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

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Page 1

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)

Page 2

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

Page 3

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

Page 4

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

Page 5

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

Page 6

ELECTRIC COMBI OVENS - GENERAL

OVEN CONTROLS

PROGRAMMABLE STANDARD MANUALDELUXE MANUAL

Page 6 of 68

Page 7

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.

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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

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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

Page 10

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

Page 11

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

Page 12

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

Page 13

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

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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

Page 15

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

Page 16

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.

Page 17

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

Page 18

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

Page 19

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

Page 20

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

Page 21

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

Page 22

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

POWER SUPPLY BOARD

AND TRANSFORMER

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 l ead wir e c onnec tions and ribbon cable f r om the board.

DISCONNECT THE ELECTRICAL

CONTACTORS

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 for the contactor being replaced.

DISCONNECT THE ELECTRICAL

3. Loosen the two nuts securing the assembly to the mounting bracket and lift the assembly off the bracket.

4. Reverse proc edur e to install .

NOTE

: Ensure transf or mer tap wire i s i n the position that corresponds to the machine data plate voltage. Refer to the “power supply board and transformer (1T) “ component on the wiring diagr am for pr oper connection of the individual lead wires.

3. Remove the jumper bars from the contact or s.

4. Pull t he locking tab out at the contactor base to release the catc h and r emov e c ontactor f r om mounti ng bracket.

5. Reverse proc edur e to install .

Page 22 of 68

Page 23

ELECTRIC COMBI OVEN - REMOVAL AND REPLACEMENT OF PARTS

OVEN CAVITY 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.

1. Open the oven cav ity door.

2. Lift up the ov en c avity drain grate to remove.

DISCONNECT THE ELECTRICAL

6. Remove the drain vent pi pe from the drain.

7. Disconnect the dr ain cool down water hose from the drain ni pple extensi on.

8. Unscrew the drain line piping from the bottom of the oven then remove the oven drain.

9. Reverse proc edur e to install .

3. Unscrew t-bar nut to release drain at the front.

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

5. Disconnect the dr ain pump discharge hose from the drain vent pipe.

Page 23 of 68

Page 24

ELECTRIC COMBI 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:

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 rear panel as outlined under “COVERS AND PANELS”.

2. Identify the type of convection fan motor ( s) on the ov en before setti ng the motor values in step 9 and 10.

3. Reverse proc edur e to install .

4. Re-connect power to the oven.

The configuration mode can be entered onl y when the ov en is mode can be done at any time by pressing the key to sav e the confi guration settings and exit t he confi gur ation mode.

To Perf orm:

1. To enter the configurat ion mode press the

TIME, TIME UP

simultaneously for 3 seconds. I n the tim e display, C and F will be displayed. In the temperat ure display, “Conf” will be displayed.

2. Press the

DOWN

indicat es t he temperature scale selected. The control will automatically advance to the next step, approximately three seconds after the selection is made. To manually advance to the next step, pr ess the

3. dSC is displayed in the time display and t he number of clean cycles complet ed (deliming of steam generator ) is displayed in t he temperat ure display.

changed or modified START/STOP

CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR

CONFIGURATION MODE -

PROGRAMABLE CONTROL

DISCONNECT THE ELECTRICAL

OFF

. Returning to the normal operating

TIME DOWN

and

TIME UP

key for Celsius. The blinking letter

key for Fahrenheit or

START/STOP

The number cannot be

. Press the

key to advance to the next step.

keys

key.

OFF

TIME

4. The EPROM r evisi on level is displayed in the tim e display and “Conf” is displayed in the temperat ure display. T o veri fy the EPROM is at the current r evisi on level, ref er to the Technic al Service Bulletins. Press the to adv anc e to the next step.

5. HHH is displayed in the time display and the total cook ing hours of the oven is di spl ay ed in the temper ature display. P r ess the key to increase number of hour s or t he

DOWN

the current number of hour s i s acceptable, press step.

NOTE

not changed withi n 3 seconds, t he c ontrol will automatically advance to the next step wit hout pressing the

6. bbb flashes and is di spl ay ed in the time display, the frequency number is display ed in the temper ature display and t he buz z er shoul d be sounding. Press the

DOWN

continuous and 255 = very slow int er vals) number. A good setting to start with is 050 or any number that is prefer able to the customer. If t he setting is accept able, press the

START/STOP

7. uuu is displayed in the time display and the steam temperature setting is displayed i n the temperat ure display. T he steam temper ature setting is t he boiling point adjustm ent for elevation and m ust results. Press the number or number. Set the temper ature according to the table below. P r ess the advance to the next step.

key to decrease the number of hours. If

START/STOP

: If a c onfigurat ion parameter is selected and

START/STOP

keys to set the buzzer frequency (000 =

TEMP DOWN

START/STOP

TEMP UP

key to advance to the next

key.

TEMP UP

key to advance to the next step.

be set to achieve optimum

TEMP UP

key to decrease

START/STOP

key to increase

key

TEMP

key to

Page 24 of 68

Page 25

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

: The temperature select ed in the table below

NOTE

will also be the highest starting point temperature available, when the steam mode i s selected.

ELEVATION

(FT)

Sea level to 500 212

500 to 1000 211

1,000 to 2,000 209

2,000 to 3,000 207

3,000 to 4,000 205 4,000 to 5,000 204 5,000 to 6,000 202

6,000 to 7,000 200

7,000 to 8,000 198

8,000 to 9,000 196

9,000 to 10,000 195

Above 10,000 194

TEMPERATURE

(°F)

8. CCC is displayed in the time display and the convec tion tem perature li mit is displayed in the temperat ure display. Pr ess the

TEMP UP

key

to increase number (482°F to 518°F) and

TEMP DOWN

key to decrease num ber . Set the

temperat ure to read 518°F. Pre ss the

START/STOP

key to advance to the next step.

9. 1 - - is display ed in the time display and t he minimum

value for the c onvection fan motor is

displayed i n the temperat ur e display. Press the

TEMP UP DOWN

to Position 1 the v alue is correct , press the

key to increase number and

TEMP

key to decrease num ber . Set accordi ng

(minimum) in the table below. If

START/STOP

key to advance to the next step.

10. 2 - - is displayed in the time display and a maximum

value for the c onvection fan motor is

displayed i n the temperat ur e display. Press the

TEMP UP TEMP DOWN

according to Position 2

key to increase number and the

key to decrease num ber . Set

(max imum) in the table

below. If the value is correct, press the

START/STOP

key to advance to the next step.

CONVECTION FAN MOTOR

CONVECTION FAN

MOTOR TYPE

1 motor Leroy-Somer (Hanning)

1 motor Brook-Crompton 2 motors Leroy-So mer

(Hanning) 2 motors Brook-Crompton 30 90 1 motor Leroy-Somer

(Hanning) and 1 motor Brook-Crompton

: (*) Ove n s are shipped from the factory with th is

NOTE

motor and the oven control is configured accordingly. The values correspond to th e current limits only and are not the actual current draw of the motor.

POSITION 1

(MINIMUM)

VALUE

POSITION 2 (MAXIMUM)

855

860

46 120

38 105

11. If all t he values have been entered corr ectly, press the

key to sav e the confi guration

OFF

settings and exit the configuration mode. To review or change a configuration value press the

START/STOP

key to return to step 1.

DIAGNOSTIC TEST MODE -

PROGRAMABLE CONTROL

The test mode can be entered only when the oven is

The five t ests are r un in sequence (1 - 5) and

OFF.

are indicated by the position of the illuminated LED in the bar graph of the com bi mode key.

The test are performed in a fixed sequence of:

1. ROM (automatical ly)

2. RAM (autom atically)

3. Displays and LED’s

4. Relays (relay on for max. of 2 seconds)

5. Keypad

To Perf orm:

1. To enter the t est mode press the

and

TEMP DOWN

keys simul taneously for 3 seconds. The word “test” will be displayed in the temper ature display.

TEMP, TEMP

2. If a RO M or RA M error is detect ed, a error

Page 25 of 68

code (01 = ROM and 02 = RAM) will be displayed on the temperature display and will repeat until a key is pushed to ex it this test. If no errors are detected, the control advances to the next test and runs it automatically.

Page 26

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

3. The DISPLAY and LE D test consists of flashing all di splays and LED’s. The word “test” will flash intermittent ly as the tem per ature display i s tested. Verify all the DI SPLAYS and LED’s a re flashing. This test will continue until a key is pressed to advance to the next step.

4. The RELAY test consi st of selecting a particular relay by its code number (01 to 11) with the

TEMP UP

and

TEMP DOWN

keys. The initial code displayed in the temperature display i s 01 for relay K1. Press the

TEMP

key to energize t he selected relay for a maxim um of 2 seconds. Verify that each selected rel ay (K1 to K10) is functi oning. See tabl e below. To exit this test and proceed to the next, pr ess the

key.

OFF

CODE RELAY COMPONENT

01 K1 door mo tor 02 K2 cavity vent motor

04 K3 cooling fan(s) and door light only 05 K3, K4 water inje ction so lenoid (humidifier) 06 K5 drain pump 07 K3, K5 water fill solenoid

NOTE

engaged. No noticeable external component o p erates.

K6 contactor KM1 (ha lf power, full speed)

K10

: Asterisk (*) indicates relay is checked but contactor not

contactor KM2 (half power, ha lf speed); on 20 levels only, contactor KM3 and drain cool do wn solenoid.

contactor KM3 and drain cool down solenoid on 6 & 10 levels; contactor KM5 on 20 levels only (steam generator heating elements)

contactor KM7 (convection heating elements)

contactor KM6 (convection heating elements)

5. The keypad test consi st of pressing each key to check its functionality. Initially, 02 is displayed in the time display and “test” is displayed in the temperat ure display. With each successful key press, the number of the key i s di spl ay ed in the time display. Each key is number ed, starting wit h number 01 (ON) in the upper left corner of the control and ends at 21 (humidifi er) on the lower right corner. See table below. Verify that all keypad buttons are functioning properly.

KEY NO. KEY NO.

ON 01 TEMP 12 OFF 02 TEMP DOWN 13 HOT AIR 03 TEMP UP 14 STEAM 04 DELTA T 15 COMBI 05 PROG 16 START/STOP 06 ENTER 17 PHASE 07 ENTER DOWN 18 TIME 08 ENTER UP 19 TIME DOWN 09 FAN SPEED 20 TIME UP 10 HUMIDIFIER 21 PROBE 11

6. To exi t the diagnosti c test mode, press and hold the

key for approximately 3 seconds.

OFF

CONFIGURATION MODE -

MANUAL 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 rear panel as outlined under “COVERS AND PANELS”.

2. Identify the type of convection fan motor ( s) on the ov en before setti ng the motor values in step 9 and 10.

3. Reverse proc edur e to install .

4. Re-connect power to the oven.

The configuration mode can be entered onl y when the ov en is mode can be done at any time by pressing the

START

exit the confi gur ation mode.

To Perf orm:

1. To enter the configurat ion mode press the

TIME

seconds. In the temperature display , “Conf” will be displayed. P r ess the to the next step.

2. C and F will be displayed in the time display. Rotate the adj ustment knob counterclockwise for Cel sius and clockwise for Fahrenheit. The blinking letter indicates the temperature scale selected. Ac c ept the selecti on by pr essing t he

TIME

DISCONNECT THE ELECTRICAL

. Returning to the normal operating

OFF

key to sav e the confi guration settings and

and

TEMP

keys simul taneously for 3

key to advance

TIME

key to advance to the next step.

Page 26 of 68

Page 27

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

3. dSCL is displayed in the time display and t he number of clean cycles complet ed (deliming of steam generator ) is displayed in t he temperat ure display.

changed or modified

The number cannot be

. Press the

TIME

key to

advance to the next step.

4. The EPROM r evisi on level is displayed in the tim e display and “Conf” is displayed in the temperat ure display. T o veri fy the EPROM is at the current r evisi on level, ref er to the latest Technical Service Bulletins

. Press the

TIME

key to advance to the next step.

5. HHHH is displayed i n the tim e display and the total cook ing hours of the oven is di spl ay ed in the temper ature display. Rotate the adjustment knob counterclockwise hours and clockwise

to decrease number of

to increase number of hours. If the current number of hours is acceptable, press the

key to advance to

TIME

the next step.

