Middleby Marshall 60254 User Manual

PS740 Series
Electric
Domestic & Std. Export
ENGLISH

P/N 60254

September 28, 2012

PS740 Series Electric Ovens

Model:

• PS740EElectric

Combinations:

• SingleOven

• DoubleOven(Two-Stack)

• TripleOven(Three-Stack)

OWNER'S OPERATING AND
INSTALLATION MANUAL

for domestic and standard export ovens

©2012 Middleby Marshall Inc.

is a registered trademark of Middleby Marshall, Inc. All rights reserved.

Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • [phone] • FAX [phone]

NOTICE:

This Owner's Operating and Installation Manual should be given to the user. The operator of the oven should be

familiar with the functions and operation of the oven.

This manual must be kept in a prominent, easily reachable location near the oven.

It is suggested to obtain a service contract with a Middleby Marshall Authorized Service Agent.

WARNING

FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS

AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.

WARNING

Improper installation, adjustment, alteration, service, or maintenance can cause

property damage, injury, or death. Read the installation, operation, and maintenance instruc-

tions thoroughly before installing or servicing this equipment.

IMPORTANT

An electrical wiring diagram for the oven is located inside the machinery compartment.

IMPORTANT

It is the customer’s responsibility to report any concealed or non-concealed damage to the

freight company. Retain all shipping materials until it is certain that the equipment has

not suffered concealed shipping damage.

NOTICE

CONTACT YOUR MIDDLEBY MARSHALL AUTHORIZED SERVICE AGENT TO PERFORM MAIN-

ENANCE AND REPAIRS. AN AUTHORIZED SERVICE AGENCY DIRECTORY IS

SUPPLIED WITH YOUR OVEN.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts relieves the

manufacturer of all warranty and liability.

NOTICE

Middleby Marshall (Manufacturer) reserves the right to change specications at any time.

NOTICE

The equipment warranty is not valid unless the oven is installed, started and demonstrated under the

supervision of a factory certied installer.

NOTICE

A Middleby Marshall certied installer must be used to install and service this appliance.

NOTICE

This equipment is only for professional use and shall be used by qualied people.

RETAIN THIS MANUAL FOR FUTURE REFERENCE.

Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 USA • [phone] • FAX [phone]

www.middleby.com

IIP/N60254September28,2012

Model No.
Modéle No.

Serial No.
Serié No.

Installation Date
Date d'installation

MIDDLEBY MARSHALL

No Quibble limited WarraNty

(U.S.A. Only)

MIDDLEBY MARSHALL, HEREINAFTER REFERRED TO
AS “THE SELLER”, WARRANTS EQUIPMENT MANUFAC­TURED BY IT TO BE FREE FROM DEFECTS IN MATERIAL
AND WORKMANSHIP FOR WHICH IT IS RESPONSIBLE.
THE SELLER’S OBLIGATION UNDER THIS WARRANTY
SHALL BE LIMITED TO REPLACING OR REPAIRING,
AT SELLER’S OPTION, WITHOUT CHARGE, ANY PART
FOUND TO BE DEFECTIVE AND ANY LABOR AND MATE­RIAL EXPENSE INCURRED BY SELLER IN REPAIRING
OR REPLACING SUCH PART. SUCH WARRANTY SHALL
BE LIMITED TO THE ORIGINAL PURCHASER ONLY
AND SHALL BE EFFECTIVE FOR A PERIOD OF ONE
YEAR FROM DATE OF ORIGINAL INSTALLATION, OR 18
MONTHS FROM DATE OF PURCHASE, WHICHEVER IS
EARLIER, PROVIDED THAT TERMS OF PAYMENT HAVE
BEEN FULLY MET.

This warranty is valid only if the equipment is installed,
started, and demonstrated under the supervision of a factory-

authorized installer.

Normal maintenance functions, including lubrication, clean­ing, or customer abuse, are not covered by this no quibble
warranty.

Seller shall be responsible only for repairs or replacements of
defective parts performed by Seller’s authorized service per­sonnel. Authorized service agencies are located in principal

cities throughout the contiguous United States, Alaska, and
Hawaii. This warranty is valid in the 50 United States and

is void elsewhere unless the product is purchased through
Middleby International with warranty included.

The foregoing warranty is exclusive and in lieu of all
other warranties, expressed or implied. There are no

implied warranties of merchantability or of tness for a

particular purpose.

The foregoing shall be Seller’s sole and exclusive obliga­tion and Buyer’s sole and exclusive remedy for any action,

including breach of contract or negligence. In no event shall

Seller be liable for a sum in excess of the purchase price of

the item. Seller shall not be liable for any prospective or lost

prots of Buyer.

This warranty is effective on Middleby Marshall equip­ment sold on, or after, February 15, 1995.

MIDDLEBY MARSHALL INC.

OVEN LIMITED WARRANTY

(Non U.S.A.)

The Seller warrants equipment manufactured by it to be free from
defects in material and workmanship for which it is responsible. The

Seller’s obligation under this warranty shall be limited to replacing or

repairing, at Seller’s option, without charge, F.O.B. Seller’s factory,
any part found to be defective and any labor and material expense

incurred by Seller in repairing or replacing such part. Such warranty
is limited to a period of one year from date of original installation or

15 months from date of shipment from Seller’s factory, whichever

is earlier, provided that terms of payment have been fully met. All
labor shall be performed during regular working hours. Overtime

premium will be charged to the Buyer.

This warranty is not valid unless equipment is installed,
started, and demonstrated under the supervision of a factory­authorized installer.

Normal maintenance functions, including lubrication, adjustment of

airow, thermostats, door mechanisms, microswitches, burners and

pilot burners, and replacement of light bulbs, fuses and indicating
lights, are not covered by warranty.

Any repairs or replacements of defective parts shall be performed by
Seller’s authorized service personnel. Seller shall not be responsible
for any costs incurred if the work is performed by other than Seller’s
authorized service personnel.

When returning any part under warranty, the part must be intact

and complete, without evidence of misuse or abuse, freight prepaid.

Seller shall not be liable for consequential damages of any kind
which occur during the course of installation of equipment, or which

result from the use or misuse by Buyer, its employees or others of
the equipment supplied hereunder, and Buyer’s sole and exclusive

remedy against Seller for any breach of the foregoing warranty or
otherwise shall be for the repair or replacement of the equipment
or parts thereof affected by such breach.

The foregoing warranty shall be valid and binding upon Seller if and
only if Buyer loads, operates and maintains the equipment supplied

hereunder in accordance with the instruction manual provided to

Buyer. Seller does not guarantee the process of manufacture by
Buyer or the quality of product to be produced by the equipment

supplied hereunder and Seller shall not be liable for any prospective

or lost prots of Buyer.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF
ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSO­EVER. SPECIFICALLY THERE ARE NO IMPLIED WARRANTIES
OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
PURPOSE.

The foregoing shall be Seller’s sole and exclusive obligation and
Buyer’s sole and exclusive remedy for any action, whether in breach

of contract or negligence. In no event shall seller be liable for a sum

in excess of the purchase price of the item.

© 2003 - Middleby Marshall, A Middleby Company.
The Middleby Marshall logo is a registered trademark of Middleby Marshall, A Middleby Company.

Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A. • [phone] • FAX: [phone]

III P/N60254September28,2012

TABLE OF CONTENTS

Page

SECTION 1 – DESCRIPTION ............................................ 1

I. OVEN USES ............................................................. 1

II. OVEN COMPONENTS ............................................. 1

A. Conveyor Motor Drive ................................... 1

B. Crumb Pans .................................................. 1

C. Conveyor ....................................................... 1

D. End Plugs ...................................................... 1

E. Eyebrows ....................................................... 1

F. Window .......................................................... 1

G. Machinery Compartment Access Panel ........ 1

H. Serial Plate .................................................... 1

I. Control Panel ................................................. 1

J. Photo Cell ...................................................... 1

K. Blowers .......................................................... 1

L. Air Fingers ..................................................... 1

III. OVEN SPECIFICATIONS ......................................... 2

A. Dimensions .................................................... 2

B. General Specications .................................. 2

C. Electrical Specications for

PS740 Electric Ovens ................................... 2

SECTION 2 – INSTALLATION .......................................... 3

I. BASE PAD KIT ......................................................... 4

II. INSTALLATION KIT .................................................. 6

III. VENTILATION SYSTEM ........................................ 12

A. Requirements .............................................. 12

B. Recommendations ...................................... 12

C. Other Ventilation Concerns ......................... 12

IV. ASSEMBLY ............................................................ 13

A. Base Pad, Legs, Casters ............................. 13

B. Stacking ....................................................... 14

C. Restraint Cable Installation ......................... 14

D. Conveyor Installation ................................... 15

E. Standoff Installation ..................................... 15

V. FINAL ASSEMBLY ................................................. 16

VI. ELECTRICAL SUPPLY .......................................... 17

Connection ....................................................... 17

UTILITY ROUGH-IN DIMENSIONS AND ...................

POSITIONING FOR PS840-SERIES OVENS................... 18

Circuit Breaker .................................................. 18

ElectricalSpecications.................................... 18

   ElectricalRating............................................... 18

Supply Wire ...................................................... 18

Suggested ........................................................ 18

Page

SECTION 3 – OPERATION ............................................. 19

I. LOCATION AND DESCRIPTION OF CONTROLS 19

II. NORMAL OPERATION, STEP-BY-STEP .............. 20

A. Main Screen ................................................ 20

B. Daily Startup Procedure .............................. 20

C. Daily Shutdown Procedure .......................... 20

III. QUICK REFERENCE: TROUBLESHOOTING ....... 21

IV. SCREEN ALERTS .................................................. 21

SECTION 4 – MAINTENANCE ........................................ 22

I. MAINTENANCE – DAILY ....................................... 22

II. MAINTENANCE – MONTHLY ................................ 23

III. MAINTENANCE – EVERY 3 MONTHS .................. 24

IV. MAINTENANCE – EVERY 6 MONTHS .................. 25

V. KEY SPARE PARTS KIT ........................................ 26

SECTION 5 – TROUBLESHOOTING ............................... 27

SECTION 6 – ELECTRICAL WIRING DIAGRAM ............ 28

WIRING DIAGRAM, 740 Electric Oven, E208/240V,

50/60 Hz, 3 Ph .............................................................. 28

WIRING DIAGRAM, 740 Electric Oven, E380-480V,

50/60 Hz, 3 Ph .............................................................. 29

NOTE

Wiring Diagrams are in Section 6 of this Manual.

The diagram for each oven is also on the lower

inner surface of its Control Console.

IVP/N60254September28,2012

SECTION 1 – DESCRIPTION

I. OVEN USES

PS740 Series Ovens can be used to bake and/or cook a wide
variety of food products, such as pizza, pizza –type products,

cookies, sandwiches and others.

II. OVEN COMPONENTS – see Figure 1-1.

A. Conveyor Drive Motor: Moves the conveyor.

B. Crumb Pans: Catch crumbs and other materials that drop

through the conveyor belt. One crumb pan is located at
each end of the conveyor.

C. Conveyor: Moves the food product through the oven.

D. End Plugs: Allow access to the oven’s interior.

E. Eyebrows: Can be adjusted to various heights to prevent

heat loss into the environment.

F. Window: Allows the user to access food products inside

the baking chamber.

G. Machinery Compartment Access Panel: Allows access

to the oven’s interior and control components. No user ser­viceable parts are located in the machinery compartment.

H. Serial Plate: Provides specications for the oven that affect

installation and operation. Refer to Section 2, Installation
for details.

I. Control Panel: Location of the operating controls for the

oven. Refer to Section 3, Operation, for details.

J. Photo Cell: Turns oven On when beam is interrupted.

Not Shown:

K. Blowers: Project hot air from the heating element to the

air ngers.

L. Air Fingers: Project streams of hot air onto the food product.

Figure 1-1. Oven Components

1 P/N60254September28,2012

I. OVEN SPECIFICATIONS

Table 1-1 Dimensions Single Oven Double Oven Triple Oven

Overall Height 48-3/16″ (1219mm) 62-3/4″ (1575mm) 78-11/16″ (1981mm)

Overall Depth 60″ (1524mm) 60″ (1524mm) 60″ (1524mm)

Overall Length 76-1/2″ (1930mm) 76-1/2″ (1930mm) 76-1/2″ (1930mm)

32″ Conveyor Model 33-1/2″ (838mm) 33-1/2″ (838mm) 33-1/2″ (838mm)
or 2 × 15″ (381mm) or 2 × 15″ (381mm) or 2 × 15″ (381mm)

24″ Conveyor Model Single Oven Double Oven Triple Ove

Overall Depth 52.75″ (1340mm) 52.75″ (1340mm) 52.75″ (1340mm)
Overall Length 69″ (1753mm) 69″ (1753mm) 69″ (1753mm)

* All other dimension are the same

Recommended Minimum Clearances

Rear of Oven to Wall 3″ (76mm) 3″ (76mm) 3″ (76mm)

Control end of conveyor to Wall 1″ (25.4mm) 1″ (25.4mm) 1″ (25.4mm)

Non-control end of conveyor to Wall) 1″ (25.4mm) 1″ (25.4mm) 1″ (25.4mm)

Table 1-2: General Specications PS740 ELECTRIC

Weight 1150 lbs. (522kg)

Rated Heat Input 27.0 kW/hr (92,128 BTU, 23,216 kcal)

Maximum Operation Temperature 600°F / 315°C

Air Blowers Two Blowers at 1900 RPM

Warmup Time 15 min.

SERIES PS740 ELECTRICAL SPECIFICATIONS

Main Blower & Control Circuit Phase Frequency Amperage Poles Wires

Elements Voltage Voltage Draw

208-240V 3 Ph 50/60 Hz 100 Amp 3 Pole 4 Wire

(3 hot, 1 grd)

HEATER AMPERAGE

208-240V

208-240V 3 Ph 50/60 Hz 75 Amp 4 Pole

380V

208-240V 3 Ph 50/60 Hz 60 Amp 4 Pole

480V

Voltage kW Average Amps

L1 L2 L3

208 27 85 75 75
240 27 75 75 65

HEATER AMPERAGE

Voltage kW Average Amps N

L1 L2 L3

380-480 27 51 41 41 10

HEATER AMPERAGE

Voltage kW Average Amps N

L1 L2 L3
480 27 43 33 33 10

5 Wire

(3 hot, 1neut, 1 grd)

5 Wire

(3 hot, 1neut, 1 grd)

IMPORTANT – Additional electrical information is provided on the oven’s serial plate, and on the wiring diagram
inside the machinery compartment.

NOTE

Wiring Diagrams are contained in Section 6 of this Manual

and are also located inside the oven at the

bottom of the Control Panel

This Manual Must Be Kept For Future Reference

2P/N60254September28,2012

SECTION 2 – INSTALLATION

WARNING – After any conversions, readjustments, or service work on the oven:

• Check that the ventilation system is in operation.

WARNING - Keep the appliance area free and clear of combustibles.

WARNING – The oven must be installed on an even (level) non-ammable ooring and any adjacent walls
must be non-ammable. Recommended minimum clearances are specied in the Description section

of this manual.

WARNING – Do not obstruct the ow of ventilation air to and from your oven. There must be no obstruc­tions around or underneath the oven. Constructional changes to the area where the oven is installed
shall not affect the air supply to the oven.

