PS740 Series

Gas

Domestic & Std. Export

ENGLISH

PS740 Series Gas Ovens

Model: Combinations:

• PS740G Gas • 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 • (847)741-3300 • FAX (847)741-4406

P/N 60250

May, 2009 Rev. D

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.

Ovens are shipped from the factory configured for use with natural gas. If permitted by local, national and international codes, at the time of installation the oven may be converted to propane gas operation. This conversion requires the use of at Gas Conversion Kit that is supplied with the oven. For CE-approved ovens, the conversion is described in the Installation section of this Manual. For domestic and standard export ovens, instructions are included in the Gas Conversion Kit.

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

WARNING

POST, IN A PROMINENT LOCATION, THE EMERGENCY TELEPHONE NUMBER OF YOUR LOCAL GAS

SUPPLIER AND INSTRUCTIONS TO BE FOLLOWED IN THE EVENT YOU SMELL GAS.

Instructions to be followed in the event the user smells gas shall be obtained by consulting the local gas supplier. If the smell of gas is detected, immediately call the emergency phone number of your local Gas

Company. They will have personnel and provisions available to correct the problem.

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.

WARNING

DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.

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 INSTALL AND

PERFORM MAINENANCE AND REPAIRS AND IF NECESSARY TO CONVERT EQUIPMENT

FOR USE WITH OTHER GASES. 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

THIS EQUIPMENT IS ONLY FOR PROFESSIONAL USE AND SHALL BE USED

BY QUALIFIED PERSONNEL.

RETAIN THIS MANUAL FOR FUTURE REFERENCE.

Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 USA • (847)741-3300 • FAX (847) 741-4406 www.middleby.com

ii

Model No.

Modéle No.

Serial No.

Serié No.

MIDDLEBY MARSHALL

N

O

Q

UIBBLE

L

IMITED

W

ARRANTY

(U.S.A. O

NLY

)

MIDDLEBY MARSHALL, HEREINAFTER REFERRED TO

AS “THE SELLER”, WARRANTS EQUIPMENT MANUFAC-

TURED BY IT TO BE FREE FROM DEFECTS IN MATE-

RIAL AND WORKMANSHIP FOR WHICH IT IS RESPON-

SIBLE. THE SELLER’S OBLIGATION UNDER THIS WAR-

RANTY SHALL BE LIMITED TO REPLACING OR REPAIR-

ING, AT SELLER’S OPTION, WITHOUT CHARGE, ANY

PART FOUND TO BE DEFECTIVE AND ANY LABOR AND

MATERIAL EXPENSE INCURRED BY SELLER IN REPAIR-

ING 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 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.

Installation Date

Date d'installation

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 WHATSO-

EVER. 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. • (847) 741-3300 • FAX: (847) 741 4406 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. Gas Burner .................................................... 1

L. Blowers ......................................................... 1

M. Air Fingers ..................................................... 1

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

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

B. General Specifications .................................. 2

C. Electrical Specifications for

PS740 Gas Ovens ........................................ 2

D. Gas Orifice and Pressure Specifications for PS740 Gas Ovens ................................... 2

Page

SECTION 3 – OPERATION .............................................. 20

I.

LOCATION AND DESCRIPTION OF CONTROLS 20

II. NORMAL OPERATION, STEP-BY-STEP ................ 21

A. Main Screen ................................................ 21

B. Daily Startup Procedure .............................. 21

C. Daily Shutdown Procedure ......................... 21

III. QUICK REFERENCE: TROUBLESHOOTING ...... 22

IV. SCREEN ALERTS ................................................. 22

SECTION 4 – MAINTENANCE ........................................ 23

I.

MAINTENANCE – DAILY ....................................... 23

II. MAINTENANCE – MONTHLY ............................... 24

III. MAINTENANCE – EVERY 3 MONTHS ................. 25

IV. MAINTENANCE – EVERY 6 MONTHS ................ 26

V. KEY SPARE PARTS KIT ....................................... 27

SECTION 5 – ELECTRICAL WIRING DIAGRAM ............ 28

I.

WIRING DIAGRAM, 740 GAS OVEN, 208/240V,

50/60 Hz, 1 Ph ....................................................... 28

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 .......................................... 16

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

VII. GAS SUPPLY ........................................................ 17

A. Gas Utility Rough-In Recommendations ..... 17

B. Connection .................................................. 18

C. Gas Conversion .......................................... 18

D. Propane Conversion ................................... 18

E. Adjusting the Maximum Pressure Setting ... 18

F. Adjusting the Minimum Pressure Setting .... 19

G. Checkout ..................................................... 19

H. Maintenance ............................................... 19

NOTE

Wiring Diagrams are in Section 5 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

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 specifications 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.

