Middleby Marshall Oven 60254 User Manual

PS740 Series  
Electric  
Domestic & Std. Export  
ENGLISH  
P/N 60254  
September 28, 2012  
PS740 Series Electric Ovens  
Model:  
Combinations:  
Single Oven  
PS740E Electric  
Double Oven (Two-Stack)  
Triple Oven (Three-Stack)  
OWNER'S OPERATING AND  
INSTALLATION MANUAL  
for domestic and standard export ovens  
©2012 Middleby Marshall Inc.  
is a registered trademark of Middleby Marshall, Inc. All rights reserved.  
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • (847)741-3300 • FAX (847)741-4406  
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Model No.  
Modéle No.  
Serial No.  
Serié No.  
Installation Date  
Date d'installation  
MIDDLEBY MARSHALL  
No Quibble limited WarraNty  
(U.S.A. Only)  
MIDDLEBY MARSHALL 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’sobligationunderthiswarrantyshallbelimitedtoreplacingor  
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.  
MIDDLEBY MARSHALL, HEREINAFTER REFERRED TO  
AS “THE SELLER”, WARRANTS EQUIPMENT MANUFAC-  
TURED 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 MATE-  
RIAL 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 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,doormechanisms,microswitches,burnersand  
pilot burners, and replacement of light bulbs, fuses and indicating  
lights, are not covered by warranty.  
This warranty is valid only if the equipment is installed,  
started, and demonstrated under the supervision of a factory-  
authorized installer.  
Anyrepairsorreplacementsofdefectivepartsshallbeperformedby  
Seller’sauthorizedservicepersonnel.Sellershallnotberesponsible  
for any costs incurred if the work is performed by other than Seller’s  
authorized service personnel.  
Normal maintenance functions, including lubrication, clean-  
ing, or customer abuse, are not covered by this no quibble  
warranty.  
When returning any part under warranty, the part must be intact  
and complete, without evidence of misuse or abuse, freight prepaid.  
Seller shall be responsible only for repairs or replacements of  
defective parts performed by Seller’s authorized service per-  
sonnel. 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.  
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 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 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 shall be Seller’s sole and exclusive obliga-  
tion 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.  
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.  
This warranty is effective on Middleby Marshall equip-  
ment sold on, or after, February 15, 1995.  
The foregoing shall be Seller’s sole and exclusive obligation and  
Buyer’ssoleandexclusiveremedyforanyaction, whetherinbreach  
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  
P/N 60254 September 28, 2012  
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TABLE OF CONTENTS  
Page  
Page  
SECTION 3 – OPERATION ............................................. 19  
I. LOCATION AND DESCRIPTION OF CONTROLS 19  
II. NORMAL OPERATION, STEP-BY-STEP .............. 20  
A. Main Screen ................................................ 20  
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. Electrical Specifications for  
B. Daily Startup Procedure .............................. 20  
C. Daily Shutdown Procedure.......................... 20  
III. QUICK REFERENCE: TROUBLESHOOTING....... 21  
IV. SCREEN ALERTS.................................................. 21  
SECTION 4 – MAINTENANCE ........................................ 22  
I. MAINTENANCE – DAILY ....................................... 22  
II. MAINTENANCE – MONTHLY................................ 23  
III. MAINTENANCE – EVERY 3 MONTHS.................. 24  
IV. MAINTENANCE – EVERY 6 MONTHS.................. 25  
V. KEY SPARE PARTS KIT........................................ 26  
SECTION 5 – TROUBLESHOOTING............................... 27  
SECTION 6 – ELECTRICAL WIRING DIAGRAM ............ 28  
WIRING DIAGRAM, 740 Electric Oven, E208/240V,  
50/60 Hz, 3 Ph.............................................................. 28  
WIRING DIAGRAM, 740 Electric Oven, E380-480V,  
50/60 Hz, 3 Ph.............................................................. 29  
PS740 Electric Ovens ................................... 2  
SECTION 2 – INSTALLATION .......................................... 3  
I. BASE PAD KIT......................................................... 4  
II. INSTALLATION KIT.................................................. 6  
III. VENTILATION SYSTEM ........................................ 12  
A. Requirements.............................................. 12  
B. Recommendations ...................................... 12  
C. Other Ventilation Concerns ......................... 12  
IV. ASSEMBLY ............................................................ 13  
A. Base Pad, Legs, Casters............................. 13  
B. Stacking ....................................................... 14  
C. Restraint Cable Installation ......................... 14  
D. Conveyor Installation................................... 15  
E. Standoff Installation..................................... 15  
V. FINAL ASSEMBLY................................................. 16  
VI. ELECTRICAL SUPPLY .......................................... 17  
Connection ....................................................... 17  
UTILITY ROUGH-IN DIMENSIONS AND...................  
POSITIONING FOR PS840-SERIES OVENS................... 18  
Circuit Breaker.................................................. 18  
Electrical Specifications.................................... 18  
Electrical Rating ............................................... 18  
Supply Wire...................................................... 18  
Suggested ........................................................ 18  
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.  
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SECTION 1 – DESCRIPTION  
Figure 1-1. Oven Components  
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 ser-  
viceable parts are located in the machinery compartment.  
H. SerialPlate:Providesspecificationsfortheoventhataffect  
installation and operation. Refer to Section 2, Installation  
for details.  
I. Control Panel: Location of the operating controls for the  
oven. Refer to Section 3, Operation, for details.  
J. Photo Cell: Turns oven On when beam is interrupted.  
Not Shown:  
K. Blowers: Project hot air from the heating element to the  
air fingers.  
