Middleby Marshall PS528G - Manuals

SECTION 1 DESCRIPTION 1 I. MODEL IDENTIFICATION The Middleby Marshall PS528-Series may be used either as a single oven or stacked for use as double or triple ovens.A single PS528-Series Oven (Figure 1-1) is mounted on a base pad with legs. A double oven (Figure 1-2) consists of two, stacked, single ...

2 SECTION 1 DESCRIPTION PS528 SERIES OVEN SPECIFICATIONS Conveyor Belt Width 18.00" (457mm) Heating Zone Length 28.00" (711mm) Baking Area Square Feet 3.5 sq. ft. (0.33 sq. m.) Overall Dimension Standard Single Oven w/Legs 50.00" (1270mm) L × 40.75" (1035mm) W × 21.72" (786mm) H ...

4 SECTION 1 DESCRIPTION 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 dire...

6 SECTION 1 DESCRIPTION Figure 1-7. Blank Plates (two sizes) and an Air Finger. F2. Blank Plates 1. Blank Plates- The Blank Plates are available to install on the plenum where an air finger is not required.

SECTION 2 INSTALLATION 7 WARNING Keep the appliance area free and clear of combustibles. 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. Constructional changes to the area where the oven is install...

8 SECTION 2 INSTALLATION PARTS LIST FOR SERIES PS528 GAS OVEN INSTALLATION KIT Single Stack Oven P/N 63946 ITEM NO. QTY PART NO. DESCRIPTION 1 4 3101908 LEG 4 ″ AD FT 2 1 62208 INSULATION BOTTOM TRAY 3 1 62206 BOTTOM TRAY WELDMENT 4 1 61650 TOP COVER 5 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8 7 1...

SECTION 2 INSTALLATION 9 Figure 2-1 (continued). PS528-Series Gas Oven Installation Parts ITEM NO. QTY PART NO. DESCRIPTION 1 2 62208 INSULATION BOTTOM TRAY 2 1 62206 BOTTOM TRAY WELDMENT 3 1 61650 TOP COVER 4 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8 5 4 M3828 PIN, ALIGNMENT 7 1 22450-0228 GAS HO...

10 SECTION 2 INSTALLATION Figure 2-5. MODEL PS528 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. 1 1

SECTION 2 INSTALLATION 11 Figure 2-6. MODEL PS528 DOUBLE OVEN DIMENSIONS 1 The Opening Height is Adjustable from 2-1/4 inch mini- mum to 3-3/4 inch maximum in 1/2 inch increments. P/N 59927 is shown in its correct installed position. 1 2

12 SECTION 2 INSTALLATION Figure 2-7. MODEL PS528 TRIPLE OVEN DIMENSIONS 1 The Opening Height is Adjustable from 2-1/4 inch mini- mum to 3-3/4 inch maximum in 1/2 inch increments. P/N 59927 is shown in its correct installed position. 1 2

SECTION 2 INSTALLATION 13 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...

14 SECTION 2 INSTALLATION III. ELECTRICAL CONNECTION INFORMATION FOR PS528-SERIES OVENS. WARNING Authorized supplier personnel normally accom- plish the connections for the ventilation system, electric and gas supplies, as arranged by the customer. Following these connections, the factory-authorized...

SECTION 2 INSTALLATION 15 V. GAS SUPPLY CAUTION DURING PRESSURE TESTING NOTE THE FOLLOWING:1. The oven and its individual shutoff valve must be dis- connected from the gas supply piping system during any pressure testing of that system at test pressure in excess of 1/2 psi (3.45 kPa).2. The oven mus...

16 SECTION 2 INSTALLATION = G. Maintenance It is recommended to check yearly the minimum and the maximum setting and readjust them if necessary. H. Connection WARNING Some procedures in this section may require conversions, readjustments, or service on the oven's gas system. Before performing these ...

SECTION 3 OPERATION 19 SECTION 3 OPERATION I. 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...

20 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. CA...

SECTION 3 OPERATION 21 E. Conveyor The on-off switch for the conveyor motor is on the con- trol panel. Also on the control panel is the digital con- veyor speed control. The digital control can be adjusted f r o m 1 - 1 0 m i n . b a k e t i m e ( c o n v e y o r s p e e d ) . Refer to Figure 3-3.Co...

22 SECTION 3 OPERATION WARNING OVEN MUST BE KEPT CLEAR OF COMBUSTIBLES AT ALL TIMES. III. STEP-BY-STEP OPERATION A. Startup ProceduresDaily 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 thro...

24 SECTION 3 OPERATION 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 pro-cedure. IF THE OVEN WAS SWITCHED OFF FOR LESS THAN 5 MINUTES, WAIT FOR AT LEAST FIVE MINUTES BEFORE...

SECTION 3 OPERATION 25 Display Shows the Set Point or the Actual Tem- perature in degrees Fahrenheit (F) or Celsius (C). "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 temperatur...

26 SECTION 3 OPERATION V. QUICK REFERENCE: TROUBLESHOOTING SYMPTOM PROBLEM SOLUTION T h e o v e n t e m p e r a t u r e exceeded 650°F (343°C), a n d t h e b u r n e r w a s automatically shut down. • Follow the procedures under Daily Shutdown Procedures in this section to shut down the oven. Contac...

SECTION 4 MAINTENANCE 27 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 t...

28 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 T...

SECTION 4 MAINTENANCE 29 Figure 4-3. 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 PS528 Oven note the following: PRECAUTIONS - 1. Do not use exce...

30 SECTION 4 MAINTENANCE side.6. Remove conveyor as shown. Figure 4-6. Figure 4-7. CAUTION Be careful not to bump the drive sprocket while handling the conveyor, to avoid damaging the drive shaft. Figure 4-4. Figure 4-5.

SECTION 4 MAINTENANCE 31 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. Finge...

32 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. Figur...

SECTION 4 MAINTENANCE 33 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 gr...

34 SECTION 4 MAINTENANCE 5. Install fingers and blank plates correctly with edges interlocked and no space between edges. Figure 4-18. Top Finger Incorrect - Too Much Space Blank Plate Tab on Outer Plate of Finger Located in Groove Top Finger Incorrect - Too Much Space Blank Plate Tab on Outer Plate...

SECTION 4 MAINTENANCE 35 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.

36 SECTION 4 MAINTENANCE 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 ...

38 SECTION 4 MAINTENANCE 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...

SECTION 4 MAINTENANCE 39 4. Reattach conveyor guard to control panel and secure two screws.Install both upper end plugs. Figure 4-34. III. MAINTENANCE - EVERY 3 MONTHS WARNING Shut OFF all electrical power and lock/tag out the switch before attempting maintenance work. NOTE: It is recommended that t...

40 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 dow...

41 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. Check for correct setting on tempera- ture controller. Turn temperature control to correct se...

43 SECTION 6 ELECTRICAL SCHEMATICS SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, G208-240 50/60 GO, PS528G • P/N 62317 REV B

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