PS740 Series
Electric
Domestic & Std. Export
ENGLISH
P/N 60254
November 18, 2008 Rev. B
PS740 Series Electric Ovens
Model:
• PS740E Electric
Combinations:
• Single Oven
• Double Oven (Two-Stack)
• Triple Oven (Three-Stack)
OWNER'S OPERATING AND
INSTALLATION MANUAL
for domestic and standard export ovens
©2007 Middleby Marshall Inc.
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • (847)741-3300 • FAX (847)741-4406
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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, providedthattermsofpaymenthavebeenfullymet. Alllabor
shallbeperformedduringregularworkinghours.Overtimepremium
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 MATE-
RIAL AND WORKMANSHIP FOR WHICH IT IS RESPON-
SIBLE. THE SELLER’S OBLIGATION UNDER THIS WAR-
RANTY SHALL BE LIMITED TO REPLACING OR REPAIR-
ING, AT SELLER’S OPTION, WITHOUT CHARGE, ANY
PART FOUND TO BE DEFECTIVE AND ANY LABOR AND
MATERIAL EXPENSE INCURRED BY SELLER IN REPAIR-
ING OR REPLACING SUCH PART. SUCH WARRANTY
SHALL BE LIMITED TO THE ORIGINAL PURCHASER
ONLY AND SHALL BE EFFECTIVE FOR A PERIOD OF
ONEYEAR FROM DATE OF ORIGINAL INSTALLATION, OR
18 MONTHS FROM DATE OF PURCHASE, WHICHEVER
IS EARLIER, PROVIDEDTHATTERMS OF PAYMENT HAVE
BEEN FULLY MET.
Thiswarrantyisnotvalidunlessequipmentisinstalled,started,
and demonstrated under the supervision of a factory-autho-
rized 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-autho-
rized installer.
Anyrepairsorreplacementsofdefectivepartsshallbeperformedby
Seller’s authorized service personnel. Seller shall not be respon-
sible 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
personnel. Authorized service agencies are located in prin-
cipal 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 particu-
lar 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 obligation
and Buyer’s sole and exclusive remedy for any action, in-
cluding 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
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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.
iv
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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.
E
D
J
I
G
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.
F
D. End Plugs: Allow access to the oven’s interior.
H
E. Eyebrows: Can be adjusted to various heights to prevent
A
heat loss into the environment.
F. Window: Allows the user to access food products inside
the baking chamber.
C
G. Machinery Compartment Access Panel: Allows access
to the oven’s interior and control components. No user
serviceable parts are located in the machinery compart-
ment.
B
H. Serial Plate: Provides specifications for the oven that
affect installation and operation. Refer to Section 2, Instal-
lation 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. Air Fingers: Project streams of hot air onto the food
product.
1
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I. OVEN SPECIFICATIONS
Table 1-1 Dimensions
Overall Height
Single Oven
Double Oven
Triple Oven
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)
32″ Conveyor 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)
24″ Conveyor 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
15 min.
Warmup Time
SERIES PS740 ELECTRICAL SPECIFICATIONS
Main Blower &
Elements Voltage
Control Circuit
Voltage
Phase
Frequency
Amperage
Draw
Poles
Wires
208-240V
3 Ph
50/60 Hz
100 Amp
3 Pole
4 Wire
(3 hot, 1 grd)
HEATER AMPERAGE
208-240V
Voltage
kW
Average Amps
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
5 Wire
(3 hot, 1neut, 1 grd)
380V
480V
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
5 Wire
(3 hot, 1neut, 1 grd)
Voltage
kW
Average Amps
N
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
2
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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
obstructions around or underneath the oven. Constructional changes to the area where the oven is
installed shall not affect the air supply to the oven.
CAUTION: To reduce the risk of fire, the appliance is to be mounted on floors of noncombustible construction with
noncombustible flooring and surface finish and with no combustible material against the underside thereof, or on
noncombustible slabs or arches having no combustible material against the underside thereof, such construction
shall in all cases extend not less than 12 inches (304mm) beyond the equipment on all sides.
