Middleby Marshall PS724-Series Electric Ovens: English October 27, 2008 ® A MIDDLEBY COMPANY owner's operating & installation manual PS724-Series OVENS Model PS724E PS724 (Single) ©2008 Middleby Marshall Inc. PS724 (Double) PS724 (Triple) Part No. 61778 Price $30.
NOTICE: This Owner's Operating and Installation Manual should be given to the user. The operator of the oven should be familiar with the functions and operation of the oven. 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 FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
Model No. Modéle No. Serial No. Serié No. Installation Date Date d'installation MIDDLEBY MARSHALL NO QUIBBLE LIMITED WARRANTY (U.S.A. ONLY) MIDDLEBY MARSHALL INC. OVEN LIMITED WARRANTY (Non U.S.A.) The Seller warrants equipment manufactured by it to be free from defects in material and workmanship for which it is responsible. The Seller’s obligation under this warranty shall be limited to replacing or repairing, at Seller’s option, without charge, F.O.B.
TABLE OF CONTENTS TABLE OF CONTENTS (Continued) Page SECTION 1 I. MODEL IDENTIFICATION .............................................. 1 SERIES PS724 ELECTRIC SPECIFICATIONS ................. 2 II. COMPONENT FUNCTION ............................................. 4 A. Conveyor Motor and Conveyor Belt ........................ 4 B. Blower Fan ................................................................. 4 C. Cooling Fan ................................................................ 4 D.
SECTION 1 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. A double oven (Figure 1-2) consists of two, stacked, single ovens. A triple oven (Figure 1-3) consists of three stacked single ovens.
SECTION 1 DESCRIPTION PS724 SERIES OVEN SPECIFICATIONS Conveyor Belt Width Heating Zone Length Baking Area Square Feet Overall Dimension – Standard Single Oven w/Legs - 8″ Exit tray Installed Overall Dimension – Double Oven Overall Dimension – Triple Oven Weight of Single Oven Shipping Weight Shipping Cube Operating Range Maximum Operating Temperature Warm-up Time Belt Speed Limits 18.00″ (457 mm) 24.00″ (610 mm) 3.0 sq. ft. (0.28 m2) 64.00″ (1625 mm) L × 36.00″ (914 mm) W × 43.69″ (1110 mm) H × 64.
SECTION 1 DESCRIPTION 2EMOVABLE %ND 0LUG 5PPER 2EMOVABLE #ONVEYOR !SSEMBLY 4EMPERATURE #ONTROLLER 3PEED #ONTROL -AIN "LOWER 3WITCH (EAT #ONVEYOR 3WITCH 2EMOVABLE %ND 0LUG ,OWER #ASTERS Figure 1-4.
SECTION 1 DESCRIPTION II. COMPONENT FUNCTION (Figure 1-4) #OOLING &AN 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; this is the time that a product can take to pass through the oven. "LOWER -OTOR B.
SECTION 1 DESCRIPTION 0OWER #ABLE %NTRANCE "LOWER -OTOR !CCESS 0OWER #ABLE %NTRANCE "LOWER -OTOR !CCESS #ONNECTION "LOCK !CCESS #OOLING &AN 'RILLE #OOLING &AN 'RILLE Figure 1-6.
SECTION 1 DESCRIPTION Outer Plate Finger Manifold Assembly Inner Plate Baffle Figure 1-7. Air Finger.
SECTION 2 INSTALLATION SECTION 2 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.
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. I. UNLOADING Your Middleby Marshall PS724-Series Oven is shipped partially assembled. It will arrive in a carton on a crate. Carton size for a PS724-Series Oven is: NOTE 56.3″ (1422 mm) Long × There must be adequate clearance between the oven and any adjacent combustible construction.
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Figure 2-5.
Figure 2-6.
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SECTION 2 INSTALLATION UTILITY ROUGH-IN DIMENSIONS AND POSITIONING FOR PS724-SERIES OVENS WARNING /. DO NOT USE CONDUIT FOR GROUND CONNECTION. /&& 4O /VEN MM CAUTION IT IS RECOMMENDED THAT THE OVEN BE PLACED UNDER A VENTILATION HOOD FOR ADEQUATE AIR SUPPLY AND VENTILATION. /. /&& 4O /VEN MM ELECTRIC SUPPLY TO BE PROVIDED BY CUSTOMER Suggested dimensions shown; utility code 3UGGESTED DIMENSIONS AREare SHOWN UTILITY CODE requirements supersede factors shown.
SECTION 2 INSTALLATION III. ELECTRICAL CONNECTION INFORMATION FOR PS724-SERIES OVENS. IV. ELECTRIC SUPPLY 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, See Electrical Specifications chart on page 2. WARNING Authorized supplier personnel normally accomplish the connections for the ventilation system, electric and gas supplies, as arranged by the customer.
SECTION 3 OPERATION SECTION 3 OPERATION I. CONTROL FUNCTIONS 4EMPERATURE #ONTROLLER 3PEED #ONTROL -AIN "LOWER 3WITCH (EAT #ONVEYOR 3WITCH 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” 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 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. 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.
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). 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.
SECTION 3 OPERATION WARNING 4. Set the temperature controller to the desired baking temperature. 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/CONVEYOR switch (Figure 3-6) to the “ON” or “I” position. Wait for the “Heat ON” light to turn on. III. STEP-BY-STEP OPERATION A. Startup Procedures 6. Oven will reach a baking temperature of 500°F (232°C) in about 10 minutes.
SECTION 3 OPERATION (%!4 #/.6%9/2 Figure 3-6.
SECTION 3 OPERATION IV. NORMAL OPERATION - STEP-BY-STEP 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 10-12 minutes. 8. (Optional) Press the Tem- A.Daily Startup Procedure 1. Check that the circuit breaker/fused disconnect is in the on position. perature ( ) key to show the Actual Temperature in the display, and wait for the "ACTUAL TEMP" light to turn on.
SECTION 3 OPERATION Display "HEAT ON" Light Shows the Set Point or the Actual Temperature in degrees Fahrenheit (F) or Celsius (C). Lights when the burner is in 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" (setpoint) Light Lights when the set point is shown in the display. OVERTEMP Light "ACTUAL TEMP" Light Lights when the oven temperature is greater than 650°F (343°C).
SECTION 3 OPERATION V. QUICK REFERENCE: TROUBLESHOOTING SYMPTOM light is lit, food product is undercooked Oven will not turn on at all PROBLEM SOLUTION The oven temperature exceeded 650°F (343°C), and the burner was automatically 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.
SECTION 4 MAINTENANCE SECTION 4 MAINTENANCE WARNING Before ANY cleaning or servicing of the oven, perform the following procedure: 1. Switch off the oven and allow it to cool. Do NOT service the oven while it is warm. 2. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven. When all cleaning and servicing is complete: 1. If the oven was moved for servicing, return the oven to its original location. 2. Reconnect the electrical supply. 3.
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. When the oven is cool remove and clean the crumb pan at each end of the oven.
SECTION 4 MAINTENANCE You can order non-caustic cleaner from your local authorized Middleby Marshall Parts Distributor in the quantities listed below: 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. Part # When cleaning your Series PS724 Oven note the following: Quantity 27170-0244 Case of Quarts (6) 27170-0246 Case of Gallons (4) A.
SECTION 4 MAINTENANCE ,OOSEN 4WO 3CREWS AND 2EMOVE #HAIN 3PROCKET #OVER Figure 4-4. Figure 4-6. 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.
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; as viewed from the front of the oven. (The marks for an upper oven should be preceded with a “U”, example UB1, UT2, etc.) T1 T2 T3 B1 B2 B3 Standard Fingers 2. Remove 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. Keep your fingers clear so you won’t pinch them. Figure 4-11. Standard Lower Finger Figure 4-14. 4. Replace the air fingers by pushing in at the back side.
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.
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. Figure 4-17. 2EMOVABLE %ND 0LUG 5PPER 2EMOVABLE #ONVEYOR !SSEMBLY 4EMPERATURE #ONTROLLER 3PEED #ONTROL -AIN "LOWER 3WITCH (EAT #ONVEYOR 3WITCH 2EMOVABLE %ND 0LUG ,OWER #ASTERS Figure 4-18.
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. 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.
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 4-22. 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.
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″ set screw. 2. Push and hold conveyor end down to reinstall the chain. Figure 4-27. NOTE: The outside master links have right and left sides to them.
SECTION 4 MAINTENANCE 4. Reattach conveyor guard to control panel and secure two screws. IMPORTANT NOTICES: 5. Install both upper end plugs. • Installation of replacement parts requiring access to the interior of the oven is permitted only by an authorized service technician. 2EPLACE #HAIN 3PROCKET #OVER AND )NSERT AND 4IGHTEN 4WO 3CREWS • If there are any problems with the operation of the oven, the authorized service technician must be called.
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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 16 16 16 16 17 18 19 20 21 22 23 24 25 26 27 28 PART NO.
SECTION 4 MAINTENANCE NOTES 36
SECTION 5 TROUBLESHOOTING SECTION 5 TROUBLESHOOTING PROBLEM: PRODUCTS ARE OVERCOOKED OR UNDERCOOKED PROBLEM: OVEN BLOWER AND CONVEYOR OPERATE, YET THE OVEN IS NOT HEATING Check for correct setting of conveyor speed control. Check for correct setting on temperature controller. Reset the temperature controller to a new setting (above 200°F), after turning the BLOWER switch to off for 30 seconds. Set the conveyor speed control at correct setting. Turn temperature control to correct setting.
SECTION 5 TROUBLESHOOTING NOTES 38
SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, E208-240V, PS724E 61567B SECTION 6 ELECTRICAL SCHEMATICS 39
Wiring Diagram, E380V 17.
Wiring Diagram, E380V 17.
Wiring Diagram, 400-416V 4 kW, PS724E7 61534B SECTION 6 ELECTRICAL SCHEMATICS 42
SECTION 6 ELECTRICAL SCHEMATICS NOTES 43
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.
