PS528-Series Electric Ovens: English
A MIDDLEBY COMPANY
owner's
operating
& installation
manual
PS528-Series OVENS
Model PS528E
PS528 (Single)
PS528 (Triple)
PS528 (Double)
Part No. 63934 Rev B
Price $30.00
©2009 Middleby Marshall Inc.
P: 08/09
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Model No.
Modéle No.
Serial No.
Serié No.
Installation Date
Date d'installation
MIDDLEBY MARSHALL
No Qu i b b l e li m i t e d Wa r r a N t y
(U.S.A. On l y )
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
MANUFACTURED BY IT TO BE FREE FROM DEFECTS
IN MATERIAL AND WORkMANSHIP FOR WHICH IT IS
RESPONSIBLE. THE SELLER’S OBLIGATION UNDER
THIS WARRANTY SHALL BE LIMITED TO REPLACING
OR REPAIRING, AT SELLER’S OPTION, WITHOUT
CHARGE, ANY PART FOUND TO BE DEFECTIVE AND
ANY LABOR AND MATERIAL EXPENSE INCURRED BY
SELLER IN REPAIRING OR REPLACING SUCH PART.
SUCH WARRANTY SHALLBE 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,
cleaning, 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
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 obligation
and Buyer’s sole and exclusive remedy for any action,
including breach of contract or negligence. In no event shall
Seller be liable for a sum in excess of the purchase price of
the item. Seller shall not be liable for any prospective or lost
profits of Buyer.
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
equipment 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.
© 2009 - 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
TABLE OF CONTENTS
(Continued)
Page
Page
SECTION 1
IV. NORMAL OPERATION - STEP-BY-STEP ...................... 20
A.Daily Startup Procedure............................................ 20
B. Daily Shutdown Procedure ..................................... 20
V. QUICK REFERENCE: TROUBLESHOOTING .............. 22
I. MODEL IDENTIFICATION ...............................................1
SERIES PS528 ELECTRICAL SPECIFICATIONS ..............2
II. COMPONENT FUNCTION .............................................4
A. Conveyor Motor and Conveyor Belt ........................4
B. Blower Fan .................................................................4
C. Electric Heaters .........................................................4
D. Cooling Fan ................................................................4
E. Air Fingers and Blank Plates - See Figure 1-9 ........4
SECTION 2
SECTION 4 MAINTENANCE
I. MAINTENANCE - DAILY............................................. 24
A. Exterior...................................................................... 24
B. Cooling Fan............................................................... 24
C. Conveyor Belt ........................................................ 24
D. Crumb Pans ............................................................ 24
II. MAINTENANCE - MONTHLY ....................................... 25
A. Removing Conveyor From Oven For Cleaning .... 25
B. Air Fingers Disassembly For Cleaning.................. 27
C. Reassembly of Air Fingers...................................... 28
D. Reinstall End Plugs ................................................. 31
E. Conveyor Reassembly Into Oven........................... 32
F. Checking Conveyor Belt Tension............................ 32
G. Conveyor Belt Link Removal.................................. 33
H. Attaching Drive Chain ............................................. 34
III. MAINTENANCE - EVERY 3 MONTHS ......................... 35
A. Electrical Terminals................................................. 35
B. Ventilation................................................................. 35
IV. MAINTENANCE - EVERY 6 MONTHS ......................... 35
PS528-SERIES ELECTRIC OVEN KEY SPARE
I. UNLOADING ....................................................................7
PS528 OVEN INSTALLATION
REQUIRED KITS AND EQUIPMENT ...........................8
PARTS LIST FOR SERIES PS528 ELECTRIC OVEN
INSTALLATION KIT......................................................8
UTILITY ROUGH-IN DIMENSIONS AND POSITIONING
FOR PS528-SERIES OVENS .....................................12
CIRCUIT BREAKER.......................................................12
ELECTRICAL SPECIFICATIONS...................................12
ELECTRICAL RATING...................................................12
SUPPLY WIRE................................................................12
SUGGESTED..................................................................12
II. VENTILATION GUIDELINES ........................................12
III. ELECTRICAL CONNECTION INFORMATION FOR
PS528-SERIES OVENS..............................................13
IV. ELECTRIC SUPPLY FOR ELECTRIC-HEATED
OVENS.......................................................................12
SECTION 3 INSTALLATION
PARTS ...................................................................... 36
KEY SPARE PARTS KIT................................................ 36
SECTION 5 TROUBLESHOOTING
I. CONTROL FUNCTIONS.................................................15
II. COMPONENT INFORMATION AND LOCATION .........16
A. Door Safety Switch ..................................................16
B. Blower Switch ..........................................................16
C. Heat Switch ..............................................................16
D. Temperature Controller............................................16
E. Conveyor .................................................................17
MEASURING CONVEYOR SPEED. ..............................17
III. STEP-BY-STEP OPERATION......................................18
A. Startup Procedures ..................................................18
Daily Startup..................................................................18
Power Failure.................................................................18
B. Shutdown Procedure ..............................................18
Troubleshooting Charts...................................................... 37
SECTION 6 - PARTS LIST
SINGLE OVEN EXPLODED VIEW .................................... 41
RELAY PANEL................................................................... 43
BLOWER ASSEMBLY ....................................................... 45
CONTROL PANEL ............................................................. 47
SINGLE CONVEYOR......................................................... 49
SECTION 7 ELECTRICAL SCHEMATICS
Wiring Diagram, E208-240V 50/60/1, PS528 ................... 51
Wiring Diagram, E208-240V 50/60/3, PS528 ................... 52
Wiring Diagram, E380-480V 50/60/3, PS528 ................... 53
Wiring Diagram, E380V 50/60/3, CE PS528..................... 54
NOTE
Wiring Diagrams are in Section 7 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
SECTION 1
DESCRIPTION
I. MODEL IDENTIFICATION
The Middleby Marshall PS528-Series may be
used either as a single oven or stacked for use
as double or triple ovens.
