Page
technical service manual
PS200/220/224 Series PS310/360 Series PS555/570 Series
2002 Middleby Marshall, Inc
This Technical Service Manual includes information
TABLE OF CONTENTS
DISCONNECT THE OVEN FROM ITS ELECTRICAL POWER SUPPLY BEFORE SERVICING
Instructions for Service Kits 33984 and
TABLE OF CONTENTS continued
Instructions for Service Kit
Blower Motor Centrifugal Safety Switch PS360-series
SECTION SEQUENCE OF OPERATION
I. GAS OVEN SEQUENCE OF OPERATION
NOTE PS200VL-series ovens do not include a cooldown feature
SECTION 1 - SEQUENCE OF OPERATION F. High Limit
NOTE Electric oven models use a separate High Limit Control Module
I. TYPES OF HEAT TRANSFER
SECTION AIR FLOW AND HEAT TRANSFER
Blowers, belts and pulleys
II. BLOWERS AND BLOWER SPEED
Current standard air finger all oven models
Air finger operation
PS300/350 air finger with shutter plate
B. PS360-series ovens
B. Configuration and Alignment
3D air finger label if present
Internal air finger chart
C. Performing a Test Bake
Front-to-back uneven bake
D. PS300/350 Air Finger Shutter Adjustment
PS300/350-style air finger with adjustable shutter plate
Figure 10 - Belt Time
Figure 9 - Conveyor Speed Bake Time
Figure 11 - Time of Delivery
IV. OVEN CAPACITY
Current-style speed controller
SECTION SERVICING COMPONENTS
Original-style speed controller
4 or 8 DIP switches select oven model
2. Current-style pickup assembly see Figures
PS350-style pickup assembly used on early PS360
Old-style pickup assembly
C. Preparing to Service the Speed Controller
Field Tester for Conveyor Drive Motor
Current pickup assembly - side view
Current pickup assembly end view
D. Controller/Motor Failure
1. IF THE GEAR MOTOR RUNS AT FULL SPEED
E. Basic Troubleshooting Flowcharts
Middleby no longer stocks parts for the
2. IF THE GEAR MOTOR WILL NOT RUN AT ALL
SECTION 3 - SERVICING COMPONENTS
with a current model
120VAC supply. Wire colors vary by oven model
F. Initial Troubleshooting
Connections are reversed if conveyor direc- tion is reversed
G. Conveyor Control Pickup Test
Connections for pickup test
J. Unshielded Pickup Wires on Early PS360-series ovens
H. Conveyor Motor Test
Wiring for PS360 Shielded Pickup Cable - late terminal block design
Wiring for PS360 Shielded Pickup Cable - early terminal block design
K. Appendices
Speed Controller Kit with Thumbwheel, P/N 42810-0133, 4/95
SECTION 3 - SERVICING COMPONENTS
Speed Controller Kit with Thumbwheel, P/N 42810-0133, 4/95
SECTION 3 - SERVICING COMPONENTS
Conveyor Speed Controller Kit with Thumbwheel, 4/95
Appendix - Instructions for Service Kit
SECTION 3 - SERVICING COMPONENTS
Conveyor Speed Controller Kit with Thumbwheel, 4/95
Appendix - Instructions for Service Kit
SECTION 3 - SERVICING COMPONENTS
Conveyor Speed Controller Kit with Thumbwheel, 4/95
Appendix - Instructions for Service Kit
SECTION 3 - SERVICING COMPONENTS
Conveyor Speed Controller Kit with Thumbwheel, 4/95
Appendix - Instructions for Service Kit
SECTION 3 - SERVICING COMPONENTS
Conveyor Speed Controller with Digital Display, P/N 37337, 8/00
Service Bulletin
Middleby Cooking Systems Group
SUBJECT
for PS200R68-series Ovens, 2/02
Middleby Corporation Service Hotline
Conveyor Speed Controller Kit for PS200R68-series ovens
Instructions for Service Kit
Service Bulletin
Appendix - Service Bulletin MM-189 - New Conveyor Gear Motors
Brushes, and Pickup Clamps, 8/01
Middleby Cooking Systems Group
with Digital Display P/N 37337, 4/02
Appendix - DIP switch settings for Conveyor Speed Controller
II. TEMPERATURE CONTROLLER
P/N 36056 G - Service Kit P/N
Figure 22 - Temperature controllers AB DEFG
A. Part Number Reference - Temperature Controllers
