Middleby Marshall PS640 Owner's Operating And Installation Manual

PS640 Series
Electric
Domestic & Std. Export
ENGLISH

P/N 60614

October 2007

PS640 Series Electric Ovens

Model:

• PS640E Electric

Combinations:

• Single Oven

• Double Oven (Two-Stack)

• Triple Oven (Three-Stack)

OWNER'S OPERATING AND
INSTALLATION MANUAL

for domestic and standard export ovens

©2007 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 instructions

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

MAINENANCE 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 specifications at any time.

NOTICE

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

supervision of a factory certified installer.

NOTICE

A Middleby Marshall certified installer must be used to install and service this appliance.

NOTICE

This equipment is only for professional use and shall be used by qualified people.

RETAIN THIS MANUAL FOR FUTURE REFERENCE.

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

www.middleby.com

ii

Model No.
Modéle No.

Serial No.
Serié No.

Installation Date
Date d'installation

MIDDLEBY MARSHALL

O QUIBBLE LIMITED WARRANTY

N

(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

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 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, 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
profits of Buyer.

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

no quibble

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 factory-autho­rized installer.

Normal maintenance functions, including lubrication, adjustment of
airflow, 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 profits 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

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 Specifications .................................. 2

C. Gas Orifice and Pressure Specifications

for PS640 Electric Ovens .............................. 2

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

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

II. INSTALLATION KIT ................................................. 5

III. VENTILATION SYSTEM .......................................... 8

A. Requirements ................................................ 8

B. Recommendations ........................................ 8

C. Other Ventilation Concerns ........................... 8

IV. ASSEMBLY .............................................................. 9

A. Base Pad, Legs, Casters .............................. 9

B. Stacking ....................................................... 10

C. Restraint Cable Installation ......................... 10

D. Conveyor Installation .................................. 11

E. Standoff Installation .................................... 11

V. FINAL ASSEMBLY ................................................. 12

VI. ELECTRICAL SUPPLY .......................................... 13

Connection ....................................................... 13

UTILITY ROUGH-IN DIMENSIONS AND

POSITIONING FOR PS840-SERIES OVENS ....... 14

Circuit Breaker ................................................. 14

Electrical Specifications ................................... 14

Electrical Rating ............................................... 14

Supply Wire ...................................................... 14

Suggested ........................................................ 14

Page

SECTION 3 – OPERATION .............................................. 15

I. LOCATION AND DESCRIPTION OF CONTROLS 15

II. NORMAL OPERATION, STEP-BY-STEP ................ 16

A. Main Screen ................................................ 16

B. Daily Startup Procedure .............................. 17

C. Daily Shutdown Procedure ......................... 17

III. QUICK REFERENCE: TROUBLESHOOTING ...... 18

IV. SCREEN ALERTS ................................................. 18

SECTION 4 – MAINTENANCE ........................................ 19

I. MAINTENANCE – DAILY ....................................... 19

II. MAINTENANCE – MONTHLY ............................... 20

III. MAINTENANCE – EVERY 3 MONTHS ................. 21

IV. MAINTENANCE – EVERY 6 MONTHS ................ 22

V. KEY SPARE PARTS KIT ....................................... 23

SECTION 5 – TROUBLESHOOTING .............................. 24

SECTION 6 – ELECTRICAL WIRING DIAGRAM ............ 25

WIRING DIAGRAM, 640 Electric Oven, E208/240V,

50/60 Hz, 3 Ph .............................................................. 25

WIRING DIAGRAM, 640 Electric Oven, E380-480V,

50/60 Hz, 3 Ph .............................................................. 26

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.

iv

SECTION 1 – DESCRIPTION

I. OVEN USES

PS640 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 specifications for the oven that

affect installation and operation. Refer to Section 2,
lation for details.

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

oven. Refer to Section 3,

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

Not Shown:

K. Blowers: Project hot air from the burner or heating element

to the air fingers.

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

product.

Operation, for details.