6. bbbb flashes and is di spl ay ed in the

TIME

display, the frequency number is display ed in the temper ature display and t he buz z er shoul d be sounding. Rotate t he adjustment k nob counterclockwise and clockwise

to decrease buzzer frequency

to increase buzzer frequency (000 = continuous and 255 = very slow intervals) number. A good setti ng to start with is 050 or any number that is pref er able to the customer. If the sett ing is acceptabl e, press the

key to advance to the next step.

TIME

7. uuuu is displayed in the time display and the steam temperature setting is displayed i n the temperat ure display. T he steam temper ature setting is t he boiling point adjustm ent for elevation and m ust

be set to achieve optimum results. Rotat e the adjustment k nob counterclockwise

to decrease and clock wise to increase. Set the temperat ur e ac c or ding to the table below. P r ess the

key to advance to

TIME

the next step.

: The steam temperatur e setting

NOTE

will also be the initial cavit y set point tem per ature and the maximum c avity temperature that can be set, when the steam mode is selected.

ELEVATION

(FT)

Sea level to 500 212

500 to 1000 211

1,000 to 2,000 209

2,000 to 3,000 207

3,000 to 4,000 205 4,000 to 5,000 204 5,000 to 6,000 202

6,000 to 7,000 200

7,000 to 8,000 198

8,000 to 9,000 196

9,000 to 10,000 195

Above 10,000 194

TEMPERATURE

(°F)

8. CCCC is displayed i n the tim e display and the convec tion tem perature li mit is displayed in the temperat ure display. Rot ate the adjustm ent knob counterclockwise 518°F) and cloc k wise the temper ature to read 518°F. P r ess the

to decrease (482°F to

to increase number. Set

TIME

key to advance to the next step.

9. 1 - - is display ed in the time display and t he minimum

value for the c onvection fan motor is displayed i n the temperat ur e display. Rotat e the adjustm ent knob counterclockwise decrease and clockwise Set according to Position 1

to increase number.

(minimum) in the

table below. If the value i s cor r ec t, press the

key to advance to the next step.

TIME

10. 2 - - is displayed in the time display and a maximum

value for the c onvection fan motor is displayed i n the temperat ur e display. Rotat e the adjustm ent knob counterclockwise decrease and clockwise Set according to Position 2

to increase number.

(max imum) in the

table below. If the value i s cor r ec t, press the

key to advance to the next step.

TIME

Page 27 of 68

Page 28

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

CONVECTION FAN MOTOR

CONVECTION FAN

MOTOR TYPE

1 motor Leroy-Somer (Hanning)

1 motor Brook-Crompton 2 motors Leroy-So mer

(Hanning) 2 motors Brook-Crompt on 30 90 1 motor Leroy-Somer

(Hanning) and 1 motor Brook-Crompton

: (*) Ove n s are shipped from the factory with th is

NOTE

motor and the oven control is configured accordingly.

The values correspond to th e current limits only and are not the actual current draw of the motor.

POSITION 1

(MINIMUM)

VALUE

POSITION 2

(MAXIMUM)

855

860

46 120

38 105

11. If all t he values have been entered corr ectly, press the

START

key to sav e the confi guration settings and exit the configuration mode. To review or change a configuration value press the

key to return to step 1.

TIME

With each successful sel ec tion, the corresponding num ber is displayed in t he temperat ure display. F or the adjustment k nob, an upper or lower dash line will be displayed (depending on rotation). See t able below.

Verify that all knob positi ons and keypad buttons are func tioning proper ly. When satisfied, press and hold the

START

key for 4

seconds to advance to the next step.

SWITCH/ KEYPAD/KNOB POSITION NO./DASH

SELECTOR SWITCH OFF 0 SELECTOR SWITCH HOT AIR 1 SELECTOR SWITCH STEAM 2 SELECTOR SWITCH COMBI 3 SELECTOR SWITCH COOL DOWN 4 SELECTOR SWITCH DE-SCALE 5 KEYPAD BUTTON TIME 6 KEYPAD BUTTON PROBE 7* KEYPAD BUTTON TEMP 8

LINE

DIAGNOSTIC TEST MODE -

MANUAL CONTROL S

The test mode can be entered only when the oven is

OFF.

The test are performed in a fixed sequence of:

1. Displays and LED’s

2. Selector swit c h, keypad and adjustm ent knob.

3. Relays (relay on for max. of 2 seconds).

To Perf orm:

1. To enter the t est mode press the keys simul taneously for 4 seconds.

TEMP

START

2. The DISPLAY and LE D test consists of flashing

all di splays and LED’s while the buzzer sounds. In the temperature displ ay , all the individual display segments and the word “test” will flash intermittent ly. Verify al l the displays and LED’s are flashing. This test will continue until the

START

key is pressed and held f or 1 second t o

advance to the next step.

3. The word “test” is displayed in the temperature

display and 10 (start button keypad no.) is displayed i n the “time” display. The KEYPAD test consists of r otating the selec tor switch clockwise

through each position, pressing each button on the keypad and r otating the adjustment knob clockwise counterclockwise

to check the functionality of

then

each.

and

KEYPAD BUTTON DOOR 9 KEYPAD BUTTON START 10 KEYPAD BUTTON COMBI 12* KEYPAD BUTTON VENT 13*

ADJUSTMENT KNOB ROTATE CW

ADJUSTMENT KNOB ROTATE CCW

: Asterisk (*) indicates not ava ilable on standard

NOTE

manua l controls.

“—“

4. The word “test” will still be displayed in the temperat ur e display. The RE LA Y test consist of selecting a par ticular r elay by its code number (01 to 11) with t he adjustment knob and pressing the

key to energize the relay

TEMP

for a maximum of 2 seconds. See table below. Verify that each selec ted relay (K1 t o K 10) is functioning. The status of the relay output (0 or

1) will be displayed in the left side of the temperat ure display. When satisfied, press and hold the

START

key for 1 second to advance

to the next step.

“—“

Page 28 of 68

Page 29

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

CODE RELAY COMPONENT TEST CONDITION

Door magnetic reed switch. Result will be displayed

01 K1 door motor

02 K2 cavity vent motor

03 K3, K6 contactor KM1 (half power, full speed)

04 K3 cooling fan(s) and door light only

05 K3, K4 water injection solenoid (humidifier) Visual - water injection into cavity. 06 K5 drain pump Water level sensors (water level in steam generator) 07 K3, K5 water fill solenoid Water level sensors (wa ter level in steam generator)

contactor KM2 (half power, ha lf speed);

08 K3, K7

09 K3, K8

10 K3, K10

11 K3, K9

on 20 levels only, contactor KM3 and drain cool do wn solenoid.

contactor KM3 and drain cool down solenoid on 6 & 10 leve ls; contactor KM5 on 20 levels only.

(steam generator heating elements) contactor KM7 (convection heating

elements on 10 & 20 levels) contactor KM6

(convection heating elements)

automatically. Rotate the door handle to change the condition. Press and hold the TEMP key to close the door; release to open.

Cavity vent micro switch. Result will be displayed automatically. Press and hold the TEMP key to change condition.

Convection fan motor value - press and hold the TEMP key for 30 sec. to test the fan motor configuration settings. The test result will be displayed .

Cavity Hi Limits and steam generator thermal fuse(s). Press and h old the TEMP key for result.

0 = open; 1 = closed

0 = incorrect; 1 = correct.

0 = open; 1 = closed

0 = unsatisfied; 1 = satisfied

5. t1 is display ed in the time display and t he ac tual cavity t emperature i s di splayed in the temperature di spl ay . Verify the probes are sensing tem per ature correctly. Rotate t he adjustment knob and select the probe temperat ure to display (T1 = cavity probe (top on 20 levels); T2 = bottom cavit y pr obe ( 20 levels only); T3 = cooking probe).

6. To exi t the diagnostic test mode, pr ess and hold t he

SERVICE ERROR LIGHTS

1. There are f our lights at the bottom of the control. When l it, they tell the operator that t he oven needs service related to the component that the l ight(s) represent. Refer to “TROUBLESHOOTING” for display error codes.

START

key for approximately 3 seconds.

: If the steam generator thermal fuse(s) or the

NOTE

cavity high limits open, the steam gener ator heat and the convection heat er ror light s will come on.

2. Turn the oven off and reset the oven control . A. P r ogrammable control - pr ess the off key. B. M anual controls - r otate the selector switc h

to the of f positi on.

3. Correct the pr oblem rel ated to the service error light. See “TROUBLESHOOTING” section.

4. Turn the oven on and check operation. A. P r ogrammable control - pr ess the on key,

select a heating mode and press start key to begin.

The lights are, from left to right.

A. Water suppl y. B. Convection heat. C. Steam gener ator heat. D. Cavity f an.

B. M anual controls - r otate the selector switc h

to one of t he three heating modes.

: On water supply err or s, monitor the oven for

NOTE

at least 5 m inutes to pass the “time out” period for the steam generator fill.

Page 29 of 68

Page 30

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

HEATING ELEMENTS

WARNING:

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

1. Measure the voltage at the heating element terminals and verify it against t he data plate voltage.

A. If voltage is incorrect, find the sourc e of

2. If volt age is correct, c hec k c ur r ent draw (amps) through the heating element lead wires. If current draw is correc t then heating element i s ok.

A. If current draw is not correct then, replace

3. Check for proper operation.

MODEL VOLTAGE

VCE6H VCE10H VCE20F

VCE20H

NOTE

MODEL VOLTAGE

VCE6H VCE10H VCE20F VCE20H

NOTE

THE FOLLOWI NG ST EPS REQUIRE

the problem.

See table below for p roper values.

heating element.

CONVECTION HEAT

KW PER

ELEMENT

208 9 15 14 240 9 13 19 480 9 11 26 208 6 10 22 240 6 8 29 480 6 7 38

Values in the table are nom i n al. Tolera nce is

+5/-10 %.

STEAM GENERATOR HEAT

KW PER

ELEMENT

208 8 13 16 240 8 11 22 480 8 10 29

Values in the table are nom i n al. Tolera nce is

+5/-10 %.

AMPS PER ELEMENT LEAD

(3 PH)

AMPS PER ELEMENT

LEAD

(3 PH)

OHMS PER

ELEMENT

OHMS PER

ELEMENT

OVEN DOOR ADJUSTMENT

NOTE

: Follow the steps in the order outlined below

for proper door adjustment .

1. Turn the oven off.

2. Check the level of the oven from lef t to right and front to back, in t he exact loc ation where the ov en is to be positioned.

A. If the oven is not

necessary adjustment s before proceeding to the next step.

B. If the oven is level, then proceed to step 3.

3. Loosen the hinge screws just enough to adjust the door position but so the door stays when not being m oved or supported.

4. Position the door square with the oven as shown below.

5. Tighten t he hinge screws after adjusting.

WARNING:

DISCONNECT THE ELECTRICAL 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. Remove the right side panel and the contr ol

panel as outlined under ”COVERS AND PANELS”.

7. Loosen the screws on the door roller (str iker)

just enough to adjust its position but stay s when not being m oved.

level, make the

Page 30 of 68

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ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

8. Position the door roller against the “striking” edge of the locking arm but do not close t he door.

A. Observe the posi tion of the door roll er to

the locking arm.

B. A djust the door rol ler so it m ates at the

“striki ng edge” ( bottom of the sloped edge) of the locking arm. The exac t distance of the “striking” edge to the bottom of the roller is stated to be 1 mm (0.040 inches). This position allows the locking arm to be pushed down during closing, and after closing the roller will be positioned in the hook.

10. With t he door in the closed posit ion the roller should be cradled in the locking arm hook.

11. Replace the control panel.

12. Close the door handle. The handl e is centered in the cut- out of the control panel so the magnet i n the handle will operate the m agnetic reed switch.

1) If the door roller mates against the locking arm as described, t hen tighten t he door roller screws and proceed to step 9.

2) If the rol ler does not mate against the locking arm as described and there is no more adjust ment in t he door r oller, then loosen the bolts securing the door motor assem bly and adjust the locking arm position as described.

