MiddlebyMiddleby
Middleby
MiddlebyMiddleby
MarshallMarshall
Marshall
MarshallMarshall
A MIDDLEBY COMPANY
owner's
operating
& installation
manual
PS624-Series Electric Ovens: English
June 2, 2009
®
PS624-Series
Model
PS624E
OVENS
PS624 (Double)
PS624 (Single)
©2009 Middleby Marshall Inc.
PS624 (Triple)
Part No. 61584
Price $30.00
P: 12/08
NOTICE:
Owner's Operating and Installation Manual should be given to the user. The operator of the oven should
This
be familiar with the functions and operation of the oven.
This manual must be kept in a prominent, easily reachable location near the oven.
It is suggested to obtain a service contract with a Middleby Marshall Authorized Service Agent.
WARNING
FOR YOUR SAFETY, DO NOT STORE OR USE
GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER
APPLIANCE.
WARNING
Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, injury, or
death. Read the installation, operation, and maintenance
instructions thoroughly before installing or servicing this
equipment.
NOTICE
The warranty is
demonstrated under the supervision of a factory-authorized installer.
NOT VALID
unless the oven is installed, started, and
NOTICE
Contact your authorized Service Agency to perform maintenance and
repairs. A Service Agency Directory is supplied with your oven.
NOTICE
Using any parts other than genuine Middleby Marshall factory-manufactured
parts relieves the manufacturer of all warranty and liability.
NOTICE
Middleby Marshall (Manufacturer) reserves the right to
change specifications at any time.
KEEP THIS MANUAL IN A VISIBLE LOCATION NEAR THE OVEN
FOR FUTURE REFERENCE.
ii
Model No.
Modéle No.
Serial No.
Serié No.
Installation Date
Date d'installation
MIDDLEBY MARSHALL
N
O QUIBBLE LIMITED WARRANTY
(U.S.A. ONLY)
MIDDLEBY MARSHALL, HEREINAFTER REFERRED TO AS
“THE SELLER”, WARRANTS EQUIPMENT MANUFACTURED
BY IT TO BE FREE FROM DEFECTS IN MATERIAL AND
WORKMANSHIP FOR WHICH IT IS RESPONSIBLE. THE
SELLER’S OBLIGATION UNDER THIS WARRANTY SHALL
BE LIMITED TO REPLACING OR REPAIRING, AT SELLER’S
OPTION, WITHOUT CHARGE, ANY PART FOUND TO BE
DEFECTIVE AND ANY LABOR AND MATERIAL EXPENSE
INCURRED BY SELLER IN REPAIRING OR REPLACING
SUCH PART. SUCH WARRANTY SHALL BE LIMITED TO
THE ORIGINAL PURCHASER ONLY AND SHALL BE EFFECTIVE FOR A PERIOD OF ONE YEAR FROM DATE OF ORIGINAL INSTALLATION, OR 18 MONTHS FROM DATE OF PURCHASE, WHICHEVER IS EARLIER, PROVIDED THAT TERMS
OF PAYMENT HAVE BEEN FULLY MET.
This warranty is valid only if the equipment is installed, started,
and demonstrated under the supervision of a factory-authorized installer.
Normal maintenance functions, including lubrication, cleaning, or customer abuse, are not covered by this
warranty
Seller shall be responsible only for repairs or replacements
of defective parts performed by Seller’s authorized service
personnel. Authorized service agencies are located in principal cities throughout the contiguous United States, Alaska,
and Hawaii. This warranty is valid in the 50 United States
and is void elsewhere unless the product is purchased
through Middleby International with warranty included.
.
The foregoing warranty is exclusive and in lieu of all other
warranties, expressed or implied. There are no implied
warranties of merchantability or of fitness for a particular purpose.
The foregoing shall be Seller’s sole and exclusive obligation
and Buyer’s sole and exclusive remedy for any action, including breach of contract or negligence. In no event shall
Seller be liable for a sum in excess of the purchase price of
the item. Seller shall not be liable for any prospective or lost
profits of Buyer.
This warranty is effective on Middleby Marshall equipment sold on, or after, February 15, 1995.
no quibble
MIDDLEBY MARSHALL INC.
OVEN LIMITED WARRANTY
(Non U.S.A.)
The Seller warrants equipment manufactured by it to be free from
defects in material and workmanship for which it is responsible. The
Seller’s obligation under this warranty shall be limited to replacing or
repairing, at Seller’s option, without charge, F.O.B. Seller’s factory,
any part found to be defective and any labor and material expense
incurred by Seller in repairing or replacing such part. Such warranty
is limited to a period of one year from date of original installation or
15 months from date of shipment from Seller’s factory, whichever is
earlier, provided that terms of payment have been fully met. All labor
shall be performed during regular working hours. Overtime premium
will be charged to the Buyer.
