Middleby Marshall PS520 User Manual

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A MIDDLEBY COMPANY

owner's operating

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manual

PS520-Series Electric Ovens: English

PS520-Series

Model

PS520E

OVENS

PS520 (Single)

PS520 (Double)

PS520 (Triple)

Part No. 52358

Price $30.00

P: 08/08 Rev. B

WARNING

FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER

APPLIANCE.

WARNING

Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operation, and maintenance instructions thoroughly before installing or servicing this equipment.

NOTICE

The warranty is demonstrated under the supervision of a factory-authorized installer.

NOT VALID

unless the oven is installed, started, and

NOTICE

Contact your authorized Service Agency to perform maintenance and

repairs. A Service Agency Directory is supplied with your oven.

NOTICE

Using any parts other than genuine Middleby Marshall factory-manufactured parts relieves the manufacturer of all warranty and liability.

NOTICE

Middleby Marshall (Manufacturer) reserves the right to

change specifications at any time.

KEEP THIS MANUAL IN A VISIBLE LOCATION NEAR THE OVEN

FOR FUTURE REFERENCE.

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, 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 SHALL BE LIMITED TO THE ORIGINAL PURCHASER ONLY AND SHALL BE EFFECTIVE FOR A PERIOD OF ONE YEAR FROM DATE OF ORIGINAL INSTALLATION, OR 18 MONTHS FROM DATE OF PURCHASE, WHICHEVER IS EARLIER, PROVIDED THAT TERMS OF PAYMENT HAVE BEEN FULLY MET.

This warranty is valid only if the equipment is installed, started, and demonstrated under the supervision of a factory-authorized installer.

Normal maintenance functions, including lubrication, cleaning, or customer abuse, are not covered by this

warranty

Seller shall be responsible only for repairs or replacements of defective parts performed by Seller’s authorized service personnel. Authorized service agencies are located in principal cities throughout the contiguous United States, Alaska, and Hawaii. This warranty is valid in the 50 United States and is void elsewhere unless the product is purchased through Middleby International with warranty included.

The foregoing warranty is exclusive and in lieu of all other warranties, expressed or implied. There are no implied warranties of merchantability or of fitness for a particular purpose.

The foregoing shall be Seller’s sole and exclusive obligation and Buyer’s sole and exclusive remedy for any action, including breach of contract or negligence. In no event shall Seller be liable for a sum in excess of the purchase price of the item. Seller shall not be liable for any prospective or lost profits of Buyer.

This warranty is effective on Middleby Marshall equipment sold on, or after, February 15, 1995.

no quibble

MIDDLEBY MARSHALL INC.

OVEN LIMITED WARRANTY

(Non U.S.A.)

The Seller warrants equipment manufactured by it to be free from defects in material and workmanship for which it is responsible. The Seller’s obligation under this warranty shall be limited to replacing or repairing, at Seller’s option, without charge, F.O.B. Seller’s factory, any part found to be defective and any labor and material expense incurred by Seller in repairing or replacing such part. Such warranty is limited to a period of one year from date of original installation or 15 months from date of shipment from Seller’s factory, whichever is earlier, provided that terms of payment have been fully met. All labor shall be performed during regular working hours. Overtime premium will be charged to the Buyer.

This warranty is not valid unless equipment is installed, started, and demonstrated under the supervision of a factory-authorized installer.

Normal maintenance functions, including lubrication, adjustment of airflow, thermostats, door mechanisms, microswitches, burners and pilot burners, and replacement of light bulbs, fuses and indicating lights, are not covered by warranty.

Any repairs or replacements of defective parts shall be performed by Seller’s authorized service personnel. Seller shall not be responsible for any costs incurred if the work is performed by other than Seller’s authorized service personnel.

When returning any part under warranty, the part must be intact and complete, without evidence of misuse or abuse, freight prepaid.

Seller shall not be liable for consequential damages of any kind which occur during the course of installation of equipment, or which result from the use or misuse by Buyer, its employees or others of the equipment supplied hereunder, and Buyer’s sole and exclusive remedy against Seller for any breach of the foregoing warranty or otherwise shall be for the repair or replacement of the equipment or parts thereof affected by such breach.

The foregoing warranty shall be valid and binding upon Seller if and only if Buyer loads, operates and maintains the equipment supplied hereunder in accordance with the instruction manual provided to Buyer. Seller does not guarantee the process of manufacture by Buyer or the quality of product to be produced by the equipment supplied hereunder and Seller shall not be liable for any prospective or lost profits of Buyer.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSOEVER. SPECIFICALLY THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE.

The foregoing shall be Seller’s sole and exclusive obligation and Buyer’s sole and exclusive remedy for any action, whether in breach of contract or negligence. In no event shall seller be liable for a sum in excess of the purchase price of the item.

Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A. • (847) 741-3300 • FAX: (847) 741 4406

iii

TABLE OF CONTENTS

SECTION 1

I. MODEL IDENTIFICATION .............................................. 1

SERIES PS520 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

I. UNLOADING ................................................................... 7

PS520 OVEN INSTALLATION

REQUIRED KITS AND EQUIPMENT .......................... 8

PARTS LIST FOR SERIES PS520 ELECTRIC OVEN

INSTALLATION KIT .................................................... 8

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS520-SERIES OVENS .................................... 12

CIRCUIT BREAKER ..................................................... 12

ELECTRICAL SPECIFICATIONS ................................. 1 2

ELECTRICAL RATING ................................................. 12

SUPPLY WIRE .............................................................. 1 2

SUGGESTED ................................................................ 12

II. VENTILATION GUIDELINES ....................................... 12

III. ELECTRICAL CONNECTION INFORMATION FOR

PS520-SERIES OVENS. ........................................... 13

IV. ELECTRIC SUPPLY FOR ELECTRIC-HEATED

OVENS ...................................................................... 12

SECTION 3 INSTALLATION

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

Page

TABLE OF CONTENTS

(Continued)

Page

IV. NORMAL OPERATION - STEP-BY-STEP ...................... 20

A.Daily Startup Procedure ........................................... 20

B. Daily Shutdown Procedure ...................................... 20

V. QUICK REFERENCE: TROUBLESHOOTING .............. 22

SECTION 4 MAINTENANCE

I. MAINTENANCE - DAILY ............................................ 24

A. Exterior ..................................................................... 24

B. Cooling Fan ............................................................... 24

C. Conveyor Belt .......................................................... 2 4

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 ............................................. 3 4

III. MAINTENANCE - EVERY 3 MONTHS ......................... 35

A. Electrical Terminals ................................................ 35

B. Ventilation ................................................................ 35

IV. MAINTENANCE - EVERY 6 MONTHS ........................ 35

PS520-SERIES ELECTRIC OVEN KEY SPARE

PARTS ....................................................................... 36

KEY SPARE PARTS KIT ............................................... 36

SECTION 5 TROUBLESHOOTING

Troubleshooting Charts ...................................................... 3 7

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, PS520 .................. 51

Wiring Diagram, E380-480V 50/60/1, PS520 .................. 52

Wiring Diagram, E230-240V CE PS520/1820S ............... 53

Wiring Diagram, E380-400V CE PS520/1820S ............... 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.

SECTION 1

DESCRIPTION

I. MODEL IDENTIFICATION

The Middleby Marshall PS520-Series may be used either as a single oven or stacked for use as double or triple ovens.

A single PS520-Series Oven (Figure 1-1) is mounted on a base pad with legs. A double oven (Figure 1-2) consists of two,

stacked,

consists of three stacked single ovens. The lower oven is mounted on a base pad.

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.

single ovens. A triple oven (Figure 1-3)

SECTION 1

DESCRIPTION

Figure 1-1. Single PS520 Oven

Figure 1-2. Double PS520 Oven

Figure 1-3. Triple PS520 Oven

SECTION 1 DESCRIPTION

PS520 SERIES OVEN SPECIFICATIONS

Conveyor Belt Width 18.00″ (457mm)

Heating Zone Length 20.00″ (5098mm)

Baking Area Square Feet 2.5 sq. ft. (0.23 sq. m.)

Overall Dimension Standard Single Oven w/Legs 42.00″ (1067mm) L ×

Overall Dimension Double Oven 42.00″ (1067mm) L ×

Overall Dimension Triple Oven 42.00″ (1067mm) L x

Weight of Single Oven 250 lb (93.3kg)

Shipping Weight 325 lb (121.3kg)

Shipping Cube 22.1 ft3 (0.62 m3)

Operating Range 8.3 kW/hr

Maximum Operating Temperature 550°F (287°C)

Warm-up Time 20 min.

Belt Speed Limits 1-10 minutes

35.21″ (894mm) W ×

21.72″ (786mm) H ×

35.21″ (894mm) W ×

37.27″ (947mm) H x

35.21″ (894mm) W ×

52.82″ (1342mm) H ×

SERIES PS520 ELECTRICAL SPECIFICATIONS

Main Blower & Control Circuit Phase Frequency Amperage Poles Wires

Elements Voltage Voltage Draw

208-240V 208-240V 1 Ph 50/60 Hz 39.9 Amp 2 Pole 3 Wire

HEATER AMPERAGE

Voltage kW Amp

208 8.3 39.9 230 7.6 33.0 240 8.3 34.6

380V Export 208-240V 1 Ph 50/60 Hz 21.8 Amp 3 Pole 4 Wire

HEATER AMPERAGE

Voltage kW Amp

380 8.3 21.8 400 9.2 23.0

480V 208-240V 1 Ph 50/60 Hz 17.3 Amp 3 Pole 4 Wire

HEATER AMPERAGE

Voltage kW Amp

480 8.3 17.3

(2 hot, 1 grd)

(2 hot, 1neut, 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

SECTION 1

DESCRIPTION

Figure 1-4. PS520-Series Oven Components Locations

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 the air fingers. The BLOWER switch must be set to “ON” or “I” for oven warmup and baking.

C. Electric Heaters

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.

Blower Assembly

D. Cooling Fan — See Figure 1-5 and Figure 1-6

The cooling fan is located in the back of the oven. The cooling fan draws air through its grille, blowing it through the blower motor compartment 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. Outer Plate - The Outer Plate is the removable covering with tapered holes, which direct the air 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 - The Manifold is the assembly which slides on tracks into the oven plenum.