A single PS528-Series Oven (Figure 1-1) is
mounted on a base pad with legs. A double
oven(Figure1-2)consistsoftwo,stacked,single
ovens. A triple oven (Figure 1-3) consists of
three stacked single ovens. The lower oven is
mounted on a base pad.
Figure 1-1. Single PS528 Oven
On a double or triple oven, the ovens operate
independently. All ovens use identical controls
and components. One oven can be cleaned or
serviced, while the others are operating.
Figure 1-2. Double PS528 Oven
Figure 1-3. Triple PS528 Oven
1
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SECTION 1
DESCRIPTION
PS528 SERIES OVEN SPECIFICATIONS
Conveyor Belt Width
Heating Zone Length
Baking Area Square Feet
18.00" (457mm)
28.00" (711mm)
3.5 sq. ft. (0.33 sq. m.)
Overall Dimension
Standard Single Oven w/Legs
50.00" (1270mm) L ×
40.75" (1035mm) W ×
21.72" (786mm) H ×
Overall Dimension
Double Oven
50.00" (1270mm) L ×
40.75" (1035mm) W ×
37.27" (947mm) H x
Overall Dimension
Triple Oven
50.00" (1270mm) L x
40.75" (1035mm) W ×
52.82" (1342mm) H ×
Weight of Single Oven
Shipping Weight
250 lb (93.3kg)
325 lb (121.3kg)
22.1 ft3 (0.62 m3)
12 kW/hr (3 ph)/10kW/hr (1ph)
600°F (316°C)
Shipping Cube
Operating Range
Maximum Operating Temperature
Warm-up Time
20 min.
Belt Speed Limits
1-10 minutes
SERIES PS1828 ELECTRICAL SPECIFICATIONS
Main Blower &
Elements Voltage
Control Circuit Phase Frequency
Voltage
kW
Draw
Amperage
L2 L3
Poles
Wires
L1
N
208-240V
208-240
3 Ph
3 Ph
50/60 Hz
50/60 Hz
208 12
35.3 35.3 33.3
30.8 30.8 28.8
-
3 Pole
3 Pole
4 Wire
(3 hot, 1 grd)
240 12
-
4 Wire
(3 hot, 1 grd)
380V Export
480V
208-240V
208-240V
3 Ph
3 Ph
50/60 Hz
50/60 Hz
380 12
480 12
20.2 18.2 18.2 2.0
16.4 14.4 14.4 2.0
3 Pole
3 Pole
4 Wire
(3 hot, 1neut, 1 grd)
4 Wire
(3 hot, 1neut, 1 grd)
208-240V
208-240
1 Ph
1 Ph
50/60 Hz
50/60 Hz
208 10
230 9.2
48.1 48.1
40.0 40.0
2 Pole
2 Pole
3 Wire
(2 hot, 1 grd)
3 Wire
(2 hot, 1 grd)
3 Wire
1 Ph
50/60 Hz
240 10
41.7 41.7
2 Pole
(2 hot, 1 grd)
NOTE
Wiring Diagrams are contained in Section 7 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 1
DESCRIPTION
Figure 1-4. PS528-Series Oven Components Locations
3
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SECTION 1
DESCRIPTION
II. COMPONENT FUNCTION (Figure 1-4)
II. COMPONENT FUNCTION
A. Conveyor Motor and Conveyor Belt
The conveyor belt is driven by a variable-speed
electric motor (Figure 1-5) operating through a
gear reducer. The motor speed is controlled by
a digital control. The stainless-steel wire belt
can travel in either direction at variable rates
ranging from 3 minutes to 30 minutes; this is
the time that a product can take to pass through
the oven.
B. Blower Fan
The blower fans are located at the rear of the
oven. These blowers force heated air through
theairfingers.TheBLOWERswitchmustbeset
to “ON” or “I” for oven warmup and baking.
C. Electric Heaters
Blower Assembly
There is one heater element mounted on
the inside of the rear panel. The element is
connected to an electrical control which is
energized by the temperature controller.
D. Cooling Fan — See Figure 1-5 and Figure 1-6
The cooling fan is located in the back of the
oven. Thecoolingfandrawsairthroughitsgrille,
blowingitthroughtheblowermotorcompartment
and the control compartments into the oven top
and exhausted out the front louvers.
E. Air Fingers and Blank Plates - See Figure 1-7
E1. Air Fingers
An Air Finger Assembly is made up of three
parts:
1.OuterPlate-TheOuterPlateistheremovable
coveringwithtaperedholes, whichdirecttheair
stream onto the product being baked.
2. Inner Plate -The perforated Inner Plate
is vital in forming the unique air jets. It must
be assembled into the manifold with its holes
aligned with the holes of the outer plate.
3.Manifold-TheManifoldistheassemblywhich
slides on tracks into the oven plenum.
Right Control Box
Figure 1-5. Machinery Compartment
Components
4
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SECTION 1
DESCRIPTION
Figure 1-6. Cooling Fan
5
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SECTION 1
DESCRIPTION
F2. Blank Plates
1.BlankPlates-TheBlankPlatesareavailable
to install on the plenum where an air finger is
not required.
Figure 1-7. Blank Plates (two sizes) and an Air Finger.
6
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SECTION 2
INSTALLATION
SECTION 2
INSTALLATION
NOTE: The oven, when installed, must be electrically
I. UNLOADING
groundedinaccordancewithlocalcodes,orintheabsence
of local codes, with the National Electrical Code (NEC),
or ANSI/NFPA70.
Your Middleby Marshall PS528-Series Oven is shipped
partially assembled. It will arrive in a carton on a crate.
Thecrateandcartonmustbeexaminedbeforesigningthe
Bill of Lading. Report any visible damage to the transport
company, and check for the proper number of crates. If
apparent damage is found, make arrangements to file a
claim against the carrier. Surface Interstate Commerce
Regulations (U.S.A.) require that the claim must be
initiated by the consignee within 10 days from the date
that the shipment is received.
NOTE
There must be adequate clearance between
the oven and any adjacent combustible con-
struction. Clearance must also be provided
for servicing and for operation.