Instal-

Figure 1-1. Oven Components

E

D

J

I

G

F

H

A

C

B

1

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)
Conveyor Width – belt width is 32″ 33-1/2″ (838mm) 33-1/2″ (838mm) 33-1/2″ (838mm)

or 2 × 15″ (381mm) or 2 × 15″ (381mm) or 2 × 15″ (381mm)

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 Specifications PS640 ELECTRIC

Weight 1150 lbs. (522kg)

Rated Heat Input 34.4 kW/hr (117,500 BTU, 29,610 kcal)

Maximum Operation Temperature 600°F / 315°C

Air Blowers Two Blowers at 1900 RPM

Warmup Time 15 min.

SERIES PS640 ELECTRICAL SPECIFICATIONS

Main Blower & Control Circuit Phase Frequency Amperage Poles Wires

Elements Voltage Voltage Draw

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

HEATER AMPERAGE

Voltage kW Amp Average Amps

208 34.4 75 37 37 37
240 34.4 65 33 33 33

(3 hot, 1 grd)

380V 208-240V 3 Ph 50/60 Hz 50 Amp 4 Pole 5 Wire

Voltage kW Amp Average Amps

380v 34.4 40-44 22 22 22

480V 208-240V 3 Ph 50/60 Hz 60 Amp 4 Pole 5 Wire

Voltage kW Amp Average Amps

480 34.4 32.5 28 28 28

IMPORTANT –

Additional electrical information is provided on the oven’s serial plate, and on the wiring diagram

inside the machinery compartment.

Wiring Diagrams are contained in Section 6 of this Manual

(3 hot, 1neut, 1 grd)

HEATER AMPERAGE

(3 hot, 1neut, 1 grd)

HEATER AMPERAGE

NOTE

and are also located inside the oven at the

bottom of the Control Panel

This Manual Must Be Kept For Future Reference

2

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-flammable flooring and any adjacent walls
must be non-flammable. Recommended minimum clearances are specified in the Description section of
this manual.

WARNING – Do not obstruct the flow of combustion and 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 fire, the appliance is to be mounted on floors of noncombustible construction with

noncombustible flooring and surface finish 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 requirements
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 Electrical
Code CSA C22.2.

3

PS640 OVEN INSTALLATION

REQUIRED KITS AND EQUIPMENT

PS640 PS640 PS640 PS640

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/N47810-0008 P/N59720 P/N59725 P/N59726

PS640 Single Electric Oven 1 1

PS640 Double Electric Oven 2 1

PS640 Triple Electric Oven 3 1

PARTS LIST FOR SERIES PS640 ELECTRIC OVEN

INSTALLATION KIT

P/N 47810-0008
(Two required for double oven)
(Three required for triple oven)

ITEM

NO. QTY PART NO. DESCRIPTION

1 1 55028 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 2-1. PS640-Series Electric Oven Installation Parts

3

1

2

5

4

4

HARDWARE BAG

5, 6, 7, 10 & 11

2

Figure 2-2. Model PS640 Single Oven

Option Base with Legs and Top

1

8

3

4

PARTS LIST FOR PS640 SERIES SINGLE OVEN OPTION - BASE w/15

P/N 59720

ITEM NO. QTY PART NO. DESCRIPTION

1 1 60287 COMPLETE BASE WELDMENT

2 4 37900-0024 TOP PLATE, LEG WELDMENT

3 2 22290-0009 SWIVEL CASTER W/BRAKE FLAT PLATE

4 2 22290-0010 SWIVEL CASTER FLAT PLATE

5 32 220373 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

″″

″ LEGS & TOP

″″

5

HARDWARE BAG

5, 6, 7, 10 & 11

2

Figure 2-3. Model PS640 Double Oven

Option Base with Legs and Top

1

8

3

4

PARTS LIST FOR PS640 SERIES DOUBLE OVEN OPTION - BASE w/6

P/N 59725

ITEM NO. QTY PART NO. DESCRIPTION

1 1 60287 COMPLETE BASE WELDMENT

2 4 37900-0102 TOP PLATE, LEG WELDMENT

3 2 22290-0009 SWIVEL CASTER W/BRAKE FLAT PLATE

4 2 22290-0010 SWIVEL CASTER FLAT PLATE

5 32 220373 3/8″-16 × 13 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

″″

″ LEGS & TOP

″″

6

Figure 2-4. Model PS640 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 PS640 SERIES TRIPLE OVEN OPTION - BASE w/CASTERS & TOP

