Middleby Marshall Oven P N 60250 User Manual

PS740 Series  
Gas  
Domestic & Std. Export  
ENGLISH  
P/N 60250  
September 28, 2012  
PS740 Series Gas Ovens  
Model:  
Combinations:  
Single Oven  
PS740G Gas  
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.  
© 2012 - 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 60250 September 28, 2012  
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TABLE OF CONTENTS  
Page  
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
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  
III. OVEN SPECIFICATIONS......................................... 2  
A. Dimensions.................................................... 2  
B. General Specifications .................................. 2  
C. Electrical Specifications for  
SECTION 5 – ELECTRICAL WIRING DIAGRAM ............ 28  
I. WIRING DIAGRAM, 740 GAS OVEN, 208/240V,  
50/60 Hz, 1 Ph........................................................ 28  
PS740 Gas Ovens......................................... 2  
D. Gas Orifice and Pressure Specifications  
for PS740 Gas 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 .......................................... 16  
Connection ....................................................... 17  
NOTE  
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  
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.  
P/N 60250 September 28, 2012  
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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. Gas Burner (gas ovens): Heat air, which is then projected  
to the air fingers by the blowers.  
L. Blowers:Projecthotairfromtheburnerorheatingelement  
to the air fingers.  
M. AirFingers:Projectstreamsofhotairontothefoodproduct.  
1
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I. OVEN SPECIFICATIONS  
Table 1-1 Dimensions  
Overall Height  
Single Oven  
Double Oven  
Triple Ove  
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)  
Conveyor Width – belt width is 32″  
33-1/2(838mm)  
or 2 × 15(381mm)  
33-1/2(838mm)  
or 2 × 15(381mm)  
33-1/2(838mm)  
or 2 × 15(381mm)  
Shortened Exit Conveyor - 24″  
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)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
1(25.4mm)  
Table 1-2: General Specifications PS740 GAS  
32Belt  
24Belt  
Weight  
1150 lbs. (522kg)  
99,000 BTU (25,000kcal, 29 kW/hr)  
600°F / 315°C  
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  
15 min.  
Two Blowers at 1900 RPM  
15 min.  
Warmup Time  
Table 1-3: Electrical specifications for PS740G gas ovens  
Main Blower  
Voltage  
Control Circuit  
Voltage  
Phase  
Freq  
Current  
Draw  
Poles  
Wires  
208-240VAC  
208-240VAC  
1Ph  
50/60Hz  
11-9.6 Amp  
2 Pole  
3 Wire (2 hot, 1 gd)  
Table 1-4: Gas orifice and pressure specifications for PS740G gas ovens  
Gas  
Main Orifice I.D.  
Supply (Inlet)  
Orifice (Manifold)  
Bypass  
Type  
PS740G  
Pressure  
Pressure  
Pressure  
Natural  
0.1065(0.120mm)  
8-12W.C. (19.9 - 29.9mbar)  
3.5W.C. (8.7mbar)  
0.25-0.3W.C. (0.6-0.8 mbar)  
Propane  
0.067(1.9mm)  
11-14W.C. (27.4 - 34.9mbar)  
10.0W.C. (24.9mbar)  
0.9-1.0W.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  
IT,PT,ES,SE,  
Main  
Orifice  
dia.  
UK,CH,IT,AT,  
DK,FI  
I2H  
SE,CH,AT,DK,  
FI,DE,NL  
I3B/P  
BE,IE,IT,PT,  
ES,UK  
I3+  
Orifice  
(Manifold)  
Pressure  
Rated  
Heat  
Input  
Gas  
Type  
NL  
I2L  
DE  
I2E  
BE,FR  
I2E+  
G20  
G25  
G30  
0.120″  
(3.05 mm)  
20  
mbar  
--  
20  
mbar  
20  
mbar  
--  
--  
--  
--  
11.21  
mbar  
22.36  
kW-hr.  
0.120″  
(3.05 mm)  
--  
--  
25  
mbar  
--  
--  
--  
--  
16.19  
mbar  
22.36  
kW-hr.  
