Page
Technical service Manual
Middleby Marshall, Inc
Table of Contents
Table of Contents
Section Sequence of Operation
GAS Oven Sequence of Operation
Sequence of Operation
Sequence of Operation
Blowers, belts and pulleys
Types of Heat Transfer
II. Blowers and Blower Speed
PS200-series PS360-series
Air finger operation
PS300/350 air finger with shutter plate
Current standard air finger all oven models
III. AIR Fingers
Configuration and Alignment
3D air finger label if present
Performing a Test Bake
PS300/350 Air Finger Shutter Adjustment
Front-to-back uneven bake
PS300/350-style air finger with adjustable shutter plate
Do not
IV. Oven Capacity
Conveyor Speed and Bake Time
Belt Time
Time of Delivery TOD
Original-style speed controller
Current-style speed controller
Conveyor Speed Controller and Drive Motor
Part Number Reference Speed Controllers
Current-style pickup assembly see Figures
Preparing to Service the Speed Controller
Part Number Reference Pickup Assemblies
Current pickup assembly side view
Current pickup assembly End view
Field Tester for Conveyor Drive Motor
Controller/Motor Failure
Basic Troubleshooting Flowcharts
If the Gear Motor Runs AT Full Speed
If the Gear Motor will not RUN AT ALL
Initial Troubleshooting
Check the magnetic pickup on the motor
Unshielded Pickup Wires on Early PS360-series ovens
Connections for pickup test
Conveyor Control Pickup Test Conveyor Motor Test
Replacing the Magnetic Pickup
Appendices
Servicing Components
Servicing Components
Servicing Components
Servicing Components
Servicing Components
Servicing Components
Subject
General
Application
Compatibility
Conveyor Speed Controller Kit for PS200R68-series ovens
Bulletin No. MM-189
II. Temperature Controller
Part Number Reference Temperature Controllers
28071-0012 a
28071-0018 a
34983 B
Description
COM
Digital 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 Module
Part Number Reference High Limit Control Mod- ules
Location
Appendix Instructions for Service Kit
High Limit Conversion Kit for PS300, 310, 350, & 360 Ovens
Installation
Not to Scale
For Ovens with a Digital Temperature Controller
For Ovens with an Analog Temperature Controller
Testing the Installation
Ovens with a cooldown feature Replacement
United Electric Model
Ovens without a cooldown feature Replacement
Middleby Corporation Service Hotline
Troubleshooting
IV. Thermocouples
Part Number Reference Thermocouples
Thermocouple Functions
Servicing 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 assembly
Blower motor fuses
Blowers
Bearing lubrication
Blower belt tension
Repositioning 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 motors
PS360-series ovens
Clockwise blower wheel
Inlet ring Blower wheel puller tool
PS570/570S blower configuration
PS555/570-series ovens
Standard
Pizza Hut
Intl. Tricon
Domino’s Q
PS500-series blower wheel orientation
Bearing replacement and alignment
Blower belt tension Repositioning the blower motor
VI. Blower Motor Centrifugal Safety Switch PS360-SERIES
Part Number Reference Blower Centrifugal Switch
Air pressure safety switch models
PS360WB70/EWB with Midco burner
PS360WB70/EWB with Wayne burner
Servicing Components
Servicing Components
Servicing Components
Servicing Components
PS570/570S flame gate adjustment
IX. PS570/570S Flame Gate
Part Number Reference Flame Gate
Flame Gate Orientation
PS200-series gas train
PS310, PS314, PS360 or PS360WB gas train
GAS Train and Burner System
Part Number Reference
PS360EWB or PS360WB70 gas train with Midco burner
PS360EWB or PS360WB70 gas train with Wayne burner
PS570S gas train
PS570G or PS555 gas train
Wayne burner exploded view
Part Number Reference Gas Orifices and Gas Conversion Kits
Component Identification
Burner type
Solenoid valve vs. Modulating valve
Pilot/Ignitor Assembly
End of burner without flame target Showing pilot shield
Flame targets
Flame structure
Flame Rectification
Voltage
Gas Pressure
Air shutter adjustment
Temperature
Pilot Application
Burner Blower Motor
Low Flame Bypass Orifice
Burner Transformer
Burner Motor Relay
High Flame Solenoid Valve if so equipped
Modulating Gas Valve if so equipped
Burrs in pilot adjustment portal
Combination Gas Control Valve
Pilot pressure
Ignition Module
Burner and Gas Train Troubleshooting
100
Gas Conversion Kits
Voltage Checks for Ignition Module Combination Gas Valve
101
Combination Gas Valve
Component Checks Reset System After Lockout
102
Check Spark Ignition Circuit
Check Spark Ignitor
Troubleshooting Flowcharts
103
104
105
106
107
Appendix Instructions for Service Kit 30185 Pilot Tee, 3/94
108
109
110
111
112
113
114
115
Appendix Instructions for Service Kit Ignition Module, 11/90
116
117
118
119
Appendix Instructions for All Gas Conversion Kits
English
120
Preparation and Disassembly
121
122
IV. Pilot Orifice Conversion
123
VII. GAS Leak Test VIII. Inlet Pressure Check
Manifold Pressure Adjustment
124
125
For Ovens with Wayne Burner, Propane to Natural Gas, 8/00
126
127
NUTS.3
128
IX. Pilot Pressure Adjustment
129
130
Pilot Orifice Replacement
131
Preparation
Main Orifice Replacement
LOW Flame Orifice Replacement PS360WB70 only
132
GAS Leak Test
Pilot Pressure Adjustment
Main Manifold Pressure Adjustment
133
Inlet Pressure Check
134
Conversion Labeling
Propane
36856
Propane to Natural Gas Installation Instructions
135
136
137
138
Natural
14 W.C./34.9mbar
139
PS200 electric early with mercury Contactors and fuses
140
XI. Electric Oven Heating System
Part No. Description
Removing elements
141
Individual element electrical data
Electrical leads disconnected
142
PS310/360-series ovens
Element bank removed spacer bracket visible
143
144
PS555 ovens
PS555 electric oven heating element removal
145
Mercury Contactor Replacement
146
147
148
Component Wiring
149
150
151
II. PS200-SERIES Ovens
152
153
154
155
156
157
158
159
III. PS360-SERIES Ovens Electrical Wiring Diagrams
160
161
162
163
164
165
III. PS555/570-SERIES Ovens Electrical Wiring Diagrams
166
167
168
169
170
171
Check and clean blow out machinery/control compartment
Check and clean blow out main blower motors
Check and clean blow out and brush axial fans
Check and clean igniter assembly
173
174
Multiply To Obtain
Pressure conversion chart
175
176
177
178
179
180