Right Control Box

Figure 1-5. Machinery Compartment

Components

SECTION 1

DESCRIPTION

Figure 1-6. Cooling Fan

SECTION 1 DESCRIPTION

Half Blank Plate

F2. Blank Plates

1. Blank Plates- The Blank Plates are available to install on the plenum where an air finger is not required.

Outer Plate

Blank Plate

Inner Plate

Finger Manifold Assembly

Baffle

Figure 1-7. Blank Plates (two sizes) and an Air Finger.

SECTION 2

INSTALLATION

SECTION 2

INSTALLATION

NOTE: The oven, 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

There must be adequate clearance between the oven and any adjacent combustible construction. Clearance must also be provided for servicing and for operation.

CAUTION

It is recommended that the oven be placed under 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

I. UNLOADING

Your Middleby Marshall PS520-Series Oven is shipped partially assembled. It will arrive in a carton on a crate.

Carton size for a PS520-Series Oven is:

44-1/4″ (1124mm) Long ×

37-1/2″ (953mm) Wide ×

23″ (584mm) High ×

The crate and carton must be examined before signing the 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.

On ovens with the Machinery Drive Compartment 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.

SECTION 2 INSTALLATION

ITEM

NO. QTY PART NO. DESCRIPTION

1 4 3101908 LEG 4″ AD FT 2 2 48392 INSULATION BOTTOM TRAY 3 1 48394 BOTTOM TRAY WELDMENT 4 1 48396 TOP COVER 5 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8

6 1 52358 OWNER'S OPERATING & INSTALLATION MANUAL

PARTS LIST FOR SERIES PS520 ELECTRIC OVEN

INSTALLATION KIT

Single and Double Stack Ovens

P/N 48397

PARTS LIST FOR SERIES PS520 ELECTRIC OVEN

INSTALLATION KIT

Triple Stack Oven

P/N 54593

ITEM

NO. QTY PART NO. DESCRIPTION

1 2 48392 INSULATION BOTTOM TRAY 2 1 48394 BOTTOM TRAY WELDMENT 3 1 48396 TOP COVER

4 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8 5 4 M3828 PIN, ALIGNMENT

6 1 52358 OWNER'S OPERATING & INSTALLATION MANUAL

Figure 2-1. PS520-Series Electric Oven Installation Parts

SECTION 2

INSTALLATION

Figure 2-5. MODEL PS520 SINGLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch minimum

to 3-3/4 inch maximum in 1/2 inch increments.

SECTION 2 INSTALLATION

Figure 2-6. MODEL PS520 DOUBLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch minimum

to 3-3/4 inch maximum in 1/2 inch increments.

SECTION 2

INSTALLATION

Figure 2-7. MODEL 520 TRIPLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch minimum

to 3-3/4 inch maximum in 1/2 inch increments.

SECTION 2 INSTALLATION

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS520-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

Separate circuit breaker with lockout/tagout electrical shutoff for each oven. Wire each oven separately.

50 Amp circuit breaker for 208-240V, or 30 Amp circuit breaker for 380-480V.

ELECTRICAL SPECIFICATIONS

DOMESTIC: 208V main blower motors and elements,

1 Ph, 39.9 Amp draw, 50/60 Hz, 208-240V control circuit, 2 pole, 3 wire system per oven (2 hot, 1 grd).

NOT

use conduit for ground.

DOMESTIC: 240V main blower motors and elements,

1 Ph, 34.6 Amp draw, 50/60 Hz, 208-240V control circuit, 2 pole, 3 wire system per oven (2 hot, 1 grd).

230V main blower motors and elements, 1 Ph, 33.0 Amp draw, 50/60 Hz, 208-240V control circuit, 2 pole, 3 wire system per oven (2 hot, 1 grd).

NOT

use conduit for ground.

EXPORT: 380V elements, 1 Ph, 23.0 Amp draw, 50/60 Hz,

208-240V control circuit and main blower motor, 4 pole, 4 wire system per oven (2 hot, 1 neutral, 1 grd).

400V elements, 1 Ph, 21.8 Amp draw, 50/60 Hz, 208-240V control circuit and main blower motor, 4 pole, 4 wire system per oven (2 hot, 1 neutral, 1 grd).

NOT

use conduit for ground.

EXPORT: 480V elements, 1 Ph, 17.3 Amp draw,

50/60 Hz, 208-240V control circuit and main blower motor, 2 pole, 4 wire system per oven (2 hot, 1 neutral, 1 grd).

NOT

use conduit for ground.

Figure 2-9. Typical PS520-Series Oven(s)

Installation

ELECTRICAL RATING

7.6 – 9.2 kW/hr.

SUPPLY WIRE

Supply wire size must be in accordance with the National Electrical Code (current edition) and must be in compliance 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.

CAUTION

UNIT MUST HAVE AIR VENT PLATES INSTALLED OR WARRANTY WILL BE VOID.

II. VENTILATION GUIDELINES

A mechanically driven ventilation system is recommended for the PS520 Series Middleby Marshall conveyorized electric ovens.

Local codes and conditions vary greatly from one area to another and must be complied with. Following are the suggested 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.

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).

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 ovem by keeping the oven away from the rear wall.

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.

III. ELECTRICAL CONNECTION INFORMATION

FOR PS520-SERIES OVENS.

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.