L. AirFingers:Projectstreamsofhotairontothefoodproduct.  
1
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I. OVEN SPECIFICATIONS  
Table 1-1 Dimensions  
Single Oven  
Double Oven  
Triple Oven  
Overall Height  
48-3/16(1219mm)  
60(1524mm)  
62-3/4(1575mm)  
60(1524mm)  
78-11/16(1981mm)  
60(1524mm)  
Overall Depth  
Overall Length  
76-1/2(1930mm)  
76-1/2(1930mm)  
76-1/2(1930mm)  
32Conveyor Model  
33-1/2(838mm)  
or 2 × 15(381mm)  
33-1/2(838mm)  
or 2 × 15(381mm)  
33-1/2(838mm)  
or 2 × 15(381mm)  
24Conveyor Model  
Overall Depth  
Single Oven  
Double Oven  
52.75(1340mm)  
69(1753mm)  
Triple Ove  
52.75(1340mm)  
69(1753mm)  
52.75(1340mm)  
69(1753mm)  
Overall Length  
* All other dimension are the same  
Recommended Minimum Clearances  
Rear of Oven to Wall  
3(76mm)  
3(76mm)  
3(76mm)  
Control end of conveyor to Wall  
Non-control end of conveyor to Wall)  
Table 1-2: General Specifications  
Weight  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
PS740 ELECTRIC  
1150 lbs. (522kg)  
Rated Heat Input  
27.0 kW/hr (92,128 BTU, 23,216 kcal)  
600°F / 315°C  
Maximum Operation Temperature  
Air Blowers  
Two Blowers at 1900 RPM  
Warmup Time  
15 min.  
SERIES PS740 ELECTRICAL SPECIFICATIONS  
Main Blower &  
Control Circuit  
Phase  
Frequency  
Amperage  
Poles  
Wires  
Elements Voltage  
Voltage  
Draw  
208-240V  
3 Ph  
50/60 Hz  
100 Amp  
3 Pole  
4 Wire  
(3 hot, 1 grd)  
HEATER AMPERAGE  
Voltage  
kW  
Average Amps  
208-240V  
L1  
85  
75  
L2  
75  
75  
L3  
75  
65  
208  
240  
27  
27  
208-240V  
3 Ph  
50/60 Hz  
75 Amp  
4 Pole  
4 Pole  
HEATER AMPERAGE  
kW  
380V  
480V  
5 Wire  
(3 hot, 1neut, 1 grd)  
Voltage  
Average Amps  
N
L1  
L2  
L3  
41  
380-480  
208-240V  
27  
51  
41  
10  
3 Ph  
50/60 Hz  
60 Amp  
HEATER AMPERAGE  
Voltage  
kW  
Average Amps  
N
5 Wire  
(3 hot, 1neut, 1 grd)  
L1  
43  
L2  
33  
L3  
33  
480  
27  
10  
IMPORTANT – Additional electrical information is provided on the oven’s serial plate, and on the wiring diagram  
inside the machinery compartment.  
NOTE  
Wiring Diagrams are contained in Section 6 of this Manual  
and are also located inside the oven at the  
bottom of the Control Panel  
This Manual Must Be Kept For Future Reference  
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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 ventilation air to and from your oven. There must be no obstruc-  
tions 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 con-  
struction shall in all cases extend not less than 12 inches (304mm) beyond the equipment on all sides.  
CAUTION: For additional installation information, contact your local Authorized Service Agent.  
NOTE – There must be adequate clearance between the oven and combustible construction. Clearance must  
also be provided for servicing and for proper operation.  
NOTE – An electrical wiring diagram for the oven is located inside the machinery compartment.  
NOTE: All aspects of the oven installation, including placement, utility connections, and ventilation requirements,  
must conform with any applicable local, national, or international codes. These codes supersede the require-  
ments and guidelines provided in this manual.  
NOTE: In the USA, the oven installation must conform to local codes. Electric ovens, when installed, must be  
electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electri-  
cal Code (NEC), or ANSI/NFPA70.  
NOTE: In Canada, the oven installation must conform with local codes. Electric ovens, when installed, must be  
electrically grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electri-  
cal Code CSA C22.2.  
3
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PS740 24OVEN INSTALLATION  
REQUIRED KITS AND EQUIPMENT  
PS740  
Electric Oven  
Installation  
Kit  
PS740  
Single Oven  
Option Base w/  
15Legs,  
Casters & Top  
Kit  
PS740  
DoubleOven  
OptionBase w/  
6Legs,  
Casters & Top  
Kit  
PS740  
TripleOven  
OptionBase w/  
Casters& Top  
Kit  
TYPE OF INSTALLATION  
P/N61453  
P/N61123  
P/N61457  
P/N61458  
PS740 Single Gas Oven  
PS740 Double Gas Oven  
PS740 Triple Gas Oven  
1
2
3
1
1
1
PARTS LIST FOR SERIES PS740 ELECTRIC OVEN  
INSTALLATION KIT  
P/N 61453  
(Two required for double oven)  
(Three required for triple oven)  
ITEM  
NO.  
QTY  
PART NO.  
