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Middleby Marshall PS724-Series Owner's Operating & Installation Manual

Ps724 series
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Marshall
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A MIDDLEBY COMPANY
owner's
operating
& installation
manual
PS724-Series OVENS
Model PS724E
©2008 Middleby Marshall
®
PS724 (Single)
Inc.
PS724-Series Electric Ovens: English
October 27, 2008
PS724 (Double)
PS724 (Triple)
Part No. 61778
Price $30.00
P: 10/08

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  • Page 1 Middleby Middleby October 27, 2008 ® Marshall Marshall Marshall Marshall Marshall A MIDDLEBY COMPANY owner's operating & installation manual PS724-Series OVENS Model PS724E PS724 (Double) PS724 (Single) PS724 (Triple) Part No. 61778 Inc. ©2008 Middleby Marshall Price $30.00 P: 10/08...
  • Page 2 This manual must be kept in a prominent, easily reachable location near the oven. It is suggested to obtain a service contract with a Middleby Marshall Authorized Service Agent. WARNING...
  • Page 3 © 2003 - Middleby Marshall, A Middleby Company. The Middleby Marshall logo is a registered trademark of Middleby Marshall, A Middleby Company. Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A. • (847) 741-3300 • FAX: (847) 741 4406...

  • Page 4: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS (Continued) Page Page SECTION 1 I. MODEL IDENTIFICATION ..........1 III. STEP-BY-STEP OPERATION ........18 SERIES PS724 ELECTRIC SPECIFICATIONS ....2 A. Startup Procedures ..........18 II. COMPONENT FUNCTION ..........4 Daily Startup ..............18 A.

  • Page 5: Model Identification

    DESCRIPTION SECTION 1 DESCRIPTION I. MODEL IDENTIFICATION The Middleby Marshall PS724-Series may be used either as a single oven or stacked for use as double or triple ovens. A single PS724-Series Oven (Figure 1-1) can be mounted on an insulated base with short legs for countertop use, or on a leg stand with a lower shelf and casters for a free standing unit.

  • Page 6: Series Ps724 Electric Specifications

    SECTION 1 DESCRIPTION PS724 SERIES OVEN SPECIFICATIONS Conveyor Belt Width 18.00″ (457 mm) Heating Zone Length 24.00″ (610 mm) Baking Area Square Feet 3.0 sq. ft. (0.28 m Overall Dimension – Standard Single Oven w/Legs - 8″ Exit tray Installed 64.00″...
  • Page 7 SECTION 1 DESCRIPTION Figure 1-4. PS724-Series Oven Components Locations...

  • Page 8: Component Function

    SECTION 1 DESCRIPTION II. COMPONENT FUNCTION (Figure 1-4) 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 30 seconds to 12 minutes;...
  • Page 9 SECTION 1 DESCRIPTION Figure 1-6. Cooling Fan...
  • Page 10 SECTION 1 DESCRIPTION Outer Plate Finger Manifold Assembly Inner Plate Baffle Figure 1-7. Air Finger.
  • Page 11 SECTION 2 SECTION 2 INSTALLATION INSTALLATION WARNING The oven must be installed on an even (level) non-flammable flooring and any adjacent walls must be non-flammable. Recommended minimum clearances are specified in the Description section of this Manual. WARNING Do not obstruct the flow of combustion and ventilation air to and from your oven. There must be no obstructions around or underneath the oven.

  • Page 12: Unloading

    NOTE: The oven, when installed, must be electrically I. UNLOADING grounded in accordance with local codes, or in the ab- Your Middleby Marshall PS724-Series Oven is shipped sence of local codes, with the National Electrical Code partially assembled. It will arrive in a carton on a crate.
  • Page 13 SECTION 2 INSTALLATION 8, 9, 10 Qty. Qty. Qty. Inc. with Inc. with Single Double Triple domestic Item Oven Oven Oven Part No. ovens? ovens? Description 61243 Base pad 59835 Top panel 15 ″ 37900-0024 (381mm) extension, for single and double ovens 22290-0009 Caster, with flat plate and brake 22290-0010...
  • Page 14 SECTION 2 INSTALLATION...
  • Page 15 SECTION 2 INSTALLATION...
  • Page 16 SECTION 2 INSTALLATION...

  • Page 17: Utility Rough-In Dimensions And Positioning For Ps724-Series Ovens

    SECTION 2 INSTALLATION UTILITY ROUGH-IN DIMENSIONS AND POSITIONING FOR PS724-SERIES OVENS WARNING DO NOT USE CONDUIT 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 Suggested dimensions are shown;...

  • Page 18: Electrical Connection Information For Ps724-Series Ovens

    SECTION 2 INSTALLATION III. ELECTRICAL CONNECTION INFORMATION IV. ELECTRIC SUPPLY FOR PS724-SERIES OVENS. Electrical connection is made through a cord and plug. A cord, plug and strain relief is supplied for Domestic oven models, only. International ovens must supply, WARNING See Electrical Specifications chart on page 2.

  • Page 19: Control Functions

    SECTION 3 OPERATION SECTION 3 OPERATION I. CONTROL FUNCTIONS Figure 3-1. PS724-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”...

  • Page 20: Component Information And Location

    SECTION 3 OPERATION II. COMPONENT INFORMATION AND bearing damage. To protect the blower motor and bearings a thermostatic override is built into the oven. LOCATION (Figures 3-1 and 3-2) If the temperature inside the oven is over 180°F (82°C) A. Door Safety Switch the main blower will continue to run after the blower switch is turned to the “OFF”...