Check the oven data plate (Figure 2-10) 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 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.

A fused disconnect switch or a main circuit breaker (customer furnished) supply line for each oven; it is recommended that this switch/ circuit breaker have lockout/tagout capability. The electric supply connection must meet all national and local electrical code requirements. Copper is the recommended material for the electrical supply conductors.

MUST be installed in the electric

IV. ELECTRIC SUPPLY FOR

ELECTRICALLY HEATED OVENS

Power requirements for electrically heated ovens are usually 208 - 240VAC, 1-phase, 3-wire (2 ‘hot’, 1 ground), although ovens built for export can have power requirements of 380VAC and 480VAC. (These ovens have a 4-wire system.) A 1.5″ (38mm) diameter cutout/hole in the back of the machiney compartment provides access for the electrical supply connections on 380V and 480V units. 208V and 240V units have a cord and plug. Using flexible cable(s) for the electrical power supply conductors requires a 2″ (51mm) strain-relief fitting (not furnished) to enable safe access to the terminal block from which oven power is distributed.

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 PS520-Series Oven ranges from a minimum of 17.3 amperes to a maximum of

39.9 amperes.

Typical specifications for each PS520-Series Oven are 208V or 240V, 1-phase, 3-wire, 8.3kW; this oven requires 50-ampere service. A PS520-Series Double Oven (Figure 1-2) installation would require two 50-ampere service connections, one for each oven; the 8.3kW power consumption also doubles for such an installation to 16.6kW.

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 2-11. Junction Connection BoxFigure 2-10. Typical Electric Oven Data Plate

SECTION 2 INSTALLATION

NOTES

I. CONTROL FUNCTIONS

SECTION 3

OPERATION

SECTION 3

OPERATION

Figure 3-1. PS520-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.

SECTION 3 OPERATION

II. COMPONENT INFORMATION AND

LOCATION (Figures 3-1 and 3-2)

A. Door Safety Switch

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.

CAUTION

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 bearings a thermostatic override is built into the oven.

If the temperature inside the oven is over 180°F (82°C) the main blower will continue to run after the blower switch is turned to the “OFF” or “O” position.

C. Heat 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. Both switches must be closed before the heating elements an be energized.

D. Temperature Controller

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. The heat is on for the time required to maintain a constant oven temperature.

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

E. Conveyor

The on-off switch for the conveyor motor is on the control panel. Also on the control panel is the digital conveyor 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.

SECTION 3

OPERATION

See Figures 3-4 and 3-5.

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 conveyor 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 lockout or tagout all electrical power to the oven before attempting to clean or service this oven.

Figure 3-3. Conveyor Speed Digital Control

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

SECTION 3 OPERATION

WARNING

OVEN MUST BE KEPT CLEAR OF

COMBUSTIBLES AT ALL TIMES.

III. STEP-BY-STEP OPERATION

A. Startup Procedures

Daily Startup

1. Turn the BLOWER switch (Figure 3-6) to the “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.

2. Check to see if the cooling fans (see Figure 1-8) are operating when the blower switch (see Figure 3-6) is turned “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.

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).

4. Set the temperature controller to the desired baking temperature.

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.

6. Oven will reach a baking temperature of 500°F (232°C) in approximately 20 minutes. Allow the oven to cycle for 30 minutes after it has reached desired bake temperatue. The oven is now ready for baking.

Power Failure

In case of power failure, turn off all switches and remove product. After power has been reestablished follow normal startup procedure.

B. Shutdown Procedure

1. Turn the BLOWER and HEAT switches to “OFF” or “O”.

NOTE: The blowers will remain on until the oven temperature cools down to 200°F (93°C) at which time they will stop automatically.

2. Make certain that there are no products left on the conveyor inside the oven. Turn the CONVEYOR switch to “OFF” or “O”.

3. Turn the CONVEYOR switch (Figure 3-6) to the “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.

SECTION 3

OPERATION

Figure 3-6. Control Panel

SECTION 3 OPERATION

IV. NORMAL OPERATION - STEP-BY-STEP

A.Daily Startup Procedure

1. Check that the circuit breaker/fused disconnect is in the on position.

2. Turn the "BLOWER"

( ) switch to the “ON”

("I") position.

3. Turn the "CONVEYOR" ( ) switch to the “ON” ("I") position.

4. If necessary, adjust the conveyor speed setting by pressing the pushbuttons on the conveyor speed controller to change the displayed bake time.

5. Adjust the temperature controller to a desired set temperature, if necessary.

• Press the Set Point

and Unlock keys at the same time. Wait for the "SET PT" light to turn on.

wait

for

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.

8. (Optional) Press the Temperature (

the Actual Temperature in the display, and wait for the "ACTUAL TEMP" light to turn on. This allows you to monitor the oven temperature as it rises to the setpoint.

9. Allow the oven to preheat for 10 minutes after it has reached the set point temperature.

B. DAILY SHUTDOWN PROCEDURE

1. Turn the "HEAT" ( "BLOWER" ( ches to the "OFF" ("O")

position. Note that the blowers will remain in operation until the oven has cooled to below 200°F (93°C).

2. Make certain that there are no products left on the conveyor inside the oven. Turn the "CONVEYOR" ( the "OFF" ("O") position.