3) The door roller should now m ate against the locking arm pr oper ly. Tighten t he bolts securing the door motor assembly and proceed to step 9.

9. Push the door closed and observe the locking arm. I t must not contact the bottom edge of t he slot that t he locking arm travels in whil e the door is closing.

NOTE:

adjustable if necessary. Remove t he br ac k et from the bottom of the control panel. Loosen the hex nuts securing the switch t o the bracket and position the switch (left to ri ght) where desired. Tighten hex nuts and replace brack et. Check switch for proper operation.

WARNING:

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

13. Turn t he oven on.

14. The door shoul d automati c ally pull shut and

15. The space between the t op inner edge of t he

The magnetic reed switch position is

THE FOLLOWI NG ST EPS REQUIRE

lock into position t o seal the oven opening.

door and the oven should be equal along its length.

16. Thi s space can be adjusted by adding or

NOTE

motor assembly mounting bolts.

Page 31 of 68

removing shims from the door hinges or the door locking mechanism.

: Ext r a shims are provided under the door

Page 32

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

A. If the space i s l arger at the hinge end,

remove shim( s) from behind the hinges or from in fr ont of the door locking mechanism.

B. If the space i s sm aller at t he hinge end,

add shim(s) behi nd the hinges or in front of the door locking mechanism.

: If shi ms are removed f r om the top hi nge,

NOTE

also remove them from the top hinge.

17. If the space is equal, but the ov en does not seal. Remove shims from the hinges and in front of the door l oc king mechanism.

18. Once t he nec essary adjustments have been made and the door is closing properl y , replace the right side panel and turn the oven of f.

BUZZER ADJUSTMENT -

PROGRAMABLE CONTROL

To properly set the buzzer, both t he frequency and volume results. These adjustments are independent of each other and requir e a c onfigurat ion mode change and a manual adjustment of the tri m pot.

WARNING:

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

1. Remove the right side panel as outli ned under

2. Place the control into configuration m ode as

must be adjusted to obtain the best audible

THE FOLLOWI NG ST EPS REQUIRE

“COVERS AND PANELS” in “REMOVAL AND REPLACEMENT OF PARTS”.

outlined under “PROG RAMABLE CONTROL CONFIGURA TION MODE”.

4. To adjust the buz z er volume, turn t he buz z er volume adjustment screw until the desired volume is obtained.

5. Once the buzzer frequency and volume are set to the desired level s, pr ess the save the sett ing and exit the configuration mode.

OFF

key to

BUZZER ADJUSTMENT -

MANUAL CONTROL S

WARNING:

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

must be adjusted to obtain the best audible

THE FOLLOWI NG ST EPS REQUIRE

A. Press the

through the configuration parameter s until reaching the step for setti ng the buzzer frequency.

B. To adjust the buzzer frequency, foll ow the

procedure as outlined in step 6 under “PROGRAMABLE CONTROL CONFIGURA TION MODE”.

3. After the buzzer frequency is set to the desir ed level, press the through the configuration parameter s agai n, until r eaching the step for setting the buz z er frequency.

START/STOP

key to cycle

Page 32 of 68

1. Remove the right side panel as outli ned under “COVERS AND PANELS” in “REMOVAL AND REPLACEMENT OF PARTS”.

2. Place the control into configuration m ode as outlined under “M A NUA L CONTROLS CONFIGURA TION MODE”.

A. Press the

confi gur ation param eters until reac hing the step for setting the buzzer frequency.

B. To adjust the buzzer frequency, foll ow the

procedure as outlined in step 6 under “MANUAL CONTRO LS CONFIGURA TION MODE”.

3. After the buzzer frequency is set to the desir ed level, press the confi gur ation param eters again, unti l reaching the step for setting the buzzer frequency.

key to cycle through the

TIME

key to cycle through the

TIME

Page 33

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

4. To adjust the buzzer volume, turn the buzzer volume adjustment screw until the desired volume is obtained.

5. Once the buzzer frequency and volume are set to the desired level s, pr ess the save the sett ing and exit the configuration mode.

START

key to

CLEAN CYCLE MODE - STEAM

GENERATOR DELIMING

WARNING:

HOT. USE CARE WHEN OPERATING, CLEANING OR SERVICING THE OVEN. THE COOKING COMPARTMENT CONTAINS LIVE STEAM. STAY CLEAR WHEN OPENING DOOR.

Steam generator deliming should be done on a scheduled basis. The frequency depends on the quality of the loc al water supply and whether or not a water treatment system is used. Even with the use of a water tr eatment system , periodic deliming of the steam generator is still required.

On combi ovens using a water t r eatment system , follow the instructions for that system to deli me the steam generator . Only use the ty pe of chemical recommended or described in the deliming instructions for the system in use. If the Kleensteam water treatment system is used, Scalekleen is the recommended chemi c al.

If a water t reatment system is not instructions for deliming the steam generator usi ng vinegar, as outli ned in the steps below. See “WA TER CONDITI ONING” under “GENERAL”.

THE OVEN AND ITS PARTS ARE

used, follow the

1. Programmable oven control to turn the oven on and press the enter the programed cooking mode. Program number “00" is displayed in t he pr ogr am display. P r ess the down key once, to select the clean cycle program or if at program 98 press the up key once to select the clean cycle program. Press and hold for automatic scrolling. “CC” is displayed in the program number display and “dSCL” is displayed in the temperat ure display. Pr ess the key to start the clean cycl e and the start/stop LED turns on.

Manual oven controls select the descal e mode by rotating the selector knob to dS CL. “dSCL” is displayed in the temperat ure display and the clean cycle starts automatically.

2. The steam generator begins a normal drain cycle.

A. At the end of the drai n cycle, ov en beeps

for 10 seconds. On the programmable oven control, the star t/stop LED turns of f.

B. “40" minutes is di spl ay ed in the time

display and “dSCL” is displayed in the temperat ure display.

3. Add the deli ming chemical. A. If a water treatment system is installed in

the water li ne to the steam generat or .

1) Tur n the water supply off.

2) Press the relief valve at the top of the feeder bowl head to relieve system pressure.

3) Unscrew the feeder bowl (clear) from the head and remove cartridge from the bowl.

4) Remove t he dip from its holding clip and insert the dip tube (o-ring first) in to the center port.

5) Add t he appr opriate am ount of deliming chemical to the feeder bowl for the c ombi m odel and mi x the contents of the bowl with water. See table below.

: Do not

NOTE

amounts listed in the table below or provided with the delimi ng c hemical for the water treatment system in use.

6) Repl ac e the feeder bowl.

7) Tur n the water supply on.

exceed the chemical

- Press the ON key key to

PROG

START/STOP

- Turn the oven on and

Page 33 of 68

Page 34

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

B. If there is no water treatm ent system

installed in the water line to the steam generator, then add an amount of vinegar equal

to the tank volume for the combi

model. S ee table below.

1) Add t he vinegar to the steam generator through the opening in the oven cavity. Use the funnel and flexible tube provided with the oven.

TANK

MODEL

VCE6H VCE10H VCE10F VCE20H VCE20F

NOTES

VOLUME

(GAL) (QT)

0.8 3.2 1.0 Packet or 7.0 oz.

1.6 6.3 1.5 Packets or 10.5 oz.

2.6 10.5 2.5 Packets or 17.5 oz.

3.4 13.7 3.5 Packets or 24.5 oz.

: 1. Scalekleen is also available in a 2.2 lb packet

size. If the 2.2 lb. size is used, do entire packet. Measure the appropriate amount in ounces then add.

2. Do no t exceed the a mounts listed in the table above.

AMOUNT OF

SCALEKLEEN ADDED

TO FEEDER BOWL

(7 OZ. PACKET SIZE)

add the

not

1, 2

4. Press the START but ton on the ov en c ontrol (programmable or manual) to begi n the clean cycle.

A. The door closes and locks and the

buttons/knobs on keypad l oc k out to prevent interruption until the clean cycle is completed. No other operations can be performed for approximately 45 minutes.

: Pressing the off key will not discontinue

NOTE

the clean cycle or t urn the oven off. If a power interruption or other malf unc tion occurs, the clean cycle will resume from step 5B when power is restored.

B. If deliming through a water treatment

system, the steam generator begi ns a normal fill cycle.

1) When the proper water level is reached, the steam generator heating element s and cavit y fans turn on.

C. If deliming using v inegar, the amount

added to the steam generator is already at the proper level.

1) The steam generator heat ing element s and cavit y fans turn on.

2) As the vinegar level lowers, the steam generator will then f ill with water as required.

: If the cavity temperature is above the

NOTE

steam temperature set point, automatic cooling will occur. See “WATER INJECTION (HUMIDIFIER) under SEQUENCE OF OPERATION”.

D. The timer starts counting down and the

oven will steam for 30 minutes.

5. At the end of 30 minut es. A. Heating elements and cavity f ans tur n off.

: Heating elements and cavity fans

NOTE

remain off dur ing “timed” drain and fill cycles. B. Time display shows 10 minutes but does

not continue c ounting down.

C. Steam gener ator drains (45 seconds on 6

& 10 levels; 60 seconds on 20 levels).

D. Steam gener ator fills (37 seconds on 6 &

10 levels; 75 seconds on 20 levels).

6. The steam generator drains twice more and fills once (both ti med) to rinse out any remai ning chemicals.

7. The steam generator begins a normal fill cycle. A. When the pr oper water level is reached,

the heating elements and cavity fans turn on.

B. The tim er st ar ts counting down and the

oven will steam for 10 minutes.

8. When time expires, the steam generator drains a final time.

9. At the end of the clean cycle procedure. A. The oven will beep for 10 seconds and the

temperature display will show “dOnE” indicating the cycle is complete.

B. The door unlocks and opens (slightly) and

the buttons/knobs on keypad unlock.

NOTE:

If an error occurs during the clean cycle, “FAIL” will display in the temperature display instead of “dOnE”.

C. If a deliming chemi c al was added to the

water treatment system.

1) Tur n the water supply off.

2) Press the relief valve at the top of the feeder bowl head to relieve system pressure.

3) Unscrew the feeder bowl from the head, remove the di p tube and reinstall the cartridge.

4) Repl ac e the feeder bowl.

5) Tur n the water supply on.

D. If vinegar was added to the steam

generator, then procedure is complete.

10. Combi oven is ready for normal use.

Page 34 of 68

Page 35

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

BATTERY BACKUP -

PROGRAMABLE CONTROL

The battery backup module allows the SRAM (static ram) to retain the configurat ion and program infor mation in memory if there is a power loss. The battery backup may com e in a two piece confi gur ation of an S R A M c hip mounted ont o a battery module or a one piec e S RA M and battery module combination. The 28 pin non- volatile SRAM/Battery modul e is located on the CPU board. Unless power to the ov en is interrupted and then restored, a low voltage bat tery condition would otherwise not be detect ed.

1) Press the key pad ON button. If dashes “- - -“ are displayed in the

time

display and the temper ature display, then battery module volt age may be low.

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

2) Remove t he r ight side panel as outlined under “COVERS AND PANELS”

With the power disconnected from

the oven

voltage while m ounted on the CPU board. Measure the voltage between pins 14 and 28 on the SRAM chip. If voltage is less than 3VDC, t hen replace the SR A M /Battery module combination (one or two piec e) as outlined below in “BATTERY REPLACEMENT” and repeat battery test.

, check the bat tery module

888c

is displayed in

Battery Test

1. Disconnect power f r om the oven, then turn the power back on.

2. The control board will perform a power up diagnostic test, sound the buzzer and turn the displays and lights on then off.

A. If the displays go blank and lights turn of f

on the control , then the battery backup is functioning properly.

B. If oven or control will not power up, see

“TROUBLESHOOTING” section for a list of possible c auses.

C. If c ode numbers appear in the t ime and

temperat ure display or the c ontrol operation i s err atic, the battery backup may be m alfunct ioning.

NOTE

: SRAM/Battery backup module voltage can not being mount ed on the CPU board and powered at least once.

NOTE

: Do not labeled battery backup quickly dr ains the SRAM resulting in an 888c display err or .