61823  
DESCRIPTION  
1
2
3
4
5
1
1
1
1
1
CONVEYOR END STOP  
31461  
CONVEYOR LEFT REAR STOP  
SERVICE AGENCY DIRECTORY  
LABEL, MM  
42612  
22500-0080  
51054  
ASSY, HANDLE & DOOR  
Figure 2-1A. PS740-Series Electric Oven Installation Parts  
1
2
5
4
3
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PS740 OVEN INSTALLATION  
REQUIRED KITS AND EQUIPMENT  
PS740  
Electric Oven  
Installation  
Kit  
PS740  
Single Oven  
Option Base w/  
15Legs,  
Casters & Top  
Kit  
PS740  
DoubleOven  
OptionBase w/  
6Legs,  
Casters & Top  
Kit  
PS740  
TripleOven  
OptionBase w/  
Casters& Top  
Kit  
TYPE OF INSTALLATION  
P/N61824  
P/N67025  
P/N67026  
P/N66164  
PS740 Single Electric Oven  
PS740 Double Electric Oven  
PS740 Triple Electric Oven  
1
2
3
1
1
1
PARTS LIST FOR SERIES PS740 ELECTRIC OVEN  
INSTALLATION KIT  
P/N 61824  
(Two required for double oven)  
(Three required for triple oven)  
ITEM  
NO.  
QTY  
PART NO.  
61823  
DESCRIPTION  
1
2
3
4
5
1
1
1
1
1
CONVEYOR END STOP  
55027  
CONVEYOR LEFT REAR STOP  
SERVICE AGENCY DIRECTORY  
LABEL, MM  
42612  
22500-0080  
51054  
ASSY, HANDLE & DOOR  
Figure 2-1B. PS740-Series Electric Oven Installation Parts  
1
2
5
4
3
5
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Figure 2-2A. Model PS740 24Single Oven  
Option Base with Legs and Top  
1
8
HARDWARE BAG  
5, 6, 7, 10 & 11  
4
2
9
PARTS LIST FOR PS740 SERIES 24SINGLE OVEN OPTION - BASE w/15LEGS & TOP  
P/N 67027  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
64943  
COMPLETE BASE WELDMENT  
2
4
4
4
66851  
58930  
TOP PLATE, LEG WELDMENT  
SWIVEL CASTER FLAT PLATE  
3/8-16 × 1HEX SCREW, SST  
3/8FLAT WASHER, SS  
5
32  
32  
32  
1
2000531  
21416-0001  
21422-0001  
22450-0228  
61125  
6
7
3/8SPLIT LOCK WASHER, ZP  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
8
9
1
10  
11  
2
59677  
SCR, MS SL TR HD 10-32 × 2-1/2″  
SCR, MS STR TRSHD 10-32 × 3/4″  
2
7A2S15  
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Figure 2-2B. Model PS740 32Single Oven  
Option Base with Legs and Top  
1
8
HARDWARE BAG  
5, 6, 7, 10 & 11  
4
2
9
PARTS LIST FOR PS740 32SERIES SINGLE OVEN OPTION - BASE w/15LEGS & TOP  
P/N 67025  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
66159  
COMPLETE BASE WELDMENT  
2
4
4
4
66851  
58930  
TOP PLATE, LEG WELDMENT  
SWIVEL CASTER FLAT PLATE  
3/8-16 × 1HEX SCREW, SST  
3/8FLAT WASHER, SS  
5
32  
32  
32  
1
2000531  
21416-0001  
21422-0001  
22450-0228  
59560  
6
7
3/8SPLIT LOCK WASHER, ZP  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
8
9
1
10  
11  
2
59677  
SCR, MS SL TR HD 10-32 × 2-1/2″  
SCR, MS STR TRSHD 10-32 × 3/4″  
2
7A2S15  
7
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Figure 2-3A. Model PS740 24Double Oven  
Option Base with Legs and Top  
1
8
HARDWARE BAG  
5, 6, 7, 10 & 11  
4
2
9
PARTS LIST FOR PS740 SERIES 24DOUBLE OVEN OPTION - BASE w/6LEGS & TOP  
P/N 67028  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
64943  
COMPLETE BASE WELDMENT  
2
4
4
4
66853  
58930  
TOP PLATE, LEG WELDMENT  
SWIVEL CASTER FLAT PLATE  
3/8-16 × 1 HEX SCREW, SST  
3/8FLAT WASHER, SS  
5
32  
32  
32  
1
2000531  
21416-0001  
21422-0001  
22450-0228  
61125  
6
7
3/8SPLIT LOCK WASHER, ZP  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
8
9
1
10  
11  
2
59677  
SCR, MS SL TR HD 10-32 × 2-1/2″  
SCR, MS STR TRSHD 10-32 × 3/4″  
2
7A2S15  
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Figure 2-3B. Model PS740 32" Double Oven  
Option Base with Legs and Top  
1
8
HARDWARE BAG  
5, 6, 7, 10 & 11  
4
2
9
PARTS LIST FOR PS740 SERIES 32DOUBLE OVEN OPTION - BASE w/6LEGS & TOP  
P/N 67026  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
66159  
COMPLETE BASE WELDMENT  
2
4
4
4
66853  
58930  
TOP PLATE, LEG WELDMENT  
SWIVEL CASTER FLAT PLATE  
3/8-16 × 1 HEX SCREW, SST  
3/8FLAT WASHER, SS  
5
32  
32  
32  
1
2000531  
21416-0001  
21422-0001  
22450-0228  
59560  
6
7
3/8SPLIT LOCK WASHER, ZP  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
8
9
1
10  
11  
2
59677  
SCR, MS SL TR HD 10-32 × 2-1/2″  
SCR, MS STR TRSHD 10-32 × 3/4″  
2
7A2S15  
9
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Figure 2-4A. Model PS740 24Triple Oven  
Option Base with Outriggers and Top  
1
15  
HARDWARE BAG  
7, 8, 9, 10, 11, 12,  
13, 14, & 17  
5
3
6
2
4
16  
PARTS LIST FOR PS740 SERIES 24TRIPLE OVEN OPTION - BASE w/CASTERS & TOP  
P/N 64946  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
64943  
COMPLETE BASE WELDMENT  
2
3
4
2
45209  
22290-0010  
22290-0009  
45206  
QUAD OUTRIGGER WELDMENT  
SWIVEL CASTER, FLAT PLATE  
SWIVEL CASTER, FLAT PLATE, W/BRAKE  
INSERT,QUAD ADJUSTMENT FOOT  
SPACER,QUAD CASTER  
4
2
5
4
6
4
45205  
7
32  
32  
32  
16  
8
A27727  
3/83 -16x1-1/4 HEX BOLT  
8
A21924  
3/83 FLAT WASHER, SS  
9
21422-0001  
21172-0004  
2001048  
A27750  
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  
10  
11  
12  
13  
14  
15  
16  
17  
8
8
21422-0016  
59677  
1/23 18-8 LOCK WASHER  
2
SCR, MS SL TR HD 10-32X2-1/2  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
1
22450-0228  
61125  
1
2
7A2S15  
SCR, MS STR TRSHD 10-32X3/4″  
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Figure 2-4B. Model PS740 32Triple Oven  
Option Base with Outriggers and Top  
1
15  
HARDWARE BAG  
7, 8, 9, 10, 11, 12,  
13, 14, & 17  
5
3
6
2
4
16  
PARTS LIST FOR PS740 SERIES 32TRIPLE OVEN OPTION - BASE w/CASTERS & TOP  
P/N 66164  
ITEM NO.  