) key to show

) and

) swit-

) switch to

wait

for

• Press the Up Arrow and Down Arrow Keys as necessary to adjust the setpoint.

6. Turn the "HEAT" ( ) switch to the "ON" ("I") position, and wait for the "HEAT ON" light to turn on.

wait

for

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.

CAUTION

In case of power failure, turn all switches to the “OFF” ("O") position and remove the product. After the power has been restored, perform the normal startup procedure. IF THE OVEN WAS SWITCHED OFF FOR LESS THAN 5 MINUTES, MINUTES BEFORE RESTARTING THE OVEN.

WAIT FOR AT LEAST FIVE

SECTION 3

OPERATION

"SP LOCK"

Light

Lights when the set point is locked out from changes.

This setting can

only be changed by

service personnel.

OVERTEMP

Light

Lights when the oven

temperature is

greater than 650°F

(343°C). Refer to

Quick Reference:

Troubleshooting in

this section.

Display

Shows the Set Point

or the Actual Tem-

perature in degrees

Fahrenheit (F) or

Celsius (C).

"HEAT ON"

Light

Lights when the

burner is in

operation.

"SET PT" (setpoint)

Light

Lights when the

set point is shown

in the display.

"ACTUAL TEMP"

Light

Lights when the Actual Temperature is shown

in the display.

Temperature

Key

Press this key once

to view the Actual

Temperature in the

Display.

together with the Set

Point Key to allow the

changed. Changes

can only be made for

Unlock Key

Press this key

Set Point to be

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.

Service Key

Service use

only.

Set Point Key

Press this key

together with the

Unlock Key to allow

the Set Point to be

changed.

Changes can only be

made for 60 sec-

onds.

SECTION 3 OPERATION

V. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM PROBLEM SOLUTION

light is lit, food product is

undercooked

Oven will not

turn on at all

appears in display, oven is not heating

Oven will not heat

The oven temperature exceeded 650°F (343°C), and the burner was automatically shut down.

Electrical power may not be reaching the oven, or the controls may be set incorrectly.

The oven did not reach 200°F (93°C) within 15 minutes of startup, and the oven has stopped heating.

Controls may be set incorrectly.

• 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.

• Check that the circuit breaker/fused disconnect is turned on.

• Check that the "BLOWER" position.

• Turn the "HEAT" ( ( )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 correctly set.

• Check that both the "BLOWER" 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).

( ) Switch is in the “ON” ("I")

), "BLOWER" ( ), and "CONVEYOR"

( ) and "HEAT" ( ) Switches

Oven is operating, but

little or no air is blowing

from air fingers

Conveyor moves with a

jerky motion, or will not

move at all

Food products are

overcooked or undercooked.

Air fingers may have been reassembled incorrectly after cleaning.

Conveyor may be jammed on an object in the oven, or conveyor belt or drive chain tension may be incorrect.

Controls may be set incorrectly.

• Turn the oven to the “OFF” or “O” position, and allow it to cool. Disconnect electrical power to the oven.

• Refer to Section 4, bling the air fingers.

• 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, the conveyor and drive chain tension.

• Check that the set temperature and bake time settings are correct.

Maintenance, for instructions on reassem-

Maintenance, for instructions on checking

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.

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

disassemble, clean or service oven(s). Never disas-

semble 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.

SECTION 4

MAINTENANCE

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 connector 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.

SECTION 4 MAINTENANCE

I. MAINTENANCE - DAILY

A. Exterior

Everyday you should clean the outside of the oven with a soft cloth and mild detergent.

WARNING

Never use a water hose or pressurized steam cleaning equipment when cleaning the oven.

B. Cooling Fan

1. ONE COOLING FAN GRILLE AT THE REAR OF THE OVEN MUST BE CLEANED DAILY - Clean grille with a stiff nylon type brush.

2. Check the air intake of the cooling fan daily. The best time to check is right after starting the oven.

IMPORTANT NOTE

The cooling fan operates when the blower switch is turned to “ON” (“I”). It must operate to keep the electrical control cabinet below 140°F (60°C).

D. Crumb Pans (Figure 4-2)

WARNING

Crumb pan is extremely hot while oven is operating. Allow oven to cool before removing crumb pan.

When the oven is cool remove and clean the crumb pan at 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.

Cooling Fan Grille

WARNING

IF FAN BLADE IS NOT ROTATING, BROKEN, OR FAN ASSEMBLY IS MISSING FROM MAIN BLOWER MOTOR SHAFT, DO NOT OPERATE OVEN. REPLACE COOLING FAN BLADE BEFORE OPERATING OVEN. Serious damage 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 unloading end of the conveyor, and with a brush, remove food particles (crumbs, etc.) clinging to the conveyor belt, brushing them into the crumb pan.

Figure 4-1. Oven Cooling Fans

Figure 4-2. Conveyor Belt and

Crumb Pan Cleaning

II. MAINTENANCE - MONTHLY

NOTE: The oven interior may require cleaning more than once a month depending on the volume of baking. To clean the interior, you have to disassemble some parts of the oven.