Gas Burner (gas ovens): Heat air, which is then projected to the air fingers by the blowers.

L.

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

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

F

Figure 1-1. Oven Components

E

D

J

I

G

B

C

A

H

1

Gas

Type

G20

G25

G30

I. OVEN SPECIFICATIONS

Table 1-1 Dimensions

Overall Height

Overall Depth

Overall Length

Conveyor Width – belt width is 32

″

Shortened Exit Conveyor - 24 ″″″″″

Overall Depth

Overall Length

* All other dimension are the same

Recommended Minimum Clearances

Rear of Oven to Wall

Control end of conveyor to Wall

Non-control end of conveyor to Wall)

Table 1-2: General Specifications PS740 GAS

Weight

Single Oven

48-3/16

″ (1219mm)

60

″ (1524mm)

76-1/2 ″ (1930mm)

33-1/2

″ (838mm) or 2 × 15

″ (381mm)

Single Oven

52.75

″ (1340mm)

69 ″ (1753mm)

3 ″ (76mm)

1

″ (25.4mm)

1 ″ (25.4mm)

32

″″″″″ Belt

1150 lbs. (522kg)

Double Oven

62-3/4

″ (1575mm)

60

″ (1524mm)

76-1/2 ″ (1930mm)

33-1/2

″ (838mm) or 2 × 15

″ (381mm)

Double Oven

52.75

″ (1340mm)

69 ″ (1753mm)

3

1

1

″ (76mm)

″ (25.4mm)

″ (25.4mm)

Triple Ove

78-11/16

″ (1981mm)

60

″ (1524mm)

76-1/2 ″ (1930mm)

33-1/2

″ (838mm) or 2 × 15

″ (381mm)

Triple Ove

52.75

″ (1340mm)

69 ″ (1753mm)

3 ″ (76mm)

1

″ (25.4mm)

1 ″ (25.4mm)

24

″″″″″ Belt

1150 lbs. (522kg)

Rated Heat Input

Maximum Operation Temperature

Air Blowers

99,000 BTU (25,000kcal, 29 kW/hr)

600°F / 315°C

Two Blowers at 1900 RPM

99,000 BTU (25,000kcal, 29 kW/hr)

600°F / 315°C

Two Blowers at 1900 RPM

15 min.

Warmup Time 15 min.

Table 1-3: Electrical specifications for PS740G gas ovens

Main Blower

Voltage

208-240VAC

Control Circuit

Voltage

208-240VAC

Phase Freq Current

Draw

11-9.6 Amp

Poles Wires

1Ph 50/60Hz 2 Pole 3 Wire (2 hot, 1 gd)

Table 1-4: Gas orifice and pressure specifications for PS740G gas ovens

Gas

Type

Natural

Propane

Main Orifice I.D.

PS740G

0.1065

″ (0.120mm)

0.067

″ (1.9mm)

6-8

″ W.C. (14.9 - 19.9mbar)

11-14

Supply (Inlet)

Pressure

″ W.C. (27.4 - 34.9mbar)

Orifice (Manifold)

3.5

10.0

Pressure

″ W.C. (8.7mbar)

″ W.C. (24.9mbar)

0.25-0.3

0.9-1.0

Bypass

Pressure

″ W.C. (0.6-0.8 mbar)

″ W.C. (2.2-2.5 mbar)

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

machinery compartment.

GAS ORIFICE AND PRESSURE SPECIFICATIONS (PER OVEN CAVITY) - CE OVENS

Supply (Inlet) Pressure

Main

Orifice dia.

0.120

″

(3.05 mm)

0.120

″

(3.05 mm)

0.075

″

(1.9 mm)

IT,PT,ES,SE,

UK,CH,IT,AT,

DK,FI

I

2H

20 mbar

--

--

NL

I

2L

--

25 mbar

--

DE

I

2E

20 mbar

--

--

BE,FR

I

2E+

20 mbar

--

--

SE,CH,AT,DK,

FI,DE,NL

I

3B/P

--

--

29 or 50 mbar

BE,IE,IT,PT,

ES,UK

I

3+

--

--

28-30, 37 or 50 mbar

Orifice

(Manifold)

Pressure

11.21

mbar

16.19

mbar

26.2

mbar

Rated

Heat

Input

22.36

kW-hr.