P/N 46837 G - Service Kit P/N
B. Description
Appendix - Temperature controller terminal cross-reference, 4/02
E. Appendices
Installation, Programming and Troubleshooting Instructions
Digital Temperature Controller
Instructions for Service Kit
Middleby Corporation Service Hotline
Controller Types
Installation
Before you Begin
Electrical Connections
Figure 5b
Figure 4a
Figure 5a
Figure 4b
Jumper Setting
Programming
Temperature
Controller Service Instructions
Page 7 of
Diagnostic Error Messages
Page 8 of
Display
Digital Temperature Controller P/N Operating Instructions
Service Key
Unlock Key
Middleby Cooking Systems Group 1400 Toastmaster Drive Elgin, IL
Middleby Corporation Service Hotline
847 741-3300 FAX 847
Filter Capacitor Assembly on Temperature Controllers, 9/93
Appendix - Service Bulletin MM-136 - Electrical Noise
SECTION 3 - SERVICING COMPONENTS
Filter Capacitor Assembly on Temperature Controllers, 9/93
Appendix - Service Bulletin MM-136 - Electrical Noise
SECTION 3 - SERVICING COMPONENTS
III. HIGH LIMIT CONTROL MODULE
Figure 23 - High limit control modules Shown in PS360-series oven
C. Operation and Troubleshooting
A. Part Number Reference - High Limit Control Mod- ules
Appendix - Instructions for Service Kit
High Limit Conversion Kit for PS300, 310, 350, & 360 Ovens
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
Instructions for Service Kit
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
Appendix - Instructions for Service Kit
B. INSTALLATION
Page 2 of
NOT TO SCALE
Appendix - Instructions for Service Kit
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
High limit thermocouple location lower oven
Lighted Reset Switch Wiring and Installation
Appendix - Instructions for Service Kit
C. WIRING
Cooldown circuit wiring
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
Appendix - Instructions for Service Kit
D. TESTING THE INSTALLATION
Page 5 of
replacement
Appendix - Instructions for Service Kit
ovens with a cooldown feature
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
replacement
Appendix - Instructions for Service Kit
ovens without a cooldown feature
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
High Limit Conversion Kit for PS300, 310, 350 & 360 Ovens, 5/99
Appendix - Instructions for Service Kit
Middleby Corporation Service Hotline
A MIDDLEBY COMPANY
IV. THERMOCOUPLES
Figure 24 - Thermocouples
Troubleshooting
A. Part Number Reference - Thermocouples
Page
KIT CONTENTS - KIT P/N
Oven Thermocouple Kit
Instructions for Service Kits P/Ns 33984 and
KIT CONTENTS - KIT P/N
Analog Temperature Controller
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
Digital Temperature Controller
Thermocouple Wiring - PS360 Series
Appendix - Instructions for Service Kits 33984 and
Thermocouple Installation - PS360 Series
Oven Thermocouple Kit, 11/01
Digital Temperature Controller
Appendix - Instructions for Service Kits 33984 and
Analog Temperature Controller
Oven Thermocouple Kit, 11/01
Oven Thermocouple Kit, 11/01
Appendix - Instructions for Service Kits 33984 and
Digital Temperature Controller
PS536
NOTE FOR HIGH LIMIT THERMOCOUPLES
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
3. Disconnect the thermocouple leads. Refer to Figure
PS555 Electric and PS555E
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
NOTE FOR HIGH LIMIT THERMOCOUPLES
Oven Thermocouple Kit, 11/01
Appendix - Instructions for Service Kits 33984 and
3. Remove the rear shrouds. Open the blower motor com- partment doors
High limit thermocouple
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
position for ovens with
High limit thermocouple
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