CAUTION: For additional installation information, contact your local Authorized Service Agent.
NOTE– Theremustbeadequateclearancebetweentheovenandcombustibleconstruction. Clearancemustalso
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,
mustconformwithanyapplicablelocal, national, orinternationalcodes. Thesecodessupersedetherequirements
and guidelines provided in this manual.
NOTE: In the USA, the oven installation must conform to local codes. Electric ovens, when installed, must be
electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical
Code (NEC), or ANSI/NFPA70.
NOTE: In Canada, the oven installation must conform with local codes. Electric ovens, when installed, must be
electrically grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electrical
Code CSA C22.2.
3
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PS740 24″ OVEN INSTALLATION
REQUIRED KITS AND EQUIPMENT
PS740
Electric Oven
Installation
Kit
PS740
Single Oven
Option Base w/
15″ Legs,
Casters & Top
Kit
PS740
DoubleOven
OptionBase w/
6″ Legs,
Casters & Top
Kit
PS740
TripleOven
OptionBase w/
Casters& Top
Kit
TYPE OF INSTALLATION
P/N47810-0008
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 47810-0008
(Two required for double oven)
(Three required for triple oven)
ITEM
NO.
QTY
PART NO.
55028
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
4
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PS740 OVEN INSTALLATION
REQUIRED KITS AND EQUIPMENT
PS740
Electric Oven
Installation
Kit
PS740
Single Oven
Option Base w/
15″ Legs,
Casters & Top
Kit
PS740
DoubleOven
OptionBase w/
6″ Legs,
Casters & Top
Kit
PS740
TripleOven
OptionBase w/
Casters& Top
Kit
TYPE OF INSTALLATION
P/N47810-0008
P/N59720
P/N59725
P/N59726
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 47810-0008
(Two required for double oven)
(Three required for triple oven)
ITEM
NO.
QTY
PART NO.
55028
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 24″ Single Oven
Option Base with Legs and Top
1
8
HARDWARE BAG
5, 6, 7, 10 & 11
3
4
2
9
12
PARTS LIST FOR PS740 SERIES 24″ SINGLE OVEN OPTION - BASE w/15″ LEGS & TOP
P/N 61123
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
61126
COMPLETE BASE WELDMENT
2
3
4
2
37900-0024
22290-0009
22290-0010
2000531
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 1″ HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
61125
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
12
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
SUPPORT, SHELF
2
7A2S15
1
61128
6
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Figure 2-2B. Model PS740 32″ Single Oven
Option Base with Legs and Top
1
8
HARDWARE BAG
5, 6, 7, 10 & 11
3
4
2
9
12
PARTS LIST FOR PS740 32″ SERIES SINGLE OVEN OPTION - BASE w/15″ LEGS & TOP
P/N 59720
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
37900-0024
22290-0009
22290-0010
2000531
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 1″ HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
59560
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
12
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
SUPPORT, SHELF
2
7A2S15
1
59724
7
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Figure 2-3A. Model PS740 24 Double Oven
″
Option Base with Legs and Top
1
8
HARDWARE BAG
5, 6, 7, 10 & 11
3
4
2
9
12
PARTS LIST FOR PS740 SERIES 24″ DOUBLE OVEN OPTION - BASE w/6″ LEGS & TOP
P/N 61457
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
61126
COMPLETE BASE WELDMENT
2
3
4
2
37900-0102
22290-0009
22290-0010
2000531
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 1 HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
61125
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
12
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
SUPPORT, SHELF
2
7A2S15
1
61128
8
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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
3
4
2
9
12
PARTS LIST FOR PS740 SERIES 32″ DOUBLE OVEN OPTION - BASE w/6″ LEGS & TOP
P/N 59725
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
37900-0102
22290-0009
22290-0010
2000531
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 1 HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
59560
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
12
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
SUPPORT, SHELF
2
7A2S15
1
59724
9
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Figure 2-4A. Model PS740 24 Triple Oven
″
Option Base with Outriggers and Top
1
15
HARDWARE BAG
3
7, 8, 9, 10, 11, 12,
13, 14, & 17
5
4
6
2
16
PARTS LIST FOR PS740 SERIES 24″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP
P/N 61458
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
61126
COMPLETE BASE WELDMENT
2
3
4
2
45209
22290-0009
22290-0010
45206
QUAD OUTRIGGER WELDMENT
SWIVEL CASTER, W/BRAKE FLAT PLATE
SWIVEL CASTER, FLAT PLATE
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″
10
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Figure 2-4B. Model PS740 32 Triple Oven
″
Option Base with Outriggers and Top
1
15
HARDWARE BAG
3
7, 8, 9, 10, 11, 12,
13, 14, & 17
5
4
6
2
16
PARTS LIST FOR PS740 SERIES 32″ TRIPLE OVEN OPTION - BASE w/CASTERS & TOP
P/N 59726
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
45209
22290-0009
22290-0010
45206
QUAD OUTRIGGER WELDMENT
SWIVEL CASTER, W/BRAKE FLAT PLATE
SWIVEL CASTER, FLAT PLATE
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.