This warranty is not valid unless equipment is installed, started,
and demonstrated under the supervision of a factory-authorized installer.
Normal maintenance functions, including lubrication, adjustment of
airflow, thermostats, door mechanisms, microswitches, burners
and pilot burners, and replacement of light bulbs, fuses and indicating lights, are not covered by warranty.
Any repairs or replacements of defective parts shall be performed by
Seller’s authorized service personnel. Seller shall not be responsible for any costs incurred if the work is performed by other than
Seller’s authorized service personnel.
When returning any part under warranty, the part must be intact and
complete, without evidence of misuse or abuse, freight prepaid.
Seller shall not be liable for consequential damages of any kind
which occur during the course of installation of equipment, or which
result from the use or misuse by Buyer, its employees or others of
the equipment supplied hereunder, and Buyer’s sole and exclusive
remedy against Seller for any breach of the foregoing warranty or
otherwise shall be for the repair or replacement of the equipment or
parts thereof affected by such breach.
The foregoing warranty shall be valid and binding upon Seller if and
only if Buyer loads, operates and maintains the equipment supplied
hereunder in accordance with the instruction manual provided to
Buyer. Seller does not guarantee the process of manufacture by
Buyer or the quality of product to be produced by the equipment
supplied hereunder and Seller shall not be liable for any prospective
or lost profits of Buyer.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF
ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSOEVER. SPECIFICALLY THERE ARE NO IMPLIED WARRANTIES
OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
PURPOSE.
The foregoing shall be Seller’s sole and exclusive obligation and
Buyer’s sole and exclusive remedy for any action, whether in breach
of contract or negligence. In no event shall seller be liable for a sum
in excess of the purchase price of the item.
© 2003 - Middleby Marshall, A Middleby Company.
The Middleby Marshall logo is a registered trademark of Middleby Marshall, A Middleby Company.
Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A. • (847) 741-3300 • FAX: (847) 741 4406
iii
TABLE OF CONTENTS
Page
SECTION 1
I. MODEL IDENTIFICATION .............................................. 1
SERIES PS624 ELECTRIC SPECIFICATIONS ................. 2
II. COMPONENT FUNCTION ............................................. 4
A. Conveyor Motor and Conveyor Belt ........................ 4
B. Blower Fan ................................................................. 4
C. Cooling Fan ................................................................ 4
D. Air Fingers and Blank Plates - See Figure 1-9 ........ 4
SECTION 2
I. UNLOADING ................................................................... 8
PARTS LIST FOR SERIES PS624 ELECTRIC OVEN
INSTALLATION KIT .................................................... 8
UTILITY ROUGH-IN DIMENSIONS AND POSITIONING
FOR PS624-SERIES OVENS .................................... 13
CIRCUIT BREAKER ..................................................... 13
ELECTRICAL SPECIFICATIONS ................................. 13
ELECTRICAL RATING ................................................. 13
SUPPLY WIRE .............................................................. 13
SUGGESTED ................................................................ 13
II. VENTILATION GUIDELINES ........................................ 13
III. ELECTRICAL CONNECTION INFORMATION FOR
PS624-SERIES OVENS. ........................................... 14
IV. ELECTRIC SUPPLY .................................................... 14
SECTION 3 INSTALLATION
I. CONTROL FUNCTIONS ................................................ 15
II. COMPONENT INFORMATION AND LOCATION ......... 16
A. Door Safety Switch .................................................. 16
B. Blower Switch .......................................................... 16
C. Heat Switch .............................................................. 16
D. Temperature Controller .......................................... 16
E. Conveyor ................................................................. 17
MEASURING CONVEYOR SPEED. ............................. 17
TABLE OF CONTENTS
(Continued)
Page
III. STEP-BY-STEP OPERATION ....................................... 18
A. Startup Procedures ................................................. 18
Daily Startup ................................................................. 18
Power Failure ............................................................... 18
B. Shutdown Procedure ............................................... 18
IV. NORMAL OPERATION - STEP-BY-STEP ................... 20
A.Daily Startup Procedure ........................................... 20
B. Daily Shutdown Procedure ...................................... 20
V. QUICK REFERENCE: TROUBLESHOOTING ............ 22
SECTION 4 MAINTENANCE
I. MAINTENANCE - DAILY ............................................ 24
A. Exterior ..................................................................... 24
B. Cooling Fan ............................................................... 2 4
C. Conveyor Belt .......................................................... 2 4
D. Crumb Pans ............................................................. 24
II. MAINTENANCE - MONTHLY ....................................... 25
A. Removing Conveyor From Oven For Cleaning ..... 25
B. Air Fingers Disassembly For Cleaning .................. 27
C. Reassembly of Air Fingers ..................................... 28
D. Reinstall End Plugs ................................................. 30
E. Conveyor Reassembly Into Oven .......................... 31
F. Checking Conveyor Belt Tension ........................... 31
G. Conveyor Belt Link Removal ................................. 32
H. Attaching Drive Chain ............................................. 3 3
III. MAINTENANCE - (3 and 6 MONTH) ............................ 34
PS624-SERIES ELECTRIC OVEN KEY
SPARE PARTS ........................................................... 35
KEY SPARE PARTS KIT ............................................... 35
SECTION 5 TROUBLESHOOTING
Troubleshooting Charts ...................................................... 3 7
SECTION 6 ELECTRICAL SCHEMATICS
Wiring Diagrams ............................................................... 39
iv
NOTE
Wiring Diagrams are in Section 6 of this Manual.