3. The ov en should now operate properly.

ISSI

be measured without first

use a battery backup

on the top. This type of

Page 35 of 68

Page 36

ELECTRIC COMBI OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

Battery Replacement 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.

NOTE

SRAM/Battery module, it is recommended that a 28 pin EPROM extraction tool and a 28 pi n E P ROM insertion tool be used.

If installi ng the two piece SRAM and bat tery backup confi gur ation, the SR A M and battery module must be assembled before install ing on the board.

Caution

with the pins down on a metallic or conductive surface. This may result in component malfunction.

On the two-piec e c onfigurat ion, it is criti c al notch on the SRAM and the battery module mat c h up on the same end. Carefully line up the SR A M pins and insert them into t he battery module. Ensure that all SRAM pins are i nsert ed pr oper ly.

DISCONNECT THE ELECTRICAL

: When removing and repl ac ing the

: Do not

place the battery backup m odule

that the

Install the SRAM and batter y module assembly onto the CPU board with the notches pointing up. Careful ly line up the battery module pins and insert them i nto the socket on the CPU board. Ensure that all pi ns are inserted properly.

TWO PIECE CONFIGURATION SHOWN

For the one piece SRAM and battery module combination, position the module with the corner dot/notch pointing up. Carefull y line up the battery module pins and insert them into the socket on t he CPU board. Ensure that all pins are inserted properly.

Turn the power to the machine back on

while the cont r ol performs a power up diagnostic test, sounds the buzzer and tur ns the displays and lights on then off. If t he display and li ghts turn off, then the batter y backup is functioning properly. If the control or oven does not come back on, tur n the

off, re-check t he mounting of the assembly ,

power then turn the power back on. If t his does not solve the problem then refer to steps 2B and 2C above as outlined in “BATTERY TEST”.

. Wait

Page 36 of 68

Page 37

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

ELECTRICAL OPERATION

COMPONENT FUNCTION

1A Relay Board ...............

2A Oven Control ..............

3A Display/Keypad Board ......

F1 Fuse .....................

F2 Fuse .....................

F3 Fuse .....................

F7 Fuse .....................

F8 Fuse .....................

F9 Fuse .....................

1LT O ven Light ...............

Takes the inputs from oven control board to operate relays that control power to the components.

Manages all functions of oven operation, takes i nput signals and performs outputs as required. Referred to as the CPU board on the Programable control and the Display/Key pad/CPU board on the manual controls.

Sends signal to the oven contr ol from keypads and door switch. Displ ay s oven and cook ing inf or mation ( pr ogr ammabl e c ontrol only) .

5A/250V - Protects power supply board/transformer primary “L1 side” (in series with F8 Fuse).

5A/250V - Protects power supply board/1T tr ansformer primary “L2 si de” (in series with F9).

2A/250V - Protects the 1T transformer secondary ( 230V A C) control circuits to all c ontactors, f ans, motors and solenoids.

5A/600V - Protects cav ity f an motor(s) contr ol circuit. FLQ5 - Protects L2 power from terminal block and power supply board/1T

transformer primary (in seri es with F1 Fuse). FLQ5 - Protects L1 power from terminal block and power supply board/1T

transformer primary (in seri es with F2 Fuse). Illuminates oven cavity.

1MTR Cavity Vent Motor .......

2MTR Drain Pump Motor .......

3MTR Cooling Fan ............

4MTR Door Motor .............

5MTR Cavity Fan Motor ........

6MTR Cavity Fan Motor ........

7MTR Cooling Fan ............

8MTR Door Motor .............

1TC Cavity P robe .............

2TC Cooking Probe ...........

3TC Cavity P robe .............

1SOL Water Injection

Solenoid Valve ...............

Opens and closes oven c avity exhaust port. Empties water from steam generator. Exhausts hot ai r from r ight side control compart ment to cool components. Pulls door into and out of lock position. Circulates air through the oven cavity. Circulates air through the oven cavity ( 20 level only). Exhausts hot ai r from r ight side control compart ment to cool components

(20 level only). Pulls door into and out of lock position (20 level only) . Senses the oven cavit y temperature and signals the control. Senses the internal pr oduc t temperat ur e and si gnals control. Senses the lower oven c avity temperature and signals the contr ol (20

level only).

Admits water to the inj ec tion nozzle in the cavity t hat sprays onto the convec tion heating elements when requested by the oven control or manually by the operator . This cools the oven temperature or adds a burst of steam to the cavity in conv ection mode.

Page 37 of 68

Page 38

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

2SOL Drain Cool

Down Solenoid Valve ..........

3SOL Water Fill

Solenoid Valve ...............

1SW Door Magnetic

Reed Switch .................

Admits cold water to the cavity drain and m ixes with the hot to condense steam and cool the drain water before entering t he floor drain. This solenoid valve is energized whenever the steam gener ator heating element s are energi zed. Does not operate during a drain cycle.

Admits water to the steam generator when requested by to ov en c ontrol, to fill or replenish the steam generator water level.

Signals the oven control that door is closed and can be locked.

2SW Door Mech S witch ........

3SW Door Mech S witch ........

5SW Door Mech S witch ........

6SW Door Mech S witch ........

4SW Cavity Vent S witch ........

1TAS & 2TAS

High Limit Thermostats ........

1TF & 2TF T hermal Fuses ......

3TF Thermal Fuse ............

4TF Thermal Fuse ............

1TB Terminal Block ...........

1T Power Supply Board

& Transformer ...............

Allows door motor to operate to unlock Allows door motor to operate to lock Allows door motor to operate to lock Allows door motor to operate to unlock

door. door. door (20 Lev el only).

door (20 Lev el only).

Signals the oven control, that t he vent is opened or closed.

Removes power from boar d r elays K6, K7, K8, K 9 & K 10 if oven cavity temperat ure rises above 650°F . Must be reset manually.

Removes power from K M 1, KM2, KM3 & KM 6 ( 6 level); KM1, K M 2, KM3, KM6 & KM7 (10 level) and KM1, KM2, K M 3, KM5, KM6 & KM 7 ( 20 level half and full ) if steam generator temperature ri ses above 243°F.

Removes power from K M 1, KM2, KM3, K M 5, KM6 & KM7 (20 l evel half only) if steam gener ator temperature rises above 243°F.

Removes power from K M 1, KM2, KM3, K M 5, KM6 & KM7 (20 l evel full only) if steam gener ator temperature rises above 243°F.

Incoming voltage supply connection.

Supplies 12VAC for cavity light; 24V A C to relay board and oven control board; 230VAC or 90VA C to cavity f an motor(s) at full or half speed; and 230VAC to all other electrical c ontrols except heaters.

Water Level Sensors ..........

KM1 (1CON) .................

KM2 (2CON) .................

KM3 (3CON) .................

Senses the water level in the steam generator and signals the oven control t o energize or de-energize the fill solenoid valve. The water f ills until the circuit between the two sensors is completed plus an additional

0.5 seconds. With the water at the proper level, if a cal l for heat is made from the ov en c ontrol, the steam generator heat ing elements turn on until the cavity temperature i s satisfied then turn off. When the water level falls, the circuit opens and the fill cycle repeats. If t he circuit rem ains open longer that three seconds, the heating elements are de-energized until the level rises to complete the c ircuit.

Contactor for half power full speed (1500 RP M ) c avity fan motor(s). When ener gized along with K M 2, provides full power and full speed (contactor s KM1 + KM2 energized). When half power half speed mode is selected, contactor KM1 i s energized only.

Contactor for half power half speed (800 RPM) c avity fan motor(s). When energized along wi th KM1, provides full power and full speed (contactor s KM1 + KM2 energized). When half power half speed m ode is selected, contactor KM2 is not

energized.

Contactor for steam generat or heating elements; (2HTR) on 6 level; (2HTR) and (4HTR) on 10 level; (2HTR) and (4HTR) on 20 level half.

Page 38 of 68

Page 39

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

KM5 (5CON) .................

KM6 (6CON) .................

KM7 (7CON) .................

1HTR Heating Element .........

2HTR Heating Element .........

3HTR Heating Element .........

4HTR Heating Element .........

5HTR Heating Element .........

6HTR Heating Element .........

7HTR Heating Element .........

8HTR Heating Element .........

NOTE

: The relay’s below are mounted on the relay board and are not individually replaceable.

Contactor for steam generat or heating elements; (7HTR) on 20 level half and (8HTR) on 20 level full only.

Contactor for convection heating elements; (1HTR) on 6 level; ( 1HTR) inner on 10 level; ( 1HTR) Inner top and (5HTR) inner bott om on 20 level.

Contactor for convection heating elements; (3HTR) outer on 10 level; (3HTR) outer t op and (6HTR) outer bott om on 20 level.

Single convection heating el ements on 6 level; I nner on 10 lev el and 20 level (top).

Steam generator heating elements on 6, 10 and 20 l evel. Outer convecti on heating elements on 10 level and 20 level (t op). Steam generator heating elements on 10 and 20 level. Inner convection heat ing elements on 20 level (bottom). Outer convecti on heating elements on 20 level (bottom). Steam generator heating elements on 20 level 1/2 size. Steam generator heating elements on 20 level full si z e.

K1 Door Relay ................

K2 Vent Relay ................

K3 On-Off Relay ..............

K4 Water Injection Relay .......

K5 Water Fill Relay ............

K6 Half Power

Full Speed Relay .............

K7 Half Power

Half Speed Relay .............

K8 Steam Regulation Relay .....

Controls power to door motor(s). Controls power to cavity vent motor. Controls power to component cooli ng fan(s) and supplies power to one

side of K4, K 5, and K6, K7, K8, K 9 and K10 through the thermal fuses and high li mit t hermostats.

Controls power to water injection solenoid valve ( humidifier) and door light when K3 is ON.

Controls power to water fill solenoid valve (when K3 is ON) and drain pump motor (when K3 is OFF) .

Controls power to contac tor KM1. This relay is energized along with K7 for full power full speed operation, and is also energi z ed in half power speed half mode. When half power half speed mode is selected, relay K 6 is energized.

Controls power to contac tor KM2. This relay is energized along with K6 for full power full speed operation. When half power half speed mode is selected, relay K7 is not power to contactor K M 3 for steam gener ator heating el ements, and powers 2SOL drain cool down solenoi d.

Controls power to KM3 for steam generator heating el ements, and powers 2SOL drain cool down solenoi d valve on 6 & 10 l evels. On 20 level models only, contr ols power to contactor KM5.

energized. O n 20 level models only, controls

K9 Convectio n Heat Relay ......

K10 Convectio n Heat Relay .....

Controls power to KM6 for convection heating elements; (1HTR) singl e on 6 level ;(1HTR) inner on 10 level; (1HTR) inner top and (5HTR) inner bottom on 20 level.

Controls power to KM7 for convection heating elements ; (3HTR) outer on 10 level; (3HTR) outer top and (6HTR) out er bottom on 20 level.

Page 39 of 68

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

COMPONENT LOCATION

Page 40 of 68

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Page 41 of 68

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

SEQUENCE OF OPERATION

The convection and steam heating theory outlined below, cover s the pr ogr amable and m anual oven c ontrols unless otherwise stated.

Heating Mode and Cavity Fan Speeds

= 1/2 power and full speed cavity fan(s).

KM1

= 1/2 power and half speed cavity fan( s).

KM2

KM1 + KM2 KM3 and KM5 KM6 and KM7

Convection mode, full power and full speed cavit y fan(s) = KM1 + KM2 + KM6 ................ (6 level)

Convection mode, half power and half speed cavity f an(s) = KM1 + KM6 ........................... (6 level)

Steam mode, full power and full speed cavity fan(s) = KM1 + KM2 + KM3 ................ (6 & 10 level)

Steam mode, half power and half speed cavity fan(s) = KM1 + K M 3 ........................... (6 & 10 level)

Heating Regulation

When the oven begins heating, the convection elements are on at ful l power until the cavity temperature reaches 18°F below set point temperature. If t he c avity temperature is rising at 3.6°F per second or great er , the heating elements will turn off. If the cavity temperature does not reach set point or dr ops more than 18°F bel ow set point, the heating elements turn bac k on at full power until reac hing the actual c avity set point temperature then turn off. When the cavity temperature drops 0.9°F below set point, t he heating elements turn on at 1/4 power (one element - 3 sec on, 4 sec off) until c avity temperature returns to the actual set point then turn off. The oven continues to operate (cycl e) at 1/4 power as long as the set point tem perature can be maintained. If the cavi ty temperat ure drops 2.7°F below the set poi nt, the heati ng elements turn on at 1/2 power (one element on) until cavity temperature retur ns to the actual set poi nt then turn off. I f the cavity temperature dr ops more than 5.4°F below the set point, the heating elements turn back on at full power until cavity temperature reaches 1.8°F bel ow set point. At 1.8°F below set point, the heating elements turn on at 1/4 power (one element - 3 sec on, 4 sec of f) until c avity temperature returns to the ac tual set point then turn off.