High limit thermocouple
Left
Appendix - Instructions for Service Kits 33984 and
Oven Thermocouple Kit, 11/01
Right
Middleby Corporation Service Hotline
Appendix - Instructions for Service Kits 33984 and
Thermocouple Wiring - PS555G and PS570G
Oven Thermocouple Kit, 11/01
Blower motor fuses
Early-style PS200 indirect drive assembly
Current PS200 indirect drive assembly
V. BLOWERS A. PS200-series ovens
Repositioning the blower motor
Bearing lubrication
Blower belt tension
Loosen bolts to reposition motor and adjust belt tension
Fan shaft alignment tool
Not available
Part Number
Description
Not available
Cord tied to shaft
Figure 33 - Four-point alignment test for correct pulley alignment
Cord must touch sheaves at four points indicated by arrows
Description
date early-style fan shaft assembly to the current version shown here
Part Number
Part Number
Blower motor fuses - three-phase motors
Blower motor fuses - single-phase motors
B. PS360-series ovens
Figure 38 - Counterclockwise blower wheel
Figure 39 - Blower wheel placement Shown from rear of oven
Figure 37 - Clockwise blower wheel
Inlet ring
Figure 44 - Fuse/circuit breaker locations
Figure 42 - PS570/570S blower configuration
Figure 43 - PS555/570G blower configuration
A. PS555/570-series ovens
Description
Part Number Description
Part Number
Oven
PS500-series blower wheel orientation
Bearing lubrication
Blower belt tension and repositioning the blower motor
Figure 48 - Four-point alignment test for correct pulley alignment
A. Part Number Reference - Blower Centrifugal Switch
Figure 49 - PS360-series blower motor centrifugal safety switch
VI. BLOWER MOTOR CENTRIFUGAL SAFETY SWITCH PS360-SERIES
B. Troubleshooting
Figure 50 - Air pressure safety switch models
Dungs square-case “replacement” air switch with screw adjustment
B. Troubleshooting
PS360WB70/EWB with Midco burner
PS360WB70/EWB with Wayne burner
Connects to negative pressure side of air switch
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kits 35624 and
Air Pressure Switch Replacement Kits, 1/97
C. Appendices
Air Pressure Switch Replacement Kits, 1/97
Appendix - Instructions for Service Kits 35624 and
SECTION 3 - SERVICING COMPONENTS
P/N 36194 with Service Kit P/N 35624, 3/97
Appendix - Instructions to Replace an “Alternate” Air Switch
SECTION 3 - SERVICING COMPONENTS
P/N 36194 with Service Kit P/N 35624, 3/97
Appendix - Instructions to Replace an “Alternate” Air Switch
SECTION 3 - SERVICING COMPONENTS
IX. PS570/570S FLAME GATE
PS570/570S flame gate adjustment
Adjustment rod
A. Part Number Reference - Flame Gate
X. GAS TRAIN AND BURNER SYSTEM
PS200-series gas train
PS310, PS314, PS360 or PS360WB gas train
A. Part Number Reference
SWITCH
PS360EWB or PS360WB70 gas train with Midco burner
PS360EWB or PS360WB70 gas train with Wayne burner
SWITCH
NOT SHOWN components are installed on back wall of machinery
PS570S gas train
PS570G or PS555 gas train
SWITCH
same as
Figure 60 - Wayne burner - exploded view
B. Part Number Reference - Gas Orifices and Gas Conversion Kits
natural gas
C. Component Identification
Figure 61 - Midco burner
Figure 62 - Wayne burner
1. Burner type
Flame targets
Figure 63 - Pilot/ignitor assembly
End of burner without flame target showing pilot shield
D. Pilot/Ignitor Assembly
Flame Rectification
Flame structure
Figure 67 - Flame rectification Figure 68 - Pilot and probe
Voltage
Pilot Application
Air shutter adjustment
Temperature
Burner Blower Motor
H. Burner Motor Relay
Low Flame Bypass Orifice
G. Burner Transformer
I. High Flame Solenoid Valve if so equipped
K. Modulating Gas Valve if so equipped
Figure 71 - Modulating Gas System
Digital Temperature