The diagram for each oven is also inside the left
side control box door.
SECTION 1
DESCRIPTION
I. MODEL IDENTIFICATION
The Middleby Marshall PS624-Series may be used
either as a single oven or stacked for use as double or
triple ovens.
A single PS624-Series Oven (Figure 1-1) can be mounted
on an insulated base with short legs for countertop use,
or on a leg stand with a lower shelf and casters for a free
standing unit. A double oven (Figure 1-2) consists of
two,
stacked,
consists of three stacked single ovens. The lower oven
is mounted on an insulated base with casters affixed.
On a double or triple oven, the ovens operate independently. All ovens use identical controls and components. One oven can be cleaned or serviced, while the
others are operating.
single ovens. A triple oven (Figure 1-3)
SECTION 1
DESCRIPTION
Figure 1-1. Single PS624 Oven
Figure 1-2. Double PS624 Oven
Figure 1-3. Triple PS624 Oven
1
SECTION 1
DESCRIPTION
PS624 SERIES OVEN SPECIFICATIONS
Conveyor Belt Width 18.00″ (457 mm)
Heating Zone Length 24.00″ (610 mm)
Baking Area Square Feet 3.0 sq. ft. (0.28 m2)
Overall Dimension – Standard Single Oven w/Legs - 8″ Exit tray Installed 64.00″ (1625 mm) L ×
Overall Dimension – Double Oven 64.00″ (1625 mm) L ×
Overall Dimension – Triple Oven 64.00″ (1626 mm) L ×
Weight of Single Oven 370 lb (167.8 kg)
Shipping Weight 499 lb (226.3 kg)
Shipping Cube 61.1 ft3 (1.73 m3)
Max. Operating Power 14.4 kW (17.4 kW Optional)
Maximum Operating Temperature 600°F (316°C)
Warm-up Time 20 min.
Belt Speed Limits 0.30 - 12:00
36.00″ (914 mm) W ×
43.69″ (1110 mm) H ×
36.00″ (914 mm) W ×
64.00″ (1625 mm) H ×
36.00″ (914 mm) W ×
69.25″ (1759 mm) H ×
SERIES PS624 ELECTRICAL SPECIFICATIONS
DOMESTIC OVENS
VOLTAGE PHASE HZ kW WIRING BREAKER POWER POWER
208 3 60 14.4 STD 4-WIRE / L1,L2,L3 & GROUND 50 A 8 GA, 4-WIRE NEMA 15-50P
3 50-60 17.4 OPT 4-WIRE / L1,L2,L3 & GROUND 60 A 4 GA, 4-WIRE NEMA 15-60P
240 3 60 14.4 STD 4-WIRE / L1,L2,L3 & GROUND 50 A 8 GA, 4-WIRE NEMA 15-50P
3 60 17.4 OPT 4-WIRE / L1,L2,L3 & GROUND 60 A 4 GA, 4-WIRE NEMA 15-60P
480 3 60 17.4 STD 5-WIRE / L1,L2,L3,N & GROUND 30 A 8 GA, 5-WIRE NS
INTERNATIONAL OVENS
VOLTAGE PHASE HZ kW WIRING BREAKER POWER POWER
208 3 50-60 17.4 OPT 4-WIRE / L1,L2,L3 & GROUND 60 A 6 GA, 4-WIRE - NS NS
3 50-60 14.4 STD 4-WIRE / L1,L2,L3 & GROUND 50 A 8 GA, 4-WIRE - NS NS
230-240 3 50-60 16 / 17.4 OPT 4-WIRE / L1,L2,L3 & GROUND 60 A 6 GA, 4-WIRE - NS NS
3 50-60 13.2 / 14.4 STD 4-WIRE / L1,L2,L3 & GROUND 50 A 8 GA, 4-WIRE - NS NS
380 3 50-60 17.4 STD 5-WIRE / L1,L2,L3,N & GROUND 40 A 10 GA, 4-WIRE - NS NS
400-416 3 50-60 16.1 / 17.4 STD 5-WIRE / L1,L2,L3,N & GROUND 35 A 6 GA, 5-WIRE - NS NS
STD = Standard
OPT = Optional
NS = Not Supplied
SIZE CORD PLUG
SPECIFICATION
SIZE CORD PLUG
SPECIFICATION
NOTE
Wiring Diagrams are contained in Section 6 of this Manual
and are also located inside inside the left side control box door.