CAUTION
Itisrecommendedthattheovenbeplacedunder
a ventilation hood for adequate air supply and
ventilation.
CAUTION
Do not obstruct the flow of ventilation air to and
from your oven. Do not obstruct the fan holes in
the rear of the unit.
CAUTION
OnovenswiththeMachineryDriveCompartment
located at the right end, a minimum clearance of
0″ to a left side wall, 18″ to a right side wall and
6″ from a back wall to air openings at the rear
of the oven must be maintained.
For servicing and cleaning, a minimum of 18″
clearance from all walls is recommended.
7
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SECTION 2
INSTALLATION
PARTS LIST FOR SERIES PS528 ELECTRIC OVEN
INSTALLATION KIT
Single and Double Stack Ovens
P/N 63938
ITEM
NO.
1
2
3
4
QTY
PART NO.
3101908
62208
DESCRIPTION
LEG 4″ AD FT
INSULATION BOTTOM TRAY
BOTTOM TRAY WELDMENT
TOP COVER
4
1
1
1
62206
61650
5
6
7
4
1
4
51387
63934
62207
SCREW MSSLT THREAD 8-32 × 1/2, 18-8
OWNER'S OPERATING & INSTALLATION MANUAL
INSULATION
PARTS LIST FOR SERIES PS528 ELECTRIC OVEN
INSTALLATION KIT
Triple Stack Oven
P/N 63939
ITEM
NO.
1
QTY
2
PART NO.
62208
DESCRIPTION
INSULATION BOTTOM TRAY
2
3
1
1
62206
61650
BOTTOM TRAY WELDMENT
TOP COVER
4
5
6
7
4
4
1
4
51387
M3828
63934
62207
SCREW MSSLT THREAD 8-32 × 1/2, 18-8
PIN, ALIGNMENT
OWNER'S OPERATING & INSTALLATION MANUAL
INSULATION
Figure 2-1. PS528-Series Electric Oven Installation Parts
8
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SECTION 2
INSTALLATION
Figure 2-5. MODEL PS528 SINGLE OVEN DIMENSIONS
1
The Opening Height is Adjustable from 2-1/4 inch minimum
to 3-3/4 inch maximum in 1/2 inch increments.
1
9
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SECTION 2
INSTALLATION
Figure 2-6. MODEL PS528 DOUBLE OVEN DIMENSIONS
1
The Opening Height is Adjustable from 2-1/4 inch minimum
to 3-3/4 inch maximum in 1/2 inch increments.
1
10
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SECTION 2
INSTALLATION
Figure 2-7. MODEL 528 TRIPLE OVEN DIMENSIONS
1
The Opening Height is Adjustable from 2-1/4 inch minimum
to 3-3/4 inch maximum in 1/2 inch increments.
1
11
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SECTION 2
INSTALLATION
UTILITY ROUGH-IN DIMENSIONS AND POSITIONING
FOR PS528-SERIES OVENS
WARNING
DO NOT USE CONDUIT OR GAS LINE
FOR GROUND CONNECTION.
CAUTION
IT IS RECOMMENDED THAT THE OVEN
BE PLACED UNDER A VENTILATION
HOOD FOR ADEQUATE AIR SUPPLY
AND VENTILATION.
ELECTRIC SUPPLY TO BE
PROVIDED BY CUSTOMER
CIRCUIT BREAKER
Figure 2-9. Typical PS528-Series Oven(s)
Installation
Separate circuit breaker with lockout/tagout electrical
shutoff for each oven. Wire each oven separately.
60 Amp circuit breaker for 208-240V 1ph, 50 Amp circuit
breaker for 208-240V 3ph, or 30 Amp circuit breaker for
380-480V.
CAUTION
UNIT MUST HAVE AIR VENT PLATES
INSTALLED OR WARRANTY WILL BE VOID.
ELECTRICAL SPECIFICATIONS
Bl o w e r /
el e m e n t
208V
240V
380V
480V
280V
230V
240V
II. VENTILATION GUIDELINES
Ph a s e
3
3
3
3
1
1
1
Amechanicallydrivenventilationsystemisrecommendedfor
the PS528 Series Middleby Marshall conveyorized electric
ovens.
Cir C u it
kW
208/240 208/240 208/240 208/240 208/240 208/240 208/240
12
50/60
3
12
50/60
4
12
50/60
4
12
50/60
4
10
9.2
10
Local codes and conditions vary greatly from one area to
another and must be complied with. Following are the sug-
gested requirements for good ventilation. Please remember
these are recommendations or guidelines, you may have a
special condition or problem that will require the services of
a ventilation engineer or specialist. Proper ventilation is the
oven owner’s responsibility. Improper ventilation can inhibit
oven performance.
Fr e q u e n C y
Po l e s
wir e s
L1
50/60
50/60
50/60
2
2
2
4
5
5
5
3
48.1
48.1
-
3
40.0
40.0
-
2
41.7
41.7
-
35.3
35.3
33.3
-
30.8
30.8
28.8
-
20.2
18.2
18.2
2.0
16.4
14.4
14.4
2.0
L2
L3
Please Note: There are now two “stand off” ‘C’ Channels
that must be installed in the field (See Section 6: PARTS
LIST, page 44-45 for reference, Item 5).
N
-
-
-
SUPPLY WIRE
Supply wire size must be in accordance with the National
Electrical Code (current edition) and must be in compli-
ance with local codes.
SUGGESTED
If space permits, service should be located near the
control console end of the oven(s) to allow convenient
access to safety switches.
12
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SECTION 2
INSTALLATION
These ‘C’ Channel brackets are installed in the vertical
plane using existing screws (Item 6) to support these ‘C’
Channels using the upper and lower Key Hole openings in
the ‘C’ Channels. The ‘C’ Channels are identical and once
installed will allow ample amounts of air through the cooling
fan mounted on the rear side of the oven by keeping the
oven away from the rear wall.
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/circuitbreakerhavelockout/tagoutcapability.The
electricsupplyconnectionmustmeetallnationalandlocal
electricalcoderequirements.Copperistherecommended
material for the electrical supply conductors.