L. Amplifier Board ovens with a modulating gas valve only
M. Combination Gas Control Valve
Figure 72 - Combination Gas Control Valve
Burrs in pilot adjustment portal
Pilot pressure
N. Ignition Module
1. Burner Blower Motor
P. Burner and Gas Train Troubleshooting
O. Gas Conversion Kits
3. Relay
5. Burner Operation
Voltage Checks for Ignition Module and Combination Gas Valve
8. System Troubleshooting
6. Check Grounding
11. Check Spark Ignitor
9. Component Checks Reset System After Lockout
10. Check Spark Ignition Circuit
Q. Checking the Gas Pressures
R. Troubleshooting Flowcharts
SECTION 3 - SERVICING COMPONENTS
SECTION 3 - SERVICING COMPONENTS
SECTION 3 - SERVICING COMPONENTS
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Pilot/Ignitor Kit, 7/91
S. Appendices
Appendix - Instructions for Service Kit 30185 - Pilot Tee, 3/94
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit 30185 - Pilot Tee, 3/94
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit 30185 - Pilot Tee, 3/94
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit 30185 - Pilot Tee, 3/94
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Combination Gas Valve, 1/92
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Combination Gas Valve, 1/92
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Combination Gas Valve, 1/92
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Combination Gas Valve, 1/92
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Ignition Module, 11/90
SECTION 3 - SERVICING COMPONENTS
Appendix - Instructions for Service Kit Ignition Module, 11/90
SECTION 3 - SERVICING COMPONENTS
during Burner Operation, 4/02
Appendix - Position of Combination Gas Valve Components
SECTION 3 - SERVICING COMPONENTS
PS360EWB all PS555 all PS570S units produced 4/00 or later
TORY BEFORE INSTALLING THIS KIT
ENGLISH- page ESPAÑOL - página
KIT COMPONENTS
for Ovens with Wayne Burner, Natural Gas to Propane, 8/00
ENGLISH
Appendix - Instructions for All Gas Conversion Kits
Typical PS200-series gas train configuration
ENGLISH
I. PREPARATION AND DISASSEMBLY
II. COMBINATION GAS CONTROL VALVE SAFETY REGULATORCONVERSION
Appendix - Instructions for All Gas Conversion Kits
Appendix - Instructions for All Gas Conversion Kits
VI. REASSEMBLY
ENGLISH
for Ovens with Wayne Burner, Natural Gas to Propane, 8/00
Remove the pilot adjustment cap screw from the
IX. PILOT PRESSURE ADJUSTMENT
STAND WELL CLEAR WHEN SWITCHING ON
4. If no leaks are detected by the test, depress the safety
for Ovens with Wayne Burner, Natural Gas to Propane, 8/00
X. MANIFOLD PRESSURE ADJUSTMENT
Appendix - Instructions for All Gas Conversion Kits
XI. MARKING AND LABELING
for Ovens with Wayne Burner, Propane to Natural Gas, 8/00
ENGLISH- page ESPAÑOL - página
KIT COMPONENTS
Propane to Natural Gas Operation
Typical PS300-series gas train configuration
for Ovens with Wayne Burner, Propane to Natural Gas, 8/00
Typical PS200-series gas train configuration
Typical PS555 or PS570S gas train configuration
ENGLISH
I. PREPARATION AND DISASSEMBLY
II. COMBINATION GAS CONTROL VALVE SAFETY REGULATORCONVERSION
Appendix - Instructions for All Gas Conversion Kits
Appendix - Instructions for All Gas Conversion Kits
VI. REASSEMBLY
ENGLISH
for Ovens with Wayne Burner, Propane to Natural Gas, 8/00
Appendix - Instructions for All Gas Conversion Kits
IX. PILOT PRESSURE ADJUSTMENT
ENGLISH
for Ovens with Wayne Burner, Propane to Natural Gas, 8/00
for Ovens with Wayne Burner, Propane to Natural Gas, 8/00
X. MANIFOLD PRESSURE ADJUSTMENT
Appendix - Instructions for All Gas Conversion Kits
SECTION 3 - SERVICING COMPONENTS
Natural Gas to Propane Installation Instructions