QTY  
PART NO.  
DESCRIPTION  
1
1
66159  
COMPLETE BASE WELDMENT  
2
3
4
2
45209  
22290-0010  
22290-0009  
45206  
QUAD OUTRIGGER WELDMENT  
SWIVEL CASTER, FLAT PLATE  
SWIVEL CASTER, FLAT PLATE, W/BRAKE  
INSERT,QUAD ADJUSTMENT FOOT  
SPACER,QUAD CASTER  
4
2
5
4
6
4
45205  
7
32  
32  
32  
16  
8
A27727  
3/83 -16x1-1/4 HEX BOLT  
8
A21924  
3/83 FLAT WASHER, SS  
9
21422-0001  
21172-0004  
2001048  
A27750  
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  
10  
11  
12  
13  
14  
15  
16  
17  
8
8
21422-0016  
59677  
1/23 18-8 LOCK WASHER  
2
SCR, MS SL TR HD 10-32X2-1/2  
RESTRAINT CABLE ASSEMBLY  
TOP COVER  
1
22450-0228  
59560  
1
2
7A2S15  
SCR, MS STR TRSHD 10-32X3/4″  
11  
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NOTE THAT THE HOOD DIMENSIONS SHOWN IN  
FIGURE 2-5 ARE RECOMMENDATIONS ONLY.  
LOCAL, NATIONAL AND INTERNATIONAL CODES  
MUST BE FOLLOWED WHEN INSTALLING THE  
VENTILATION SYSTEM. ANY APPLICABLE CODES  
SUPERSEDE THE RECOMMENDATIONS SHOWN IN THIS  
MANUAL.  
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  
The rate of air flow exhausted through the ventilation system  
may vary depending on the oven configuration and hood de-  
sign. 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  
heat- related problems to the oven components as if there  
were no ventilation at all. The best method of supplying return  
air is through the heating, ventilation and air conditioning  
(HVAC) system. Through the HVAC system, the air can be  
temperature-controlled for summer and winter. Return air can  
also be brought in directly from outside the building, but detri-  
mental effects can result from extreme seasonal hot and cold  
temperatures from the outdoors.  
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  
NOTE: Return air from the mechanically driven system must  
not blow at the opening of the baking chamber. Poor  
oven baking performance will result.  
A. Requirements  
A mechanically driven ventilation system is STRONGLY  
RECOMMENDED for electric oven installations.  
C. Other ventilation concerns  
PROPER VENTILATION OF THE OVEN IS THE RESPON-  
SIBILITY OF THE OWNER.  
Special locations, conditions, or problems may require the  
services of a ventilation engineer or specialist.  
B. Recommendations  
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)  
3(76mm)  
minimum  
2(51mm)  
minimum  
8(203mm)  
minimum  
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Figure 2-6. Leg extension and casters installation  
IV. ASSEMBLY  
A. Top Panel and Base Pad Assembly  
1. Install the four leg extensions onto the base pad using  
the 3/8-16 × 1screws, 3/8flat washers, and  
3/8lockwashers supplied in the Base Pad Kit. See  
Figure2-6. Checkthatthenishedsidesofeachlegexten-  
sion face OUTWARDS. One rear leg should be attached  
using three 3/8-16 × 1screws and the 3/4eyebolt, as  
shown in Figure 2-6. This eyebolt acts as the anchor point  
for the restraint cable assembly (see Part C, Restraint  
Cable Installation).  
1/2flat  
washer  
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.  
1/2lock  
washer  
1/2-13 × 1-1/4″  
hex screw  
3. Install one caster onto each leg extension, as shown in  
Figure 2-7. Use the 3/8-16 × 1screws, 3/8flat wash-  
ers, and 3/8lockwashers 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  
Figure 2-8. Top panel installation  
Bottom oven�  
cavity  
#10-32 × 2-1/2″  
Top  
screw length  
panel  
#10-32 × 3/4″  
screw length  
Assembled�  
base pad  
13  
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C. Restraint Cable Installation  
NOTE: DO NOT install top panel onto double or triple  
ovens until AFTER stacking the oven cavities. See  
Part B, Stacking.  
Because the oven is equipped with casters, a restraint cable  
assembly must be installed to limit the movement of the appli-  
ance. 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.  
