Middleby Marshall PS360, PS570, PS200, PS555, PS220, PS224 PS310 manual II. Temperature Controller

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SECTION 3 - SERVICING COMPONENTS

Appendix - DIP switch settings for Conveyor Speed Controller

with Digital Display (P/N 37337), 4/02

II. TEMPERATURE CONTROLLER

The Temperature Controller is used to set and control the oven temperature. Depending on the oven, model, the con- troller has several functions:

•On gas ovens with On-Off gas valve operation, the tem- perature controller opens and closes the high flame solenoid. This allows 100% or 0% gas flow to the burner in response for the need for heat to maintain the set point temperature. The temperature controller has no effect on the low flame bypass or oven ignition.

For this operating mode, the temperature controller is set to the On-Off Mode as described in the Kit instructions.

•On gas ovens with modulated gas valve (PID) opera- tion, the temperature controller sends a signal to the amplifier board which in turn controls the operation of the modulating valve. This allows a modulated gas flow of any necessary value from 0-100% in response for the need for heat to maintain the set point. The tem- perature controller has no effect on oven ignition.

For this operating mode, the temperature controller is set to the PID Mode as described in the Kit instructions.

•On electric ovens with On-Off heater activation (includ- ing most PS200-series and PS360-series electric ov- ens), the temperature controller permits or cuts power to the heating elements as necessary to maintain the set point temperature.

•

•

•

For this operating mode, the temperature controller is set to the On-Off Mode as described in the Kit instructions.

On electric ovens with variable pulse heater activation (including PS555 electric ovens), the temperature con- troller sends its signal to a controller module that con- tains an amplifier board and two solid state relays. The relays activate the heating elements at 100% power on a fixed cycle time, for a length of time proportional to the signal from the temperature controller.

For this operating mode, the temperature controller is set to the PID Mode as described in the Kit instructions.

Note that temperature controller P/N 46837 (inc. with Service Kit 47321) includes a dedi- cated variable pulse mode intended for the PS536 electric oven. This special mode is NOT used on the PS555.

The temperature controller regulates the cooldown func- tion. NOTE: PS200VL-series ovens do not include a cooldown function.

On most PS200-series and PS300-series gas ovens (except the PS200VL), the temperature controller moni- tors the high limit. All other oven models use a High Limit Control Module that is independent of the tem- perature controller.