= Full power and full speed cavi ty fan(s). = Steam mode regulation (KM5 on 20 l evel only). = Convection mode regulati on.

KM1 + KM2 + KM6 + KM7 ..... (10 & 20 level)

KM1 + KM7 ........................... (10 level)

KM1 + KM6 + KM7 ................ (20 level)

KM1 + KM2 + KM3 + KM5 ..... (20 level)

KM1 + KM5 ........................... (20 level)

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

On 20 level m ac hines (half and full si z e) the heating mode regulation is the sam e but with these additional points to remember:

Top and bottom heating elements operate



independently and correspond to the top and bottom c avity temperature probes.

Display always shows the lowest temperat ur e.



If t he c avity temperature exceeds the set point



temperat ure, the heating elements will not turn on until both cavity temperature probes sense a temperat ure below the set point.

Steam Pre-Heat

When the oven is turned on and the heating mode (conv ec tion or combi) is select ed, the steam generator f ills with water until the proper level is reached. On the programable oven contr ol, press the Start/Stop key to begin oven heat ing. On the standard and deluxe manual cont r ols, the water preheat begins after the heat selector knob is turned to either convection or combi mode. On initi al start up only, after the cavit y temperatur e r eac hes 1.8°F below set point temperature (convection = 1/4 power) the steam generat or pr e- heat begins. The steam generator heating elements then turn on for a total t ime of 1.5 mi nutes on 6 and 10 levels and 2.5 minut es on 20 level ovens, if they are on at full power only. When the convection heating elements turn back on (at half power) to maintain cavity set point temperature, t he st eam generator heating elements will also turn on (at half power), for a preheat time value that is automatically cal c ulated. No additional heating of the steam generator takes place unti l either a steam or combi mode select ion is made.

Steam Regulat ion

Before cook ing in steam mode, it is recomm ended that the oven be pre-heated in convec tion mode at 200°F to bri ng the oven cavity up to tem per ature for immediate steam cooking.

Steam Mode

- W hen the oven is turned on and the steam mode is selected, the steam generator f ills with water until the proper level is reached. On the programabl e oven contr ol, press the Start/S top key to begin steam generator heating. The steam gener ator heating elements turn on (always at full power) until the actual set point temper ature is reached then turn off. I f the steam mode is selected after c onvection or combi mode heating, the steam generator pr e- heat is compl ete and the oven is ready for steam mode cooking.

At this time, if the cavity temperature is lower than the set point, the steam generator heating elements turn back on until reachi ng the actual set poi nt temperat ure then turn off. If the cavity temperature is higher than the set point, t he steam generator heating elements remain off and the ov en will go into cool down mode until r eac hing the set point temperat ure. W hen the cavity temperature falls 1°F or more below set point temper ature, the heating element s turn on until the cavity returns to the actual set point temper ature then turn off.

Combi Mode

- On the programable and deluxe manual controls, the steam generator heating element s operate on a portion of the convec tion bake ti me to provide the oven with steam heat. The amount of steam introduced depends on the combi st eam factor setting (1-6 LED’s lit) on the control. The default steam factor setting is 5 (1 LED lit). On the standard manual control, a fixed steam factor of 20 i s used. When the steam generator elements are on at full power, the convecti on elements are off. If the convec tion heating elements are on at half power, the steam generator heat element s can also be on at half power. The toggling of the heating element power allows the current dr aw of the ov en to remain at lower levels. If the ov en set point tem per ature is less than the steam temperatur e setting (195°F to 212°F), the steam factor is limited t o 10 regardless of t he number of LE D’s lit.

: The steam temperatur e setting (boiling point

NOTE

adjustment ) for el evation is pre-selected in the confi gur ation mode.

Indicator Lights (on front panel)

 



  

NOTES

2. Default on Standard manual control and is non- adjustable.

10 5 70

30 5 40 40 5 25 50 5 10

: 1. Default on Programmable and Deluxe manual controls.

Steam

Factor

20 5 55

55 85

Seconds

OFF

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Water Injection (Humidifier)

Water can be injec tion onto the convection heating element s in the oven c avity and is used in these three ways:

1. Automat ic Cooling (Programable & Manual Controls) - I f the steam mode is selected after cooking in convect ion or combi mode and the cavity temperature is above 302°F, water is inject ed interm ittently to cool t he oven cavity . Below 302°F, water i njection is continuous until the cavity reaches the st eam temper ature set point. The cavity vent will open to assist in cooling but close when the steam set point temperat ure is reached. The humidifier LED turns on or cycles on and off when water is being inj ected.

2. Manual Cooling/Humidification (P r ogr amable Control Only) - Press and release the humidifier key to provide several seconds of water injection (steam bur st) , if the oven cavity temperat ure is above 302°F. Press and hold the humi difi er key to provide continuous water inject ion, if the oven cavity temperature is below 302°F. When the hum idif ier key is pressed, the LED turns on.

3. Cool Down Mode (Programable Control )

Cools the oven cavity to the desi red set point temperat ure before start ing a dif ferent cooking cycle, cooking mode or shutting the oven of f. This mode c an also be included as one of the five phases in a cooking program. The humidi fier LED turns on or cycles on and off when water is being injec ted.

A. P r ess the t ime down key.

1) Di spl ay shows “ - - - “ then “11 11 11" indicat ing the oven is in cool down mode. The default temperature is 158°F and can be adjusted if desired.

2) Oven cavity vent opens to assist in cooling but will close when the set point temperature is reac hed.

B. P r ess the up key to exit c ool down mode.

Cool Down Mode (Manual Controls)

Cools the oven cavity to the desi red set point temperat ure before start ing a dif ferent cooking cycle, cooking mode or shutting the oven of f.

1. Rotate the selector knob to the

COOL DOWN

position. A. Time display shows “- -. - -“ indicati ng the

oven is in cool down mode.

B. Temperature display flashes 60°F (defaul t)

or the last cool down temperature that was

set. C. Oven door opens (slightly). D. Cavity vent opens. E. Cavity fan(s) turn on.

WARNING

: CAVITY FAN(S) REMAIN OPERATIVE WHILE DOOR IS OPEN. USE EXTREME CAUTION AT ALL TIMES.

2. Ov en begins cooling down.

3. When the cool down temper ature is reached. A. Buzzer will sound for 10 seconds then turn

off.

B. Cavity fan(s) turn off.

: If the cool down temper ature is lowered

NOTE

after the initial cool down temperature i s reached, the cavit y fans will automatically restart to resume cooling.

4. Rotate the selector knob to a different position to exit

COOL DOWN

mode.

a. If t he oven cavity temperature is

above 302°F, water will be inject ed for one second every three seconds until the cavity temperat ure reaches 302°F.

b. After the oven cavity

temperat ure reaches 302°F, water is injec ted continuously until the cavity temperature is within 9°F of set point temperat ure then stops.

c. Buz z er sounds when the set

point temperature is reac hed.

d. Press Start/Stop key to silenc e

buzzer and turn cavity fans off.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

Programable Oven Control

This sequence of oper ation is writt en for the combi oven models that use the progr amable oven control . The three heating modes outlined below (conv ec tion, steam and combi) ar e for manual operation of the oven. The automatic cooking methods (timed, temperature probe and delta t) are then outlined.

Powering Control

1. Conditions. A. Oven connec ted to correct voltage supply

and properly grounded.

B. Oven control (CPU/display board) are

powered but not on; displ ay s and LED’s are off.

: When oven is initi ally powered, the

NOTE

buzzer sounds and the displays, LED’s and service error lights come on for several seconds then turn off.

C. Oven control configured proper ly. See

“CONFIGURA TION MODE PROGRAMMABLE CONTROL” outlined under “SERVICE PROCEDURES AND ADJUSTMENTS”.

D. Voltage t ap wire on power supply board

set to the proper machine voltage.

E. Door is properly closed but not locked and

the door handle position is closed.

1) Door handle magnet i s positioned over magnetic door reed switch (N.O.) and is closed.

F. Hi gh limit thermostats closed (manual

reset). G. Thermal fuses closed. H. Cavity vent open. I. 240VAC supplied to rel ay boar d. J. Steam generator empty. K. Water suppl y on.

2. Press the On key. A. Oven control runs a self diagnostic test.

1) “HHH” i s displayed in the t ime display.

2) Total cooking hours is displayed in the temper ature display.

3. Control passes self diagnostic test. A. Cavity temperature is displayed.

- -

B. Ti me displays “-

”.

min

C. Oven cavity lamp energized. D. Cooling fan(s) energized. E. Cavity vent motor energized.

1) Cavity vent closes. : When the ov en is turned on, the

NOTE

default conditi on of the cavity vent is closed. Pressing the Hot Air key selec ts the Hot Air mode and the Hot Air/Vent closed LED is on. Pr ess the Hot A ir key a second time to open the v ent. The Hot ai r mode is still selected but the vent closed LED goes out and vent open (lower) LED turns on. Press the Hot Air/Vent key a third time to return to initial power on conditions.

F. Door motor energiz ed.

1) Door opens (sightly) for several

seconds then closes and locks.

: Pressing the ON k ey automati c ally

NOTE

unlatches and opens the door (sightly) for 3 seconds. If door is not disengaged manually (door handle pulled out), it will automatically close. While open, all heating stops and the cavity vent opens.

a. When the door is locked, switch

2SW c loses and door motor i s de-energized. On 20 levels only, switch 6SW also closes.

b. Switch 3SW opens. On 20 l evels

only, switch 5S W al so opens.

4. Proceed to the appropriate heating mode (conv ec tion, combi or steam ) for the continuation of the sequence.

Convectio n Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. Hot air key is pressed. A. Hot Air/Vent closed LED on.

- -

B. Time LED turns on and “-

” is

min

displayed i n the tim e display.

C. Cavity set point temperature ( default) is

displayed i n the temperat ur e display then rever ts to the actual c avity temperature.

D. Steam gener ator fill solenoid is energized

until pr oper water level is reached then turns off. See “WATER LEVEL SENSORS” under “COMPONENT FUNCTION”.

E. First LED for the cooking pr ogram phase

flashes.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

3. Press the temp key to set the operating temperat ure (defaul t setting is 302°F; adjustable range is 35 to 518°F).

A. P r ess the t emperature up or down keys to

adjust the setting.

4. Start/S top key is pressed to begin the c ook ing cycle.

A. S tart/Stop LE D on. B. Convection heating el ements energized

and cycle as described under “HEATING REGULATION”.

C. Steam gener ator pre-heats (initial star t up

only) as described under “ST EAM PREHEAT”.

: When degree symbol shows in the

NOTE

temperat ure display, convection and/or steam generator heating elements are ener gized.

1) Drain cool down solenoid energized. : Whenever steam generator

NOTE

heating elements are on, the dr ain cool down solenoid is energized.

D. Cavity f an motor(s) energized.

5. Ov en c ontrol monitors cavity t emperature and cycles the convection heati ng elements as necessary, to maintain set poi nt temperat ur e.

6. Start/Stop key is pressed to end cooking cycle. A. S tart/Stop LE D off. B. Convection heating el ements de-

energized. C. Cavity f an motor(s) de-energized. D. Convec tion mode remains selected with

LED on.

C. Steam gener ator fill solenoid is energized

until pr oper water level is reached then turns off. See “WATER LEVEL SENSORS” under “COMPONENT FUNCTION”.

D. First LED for the cooking program phase

flashes.