B. Stacking  
For single ovens, skip ahead to Part C, Restraint Cable  
Installation.  
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.  
IMPORTANT  
Middleby Marshall STRONGLY RECOMMENDS that PS740  
Electric oven cavities be stacked BY AUTHORIZED PERSO-  
NEL.  
Figure 2-10. Top panel installation  
Contact your Middleby Marshall Authorized Service Agent for  
complete stacking instructions.  
1. Stack an oven cavity on top of the lower oven. Check  
#10-32 × 2-1/2″  
screw length  
Top  
panel  
the following:  
#10-32 × 3/4″  
screw length  
• 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.  
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  
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D. Conveyor Installation  
Figure 2-13. Conveyor placement  
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.  
Crumb tray  
support  
2. Continuemovingtheconveyorintotheovenuntiltheframe  
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.  
bracket  
End plug  
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.  
Conveyor  
placed in  
oven  
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  
Figure 2-14. Conveyor Belt tension  
Idler end (with belt tension  
adjustment screws)  
1(25mm) verti-  
cal deflection  
Adjustment  
screws (2) on  
idler end of  
conveyor  
Drive end (with  
drive sprocket)  
15  
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5. Ifitisnecessarytoaddorremoveconveyorlinkstoachieve  
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:  
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.  
• Removetheconveyorassemblyfromtheovenandplace  
it flat on the floor.  
REVERSING THE CONVEYOR BELT  
• Remove the master links using long-nose pliers. Then,  
roll up the belt along the length of the conveyor frame.  
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.  
• Add or remove belt links as necessary to achieve the  
correct belt tension.  
• Replace the belt on the conveyor frame. Check that the  
conveyorbeltlinksareorientedasshowninFigure2-15,  
and that the smooth side of the conveyor belt faces UP.  
RESETTING DIRECTION JUMPER  
• Connect the inside master links. Check that the links  
are oriented as shown in Figure 2-15.  
Locate Jumper P1 on the conveyor control board. Move jumper  
from terminals 1 and 2, and replace onto terminals 2 and 3.  
• 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.  
CAUTION: Shock hazard in compartments electrical filters  
are electrically alive.  
• Replace the conveyor into the oven.  
SWITCHING PHOTO DETECTOR  
Figure 2-15. Conveyor and Master Link orientation  
CAUTION: Disconnect Power Before Switching Photo eye.  
Direction  
of travel  
CORRECT  
master link  
position  
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.  
Incorrect  
master link  
position  
Ontheoppositecontrolbox, removethetwoscrewsholdingthe  
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.  
E. Final Assembly  
1. Install the crumb trays underneath the conveyor as shown  
in Figure 2-16.  
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.  
Figure 2-16. Crumb Trays  
Applypowertotheunit.Adjustthephotoeyeheightbyloosening  
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.  
Crumb tray  
insertion  
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III. ELECTRICAL CONNECTION INFORMATION  
FOR PS740E-SERIES OVENS.  
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  
and480VAC.(Theseovenshavea5-wiresystem.)A2(51mm)  
diametercutout/holeinthebackofthemachinerycompartment  
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 en-  
able safe access to the terminal block from which oven power  
is distributed.  
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.  
The supply conductors must be of the size and material (cop-  
per) recommended to provide the current required; (refer to the  
data plate for the ampere specifications). The electric current  
rating for each conductor supplying a PS740E-Series Oven  
must comply to local and national codes.  
Check the oven data plate (Figure 2-17) before making any  
electric supply connections. Electric supply connections must  
agree with data on the oven data plate.  
NOTE: The electric supply installation must satisfy the require-  
mentsoftheappropriatestatutoryauthority,suchastheNational  
Electrical Code (NEC), ANSI/NFPA70, (U.S.A.); the Canadian  
Electrical Code, CSA C22.2; the Australian Code AG601; or  
other applicable regulations.  
Typical specifications for each PS740E-Series Oven  
are 208V or 240V, 3-phase, 4-wire, 60-ampere, 34.4kW. A  
PS740E-Series Double Oven (Figure 1-2) installation would  
require two 60-ampere service connections, one for each  
oven; the 34.4kW power consumption also doubles for such  
an installation to 68.8kW.  
A fused disconnect switch or a main circuit breaker (customer  
furnished) MUST be installed in the electric supply line for  
each oven; it is recommended that this switch/ circuit breaker  
have lockout/tagout capability. The electric supply connection  
must meet all national and local electrical code requirements.  
Copper is the recommended material for the electrical supply  
conductors.  
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 2-18. Utility Connection Locations for Elec-  
tric Ovens  
Figure 2-17. Typical Electric Oven Data Plate  
17  
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UTILITY ROUGH-IN DIMENSIONS AND POSITIONING  
FOR PS740-SERIES OVENS  
WARNING  
DO NOT USE CONDUIT FOR GROUND  
CONNECTION.  
To Oven  
CAUTION  
IT IS RECOMMENDED THAT THE OVEN  
BE PLACED UNDER A VENTILATION  
HOOD FOR ADEQUATE AIR SUPPLY  
AND VENTILATION.  
To Oven  
ELECTRIC SUPPLY TO BE  
PROVIDED BY CUSTOMER  
Suggested dimensions are shown; utility code  
requirements supersede any factors shown.  
CIRCUIT BREAKER  
Figure 2-19. Typical PS740-Series Oven(s)  
Installation  
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 RATING  
27.0 kW/hr.  
ELECTRICAL SPECIFICATIONS  
SUPPLY WIRE  
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).  
Supply wire size must be in accordance with the National  
Electrical Code (current edition) and must be in compliance  
with local codes.  
Do NOT use conduit for ground.  