0.075″  
(1.9 mm)  
--  
29 or 50  
mbar  
28-30, 37  
or 50 mbar  
26.2  
mbar  
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  
P/N 60250 September 28, 2012  
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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 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. 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
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PS740 24OVEN INSTALLATION  
REQUIRED KITS AND EQUIPMENT  
PS740  
Gas 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/N61452  
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 GAS OVEN  
INSTALLATION KIT  
P/N 61452  
(Two required for double oven)  
(Three required for triple oven)  
ITEM  
NO.  
QTY  
PART NO.  
22361-0001  
61823  
DESCRIPTION  
1
2
3
4
5
6
1
1
1
1
1
1
FLEXIBLE GAS HOSE  
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 Gas Oven Installation Parts  
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PS740 OVEN INSTALLATION  
REQUIRED KITS AND EQUIPMENT  
PS740  
Gas 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/N61033  
P/N67025  
P/N67026  
P/N66164  
PS740 Single Gas Oven  
PS740 Double Gas Oven  
PS740 Triple Gas Oven  
1
2
3
1
1
1
PARTS LIST FOR SERIES PS740 GAS OVEN  
INSTALLATION KIT  
P/N 61033  
(Two required for double oven)  
(Three required for triple oven)  
ITEM  
NO.  
QTY  
PART NO.  
22361-0001  
61823  
DESCRIPTION  
1
2
3
4
5
6
1
1
1
1
1
1
FLEXIBLE GAS HOSE  
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 Gas Oven Installation Parts  
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 SERIES 32SINGLE 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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B. Recommendations  
III. VENTILATION SYSTEM  
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. INAUSTRALIACOMPLIANCETOREGULATIONS  
AS5601/AG601 IS MANDATORY.  
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.  
equipment directly to the oven.  
MOUNTING SUCH EQUIPMENT ON  
THE OVEN MAY:  
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.  
• VOID AGENCY CERTIFICATIONS  
• RESTRICT SERVICE ACCESS  
• LEAD TO INCREASED SERVICE  
EXPENSES FOR THE OWNER  
A. Requirements  
NOTE: Return air from the mechanically driven system must  
not blow at the opening of the baking chamber. Poor  
oven baking performance will result.  
CAUTION: GasoveninstallationsREQUIREamechanically  
driven ventilation system with electrical exhaust  
air sensing control.  
C. Other ventilation concerns  
A mechanically driven ventilation system is STRONGLY  
RECOMMENDED for electric oven installations.  
Special locations, conditions, or problems may require the  
services of a ventilation engineer or specialist.  
PROPER VENTILATION OF THE OVEN IS THE RESPON-  
SIBILITY OF THE OWNER.  
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  
1/2lock  
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.  
1/2-13 × 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″  
screw length  
Top  
panel  
#10-32 × 3/4″  
screw length  
Assembled�  
base pad  
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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 without depending on the connector and the quick discon-  
nect 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.  
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  
Gas oven cavities be stacked BY AUTHORIZED PERSONEL.  
Contact your Middleby Marshall Authorized Service Agent for  
complete stacking instructions.  
Figure 2-10. Top panel installation  
1. Stack an oven cavity on top of the lower oven. Check  
the following:  
#10-32 × 2-1/2″  
screw length  
Top  
panel  
• All four sides of the lower lip (on the bottom edge of  
the oven cavity) overlap the top of the lower oven  
#10-32 × 3/4″  
screw length  
• 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)  
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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:  
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.  
• Removetheconveyorassemblyfromtheovenandplace  
it flat on the floor.  
RESETTING DIRECTION JUMPER  
• Remove the master links using long-nose pliers. Then,  
roll up the belt along the length of the conveyor frame.  
Locate Jumper P1 on the conveyor control board. Move jumper  
from terminals 1 and 2, and replace onto terminals 2 and 3.  
• Add or remove belt links as necessary to achieve the  
correct belt tension.  
CAUTION: Shock hazard in compartments electrical filters  
• Replace the belt on the conveyor frame. Check that the  
conveyorbeltlinksareorientedasshowninFigure2-15,  
and that the smooth side of the conveyor belt faces UP.  
are electrically alive.  
