Middleby Marshall PS220, PS570, PS360, PS200, PS555, PS224 PS310 manual Servicing Components

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SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kits 33984 and 33985 -

Oven Thermocouple Kit, 11/01

PS570 (X01-X05 name plate ID numbers) and PS570S (early) with side-mounted thermo- couples inside or outside the blower motor compartments

These ovens are equipped with two thermocouples, one on each end wall of the oven. The thermocouples may be mounted either inside or outside of the blower motor com- partments.

•The thermocouple on the right side of the oven has two leads and sends its signal to the temperature controller.

•The thermocouple on the left side of the oven is a dual- function unit. It has FOUR LEADS and sends indi- vidual signals to the temperature controller and the high limit control module.

Installing this Kit will replace BOTH thermocouples with current three-lead versions located on the back wall of the oven. The Kit also requires the installation of a THIRD ther- mocouple to act as a high limit sensor. Because of this, you will need three separate thermocouple kits for these ovens.

If the oven has already been updated with the rear-wall ther- mocouple configuration, you can simply replace the affected thermocouple. Follow the instructions for PS570S (late) rear wall thermocouples on Page 10.

1.If the thermocouples are located outside the blower motor compartments, remove and retain the thermo- couple covers.

2.Remove the end plugs from the oven. Then, remove 1 or 2 air fingers from each end of the oven as necessary to access the thermocouple mounting tubes.

3.Remove the rear shrouds. Open the blower motor com- partment doors.

4.Remove the cooling fans from both blower motors. Then, remove the blower belts.

5.For each thermocouple:

•Disconnect the thermocouple leads from the ter- minal block inside the blower motor compartment.

•Remove and discard the screws that hold the ther- mocouple mounting tube to the plenum wall. Re- move and discard the thermocouple and tube.

•Plug the internal and external openings left by the tubes using a high-temperature silicone sealant.

6.If the thermocouples were located outside the blower motor compartments, replace the thermocouple cov- ers.

7.Refer to Figure 11. Measure and scribe marks in the rear wall of the oven for drilling the thermocouple mount- ing holes. Make sure that your measurements begin at the edges of the rear panels, and NOT at the outer edges of the oven!

Note that there are two different thermocouple placement locations: one for Pizza Hut (and Pizza Hut International, or Tricon) ovens, and one for all other ovens.

8.Drill the new thermocouple mounting holes using an 11/32” (8.73mm) D x 8” (203mm) L bit. Make sure that you drill through all three walls of the oven.

9.Drill the two screw mounting holes for each thermo- couple using a 7/64” (2.78mm) bit. Tap the holes using a #6-32 tap.

10.If necessary, remove air fingers from the oven to ac- cess the areas around the new thermocouple mount- ing holes.

11.Vacuum out ALL drill shavings. If the oven is equipped with a screen over the openings for the lower air fin- gers, use a flexible hose extension on the vacuum to reach the shavings through the upper air finger open- ings.

12.Reinstall the air fingers and end plugs onto the oven.

13.Install the three new thermocouples into the back wall of the oven. Check that the thermocouple flanges are flush with the back wall.

14.Secure each thermocouple in place with the two kit- supplied #6 x 3/8” screws.

15.Wire the thermocouples as shown in Figure 12. The thermocouples should be wired to the terminal block inside the blower motor compartment closest to the thermocouple.

IMPORTANT

As you wire the thermocouples, be sure to connect a single chassis ground wire to the mounting screw for the terminal block. See Figure 12.

A good ground connection for the thermocouple’s uninsulated lead is REQUIRED for proper operation!

16.If you will be replacing additional thermocouples, re- peat Steps 7-15 as necessary.

17.Using the kit-supplied nylon clamps and #10-16 x 3/4” screws, secure the thermocouple leads to the back wall of the oven so that they will clear the shrouds, blower belts, and pulleys.

18.Replace the blower belts and cooling fans.

19.Close the blower motor compartment doors. Replace all shrouds onto the oven.