NOTE:TheelectricalterminalconnectionmarkedMPlocated  
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.  
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).  
SUGGESTED  
Do NOT use conduit for ground.  
If space permits, service should be located near the control  
console end of the oven(s) to allow convenient access to  
safety switches.  
or  
EXPORT: 380V elements, 3 Ph, 41 Amp draw, 50/60 Hz,  
208-240V control circuit and main blower motor, 4 pole,  
5 wire system per oven (3 hot, 1 neutral, 1 grd).  
Do NOT use conduit for ground.  
or  
DOMESTIC: 480V elements, 3 Ph, 32.5 Amp draw,  
50/60 Hz, 208-240V control circuit and main blower motor,  
4 pole, 5 wire system per oven (3 hot, 1 neutral, 1 grd).  
Do NOT use conduit for ground.  
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SECTION 3 - OPERATION  
C. Temperature Control/Display  
D. Message Bar  
E. Energy Level  
E. Energy Level  
Indicators  
Indicators  
B. Conveyor Time Setting  
A. Main On/Off Button  
I. LOCATION AND DESCRIPTION OF CONTROLS  
A. Main On/Off Button  
Displays the average set point of both right and left sides of  
theoven. Pressingonthedisplayallowsindividualtemperature  
displays and adjustments.  
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.  
D. Message Bar  
Displays messages during oven operation.  
E. Energy Level Indicators  
B. Conveyor Time Setting  
Adjusts and displays the conveyor bake time. Dual belt ovens  
have two displays, single units have one.  
Displays energy usage on left and right sides of the oven.  
C. Temperature Control/Display  
19  
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II. NORMAL OPERATION - STEP-BY-STEP-  
perature of the left side of the oven.  
A. Daily Startup Procedure  
NOTE: Right to Left temperature settings should not exceed  
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.  
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.  
2. Adjust the conveyor to the desired bake time.  
4. Left Set point temperature - Pressing on this value allows  
3. Press the temperature button to display right and left hand  
the user to adjust the set point for the left side of the oven.  
oven settings. Set temperatures as desired.  
5. Exit - Returns to the main screen.  
4. Press the ON button to activate the oven. The conveyor  
will not run, until the oven temperature has reached the  
set points.  
C. Energy Modes  
B. Daily Shutdown Procedure  
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.  
1. Make certain there are no products left on the conveyor  
in the oven.  
2. Press the ON square to turn the oven off.  
Energy Mode Two - The oven lowers its set point by 100°  
F, and stops the belt. Anytime that the oven is more than 10  
degrees over its set point, the ovens will completely shut off,  
allowing the oven to cool. The main blowers will continue to run  
at 1500 RPM in this mode. Placing any article on the input belt  
willcausenormaloperationoftheoventoresume,andbringthe  
setpointbacktoitsoriginallevel. Thebeltwillresumeoperation  
once both sides of the oven are within 5° F of the set point.  
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. Conveyorspeed-Pressingoneithertheminutesorseconds  
allows a new value to be input for the conveyor speed.  
Split belt ovens have two inputs (front and rear belts).  
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 opera-  
tion once both sides of the over are within 5° F of the set point.  
3. Oven temperature - Pressing on the set temperature shifts  
theusertotheoventemperaturesetpoint/indicatorscreen.  
4. Energy level indicators - Indicators to either side of the  
screen indicate the energy input to that side of the oven.  
Energy Mode Four - This is a complete oven shut down. Plac-  
ing 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.  
5. Message bar - Indicates various messages pertaining to  
current oven conditions.  
B. Oven Temperature/Set Point/Indicator Screen  
1. Right actual temperature - Indicates current average tem-  
perature of the right side of the oven.  
2. Left actual temperature - Indicates current average tem-  
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III. QUICK REFERENCE: TROUBLESHOOTING  
SYMPTOM  
PROBLEM  
SOLUTION  
Oven will not  
turn On.  
No electrical power  
Check that the circuit breaker/fused disconnect is on. Make  
sure the emergenct stop button is on.  
Oven will not  
heat.  
Faulty contactor  
Replace contactor.  
Faulty heater element  
Replace element.  
Oven is operating, but little  
or no air is coming from  
the fingers.  
Air fingers may be as-  
sembled incorrectly after  
cleaning.  
Turnovenoff, andallowtocool. Reassemblengerscorrectly.  
Conveyor will not move.  
Conveyor may be jammed.  
Turnovenoff, andallowtocool. Checkconveyorforblockage.  
SCREEN ALERTS  
SYMPTOM  
PROBLEM  
SOLUTION  
High Control Compartment  
Temperature  
Clean and replace the front  
fan filters.  
Failure to do this will eventually shut down the oven due to  
excessive temperature.  
Main Blower problem  
or Combustion Blower  
problem.  
The computer has detected  
a problem with either the  
main, or burner blowers.  
This should be corrected by a qualified service technician.  
Control Over Temp  
Front belt jammed  
Front filters are clogged  
Front belt has stopped  
Clean or replace filters.  
Remove obstruction, and restart oven.  
If no obstruction, call service.  
Rear Belt jammed  
High Temp Error  
Rear belt has stopped  
Remove obstruction, and restart oven.  
If no obstruction, call service.  
Thermocouple or  
PLC malfunction  
Call service  
Belt off-Oven not  
in temperature  
Normal operation until  
Oven reaches operating  
temperature  
Energy Saving Mode 1  
Energy saving mode 2  
Normal operation  
Normal operation  
Energy saving Mode 3  
Normal operation  
21  
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SECTION 4 - MAINTENANCE  
WARNING  
Before ANY cleaning or servicing of the oven, perform the following procedure:  
1. Switch off the oven and allow it to cool. Do NOT service the oven while it is warm.  
2. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven.  
