Middleby Marshall PS570, PS360, PS200, PS555, PS220, PS224 PS310 manual 137, Inlet Pressure Check

Page 138

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kit 36863 - Gas Conversion Kit for PS360EWB/WB70 with Midco Burner, Propane to Natural Gas, 1/98

6. INLET PRESSURE CHECK

6.1Check the gas control inlet pressure at the inlet pressure tap. See Figure 6. An inlet pressure of 6-14” (14.9-34.9mbar) is recommended for natural gas operation.

6.2If the inlet pressure is:

•HIGHER THAN 14” W. C. (34.9mbar) - This pressure may damage the combination gas control valve. Decrease the supplied gas pressure.

•LOWER THAN 3” W. C. (7.46mbar) - It may be necessary to increase the supplied gas pressure.

If it is necessary to adjust the gas line pressure, have the customer contact the gas utility supplier.

7. PILOT PRESSURE ADJUSTMENT

7.1Ensure that the main burner primary air supply is properly adjusted for natural gas operation.

•Units with a burner blower air shutter (see Figure 5) should have the shutter opening (at its outside edge) set to 5/16” (7.94mm). A drill bit can be used to check the adjustment of this opening.

•Units without the air shutter (see Figure 5) should have the burner air supply adjustment screw turned 11-17 full revolutions clockwise from the fully closed (counterclockwise) position. The screw is located on the front wall of the burner plenum, and is surrounded by a “MORE AIR” label.

 

 

Figure 5

 

Insert a 5/16”

Burner blower configurations

Blowers without

 

 

(7.94mm) drill

 

 

external air shutter

bit to measure

 

 

 

 

 

opening

 

 

 

(remove before

 

 

 

operation)

External

 

 

 

 

 

air

OR

 

 

 

shutter

7.2Before proceeding:

•For a PS360EWB oven, the set point should be reduced below the room temperature.

•For a PS360WB70 oven, set the oven to low flame.

7.3Measure the pilot pressure as shown in Figure 6. The gas pressure should be 5-6” W. C. (12.5-14.9mbar) for proper operation.

7.4If necessary, adjust the pilot pressure as follows:

•Remove the pilot adjustment cap screw.

•Using a screwdriver, turn the inner adjustment screw counterclockwise to increase, or clockwise to decrease, the pilot gas pressure.

•Replace the cap screw and tighten it firmly.

7.5Measure the current across the pilot flame sensor. The current must measure at least 2.0 ∝ A. If the current reading is too low, recheck the pilot pressure as per Step 7.3. If the pressure reading is correct, consult the factory; otherwise, repeat Steps 7.4 and 7.5.

8. MAIN MANIFOLD PRESSURE ADJUSTMENT

8.1With the oven set to high flame, measure the regulated gas pressure to the burner. The outlet pressure should be checked at the main orifice pressure tap. See Figure 6. The gas pressure should be 3” W. C. (7.46mbar) for proper operation.

8.2If necessary, adjust the pressure regulator as follows:

Figure 6

Gas pressure measurement/adjustment locations

Pressure

Pilot tube

regulator cap

connects

screw

here

Inlet pressure

Pilot

adjustment

tap

cap screw

 

Main orifice

 

pressure tap

 

Pilot pressure

 

tap

•Remove the pressure regulator cap screw.

•Using a screwdriver, turn the inner adjustment screw clockwise to increase, or counterclockwise to decrease, the main burner gas pressure.

•Replace the cap screw and tighten it firmly.

8.3Record the final measured regulated gas pressure on the silver conversion information label (included in the kit).

p/n 36862

P. Jan. 98 Rev B

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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 II. Blowers and Blower Speed Blowers, belts and pulleysTypes of Heat Transfer PS200-series PS360-seriesCurrent standard air finger all oven models Air finger operationPS300/350 air finger with shutter plate III. AIR FingersConfiguration and Alignment 3D air finger label if presentPerforming a Test Bake PS300/350 Air Finger Shutter Adjustment Front-to-back uneven bakePS300/350-style air finger with adjustable shutter plate Do notBelt Time IV. Oven CapacityConveyor Speed and Bake Time Time of Delivery TODConveyor Speed Controller and Drive Motor Original-style speed controllerCurrent-style speed controller Part Number Reference Speed ControllersCurrent-style pickup assembly see Figures Preparing to Service the Speed ControllerPart Number Reference Pickup Assemblies Field Tester for Conveyor Drive Motor Current pickup assembly side viewCurrent pickup assembly End view 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 motorConveyor Control Pickup Test Conveyor Motor Test Unshielded Pickup Wires on Early PS360-series ovensConnections for pickup test Replacing the Magnetic PickupAppendices Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Servicing Components Application SubjectGeneral CompatibilityConveyor Speed Controller Kit for PS200R68-series ovens Bulletin No. MM-189 II. Temperature Controller 28071-0018 a Part Number Reference Temperature Controllers28071-0012 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 Part Number Reference High Limit Control Mod- ules Operation and TroubleshootingIII. High Limit Control Module 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 Part Number Reference Thermocouples TroubleshootingIV. 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 Blower motor fuses Early-style PS200 indirect drive assemblyCurrent PS200 indirect drive assembly BlowersBearing lubrication Blower belt tensionRepositioning the blower motor Fan shaft alignment tool Qty Part Number Description Four-point alignment test for correct pulley alignment Also available Blower motor fuses single-phase motors Blower motor fuses three-phase motorsPS360-series ovens Clockwise blower wheel Inlet ring Blower wheel puller toolPS570/570S blower configuration PS555/570-series ovensIntl. Tricon StandardPizza Hut 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 Part Number Reference Flame Gate PS570/570S flame gate adjustmentIX. PS570/570S Flame Gate Flame Gate OrientationGAS Train and Burner System PS200-series gas trainPS310, PS314, PS360 or PS360WB gas train 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 KitsComponent Identification Burner typeSolenoid valve vs. Modulating valve Pilot/Ignitor Assembly End of burner without flame target Showing pilot shieldFlame targets Voltage Flame structureFlame Rectification Gas PressurePilot Application Air shutter adjustmentTemperature Burner Blower MotorBurner Motor Relay Low Flame Bypass OrificeBurner Transformer High Flame Solenoid Valve if so equippedModulating Gas Valve if so equipped Burrs in pilot adjustment portal Combination Gas Control ValvePilot pressure Ignition Module Burner and Gas Train Troubleshooting 100Gas Conversion Kits Voltage Checks for Ignition Module Combination Gas Valve 101Combination Gas Valve Check Spark Ignition Circuit Component Checks Reset System After Lockout102 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 Pilot Orifice Replacement 131Preparation 132 Main Orifice ReplacementLOW Flame Orifice Replacement PS360WB70 only GAS Leak Test133 Pilot Pressure AdjustmentMain Manifold Pressure Adjustment Inlet Pressure CheckPropane 134Conversion Labeling 36856Propane to Natural Gas Installation Instructions 135136 137 138 Natural14 W.C./34.9mbar 139 XI. Electric Oven Heating System PS200 electric early with mercury Contactors and fuses140 Part No. DescriptionRemoving elements 141Individual element electrical data Electrical leads disconnected 142PS310/360-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 and brush axial fans Check and clean blow out machinery/control compartmentCheck and clean blow out main blower motors Check and clean igniter assembly173 174 Multiply To ObtainPressure conversion chart 175176 177 178 179 180
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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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