If you have any questions about how to mount these two
‘C’ Channel brackets, kindly phone Middleby Technical
Services at 847-741-3300. Press 3, then 5 for Technical
Support.
IV. ELECTRIC SUPPLY FOR
ELECTRICALLY HEATED OVENS
Power requirements for electrically heated ovens are
usually208-240VAC, 1-phase, 3-wire(2‘hot’, 1ground)
or 208-240VAC, 3-phase, 4-wire (3 ‘hot’, 1 ground),
although ovens built for export can have power require-
ments of 380VAC and 480VAC. (These ovens have a
4-wire system.) A 1.5″ (38mm) diameter cutout/hole in
the back of the machinery compartment provides ac-
cess for the electrical supply connections on 380V and
480V units. 208V and 240V 3-phase units have a cord
and plug. Using flexible cable(s) for the electrical power
supply conductors requires a 2″ (51mm) strain-relief fit-
ting (not furnished) to enable safe access to the terminal
block from which oven power is distributed.
III. ELECTRICAL CONNECTION INFORMATION
FOR PS528-SERIES OVENS.
WARNING
Authorized supplier personnel normally accom-
plish the connections for the ventilation system,
electric supply, as arranged by the customer.
Following these connections, the factory-autho-
rized installer can perform the initial startup of
the oven.
The supply conductors must be of the size and material
(copper) recommended to provide the current required;
(refer to the data plate for the ampere specifications).
The electric current rating for each conductor supplying
a PS528-Series Oven ranges from a minimum of 16.4
amperes to a maximum of 48.1 amperes.
Checktheovendataplate(Figure2-10)beforemakingany
electric supply connections. Electric supply connections
must agree with data on the oven data plate.
NOTE: The electric supply installation must satisfy the
requirements of the appropriate statutory authority, such
as the National Electrical Code (NEC), ANSI/NFPA70,
(U.S.A.); the Canadian Electrical Code, CSA C22.2; the
Australian Code AG601; or other applicable regulations.
Typical specifications for each PS528-Series Oven are
208Vor240V, 1-phase, 3-wire, 10kW;thisovenrequires
60-ampere service. A PS528-Series Double Oven
(Figure 1-2) installation would require two 60-ampere
serviceconnections, oneforeachoven;the10kWpower
consumption also doubles for such an installation to
20kW.
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.
Figure 2-10. Typical Electric Oven Data Plate
Figure 2-11. Junction Connection Box
13
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SECTION 2
INSTALLATION
NOTES
14
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SECTION 3
OPERATION
SECTION 3
OPERATION
I. CONTROL FUNCTIONS
Figure 3-1. PS528-Series Oven Control Functions
WARNING
A possibility of injury from rotating parts and
electric shock exists in this oven.
Never disassemble or clean the oven with the
BLOWER switch or any other oven control
turned “ON” or “I”. Turn “OFF” or “O” and lockout
or tagout all electric power to the oven before
attempting to clean or service this oven.
15
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SECTION 3
OPERATION
main blower will continue to run after the blower switch
is turned to the “OFF” or “O” position.
II. COMPONENT INFORMATION AND
LOCATION (Figures 3-1 and 3-2)
C. Heat Switch
A. Door Safety Switch
Turning the HEAT switch to “ON” or “I” will energize the
electric heating system. This switch is in series with the
blower fan motor and high temperature override switch.
Bothswitchesmustbeclosedbeforetheheatingelements
an be energized.
The Door Safety Switch is located at the lower right side
of control panel opening. Opening the control panel door
permits this switch to open, disconnecting power to all
electrical controls.
D. Temperature Controller
CAUTION
The temperature controller is a solid-state, PID type to
maintain the operator-set temperature. The temperature
controller continuously monitors the oven temperature
and turns on the modulating solid state relay controller.
Theheatisonforthetimerequiredtomaintainaconstant
oven temperature.
Do NOT touch the wires going to this safety
switch. Current is always present.
B. Blower Switch
The blower switch has two positions. The switch must be
“ON” or “I” for the main blowers to come on and permit
the oven to run. The fan circulates the air throughout
the oven and must stay on during baking and during the
cool down cycle above 200°F (93°C) to prevent blower
bearing damage. To protect the blower motor and bear-
ings a thermostatic override is built into the oven. If the
temperature inside the oven is over 180°F (82°C) the
The temperature controller contains a low-limit switch
which allows the oven to cool down to 200°F (93°C)
before shutting off the blower. A high-limit indication
(ALM 1) will appear on the display if the oven reaches
650°F (343°C).
Figure 3-2. Interior View of Control Console
16
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SECTION 3
OPERATION
E. Conveyor
The on-off switch for the conveyor motor is on the con-
trol panel. Also on the control panel is the digital con-
veyor speed control. The digital control can be adjusted
from 1-10 min. bake time (conveyor speed).
Refer to Figure 3-3.
Conveyor speed is measured by the amount of time it
takes for an item to go through the bake chamber of the
oven.
MEASURING CONVEYOR SPEED.
See Figures 3-4 and 3-5.
Figure 3-3. Conveyor Speed Digital Control
To check conveyor speed, place a product item at the
entrance end of baking chamber as shown. Time how
long it takes for the leading edge of the item to go from
the entrance end of the baking chamber to the exit end.
This should be the conveyor speed shown on the con-
veyor speed digital control.
NOTE: In Figures 3-4 and 3-5, the oven shown is with
the conveyor running right to left.
WARNING
Possibility of injury from rotating parts and
electrical shock exist in this oven.
Never disassemble or clean the oven with the
blower switch or any other part of the oven
turned “ON” or “I”. Turn “OFF” or “O” and lock-
out or tagout all electrical power to the oven
before attempting to clean or service
this oven.
Figure 3-4. Product at entrance end of baking
chamber – BEGINNING OF TIMING
Figure 3-5. Product at exit end of baking
chamber – END OF TIMING
17
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SECTION 3
OPERATION
4. Set the temperature controller to the desired baking
temperature.
WARNING
OVEN MUST BE KEPT CLEAR OF
COMBUSTIBLES AT ALL TIMES.