When all cleaning and servicing is complete:  
1. If the oven was moved for servicing, return the oven to its original location.  
2. If the restraint cable was disconnected to clean or service the oven, reconnect it at this time.  
3. Reconnect the electrical supply.  
4. Turn on the electric supply circuit breaker(s).  
5. Perform the normal startup procedure.  
WARNING  
Possibility of injury from moving parts and electrical shock exists in this oven. Switch off and lockout/tagout the  
electric supply BEFORE beginning to disassemble, clean, or service any oven. Never disassemble or clean an  
oven with the BLOWER ( ) switch or any other circuit of the oven switched on.  
CAUTION  
NEVER use a water hose or pressurized steam-cleaning equipment when cleaning this oven. To avoid saturating the oven  
insulation, DO NOT use excessive amounts of water. DO NOT use a caustic oven cleaner, which can damage the bake  
chamber surfaces.  
NOTE  
ANY replacement parts that require access to the interior of the oven may ONLY be replaced by a Middleby Marshall Autho-  
rized 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  
Figure 4-1. Cooling Vents and Grills  
A. Check that the oven is cool and the power is disconnected,  
asdescribedinthewarningatthebeginningofthisSection.  
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  
bereplacedIMMEDIATELY. Operatingtheoven  
without adequate cooling can seriously damage  
the oven's internal components.  
Vents on  
front panel  
of oven  
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.  
Fan grills (3) on rear  
of oven and control  
compartment  
Vent (2) on rear  
of machinery  
compartment  
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Figure 4-2. Removing Air Fingers and Plates  
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 Sec-  
tion.  
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  
drivechain.Then,removethedrivechainfromtheconveyor  
sprocket.  
D. Slidetheconveyoroutoftheoven,foldingitasitisremoved.  
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:  
Figure 4-3. Disassembling the Air Fingers  
(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  
EACHFINGERISDISASSEMBLED, WRITETHELOCA-  
TION CODE” FOR THE FINGER ON ALL THREE OF ITS  
PIECES. This will help you in correctly reassembling the  
air fingers.  
CAUTION: Incorrectreassemblyoftheairngerswillchange  
the baking properties of the oven.  
H. Cleantheairngercomponentsandtheinteriorofthebaking  
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. Reassembletheconveyorintotheoven. Ifthedrivesprocket  
was removed when installing the conveyor, replace it at  
this time.  
L. Reattach the drive chain.  
M. Check the tension of the conveyor belt as shown in Fig-  
ure 2-14 (in Section 2, Installation). The belt should lift  
between 3 - 4(75-100mm). DO NOT OVERTIGHTEN  
THECONVEYORBELT. Ifnecessary, thebelttensioncan  
be adjusted by turning the conveyor adjustment screws,  
located at the idler (right) end of the conveyor.  
N. Replace the crumb trays.  
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two sections of the shaft. See Figure 4-4.  
III. MAINTENANCE – EVERY 3 MONTHS  
9. Replacetheconveyoradjustmentscrewsasshownin  
Figure4-4. Toallowtheconveyorbelttobereinstalled  
later, do not tighten the screws at this time.  
A. Check that the oven is cool and the power is disconnected,  
asdescribedinthewarningatthebeginningofthisSection.  
B. Vacuum both of the blower mounts, and their surrounding  
10. Loosen the set screw on both of the conveyor drive  
sprockets.Then,removethesprocketsfromtheshaft.  
compartments, using a shop vacuum.  
C. Tighten all electrical terminal screws.  
11. Check the conveyor configuration as follows:  
D. Split Belt Disassembly and Cleaning  
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.  
1. Refer to Part D, Conveyor Installation, in the Installa-  
tionsectionofthisManual.Then,removethefollowing  
components from the oven:  
• Conveyor end stop  
• Crumb trays  
Standard conveyors are equipped with bronze bush-  
ings mounted on spacers at both ends of the shaft,  
as shown in Figure 4-5. For these conveyors, 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 as-  
sembly free of the conveyor frame. The brackets will  
be removed along with the drive shaft assembly.  
• Chain cover  
• Drive chains  
• End plugs  
• Conveyor assembly  
2. Remove the master links from each conveyor belt.  
Then, rollthebeltsupalongthelengthoftheconveyor  
to remove them from the frame.  
12. Disassemble and lubricate the two sections of the  
3. Removethetwoconveyoradjustmentscrewsfromthe  
idler end of the conveyor frame, as shown in Figure  
4-4.  
drive shaft as described for the idler shaft, above.  
13. Before reassembling the shafts into the conveyor  
frame, check that they are oriented properly.  
4. Remove the idler shaft assembly from the conveyor.  
5. Pull apart the two sections of the idler shaft.  
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.  
6. Clean the shafts thoroughly using a rag. Then, lubri-  
cate both the extended shaft and the interior of the  
hollowshaftusingalightfood-gradelubricant.DONOT  
lubricate the shafts using WD40 or a similar product.  
This can cause the shafts to wear rapidly.  
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.  
7. Before reassembling the shafts into the conveyor  
18. Check the tension of the conveyor belt as shown in  
Figure2-14(inSection2,Installation).Thebeltshould  
lift about 1(25mm). If necessary, adjust the belt ten-  
sion by turning the conveyor adjustment screws.  
frame, check that they are oriented properly.  