• Connect the inside master links. Check that the links  
are oriented as shown in Figure 2-15.  
SWITCHING PHOTO DETECTOR  
CAUTION: Disconnect Power Before Switching Photo eye.  
• 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.  
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.  
• Replace the conveyor into the oven.  
Figure 2-15. Conveyor and Master Link orientation  
Direction  
of travel  
CORRECT  
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.  
Incorrect  
master link  
position  
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.  
E. Final Assembly  
1. Install the crumb trays underneath the conveyor as shown  
in Figure 2-16.  
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.  
Figure 2-16. Crumb Trays  
Note: This is MUCH easier in reduced light.  
Replace all covers.  
VI. ELECTRICAL SUPPLY  
WARNING: Authorizedinstallationpersonnelnormallyac-  
complish 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.  
Crumb tray  
insertion  
NOTE: Theelectricsupplyinstallationmustsatisfytherequire-  
mentsoftheappropriatestatutoryauthoritysuchasthe  
National Electrical Code, CSA C22.2; the Australian  
Code AG601; or other applicable regulations.  
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.  
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  
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Figure 2-17. Utility Connection Locations for Gas Ovens  
Strain-relief  
fitting  
Gas Inlet  
(One per Single, Double,  
or Triple Oven)  
Electrical Junction Box  
(One per oven cavity)  
ontheovenserialplate.Thelocationoftheserialplateisshown  
in Figure 1-1 (in Section 1, Description).  
VII. GAS SUPPLY  
CAUTION: DURINGPRESSURETESTINGNOTEONEOF  
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 FOLLOWING:  
1. The oven and its individual shutoff valve must be discon-  
nected from the gas supply piping system during any  
pressure testing of that system at test pressure in excess  
of ½ psi (3.45 kPa).  
The supply conductors must be of the size and material (cop-  
per) 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).  
2. The oven must be isolated from the gas supply piping  
system by closing its individual manual shutoff valve dur-  
ing any pressure testing of the gas supply piping system  
at test pressure equal to or less than ½ psi (3.45 kPa).  
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 electri-  
cian supply the ground wire. Do NOT use the wiring conduit  
or other piping for ground connections.  
3. If incoming pressure is over 14W.C. (35mbar),  
aseparateregulatorMUSTbeinstalledinthelineBEFORE  
the individual shutoff valve for the oven.  
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.  
WARNING: To prevent damage to the control valve regu-  
lator during initial turn-on of gas, it is very  
important to open the manual shutoff valve  
very slowly.  
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.  
Connection  
Refer to the wiring diagram inside the machinery compart-  
ment of the oven to determine the correct connections for the  
electrical supply lines. Connect the supply as indicated on the  
wiring diagram.  
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.  
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.  
Gas Meter  
• One or two cavities: 750 cfh meter  
• Three oven cavities: 1200 cfh meter  
Gas Line  
• 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.  
17  
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B. Connection  
Figure 2-18. Flexible Gas Hose Installation  
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).  
1/2gas  
3/4-1/2″  
gas pipe  
reducer  
pipe nipple  
Check the serial plate to determine the type of gas (Propane  
or Natural) to be used with the oven.  
To Gas  
Supply  
Pipe  
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, compliancewiththeapplicable standards andregula-  
tions is mandatory.  
3/4gas  
pipe nipple  
1/2gas  
line tee with  
pressure tap  
90°  
Elbow  
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.  
Full-Flow  
Gas  
Shutoff  
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.  
Individual gas  
connection  
for each oven  
cavity  
Flexible  
Gas Hose  
Quick-  
disconnect  
device  
Certain safety code requirements exist for the installation of  
gas ovens; refer to the beginning of Section 2 for a list of the  
installationstandards.Inaddition,becausetheovenisequipped  
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.).  
Figure 2-19. Gas Burner Assembly  
Gas Burner  
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  
start-ups, 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:  
Manifold Pressure Tap  
1. Replace main orifices.  
3. Make sure that the appliance is in operation and the Mo-  
2. Adjust main gas regulator per instructions below.  
duplus® coil is energized with maximum current.  
