Middleby Marshall PS224 PS310 100, Gas Conversion Kits, Burner and Gas Train Troubleshooting

Page 101

SECTION 3 - SERVICING COMPONENTS

O. Gas Conversion Kits

Ovens can be converted from natural gas to propane opera- tion, or from propane to natural gas operation, by the instal- lation of the appropriate Gas Conversion Kit. Refer to Part Number Reference - Gas Orifices and Gas Conversion Kits on Page 91 for a listing of kit part numbers.

Converting the oven to operate on a different gas type gen- erally requires:

•Replacement of the regulator spring on the combina- tion gas control valve. The spring is located under- neath the pressure regulator screw. Note that on PS360EWB and PS360WB70 ovens equipped with the Midco burner, replacement of the regulator spring is not necessary.

•Replacement of the main orifice, pilot orifice, and by- pass orifice.Note that ovens equipped with the modu- lating gas system do not use a bypass orifice.

•Adjustment of the main and pilot gas pressures.

•Documenting the gas conversion using the labels and tags supplied in the kit.

Instructions for the gas conversion kits are provided in the Appendices section.

P. Burner and Gas Train Troubleshooting

1.Burner Blower Motor

If there is 110V (or 208/240V, as appropriate) to the motor terminals, it should be running. If the motor is not running, replace it.

2.Burner Blower Motor Centrifugal Switch (or air pressure safety switch)

If the burner blower motor is running at top speed, and you cannot measure 24V across the supply terminals of the ignition module, the centrifugal switch is not clos- ing properly and is either loose or defective.

For 120V burner blower motors with an internal cen- trifugal switch, tighten the switch. If this fails to correct the problem, replace the motor.

For 208/240V burner blower motors with a separate air pressure safety switch, refer to Air Pressure Safety Switch on Page 82 to troubleshoot the switch.

3.Relay

•Connect a voltmeter across the supply terminals on the relay. The reading should be 24V. If you do not get a 24V reading, the transformer should be replaced.

•lf 24V is present at the relay, and if after 15 to 45 sec- onds you do not get 110V (or 208/240V, as appropri- ate) on terminal 3 of the relay, replace the relay.

4.Main Gas Valve and Ignition Module

If 24V can be measured across the ignition module supply terminals, there should also be 24V between terminals PV and MV/PV on the gas control module.

If you have a 24V reading, the pilot valve should be open and the spark should be on to ignite the pilot gas. When the pilot gas has ignited, the main burner should ignite. If not, check MV terminal to ground and see if 24V is present. If no voltage is present, replace the ignition module.

It is possible to have a pilot on, but have the spark continue to try to light the pilot. If this continues for more than 30 seconds, then it should be assumed that the flame sensor is not working properly. This can be easily checked. Refer to Control Module Flame Sensor Test on the next page.

A reading of 2.0 mA or greater should be obtained. If a poor reading is obtained, the pilot flame and sensor are probably not making good contact. This will keep the main valve from opening. Refer to the section on flame rectification. If the microamp reading is good and 24V cannot be obtained at terminal MV then the ignition module should be replaced.

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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 Types of Heat Transfer Blowers, belts and pulleysII. Blowers and Blower Speed PS200-series PS360-seriesPS300/350 air finger with shutter plate Air finger operationCurrent standard air finger all oven models III. AIR FingersPerforming a Test Bake Configuration and Alignment3D air finger label if present Front-to-back uneven bake PS300/350 Air Finger Shutter AdjustmentDo not PS300/350-style air finger with adjustable shutter plateConveyor Speed and Bake Time IV. Oven CapacityBelt Time Time of Delivery TODCurrent-style speed controller Original-style speed controllerConveyor Speed Controller and Drive Motor Part Number Reference Speed ControllersPart Number Reference Pickup Assemblies Current-style pickup assembly see FiguresPreparing to Service the Speed Controller Current pickup assembly End view Current pickup assembly side viewField Tester for Conveyor Drive Motor Controller/Motor FailureIf 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 TroubleshootingConnections for pickup test Unshielded Pickup Wires on Early PS360-series ovensConveyor Control Pickup Test Conveyor Motor Test Replacing the Magnetic PickupAppendices Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components General SubjectApplication CompatibilityConveyor Speed Controller Kit for PS200R68-series ovens Bulletin No. MM-189 II. Temperature Controller 28071-0012 a Part Number Reference Temperature Controllers28071-0018 a 34983 BCOM 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 III. High Limit Control Module Operation and TroubleshootingPart Number Reference High Limit Control Mod- ules LocationHigh 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 IV. Thermocouples TroubleshootingPart 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 Current PS200 indirect drive assembly Early-style PS200 indirect drive assemblyBlower motor fuses BlowersRepositioning the blower motor Bearing lubricationBlower belt tension Fan shaft alignment tool Qty Part Number Description Four-point alignment test for correct pulley alignment Also available PS360-series ovens Blower motor fuses single-phase motorsBlower motor fuses three-phase motors Inlet ring Blower wheel puller tool Clockwise blower wheelPS555/570-series ovens PS570/570S blower configurationPizza Hut StandardIntl. Tricon Domino’s QPS500-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 IX. PS570/570S Flame Gate PS570/570S flame gate adjustmentPart Number Reference Flame Gate Flame Gate OrientationPS310, PS314, PS360 or PS360WB gas train PS200-series gas trainGAS Train and Burner System Part Number ReferencePS360EWB 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 viewSolenoid valve vs. Modulating valve Component IdentificationBurner type Flame targets Pilot/Ignitor AssemblyEnd of burner without flame target Showing pilot shield Flame Rectification Flame structureVoltage Gas PressureTemperature Air shutter adjustmentPilot Application Burner Blower MotorBurner Transformer Low Flame Bypass OrificeBurner Motor Relay High Flame Solenoid Valve if so equippedModulating Gas Valve if so equipped Pilot pressure Burrs in pilot adjustment portalCombination Gas Control Valve Ignition Module Gas Conversion Kits Burner and Gas Train Troubleshooting100 Combination Gas Valve Voltage Checks for Ignition Module Combination Gas Valve101 102 Component Checks Reset System After LockoutCheck Spark Ignition Circuit Check Spark Ignitor103 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 Preparation Pilot Orifice Replacement131 LOW Flame Orifice Replacement PS360WB70 only Main Orifice Replacement132 GAS Leak TestMain Manifold Pressure Adjustment Pilot Pressure Adjustment133 Inlet Pressure CheckConversion Labeling 134Propane 36856135 Propane to Natural Gas Installation Instructions136 137 14 W.C./34.9mbar 138Natural 139 140 PS200 electric early with mercury Contactors and fusesXI. Electric Oven Heating System Part No. DescriptionIndividual element electrical data Removing elements141 PS310/360-series ovens Electrical leads disconnected142 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 blow out main blower motors Check and clean blow out machinery/control compartmentCheck and clean blow out and brush axial fans Check and clean igniter assembly173 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.

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