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Contents Page Middleby Marshall, Inc Technical service ManualTable of Contents Table of Contents GAS Oven Sequence of Operation Section Sequence of OperationSequence of Operation Sequence of Operation PS200-series PS360-series Blowers, belts and pulleysTypes of Heat Transfer II. Blowers and Blower SpeedIII. AIR Fingers Air finger operationPS300/350 air finger with shutter plate Current standard air finger all oven models3D air finger label if present Configuration and AlignmentPerforming a Test Bake Front-to-back uneven bake PS300/350 Air Finger Shutter AdjustmentDo not PS300/350-style air finger with adjustable shutter plateTime of Delivery TOD IV. Oven CapacityConveyor Speed and Bake Time Belt TimePart Number Reference Speed Controllers Original-style speed controllerCurrent-style speed controller Conveyor Speed Controller and Drive MotorPreparing to Service the Speed Controller Current-style pickup assembly see FiguresPart Number Reference Pickup Assemblies Controller/Motor Failure Current pickup assembly side viewCurrent pickup assembly End view Field Tester for Conveyor Drive MotorIf the Gear Motor Runs AT Full Speed Basic Troubleshooting FlowchartsIf the Gear Motor will not RUN AT ALL Check the magnetic pickup on the motor Initial TroubleshootingReplacing the Magnetic Pickup Unshielded Pickup Wires on Early PS360-series ovensConnections for pickup test Conveyor Control Pickup Test Conveyor Motor TestAppendices Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Compatibility SubjectGeneral ApplicationConveyor Speed Controller Kit for PS200R68-series ovens Bulletin No. MM-189 II. Temperature Controller 34983 B Part Number Reference Temperature Controllers28071-0012 a 28071-0018 aCOM DescriptionDigital Temperature Controller Controller Types Before you Begin Electrical Connections Variable Pulse Output System Jumper Setting Temperature Diagnostic Error Messages Digital Temperature Controller Operating Instructions Middleby Corporation Service Hotline Servicing Components Servicing Components Location Operation and TroubleshootingIII. High Limit Control Module Part Number Reference High Limit Control Mod- ulesHigh Limit Conversion Kit for PS300, 310, 350, & 360 Ovens Appendix Instructions for Service KitInstallation Not to Scale For Ovens with an Analog Temperature Controller For Ovens with a Digital Temperature ControllerTesting the Installation United Electric Model Ovens with a cooldown feature ReplacementOvens without a cooldown feature Replacement Middleby Corporation Service Hotline Thermocouple Functions TroubleshootingIV. Thermocouples Part Number Reference ThermocouplesServicing Components Oven Thermocouple Kit PS200 Series before 2/96, serial numbers before ASH-0001 Thermocouple Wiring PS360 Series Analog Temperature Controller Digital PS536 Thermocouple Wiring PS555 PS555 Electric and PS555E Servicing Components High limit thermocouple High limit thermocouple Position for ovens with Thermocouple Wiring PS570S Late Left to Right Conveyor Thermocouple Wiring PS555G and PS570G Blowers Early-style PS200 indirect drive assemblyCurrent PS200 indirect drive assembly Blower motor fusesBlower belt tension Bearing lubricationRepositioning the blower motor Fan shaft alignment tool Qty Part Number Description Four-point alignment test for correct pulley alignment Also available Blower motor fuses three-phase motors Blower motor fuses single-phase motorsPS360-series ovens Inlet ring Blower wheel puller tool Clockwise blower wheelPS555/570-series ovens PS570/570S blower configurationDomino’s Q StandardPizza Hut Intl. TriconPS500-series blower wheel orientation Blower belt tension Repositioning the blower motor Bearing replacement and alignmentPart Number Reference Blower Centrifugal Switch VI. Blower Motor Centrifugal Safety Switch PS360-SERIESAir pressure safety switch models PS360WB70/EWB with Wayne burner PS360WB70/EWB with Midco burnerServicing Components Servicing Components Servicing Components Servicing Components Flame Gate Orientation PS570/570S flame gate adjustmentIX. PS570/570S Flame Gate Part Number Reference Flame GatePart Number Reference PS200-series gas trainPS310, PS314, PS360 or PS360WB gas train GAS Train and Burner SystemPS360EWB or PS360WB70 gas train with Wayne burner PS360EWB or PS360WB70 gas train with Midco burnerPS570G or PS555 gas train PS570S gas trainPart Number Reference Gas Orifices and Gas Conversion Kits Wayne burner exploded viewBurner type Component IdentificationSolenoid valve vs. Modulating valve End of burner without flame target Showing pilot shield Pilot/Ignitor AssemblyFlame targets Gas Pressure Flame structureFlame Rectification VoltageBurner Blower Motor Air shutter adjustmentTemperature Pilot ApplicationHigh Flame Solenoid Valve if so equipped Low Flame Bypass OrificeBurner Transformer Burner Motor RelayModulating Gas Valve if so equipped Combination Gas Control Valve Burrs in pilot adjustment portalPilot pressure Ignition Module 100 Burner and Gas Train TroubleshootingGas Conversion Kits 101 Voltage Checks for Ignition Module Combination Gas ValveCombination Gas Valve Check Spark Ignitor Component Checks Reset System After Lockout102 Check Spark Ignition Circuit103 Troubleshooting Flowcharts104 105 106 107 108 Appendix Instructions for Service Kit 30185 Pilot Tee, 3/94109 110 111 112 113 114 115 116 Appendix Instructions for Service Kit Ignition Module, 11/90117 118 Appendix Instructions for All Gas Conversion Kits 119120 English121 Preparation and DisassemblyIV. Pilot Orifice Conversion 122VII. GAS Leak Test VIII. Inlet Pressure Check 123124 Manifold Pressure AdjustmentFor Ovens with Wayne Burner, Propane to Natural Gas, 8/00 125126 NUTS.3 127128 129 IX. Pilot Pressure Adjustment130 131 Pilot Orifice ReplacementPreparation GAS Leak Test Main Orifice ReplacementLOW Flame Orifice Replacement PS360WB70 only 132Inlet Pressure Check Pilot Pressure AdjustmentMain Manifold Pressure Adjustment 13336856 134Conversion Labeling Propane135 Propane to Natural Gas Installation Instructions136 137 Natural 13814 W.C./34.9mbar 139 Part No. Description PS200 electric early with mercury Contactors and fuses140 XI. Electric Oven Heating System141 Removing elementsIndividual element electrical data 142 Electrical leads disconnectedPS310/360-series ovens 143 Element bank removed spacer bracket visiblePS555 ovens 144145 PS555 electric oven heating element removal146 Mercury Contactor Replacement147 148 149 Component Wiring150 II. PS200-SERIES Ovens 151152 153 154 155 156 157 158 159 160 III. PS360-SERIES Ovens Electrical Wiring Diagrams161 162 163 164 165 166 III. PS555/570-SERIES Ovens Electrical Wiring Diagrams167 168 169 170 171 Check and clean igniter assembly Check and clean blow out machinery/control compartmentCheck and clean blow out main blower motors Check and clean blow out and brush axial fans173 Multiply To Obtain 174175 Pressure conversion chart176 177 178 179 180
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PS224 PS310, PS220, PS555, PS200, PS360 specifications

The Middleby Marshall PS555 is a standout commercial pizza oven renowned for its performance, efficiency, and advanced technologies. Designed with the modern pizzeria in mind, the PS555 delivers exceptional cooking results while maximizing energy efficiency and throughput.

One of the key features of the PS555 is its innovative cooking technology, which incorporates both convection and radiant heat. This unique combination ensures that pizzas are cooked evenly and quickly, achieving a perfectly crispy crust and evenly melted cheese every time. The oven’s high-speed air impingement system accelerates cooking times, allowing pizzerias to serve more customers in less time without compromising quality.

The PS555 is designed with a spacious cooking chamber that can accommodate multiple pizzas simultaneously. With its ability to fit pizzas up to 18 inches in diameter, the oven is ideal for establishments with high demand. Additionally, the adjustable conveyor speed allows operators to customize the cooking time based on their specific menu items, enhancing versatility and productivity.

Energy efficiency is a hallmark of the Middleby Marshall PS555. The oven utilizes advanced insulation materials to minimize heat loss, ensuring that it operates at optimal temperatures while consuming less energy. This efficiency not only reduces operating costs but also contributes to a more sustainable kitchen environment.

User-friendly controls make it simple for operators to manage the cooking process. The PS555 features digital controls with programmable settings, enabling quick adjustments to temperature and cooking time. This ensures consistent quality across different shifts and helps maintain product standards while simplifying staff training.

Durability is another defining characteristic of the PS555. Built with high-quality materials, the oven is designed for heavy use in busy commercial kitchens. Its stainless steel construction ensures resistance to wear and tear, making it a worthwhile investment for any pizzeria.

In summary, the Middleby Marshall PS555 pizza oven is a high-performance piece of equipment that combines advanced cooking technologies, efficiency, and durability. Its ability to deliver consistently excellent results while streamlining operations makes it an essential asset for any pizza business aiming to enhance its productivity and customer satisfaction.
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