Additional electrical information is provided on the oven's serial plate.
This Manual Must Be Kept For Future Reference.
2
SECTION 1
DESCRIPTION
2EMOVABLE
%ND0LUG5PPER
(EAT#ONVEYOR
2EMOVABLE
%ND0LUG,OWER
#ASTERS
2EMOVABLE
#ONVEYOR
!SSEMBLY
4EMPERATURE
#ONTROLLER
3PEED
#ONTROL
-AIN"LOWER
3WITCH
3WITCH
Figure 1-4. PS624-Series Oven Components Locations
3
SECTION 1
DESCRIPTION
II. COMPONENT FUNCTION (Figure 1-4)
II. COMPONENT FUNCTION
A. Conveyor Motor and Conveyor Belt
The conveyor belt is driven by a variable-speed electric
motor (Figure 1-5) operating through a gear reducer.
The motor speed is controlled by a digital control. The
stainless-steel wire belt can travel in either direction at
variable rates ranging from 30 seconds to 12 minutes; this
is the time that a product can take to pass through
the oven.
B. Blower Fan
The circulation air blower drive motors (2) are located in
the right side control box. The blowers force heated air
through the air fingers. The MAIN / BLOWER switch
must be set to “ON” or “I” for oven warmup and baking.
C. Cooling Fan — See Figure 1-5 and Figure 1-6
Cooling fans are located at the rear of each (left and
right) control box. Cooling air is drawn into each control
box and blown across the control components and
circulating blower bearings and exits the oven front and
rear louvers.
#OOLING&AN
"LOWER
-OTOR
Blower Assembly
IMPORTANT
THE CONTROL BOX DOORS MUST BE
CLOSED WHILE THE OVEN IS HOT OR
HEATING IN ORDER TO KEEP THE
COMPONENTS AND BEARINGS COOL.
D. Air Fingers - See Figure 1-7
An Air Finger Assembly is made up of three parts:
1. Outer Plate - The Outer Plate is the removable covering
with tapered holes, which direct the air stream onto the
product being baked.
2. Inner Plate -The perforated Inner Plate is vital in forming
the unique air jets. It must be assembled into the manifold
with its holes aligned with the holes of the outer plate.
3. Manifold - The Manifold is the assembly which slides
on tracks into the oven plenum.
Conveyor
Drive Motor
Right Control Box
Figure 1-5. Machinery Compartment
Components
4
SECTION 1
DESCRIPTION
"LOWER-OTOR!CCESS
#OOLING&AN'RILLE
0OWER#ABLE%NTRANCE
#ONNECTION
"LOCK!CCESS
#OOLING
&AN'RILLE
Figure 1-6. Cooling Fan
5
SECTION 1
DESCRIPTION
Outer Plate
Inner Plate
Finger
Manifold
Assembly
Baffle
Figure 1-7. Air Finger.
6
SECTION 2
SECTION 2
INSTALLATION
INSTALLATION
WARNING
The oven must be installed on an even (level) non-flammable flooring and any adjacent walls must
be non-flammable. Recommended minimum clearances are specified in the Description section of
this Manual.
WARNING
Do not obstruct the flow of combustion and ventilation air to and from your oven. There must be no
obstructions around or underneath the oven. Constructional changes to the area where the oven is
installed shall not affect the air supply to the oven.
CAUTION
For additional installation information, contact your local Authorized Service Agent.
NOTE
There must be adequate clearance between the oven and combustible construction. Clearance
must also be provided for servicing and for proper operation.
NOTE
An electrical wiring diagram for the oven is located inside the machinery compartment.
