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Section 1 - Sequence of Operation....................................................4
I. Gas Oven Sequence of Operation .............................................4
II. Electric Oven Sequence of Operation .......................................6
Section 2 - Air Flow and Heat Transfer .............................................7
I. Types of Heat Transfer ...............................................................7
II. Blowers and Blower Speed .......................................................7
A. PS200-series ovens............................................................7
B. PS360-series ovens............................................................8
C. PS555/570-series ovens ....................................................8
III. Air Fingers ...................................................................................8
A. Description and Function ....................................................8
B. Configuration and Alignment ...............................................9
C. Performing a Test Bake .......................................................9
D. PS300/350 Air Finger Shutter Adjustment .........................10
IV. Oven Capacity ............................................................................12
A. Conveyor Speed and Bake Time .......................................12
B. Belt Time ..............................................................................12
C. Time of Delivery (TOD) .......................................................12
Section 3 - Troubleshooting and Servicing Components
I. Conveyor Speed Controller and Drive Motor.............................13
A. Part Number Reference - Speed Controllers ....................13
B. Part Number Reference - Pickup Assemblies ...................14
C. Preparing to Service the Speed Controller ........................14
D. Controller/Motor Failure ......................................................15
E. Basic Troubleshooting Flowcharts ...................................16
If the Conveyor Runs at Full Speed .........................16
If the Conveyor Will Not Run at All ..........................17
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, injury or death. Read the installation, operating and maintenance
instructions thoroughly before installing or servicing this equipment.
TABLE OF CONTENTS
WARNING
DISCONNECT THE OVEN FROM ITS ELECTRICAL
POWER SUPPLY
BEFORE SERVICING.
NOTICE
During the warranty period, ALL parts replacement and servicing should be performed by your
Middleby Marshall Authorized Service Agent. Service that is performed by parties other than
your Middleby Marshall Authorized Service Agent may void your warranty.
NOTICE
Using any parts other than genuine Middleby Marshall factory manufactured parts relieves the
manufacturer of all warranty and liability.
NOTICE
Middleby Marshall reserves the right to change specifications at any time.
F. Initial Troubleshooting .........................................................18
G. Conveyor Control Pickup Test............................................19
H. Conveyor Motor Test ..........................................................19
I. Replacing the Magnetic Pickup ..........................................19
J. Unshielded Pickup Wires on Early PS360-series Ovens .19
K. Appendices.........................................................................20
Conveyor sensor wiring changes for PS360-series
and PS570S, 10/95 ....................................................20
Service Bulletin MM-133B - Installation Instructions
for Conveyor Speed Controller Kit with Thumbwheel,
P/N 42810-0133, 4/95 ................................................21
Instructions for Service Kit 42810-0133- Conveyor
Speed Controller Kit with Thumbwheel, 4/95 ..........23
Service Bulletin MM-177 - Introduction and Compat-
ibility of Conveyor Speed Controller with Digital
Display, P/N 37337, 8/00...........................................27
Instructions for Service Kit 44756 - Conveyor Speed
Controller Kit for PS200R68-series Ovens, 2/02 ...28
Service Bulletin MM-189 - New Conveyor Gear
Motors, Brushes, and Pickup Clamps, 8/01............29
DIP switch settings for Conveyor Speed Controller
with Digital Display (P/N 37337), 4/02 .....................30
II. Temperature Controller ............................................................... 30
A. Part Number Reference - Temperature Controllers ..........31
B. Description ..........................................................................32
C. High Limit/Cooldown Functions..........................................32
D. Troubleshooting..................................................................32
E. Appendices .........................................................................32
Temperature Controller Terminal
Cross-Reference, 4/02..............................................32
Instructions for Service Kit 47321 - Digital
Temperature Controller Kit, 2/02 ..............................33
Service Bulletin MM-136 - Electrical Noise Filter
Capacitor Assembly on Temperature Controllers,
9/93 .............................................................................43