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
design. Consult the hood manufacturer or ventilation engineer
for these specifications.
equipment directly to the oven.
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 tempera-
ture-controlled for summer and winter. Return air can also be
brought in directly from outside the building, but detrimental
effectscanresultfromextremeseasonalhotandcoldtempera-
tures from the outdoors.
MOUNTING SUCH EQUIPMENT ON
THE OVEN MAY:
• 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.
A mechanically driven ventilation system is STRONGLY
RECOMMENDED for electric oven installations.
PROPER VENTILATION OF THE OVEN IS THE RESPONSI-
BILITY OF THE OWNER.
C. Other ventilation concerns
•
Special locations, conditions, or problems may require
the services of a ventilation engineer or specialist.
•
•
Inadequate ventilation can inhibit oven performance.
It is recommended that the ventilation system and duct
workbecheckedatprevailingintervalsasspecifiedbythe
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
12
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Figure 2-6. Leg extension and casters installation
IV. ASSEMBLY
A. Top Panel and Base Pad Assembly
Finished sides of
leg extension face
corner of base
pad
1. Install the four leg extensions onto the base pad using
the 3/8″-16 × 1″ screws, 3/8″ flat washers, and
3/8″ lockwashers supplied in the Base Pad Kit. See
Figure 2-6. Check that the finished sides of each leg
extension face OUTWARDS. One rear leg should be
attached using three 3/8″-16 × 1″ screws and the 3/4″
eyebolt, as shown in Figure 2-6. This eyebolt acts as the
anchor point for the restraint cable assembly (see Part C,
Restraint Cable Installation).
2. If your oven is equipped with the lower shelf, position it in
place as shown in Figure 2-6. Check that the lip on the
shelf faces DOWN. Seal joint between leg and shelf with
NSF listed silicone.
3. Install one caster onto each leg extension, as shown in
Figure 2-7. Use the 3/8″-16 × 1″ screws, 3/8″ flat wash-
ers, and 3/8″ lockwashers supplied in the Installation Kit.
The locking casters should be installed at the FRONT of
the oven. The non-locking casters should be installed at
the REAR of the oven.
Domestic and
standard export
ovens:
Lower
shelf
Locking casters -
FRONT of oven
4. Install the lower oven cavity onto the base pad.
See Fig 2-7.
Non-locking casters -
REAR of oven
5. For single ovens ONLY:
3/8″ flat
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.
washer
3/8″ lock
washer
For double or triple ovens:
3/8″-16 × 1″
hex screw
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.Oneendofthecableisanchoredtotheeyeboltontherear
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
PERSONEL.
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
the following:
#10-32 × 2-1/2″
screw length
Top
panel
#10-32 × 3/4″
screw length
• All four sides of the lower lip (on the bottom edge
oftheovencavity)overlapthetopoftheloweroven
• 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
14
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D. Conveyor Installation
Figure 2-13. Conveyor placement
1. UnfoldtheconveyorasshowninFigure2-12. 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. Continue moving the conveyor into the oven until the
frame protrudes equally from each end of the oven.