3. Press the temp key to set the operating temperat ure. The default tem perature displayed (195 t o 212°F) is pre-selected in the confi gur ation mode and is the steam temperat ure setting (boi ling point adjustment) for el evation. The adjustable operating range is 35 to 212°F. See “CONFIGURATION MODE PROGRAMMABLE CONTROL” under “SEQUENCE OF OPERATION”.

A. P r ess the t emperature up or down keys to

adjust the setting.

4. Start/S top key is pressed to begin the c ook ing cycle.

A. S tart/Stop LE D on. B. S team generator heating elements

energized and cycle as described in “STEAM MODE” under “STEAM REGULATION”.

: When degree symbol shows in the

NOTE

temperat ure display, steam generator heating element s are ener gized.

1) If oven cavity temperature is below set point temperature, the steam generator heating elements t ur n on at full power until steam temper ature is reached, then turn off .

a. Drain cool down solenoid

energized. E. Cavity vent remains closed. F. The oper ating tem perature remains as

entered unless the heating mode or operating temperature sett ing is changed or the oven is turned of f.

Steam Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. Steam key is pressed.

- -

A. S team LED turns on and “-

” is

min

displayed i n the tim e display.

B. Cavity set point temperature (default) is

displayed i n the temperat ur e display then rever ts to the actual c avity temperature.

5. Ov en c ontrol monitors cavity t emperature and

6. Start/S top key is pressed to end the cooking

Page 46 of 68

: Whenever steam generator

NOTE

heating elements are on, the dr ain cool down solenoid i s energized.

2) If oven cavity temperature is above set point temperature, the oven performs an automatic cool down as described under “WATER INJECTION (HUMIDIFIER)”, then the steam generator heating elements turn on.

C. Cavity f an motor(s) energized.

cycles the steam generator heating elements as necessary, to maintain set point temperature.

cycle.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

A. S tart/Stop LE D off. B. S team generator heating elements de-

energized. C. Cavity f an motor(s) de-energized. D. Steam mode remains selected with LED

on. E. Cavity vent remains closed. F. The oper ating tem perature remains as

entered unless the heating mode or

operating temperature sett ing is changed

or the oven is turned of f.

Combi Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. Combi key is pressed.

- -

A. Combi LED i s on and “-

” is

min

displayed i n the tim e display.

B. Cavity set point temperature (default) is

displayed i n the temperat ur e display then rever ts to the actual c avity temperature.

C. Press combi k ey an additional 1 to 5 tim es

to increase the steam factor setting from 10 to 50. With each successive key press, an additional LED illuminates to indicate the setting. The default steam f actor setting is 5 (one LE D on) .

D. Steam gener ator fill solenoid is energized

until pr oper water level is reached then turns off. See “WATER LEVEL SENSORS” under “COMPONENT FUNCTION”.

E. First LED for the cooking pr ogram phase

flashes.

3. Press the temp key to set the operating temperat ure (defaul t setting is 302°F; adjustable range is 35 to 518°F).

A. P r ess the t emperature up or down keys to

adjust the setting.

4. Start/S top key is pressed to begin the c ook ing cycle.

A. S tart/Stop LE D on. B. Convection heating el ements energized

and cycle as described under HEATING REGULATION”.

C. Steam gener ator pre-heats (initial star t up

only) as described under “ST EAM PREHEAT”.

: When degree symbol shows in the

NOTE

temperat ure display, convection and/or steam generator heating elements are ener gized.

1) Drain cool down solenoid energized. : Whenever steam generator

NOTE

heating elements are on, the dr ain cool down solenoid is energized.

D. Cavity f an motor(s) energized.

5. Ov en c ontrol monitors cavity t emperature and cycles the convection heati ng elements as necessary, to maintain set poi nt temperat ur e. Steam generator heat ing elements cycle as described in “COMBI MODE” under “STEAM REGULATION”.

6. Start/S top key is pressed to end the cooking cycle.

A. S tart/Stop LE D off. B. Convection and steam generator heating

element s de-ener gized. C. Cavity f an motor(s) de-energized. D. Combi mode remains selected with LED

on. E. Cavity vent remains closed. F. The oper ating tem perature remains as

entered unless the heating mode or

operating temperature is changed or the

oven is turned off.

Automatic Operation

Add the steps outlined in the three c ook ing methods (time, temperature probe or Delta T) below to the heating m ode sequence ( c onvection, steam or combi) for automatic oven operation.

TIME METHOD

: Assume heati ng mode and operational

NOTE

temperat ure already select ed.

1. Press the time key before pr essing t he Start/S top key.

- -

A. Time LED turns on and “-

displayed i n the tim e display.

2. Press the time up or down keys to adjust the desired cooking time.

3. Press the Start/ S top key to begin t he c ook ing cycle.

A. S tart/Stop LE D on. B. Convection and/or steam gener ator

heating elements energized. C. Cavity f an motor(s) energized. D. Timer counts down.

: Time can be adjusted thr oughout the

NOTE

cooking cycle by pressing the up or down time keys. The adjusted time is retained in memory and is displayed when the time key is pressed.

” is

min

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

4. Cooking ti me expi r es. A. B uz z er sounds for approximatel y 10

seconds on and 45 seconds off. T he buzzer continues to cycle at these times until the Start/S top key is pressed.

B. Convection and/or steam gener ator

heating elements de-energiz ed.

C. Cavity f an motor(s) remain energiz ed.

5. Press the Start/ S top key to end the cooking cycle.

A. S tart/Stop LE D off. B. Buzzer off. C. Cavity f an motor(s) de-energized. D. Time method remains selected with time

LED on.

E. The cooking time rem ains as entered

unless the heating mode or cooking t ime is

changed or the oven is turned off. TEMPERATURE PROBE METHOD Refer to the Installation & Operat ion Manual for an

explanat ion of temperature probe c ook ing.

: Assume heati ng mode already selec ted.

NOTE

: Temper ature probe met hod c an be used i n

NOTE

conjunction with the Delta T method to co-ordinate the ov en c avity and probe temper atures.

1. Press the probe key bef or e pr essing t he

Start/S top key. A. P r obe LE D on.

A. B uz z er sounds for approximatel y 10

seconds on and 45 seconds off. T he buzzer continues to cycle at these times until the Start/S top key is pressed.

B. P r obe temperatur e flashes in the t ime

display.

C. Convec tion and/or steam generator

heating elements de-energiz ed.

D. Cavity f an motor(s) remain energiz ed.

5. Press the Start/ S top key to end the cooking cycle.

A. S tart/Stop LE D off. B. Buzzer off. C. Cavity f an motor(s) de-energized. D. Probe met hod remains select ed with probe

Led on.

E. P r obe temperatur e r emains as entered

unless the heating mode or operating temperat ure is changed or the oven is

turned off. DELTA T METHOD Refer to the Installation & Operat ion Manual for an

explanat ion of Del ta T cooking.

: Assume heati ng mode already selec ted.

NOTE

: Delta T method is used in conjunction wit h

NOTE

temperat ure probe to co-ordi nate the ov en c avity and probe temperatures. Oven cavity temperature will always lead probe temperature by the Delta T differenti al setting.

B. P r obe set point temperature is displ ay ed in

the time display for 5 seconds, before rever ting to actual probe tem per ature (defaul t is 140°F; range is 70-210°F).

: Probe temperature will display a maximum

NOTE

of 210°F or 2°F lower than t he c avity temperature.

: If the probe temperature is not displ ay ed,

NOTE

see “TROUBLESHOOTING” section for det ails.

2. Press the temp up or down keys to set t he final product temperature.

3. Press Start/Stop key to begin t he c ook ing cycle.

: The probe temperature can be adjusted

NOTE

throughout the cooking cycle by pressing the up or down time key s. The adjusted tem per ature is retained i n memory and is displayed when the time key is pressed.

A. S tart/Stop LE D on.

4. Internal product temperature reaches probe set point temperature.

1. Press Delta T key ( differential) before pressing the Start/Stop key.

A. Delta T and probe LED’s on. B. P r obe set point temperature is displ ay ed in

the time display for 5 seconds, before rever ting to actual probe tem per ature (defaul t is 140°F; range is 70-210°F).

: Probe temperature will display a

NOTE

maximum of 210°F or 2°F lower than the c avity temperature.

: If the probe temperature is not

NOTE

displayed, see “TROUBLESHOOTING” section for details.

C. Delta T differential setting is di spl ayed in

the temper ature display for 5 seconds, before reverting to actual c avity temperat ure (defaul t is 60t; range i s 20t to 240t for hot air/combi and 20t to 180t for steam).

2. Press Delta T key.

Page 48 of 68

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

A. P r ess the t emp up or down keys to set the

Delta T differential .

3. Press probe key. A. P r ess the t ime up or down keys to set the

final product temperature.

4. Press Start/Stop key to begin t he c ook ing cycle.

: The Delt a T differenti al can not be adjusted

NOTE

without stopping and starting the cycle agai n. The Delta T differential is retained i n memory and is displayed when the Delta T key is pressed.

: The probe temperature can be adjusted

NOTE

throughout the cooking cycle by pressing the up or down time key s. The adjusted tem per ature is retained i n memory and is displayed when the time key is pressed.

A. S tart/Stop LE D on.

5. Internal product temperature reaches probe set point temperature.

A. B uz z er sounds for approximatel y 10

seconds on and 45 seconds off. T he buzzer continues to cycle at these times until the Start/S top key is pressed.

B. P r obe temperatur e flashes in the t ime

display.

C. Convec tion and/or steam generator

heating elements de-energiz ed.

D. Cavity f an motor(s) remain energiz ed.

6. Press Start/Stop key to end the heating cycle. A. S tart/Stop LE D off. B. Buzzer off. C. Delta T method rem ains selected with

Delta T and probe LE D ’s on. D. Cavity f an motor(s) de-energized. E. P r obe and Delta T temperatures rem ain as

entered unless the heating mode or set

point temperatures are changed or t he

oven is turned off.

: If time key is pressed accidently, the

NOTE

Delta T method is cancel ed and the LED turns off.

Programed Cooking Operation

Refer to the Installation & Operat ion Manual for programing instructions.

Powering Down

1. The control can be in any heating mode and the door in the open or closed position.

2. Press the off key.

: There is a four second time delay after

NOTE

pressing the off key to canc el the shut down sequence and resume normal operation.

A. Displays and LED’s turn off. B. A ll power removed f rom the heating

element s and cavit y fan(s).

C. Vent motor energized and operat es t ill

vent opens. D. Door unlocks and opens. E. Dr ain pump activated for 45 seconds on 6

and 10 levels; 60 seconds on 20 levels.

3. At the end of the drain cycle. A. Cavity lamp de- ener gized. B. Cooling f an( s) de- ener gized.

Manual Oven Controls

This sequence of oper ation is writt en for the combi oven models that use the del uxe manual or standard manual oven contr ols. Control features that are not control, are indicat ed where the differences occur. The three heating modes outlined below (conv ec tion, steam and combi) ar e for manual operation of the oven. The ti med and temper ature probe cooking methods are then outl ined.

Powering Control

1. Conditions.

available on the standar d manual

A. Oven connec ted to correct voltage supply

and properly grounded.

B. Oven control (CPU/display/keypad boar d)

are powered but not on; di spl ay s and LED’s are off.

: When oven is initi ally powered, the

NOTE

buzzer sounds and the displays, LED’s and servi ce error li ghts come on for three seconds then turn off.

C. Oven control configured proper ly. See

“CONFIGURA TION MODE - MANUAL CONTROLS” out lined under “SERVICE PROCEDURES AND ADJUSTMENTS”.

D. Voltage t ap wire on power supply board

set to the proper machine voltage.

E. Door is properly closed but not locked and

the door handle position is closed.

1) Door handle magnet i s positioned over magnetic door reed switch (N.O.) and is closed.

F. Hi gh limit thermostats closed (manual

reset).

G. Thermal fuses closed.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

H. Cavity vent open. I. 240VAC supplied to rel ay boar d. J. Steam generator empty. K. Water suppl y on.

2. Rotate the selector knob to one of the cooking modes (Heat, Steam or Combi) to tur n the oven on.

A. Oven control runs a self diagnostic test.

1) “HHH” i s displayed in the t ime display.