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 con-  
nected). Replace the main orifices.  
4. If maximum rate pressure needs adjustment, use an 8  
mm wrench to turn adjustment screw for maximum pres-  
sure setting (clockwise to increase or counter-clockwise  
to decrease pressure), until the desired maximum outlet  
pressure is obtained.  
ReplacethemainorificesonthemanifoldassemblieswiththeLP  
units,andreplacethemanifoldassembly.Reconnecttheunion.  
5. Disconnect electrical connection of the Moduplus®.  
6. Check minimum pressure setting and readjust if neces-  
sary. (See Adjusting Minimum Pressure Setting for proper  
adjusting procedure.)  
E. Adjusting the Maximum Pressure Setting  
1. Disconnect pressure feedback connection (if applicable).  
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).  
7. Reconnect pressure feedback connection (if applicable).  
8. If minimum and maximum pressures are set, wire the  
Moduplus® in circuit.  
9. Close pressure tap screw.  
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F. Adjusting the Minimum Pressure Setting  
Figure 2-20. Burner Assembly  
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 a 5 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 com-  
ponents function correctly.  
NOTE: The installer MUST verify oven operation prior to put-  
ting oven into service.  
H. Maintenance  
It is recommended to check yearly the minimum and the maxi-  
mum setting and readjust them if necessary.  
Figure 2-21. Gas Valve  
Adjustment Screw (5 mm)  
for minimum pressure  
setting  
Adjustment Screw  
(8 mm) for maxi-  
mum  
pressure  
setting  
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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  
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  
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II. NORMAL OPERATION - STEP-BY-STEP-  
NOTE: Right to Left temperature settings should not exceed  
A. Daily Startup Procedure  
a differential of 20 °F.  
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.  
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  
2. Adjust the conveyor to the desired bake time.  
the user to adjust the set point for the left side of the oven.  
3. Press the temperature button to display right and left hand  
5. Exit - Returns to the main screen.  
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.  
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.  
B. Daily Shutdown Procedure  
1. Make certain there are no products left on the conveyor  
in the oven.  
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.  
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. 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-  
perature of the left side of the oven.  
21  
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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.  
No gas pressure  
Make sure main gas is on.  
Burner did not light  
Turn oven off, and restart. If it still does not light, call for  
service.  
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.  
Oven is not up to operating  
temperature.  
Allow oven to preheat.  
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  
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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.  
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:  
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.  
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.  
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 (2) on rear  
of oven and control  
compartment  
Vent (1) on rear  
of machinery  
compartment  
23  
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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  
19. Replace all components onto the oven.  
Figure 4-4. Disassembling the idler shaft  
Figure 4-5. Drive shaft configurations  
25  
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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. RemovethesixscrewsshowninFigure4-7.Then,remove  
A. Check that the oven is cool and the power is disconnected,  
asdescribedinthewarningatthebeginningofthisSection.  
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.  
P/N 60250 September 28, 2012  
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V. KEY SPARE PARTS – Available separately. See Figure 4-8.  
1
2
3
4
5
10  
16, 17, 18  
24  
22  
23  
19  
20  
21  
Figure 4-8. Key Spare Parts  
KEY SPARE PARTS PS740 GAS  
ITEM QTY.  
P/N  
DESCRIPTION  
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
60190  
58920  
58679  
60194  
M9608  
60196  
97525  
51399  
62044  
57288  
61602  
60679  
60671  
33983  
32108  
60684  
58668  
58669  
60250  
59132  
59668  
62288  
50240  
64106  
Digital Display, Programmed  
Motor, Conveyor Drive  
Conveyor Control Board  
Inverter, Programmed  
Power Supply  
3
4
5
6
Kit, Thermocouple  
Fan Cooling Control  
Fan Cooling Rear  
7
8
9
Air Switch  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
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  
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SECTION 5 - WIRING DIAGRAM  
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NOTES  
29  
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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  
050 September 28, 2012  
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