When cleaning your Series PS520 Oven note the following:

PRECAUTIONS-

1. Do not use excessive water or saturation of oven insulation will occur.

2. Do not use a caustic oven cleaner or the aluminized finger manifold surfaces will be severely damaged.

When cleaning your oven, first remove all heavy debris with a vacuum cleaner. Use a damp cloth for light cleaning. For heavier cleaning of baked on grease and carbon deposits use a non-caustic cleaner that will not react with

SECTION 4

MAINTENANCE

the aluminized finger manifold surfaces.

You can order non-caustic cleaner from your local authorized Middleby Marshall Parts Distributor in the quantities listed below:

Part # Quantity

27170-0244 Case of Quarts (6)

27170-0246 Case of Gallons (4)

A. Removing Conveyor From Oven For Cleaning

1. Remove entry and exit trays.

2. Loosen (do not remove) two screws on housing guard.

3. Remove motor housing guard.

4. Lift conveyor and remove chain.

Figure 4-3.

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

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 blank or choke plate is used, mark that plate also. 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 T2 T3

B1 B2 B3

2. Slide blank plates straight out.

SECTION 4

MAINTENANCE

Figure 4-9.

4. With air fingers out, place them in an upright position to remove the outer plate.

Figure 4-8.

3. Remove air fingers.

NOTE: Some oven users require a custom finger arrangement 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).

5. Gently step on the lip of the finger and pull the outer plate off.

Remove the air fingers, pull the finger at the back side - pull straight out.

Figure 4-10.

SECTION 4 MAINTENANCE

6. To remove the inner plate, pull the plate out and then up.

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.

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 4-14.

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.

Figure 4-12. Standard Lower Finger

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 4-15.

Figure 4-13. Standard Upper Finger

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 outside of the groove which will prevent inserting the finger in the groove if the outer plate is moved away from the flange of the finger manifold.

SECTION 4

MAINTENANCE

Figure 4-16.

Extended Lip

Flange of Finger Manifold

Tab on Outer Plate

Figure 4-17.

SECTION 4 MAINTENANCE

5. Install fingers and blank plates correctly with edges interlocked and no space between edges.

Top Finger

Tab on Outer Plate of Finger Located in Groove

Top Finger

Incorrect - Too Much Space

Blank Plate

Incorrect - Too Much Space

Blank Plate

Tab on Outer Plate of Finger Located in Groove

Top Finger

Tab on Outer Plate of Finger Located in Groove

Correct Edges Overlap Completely

Blank Plate

Figure 4-18.

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.

SECTION 4

MAINTENANCE

Figure 4-19.

Figure 4-20.

SECTION 4 MAINTENANCE

E. Conveyor Reassembly Into Oven

1. Lift conveyor and position it in oven as shown.

NOTE: Conveyor may be inserted into either end of oven. 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.

Figure 4-21.

2. Reinstall the conveyor extension.

F. Checking Conveyor Belt Tension

WARNING

Oven conveyor belt must be cool when adjusting belt. Do not adjust belt if HOT.

1. With the conveyor assembly in the oven, stand at one end of conveyor and check tension by lifting the conveyor 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 entire link must be removed. Use the following procedure “H. Conveyor Belt Link Removal” to remove a link. If conveyor belt is under proper tension proceed directly to “J. Attaching Drive Chain”.

Conveyor Extension

Figure 4-23.

Figure 4-22.

SECTION 4

MAINTENANCE

G. Conveyor Belt Link Removal

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.

Master Links

Figure 4-24.

4. Unhook the link to be removed.

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 replacing and use the section of conveyor belt furnished in your installation kit to replace them.

2. Using long nose pliers, unhook master links at left end of conveyor as shown in Figure 4-25.

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.

Figure 4-27.

NOTE: Before connecting the inside master links, notice

that these links have a correct position (Figure 4-28). The link at the right is in the correct (horns up) position for inserting into the conveyor belt. The horns facing down are in the incorrect position.

Correct Position

Incorrect Position

Figure 4-28.

Figure 4-26.

SECTION 4 MAINTENANCE

6. Reconnect the inside master links (Figure 4-29.)

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

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 4-30.

7. Reconnect the outside master links.

8. Replace all parts removed from the oven.

Figure 4-32.

3. The angle plate located on the underside of the conveyor must be against the lower end plug. This is true on both sides of oven.

Crumb Pan

Mounting

Bracket

Lower End Plug

Figure 4-33.

Figure 4-31.

SECTION 4

MAINTENANCE

4. Reattach conveyor guard to control panel and secure two screws.

Install both upper end plugs.

Figure 4-34.

III. MAINTENANCE - EVERY 3 MONTHS

A. Electrical Terminals

Open the control cabinet door by removing the three screws from the control cabinet door. Tighten all electrical control terminal screws including the electrical contactor terminal screws as shown in Figure 4-35.

Figure 4-35.

B. Ventilation

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.

NOTE: It is recommended that the 3-month maintenance be performed by an authorized Middleby Marshall technician.

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.

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.

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

PS520-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT (Figure 4-36)

ITEM PART NO. ENGLISH DESCRIPTION QUANTITY

1 47321 Kit, Temperature Control On/Off Pid 1

2 51402 Relay, 100A 1

3 58500 Conveyor Drive Motor and Magnet 1

4 60542 Conveyor Speed Control 1

5 33812-5 Thermocouple* 1

6 50715 Heater Element, 208V 1

6 51017 Heater Element, 240V 1

6 51958 Heater Element, 380V 1

6 51961 Heater Element, 480V 1

7 57408 Contactor 1

8 60598 Air Switch 1

parts that can reduce serious downtime and loss of production, if a failure occurs.