Check that the crumb tray supports located on the under-
side 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)
vertical
deflection
Adjustment
screws (2) on
idler end of
conveyor
Drive end (with
drive sprocket)
15
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5. If it is necessary to add or remove conveyor links to
achieve the correct tension, OR if it is necessary to
reverse the conveyor belt for correct orientation, the belt
will need to be removed from the conveyor frame. If this
is necessary, perform the following procedure:
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.
• Remove the conveyor assembly from the oven and
place 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
thereversedirection)andreinstallthemasterlinks.Replacethe
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
securingthephotoeyetothehousing.Rotatethephotoeye180
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. Installthecrumbtraysunderneaththeconveyorasshown
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
Apply power to the unit. Adjust the photo eye height by loosen-
ingthetwoscrewssecuringthephotoeyeassemblyandsliding
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
16
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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
and 480VAC. (These ovens have a 5-wire system.) A 2″
(51mm) diameter cutout/hole in the back of the machinery
compartment provides access for the electrical supply connec-
tions. Using flexible cable(s) for the electrical power supply
conductors requires a 2″ (51mm) strain-relief fitting (not fur-
nished) to enable 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
(copper)recommendedtoprovidethecurrentrequired;(referto
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-
ments of the appropriate statutory authority, such as the Na-
tional 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
requiretwo60-ampereserviceconnections, oneforeachoven;
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. Cop-
per 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
Electric 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 Ov e n
CAUTION
IT IS RECOMMENDED THAT THE OVEN
BE PLACED UNDER A VENTILATION
HOOD FOR ADEQUATE AIR SUPPLY
AND VENTILATION.
To Ov e n
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
ElectricalCode(currentedition)andmustbeincompliancewith
local codes.
Do NOT use conduit for ground.
NOTE:Theelectricalterminalconnectionmarked“MP”located
inside the control compartment is desiganated for the blue
(neutral) wire to the oven. See the electrical wiring/schematics
in Section 6 of this manual.
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.
18
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SECTION 3 - OPERATION
C. Temperature Control/Display
D. Message Bar
E. Energy Level
Indicators
E. Energy Level
Indicators
B. Conveyor Time Setting
A. Main On/Off Button
I. LOCATION AND DESCRIPTION OF CONTROLS
A. Main On/Off Button
C. Temperature Control/Display
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.
Displays the average set point of both right and left sides of the
oven. Pressing on the display allows individual temperature
displays and adjustments.
D. Message Bar
B. Conveyor Time Setting
Displays messages during oven operation.
E. Energy Level Indicators
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.
19
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II. NORMAL OPERATION - STEP-BY-STEP-
2. Left actual temperature - Indicates current average tem-
A. Daily Startup Procedure
perature of the left side of the oven.
1. Checkthatthecircuitbreaker/fuseddisconnectisintheOn
position. Check that the window is closed. The touch panel
display should be lit.
NOTE: Right to Left temperature settings should not exceed
a differential of 20 °F.
3. Right Set point temperature - Pressing on this value allows
the user to adjust the set point for the right side of the oven.
2. Adjust the conveyor to the desired bake time.
3. Press the temperature button to display right and left hand
oven settings. Set temperatures as desired.
4. Left Set point temperature - Pressing on this value allows
the user to adjust the set point for the left side of the oven.
4. PresstheONbuttontoactivatetheoven.Theconveyorwill
not run, until the oven temperature has reached the set
points.
5. Exit - Returns to the main screen.
B. Daily Shutdown Procedure
C. Energy Modes
1. Make certain there are no products left on the conveyor in
the oven.
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.
2. Press the ON square to turn the oven off.
3. Open the window to allow the oven to cool faster.
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
overitssetpoint, theovenswillcompletelyshutoff, allowingthe
oventocool.Themainblowerswillcontinuetorunat1500RPM
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.
4. After the oven has cooled and the blowers have turned off, the
circuit breaker/fused disconnect may be turned off.