NOTE: For complete temperature controller operation
instructions refer to Step C.
5. Turn the HEAT switch (Figure 3-6) to the “ON” or “I”
position. This completes a circuit to supply electric power
to the electric heating system.
III. STEP-BY-STEP OPERATION
A. Startup Procedures
Daily Startup
6. Ovenwillreachabakingtemperatureof500°F(232°C)
in approximately 20 minutes. Allow the oven to cycle for
30minutesafterithasreacheddesiredbaketemperature.
The oven is now ready for baking.
1. TurntheBLOWERswitch(Figure3-6)tothe“ON”or“I”
position. This starts the main blower fan and the cooling
fans. The blower circulates air through the air fingers and
must stay on during the cooking or baking process.
Power Failure
In case of power failure, turn off all switches and remove
product. After power has been reestablished follow
normal startup procedure.
2. Check to see if the cooling fans (see Figure 1-8) are
operatingwhentheblowerswitch(seeFigure3-6)isturned
“ON” or “I”. The cooling fans cool the control components
and blower motor. The cooling fans, located at the rear
of the oven blows air into and through the cabinet. Air is
exhausted through the front of the cabinet and also out
the front of the oven. Refer to Daily Maintenance Section
for fan intake checking procedure.
B. Shutdown Procedure
1. Turn the BLOWER and HEAT switches to “OFF” or
“O”.
NOTE: The blowers will remain on until the oven tem-
perature cools down to 200°F (93°C) at which time they
will stop automatically.
IMPORTANT NOTE
The cooling fan operates when the BLOWER
switch is turned “ON” or “I”. It must operate to
keep the control console below 140°F (60°C).
2. Make certain that there are no products left on the
conveyor inside the oven. Turn the CONVEYOR switch
to “OFF” or “O”.
3. TurntheCONVEYORswitch(Figure3-6)tothe“ON”or
“I” position. This starts the conveyor belt moving through
the oven. Set the conveyor speed for the desired baking
time. Refer to the following Procedures E, F and G.
18
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SECTION 3
OPERATION
Figure 3-6. Control Panel
19
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SECTION 3
OPERATION
7. Wait for the oven to heat to the setpoint temperature.
Higher setpoint temperatures will require a longer wait.
The oven can reach a temperature of 500°F (232°C) in
approximately 15 minutes.
IV. NORMAL OPERATION - STEP-BY-STEP
A.Daily Startup Procedure
1. Check that the circuit breaker/fused disconnect is in the
on position.
8. (Optional)PresstheTem-
2. Turn the "BLOWER"
perature ( ) key to show
the Actual Temperature
in the display, and wait
(
) switch to the
wait
“ON” ("I") position.
for
for the "ACTUAL TEMP"
lighttoturnon. Thisallows
you to monitor the oven
temperature as it rises to
the setpoint.
3. Turnthe"CONVEYOR"
(
)switchtothe“ON”
("I") position.
9. Allowtheoventopreheatfor10minutesafterithasreached
the set point temperature.
B. DAILY SHUTDOWN PROCEDURE
4. If necessary, adjust the
conveyor speed setting
1. Turnthe"HEAT"( )and
by pressing the
or
+
or
pushbuttons on the
conveyorspeedcontroller
to change the displayed
bake time.
"BLOWER"( )switches
to the "OFF" ("O") posi-
tion. Notethattheblowers
will remain in operation
until the oven has cooled
to below 200°F (93°C).
5. Adjust the temperature
controller to a desired
settemperature, ifneces-
sary.
wait
for
+
2. Make certain that there
arenoproductsleftonthe
conveyorinsidetheoven.
Turn the "CONVEYOR" (
) switch to the "OFF"
•
Press the Set Point
and Unlock keys at
the same time. Wait
for the "SET PT" light
to turn on.
("O") position.
•
Press the Up Arrow
and Down Arrow
Keysasnecessaryto
adjust the set-point.
3. After the oven has cooled and the blowers have turned to
the “OFF” or “O” position, switch the circuit breaker/fuse
disconnect to the “OFF” or “O” position.
or
6. Turn the "HEAT" (
)
switch to the "ON" ("I")
position, and wait for the
"HEAT ON" light to turn
on.
CAUTION
In case of power failure, turn all switches to the “OFF”
("O")positionandremovetheproduct. Afterthepower
has been restored, perform the normal startup pro-
cedure. IF THE OVEN WAS SWITCHED OFF FOR
LESSTHAN5MINUTES,WAITFORATLEASTFIVE
MINUTES BEFORE RESTARTING THE OVEN.
wait
for
20
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SECTION 3
OPERATION
Display
"HEAT ON" Light
Lights when the
burner is in
Shows the Set Point
or the Actual Tem-
perature in degrees
Fahrenheit (F) or
Celsius (C).
operation.
"SP LOCK"
Light
Lights when the set
point is locked out
from changes. This
setting can only be
changed by service
personnel.
"SET PT" (set-
point) Light
Lights when the set
point is shown in
the display.
OVERTEMP
Light
Lights when the oven
temperature is greater
than 650°F (343°C).
Refer to Quick Refer-
ence: Troubleshoot-
ing in this section.
"ACTUAL TEMP"
Light
Lights when the Actual
Temperature is shown
in the display.
Service Key
Service use
only.
Temperature Key
Press this key once
to view the Actual
Temperature in the
Display.
Set Point Key
Press this key togeth-
er with the Unlock Key
to allow the Set Point
to be changed.
Changes can only be
made for 60 seconds.
Unlock Key
Press this key togeth-
er with the Set Point
Key to allow the Set
Point to be changed.
Changes can only be
made for 60 seconds.
Up Arrow and Down
Arrow Keys
Press these keys to adjust
the Set Point up or down.
If the Set Point will not
change, refer to Set Point
Key and Unlock Key in this
section.
21
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SECTION 3
OPERATION
V. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM
PROBLEM
SOLUTION
The oven temperature ex-
ceeded 650°F (343°C), and
theburnerwasautomatically
shut down.