CAUTION: To reduce the risk of re, the appliance is to be mounted on oors of noncombustible construction

with noncombustible ooring and surface nish and with no combustible material against the underside thereof,
or on noncombustible slabs or arches having no combustible material against the underside thereof, such con­struction shall in all cases extend not less than 12 inches (304mm) beyond the equipment on all sides.

CAUTION: For additional installation information, contact your local Authorized Service Agent.

NOTE – There must be adequate clearance between the oven and combustible construction. Clearance must

also be provided for servicing and for proper operation.

NOTE – An electrical wiring diagram for the oven is located inside the machinery compartment.

NOTE: All aspects of the oven installation, including placement, utility connections, and ventilation requirements,

must conform with any applicable local, national, or international codes. These codes supersede the require-

ments and guidelines provided in this manual.

NOTE: In the USA, the oven installation must conform to local codes. Electric ovens, when installed, must be
electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electri­cal Code (NEC), or ANSI/NFPA70.

NOTE: In Canada, the oven installation must conform with local codes. Electric ovens, when installed, must be
electrically grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electri-

cal Code CSA C22.2.

3 P/N60254September28,2012

PS740 24″ OVEN INSTALLATION

1

2

3

5

4

REQUIRED KITS AND EQUIPMENT

PS740 PS740 PS740 PS740
Electric Oven Single Oven DoubleOven TripleOven
Installation Option Base w/ OptionBase w/ OptionBase w/
TYPE OF INSTALLATION Kit 15″ Legs, 6″ Legs, Casters& Top
Casters & Top Casters & Top Kit
Kit Kit
P/N61453 P/N61123 P/N61457 P/N61458

PS740 Single Gas Oven 1 1

PS740 Double Gas Oven 2 1

PS740 Triple Gas Oven 3 1

PARTS LIST FOR SERIES PS740 ELECTRIC OVEN

INSTALLATION KIT

P/N 61453
(Two required for double oven)
(Three required for triple oven)

ITEM
NO. QTY PART NO. DESCRIPTION

1 1 61823 CONVEYOR END STOP

2 1 31461 CONVEYOR LEFT REAR STOP

3 1 42612 SERVICE AGENCY DIRECTORY

4 1 22500-0080 LABEL, MM

5 1 51054 ASSY, HANDLE & DOOR

Figure 2-1A. PS740-Series Electric Oven Installation Parts

4P/N60254September28,2012

PS740 OVEN INSTALLATION

1

2

3

5

4

REQUIRED KITS AND EQUIPMENT

PS740 PS740 PS740 PS740
Electric Oven Single Oven DoubleOven TripleOven
Installation Option Base w/ OptionBase w/ OptionBase w/
TYPE OF INSTALLATION Kit 15″ Legs, 6″ Legs, Casters& Top
Casters & Top Casters & Top Kit
Kit Kit
P/N61824 P/N67025 P/N67026 P/N66164

PS740 Single Electric Oven 1 1

PS740 Double Electric Oven 2 1

PS740 Triple Electric Oven 3 1

PARTS LIST FOR SERIES PS740 ELECTRIC OVEN

INSTALLATION KIT

P/N 61824
(Two required for double oven)
(Three required for triple oven)

ITEM
NO. QTY PART NO. DESCRIPTION

1 1 61823 CONVEYOR END STOP

2 1 55027 CONVEYOR LEFT REAR STOP

3 1 42612 SERVICE AGENCY DIRECTORY

4 1 22500-0080 LABEL, MM

5 1 51054 ASSY, HANDLE & DOOR

Figure 2-1B. PS740-Series Electric Oven Installation Parts

5 P/N60254September28,2012

2

Figure 2-2A. Model PS740 24″ Single Oven

HARDWARE BAG
5, 6, 7, 10 & 11

Option Base with Legs and Top

1

8

4

9

PARTS LIST FOR PS740 SERIES 24″ SINGLE OVEN OPTION - BASE w/15″ LEGS & TOP

P/N 67027

ITEM NO. QTY PART NO. DESCRIPTION

1 1 64943 COMPLETE BASE WELDMENT

2 4 66851 TOP PLATE, LEG WELDMENT

4 4 58930 SWIVEL CASTER FLAT PLATE

5 32 2000531 3/8″-16 × 1″ HEX SCREW, SST

6 32 21416-0001 3/8″ FLAT WASHER, SS

7 32 21422-0001 3/8″ SPLIT LOCK WASHER, ZP

8 1 22450-0228 RESTRAINT CABLE ASSEMBLY

9 1 61125 TOP COVER

10 2 59677 SCR, MS SL TR HD 10-32 × 2-1/2″

11 2 7A2S15 SCR, MS STR TRSHD 10-32 × 3/4″

6P/N60254September28,2012

2

Figure 2-2B. Model PS740 32″ Single Oven

HARDWARE BAG
5, 6, 7, 10 & 11

Option Base with Legs and Top

1

8

4

9

PARTS LIST FOR PS740 32″ SERIES SINGLE OVEN OPTION - BASE w/15″ LEGS & TOP

P/N 67025

ITEM NO. QTY PART NO. DESCRIPTION

1 1 66159 COMPLETE BASE WELDMENT

2 4 66851 TOP PLATE, LEG WELDMENT

4 4 58930 SWIVEL CASTER FLAT PLATE

5 32 2000531 3/8″-16 × 1″ HEX SCREW, SST

6 32 21416-0001 3/8″ FLAT WASHER, SS

7 32 21422-0001 3/8″ SPLIT LOCK WASHER, ZP

8 1 22450-0228 RESTRAINT CABLE ASSEMBLY

9 1 59560 TOP COVER

10 2 59677 SCR, MS SL TR HD 10-32 × 2-1/2″

11 2 7A2S15 SCR, MS STR TRSHD 10-32 × 3/4″

7 P/N60254September28,2012

HARDWARE BAG
5, 6, 7, 10 & 11

2

Figure 2-3A. Model PS740 24″ Double Oven

Option Base with Legs and Top

1

8

4

9

PARTS LIST FOR PS740 SERIES 24″ DOUBLE OVEN OPTION - BASE w/6″ LEGS & TOP

P/N 67028

ITEM NO. QTY PART NO. DESCRIPTION

1 1 64943 COMPLETE BASE WELDMENT

2 4 66853 TOP PLATE, LEG WELDMENT

4 4 58930 SWIVEL CASTER FLAT PLATE

5 32 2000531 3/8″-16 × 1 HEX SCREW, SST

6 32 21416-0001 3/8″ FLAT WASHER, SS

7 32 21422-0001 3/8″ SPLIT LOCK WASHER, ZP

8 1 22450-0228 RESTRAINT CABLE ASSEMBLY

9 1 61125 TOP COVER

10 2 59677 SCR, MS SL TR HD 10-32 × 2-1/2″

11 2 7A2S15 SCR, MS STR TRSHD 10-32 × 3/4″

8P/N60254September28,2012

2

Figure 2-3B. Model PS740 32" Double Oven

HARDWARE BAG
5, 6, 7, 10 & 11

Option Base with Legs and Top

1

8

4

9

PARTS LIST FOR PS740 SERIES 32″ DOUBLE OVEN OPTION - BASE w/6″ LEGS & TOP

P/N 67026

ITEM NO. QTY PART NO. DESCRIPTION

1 1 66159 COMPLETE BASE WELDMENT

2 4 66853 TOP PLATE, LEG WELDMENT

4 4 58930 SWIVEL CASTER FLAT PLATE

5 32 2000531 3/8″-16 × 1 HEX SCREW, SST

6 32 21416-0001 3/8″ FLAT WASHER, SS

7 32 21422-0001 3/8″ SPLIT LOCK WASHER, ZP

8 1 22450-0228 RESTRAINT CABLE ASSEMBLY

9 1 59560 TOP COVER

10 2 59677 SCR, MS SL TR HD 10-32 × 2-1/2″

11 2 7A2S15 SCR, MS STR TRSHD 10-32 × 3/4″

9 P/N60254September28,2012

Figure 2-4A. Model PS740 24″ Triple Oven

Option Base with Outriggers and Top

1

HARDWARE BAG
7, 8, 9, 10, 11, 12,
13, 14, & 17

5

6

2

15

3

4

16

PARTS LIST FOR PS740 SERIES 24″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP

P/N 64946

ITEM NO. QTY PART NO. DESCRIPTION
1 1 64943 COMPLETE BASE WELDMENT

2 4 45209 QUAD OUTRIGGER WELDMENT

3 2 22290-0010 SWIVEL CASTER, FLAT PLATE

4 2 22290-0009 SWIVEL CASTER, FLAT PLATE, W/BRAKE

5 4 45206 INSERT,QUAD ADJUSTMENT FOOT

6 4 45205 SPACER,QUAD CASTER

7 32 A27727 3/83 -16x1-1/4 HEX BOLT

8 32 A21924 3/83 FLAT WASHER, SS

9 32 21422-0001 3/83 SPLIT LOCK WASHER, ZP

10 16 21172-0004 3/83 -16 NYLON INSULATED LOCKNUT, ZC

11 8 2001048 1/23 -13 x 1-3/8 18-8 HEX CAPSCREW

12 8 A27750 1/23 18-8 FLAT WASHER

13 8 21422-0016 1/23 18-8 LOCK WASHER

14 2 59677 SCR, MS SL TR HD 10-32X2-1/2

15 1 22450-0228 RESTRAINT CABLE ASSEMBLY

16 1 61125 TOP COVER

17 2 7A2S15 SCR, MS STR TRSHD 10-32X3/4″

10P/N60254September28,2012

Figure 2-4B. Model PS740 32″ Triple Oven

Option Base with Outriggers and Top

1

HARDWARE BAG
7, 8, 9, 10, 11, 12,
13, 14, & 17

5

6

2

15

3

4

16

PARTS LIST FOR PS740 SERIES 32″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP

P/N 66164

ITEM NO. QTY PART NO. DESCRIPTION
1 1 66159 COMPLETE BASE WELDMENT

2 4 45209 QUAD OUTRIGGER WELDMENT

3 2 22290-0010 SWIVEL CASTER, FLAT PLATE

4 2 22290-0009 SWIVEL CASTER, FLAT PLATE, W/BRAKE

5 4 45206 INSERT,QUAD ADJUSTMENT FOOT

6 4 45205 SPACER,QUAD CASTER

7 32 A27727 3/83 -16x1-1/4 HEX BOLT

8 32 A21924 3/83 FLAT WASHER, SS

9 32 21422-0001 3/83 SPLIT LOCK WASHER, ZP

10 16 21172-0004 3/83 -16 NYLON INSULATED LOCKNUT, ZC

11 8 2001048 1/23 -13 x 1-3/8 18-8 HEX CAPSCREW

12 8 A27750 1/23 18-8 FLAT WASHER

13 8 21422-0016 1/23 18-8 LOCK WASHER

14 2 59677 SCR, MS SL TR HD 10-32X2-1/2

15 1 22450-0228 RESTRAINT CABLE ASSEMBLY

16 1 59560 TOP COVER

17 2 7A2S15 SCR, MS STR TRSHD 10-32X3/4″

11 P/N60254September28,2012

III. VENTILATION SYSTEM

IMPORTANT

Where national or local codes re-

quire the installation of re sup-

pression equipment or other

supplementary equipment, DO NOT

mount the

equipment directly to the oven.

MOUNTING SUCH EQUIPMENT ON

THE OVEN MAY:

• VOID AGENCY CERTIFICATIONS

• RESTRICT SERVICE ACCESS

• LEAD TO INCREASED SERVICE

EXPENSES FOR THE OWNER

A. Requirements

A mechanically driven ventilation system is STRONGLY
RECOMMENDED for electric oven installations.

PROPER VENTILATION OF THE OVEN IS THE RESPON­SIBILITY OF THE OWNER.

B. Recommendations

NOTE THAT THE HOOD DIMENSIONS SHOWN IN
FIGURE 2-5 ARE RECOMMENDATIONS ONLY.
LOCAL, NATIONAL AND INTERNATIONAL CODES
MUST BE FOLLOWED WHEN INSTALLING THE
VENTILATION SYSTEM. ANY APPLICABLE CODES
SUPERSEDE THE RECOMMENDATIONS SHOWN IN THIS
MANUAL.

The rate of air ow exhausted through the ventilation system
may vary depending on the oven conguration and hood de-

sign. Consult the hood manufacturer or ventilation engineer

for these specications.

To avoid a negative pressure condition in the kitchen area,

return air must be brought back to replenish the air that was

exhausted. A negative pressure in the kitchen can cause
heat- related problems to the oven components as if there
were no ventilation at all. The best method of supplying return

air is through the heating, ventilation and air conditioning

(HVAC) system. Through the HVAC system, the air can be
temperature-controlled for summer and winter. Return air can
also be brought in directly from outside the building, but detri­mental effects can result from extreme seasonal hot and cold

temperatures from the outdoors.

NOTE: Return air from the mechanically driven system must

not blow at the opening of the baking chamber. Poor
oven baking performance will result.

C. Other ventilation concerns

• Special locations, conditions, or problems may require the

services of a ventilation engineer or specialist.

• Inadequate ventilation can inhibit oven performance.

• It is recommended that the ventilation system and duct
work be checked at prevailing intervals as specied by the
hood manufacturer and/or HVAC engineer or specialist.

18″ (458mm)

minimum

(Typical - both

ends of oven)

Figure 2-5. Ventilation System

2″ (51mm)

minimum

8″ (203mm)

minimum

3″ (76mm)

minimum

12P/N60254September28,2012

IV. ASSEMBLY

Bottom oven�

A. Top Panel and Base Pad Assembly

1. Install the four leg extensions onto the base pad using
the 3/8″ -16 × 1″ screws, 3/8″ flat washers, and
3/8″ lockwashers supplied in the Base Pad Kit. See
Figure 2-6. Check that the nished sides of each leg exten­sion face OUTWARDS. One rear leg should be attached
using three 3/8″-16 × 1″ screws and the 3/4″ eyebolt, as
shown in Figure 2-6. This eyebolt acts as the anchor point
for the restraint cable assembly (see Part C, Restraint
Cable Installation).

2. If your oven is equipped with the lower shelf, position it

in place as shown in Figure 2-6. Check that the lip on the
shelf faces DOWN. Seal joint between leg and shelf with
NSF listed silicone.

3. Install one caster onto each leg extension, as shown in
Figure 2-7. Use the 3/8″-16 × 1″ screws, 3/8″ at wash­ers, and 3/8″ lockwashers supplied in the Installation Kit.
The locking casters should be installed at the FRONT of
the oven. The non-locking casters should be installed at
the REAR of the oven.

4. Install the lower oven cavity onto the base pad.
See Fig 2-7.

5. For single ovens ONLY:

Install the top panel using the screws included in the base

pad kit, as shown in Figure 2-8. Then, skip ahead to Part

C, Restraint Cable Installation.

For double or triple ovens:

Continue on to Part B, Stacking. Note that the top panel

should NOT be installed for double and triple ovens until

after stacking the oven cavities.

Figure 2-6. Leg extension and casters installation

1/2″ at

washer

1/2″ lock

washer

1/2″-13 × 1-1/4″

hex screw

Figure 2-7. Base pad Installation

cavity

Assembled�

base pad

Figure 2-8. Top panel installation

#10-32 × 2-1/2″

screw length

#10-32 × 3/4″

screw length

Top

panel

13 P/N60254September28,2012

NOTE: DO NOT install top panel onto double or triple

ovens until AFTER stacking the oven cavities. See
Part B, Stacking.