22.36

kW-hr.

22.59

kW-hr.

NOTE

Wiring Diagrams are contained in Section 5 of this Manual and are also located inside the oven at the bottom of the Control Panel.

Additional electrical information is provided on the oven's serial plate.

This Manual Must Be Kept For Future Reference

2

SECTION 2 – INSTALLATION

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

• Perform a gas leak test.

• Test for proper combustion and gas supply.

• Test for correct air supply, particularly to the • Check that the ventilation system is in operation.

burner blower.

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. In the absence of local codes, gas oven installations must conform with the National Fuel Gas Code, ANSI Z223.1. Gas and 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. In the absence of local codes, gas oven installations must conform with the Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Gas

Installation Code, CAN/CGA-B149.2, as applicable. Gas and 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.

NOTE: In Australia, the oven installation must conform with local codes. In the absence of local codes, gas oven installations must conform with the requirements of AS5601/AG601, Gas, Electricity, and any other relevant statutory regulations.

3

TYPE OF INSTALLATION

PS740 Single Gas Oven

PS740 Double Gas Oven

PS740 Triple Gas Oven

PS740 24 ″″″″″ OVEN INSTALLATION

REQUIRED KITS AND EQUIPMENT

PS740

Gas Oven

Installation

Kit

P/N61452

1

2

3

PS740

Single Oven

Option Base w/

15

″ Legs,

Casters & Top

Kit

P/N61123

1

PS740

DoubleOven

OptionBase w/

6

″ Legs,

Casters & Top

Kit

P/N61457

1

PARTS LIST FOR SERIES PS740 GAS OVEN

INSTALLATION KIT

P/N 61452

(Two required for double oven)

(Three required for triple oven)

5

6

3

4

ITEM

NO.

1

2

QTY

1

1

1

1

1

1

PART NO.

22361-0001

61823

31461

42612

22500-0080

51054

DESCRIPTION

FLEXIBLE GAS HOSE

CONVEYOR END STOP

CONVEYOR LEFT REAR STOP

SERVICE AGENCY DIRECTORY

LABEL, MM

ASSY, HANDLE & DOOR

PS740

TripleOven

OptionBase w/

Casters& Top

Kit

P/N61458

1

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

1

3

2

6

5

4

4

TYPE OF INSTALLATION

PS740 Single Gas Oven

PS740 Double Gas Oven

PS740 Triple Gas Oven

PS740 OVEN INSTALLATION

REQUIRED KITS AND EQUIPMENT

PS740

Gas Oven

Installation

Kit

P/N61033

1

2

3

PS740

Single Oven

Option Base w/

15 ″ Legs,

Casters & Top

Kit

P/N59720

1

PS740

DoubleOven

OptionBase w/

6 ″ Legs,

Casters & Top

Kit

P/N59725

1

PARTS LIST FOR SERIES PS740 GAS OVEN

INSTALLATION KIT

P/N 61033

(Two required for double oven)

(Three required for triple oven)

5

6

3

4

ITEM

NO.

1

2

QTY

1

1

1

1

1

1

PART NO.

22361-0001

61823

55027

42612

22500-0080

51054

DESCRIPTION

FLEXIBLE GAS HOSE

CONVEYOR END STOP

CONVEYOR LEFT REAR STOP

SERVICE AGENCY DIRECTORY

LABEL, MM

ASSY, HANDLE & DOOR

PS740

TripleOven

OptionBase w/

Casters& Top

Kit

P/N59726

1

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

1 3

2

6

5

4

5

2

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

Option Base with Legs and Top

1

8

HARD WARE BA G

5, 6, 7, 10 & 11

3

4

12

9

PARTS LIST FOR PS740 SERIES 24

″″″″″ SINGLE OVEN OPTION - BASE w/15″″″″″ LEGS & TOP

P/N 61123

ITEM NO.

1

2

5

6

3

4

7

10

11

8

9

12

QTY

1

4

32

32

2

2

32

2

2

1

1

1

PART NO.