P/N 59726

ITEM NO. QTY PART NO. DESCRIPTION

1 1 60287 COMPLETE BASE WELDMENT

2 4 45209 QUAD OUTRIGGER WELDMENT

3 2 22290-0009 SWIVEL CASTER, W/BRAKE FLAT PLATE

4 2 22290-0010 SWIVEL CASTER, FLAT PLATE

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

15 1 22450-0228 RESTRAINT CABLE ASSEMBLY

16 1 59560 TOP COVER
17 2 7A2S15 SCR, MS STR TRSHD 10-32X3/4″

2

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

7

III. VENTILATION SYSTEM

IMPORTANT

Where national or local codes re-

quire the installation of fire 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

B. Recommendations

NOTE THAT THE HOOD DIMENSIONS SHOWN IN
FIGURE 2-5 ARE
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 flow exhausted through the ventilation system
may vary depending on the oven configuration and hood
design. Consult the hood manufacturer or ventilation engineer
for these specifications.

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 heat­related 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.

RECOMMENDATIONS ONLY.

A. Requirements

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

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

STRONGLY

Figure 2-5. Ventilation System

18″ (458mm)

minimum
(Typical - both
ends of oven)

2″ (51mm)

minimum

NOTE:

C. Other ventilation concerns

• Special locations, conditions, or problems may require

• Inadequate ventilation can inhibit oven performance.

• It is recommended that the ventilation system and duct

Return air from the mechanically driven system must
not blow at the opening of the baking chamber. Poor
oven baking performance will result.

the services of a ventilation engineer or specialist.

work be checked at prevailing intervals as specified by the
hood manufacturer and/or HVAC engineer or specialist.

8″ (203mm)

minimum

3″ (76mm)

minimum

8

IV. ASSEMBLY

•

Figure 2-6. Leg extension and casters installation

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 finished 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″ flat 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.

Finished sides of

leg extension face

corner of base

pad

Lower

shelf

Domestic and

standard export

ovens:

Locking casters -

FRONT of oven

Non-locking casters -

REAR of oven

3/8″ flat

washer

3/8″ lock

washer

3/8″-16 × 1″

hex screw

Figure 2-7. Base pad Installation

Bottom oven

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

9

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 PS640
Gas oven cavities be stacked BY AUTHORIZED PERSONEL.

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 firmly 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.

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 without depending on the connector and the quick discon­nect device or its associated piping. 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 final
location. Adjust the bottom (hex) sections of the feet so that
the casters are off the floor. For quad ovens, lock the two
front casters.

Figure 2-10. Top panel installation

#10-32 × 2-1/2″

screw length

#10-32 × 3/4″

screw length

Top

panel

Figure 2-9. Stacking

Figure 2-11. Installing the Restraint Cable

Restraint cable assembly

3/8″-18 × 1″

eyebolt on

rear leg

extension

3/4″ (19mm)

eyebolt

Wall of structure

10

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 firmly 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 fingers. 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)

vertical

deflection

Adjustment

screws (2) on

idler end of

conveyor

11

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 flat on the floor.

• 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 find 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 filters

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 fitting 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 fitting.
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.

12

III. ELECTRICAL CONNECTION INFORMATION

FOR PS640E-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 require­ments 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)
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.

MUST be installed in the electric supply line for each

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 flexible cable(s) for the electrical power supply
conductors requires a 2″ (51mm) strain-relief fitting (not fur­nished) to enable 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 specifications). The electric
current rating for each conductor supplying a PS640E-Series
Oven must comply to local and national codes.

Typical specifications for each PS640E-Series Oven are
208V or 240V, 3-phase, 4-wire, 60-ampere, 34.4kW. A PS640E­Series 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

Electric Ovens

13

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS640-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).

