Middleby Marshall PS536-Series II. Principle of AIR Flow, Heat Transfer and How It Works

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SECTION 1

DESCRIPTION

II. PRINCIPLE OF AIR FLOW

The fan-style blower draws air into the oven plenum where it is heated. The blower then pushes the hot air through the air fingers into the baking chamber. Each air finger contains an inner plate and outer plate that form the hot air into jets, distributing it across a conveyor belt on which the food product rides. Air is then pulled back into the blower and the process continues. The curving, black arrows of Figure 1-4 show this air flow.

A. Heat Transfer and How It Works

1.Heat constantly moves from a warm object to a cold object. Heat moves using three different paths: Conduc- tion; Radiation; and Convection.

Conduction: This path utilizes surface-to-surface con- tact. The pizza dough in contact with the pan is a good example of conduction.

Radiation: This path has to do with objects radiating heat. Dark objects absorb heat whereas light or shiny objects reflect more heat. This is the reason that the inside of a

PS536ES-Series Oven is light in color: To reflect more heat back onto the food product.

Convection: This path has to do with moving a volume of air. It explains why hot air rises and cooler air replaces hot air. An industrial application of this principle is to incorpo- rate a fan to force the hot air movement, which in turn increases the heat transfer to the food product.

Each PS536ES-Series Oven has a large fan-style blower to move the hot air through the air fingers and onto the product to cook/bake the food product most efficiently.

2.Temperature is the intensity of heat at the point where it is sensed. As discussed above, heat flows by conduc- tion, radiation and convection. The speed at which the heat flows is determined by the temperature difference between the oven and the food product. The larger the difference, the faster the heat flows to the item that is being baked.

Upper Air Fingers

 

Conveyor Belt(s)

 

Window

Lower Air Fingers

Figure 1-4. PS536ES-Series Oven Air Flow

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Contents Owners operating Page Iii Middleby Marshall Table of Contents Model Identification Section DescriptionGeneral specifications per oven cavity PS536ES Series Oven SpecificationsSeries PS536ES Electrical Specifications DimensionsHeat Transfer and How It Works II. Principle of AIR FlowAir Fingers II. Principle of AIR FlowIII. Component Function Figure PS536ES-Series Oven Components LocationsIII. Component Function Cooling Fan F2. Blank Plates Blank Plates two sizes and an Air FingerUnloading Section InstallationInstallation PS536ES Oven Installation Required Kits and EquipmentInstallation KIT see Figure Model PS536ES Single Oven Dimensions Model PS536ES Double Oven Dimensions Model PS536ES Triple Oven Dimensions Restraint Cable InstallationInstallation II. Ventilation Guidelines 11. Typical Electric Oven Data Plate IV. Electric Supply for Electrically Heated Ovens13. Installing Rear and End Stops VI. Conveyor Rear Stop and END Stop InstallationControl Functions Section OperationII. Component Information and Location Figures 3-1 Conveyor Measuring Conveyor SpeedSee Figures 3-4 III. STEP-BY-STEP Operation Startup Procedures Daily StartupPower Failure Shutdown ProcedureLocation and Description of Controls II. Normal Operation STEP-BY-STEP III. Quick Reference Digital Temperature Controller Symptom IV. Quick Reference TroubleshootingSection Maintenance Crumb Pans Figure Maintenance DailyExterior Cooling FanII. Maintenance Monthly Section Maintenance Standard Fingers Air Fingers Disassembly For CleaningReassembly of Air Fingers Cleaning the WindowBack in the same way they came out Section Maintenance Reinstall End Plugs Checking Conveyor Belt Tension Conveyor Reassembly Into OvenConveyor Belt Link Removal Attaching Drive Chain Replacing Conveyor BeltLower End Plug Cleaning the Blower/Fan Motor III. Maintenance Every 3 MonthsVentilation Electrical TerminalsSplit-belt Conveyor Shaft Cleaning Section Maintenance Important Notices IV. Maintenance Every 6 MonthsKEY Spare Parts KIT Section Troubleshooting Section Troubleshooting Parts List Parts List QTY Description Oven PANELS, Window and LegsParts List English Parts List Blower and Shroud Parts List Item QTY Conveyor Description ConveyorParts List Split Belt Conveyor Element Machinery Compartment Section Parts List Electrical Electrical Section Schematics Electrical Schematics Section Hour Service Hotline
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