61126

37900-0024

22290-0009

22290-0010

2000531

21416-0001

21422-0001

22450-0228

61125

59677

7A2S15

61128

DESCRIPTION

COMPLETE BASE WELDMENT

TOP PLATE, LEG WELDMENT

SWIVEL CASTER W/BRAKE FLAT PLATE

SWIVEL CASTER FLAT PLATE

3/8 ″-16 × 1″ HEX SCREW, SST

3/8 ″ FLAT WASHER, SS

3/8 ″ SPLIT LOCK WASHER, ZP

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS SL TR HD 10-32 × 2-1/2 ″

SCR, MS STR TRSHD 10-32 × 3/4 ″

SUPPORT, SHELF

6

2

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

Option Base with Legs and Top

1

8

HARD WARE BA G

5, 6, 7, 10 & 11

3

4

12

9

PARTS LIST FOR PS740 SERIES 32

″″″″″ SINGLE OVEN OPTION - BASE w/15″″″″″ LEGS & TOP

P/N 59720

ITEM NO.

1

2

5

6

3

4

7

10

11

8

9

12

QTY

1

4

32

32

2

2

32

2

2

1

1

1

PART NO.

60287

37900-0024

22290-0009

22290-0010

2000531

21416-0001

21422-0001

22450-0228

59560

59677

7A2S15

59724

DESCRIPTION

COMPLETE BASE WELDMENT

TOP PLATE, LEG WELDMENT

SWIVEL CASTER W/BRAKE FLAT PLATE

SWIVEL CASTER FLAT PLATE

3/8 ″-16 × 1″ HEX SCREW, SST

3/8 ″ FLAT WASHER, SS

3/8 ″ SPLIT LOCK WASHER, ZP

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS SL TR HD 10-32 × 2-1/2 ″

SCR, MS STR TRSHD 10-32 × 3/4 ″

SUPPORT, SHELF

7

2

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

Option Base with Legs and Top

1

8

HARD WARE BA G

5, 6, 7, 10 & 11

3

4

12

9

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

P/N 61457

8

9

6

7

10

11

12

ITEM NO.

1

2

3

4

5

32

32

1

1

2

2

1

QTY

1

4

2

2

32

PART NO.

61126

37900-0102

22290-0009

22290-0010

2000531

21416-0001

21422-0001

22450-0228

61125

59677

7A2S15

61128

DESCRIPTION

COMPLETE BASE WELDMENT

TOP PLATE, LEG WELDMENT

SWIVEL CASTER W/BRAKE FLAT PLATE

SWIVEL CASTER FLAT PLATE

3/8 ″-16 × 1 HEX SCREW, SST

3/8

″ FLAT WASHER, SS

3/8 ″ SPLIT LOCK WASHER, ZP

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS SL TR HD 10-32 × 2-1/2 ″

SCR, MS STR TRSHD 10-32 × 3/4

″

SUPPORT, SHELF

8

2

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

Option Base with Legs and Top

1

8

HARD WARE BA G

5, 6, 7, 10 & 11

3

4

12

9

PARTS LIST FOR PS740 SERIES 32

″″″″″ DOUBLE OVEN OPTION - BASE w/6″″″″″ LEGS & TOP

P/N 59725

ITEM NO.

1

2

3

4

7

8

5

6

9

10

11

12

32

32

32

1

1

QTY

1

4

2

2

2

2

1

PART NO.

60287

37900-0102

22290-0009

22290-0010

2000531

21416-0001

21422-0001

22450-0228

59560

59677

7A2S15

59724

DESCRIPTION

COMPLETE BASE WELDMENT

TOP PLATE, LEG WELDMENT

SWIVEL CASTER W/BRAKE FLAT PLATE

SWIVEL CASTER FLAT PLATE

3/8

″-16 × 1 HEX SCREW, SST

3/8 ″ FLAT WASHER, SS

3/8 ″ SPLIT LOCK WASHER, ZP

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS SL TR HD 10-32 × 2-1/2

″

SCR, MS STR TRSHD 10-32 × 3/4 ″

SUPPORT, SHELF

9

2

6

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

Option Base with Outriggers and Top

1

15

HARDWARE BAG

7, 8, 9, 10, 11, 12,

13, 14, & 17

5

3

4

16

PARTS LIST FOR PS740 SERIES 24

″″″″″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP

P/N 61458

ITEM NO.

1

2

3

4

5

9

10

11

12

13

6

7

8

14

15

16

17

32

16

8

8

4

32

32

1

2

8

2

1

QTY

1

4

2

2

4

PART NO.