NOT

Do

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

or

EXPORT: 380V elements, 3 Ph, 40 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

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

use conduit for ground.

NOT

use conduit for ground.

NOT

use conduit for ground.

NOT

use conduit for ground.

To Ove n

To Ove n

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

Figure 2-19. Typical PS640-Series Oven(s)

Installation

ELECTRICAL RATING

34.4 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.

14

Increase Decrease

A. Main On/Off Button

SECTION 3 - OPERATION

C. Temperature Control Display

E. Message Bar

D. TEMP Set

Left

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.

B. Conveyor Time Setting

Right

C. Temperature Control/Display

Displays the set point of the oven.

D. TEMP Set

Pressing on the “TEMP” button shows individual displays and
combined adjustments.

E. Message Bar

Indicates various messages pertaining to current oven
conditions.

15

NORMAL OPERATION - STEP-BY-STEP

A. Main Screen

1. When the unit has been “OFF” for more than 1 minute
the controller will display the screen saver, as shown in
Figure 3-1. To start operation, push the “Enter/Reset”
button. The controller will display the “OFF” screen, as
shown in Figure 3-2.

2. Push the “ON/OFF” button to start the oven. The con­troller will display the screen, as shown in Figure 3-3.

Figure 3-3 Main Screen ON

Figure 3-1 Screen Saver

©2005Middleby Corporation,All rightsreserved

Figure 3-2 Main Screen OFF

The Middleby Corporation

450 F

BELT 01 SPEED

OFF

4m. 30s.

The Middleby Corporation

1400T oastmaster Drive

E lgin, IL 60120

Phone: [phone]

Fax: [phone]

FRONT BELT JAMMED

450 F

BELT 01 SPEED

ON

ON/OFF button

3. To change the temperature, push the “TEMP” button. The
controller will display the screen, shown in
Figure 3-4. To change the temperature, push the “
arrow button. Then push either the “↑” arrow or “↓” arrow
buttons to increase or decrease temperatures respec­tively. When the proper temperature is entered, push the
“Enter/Reset” button. The controller will now show the
display shown in Figure 3-3.

Figure 3-4 Temperature Screen

4m. 30s.

←←

←”

←←

16

ON

TEMPERATURE SET UP

ACTUA L TEM P

133.8 F

450.0 F

TEMP Set button

4. To change the conveyor belt speed, push the “TIME”
button. The controller will display the screen, shown in
Figure 3-5. To change the minute setting, push the “
arrow button. Then push either the “↑” arrow or “↓” arrow
buttons to increase or decrease the time accordingly. To
change the second setting, push the “→” arrow button.
Then push either the “↑” arrow or “↓” arrow buttons to
increase or decrease the time accordingly. When the
proper times are entered, push the “ENTER/RESET” but­ton. The controller will now show the display shown in
Figure 3-3.

←←

←”

←←

Figure 3-5 Belt Speed Screen

Message Bar

LEFT FOR MINUTES - RIGHT FOR SECONDS

BELT 01 SPEED

4m. 30s.

C. Daily Shutdown Procedure

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

2. Press the “ON/OFF” button 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. TIME - See Separate Instructions.

3. TEMP - See Separate Instructions.

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. Actual temperature - Indicates current average tempera­ture of the right side of the oven.

2. Set point temperature - Pressing on this value allows the
user to adjust the set point of the oven.

3. 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 1200
RPM, while the oven maintains temperature and belt speed.

ON/OFF button

B. 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 the oven setting.
Set temperature 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.

TEMP button

TIME button

17

III. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM PROBLEM SOLUTION

Oven will not

turn On.

Oven will not

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

Make sure the emergenct stop button is on.

Faulty contactor

• Replace contactor.

heat.

Oven is operating, but

little or no air is coming

from the fingers.

Conveyor will not move.

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

• Replace element.

• Turn oven off, and allow to cool. Reassemble fingers
correctly.

blockage.