Quick Reference – Touch Screen Controller
A. Main Screen
1. On/Off button - Used to turn oven On and Off.
2. Conveyor speed - Pressing on either the minutes or
seconds allows a new value to be input for the conveyor
speed. Split belt ovens have two inputs (front and rear
belts).
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
causenormaloperationoftheoventoresume,andbringtheset
point back to its original level. The belt will resume operation
once both sides of the over are within 5° F of the set point.
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.
Placing anything on the belt will NOT return the oven to
Operation.TheONbuttononthemainscreenhastobepressed
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.
20
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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.
Replace element.
Faulty heater element
•
Oven is operating, but
little or no air is coming
from the fingers.
Air fingers may be as-
sembled incorrectly after
cleaning.
•
Turn oven off, and allow to cool. Reassemble fingers cor-
rectly.
Conveyor will not move.
Conveyor may be jammed.
•
Turn oven off, and allow to cool. Check conveyor for block-
age.
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
Authorized Service Agent. It is also strongly recommended that the 3-Month Maintenance and 6-Month Maintenance
procedures in this section be performed ONLY by a Middleby Marshall Authorized Service Agent.
I. MAINTENANCE - DAILY
Figure 4-1. Cooling Vents and Grills
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
B. Clean ALL of the cooling fan grills and vent openings
with a stiff nylon brush. Refer to Figure 4-1 for the
locations of the grills and vents.
C. Clean the outside of the oven with a soft cloth and mild
detergent.
D. Check that ALL cooling fans are operating properly.
Vents on
front panel
of oven
CAUTION: If a cooling fan is not operating correctly, it must
bereplacedIMMEDIATELY. Operatingtheoven
without adequate cooling can seriously damage
the oven's internal components.
E. Clean the conveyor belts with a stiff nylon brush. This
is more easily accomplished by allowing the conveyor to
run while you stand at the exit end of the conveyor.
Then, brush the crumbs off the conveyor as it moves.
F. Remove and clean the crumb trays. If necessary, refer
to Figure 2-16 (in Section 2, Installation) when replacing
the crumb trays into the oven.
Fan grills (3) on rear
of oven and control
compartment
Vent (2) on rear
of machinery
compartment
G. Clean the window in place.
22
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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 Section.
B. Remove the crumb trays from the oven.
C. Lift the drive end of the conveyor slightly, and push it
forward into the oven. This removes the tension from the
drive chain. Then, remove the drive chain from the con-
veyor sprocket.
D. Slide the conveyor out of the oven, folding it as it is removed.
E. Remove the end plugs from the oven. The end plugs are
shown in Figure 1-1 (in Section 1, Description).
F. Slide the air fingers and blank plates out of the oven, as
shown in Figure 4-2. AS EACH FINGER OR PLATE IS
REMOVED, WRITE A “LOCATION CODE” ON IT WITH A
MARKER to make sure that it can be reinstalled correctly.
Example of markings:
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 EACH
FINGERISDISASSEMBLED,WRITETHE“LOCATIONCODE”
FOR THE FINGER ON ALL THREE OF ITS PIECES. This will
help you in correctly reassembling the air fingers.
CAUTION: Incorrectreassemblyoftheairfingerswillchange
the baking properties of the oven.
H. Clean the air finger components and the interior of the
baking chamber using a vacuum cleaner and a damp
cloth. Refer to the boxed warnings at the beginning of this
Section for cleaning precautions.
I. Reassemble the air fingers. Then, replace them in the
oven, using the “location guide” as a guide.
J. Replace the end plugs on the oven.
K. Reassemble the conveyor into the oven. If the drive
sprocket was removed when installing the conveyor,
replace it at this time.
L. Reattach the drive chain.
M. Check the tension of the conveyor belt as shown in Figure
2-14 (in Section 2, Installation). The belt should lift
between 3 - 4″ (75-100mm). DO NOT OVERTIGHTEN
THE CONVEYOR BELT. If necessary, the belt tension
can be adjusted by turning the conveyor adjustment
screws, located at the idler (right) end of the conveyor.
N. Replace the crumb trays.
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8. Reassemble the idler shaft into the conveyor. Make
sure that the bronze washer is in place between the
two sections of the shaft. See Figure 4-4.