61126

45209

22290-0009

22290-0010

45206

45205

A27727

A21924

21422-0001

21172-0004

2001048

A27750

21422-0016

59677

22450-0228

61125

7A2S15

DESCRIPTION

COMPLETE BASE WELDMENT

QUAD OUTRIGGER WELDMENT

SWIVEL CASTER, W/BRAKE FLAT PLATE

SWIVEL CASTER, FLAT PLATE

INSERT,QUAD ADJUSTMENT FOOT

SPACER,QUAD CASTER

3/83 -16x1-1/4 HEX BOLT

3/83 FLAT WASHER, SS

3/83 SPLIT LOCK WASHER, ZP

3/83 -16 NYLON INSULATED LOCKNUT, ZC

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

1/23 18-8 FLAT WASHER

1/23 18-8 LOCK WASHER

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

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS STR TRSHD 10-32X3/4 ″

10

2

6

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

Option Base with Outriggers and Top

1

15

HARDWARE BAG

7, 8, 9, 10, 11, 12,

13, 14, & 17

5

3

4

16

PARTS LIST FOR PS740 SERIES 32

″″″″″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP

P/N 59726

ITEM NO.

1

2

3

4

8

9

10

11

12

5

6

7

13

14

15

16

17

32

32

16

8

8

4

4

32

8

2

1

1

2

QTY

1

4

2

2

PART NO.

60287

45209

22290-0009

22290-0010

45206

45205

A27727

A21924

21422-0001

21172-0004

2001048

A27750

21422-0016

59677

22450-0228

59560

7A2S15

DESCRIPTION

COMPLETE BASE WELDMENT

QUAD OUTRIGGER WELDMENT

SWIVEL CASTER, W/BRAKE FLAT PLATE

SWIVEL CASTER, FLAT PLATE

INSERT,QUAD ADJUSTMENT FOOT

SPACER,QUAD CASTER

3/83 -16x1-1/4 HEX BOLT

3/83 FLAT WASHER, SS

3/83 SPLIT LOCK WASHER, ZP

3/83 -16 NYLON INSULATED LOCKNUT, ZC

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

1/23 18-8 FLAT WASHER

1/23 18-8 LOCK WASHER

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

RESTRAINT CABLE ASSEMBLY

TOP COVER

SCR, MS STR TRSHD 10-32X3/4 ″

11

III. VENTILATION SYSTEM

IMPORTANT

Where national or local codes require the installation of fire suppression 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

CAUTION: Gas oven installations REQUIRE a mechanically driven ventilation system with electrical exhaust air sensing control.

A mechanically driven ventilation system is STRONGLY

RECOMMENDED for electric oven installations.

PROPER VENTILATION OF THE OVEN IS THE RESPONSI-

BILITY OF THE OWNER.

B.

Recommendations

NOTE THAT THE HOOD DIMENSIONS SHOWN IN

F I G U R E 2 - 5 A R E R E C O M M E N D A T I O N S O N L Y .

LOCAL, NATIONAL AND INTERNATIONAL CODES

M U S T B E F O L L O W E D W H E N I N S T A L L I N G T H E

VENTILATION SYSTEM. ANY APPLICABLE CODES

SUPERSEDE THE RECOMMENDATIONS SHOWN IN

THIS MANUAL. IN AUSTRALIA COMPLIANCE TO

REGULATIONS AS5601/AG601 IS MANDATORY.

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.

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 specified by the hood manufacturer and/or HVAC engineer or specialist.

Figure 2-5. Ventilation System

18

″ (458mm) minimum

(Typical - both ends of oven)

2

″ (51mm) minimum

8

″ (203mm) minimum

3 ″ (76mm) minimum

12

IV. ASSEMBLY

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.

Figure 2-7. Base pad Installation

Bottom oven• cavity

Figure 2-6. Leg extension and casters installation

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 2-8. Top panel installation

#10-32 × 2-1/2

″ screw length

#10-32 × 3/4 ″ screw length

Top panel

Assembled• base pad

13

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

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

14

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

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.

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.

Conveyor placed in oven

Figure 2-13. Conveyor placement

Crumb tray support bracket

End plug

Figure 2-12. Conveyor installation

Folded frame

Figure 2-14. Conveyor Belt tension

Idler end (with belt tension adjustment screws)

Drive end (with drive sprocket)

1

″ (25mm) vertical deflection

Adjustment screws (2) on idler end of conveyor

15

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

CORRECT master link position

Incorrect master link position

E.