Middleby Marshall
PS360EWB and PS360WB70
2. PILOT ORIFICE REPLACEMENT
Pilot orifice assembly
3. MAIN ORIFICE REPLACEMENT
4. LOW FLAME ORIFICE REPLACEMENT PS360WB70 only
Low flame orifice replacement
Gas pressure measurement/adjustment locations
7. PILOT PRESSURE ADJUSTMENT
8. MAIN MANIFOLD PRESSURE ADJUSTMENT
Burner blower configurations
PS360WB70 placement
Red “LPG.” label placement on burner housing
Conversion information label placement PS360EWB placement
9. CONVERSION LABELING
Orifice, Pilot Assembly - Natural Gas, 0.032” 0.81mm
Propane to Natural Gas Installation Instructions
2. PILOT ORIFICE REPLACEMENT
Middleby Marshall
Pilot orifice assembly
3. MAIN ORIFICE REPLACEMENT
4. LOW FLAME ORIFICE REPLACEMENT PS360WB70 only
Low flame orifice replacement
Gas pressure measurement/adjustment locations
7. PILOT PRESSURE ADJUSTMENT
8. MAIN MANIFOLD PRESSURE ADJUSTMENT
Burner blower configurations
NATURAL
Yellow “NAT.” label placement on burner housing
9. CONVERSION LABELING
14” W.C./34.9mbar
Includes 4% reduction for each 1000 ft. above sea level, 4/02
Appendix - Equivalent Orifice Sizes at High Altitudes
SECTION 3 - SERVICING COMPONENTS
relays and circuit breaker blocks
PS200 electric early with mercury contactors and fuses
PS200 electric current with solid state
XI. ELECTRIC OVEN HEATING SYSTEM A. PS200-series ovens
Removing elements
Individual element electrical data
B. PS310/360-series ovens
Electrical leads disconnected
Removing the element bank mounting bolts
Part No. Description
107W
Element bank removed - spacer bracket visible
Individual element electrical data
Spacer brackets
Heating element assembly
Refer to Temperature Controller on Page
Heating element assembly
Heating element assembly
PS555 electric oven heating element removal
cover
D. Mercury Contactor Replacement
Place a deep well socket over the new Tinnerman clip
SECTION 3 - SERVICING COMPONENTS
SECTION ELECTRICAL WIRING DIAGRAMS
I. COMPONENT WIRING
SECTION 4 - ELECTRICAL WIRING DIAGRAMS B. Ignition Modules
II. PS200-SERIES OVENS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
PAGE 1 OF
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
PAGE 2 OF
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
PS200-series electric oven USA version, 208/240V main blower motor and heating elements, 120V control circuit
220-240V, 50/60 Hz, 3 Ph, 3 pole, 4 wire supply 3 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
DIAGRAMS
SECTION 4 - ELECTRICAL WIRING
III. PS360-SERIES OVENS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
DIAGRAMS
SECTION 4 - ELECTRICAL WIRING
III. PS555/570-SERIES OVENS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
PS555 gas oven early, 208/240V main blower motor and control circuit
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 1 Ph, 2 pole, 3 wire supply 2 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
208/240V, 50/60 Hz, 3 Ph, 3 pole, 4 wire supply 3 hot, 1 ground
SECTION 4 - ELECTRICAL WIRING DIAGRAMS
SECTION
25-point preventative maintenance checklist
REFERENCE
Decimal equivalents of drill sizes
Fractional inches to decimal and millimeter equivalents
SECTION 5 - REFERENCE
MULTIPLY
General conversion factors
Pressure conversions
TO OBTAIN
Pressure conversion chart
Ohm’s Law equation wheel
Common electrical wiring diagram symbols
SECTION 5 - REFERENCE
Common electrical wiring diagram symbols continued
SECTION 5 - REFERENCE
Common electrical wiring diagram symbols continued
SECTION 5 - REFERENCE
Common electrical wiring diagram symbols continued
SECTION 5 - REFERENCE
2002 Middleby Marshall, Inc
Commercial Food Equipment Service Association CFESA
Middleby is proud to support the