B. Stacking

For single ovens, skip ahead to Part C, Restraint Cable
Installation.

IMPORTANT

Middleby Marshall STRONGLY RECOMMENDS that PS740
Electric oven cavities be stacked BY AUTHORIZED PERSO­NEL.

C. Restraint Cable Installation

Because the oven is equipped with casters, a restraint cable

assembly must be installed to limit the movement of the appli­ance. One end of the cable is anchored to the eyebolt on the
rear surface of the oven’s base pad, while the other is anchored

to the wall. See Figure 2-11.

After connecting the restraint cable, move the oven to its nal
location. Adjust the bottom (hex) sections of the feet so that
the casters are off the oor. For quad ovens, lock the two

front casters.

Contact your Middleby Marshall Authorized Service Agent for
complete stacking instructions.

1. Stack an oven cavity on top of the lower oven. Check

the following:

• All four sides of the lower lip (on the bottom edge of
the oven cavity) overlap the top of the lower oven

• The oven is level

• The oven is rmly seated

See Figure 2-9.

2. For triple ovens, repeat Step 1 to install the top

oven cavity.

3. Install the top panel using the screws included in the base
pad kit, as shown in Figure 2-10.

Figure 2-9. Stacking

Figure 2-10. Top panel installation

#10-32 × 2-1/2″

screw length

#10-32 × 3/4″

screw length

Top

panel

3/8″-18 × 1″

14P/N60254September28,2012

Figure 2-11. Installing the Restraint Cable

Restraint cable assembly

eyebolt on

rear leg

extension

3/4″ (19mm)

eyebolt

Wall of structure

D. Conveyor Installation

1. Unfold the conveyor as shown in Figure 2-12. Then,
begin to slide the conveyor into the end of the oven. The

conveyor can only be installed from the end of the oven
with the drive motor.

2. Continue moving the conveyor into the oven until the frame
protrudes equally from each end of the oven. Check that
the crumb tray supports located on the underside of the

conveyor frame rest rmly against the lower end plugs,
as shown in Figure 2-13.

3. When the conveyor is positioned properly, check for

freedom of movement of the conveyor belt by pulling it

for about 2-3 feet (0.6-1.0m) with your ngers. The drive

and idler shafts must rotate smoothly, and the belt must
move freely without rubbing on the inside of the oven.

4. Check the tension of the conveyor belt as shown in
Figure 2-14. The belt should lift about 1″ (25mm).

DO NOT OVERTIGHTEN THE CONVEYOR BELT.

Figure 2-13. Conveyor placement

Crumb tray

support
bracket

End plug

NOTE: If necessary, the belt tension can be adjusted by

turning the conveyor adjustment screws, located

at the idler (non-control) end of the conveyor. See
Figure 2-14.

Figure 2-12. Conveyor installation

Folded

frame

Idler end (with belt tension

adjustment screws)

Conveyor

placed in

oven

Figure 2-14. Conveyor Belt tension

Drive end (with

drive sprocket)

1″ (25mm) verti-

cal deection

Adjustment

screws (2) on

idler end of

conveyor

15 P/N60254September28,2012

5. If it is necessary to add or remove conveyor links to achieve

the correct tension, OR if it is necessary to reverse the
conveyor belt for correct orientation, the belt will need to
be removed from the conveyor frame. If this is necessary,

perform the following procedure:

• Remove the conveyor assembly from the oven and place
it at on the oor.

• Remove the master links using long-nose pliers. Then,

roll up the belt along the length of the conveyor frame.

• Add or remove belt links as necessary to achieve the

correct belt tension.

• Replace the belt on the conveyor frame. Check that the
conveyor belt links are oriented as shown in Figure 2-15,
and that the smooth side of the conveyor belt faces UP.

• Connect the inside master links. Check that the links
are oriented as shown in Figure 2-15.

• Connect the outside master links. Note that the outside
master links each have an open hook on one side. This

hook aligns with the hooks along the sides of the other

conveyor links. See Figure 2-15.

• Replace the conveyor into the oven.

Figure 2-15. Conveyor and Master Link orientation

Direction

of travel

Incorrect

master link

position

E. Final Assembly

1. Install the crumb trays underneath the conveyor as shown

in Figure 2-16.

CORRECT

master link

position

Figure 2-16. Crumb Trays

CONVEYOR BELT REVERSAL

Conveyor belt reversal consists of three steps:

1. Physically reversing the conveyor belt.

2. Resetting direction jumper on the conveyor control board.

3. Switching the photo detector.

REVERSING THE CONVEYOR BELT

Remove the conveyor from the oven and nd the master link

location. Remove master links and remove the belt from the

conveyor frame. Reassemble the belt back onto the frame (in
the reverse direction) and reinstall the master links. Replace

the conveyor assembly in the oven.

RESETTING DIRECTION JUMPER

Locate Jumper P1 on the conveyor control board. Move jumper
from terminals 1 and 2, and replace onto terminals 2 and 3.

CAUTION: Shock hazard in compartments electrical lters

are electrically alive.

SWITCHING PHOTO DETECTOR

CAUTION: Disconnect Power Before Switching Photo eye.

Remove the three screws securing the access door to the unit.

Open the access door and disconnect the connector tting to

the photo eye assembly. Remove the two screws securing the

photo eye assembly to the control box. Remove the four nuts

securing the photo eye to the housing. Rotate the photo eye

180 degrees and resecure the photo eye with the four nuts.

On the opposite control box, remove the two screws holding the

cover where the photo eye assembly will be positioned. Secure
the photo eye assembly in position with the two screws. Place

the photo eye cover on the opposite control box, where the

photo eye assembly was removed, and secure the two screws.
Secure the access door with the three screws.

Remove the three screws securing the access door on the
opposite side. Open the access door, where the photo eye is

now positioned, and connect the photo eye connector tting.

Secure the access door with the three screws.

Apply power to the unit. Adjust the photo eye height by loosening
the two screws securing the photo eye assembly and sliding
the photo eye assembly either up or down, such that the beam

is approximately 1/4 inch above the belt.

Crumb tray

insertion

Note: This is MUCH easier in reduced light.

Replace all covers.

16P/N60254September28,2012

III. ELECTRICAL CONNECTION INFORMATION

FOR PS740E-SERIES OVENS.

WARNING

Authorized supplier personnel normally
accomplish the connections for the ventilation
system, electric supply, as arranged by the

customer. Following these connections, the
factory-authorized installer can perform the

initial startup of the oven.

Check the oven data plate (Figure 2-17) before making any
electric supply connections. Electric supply connections must

agree with data on the oven data plate.

NOTE: The electric supply installation must satisfy the require-

ments of the appropriate statutory authority, such as the National

Electrical Code (NEC), ANSI/NFPA70, (U.S.A.); the Canadian
Electrical Code, CSA C22.2; the Australian Code AG601; or

other applicable regulations.

A fused disconnect switch or a main circuit breaker (customer
furnished) MUST be installed in the electric supply line for
each oven; it is recommended that this switch/ circuit breaker
have lockout/tagout capability. The electric supply connection

must meet all national and local electrical code requirements.
Copper is the recommended material for the electrical supply
conductors.

IV. ELECTRIC SUPPLY FOR ELECTRICALLY

HEATED OVENS

Power requirements for electrically heated ovens are usually

208 - 240VAC, 3-phase, 4-wire (3 ‘hot’, 1 ground), although
ovens built for export can have power requirements of 380VAC
and 480VAC. (These ovens have a 5-wire system.) A 2″ (51mm)

diameter cutout/hole in the back of the machinery compartment

provides access for the electrical supply connections. Using
exible cable(s) for the electrical power supply conductors

requires a 2″ (51mm) strain-relief tting (not furnished) to en-
able safe access to the terminal block from which oven power
is distributed.