III. MAINTENANCE – EVERY 3 MONTHS
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
9. Replacetheconveyoradjustmentscrewsasshownin
Figure4-4. Toallowtheconveyorbelttobereinstalled
later, do not tighten the screws at this time.
B. Vacuum both of the blower mounts, and their surrounding
compartments, using a shop vacuum.
10. Loosen the set screw on both of the conveyor drive
sprockets.Then,removethesprocketsfromtheshaft.
C. Tighten all electrical terminal screws.
D. Split Belt Disassembly and Cleaning
11. Check the conveyor configuration as follows:
1. Refer to Part D, Conveyor Installation, in the Installa-
tionsectionofthisManual.Then,removethefollowing
components from the oven:
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.
Withthescrewsremoved,lifttheendoftheshaftatthe
front of the oven, and pull the entire assembly free of
the conveyor frame.
• Conveyor end stop
• Crumb trays
• Chain cover
Standard conveyors are equipped with bronze bush-
ings mounted on spacers at both ends of the shaft, as
shown in Figure 4-5. For these convey-ors, remove
the two screws that hold the bracket to the conveyor
frame. With the screws removed, lift the end of the
shaft at the front of the oven, and pull the entire
assembly free of the conveyor frame. The brackets
will be removed along with the drive shaft assembly.
• Drive chains
• End plugs
• Conveyor assembly
2. Remove the master links from each conveyor belt.
Then, rollthebeltsupalongthelengthoftheconveyor
to remove them from the frame.
3. Remove the two conveyor adjustment screws from
the idler end of the conveyor frame, as shown in
Figure 4-4.
12. Disassemble and lubricate the two sections of the
drive shaft as described for the idler shaft, above.
13. Before reassembling the shafts into the conveyor
frame, check that they are oriented properly.
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. Cleantheshaftsthoroughlyusingarag.Then,lubri-cate
both the extended shaft and the interior of the hollow
shaft using a light food-grade lubricant. DO NOT
lubricate the shafts using WD40 or a similar product.
This can cause the shafts to wear rapidly.
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
frame, check that they are oriented properly.
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
tension by turning the conveyor adjustment screws.
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
motor position and belt tension
E. Blower Belt
IV. MAINTENANCE - EVERY 6 MONTHS
1. Remove the eight screws shown in Figure 4-7. Then,
remove the rear panel from the oven.
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
2. Check the blower belt for the proper 1/4″ (6mm) deflec-
tion at the center, and for cracking or excessive wear.
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.
See Figure 4-7. Overtightening the belt will cause premature
bearing failure and possible vibrations. A loose belt may also
cause vibrations.
3. If necessary, adjust the tension of the belt by loosening
the four motor mounting bolts. Reposition the motor as
neccessary until the correct 1/4″ (6mm) deflection is
reached, then tighten the bolts.
C. For gas ovens, inspect and clean the burner nozzle and
the spark electrode assembly.
D. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
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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
26
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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
preparation process.
PROBLEM:
CONVEYOR WILL NOT HOLD PROPER SPEED
OR WILL NOT RUN AT ALL
If products still cook incorrectly,
call your Middleby Marshall
Service 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,
after cleaning.
Check that all electric supply switches are set to
the “ON” or “I” position. Then, start the oven.
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.
27
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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,
operating and maintenance instructions thoroughly before
installing or servicing this equipment.
NOTICE
During the warranty period, ALL parts replacement and servicing should be performed
by your Middleby Marshall Authorized Service Agent. Service that is performed by
parties other than your Middleby Marshall Authorized Service Agent may void your
warranty.
NOTICE
Using any parts other than genuine Middleby Marshall factory manufactured parts
relieves the manufacturer of all warranty and liability.
NOTICE
Middleby Marshall reserves the right to change specifications at any time.
Middleby is proud to support the Commercial Food Equipment
Service Association (CFESA). We recognize and applaud
CFESA's ongoing efforts to improve the quality of technical
service in the industry.
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • USA • (847)741-3300 • FAX (847)741-4406
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