURES AND ADJUSTMENTS”.

Page 21 of 68

+ 47 hidden pages