Final Assembly

1.

Install the crumb trays underneath the conveyor as shown in Figure 2-16.

Figure 2-16. Crumb Trays

CONVEYOR BELT REVERSAL

Crumb tray insertion

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.

16

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.

Note: This is MUCH easier in reduced light.

Replace all covers.

VI. ELECTRICAL SUPPLY

WARNING: Authorized installation personnel normally accomplish the connections for the ventilation system, electric supply, and gas supply, as arranged by the customer. Following these connections, the factory-authorized installer can perform the initial startup of the oven.

NOTE: The electric supply installation must satisfy the requirements of the appropriate statutory authority such as the National Electrical Code, CSA C22.2; the Australian Code AG601; or other applicable regulations.

NOTE: The electric supply connection must meet all national and local electrical code requirements.

Check the oven serial plate before making any electric supply connections. Electric supply connections must agree with data

Figure 2-17. Utility Connection Locations for Gas Ovens

Strain-relief fitting

Electrical Junction Box

(One per oven cavity)

Gas Inlet

(One per Single, Double, or Triple Oven) on the oven serial plate. The location of the serial plate is shown in Figure 1-1 (in Section 1, Description).

A fused disconnect switch or a main circuit breaker (customer furnished) MUST be installed in the electric supply line for each oven cavity. It is recommended that the switch/circuit breaker have Lockout/Tagout capability.

The supply conductors must be of the size and material

(copper) recommended. Refer to the wiring diagram inside the machinery compartment of the oven. Electrical specifications are also listed on the oven’s serial plate and in Table 1-3,

Electrical Specifications (in Section 1, Description).

The oven requires a ground connection to the oven ground screw. For gas ovens, the screw is located in the electrical junction box (see Figure 2-14). If necessary, have the electrician supply the ground wire. Do NOT use the wiring conduit or other piping for ground connections.

Incoming electrical power lines are fed through the strain-relief fitting, shown in Figure 2-14. The electrical supply connections are made inside the electrical junction box. The power lines then connect to the oven circuits through safety switches located inside the machinery compartment and each blower motor compartment. These switches interrupt electrical power to the oven when the Machinery Compartment Access Panel is opened, OR when the rear panel is removed.

Connection

Refer to the wiring diagram inside the machinery compartment of the oven to determine the correct connections for the electrical supply lines. Connect the supply as indicated on the wiring diagram.

CAUTION: The terms of the oven’s warranty require all start-ups, conversions and service work to be performed by a Middleby Marshall Authorized

Service Agent.

VII. GAS SUPPLY

CAUTION: DURING PRESSURE TESTING NOTE ONE OF

THE FOLLOWING:

1.

The oven and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressure in excess of ½ psi (3.45 kPa).

2.

The oven must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressure equal to or less than ½ psi (3.45 kPa).

3.

If incoming pressure is over 14

″ W.C. (35mbar), a separate regulator MUST be installed in the line BE-

FORE the individual shutoff valve for the oven.

WARNING: To prevent damage to the control valve regulator during initial turn-on of gas, it is very important to open the manual shutoff valve very slowly.

17

After the initial gas turn-on, the manual shutoff valve must remain open except during pressure testing as outlined in the above steps or when necessary during service maintenance.

A. Gas Utility Rough-In Recommendations

The following gas system specifications are STRONGLY

RECOMMENDED. Deviating from these recommendations may affect the baking performance of the oven.

Gas Meter

Gas Line

• One or two cavities: 750 cfh meter

• Three oven cavities: 1200 cfh meter

• DEDICATED LINE from the gas meter to the oven

• 2 ″ (50.8mm) pipe for natural gas

• 2 ″ (50.8mm) pipe for propane

• Maximum length: 2002 (61m). Each 90°elbow equals 7 ″ (2.13m) of pipe.

B. Connection

Check the oven’s gas supply requirements before making the gas utility connection. Gas supply requirement are listed on the oven’s serial plate and in Table 1-4. Gas Orifice and Pressure

Specifications (in Section 1, Description).

Check the serial plate to determine the type of gas (Propane or

Natural) to be used with the oven.

Refer to the instructions in the gas hose package (included in the Installation Kit) before connecting the gas line. One gas line connection method is shown in Figure 2-18; however, compliance with the applicable standards and regulations is mandatory.

Inlet, regulated, and pilot gas pressure readings can be taken using a digital tube manometer at the tap location shown in Figure 2-19. Figure 2-19 shows the burner assembly and

Figure 2-21 shows the gas valve.

NOTE: The installation must conform with local codes or in the absence of local codes, with the National Fuel Gas

Code, ANSI Z223.1-latest edition.

Certain safety code requirements exist for the installation of gas ovens; refer to the beginning of Section 2 for a list of the installation standards. In addition, because the oven is equipped with casters, the gas line connection shall be made with a connector that complies with the Standard for Connectors for Movable Gas

Appliances, ANSI Z21.69 (in U.S.A.), as well as a quick-disconnect device that complies with the Standard for Quick-Disconnect

Devices for Use With Gas Fuel, ANSI Z21.41 (in U.S.A.).

C.

Gas Conversion

Where permitted by local and national codes, it is possible to convert ovens from natural to propane gas, or from propane to natural gas. Use the appropriate Middleby Gas Conversion Kit for the specific oven model.

CAUTION: The terms of the oven’s warranty require all startups, conversions and service work to be performed by a Middleby Authorized Service Agent.

D.

PS740 Propane Conversion

Two items have to be changed, to change the oven to LP:

1.

Replace main orifices.

2.

Adjust main gas regulator per instructions below.

Disconnect the manifold union closest to the main burner, and remove the manifold assembly (four screws). Slide out the manifold assembly (leaving the ignition and sense wires connected). Replace the main orifices.

Replace the main orifices on the manifold assemblies with the LP units, and replace the manifold assembly. Reconnect the union.

E.

Adjusting the Maximum Pressure Setting

1.

Disconnect pressure feedback connection (if appcable).

2.

Connect a suitable pressure gauge to pipe line or to outlet pressure tap of gas control concerned, to measure burner pressure (measuring point must be as near to burner as possible).

Figure 2-18. Flexible Gas Hose Installation

1/2

″ gas pipe nipple

1/2

″ gas line tee with pressure tap

Quickdisconnect device

3/4 ″-1/2″ gas pipe reducer

3/4 ″ gas pipe nipple

90°

Elbow

Flexible

Gas Hose

Figure 2-19. Gas Burner Assembly

Gas Burner

To Gas

Supply

Pipe

Full-Flow

Gas

Shutoff

Valve

Individual gas connection for each oven cavity

Manifold Pressure Tap

3.

Make sure that the appliance is in operation and the

Moduplus ® coil is energized with maximum current.

4.

If maximum rate pressure needs adjustment, use an 8 mm wrench to turn adjustment screw for maximum pressure setting (clockwise to increase or counter-clockwise to decrease pressure), until the desired maximum outlet pressure is obtained.

5.

Disconnect electrical connection of the Moduplus ® .

6.

Check minimum pressure setting and readjust if necessary. (See Adjusting Minimum Pressure Setting for proper adjusting procedure.)

7.

Reconnect pressure feedback connection (if appcable).

8.

If minimum and maximum pressures are set, wire the

Moduplus ® in circuit.

9. Close pressure tap screw.

18

Gas

Valve

Main•

Figure 2-20. Burner Assembly

Pressure•

Tap

Main•

Orifices

Gas Burner

Assembly

Figure 2-21. Gas Valve

Adjustment Screw (5 mm) for minimum pressure setting

Adjustment Screw

(8 mm) for maximum pressure setting

F.

Adjusting the Minimum Pressure Setting

1.

Disconnect pressure feedback connection (if appcable).

2.

Connect a suitable pressure gauge to pipe line or to outlet pressure tap of gas control concerned, to measure burner pressure (measuring point must be as near to burner as possible).

3.

Disconnect electrical connection of the Moduplus ® .

4.

Energize operator, set control in operation and wait until an outlet pressure is recorded on pressure gauge.

5.

If minimum rate pressure needs adjustment, use an 8 mm wrench to turn adjustment screw for minimum pressure setting (clockwise to increase or counter-clockwise to decrease pressure), until the desired minimum outlet pressure is obtained.

6.

Check if main burner lights easily and reliable at minimum pressure.

7.

Reconnect pressure feedback connection (if appcable).

8.

Close pressure tap screw.

G.

Checkout

After any adjustment, set appliance in operation and observe through a component cycle to ensure that burner system components function correctly.

NOTE: The installer MUST verify oven operation prior to putting oven into service.