8. Reassemble the idler shaft into the conveyor. Make  
sure that the bronze washer is in place between the  
Figure 4-4. Disassembling the idler shaft  
19. Replace all components onto the oven.  
Figure 4-5. Drive shaft configurations  
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Figure 4-7. Rear panel access  
Figure 4-6. Disassembling the drive shaft  
Remove eight (8)  
screws to remove  
rear panel  
Bearings  
(2 total)  
Blower belt  
Blower motor  
Loosen four (4) screws to adjust mo-  
tor position and belt tension  
E. Blower Belt  
IV. MAINTENANCE - EVERY 6 MONTHS  
1. Remove the eight screws shown in Figure 4-7. Then,  
A. Check that the oven is cool and the power is disconnected,  
asdescribedinthewarningatthebeginningofthisSection.  
remove the rear panel from the oven.  
2. Check the blower belt for the proper 1/4(6mm) deflection  
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.  
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.  
C. For gas ovens, inspect and clean the burner nozzle and  
the spark electrode assembly.  
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.  
D. Check the conveyor drive shaft bushings and spacers.  
Replace the components if they are worn.  
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V. KEY SPARE PARTS – Available separately. See Figure 4-8.  
1
2
3
5
4
8
11, 12  
6
10  
9
7
19, 20, 21  
18  
17  
13, 14, 15, 16  
24  
23  
25  
22  
Figure 4-8. Key Spare Parts  
ITEM QTY.  
P/N  
DESCRIPTION  
1
2
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
2
1
1
60190  
58920  
58679  
60196  
59668  
57288  
33983  
51399  
97525  
60598  
44914  
44568  
60750  
60751  
60752  
60753  
60253  
60638  
60684  
58668  
58669  
59132  
M9608  
60452  
DIGITAL DISPLAY, PROGRAMMED  
CONVEYOR DRIVE MOTOR W/PICKUP ASSY.  
CONVEYOR SPEED CONTROLER  
KIT, THERMOCOUPLE 6″  
BELT, BLOWER  
3
4
5
6
MOTOR, BLOWER, 2HP  
HIGH LIMIT CONTROL MODULE, 240V  
COOLING FAN (BACKWALL)  
COOLING FAN (CONTROL COMPARTMENT)  
AIR SWITCH  
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
CONTROLLER, POWER 208V/240V  
CONTROLLER, POWER 380V/480V  
HEATER 208V 27.0 kW  
HEATER 240V 27.0 kW  
HEATER 380V 27.0 kW  
HEATER 480V 27.0 kW  
PHOTOCELL  
INVERTER, PROGRAMMED  
PLC  
THERMOCOUPLE MODULE  
CURRENT MODULE  
RELAY, DPDT 24V COIL  
POWER SUPPLY  
CONTACTOR, 24VDC  
25  
1
60636  
BEARING, PB 5/8 B  
P/N 60254 September 28, 2012  
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SECTION 5  
TROUBLESHOOTING  
PROBLEM:  
PROBLEM:  
OVEN BLOWER AND CONVEYOR OPERATE,  
YET THE OVEN IS NOT HEATING  
PRODUCTS ARE OVERCOOKED  
OR UNDERCOOKED  
Reset the temperature controller  
to a new setting (above 200°F),  
after turning the BLOWER switch  
to off for 30 seconds.  
Check for correct  
setting on tempera-  
ture controller.  
Check for correct  
setting of conveyor  
speed control.  
Turn temperature  
control to correct  
setting.  
Start the oven again. If the oven still does not  
heat, call your Middleby Marshall Service Agency.  
Set the conveyor speed  
control at correct setting.  
Verify the food prepa-  
PROBLEM:  
ration process.  
CONVEYOR WILL NOT HOLD PROPER SPEED  
OR WILL NOT RUN AT ALL  
If products still cook incorrectly,  
call your Middleby Marshall Ser-  
vice Agency.  
Check whether the conveyor is  
jammed on something in oven.  
PROBLEM:  
OVEN DOES NOT HEAT  
Check for proper tension of conveyor drive  
chain and conveyor belt. Refer to Section 4 for  
correct procedure.  
Check to see if both BLOWER  
switch and HEAT switch are in  
the “ON” or “I” position.  
Check that the conveyor  
drive sprocket is tight.  
If oven does not heat, call your  
Middleby Marshall Service Agency.  
If conveyor still does not run correctly, contact  
your Middleby Marshall Service Agency.  
PROBLEM:  
BLOWER MOTOR IS RUNNING, YET LITTLE  
OR NO AIR BLOWS FROM AIR FINGERS  
PROBLEM:  
OVEN DOES NOT TURN ON WHEN ITS  
SWITCHES ARE TURNED ON  
Air fingers reassembled incorrectly,  
Check that all electric supply switches are set to  
the “ON” or “I” position. Then, start the oven.  
after cleaning.  
Assemble air fingers correctly, after cleaning.  
Refer to Section 4 procedure, or call your  
Middleby Marshall Service Agency.  
If oven still will not start, contact your Middleby  
Marshall Service Agency.  
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SECTION 6 - WIRING DIAGRAM  
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NOTES  
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NOTES  
31  
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WARNING  
Improper installation, adjustment, alteration, service or maintenance  
can cause property damage, injury or death. Read the installation, op-  
erating and maintenance instructions thoroughly before  
installing or servicing this equipment.  
NOTICE  
During the warranty period, ALL parts replacement and servicing should be performed  
by your Middleby Marshall Authorized Service Agent. Service that is performed by par-  
ties other than your Middleby Marshall Authorized Service Agent may void your war-  
ranty.  
NOTICE  
Using any parts other than genuine Middleby Marshall factory manufactured parts re-  
lieves the manufacturer of all warranty and liability.  
NOTICE  
Middleby Marshall reserves the right to change 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  
P/N 625September 28, 2012  
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