•
Follow the procedures under Daily Shutdown Procedures in this
section to shut down the oven. Contact your Middleby Marshall
Authorized Service Agent to determine and correct the cause of
the condition to prevent damage to the oven.
light is lit, food product is
undercooked
Electrical power may not
be reaching the oven, or
the controls may be set
incorrectly.
Oven will not
turn on at all
•
•
Check that the circuit breaker/fused disconnect is turned on.
Check that the "BLOWER" ( ) Switch is in the “ON” ("I")
position.
The oven did not reach
200°F (93°C) within 15 min-
utesofstartup,andtheoven
has stopped heating.
•
•
•
Turn the "HEAT" ( ), "BLOWER" ( ), and "CONVEYOR"
(
)switches to the "OFF" ("O") position.
Wait for AT LEAST FIVE MINUTES before restarting the
oven.
appears in display,
oven is not heating
Repeat the Daily Startup procedure.
•
•
Check that the Set Point is correctly set.
Controls may be set incor-
rectly.
Oven will not heat
Check that both the "BLOWER" ( ) and "HEAT" ( ) Switches
are in the “ON” ("I") position.
•
If the oven still will not heat,turn the "HEAT" ( ), "BLOWER"
(
), and "CONVEYOR" (
)switches to the "OFF" ("O")
position.
•
•
Wait for AT LEAST FIVE MINUTES before restarting the
oven.
Repeat the Daily Startup procedure. Check that the Set Point
is above 200°F (93°C).
Oven is operating, but little
or no air is blowing from air
fingers
Air fingers may have been
reassembled incorrectly
after cleaning.
•
•
Turn the oven to the “OFF” or “O” position, and allow it to cool.
Disconnect electrical power to the oven.
RefertoSection4,Maintenance,forinstructionsonreassembling
the air fingers.
Conveyor moves with a
jerky motion, or will not
move at all
Conveyor may be jammed
on an object in the oven, or
conveyor belt or drive chain
tension may be incorrect.
•
Turn the oven to the “OFF” or “O” position, and allow it to cool.
Disconnect electrical power to the oven.
•
•
Check if the conveyor is blocked by an object inside the oven.
Refer to Section 4, Maintenance, for instructions on checking
the conveyor and drive chain tension.
Food products are over-
cooked or undercooked.
Controls may be set
incorrectly.
•
Check that the set temperature and bake time settings are
correct.
IF THESE STEPS FAIL TO RESOLVE THE PROBLEM, CONTACT YOUR LOCAL MIDDLEBY MARSHALL
AUTHORIZED SERVICE AGENT. A SERVICE AGENCY DIRECTORY IS SUPPLIED WITH YOUR OVEN.
22
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SECTION 4
MAINTENANCE
SECTION 4
MAINTENANCE
WARNING
Possibility of injury from rotating parts and electrical
shock exist in this oven. Turn off and lockout or tagout
electrical supply to oven(s) before attempting to disas-
semble, clean or service oven(s). Never disassemble
or clean the oven with the blower switch or any other
part of the oven turned on.
WARNING
Before performing any maintenance work or cleaning,
turn main power switch off.
CAUTION
When cleaning do not use any abrasive cleaning
materials or water spray, wipe clean only. Never use a
water hose or pressurized steam cleaning equipment
when cleaning this oven.
NOTICE
If the oven is to be removed from its installed location
for servicing, 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 main circuit breakers and disconnect con-
nector from oven.
3. Move oven to desired location for servicing.
4. When servicing is complete, move oven to original
location.
5. Adjust legs to level oven.
6. Connect electrical connectors to oven.
7. Turn on main circuit breakers.
8. Follow normal startup instructions.
23
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SECTION 4
MAINTENANCE
D. Crumb Pans (Figure 4-2)
I. MAINTENANCE - DAILY
A. Exterior
WARNING
Everyday you should clean the outside of the oven with
a soft cloth and mild detergent.
Crumb pan is extremely hot while oven
is operating. Allow oven to cool before
removing crumb pan.
WARNING
Never use a water hose or pressurized steam
cleaning equipment when cleaning the oven.
Whentheoveniscoolremoveandcleanthecrumbpanat
each end of the oven. Each crumb pan can be removed
by sliding it out, as shown in Figure 4-2. Reinstall the
crumb pans after cleaning.
B. Cooling Fan
1. ONECOOLINGFANGRILLEATTHEREAROFTHE
OVEN MUST BE CLEANED DAILY - Clean grille with a
stiff nylon type brush.
Cooling Fan Grille
2. Check the air intake of the cooling fan daily. The best
time to check is right after starting the oven.
IMPORTANT NOTE
Thecoolingfanoperateswhentheblowerswitch
is turned to “ON” (“I”). It must operate to keep the
electrical control cabinet below 140°F (60°C).
WARNING
Figure 4-1. Oven Cooling Fans
IF FAN BLADE IS NOT ROTATING, BROKEN,
OR FAN ASSEMBLY IS MISSING FROM MAIN
BLOWERMOTORSHAFT,DONOTOPERATE
OVEN. REPLACE COOLING FAN BLADE
BEFOREOPERATINGOVEN.Seriousdamage
could be done to the burner blower motor and/
or solid-state electrical components if oven is
operated while cooling fan is not running or vent
grille is plugged.
3. Using a stiff nylon brush clean control compartment
vent grille.
C. Conveyor Belt (Figure 4-2)
Everyday, just after starting the oven, stand at the un-
loading end of the conveyor, and with a brush, remove
foodparticles(crumbs, etc.)clingingtotheconveyorbelt,
brushing them into the crumb pan.
Figure 4-2. Conveyor Belt and
Crumb Pan Cleaning
24
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SECTION 4
MAINTENANCE
the aluminized finger manifold surfaces.
II. MAINTENANCE - MONTHLY
You can order non-caustic cleaner from your local autho-
rizedMiddlebyMarshallPartsDistributorinthequantities
listed below:
NOTE: The oven interior may require cleaning more
than once a month depending on the volume of bak-
ing. To clean the interior, you have to disassemble
some parts of the oven.