Replacement parts for this kit can be purchased from your Middleby Marshall Authorized Parts Distributor.

* 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 PS520 is 600 degree's.

Figure 4-36.

SECTION 5

TROUBLESHOOTING

SECTION 5

TROUBLESHOOTING

PROBLEM:

PRODUCTS ARE OVERCOOKED

OR UNDERCOOKED

Check for correct

setting of conveyor

speed control.

Set the conveyor speed

control at correct setting.

Verify the food

preparation process.

If products still cook incorrectly,

call your Middleby Marshall

Service Agency.

setting on tempera-

Check for correct

ture controller.

Turn temperature

control to correct

setting.

PROBLEM:

OVEN BLOWER AND CONVEYOR OPER-

ATE, YET THE OVEN IS NOT HEATING

Reset the temperature controller

to a new setting (above 200°F),

after turning the BLOWER switch

to off for 30 seconds.

Start the oven again. If the oven still does not

heat, call your Middleby Marshall Service Agency.

PROBLEM:

CONVEYOR WILL NOT HOLD PROPER

SPEED OR WILL NOT RUN AT ALL

Check whether the conveyor is jammed on something in oven.

PROBLEM:

OVEN DOES NOT HEAT

Check to see if both BLOWER switch and HEAT switch are in

the “ON” or “I” position.

If oven does not heat, call your

Middleby Marshall Service Agency.

PROBLEM:

BLOWER MOTOR IS RUNNING, YET LITTLE

OR NO AIR BLOWS FROM AIR FINGERS

Air fingers reassembled incorrectly,

after cleaning.

Assemble air fingers correctly, after cleaning.

Refer to Section 4 procedure, or call your

Middleby Marshall Service Agency.

Check for proper tension of conveyor drive

chain and conveyor belt. Refer to Section 4 for

correct procedure.

Check that the conveyor

drive sprocket is tight.

If conveyor still does not run correctly, contact

your Middleby Marshall Service Agency.

PROBLEM:

OVEN DOES NOT TURN ON WHEN ITS

SWITCHES ARE TURNED ON

Check that all electric supply switches are set to

the “ON” or “I” position. Then, start the oven.

If oven still will not start, contact your Middleby

Marshall Service Agency.

SECTION 5 TROUBLESHOOTING

NOTES

SECTION 6 - PARTS LIST

SECTION 6

PARTS LIST

ENGLISH

SECTION 6 PARTS LIST

ENGLISH

SECTION 6

PARTS LIST

ENGLISH

(INCLUDES ITEM 5 EYEBROW)

(INCLUDES ITEM 6 EYEBROW)

SINGLE OVEN EXPLODED VIEW

1 1 48382 UPPER LH END PLUG ASSEMBLY

2 1 48387 LOWER LH END PLUG ASSEMBLY

3 1 48408 LOWER RH END PLUG ASSEMBLY

4 1 48412 UPPER RH END PLUG ASSEMBLY

5 1 48378 EYEBROW, UPPER LH END PLUG ASSEMBLY

6 1 48410 EYEBROW, UPPER RH END PLUG ASSEMBLY

ITEM QTY PART NO. DESCRIPTION

7 4 51398 END PLUG MOUNTING BRACKET ASSEMBLY .875

(208/240 V MODELS ONLY)

8 8 21296-0005 SCREW, HEX HEAD, WSHHD 12-14X3/4 SS BSD

9 6 36452 NUT, WING-PLASTIC 1/4-20

10 4 3101908 LEG, 4” ADJ FT (NPS)

11 1 48395 BOTTOM TRAY ASSEMBLY

12 1 48396 COVER, TOP

13 4 51387 SCR, MS, SLT TRHD 8-32X1/2 18-8

14 1 M10434 CORDSET, 50 AMP 250V 2P 3W

15 1 45739 NAMEPLATE, MM

16 1 47862 ASSY, COVER, MOTOR

SECTION 6 PARTS LIST

ENGLISH

SECTION 6

PARTS LIST

ENGLISH

RELAY PANEL

1 1 33812-5 THERMOCOUPLE, TYPE “J”, SHIELDED 2.50X120”

ITEM QTY PART NO. DESCRIPTION

2 1 28021-0047 SWITCH, INTERLOCK, 10A, NO2P

(208/240 V MODELS ONLY)

3 1 51402 RELAY, HEATSINK 480VAC 100A

4 1 51961 ELEMENT, HEATING, 480V

4 1 51958 ELEMENT, HEATING 380V

4 1 51017 ELEMENT, HEATING 240V

4 1 50715 ELEMENT, HEATING, 208V

5 1 57408 CONTACTOR, 208/240V, 65A, 50/60 Hz

6 1 3003946 BLOCK, POWER 3POLES

7 1 M10434 CORDSET, 50 AMP, 250V ,2P 3W

8 1 50610 SWITCH, AIR 0.16 IN. WC

9 1 22450-0297 TUBING, SILICONE, 27"