H.

Maintenance

It is recommended to check yearly the minimum and the maximum setting and readjust them if necessary.

19

SECTION 3 - OPERATION

WARNING

DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.

C. Temperature Control/Display D. Message Bar

E. Energy Level

Indicators

E. Energy Level

Indicators

B. Conveyor Time Setting 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.

20

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 temperature of the right side of the oven.

2.

Left actual temperature - Indicates current average temperature 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 burners will completely shut off, allowing the oven to cool and the burners are on minimum flow. 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.

21

III. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM PROBLEM

Oven will not turn On.

No electrical power

SOLUTION

• Check that the circuit breaker/fused disconnect is on. Make sure the emergenct stop button is on.

Oven will not heat.

No gas pressure • Make sure main gas is on.

Oven is operating, but little or no air is coming from the fingers.

Conveyor will not move.

Burner did not light

Air fingers may be assembled incorrectly after cleaning.

Oven is not up to operating temperature.

• Turn oven off, and restart. If it still does not light, call for service.

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

• Allow oven to preheat.

Conveyor may be jammed.

• Turn oven off, and allow to cool. Check conveyor for blockage.

SCREEN ALERTS

SYMPTOM

High Control Compartment

Temperature

Main Blower problem or

Combustion Blower problem.

PROBLEM

Clean and replace the front fan filters.

The computer has detected a problem with either the main, or burner blowers.

SOLUTION

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

• This should be corrected by a qualified service technician.

Control Over Temp

Front belt jammed

Rear Belt jammed

High Temp Error

Belt off-Oven not in temperature

Energy Saving Mode 1

Energy saving mode 2

Energy saving Mode 3

Front filters are clogged

Front belt has stopped

Rear belt has stopped

Thermocouple or

PLC malfunction

Normal operation until

Oven reaches operating temperature

Normal operation

Normal Operation

Normal operation

• Clean or replace filters.

• Remove obstruction, and restart oven.

• If no obstruction, call service.

• Remove obstruction, and restart oven.

• If no obstruction, call service.

• Call service

22

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.

3.

If it is necessary to move a gas oven for cleaning or servicing, disconnect the gas supply before moving 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 gas supply.

4.

Reconnect the electrical supply.

5.

Turn on the full-flow gas safety valve. Test the gas line connections for leaks using approved leak test substances or thick soap suds.

6.

Turn on the electric supply circuit breaker(s).

7.

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 (2) on rear of oven and control compartment

Vent (1) on rear of machinery compartment

23

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 fingers 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.

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, 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 4-2. Removing Air Fingers and Plates

Figure 4-3. Disassembling the Air Fingers

24

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, lubri-cate 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.

Figure 4-4. Disassembling the idler shaft

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. 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 tension by turning the conveyor adjustment screws.

19. Replace all components onto the oven.

Figure 4-5. Drive shaft configurations

25

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

Blower motor

E. Blower Belt

1.

Remove the six 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.

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 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.

26

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

1 2 3 4 5

15

16, 17, 18

22

19

ITEM QTY.

22

23

24

15

16

17

18

11

12

13

14

19

20

21

7

8

5

6

9

10

3

4

1

2

1

1

1

2

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

20

21

Figure 4-8. Key Spare Parts

KEY SPARE PARTS PS740 GAS

P/N

50239

60679

60671

33983

32108

60684

58668

58669

60190

58920

58679

60194

M9608

60196

97525

51399

60598

57288

60250

59132

59668

48455

50240

60636

DESCRIPTION

Digital Display, Programmed

Motor, Conveyor Drive

Conveyor Control Board

Inverter, Programmed

Power Supply

Kit, Thermocouple

Fan Cooling Control

Fan Cooling Rear

Air Switch

Motor, Blower

Ignition Module

Assy, Valve Gas Modulating

Board, Signal Cond. 0-15VDC

High Limit Control Module,240V

Transformer,240Vp:24Vs

Control,C14RS Programmed

Thermocouple Module

Current Module

PhotoCell

Relay, DPDT 24V Coil

Belt, Blower

Ignitor, Single Rod

Ignition Cable, 25 ″

Bearing, PB 5/8 B

27

23

24

10

SECTION 5 - WIRING DIAGRAM

28

NOTES

29

NOTES

30

NOTES

31

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 • (847)741-3300 • FAX (847)741-4406

www.middleby.com