Part #
Quantity
When cleaning your Series PS528 Oven note the
following:
27170-0244
27170-0246
Case of Quarts (6)
Case of Gallons (4)
PRECAUTIONS-
A. Removing Conveyor From Oven For Cleaning
1. Do not use excessive water or saturation of oven
insulation will occur.
1. Remove entry and exit trays.
2. Loosen (do not remove) two screws on housing
guard.
2. Do not use a caustic oven cleaner or the aluminized
finger manifold surfaces will be severely damaged.
3. Remove motor housing guard.
4. Lift conveyor and remove chain.
When cleaning your oven, first remove all heavy debris
with a vacuum cleaner. Use a damp cloth for light clean-
ing. For heavier cleaning of baked on grease and carbon
deposits use a non-caustic cleaner that will not react with
Figure 4-3.
25
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SECTION 4
MAINTENANCE
5. Lift other side of conveyor and push toward other
side.
6. Remove conveyor as shown.
Figure 4-6.
Figure 4-4.
Figure 4-5.
Figure 4-7.
CAUTION
Be careful not to bump the drive sprocket
while handling the conveyor, to avoid
damaging the drive shaft.
B. Air Fingers Disassembly For Cleaning
26
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SECTION 4
MAINTENANCE
1. As the air fingers are removed use a felt pen to mark
all parts of the fingers. This includes the finger manifold,
inner plate and the outer plate (refer to Figure 1-9). If a
blankorchokeplateisused,markthatplatealso.Fingers
are marked in the order shown; as viewed from the front
of the oven. (The marks for an upper oven should be
preceded with a “U”, example UB1, UT2, etc.)
Standard Fingers
T1
B1
T2
B2
T3
B3
2. Slide blank plates straight out.
Figure 4-9.
4. With air fingers out, place them in an upright position
to remove the outer plate.
5. Gently step on the lip of the finger and pull the outer
plate off.
Figure 4-8.
3. Remove air fingers.
NOTE:Someovenusersrequireacustomfingerarrange-
ment where the quantity of air fingers may vary.
You can remove top and bottom fingers and blank
plates from each or either end. It is highly recommended
that each finger be marked before removing so it is
placed in exactly the same position when reassembled
(refer to step 1).
Remove the air fingers, pull the finger at the back side
- pull straight out.
Figure 4-10.
27
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SECTION 4
MAINTENANCE
6. To remove the inner plate, pull the plate out and then up.
C. Reassembly of Air Fingers
1. Air fingers are made up of one inner plate, one outer
plate and the finger housing manifold. Be sure to match
up the markings (T1, T2, T3, etc.) on all the parts of the
air fingers as you are reassembling.
Figure 4-11.
7. The outer finger plate is stainless and may be cleaned
by either soaking in a hot, strong detergent solution or
using a caustic cleaner. The conveyor belt can also be
cleaned in the same way.
Figure 4-14.
2. Reassemble the inner plate. Keep your fingers clear
so you won’t pinch them. The inner plate of a finger will
only go in one way because of its design.
3. Replace the outer plate by placing your hands flat on
the top of the plate and pushing down. Keep your fingers
clear so you won’t pinch them.
Figure 4-12. Standard Lower Finger
Figure 4-15.
Figure 4-13. Standard Upper Finger
28
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SECTION 4
MAINTENANCE
4. Replace the air fingers by pushing in at the back side.
Remember to replace them according to the numbers
marked on them when they were removed. They must
go back in the same way they came out.
IMPORTANT: When inserting fingers the tab on
the outer plate must be in the groove as shown
in Figure 4-18. There is a blocking tab on the
outsideofthegroovewhichwillpreventinserting
thefingerinthegrooveiftheouterplateismoved
away from the flange of the finger manifold.
Figure 4-16.
Extended Lip
Tab on
Outer Plate
Flange of
Finger Manifold
Tab on
Outer Plate
Figure 4-17.
29
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SECTION 4
MAINTENANCE
5. Install fingers and blank plates correctly with edges
interlocked and no space between edges.
Incorrect - Too
Much Space
Top Finger
Blank Plate
Tab on Outer Plate of Finger
Located in Groove
Incorrect - Too
Much Space
Top Finger
Blank Plate
Tab on Outer Plate of Finger
Located in Groove
Correct - Edges
Overlap Com-
pletely
Top Finger
Blank Plate
Tab on Outer Plate of Finger
Located in Groove
Figure 4-18.
30
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SECTION 4
MAINTENANCE
D. Reinstall End Plugs
1. Reinstall lower end plug. Be sure to tighten the wing
screw on the end plug.
2. Reinstall conveyor.
3. Reinstall upper end plug. Be sure to tighten two wing
screws on the end plug.
Figure 4-19.
Figure 4-20.
31
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SECTION 4
MAINTENANCE
E. Conveyor Reassembly Into Oven
F. Checking Conveyor Belt Tension
1. Lift conveyor and position it in oven as shown.
WARNING
NOTE:Conveyormaybeinsertedintoeitherendofoven.
If it is to be installed from the non-drive end of the oven
the drive sprocket assembly must be removed as shown
in conveyor disassembly section.
Ovenconveyorbeltmustbecoolwhenadjusting
belt. Do not adjust belt if HOT.
1. With the conveyor assembly in the oven, stand at one
endofconveyorandchecktensionbyliftingtheconveyor
belt at the center of the oven chamber opening. The belt
should not lift higher that 1″ to 2″ (75mm to 102mm).
2. If conveyor belt is still not under proper tension, an
entirelinkmustberemoved. Usethefollowingprocedure
“H. Conveyor Belt Link Removal” to remove a link. If
conveyor belt is under proper tension proceed directly
to “J. Attaching Drive Chain”.
Figure 4-21.
2. Reinstall the conveyor extension.
Conveyor Extension
Figure 4-23.
Figure 4-22.
32
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SECTION 4
MAINTENANCE
G. Conveyor Belt Link Removal
4. Unhook the link to be removed.
1. Using long nose pliers, an entire link can be removed
with the conveyor assembly either in or out of the oven.