SECTION 6 PARTS LIST

ENGLISH

SECTION 6

PARTS LIST

ENGLISH

BLOWER ASSEMBLY

1 1 28021-0061 SWITCH, MOMENTARY-1OA, NO 2 POLE

2 2 30927 BUMPER, WINDOW

3 1 51399 FAN, COOLING, 230V AC, 295 CFM

ITEM QTY PART NO. DESCRIPTION

4 2 52244 MOTOR, BLOWER, CW, 208/230 50/60HZ

5 2 57258 PLATE, AIR VENT

6 4 7007413 SCR, SHOULDER 10-32X, 34 18-8

7 1 31497 GUARD, COOLING FAN (NOT SHOWN)

8 1 57474 TUBE, ALUMINUM, 1/4", AIR SWITCH (15125-0002)

9 3 57476 CLAMP, AIR TUBE

10 1 22450-0297 TUBING, SILICONE, 27"

SECTION 6 PARTS LIST

ENGLISH

SECTION 6

PARTS LIST

ENGLISH

CONTROL PANEL

I 3 46521 KIT BLOWER SWITCH CONTAINS ((1) 44697, (1) 44696))

2 3 44697 CONTACT BLOCK

3 3 44696 SELECTOR SWITCH

ITEM QTY PART NO. DESCRIPTION

4 1 60542 CONVEYOR SPEED CONTROL W/DIGITAL SPEED DISPLAY

5 1 37503 DIGITAL SPEED CONTROL (DISPLAY ONLY)

6 1 50990 CONTROL, COMBO 4-20MA BURST

7 1 28041-0011 CONTACTOR, 208/240V

8 1 31504 TRANSFORMER, 230V(P)/120V(S), 200VA

9 1 28021-0047 SWITCH, INTLCK, 1OA, NO2P

10 1 33983 CONTROL, ELECTRIC, HI-LIMIT, 24OV

11 1 58500 MOTOR, CONVEYOR DRIVE

12 1 50163 KIT, CONVEYOR PICK-UP

13 1 35145 SWITCH, PUSHBUTTON, MOLVENO, 250V

14 2 45036 BREAKER, CIRCUIT 240V, 3A

15 1 48635 BREAKER, CIRCUIT 240V, 0.3A

16 1 33812-5 THERMOCOUPLE, TYPE “J”, SHIELDED, 2.50X1 20”

SECTION 6 PARTS LIST

ENGLISH

SECTION 6

PARTS LIST

ENGLISH

SINGLE CONVEYOR

1 1 48471 WELDMENT

2 4 M4817 BEARING, RULON

3 1 M4815 SHAFT, DRIVE

ITEM OTY PART NO. DESCRIPTION

4 1 51408 SHAFT, IDLER

5 10 M4818 SPROCKET, WIRE BELT

6 1 M7471 BELT, WIRE, STN STL 18" X 7.5` LONG

7 1 50060 LINK, MASTER LEFT 1/2P-18”

8 1 50062 LINK, MASTER CENTER 1/2P-18”

9 1 50061 LINK, MASTER RIGHT 1/2-18

10 1 55567 ASSY, CHAIN HIGH SPEED

11 1 55217 SPROCKET, CHAIN #25-20T-1/2 CONVEYOR SHAFT

10B 1 55566 CHAIN, #25 LINK

10A 1 3101212 LINK, MASTER, #25 CHAIN

12 1 45349 SPROCKET, 25B25 w/5/16 BORE DRIVE MOTOR

13 1 58500 MOTOR, CONVEYOR DRIVE

14 1 50163 KIT, CONVEYOR PICK-UP

15 1 30153 BRUSHES

16 1 51297 EXTENSION, CONVEYOR 6

17 1 51296 EXTENSION, CONVEYOR 12

18 2 48469 PAN, CRUMB

19 2 51409 PAN, CRUMB VENTED (SHIPPED STANDARD)

SECTION 6 PARTS LIST

ENGLISH

NOTES

ELECTRICAL SCHEMATICS

SECTION 7

ELECTRICAL SCHEMATICS

SECTION 7

Wiring Diagram, E208-240 50/60/1, PS520

SECTION 7 ELECTRICAL SCHEMATICS

Wiring Diagram, E380-480V 50/60/1, PS520

SECTION 7

ELECTRICAL SCHEMATICS

Wiring Diagram, E230-240V CE PS520/1820S

SECTION 7 ELECTRICAL SCHEMATICS

Wiring Diagram, E380-400V CE PS520/1820S

NOTES

SECTION 7

ELECTRICAL SCHEMATICS

WARNING

Improper installation, adjustment, alteration, service or maintenance

can cause property damage, injury or death. Read the installation,

operating and maintenance instructions thoroughly before

installing or servicing this equipment.

NOTICE

During the warranty period, ALL parts replacement and servicing should be performed by

your Middleby Marshall Authorized Service Agent. Service that is performed by parties

other than your Middleby Marshall Authorized Service Agent may void your warranty.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts relieves

the manufacturer of all warranty and liability.

NOTICE

Middleby Marshall reserves the right to change specifications at any time.

Middleby is proud to support the Commercial Food Equipment Service Association (CFESA). We recognize and applaud CFESA's ongoing efforts to improve the quality of technical service in the industry.

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

www.middleby.com

Middleby Marshall PS520 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual