Middleby Marshall PS520-Series Electric Ovens: English ® A MIDDLEBY COMPANY owner's operating & installation manual PS520-Series OVENS Model PS520E PS520 (Double) ©2003 Middleby Marshall Inc. PS520 (Single) PS520 (Triple) Part No. 52358 Price $30.00 P: 08/08 Rev.
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.
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 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 .........
SECTION 1 DESCRIPTION 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, single ovens. A triple oven (Figure 1-3) 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.
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 × 35.21″ (894mm) W × 21.72″ (786mm) H × Overall Dimension Double Oven 42.00″ (1067mm) L × 35.21″ (894mm) W × 37.27″ (947mm) H x Overall Dimension Triple Oven 42.00″ (1067mm) L x 35.21″ (894mm) W × 52.82″ (1342mm) H × Weight of Single Oven 250 lb (93.
SECTION 1 DESCRIPTION Figure 1-4.
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.
SECTION 1 DESCRIPTION Figure 1-6.
SECTION 1 DESCRIPTION F2. Blank Plates 1. Blank Plates- The Blank Plates are available to install on the plenum where an air finger is not required. Half Blank Plate 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. I. UNLOADING Your Middleby Marshall PS520-Series Oven is shipped partially assembled. It will arrive in a carton on a crate.
SECTION 2 INSTALLATION PARTS LIST FOR SERIES PS520 ELECTRIC OVEN INSTALLATION KIT Single and Double Stack Ovens P/N 48397 ITEM NO. QTY PART NO. 1 2 3 4 5 4 2 1 1 4 3101908 48392 48394 48396 51387 6 1 52358 DESCRIPTION LEG 4″ AD FT INSULATION BOTTOM TRAY BOTTOM TRAY WELDMENT TOP COVER SCREW MSSLT THREAD 8-32 × 1/2, 18-8 OWNER'S OPERATING & INSTALLATION MANUAL PARTS LIST FOR SERIES PS520 ELECTRIC OVEN INSTALLATION KIT Triple Stack Oven P/N 54593 ITEM NO. QTY PART NO.
SECTION 2 INSTALLATION Figure 2-5. MODEL PS520 SINGLE OVEN DIMENSIONS 1 1 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 1 1 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 1 1 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 Figure 2-9. Typical PS520-Series Oven(s) Installation Separate circuit breaker with lockout/tagout electrical shutoff for each oven. Wire each oven separately. ELECTRICAL RATING 7.
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.
SECTION 2 INSTALLATION NOTES 14
SECTION 3 OPERATION SECTION 3 OPERATION I. CONTROL FUNCTIONS 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 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 C. Heat 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.
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 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.
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 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 6.
SECTION 3 OPERATION 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 15 minutes. 8. (Optional) Press the Tem- 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. 4. 5. 6.
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 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 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 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.
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 II. MAINTENANCE - MONTHLY the aluminized finger manifold surfaces. 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.
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.
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 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. Figure 4-9. 4.
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.
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 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 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 Completely Top Finger Blank Plate Tab on Outer Plate of Finger Located in Groove Figure 4-18.
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.
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 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. Oven conveyor belt must be cool when adjusting belt. Do not adjust belt if HOT. 1.
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.
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.
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 screws from the control cabinet door. Tighten all electrical 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.
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 production, if a failure occurs. Replacement parts for this kit can be purchased from your Middleby Marshall Authorized Parts Distributor.
SECTION 5 TROUBLESHOOTING SECTION 5 TROUBLESHOOTING PROBLEM: OVEN BLOWER AND CONVEYOR OPERATE, YET THE OVEN IS NOT HEATING PROBLEM: PRODUCTS ARE OVERCOOKED OR UNDERCOOKED 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 PARTS LIST ENGLISH SECTION 6 - PARTS LIST 39
SECTION 6 PARTS LIST ENGLISH 40
QTY 1 1 1 1 1 1 4 8 6 4 1 1 4 1 1 1 ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 41 14 15 16 47862 45739 M10434 51387 48396 48395 3101908 36452 21296-0005 51398 48410 48378 48412 48408 48387 48382 PART NO. ASSY, COVER, MOTOR NAMEPLATE, MM CORDSET, 50 AMP 250V 2P 3W (208/240 V MODELS ONLY) SCR, MS, SLT TRHD 8-32X1/2 18-8 COVER, TOP BOTTOM TRAY ASSEMBLY LEG, 4” ADJ FT (NPS) NUT, WING-PLASTIC 1/4-20 SCREW, HEX HEAD, WSHHD 12-14X3/4 SS BSD END PLUG MOUNTING BRACKET ASSEMBLY .
SECTION 6 PARTS LIST ENGLISH 42
QTY 1 1 1 1 1 1 1 1 1 1 1 1 ITEM 1 2 3 4 4 4 4 5 6 7 8 9 22450-0297 50610 M10434 3003946 57408 50715 51017 51958 51961 51402 28021-0047 33812-5 PART NO. TUBING, SILICONE, 27" SWITCH, AIR 0.16 IN.
SECTION 6 PARTS LIST ENGLISH 44
QTY 1 2 1 2 2 4 1 1 3 1 ITEM 1 2 3 4 5 6 7 8 9 10 22450-0297 57476 57474 31497 7007413 57258 52244 51399 30927 28021-0061 PART NO.
SECTION 6 PARTS LIST ENGLISH 46
QTY 3 3 3 1 1 1 1 1 1 1 1 1 1 2 1 1 ITEM I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 47 16 33812-5 48635 45036 35145 50163 58500 33983 28021-0047 31504 28041-0011 50990 37503 60542 44696 44697 46521 PART NO. THERMOCOUPLE, TYPE “J”, SHIELDED, 2.50X1 20” BREAKER, CIRCUIT 240V, 0.
SECTION 6 PARTS LIST ENGLISH 48
OTY 1 4 1 1 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 ITEM 1 2 3 4 5 6 7 8 9 10 10A 10B 11 12 13 49 14 15 16 17 18 19 51409 48469 51296 51297 30153 50163 58500 45349 55217 55567 3101212 55566 50061 50062 50060 M7471 M4818 51408 M4815 M4817 48471 PART NO.
SECTION 6 PARTS LIST NOTES ENGLISH 50
SECTION 7 ELECTRICAL SCHEMATICS Wiring Diagram, E208-240 50/60/1, PS520 SECTION 7 ELECTRICAL SCHEMATICS 51
Wiring Diagram, E380-480V 50/60/1, PS520 SECTION 7 ELECTRICAL SCHEMATICS 52
Wiring Diagram, E230-240V CE PS520/1820S SECTION 7 ELECTRICAL SCHEMATICS 53
Wiring Diagram, E380-400V CE PS520/1820S SECTION 7 ELECTRICAL SCHEMATICS 54
SECTION 7 ELECTRICAL SCHEMATICS NOTES 55
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.