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Contents Page Technical service Manual Middleby Marshall, IncTable of Contents Table of Contents Section Sequence of Operation GAS Oven Sequence of OperationSequence of Operation Sequence of Operation Blowers, belts and pulleys Types of Heat TransferII. Blowers and Blower Speed PS200-series PS360-seriesAir finger operation PS300/350 air finger with shutter plateCurrent standard air finger all oven models III. AIR Fingers3D air finger label if present Configuration and AlignmentPerforming a Test Bake PS300/350 Air Finger Shutter Adjustment Front-to-back uneven bakePS300/350-style air finger with adjustable shutter plate Do notIV. Oven Capacity Conveyor Speed and Bake TimeBelt Time Time of Delivery TODOriginal-style speed controller Current-style speed controllerConveyor Speed Controller and Drive Motor Part Number Reference Speed ControllersPreparing to Service the Speed Controller Current-style pickup assembly see FiguresPart Number Reference Pickup Assemblies Current pickup assembly side view Current pickup assembly End viewField Tester for Conveyor Drive Motor Controller/Motor FailureBasic Troubleshooting Flowcharts If the Gear Motor Runs AT Full SpeedIf the Gear Motor will not RUN AT ALL Initial Troubleshooting Check the magnetic pickup on the motorUnshielded Pickup Wires on Early PS360-series ovens Connections for pickup testConveyor Control Pickup Test Conveyor Motor Test Replacing the Magnetic PickupAppendices Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Subject GeneralApplication CompatibilityConveyor Speed Controller Kit for PS200R68-series ovens Bulletin No. MM-189 II. Temperature Controller Part Number Reference Temperature Controllers 28071-0012 a28071-0018 a 34983 BDescription COMDigital 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 Operation and Troubleshooting III. High Limit Control ModulePart Number Reference High Limit Control Mod- ules LocationAppendix Instructions for Service Kit High Limit Conversion Kit for PS300, 310, 350, & 360 OvensInstallation Not to Scale For Ovens with a Digital Temperature Controller For Ovens with an Analog Temperature ControllerTesting the Installation Ovens with a cooldown feature Replacement United Electric ModelOvens without a cooldown feature Replacement Middleby Corporation Service Hotline Troubleshooting IV. ThermocouplesPart Number Reference Thermocouples Thermocouple FunctionsServicing 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 Early-style PS200 indirect drive assembly Current PS200 indirect drive assemblyBlower motor fuses BlowersBlower 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 Clockwise blower wheel Inlet ring Blower wheel puller toolPS570/570S blower configuration PS555/570-series ovensStandard Pizza HutIntl. Tricon Domino’s QPS500-series blower wheel orientation Bearing replacement and alignment Blower belt tension Repositioning the blower motorVI. Blower Motor Centrifugal Safety Switch PS360-SERIES Part Number Reference Blower Centrifugal SwitchAir pressure safety switch models PS360WB70/EWB with Midco burner PS360WB70/EWB with Wayne burnerServicing Components Servicing Components Servicing Components Servicing Components PS570/570S flame gate adjustment IX. PS570/570S Flame GatePart Number Reference Flame Gate Flame Gate OrientationPS200-series gas train PS310, PS314, PS360 or PS360WB gas trainGAS Train and Burner System Part Number ReferencePS360EWB or PS360WB70 gas train with Midco burner PS360EWB or PS360WB70 gas train with Wayne burnerPS570S gas train PS570G or PS555 gas trainWayne burner exploded view Part Number Reference Gas Orifices and Gas Conversion KitsBurner type Component IdentificationSolenoid valve vs. Modulating valve End of burner without flame target Showing pilot shield Pilot/Ignitor AssemblyFlame targets Flame structure Flame RectificationVoltage Gas PressureAir shutter adjustment TemperaturePilot Application Burner Blower MotorLow Flame Bypass Orifice Burner TransformerBurner Motor Relay High Flame Solenoid Valve if so equippedModulating 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 Component Checks Reset System After Lockout 102Check Spark Ignition Circuit Check Spark IgnitorTroubleshooting Flowcharts 103104 105 106 107 Appendix Instructions for Service Kit 30185 Pilot Tee, 3/94 108109 110 111 112 113 114 115 Appendix Instructions for Service Kit Ignition Module, 11/90 116117 118 119 Appendix Instructions for All Gas Conversion KitsEnglish 120Preparation and Disassembly 121122 IV. Pilot Orifice Conversion123 VII. GAS Leak Test VIII. Inlet Pressure CheckManifold Pressure Adjustment 124125 For Ovens with Wayne Burner, Propane to Natural Gas, 8/00126 127 NUTS.3128 IX. Pilot Pressure Adjustment 129130 131 Pilot Orifice ReplacementPreparation Main Orifice Replacement LOW Flame Orifice Replacement PS360WB70 only132 GAS Leak TestPilot Pressure Adjustment Main Manifold Pressure Adjustment133 Inlet Pressure Check134 Conversion LabelingPropane 36856Propane to Natural Gas Installation Instructions 135136 137 Natural 13814 W.C./34.9mbar 139 PS200 electric early with mercury Contactors and fuses 140XI. Electric Oven Heating System Part No. Description141 Removing elementsIndividual element electrical data 142 Electrical leads disconnectedPS310/360-series ovens Element bank removed spacer bracket visible 143144 PS555 ovensPS555 electric oven heating element removal 145Mercury Contactor Replacement 146147 148 Component Wiring 149150 151 II. PS200-SERIES Ovens152 153 154 155 156 157 158 159 III. PS360-SERIES Ovens Electrical Wiring Diagrams 160161 162 163 164 165 III. PS555/570-SERIES Ovens Electrical Wiring Diagrams 166167 168 169 170 171 Check and clean blow out machinery/control compartment Check and clean blow out main blower motorsCheck and clean blow out and brush axial fans Check and clean igniter assembly173 174 Multiply To ObtainPressure conversion chart 175176 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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