Position master links at end of conveyor as shown in
Figure 4-24.
5. Pull up on the belt link section and remove. Do not
discard the link removed as it may be used for making
spare master links.
NOTE: If a section of the conveyor belt is being replaced
it should be done now. Remove the links that need re-
placing and use the section of conveyor belt furnished
in your installation kit to replace them.
Master Links
Figure 4-24.
2. Using long nose pliers, unhook master links at left
end of conveyor as shown in Figure 4-25.
Figure 4-27.
NOTE: Before connecting the inside master links, notice
thattheselinkshaveacorrectposition(Figure4-28). The
link at the right is in the correct (horns up) position for
inserting into the conveyor belt. The horns facing down
Correct
Position
Incorrect
Position
Figure 4-25.
3. Remove the outside master links on the right and left
sides of the conveyor belt as shown in Figure 4-26.
are in the incorrect position.
Figure 4-28.
Figure 4-26.
33
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SECTION 4
MAINTENANCE
6. Reconnect the inside master links (Figure 4-29.)
H. Attaching Drive Chain
1. If drive sprocket assembly was removed reassemble
it into the conveyor drive shaft. Be sure flat on end of
drive shaft aligns with set screw in conveyor shaft collar.
Once in place tighten 3/32″ set screw.
2. Lift conveyor and install drive chain to conveyor drive
sprocket and motor sprocket.
Figure 4-29.
NOTE: The outside master links have right and left sides
to them. The right edge master link has an open hook
facing you as shown in Figure 4-30. This will match up
with the outer edges of the conveyor belt. Remember
this hook travels backwards on the conveyor.
Direction of travel
Figure 4-32.
3. The angle plate located on the underside of the con-
veyor must be against the lower end plug. This is true
on both sides of oven.
Figure 4-30.
7. Reconnect the outside master links.
8. Replace all parts removed from the oven.
Crumb Pan
Mounting
Bracket
Lower End Plug
Figure 4-33.
Figure 4-31.
34
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SECTION 4
MAINTENANCE
4. Reattach conveyor guard to control panel and secure
two screws.
A. Electrical Terminals
Open the control cabinet door by removing the three
screwsfromthecontrolcabinetdoor.Tightenallelectrical
control terminal screws including the electrical contactor
terminal screws as shown in Figure 4-35.
Install both upper end plugs.
Figure 4-34.
Figure 4-35.
B. Ventilation
III. MAINTENANCE - EVERY 3 MONTHS
Check that the air circulation throughout the oven is not
blocked and is working properly.
WARNING
Shut OFF all electrical power and lock/tag out
the switch before attempting maintenance work.
IV. MAINTENANCE - EVERY 6 MONTHS
A. Check brushes on D.C. conveyor motor, when worn
to less than 1/10″ (2.4mm), replace the brushes.
NOTE:Itisrecommendedthatthe3-monthmaintenance
be performed by an authorized Middleby Marshall
technician.
B. Check your oven venting system.
IMPORTANT NOTICES:
• Installation of replacement parts requiring access
to the interior of the oven is permitted only by an
authorized service technician.
• If there are any problems with the operation of
the oven, the authorized service technician must
be called.
• It is suggested to obtain a service contract with a
manufacturer’s authorized service technician.
35
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SECTION 4
MAINTENANCE
KEY SPARE PARTS KIT
An oven can be purchased with a Key Spare Parts Kit
(Figure 4-36). (The kit can be purchased when the oven
is ordered, or later, from a Middleby Marshall Authorized
Parts Distributor). The kit contains many of the crucial
parts that can reduce serious downtime and loss of pro-
duction, if a failure occurs.
Replacementpartsforthiskitcanbepurchasedfromyour
Middleby Marshall Authorized Parts Distributor.
PS528-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT (Figure 4-36)
ITEM
PART NO.
47321
44914
44658
58500
60542
33812-5
63932
61747
63933
63929
63930
63931
57408
ENGLISH DESCRIPTION
Kit, Temperature Control On/Off Pid
Controller, 208-240V
QUANTITY
1
2
2
3
4
5
6
6
6
6
6
6
7
1
1
1
1
1
1
1
1
1
1
1
1
1
Controller, 380-480V
Conveyor Drive Motor and Magnet
Conveyor Speed Control
Thermocouple*
Heater Element, 208V 10kW
Heater Element, 208V 12kW
Heater Element, 240V 10kW
Heater Element, 240V 12kW
Heater Element, 380V 12kW
Heater Element, 480V 12kW
Contactor
* The proper location for the thermocouple is as follows: 1) Temperature sensing
is located on the entrance end of the unit on the bottom, 2) High limit is located on
the exit end of the unit on the top, 3) High limit on the PS528 is 600 degree's.
1
2
4
3
5
7
6
Figure 4-36.
36
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SECTION 5
TROUBLESHOOTING
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,
Check that all electric supply switches are set to
the “ON” or “I” position. Then, start the oven.
after cleaning.
Assemble air fingers correctly, after cleaning.
Refer to Section 4 procedure, or call your
Middleby Marshall Service Agency.
If oven still will not start, contact your Middleby
Marshall Service Agency.
37
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SECTION 5
TROUBLESHOOTING
NOTES
38
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SECTION 6
PARTS LIST
SECTION 6 - PARTS LIST
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SECTION 6
PARTS LIST
40
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
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SECTION 6
PARTS LIST
49
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SECTION 6
PARTS LIST
NOTES
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SECTION 7
ELECTRICAL SCHEMATICS
SECTION 7
ELECTRICAL SCHEMATICS
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SECTION 7
ELECTRICAL SCHEMATICS
52
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SECTION 7
ELECTRICAL SCHEMATICS
53
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SECTION 7
ELECTRICAL SCHEMATICS
54
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SECTION 7
ELECTRICAL SCHEMATICS
NOTES
55
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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.
MiddlebyCookingSystemsGroup•1400ToastmasterDrive•Elgin,IL60120•USA•(847)741-3300•FAX(847)741-4406
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