IV. SCREEN ALERTS

SYMPTOM PROBLEM SOLUTION

Battery Symbol in the

lower right hand corner

High Control Compartment

Temperature

The internal battery needs
to be replaced to retain en­ergy mode timings.

Clean rear grills. • Failure to do this will eventually shut down the oven due to

• A qualified service technician should accomplish this.

excessive temperature.

Control Over Temp Rear Grills are clogged. • Clean grills.

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.

18

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)

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.

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 (

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.

and disconnect the electric supply to the oven.

WARNING

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

CAUTION

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 discon-

nected, 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

Vents (2) on rear

of machinery
compartment

19

II. MAINTENANCE – MONTHLY

Figure 4-2. Removing Air Fingers and Plates

NOTE:

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

B. Remove the crumb trays from the oven.

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

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

NOTE:

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

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

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

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

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

Split belt conveyors can only be removed from the end
of the oven

Single-belt conveyor assemblies may be removed
from either end of the oven. If it is to be removed from
the end of the oven
drive motor sprocket as described in the
Installation instructions (in Section 2, Installation).

shown in Figure 1-1 (in Section 1,

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.

Installation).

with the drive motor.

without drive motor, remove the

Conveyor

Description).

Figure 4-3. Disassembling the Air Fingers

Example of markings:

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

G. Disassemble the air fingers 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 fingers.

CAUTION: Incorrect reassembly of the air fingers will change

the baking properties of the oven.

H. Clean the air finger 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 fingers. 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 Figure

2-14 (in Section 2,
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.

Installation). The belt should lift

20

III. MAINTENANCE – EVERY 3 MONTHS

A. Check that the oven is cool and the power is discon-

nected, 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, lubri-cate
both the extended shaft and the interior of the hollow
shaft using a light food-grade lubricant.
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.

Figure 4-4. Disassembling the idler shaft

DO NOT

8. Reassemble the idler shaft into the conveyor. Make
sure that the bronze washer is in place between the
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 configuration as follows:

High-speed conveyors are equipped with large flange
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 bush­ings 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.
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,
lift about 1″ (25mm). If necessary, adjust the belt
tension by turning the conveyor adjustment screws.

19. Replace all components onto the oven.

Installation). The belt should

Make

Figure 4-5. Drive shaft configurations

21

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) deflec­tion 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) deflection is
reached, then tighten the bolts.

Blower motor

Loosen four (4) screws to adjust

motor position and belt tension

IV. MAINTENANCE - EVERY 6 MONTHS

A. Check that the oven is cool and the power is discon-

nected, 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.

22

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

1

235

4

6

13, 14, 15, 16

8

7

9

18

10

19, 20, 21

11, 12

17

23

22

Figure 4-8. Key Spare Parts

ITEM QTY. P/N DESCRIPTION

1 1 60191 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 50610 AIR SWITCH

11 2 44914 CONTROLLER, POWER 208V/240V

12 2 44568 CONTROLLER, POWER 380V/480V

13 1 59942 HEATER 208V 34.4kW

14 1 60197 HEATER 240V 34.4kW

15 1 60198 HEATER 380V 34.4kW

16 1 50589 HEATER 480V 34.4kW

17 1 60091 PHOTOCELL

18 1 60638 INVERTER, PROGRAMMED

19 1 60683 PLC

20 1 58668 THERMOCOUPLE MODULE

21 1 58669 CURRENT MODULE

22 2 59132 RELAY, DPDT 24V COIL

23 1 M9608 POWER SUPPLY

23

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

preparation process.

If products still cook incorrectly,

call your Middleby Marshall

Service 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 fingers reassembled incorrectly,

after cleaning.

Assemble air fingers 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.

24

SECTION 6 - WIRING DIAGRAM

60227 Rev. A4

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

25

60231 Rev. A4

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

26

NOTES

27

WARNING

Improper installation, adjustment, alteration, service or maintenance

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

operating 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
parties other than your Middleby Marshall Authorized Service Agent may void your

warranty.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts

relieves the manufacturer of all warranty and liability.

NOTICE

Middleby Marshall reserves the right to change specifications 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