2) Total cooking hours is displayed in the temper ature display.

3. Control passes self diagnostic test. A. S et point temperature is displayed (default

or last temperature that was set).

B. Ti me displays “ - -:- - ” and time Led tur ns

on. C. Oven cavity lamp energized. D. Cooling fan(s) energized. E. Cavity vent motor energized.

1) Cavity vent closes. : When the ov en is turned on, the

NOTE

default conditi on of the cavity vent is closed. Pressing the V E NT key opens the cavity vent and turns the Vent LE D on. Pressing the VENT k ey a second t ime closes the cavity vent and turns t he vent LED off. Vent key is present on deluxe manual controls only.

F. Door motor energiz ed.

1) Door closes and locks.

a. When the door is locked, switch

2SW c loses and door motor i s de-energized. On 20 levels only, switch 6SW also closes.

b. Switch 3SW opens. On 20 l evels

only, switch 5S W al so opens.

: Pressing the DOOR key

NOTE

automatically unlatches and opens the door (sightl y ) for 3 seconds. If door is not disengaged manually (door handle pulled out), it will automatically close. While open, all heating stops and the cavity vent opens.

g. Steam generator fill solenoid is energized

until pr oper water level is reached then turns off. See “WATER LEVEL SENSORS” under “COMPONENT FUNCTION”.

4. Proceed to the appropriate heating mode (conv ec tion, combi or steam ) for the continuation of the sequence.

Convectio n Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. With the select or knob rotated to HE A T, the cooking cycle begins.

A. Time LED is on and “- -:- - “ is displayed in

the time display.

B. Cavity set point temperature (t he last

temperat ure that was set) is displayed i n the temper ature display.

C. Convec tion heating elements energi zed

and cycle as described under “HEATING REGULATION”.

D. Steam gener ator pre-heats (initial star t up

only) as described under “ST EAM PREHEAT”.

: When degree symbol shows in the

NOTE

temperat ure display, convection and/or steam generator heating elements are ener gized.

1) Drain cool down solenoid energized. : Whenever steam generator

NOTE

heating elements are on, the dr ain cool down solenoid is energized.

E. Cavity fan motor(s) energiz ed.

3. Press the temp key to set the operating temperat ure (the last temperature that was set is displayed; adjustable range is 35 to 518°F). The temper ature symbol ( °F or °C) will flash in the temper ature display t o indicate t he c avity set point temperature can be adjusted.

A. Rotate the adjustment knob cloc kwise or

counterclockwise to adjust the setting (temperature symbol stops flashing).

B. If a pause of 5 seconds is made during or

at the end of the adjustment , the temperature symbol will begin to fl ash. When the temperat ur e symbol stops flashi ng, the temperature can no longer be adjusted and the cavity set point temperat ure is displayed.

: To display the actual c avity

NOTE

temperat ure for several seconds, press and hold the temperature key.

4. Ov en c ontrol monitors cavity t emperature and cycles the convection heati ng elements as necessary, to maintain set poi nt temperat ur e.

A. The operating temperature remains as

entered unless the operating temperature setting is changed.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

Steam Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. With the select or knob rotated to S TEAM, the cooking cycle begins..

A. Time LED is on and “- -:- - “ is displayed in

the time display.

B. Cavity set point temperature (default) is

displayed i n the temperat ur e display. If the oven has not been t ur ned off, the previous set point temperature i s di spl ay ed.

C. W ith the water at t he proper level in the

steam generator , steam generator heating element s are energized and cycle as described in “STEAM MO DE” under “STEAM REGULATION”.

: When degree symbol shows in the

NOTE

temperat ure display, steam generator heating element s are ener gized.

1) If oven cavity temperature is below set point temperature, the steam generator heating elements t ur n on at full power until steam temper ature is reached, then turn off .

D. Drain cool down solenoid energized.

: Whenever steam generator heating

NOTE

element s are on, the drain cool down solenoid is energized.

E. Cavity fan motor(s) energiz ed.

3. Press the temp key to set the operating temperat ure. The temperature symbol (°F or °C) will flash in the temperature display to indicat e the cavity set point temperat ur e c an be adjusted. The default t emperature displayed (195 to 212°F) is pre-selected in the confi gur ation mode and is the steam temperat ure setting (boi ling point adjustment) for el evation. The adjustable operating range is 35 to 212°F. See “CONFIGURATION MODE MANUAL CONTRO LS ” under “S E QUENCE OF OPERATION”.

A. Rotate the adjustment knob cloc kwise or

counterclockwise to adjust the setting (temperature symbol stops flashing).

1) If a pause of 5 seconds is m ade during or at the end of the adjustment , the temperature symbol will begin to flash. When the temperat ure symbol stops f lashing, the temper ature can no longer be adjusted and the cavity set point temperat ure is displayed.

: To display the actual c avity

NOTE

temperat ure for several seconds, press and hold the temperature key.

4. Ov en c ontrol monitors cavity t emperature and cycles the steam generator heating elements as necessary, to maintain set point temperature.

A. The operating temperature remains as

entered unless the operating temperature setting is changed or the oven is turned off.

Combi Mode

1. Conditions exist as described in “POWERING CONTROL”.

2. With the select or k nob rotated to COMB I, the cooking cycle begins.

A. Time LED is on and “- -:- - “ is displayed in

the time display.

B. Cavity set point temperature (t he last

temperat ure that was set) is displayed i n the temper ature display.

C. Deluxe M anual Control

- COMBI key LED turns on and 3 LED’s in the combi window turn on, indicating t he default steam factor setting of 20.

1) Press COMB I key an additional 1 to 3

tim es to increase the steam factor setting from 30 to 50. Wi th each successive key pr ess, an addi tional LED illuminates to indicate the setting. This will be the “new” default combi setting until manual ly changed.

D. Standard Manual Control

- A fixed steam factor setting of 20 is used. The combi key and the combi window are not

present on

this control.

E. Convection heating el ements energized

and cycle as described under “HEATING REGULATION”.

F. St eam generator pre- heats (initial start up

only) as described under “ST EAM PREHEAT”.

: When degree symbol shows in the

NOTE

temperat ure display, convection and/or steam generator heating elements are ener gized.

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

1) Drain cool down solenoid energized. : Whenever steam generator

NOTE

heating elements are on, the dr ain cool down solenoid is energized.

G. Cavity fan motor(s) energized.

A. Rotate the adjustment knob cloc kwise or

counterclockwise to adjust the setting (temperature symbol stops flashing).

: To display the actual c avity

NOTE

temperat ure for 5 seconds, press and hold the temperat ure key.

A. Once the time is set, it will flash in the

tim e display for 5 seconds then display the selected time.

3. Press the Start key to begin the “timed” cooki ng cycle.

A. S tart LED on. B. Timer c ounts down.

: As the cooki ng time counts down, the

NOTE

colon between hours and minutes in the time display will flash.

: Time can be adjusted thr oughout the

NOTE

cooking cycle by pressing the time key and rotating the adjustment knob. The adjusted tim e is retained i n memory and is displayed when the time key is pressed.

4. Cooking ti me expi res, tim e display flashes and buzzer sounds.

A. P r ess the Start key to silence buzzer.

1) St ar t LED off.

5. The cooking time remains as entered and is displayed i n the tim e display.

TEMPERATURE PROBE METHOD (DELUXE MANUAL CONTRO L ONLY)

4. Ov en c ontrol monitors cavity t emperature and cycles the convection heati ng elements as necessary, to maintain set poi nt temperat ur e. Steam generator heat ing elements cycle as described in “COMBI MODE” under “STEAM REGULATION”.

A. The operating temperature remains as

entered unless the operating temperature is changed.

Add the steps outlined in the two cooki ng methods below to the heating mode sequence (convection, steam or combi) for time and temperat ur e pr obe operation.

TIME METHOD

: Assume heati ng mode and operational

NOTE

temperat ure already select ed.

: Timed method can not be used in

NOTE

conjunction with tem per ature probe method.

: Timed method does not affect oven

NOTE

operation. i.e. contac tors, heaters, cavity fans etc.

1. Press the time key. A. Time LED and dashes ( - -:- - ) flash in the

time display.

2. Rotate the adj ustment knob clockwise or counterclockwise to the desired cooking tim e. Time display will be continuous but the time LED will continue to flash.

Refer to the Installation & Operat ion manual for an explanat ion of temperature probe c ook ing.

: Assume heati ng mode already selec ted.

NOTE

: Temper ature probe met hod c an not be used

NOTE

in conjunction with timed m ethod.

: Timed method does not affect oven

NOTE

operation. i.e. contac tors, heaters, cavity fans etc.

1. Press the probe key. A. Time LED off. B. P r obe LE D and dashes ( - -:- - F ) flash in

the time display.

C. Probe set point temperature is displayed in

the time display (the last tem per ature that was set). Default is 140°F; range is 70210°F.

: Probe temperature will display a maximum

NOTE

of 210°F or 2°F lower than t he c avity temperature.

: If the probe temperature is not displ ay ed,

NOTE

see “TROUBLESHOOTING” section for det ails.

2. Rotate the adj ustment knob clockwise or counterclockwise to adjust the setting (temperature display will not flash).

A. Once the adjustment is made, the

temperat ure display flashes for 5 seconds then displays the sel ec ted set point temperature.

Page 52 of 68

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

: To display the actual pr obe temperature

NOTE

for 5 seconds, press and hold the pr obe k ey .

3. Press Start key to begin the cooking cycl e.

Powering Down

1. The control can be in any heating mode and the door in the open or closed position.

A. S tart LED on.

: The probe temperature can be adjusted

NOTE

throughout the cooking cycle by pressing the probe key and rotating the adjustment. The adj usted temperat ure is retained in memor y and is displayed when the time key is pressed.

4. Internal product temperature reaches probe set point temperature.

A. B uz z er sounds.

1) Press the Start key to silence the buzzer.

a. Start LED off.

B. P r obe temperatur e flashes in the t ime

display.

C. Probe met hod remains select ed with probe

Led on.

D. Probe tem perature remains as entered

and is displayed in the time display.

2. Rotate the selector knob to of f. : There is a 5 second time delay after

NOTE

selecting the off position to canc el the shut down sequence and resume normal operation.

A. Displays and LED’s turn off. B. A ll power removed f rom the heating

element s and cavit y fan(s).

C. Vent motor energized and operat es t ill

vent opens. D. Door unlocks and opens. E. Dr ain pump activated for 45 seconds on 6

and 10 levels; 60 seconds on 20 levels.

3. At the end of the drain cycle. A. Cavity lamp de- ener gized. B. Cooling f an( s) de- ener gized. C. Cavity vent closes.

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Page 54

6 Level

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

WIRING DIAGRAMS

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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Page 56

10 Level

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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Page 58

20 Level

ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

ELECTRIC HEATER CIRCUITS

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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ELECTRIC COMBI OVEN - ELECTRICAL OPERATION

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Page 63

ELECTRIC COMBI OVENS - TROUBLESHOOTING

TROUBLESHOOTING

WARNING:

Before performing any of the troubleshooting checks listed below, run the o ven control in “DIAGNOSTIC TEST MO DE” for the oven control in use, as outlined under “SERVICE PROCEDURES AND ADJUSTMENTS”. By utilizing the oven controls “diagnostic test mode” the Service Technician can quickly and easily determine if a component is functioning properly or in need of repair. The “diagnostic test mode” can be entered only when the machine is OFF. If the oven is inoperative, then refer to the troubleshooting guide under SYMPTOM - “Oven inoperative and displays are blank” and/or SYMPTOM “Button(s) on keypad inoperative”. Also, check the Techni cal Service Bull et ins and for so ftware revisio ns to the oven control .

NOTE

oven control. Li me scale that is dry can prevent the sensor from detecti ng the water level until the li me becomes moist enough t o conduct the elec trical si gnal. This condition can cause water error s and/or overfilling of the steam generator . In reverse, lime scale that retains water may al r eady be moist enough t o c onduc t the electr ical signal. This conditi on c an c ause water error s, pr event t he steam generator from filling and cause dry firing of the heating elements. Subsequentl y , the steam generat or s ther mal fuse(s) would open to protect t he oven. See “CLEAN CYCLE MODE - S TEAM GENERAT OR DELIMING” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR

for chang es to the oven

: An accum ulation of lime scale on the water l evel sensors may c ause false water level readings to the

SYMPTOM POSSIBLE CAUSES

Water error light on, buzzer sounds f or one minut e and steam generator light comes on in a cooking mode.

Water error light on and buzzer sounds aft er steam generator dr ains.

Water error light on and buzzer sounds when oven is tur ned on.

Steam generation stops, water error light and steam generator light on i n steam mode.

1. Time to fill steam generator has exceeded 4 minutes 20 seconds.

A. E nsure water suppl y is on. B. Check water fill line for clogs.

2. Water too soft for water level sensors to conduct electricity.

3. Lime scale build up (dry ) on water level sensors givi ng a false reading to the oven control. See note at the beginning of troubleshooting section.

1. Water still in steam generator - check for clogged steam generator drai n line or drai n pump mal functi on.

2. Lime scale build up (moist) on water level sensors giving false reading. See note at t he beginning of troubleshooting section.

1. Water still in steam generator - check for clogged steam generator drai n line or drai n pump mal functi on.

2. Lime scale build up (moist) on water level sensors giving false reading. See note at t he beginning of troubleshooting section.

1. Ov en c ontrol board has not seen a call for water request within 5 minutes powering on. A boil down situation is assumed.

A. Lime scale build up on water level sensors giving

false reading. See note at t he beginning of troubleshooting section.

B. Oven control board m alfunct ion.

Page 63 of 68

Page 64

ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

Convection heat error light and steam heat error light on.

Cavity fan motor inoper ative and cavity f an error light on.

Ov en inoperative and displays are blank. 1. Incoming voltage to m ac hine not present or inc or r ec t.

1. Cavity high temperature l imi t(s) open (manual r eset) .

2. Fuse F7 open.

3. Steam generator therm al fuse(s) open.

1. Cavity fan motor values in the oven contr ol configuration setup are incorrec t. See “CONFI GURATION MO DE PROGRAMABLE CONTROL” or “CONFIGURATION MODE MANUAL CO NTROLS” in “SERVICE PROCEDURES”AND ADJUSTMENTS”.

2. Motor shaft is rubbing against the opening in the r ear of the cavity.

: This may only occur when the cavity is at a high

NOTE

temperat ure. If this is true, then remove the motor and inspect the shaft for scratches.

3. Internal motor prot ec tor open.

4. Fuse F7 on relay boar d open.

5. Cavity high temperature l imi t(s) open (manual r eset) .

6. Steam generator therm al fuse(s) open.

7. Auxiliary contactor switch(s) on contactor KM1 or KM2 malfunction.

8. Cavity fan motor(s) m alfunct ion.

9. Ov en c ontrol malfunct ion.

2. Line fuses F8 and/or F9 open.

3. Voltage tap wi r e on power supply boar d not connected to wrong voltage for the machine.

4. Fuse F1 and/or F2 on the power supply board open.

5. Ribbon cable connec tor to relay boar d and CP U boar d is not inserted proper ly. position.

6. Relay board connector (J6) and/or power supply board connector is not inserted properly.

7. Battery backup vol tage low or near zero.

8. Power supply board and transf or mer (1T) malf unc tion.

9. Ov en c ontrol board i noper ative.

: Connector should snap i nto

NOTE

connected or

One or more servic e er r or light(s) at bottom of keypad come on.

Convection heaters inoper ative. 1. No voltage to heati ng elements.

1. Water supply not on or clogged.

2. Convection heat m alfunct ion.

3. Steam generator heat malfunction.

4. Cavity fan malfunction.

A. Cavity high temperature limit (s) open (manual reset) . B. S team generator thermal fuse(s) open. C. Contactor(s) malfunction. See “HEATING MODE

AND CAVITY FAN SPEEDS” under “ELECTRICAL OPERATION”.

2. Convection heating element(s) malfunction.

3. Relay board malfunction (K6, K7 relay)

4. Ov en c ontrol board malfunction.

Page 64 of 68

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ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

No steam generation but cavity fan operates.

Ov en displays “888F” or “888C” in the temperat ure display.

1. Cavity tem per ature is above steam temperature set point and oven is perform ing automatic cooling before steam generation can star t.

2. Water supply off.

3. Steam generator therm al fuse(s) open.

4. Steam generator heating element(s) malfunc tion.

5. Contactor(s) malf unc tion. See “HEATING MODE AND CAVITY FAN SPEEDS” under “ELECTRICAL OPERATION”.

6. Lime scale build up (moist) on water level sensors giving false reading. See note at t he beginning of troubleshooting section.

7. Ov en c ontrol board malfunction.

1. Cavity tem per ature probe.

: On 10 level machines - error in the single cavity

NOTE

temperat ure probe. On 20 level machines - error in the upper cav ity temperature probe.

A. Damaged probe or thermocouple l ead wir e open. B. B oar d c onnection loose or connec tor not inserted

onto board properl y ( mis-aligned).

C. Thermocouple lead wires reversed. When heating,

cavity temperature will appear to decrease for several seconds, then error code will display.

2. Low or no voltage on battery back up to maint ain controls setup and program information in S RA M . See “BATTERY BACKUP - PROGRAMMABLE CONTROL” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

3. Incorrect temperature pr obe in use. Ensure the temperat ure probe is not resistance. If resistance measures approxim ately 110 ohms at 70-80°F then do not

a thermistor type by check ing its

use.)

Ov en displays “999F" or “999C" in the temperat ure display.

1. Cavity tem per ature probe.

: On 10 level machines - error in the single cavity

NOTE

temperat ure probe. On 20 level machines - error in the lower cavity temperature probe.

A. Damaged probe or thermocouple l ead wir e open. B. B oar d c onnection loose or connec tor not inserted

onto board properl y ( mis-aligned).

C. Thermocouple lead wires reversed. When heating,

cavity temperature will appear to decrease for several seconds, then error code will display.

2. Low or no voltage on battery back up to maint ain controls setup and program information in S RA M . See “BATTERY BACKUP - PROGRAMMABLE CONTROL” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

3. Incorrect temperature pr obe in use. Ensure the temperat ure probe is not resistance. If resistance measures approxim ately 110 ohms at 70-80°F then do not

Page 65 of 68

a thermistor type by check ing its

use.)

Page 66

ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

Temperat ure display for cav ity or cooking probe does not change aft er starting a cook cycle.

Cooking probe temperature di spl ay s “32” in the time display. After appr oxim ately 10 minutes, “00"or “32” flashes and the buzzer sounds intermittentl y . Ov en will not operate in probe mode.

Temperat ure display flashes current cavity temperature but oven will not heat or produce steam.

1. Cavity tem per ature probe (thermocouple) shorted.

2. Ov en c avity not heating - c heck incom ing voltage.

3. Contactor(s) malf unc tion. See “HEATING MODE AND CAVITY FAN SPEEDS” under “ELECTRICAL OPERATION”.

4. Heating element(s) inoper ative.

1. Product temperature i s bel ow 35°F. Once product warm s, correct temperature will display.

2. Cooking probe. A. Damaged probe or thermocouple l ead wir e open. B. B oar d c onnection loose or connec tor not inserted

onto board properl y ( mis-aligned).

C. Thermocouple lead wires reversed. When heating,

cavity temperature will appear to decrease for several seconds, then “32" will display.

3. Incorrect c ook ing probe in use. Ensure the cook ing probe

a thermistor type by check ing its resistance. If

is not resistance measures approximat ely 110 ohms at 70-80°F then do not

1. Door not completely shut or handle not in the c losed position.

2. Door reed switch malfunct ion.

3. Ov en c ontrol board malfunction.

use.)

Cavity cooking temperature is lower than actual temperature displayed.

Button(s) on keypad inoperative (programmable contr ol).

1. Cavity tem per ature probe(s) (thermocouple) shorted.

2. Incorrect temperature pr obe in use. A. Cavity thermoc ouple not B. E nsure t he temperatur e pr obe is not

type by checking its resistance. If resistance measures approximatel y 110 ohms at 70-80°F then do not use.

3. Software revisi on level not current. Determine the current versi on and obtain an update if availabl e. See “CONFIGURATION MODE - PROGRAMABLE CONTROL” or “CO NFIGURATI ON MODE - MANUAL CONTROLS” under “S E RV ICE PROCEDURES”AND ADJUSTMENTS”.

1. Display/Key pad board malfunction. V erify keypad is functioning properly. See “DIAGNOSTIC TEST MO DE” - PROGRAMABLE CONTROL” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

2. If key pad test is inaccessibl e, the ov en c ontrol board m ay not be properly mounted to the front panel . If the mounti ng washers are stacked too high or the weld studs have excessive flash, the oven contr ol board will be positioned to far f rom the keypad to actuate the buttons when pressed.

the correct type.

a thermistor

Page 66 of 68

Page 67

ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

Heating m ode selector switch, adjustment knob or keypad button(s) inoperative (manual control).

Door will not lock. 1. Door handle magnet not positioned over door reed switch.

“HHH” in the time displ ay and “025” i n the temperat ure display. (P r ogr amable contr ol only)

1. Display/Key pad/CPU board malfunction. Verify keypad is functioning properly. See “DIAGNOSTIC TEST MO DE MANUAL CONTRO LS ” under “S E RV ICE PROCEDURES AND ADJUSTMENTS”.

2. Door reed switch open. (Check switc h operation with an alternate magnet)

3. Fuse F3 open.

4. Relay board malfunction (K1 relay).

5. Door motor & switch mechani sm inoperati ve.

6. Motor stop m ec hanism remains in the open position.

1. Low or no voltage on battery back up to maint ain the oven control’s setup and program inf or mation in the ev ent of a power loss. See “BATTERY BACKUP - PROGRAMABLE CONTROL” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

Water in com ponent area. 1. Cavity drain “gasket” not sealing properly.

2. Heating element(s) “o-ring” not sealing properly.

Water in bottom of cavity. 1. Water too soft for water level sensors to conduct

electricity.

2. Water level sensor leads loose or disconnected.

3. Lime scale build up on water l evel sensors giving false reading. See not e at the beginning of troubl eshoot ing section.

4. Excessive li me descale solution added to steam generator for cl ean cycle deliming. The increased concentration interferes with water level sensing and causes the steam generator to overfill.

5. Drain line clogged causing back up.

6. Water solenoid valve remains open.

7. Relay board malfunction (K3, K5 relay).

8. Water level sensor(s) mal functi on.

9. Ov en c ontrol board malfunction.

Cavity vent not operating. 1. Vent motor not rec eiving voltage.

A. M otor leads loose or disconnected. B. Relay board malfunction (K2 relay ) .

2. Vent mot or /mic r o switc h assembly (4SW) malfunction.

3. Mechanical binds on shaft extension rod or obstruct ions in vent housi ng.

4. Shaft extension rod not turning with motor. Mount ing screw missing in rod.

5. Ov en c ontrol board malfunction.

Page 67 of 68

Page 68

ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSES

Inner door glass breaks. 1. Glass install ed incorrectly with conductive si de toward

oven cavity. See “OVEN DOOR” under “REMOVAL AND REPLACEMENT OF PARTS”.

Steam generator drains continually. 1. Relay boar d malfunction (K3, K5).

2. Ov en c ontrol board malfunction.

Cavity fan motor squeaks. 1. M otor seal - grease is dry or dirty.

2. Motor shaft rubbing against t he opening in the rear of the cavity.

: This may only occur when the cavity is at a high

NOTE

temperat ure. If this is true, then remove the motor and inspect the shaft for scratches..

3. Motor malfunct ion.

Cavity lamp not working. 1. Lamp inoperative.

2. Power wires to lamp loose or not connected to transformer (1T).

3. Transformer (1T) malf unc tion.

4. Relay board malfunction (K3 relay).

5. Ov en c ontrol board malfunction.

Steam leaks around door. 1. Door not sealing or locking properly. See “OVEN DOOR

ADJUSTMENT” under “SERVICE PROCEDURES AND ADJUSTMENTS”.

Form 24659 (S eptember 1999) Printed in USA

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

Specifications and Main Features

Frequently Asked Questions

User Manual