The supply conductors must be of the size and material (cop­per) recommended to provide the current required; (refer to the
data plate for the ampere specications). The electric current
rating for each conductor supplying a PS740E-Series Oven

must comply to local and national codes.

Typical specifications for each PS740E-Series Oven
are 208V or 240V, 3-phase, 4-wire, 60-ampere, 34.4kW. A
PS740E-Series Double Oven (Figure 1-2) installation would
require two 60-ampere service connections, one for each
oven; the 34.4kW power consumption also doubles for such
an installation to 68.8kW.

The 208V or 240VAC electrically heated oven uses two legs
of the supplied power to provide 208V or 240VAC power for

the oven control circuitry.

Electrical Junction Box

(One per oven cavity)

Figure 2-17. Typical Electric Oven Data Plate

Figure 2-18. Utility Connection Locations for Elec-

tric Ovens

17 P/N60254September28,2012

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

To Oven

To Oven

FOR PS740-SERIES OVENS

WARNING

DO NOT USE CONDUIT FOR GROUND
CONNECTION.

CAUTION

IT IS RECOMMENDED THAT THE OVEN
BE PLACED UNDER A VENTILATION
HOOD FOR ADEQUATE AIR SUPPLY
AND VENTILATION.

ELECTRIC SUPPLY TO BE

PROVIDED BY CUSTOMER

CIRCUIT BREAKER

Separate circuit breaker with lockout/tagout electrical shutoff

for each oven. Wire each oven separately.

100 Amp circuit breaker for 208-240V, or 50 Amp circuit
breaker for 380-480V.

ELECTRICAL SPECIFICATIONS

DOMESTIC: 208V main blower motors and elements,

3 Ph, 75 Amp draw, 50/60 Hz, 208-240V control circuit,
3 pole, 4 wire system per oven (3 hot, 1 grd).

Do NOT use conduit for ground.

or

DOMESTIC: 240V main blower motors and elements,

3 Ph, 65 Amp draw, 50/60 Hz, 208-240V control circuit,
3 pole, 4 wire system per oven (3 hot, 1 grd).

Do NOT use conduit for ground.

or

EXPORT: 380V elements, 3 Ph, 41 Amp draw, 50/60 Hz,

208-240V control circuit and main blower motor, 4 pole,
5 wire system per oven (3 hot, 1 neutral, 1 grd).

Do NOT use conduit for ground.

or

DOMESTIC: 480V elements, 3 Ph, 32.5 Amp draw,

50/60 Hz, 208-240V control circuit and main blower motor,
4 pole, 5 wire system per oven (3 hot, 1 neutral, 1 grd).

Do NOT use conduit for ground.

Suggested dimensions are shown; utility code
requirements supersede any factors shown.

Figure 2-19. Typical PS740-Series Oven(s)

Installation

ELECTRICAL RATING

27.0 kW/hr.

SUPPLY WIRE

Supply wire size must be in accordance with the National

Electrical Code (current edition) and must be in compliance

with local codes.

NOTE: The electrical terminal connection marked “MP” located

inside the control compartment is desiganated for the blue

(neutral) wire to the oven. See the electrical wiring/schematics
in Section 6 of this manual.

SUGGESTED

If space permits, service should be located near the control

console end of the oven(s) to allow convenient access to

safety switches.

18P/N60254September28,2012

SECTION 3 - OPERATION

E. Energy Level

Indicators

C. Temperature Control/Display

B. Conveyor Time Setting

D. Message Bar

E. Energy Level

Indicators

A. Main On/Off Button

I. LOCATION AND DESCRIPTION OF CONTROLS

A. Main On/Off Button

Turns all oven functions on or off. If the oven is below the set

point, it will rise to the set point and turn the conveyor on. If

it is turned off and the oven is above 200° F, the blowers will
remain on until the oven drops below 200° F.

B. Conveyor Time Setting

Adjusts and displays the conveyor bake time. Dual belt ovens

have two displays, single units have one.

C. Temperature Control/Display

Displays the average set point of both right and left sides of

the oven. Pressing on the display allows individual temperature
displays and adjustments.

D. Message Bar

Displays messages during oven operation.

E. Energy Level Indicators

Displays energy usage on left and right sides of the oven.

19 P/N60254September28,2012

II. NORMAL OPERATION - STEP-BY-STEP-

A. Daily Startup Procedure

1. Check that the circuit breaker/fused disconnect is in the

On position. Check that the window is closed. The touch

panel display should be lit.

2. Adjust the conveyor to the desired bake time.

3. Press the temperature button to display right and left hand

oven settings. Set temperatures as desired.

4. Press the ON button to activate the oven. The conveyor

will not run, until the oven temperature has reached the
set points.

B. Daily Shutdown Procedure

1. Make certain there are no products left on the conveyor
in the oven.

2. Press the ON square to turn the oven off.

3. Open the window to allow the oven to cool faster.

4. After the oven has cooled and the blowers have turned off,

the circuit breaker/fused disconnect may be turned off.

Quick Reference – Touch Screen Controller

A. Main Screen

1. On/Off button - Used to turn oven On and Off.

2. Conveyor speed - Pressing on either the minutes or seconds

allows a new value to be input for the conveyor speed.

Split belt ovens have two inputs (front and rear belts).

3. Oven temperature - Pressing on the set temperature shifts

the user to the oven temperature set point/indicator screen.

4. Energy level indicators - Indicators to either side of the

screen indicate the energy input to that side of the oven.

5. Message bar - Indicates various messages pertaining to

current oven conditions.

B. Oven Temperature/Set Point/Indicator Screen

1. Right actual temperature - Indicates current average tem-

perature of the right side of the oven.

2. Left actual temperature - Indicates current average tem-

perature of the left side of the oven.

NOTE: Right to Left temperature settings should not exceed

a differential of 20 °F.

3. Right Set point temperature - Pressing on this value allows

the user to adjust the set point for the right side of the oven.

4. Left Set point temperature - Pressing on this value allows

the user to adjust the set point for the left side of the oven.

5. Exit - Returns to the main screen.

C. Energy Modes

Energy Mode One - This mode is automatic, and starts (bake

time +1 minute) after the last product has entered the oven.
In this mode, the main oven blowers will lower to 1500 RPM,

while the oven maintains temperature and belt speed.

Energy Mode Two - The oven lowers its set point by 100°
F, and stops the belt. Anytime that the oven is more than 10

degrees over its set point, the ovens will completely shut off,

allowing the oven to cool. The main blowers will continue to run
at 1500 RPM in this mode. Placing any article on the input belt

will cause normal operation of the oven to resume, and bring the

set point back to its original level. The belt will resume operation
once both sides of the oven are within 5° F of the set point.

Energy Mode Three - The oven will turn off completely and

shut off the circulation blowers once the oven temperature has

dropped below 200° F. Placing any article on the input belt will

cause normal operation of the oven to resume, and bring the

set point back to its original level. The belt will resume opera­tion once both sides of the over are within 5° F of the set point.

Energy Mode Four - This is a complete oven shut down. Plac­ing anything on the belt will NOT return the oven to Operation.
The ON button on the main screen has to be pressed to restart

the oven.

20P/N60254September28,2012

III. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM PROBLEM SOLUTION

Oven will not

turn On.

Oven will not

heat.

Oven is operating, but little

or no air is coming from

the ngers.

Conveyor will not move.

Noelectricalpower • Checkthatthecircuitbreaker/fuseddisconnectison.Make

suretheemergenctstopbuttonison.

Faulty contactor

Faulty heater element

Air fingers may be as­sembled incorrectly after
cleaning.

Conveyormaybejammed. • Turnovenoff,andallowtocool.Checkconveyorforblockage.

• Replace contactor.

• Replace element.

• Turnovenoff,andallowtocool.Reassemblengerscorrectly.

SCREEN ALERTS

SYMPTOM PROBLEM SOLUTION

High Control Compartment

Temperature

MainBlowerproblem

orCombustionBlower

problem.

Clean and replace the front

fan lters.

The computer has detected

a problem with either the
main, or burner blowers.

• Failuretodothiswilleventuallyshutdowntheovendueto
excessivetemperature.

• Thisshouldbecorrectedbyaqualiedservicetechnician.

 ControlOverTemp Frontltersareclogged • Cleanorreplacelters.


 Frontbeltjammed Frontbelthasstopped • Removeobstruction,andrestartoven.  
    • Ifnoobstruction,callservice.

 RearBeltjammed Rearbelthasstopped • Removeobstruction,andrestartoven.  
    • Ifnoobstruction,callservice.

 HighTempError Thermocoupleor • Callservice
  PLCmalfunction

 Beltoff-Ovennot Normaloperationuntil
 intemperature Ovenreachesoperating
  temperature

 EnergySavingMode1 Normaloperation

 Energysavingmode2 Normaloperation


 EnergysavingMode3 Normaloperation

21 P/N60254September28,2012

SECTION 4 - MAINTENANCE

WARNING

Before ANY cleaning or servicing of the oven, perform the following procedure:

1. Switch off the oven and allow it to cool. Do NOT service the oven while it is warm.

2. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven.

When all cleaning and servicing is complete:

1. If the oven was moved for servicing, return the oven to its original location.

2. If the restraint cable was disconnected to clean or service the oven, reconnect it at this time.

3. Reconnect the electrical supply.

4. Turn on the electric supply circuit breaker(s).

5. Perform the normal startup procedure.

WARNING

Possibility of injury from moving parts and electrical shock exists in this oven. Switch off and lockout/tagout the

electric supply BEFORE beginning to disassemble, clean, or service any oven. Never disassemble or clean an

oven with the BLOWER ( ) switch or any other circuit of the oven switched on.

CAUTION

NEVER use a water hose or pressurized steam-cleaning equipment when cleaning this oven. To avoid saturating the oven
insulation, DO NOT use excessive amounts of water. DO NOT use a caustic oven cleaner, which can damage the bake
chamber surfaces.

NOTE

ANY replacement parts that require access to the interior of the oven may ONLY be replaced by a Middleby Marshall Autho­rized Service Agent. It is also strongly recommended that the 3-Month Maintenance and 6-Month Maintenance procedures
in this section be performed ONLY by a Middleby Marshall Authorized Service Agent.

I. MAINTENANCE - DAILY

A. Check that the oven is cool and the power is disconnected,

as described in the warning at the beginning of this Section.

B. Clean ALL of the cooling fan grills and vent openings with

a stiff nylon brush. Refer to Figure 4-1 for the locations of

the grills and vents.

C. Clean the outside of the oven with a soft cloth and mild

detergent.

D. Check that ALL cooling fans are operating properly.

CAUTION: If a cooling fan is not operating correctly, it must

be replaced IMMEDIATELY. Operating the oven
without adequate cooling can seriously damage
the oven's internal components.

E. Clean the conveyor belts with a stiff nylon brush. This

is more easily accomplished by allowing the conveyor to

run while you stand at the exit end of the conveyor. Then,

brush the crumbs off the conveyor as it moves.

F. Remove and clean the crumb trays. If necessary, refer to

Figure 2-16 (in Section 2, Installation) when replacing the

crumb trays into the oven.

G. Clean the window in place.

Figure 4-1. Cooling Vents and Grills

Vents on

front panel

of oven

Fan grills (3) on rear

of oven and control

compartment

Vent (2) on rear

of machinery
compartment

22P/N60254September28,2012

II. MAINTENANCE – MONTHLY

NOTE: When removing the conveyor, refer to Figure 2-12 (in

Section 2, Installation).

A. Check that the oven is cool and the power is disconnected,

as described in the warning at the beginning of this Sec­tion.

B. Remove the crumb trays from the oven.

C. Lift the drive end of the conveyor slightly, and push it

forward into the oven. This removes the tension from the
drive chain. Then, remove the drive chain from the conveyor

sprocket.

D. Slide the conveyor out of the oven, folding it as it is removed.

E. Remove the end plugs from the oven. The end plugs are

shown in Figure 1-1 (in Section 1, Description).

F. Slide the air ngers and blank plates out of the oven, as

shown in Figure 4-2. AS EACH FINGER OR PLATE IS
REMOVED, WRITE A “LOCATION CODE” ON IT WITH A
MARKER to make sure that it can be reinstalled correctly.

Figure 4-2. Removing Air Fingers and Plates

Example of markings:

(Top Row) T1 T2 T3 T4 T5 T6
(Bottom Row) B1 B2 B3 B4 B5 B6

G. Disassemble the air ngers as shown in Figure 4-3. AS

EACH FINGER IS DISASSEMBLED, WRITE THE “LOCA­TION CODE” FOR THE FINGER ON ALL THREE OF ITS
PIECES. This will help you in correctly reassembling the
air ngers.

CAUTION: Incorrect reassembly of the air ngers will change

the baking properties of the oven.

H. Clean the air nger components and the interior of the baking

chamber using a vacuum cleaner and a damp cloth. Refer

to the boxed warnings at the beginning of this Section for

cleaning precautions.

I. Reassemble the air ngers. Then, replace them in the

oven, using the “location guide” as a guide.

J. Replace the end plugs on the oven.

K. Reassemble the conveyor into the oven. If the drive sprocket

was removed when installing the conveyor, replace it at
this time.

L. Reattach the drive chain.

M. Check the tension of the conveyor belt as shown in Fig-

ure 2-14 (in Section 2, Installation). The belt should lift
between 3 - 4″ (75-100mm). DO NOT OVERTIGHTEN
THE CONVEYOR BELT. If necessary, the belt tension can

be adjusted by turning the conveyor adjustment screws,

located at the idler (right) end of the conveyor.

N. Replace the crumb trays.

Figure 4-3. Disassembling the Air Fingers

23 P/N60254September28,2012

III. MAINTENANCE – EVERY 3 MONTHS

A. Check that the oven is cool and the power is disconnected,

as described in the warning at the beginning of this Section.

B. Vacuum both of the blower mounts, and their surrounding

compartments, using a shop vacuum.

C. Tighten all electrical terminal screws.

D. Split Belt Disassembly and Cleaning

1. Refer to Part D, Conveyor Installation, in the Installa­tion section of this Manual. Then, remove the following
components from the oven:

• Conveyor end stop

• Crumb trays

• Chain cover

• Drive chains

• End plugs

• Conveyor assembly

2. Remove the master links from each conveyor belt.

Then, roll the belts up along the length of the conveyor

to remove them from the frame.

3. Remove the two conveyor adjustment screws from the
idler end of the conveyor frame, as shown in Figure
4-4.

4. Remove the idler shaft assembly from the conveyor.

5. Pull apart the two sections of the idler shaft.

6. Clean the shafts thoroughly using a rag. Then, lubri­cate both the extended shaft and the interior of the
hollow shaft using a light food-grade lubricant. DO NOT
lubricate the shafts using WD40 or a similar product.
This can cause the shafts to wear rapidly.

7. Before reassembling the shafts into the conveyor

frame, check that they are oriented properly.

8. Reassemble the idler shaft into the conveyor. Make

sure that the bronze washer is in place between the

Figure 4-4. Disassembling the idler shaft

two sections of the shaft. See Figure 4-4.

9. Replace the conveyor adjustment screws as shown in
Figure 4-4. To allow the conveyor belt to be reinstalled

later, do not tighten the screws at this time.

10. Loosen the set screw on both of the conveyor drive
sprockets. Then, remove the sprockets from the shaft.

11. Check the conveyor conguration as follows:

High-speed conveyors are equipped with large ange

bearings at both ends of the shaft, as shown in

Figure 4-5. For these conveyors, remove the two

screws that hold each bearing to the conveyor frame.

With the screws removed, lift the end of the shaft at

the front of the oven, and pull the entire assembly free
of the conveyor frame.

Standard conveyors are equipped with bronze bush-

ings mounted on spacers at both ends of the shaft,

as shown in Figure 4-5. For these convey ors, remove

the two screws that hold the bracket to the conveyor

frame. With the screws removed, lift the end of the
shaft at the front of the oven, and pull the entire as­sembly free of the conveyor frame. The brackets will

be removed along with the drive shaft assembly.

12. Disassemble and lubricate the two sections of the

drive shaft as described for the idler shaft, above.

13. Before reassembling the shafts into the conveyor

frame, check that they are oriented properly.

14. Reassemble the drive shaft into the conveyor. Make
sure that the bronze washer is in place between the
two sections of the shaft. See Figure 4-4.

15. Replace the drive sprockets. Reassemble the belts

and master links onto the conveyor.

16. Reinstall the end plugs and conveyor onto the oven.

17. Reattach the drive chains. Replace the chain cover.

18. Check the tension of the conveyor belt as shown in
Figure 2-14 (in Section 2, Installation). The belt should

lift about 1″ (25mm). If necessary, adjust the belt ten-
sion by turning the conveyor adjustment screws.

19. Replace all components onto the oven.

Figure 4-5. Drive shaft congurations

24P/N60254September28,2012

Figure 4-6. Disassembling the drive shaft

Figure 4-7. Rear panel access

Remove eight (8)

screws to remove

rear panel

Bearings

(2total)

Blower belt

E. Blower Belt

1. Remove the eight screws shown in Figure 4-7. Then,

remove the rear panel from the oven.

2. Check the blower belt for the proper 1/4″ (6mm) deection
at the center, and for cracking or excessive wear.

See Figure 4-7. Overtightening the belt will cause premature

bearing failure and possible vibrations. A loose belt may also
cause vibrations.

3. If necessary, adjust the tension of the belt by loosening

the four motor mounting bolts. Reposition the motor as

neccessary until the correct 1/4″ (6mm) deection is

reached, then tighten the bolts.

Blower motor

Loosen four (4) screws to adjust mo-

tor position and belt tension

IV. MAINTENANCE - EVERY 6 MONTHS

A. Check that the oven is cool and the power is disconnected,

as described in the warning at the beginning of this Section.

B. Check for excessive wear on the conveyor drive motor

brushes. The brushes should be replaced if they have
worn to less than 1/4" (6mm) in length. Be sure to replace
the brushes in exactly the same position.

C. For gas ovens, inspect and clean the burner nozzle and

the spark electrode assembly.

D. Check the conveyor drive shaft bushings and spacers.

Replace the components if they are worn.

25 P/N60254September28,2012

V. KEY SPARE PARTS – Available separately. See Figure 4-8.

1

6

13, 14, 15, 16

2 3

8

7

9

17

23

24

18

10

4

19, 20, 21

25

5

11, 12

22

Figure 4-8. Key Spare Parts

ITEM QTY. P/N DESCRIPTION

 1 1 60190 DIGITAL DISPLAY, PROGRAMMED
2 1 58920 CONVEYOR DRIVE MOTOR W/PICKUP ASSY.
3 1 58679 CONVEYOR SPEED CONTROLER
4 1 60196 KIT, THERMOCOUPLE 6″
5 1 59668 BELT, BLOWER
6 1 57288 MOTOR, BLOWER, 2HP
7 1 33983 HIGH LIMIT CONTROL MODULE, 240V
8 1 51399 COOLING FAN (BACKWALL)
9 1 97525 COOLING FAN (CONTROL COMPARTMENT)
10 1 60598 AIR SWITCH
11 2 44914 CONTROLLER, POWER 208V/240V
12 2 44568 CONTROLLER, POWER 380V/480V
13 1 60750 HEATER 208V 27.0 kW
14 1 60751 HEATER 240V 27.0 kW
15 1 60752 HEATER 380V 27.0 kW
16 1 60753 HEATER 480V 27.0 kW
17 1 60253 PHOTOCELL
18 1 60638 INVERTER, PROGRAMMED
19 1 60684 PLC
20 1 58668 THERMOCOUPLE MODULE
21 1 58669 CURRENT MODULE
22 2 59132 RELAY, DPDT 24V COIL
23 1 M9608 POWER SUPPLY
24 1 60452 CONTACTOR, 24VDC

25 1 60636 BEARING, PB 5/8 B

26P/N60254September28,2012

SECTION 5

TROUBLESHOOTING

PROBLEM:

PRODUCTS ARE OVERCOOKED

OR UNDERCOOKED

Check for correct

setting of conveyor

speed control.

Set the conveyor speed

control at correct setting.

Verify the food prepa-

ration process.

If products still cook incorrectly,

call your Middleby Marshall Ser-

vice Agency.

Check for correct

setting on tempera-

ture controller.

Turn temperature

control to correct

setting.

PROBLEM:

OVEN BLOWER AND CONVEYOR OPERATE,

YET THE OVEN IS NOT HEATING

Reset the temperature controller

to a new setting (above 200°F),

after turning the BLOWER switch

to off for 30 seconds.

Start the oven again. If the oven still does not

heat, call your Middleby Marshall Service Agency.

PROBLEM:

CONVEYOR WILL NOT HOLD PROPER SPEED

OR WILL NOT RUN AT ALL

Check whether the conveyor is
jammed on something in oven.

PROBLEM:

OVEN DOES NOT HEAT

Check to see if both BLOWER
switch and HEAT switch are in

the “ON” or “I” position.

If oven does not heat, call your

Middleby Marshall Service Agency.

PROBLEM:

BLOWER MOTOR IS RUNNING, YET LITTLE

OR NO AIR BLOWS FROM AIR FINGERS

Air ngers reassembled incorrectly,

after cleaning.

Assemble air ngers correctly, after cleaning.

Refer to Section 4 procedure, or call your

Middleby Marshall Service Agency.

Check for proper tension of conveyor drive

chain and conveyor belt. Refer to Section 4 for

correct procedure.

Check that the conveyor

drive sprocket is tight.

If conveyor still does not run correctly, contact

your Middleby Marshall Service Agency.

PROBLEM:

OVEN DOES NOT TURN ON WHEN ITS

SWITCHES ARE TURNED ON

Check that all electric supply switches are set to

the “ON” or “I” position. Then, start the oven.

If oven still will not start, contact your Middleby

Marshall Service Agency.

27 P/N60254September28,2012

SECTION 6 - WIRING DIAGRAM

60739 Rev. J

Middleby-Marshall Model Number E208-240 Volt 50/60 Hz, 3 Phase

28P/N60254September28,2012

60741 Rev. L

29 P/N60254September28,2012

Middleby-Marshall Model Number E380-480 Volt 50/60 Hz, 3 Phase

NOTES

30P/N60254September28,2012

NOTES

31 P/N60254September28,2012

WARNING

Improper installation, adjustment, alteration, service or maintenance

can cause property damage, injury or death. Read the installation, op-

erating and maintenance instructions thoroughly before

installing or servicing this equipment.

NOTICE

During the warranty period, ALL parts replacement and servicing should be performed

by your Middleby Marshall Authorized Service Agent. Service that is performed by par-

ties other than your Middleby Marshall Authorized Service Agent may void your war-

ranty.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts re-

lieves the manufacturer of all warranty and liability.

NOTICE

Middleby Marshall reserves the right to change specications at any time.

Middleby is proud to support the Commercial Food Equipment
Service Association (CFESA). We recognize and applaud
CFESA's ongoing efforts to improve the quality of technical

service in the industry.

Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • USA • [phone] • FAX [phone]

www.middleby.com

P/N60254September28,2012