  • Page 21: Conveyor

    SECTION 3 OPERATION 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 30 seconds to 12 minutes bake time (conveyor speed).

  • Page 22: Step-By-Step Operation

    If the blowers return to the lower, energy saving speed before the product fully exits the oven, contact your local Middleby Marshall Service Agent for timing adjust- IMPORTANT NOTE ment. The cooling fan operates when the BLOWER Power Failure switch is turned “ON”...
  • Page 23 SECTION 3 OPERATION Figure 3-6. Control Panel...

  • Page 24: Normal Operation - Step-By-Step

    SECTION 3 OPERATION IV. NORMAL OPERATION - STEP-BY-STEP Wait for the oven to heat to the setpoint temperature. Higher setpoint temperatures will require a longer wait. A.Daily Startup Procedure The oven can reach a temperature of 500°F (232°C) in approximately 10-12 minutes. Check that the circuit breaker/fused disconnect is in the on position.
  • Page 25 SECTION 3 OPERATION Display "HEAT ON" Shows the Set Point Light or the Actual Tem- Lights when the perature in degrees burner is in Fahrenheit (F) or operation. Celsius (C). "SP LOCK" Light Lights when the "SET PT" set point is locked out from changes.

  • Page 26: Quick Reference: Troubleshooting

    Check that the set temperature and bake time settings are overcooked or rectly. correct. undercooked. 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.

  • Page 27: Section 4 Maintenance

    SECTION 4 MAINTENANCE SECTION 4 MAINTENANCE WARNING Before ANY cleaning or servicing of the oven, perform the following procedure: Switch off the oven and allow it to cool. Do NOT service the oven while it is warm. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven. When all cleaning and servicing is complete: If the oven was moved for servicing, return the oven to its original location.

  • Page 28: Maintenance - Daily

    SECTION 4 MAINTENANCE I. MAINTENANCE - DAILY D. Crumb Pans (Figure 4-2) 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.

  • Page 29: Maintenance - Monthly

    MAINTENANCE II. MAINTENANCE - MONTHLY You can order non-caustic cleaner from your local autho- rized Middleby Marshall Parts Distributor in the quantities NOTE: The oven interior may require cleaning more listed below: than once a month depending on the volume of...
  • Page 30 SECTION 4 MAINTENANCE Figure 4-4. Figure 4-6. Figure 4-7. Figure 4-5. CAUTION Be careful not to bump the drive sprocket while handling the conveyor, to avoid damaging the drive shaft.

  • Page 31: Air Fingers Disassembly For Cleaning

    SECTION 4 MAINTENANCE 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). Fingers are marked in the order shown;...

  • Page 32: Reassembly Of Air Fingers

    SECTION 4 MAINTENANCE 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.
  • Page 33 SECTION 4 MAINTENANCE 5. Install fingers with center spacer between the two finger back plates to insure proper spacing Center Spacer Extended Lip Flange of Finger Manifold Figure 4-16.

  • Page 34: Reinstall End Plugs

    SECTION 4 MAINTENANCE D. Reinstall End Plugs 1. Reinstall lower end plug (has flange that extends into oven). Place and secure plastic wing nuts on the end plug. 2. Reinstall conveyor. 3. Reinstall upper end plug (no inner flange). Place and secure plastic wing nuts on the end plug.

  • Page 35: Conveyor Reassembly Into Oven

    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: Conveyor must be inserted into the drive end of Oven conveyor belt must be cool when adjusting oven.

  • Page 36: Conveyor Belt Link Removal

    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 5. Pull up on the belt link section and remove. Do not with the conveyor assembly either in or out of the oven. discard the link removed as it may be used for making Position master links at end of conveyor as shown in spare master links.

  • Page 37: Attaching Drive Chain

    SECTION 4 MAINTENANCE 6. Reconnect the inside master links (Figure 4-27.) 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″...

  • Page 38: Maintenance (3 And 6 Month)

    III. MAINTENANCE (3 and 6 MONTH) WARNING Shut OFF all electrical power and lock/tag out the switch before attempting maintenance work. NOTE: It is recommended that the 3-month and 6-month maintenance items be performed by an authorized Middleby Marshall technician.

  • Page 39: Ps724-Series Electric Oven Key Spare Parts

    SECTION 4 MAINTENANCE KEY SPARE PARTS KIT Replacement parts can be purchased from your Middleby Marshall Authorized Parts Distibutor. Keeping these key parts on hand can prevent long downtime for your oven. PS724-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT ITEM PART NO.
  • Page 40 SECTION 4 MAINTENANCE NOTES...

  • Page 41: Section 5 Troubleshooting

    30 seconds. Turn temperature Start the oven again. If the oven still does not Set the conveyor speed control to correct heat, call your Middleby Marshall Service Agency. control at correct setting. setting. Verify the food PROBLEM: preparation process.
  • Page 42 SECTION 5 TROUBLESHOOTING NOTES...

  • Page 43: Section 6 Electrical Schematics

    SECTION 6 ELECTRICAL SCHEMATICS SECTION 6 ELECTRICAL SCHEMATICS...
  • Page 44 SECTION 6 ELECTRICAL SCHEMATICS...
  • Page 45 SECTION 6 ELECTRICAL SCHEMATICS...
  • Page 46 SECTION 6 ELECTRICAL SCHEMATICS...
  • Page 47 SECTION 6 ELECTRICAL SCHEMATICS NOTES...
  • Page 48 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.

This manual is also suitable for:

Ps724e

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