NOTE
All aspects of the oven installation, including placement, utility connections, and ventilation requirements,
must conform with any applicable local, national, or international codes. These codes supersede the
requirements and guidelines provided in this manual.
NOTE
In the USA, the oven installation must conform with local codes. Installed ovens must be electrically
grounded in accordance with local codes, or in the absence of local codes,
with the National Electrical Code (NEC), or ANSI/NFPA70.
NOTE - CANADA INSTALLATION
In Canada, the oven installation must conform with local codes. Installed ovens must be electrically
grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electrical Code
CSA C22.2.
NOTE - AUSTRALIA INSTALLATION
In Australia, the oven installation must conform with any requirements of the appropriate statutory authority.
NOTE - CE OVEN INSTALLATION
Four casters are provided to allow the oven to be more easily moved to the installation location. These casters
are intended to simplify pre-installation movement only, and are NOT suitable for use as part of a CE oven
installation. During the installation procedure, the casters MUST be removed, so that the oven can be
supported by the supplied 152mm adjustable legs.
NOTE - GROUNDING INSTRUCTIONS
The oven must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric
shock by providing an escape wirdor electric current. This product is equiped with a cord having a grounding wire
and an appropriate grounding plug. This plug must be plugged into a properly installed outlet in accordance with all
local codes and ordinances.
WARNING: Improper installation of the grounding plug can result in the risk of electric shock. The grounding wire
has insulation with an outer surface that is green with or without yellow stripes.
Implementation of the grounding requirements should be carried out by a qualified electrician or service techni-
cian. Do not modify the appliance plug provided. If the appliance plug does not fit the outlet, the outlet should be
replaced by a qualified electrician.
7
SECTION 2
INSTALLATION
NOTE: The oven, when installed, must be electrically
grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code
(NEC), or ANSI/NFPA70.
NOTE
There must be adequate clearance between
the oven and any adjacent combustible construction. Clearance must also be provided
for servicing and for operation.
CAUTION
It is recommended that the oven be placed under
a ventilation hood for adequate air supply and
ventilation.
CAUTION
Do not obstruct the flow of ventilation air to and
from your oven. Do not obstruct the fan holes in
the rear of the unit.
I. UNLOADING
Your Middleby Marshall PS624-Series Oven is shipped
partially assembled. It will arrive in a carton on a crate.
Carton size for a PS624-Series Oven is:
56.3″ (1422 mm) Long ×
41″ (1041 mm) Wide ×
40″ (1013 mm) High
The crate and carton
Bill of Lading. Report any visible damage to the transport
company, and check for the proper number of crates. If
apparent damage is found, make arrangements to file a
claim against the carrier. Surface Interstate Commerce
Regulations (U.S.A.) require that the claim must be
initiated by the consignee within 10 days from the date that
the shipment is received.
Installer should be qualified to install commercial
conveyor ovens, having suitable lifting equipment to
prevent personal injury.
must be examined before signing the
8
03/6%. ).34!,,!4)/.
2%15)2%$+)43!.$%15)0-%.4
/&
490% 03 33 03 33
).34!,,!4)/.
3INGLE /VEN
$OUBLE/VEN 1$
4RIPLE/VEN1$
3INGLE /VEN $OUBLE/VEN 4RIPLE /VEN&RXQWHU
)NSTALLATION )NSTALLATION )NSTALLATION )NSTALLATION
+IT0. +IT0. +IT0. +IT0.
#% #% #%
SECTION 2
INSTALLATION
2
10
12
11
4
Qty. Qty. Qty. Inc. with Inc. with
Single Double Triple domestic CE
Item Oven Oven Oven Part No. ovens? ovens? Description
1 2 2 2 59835 Yes Yes Top panel
2 1 1 1 61243 Yes Yes Insulated Base
3 4 4 -- 37900-0024 Yes Yes 1 5″ (381mm) leg extension,
4 2 2 2 22290-0009 Yes Yes Caster, with flat plate and brake
5 2 2 2 22290-0010 Yes Yes Caster, with flat plate (no brake)
NOTE: Domestic and standard export ovens include 2 braking casters (item 4) and 2 non-braking casters (Item 5).
CE-approved ovens include 4 non-braking casters (Item 5) SOLELY for the purpose of moving the oven to the installation
location. Casters are NOT suitable for use as part of CE oven installations. Refer to the notice on the preceding page.
6 4 4 4 22450-0028 N o No Leg, adjustable, 6″ (152mm)
7 32 32 32 220373 Yes Yes Hex bolt, 3/8″-16 x 1″
NOTE: CE-approved ovens include 32 hex bolts. Domestic and standard export ovens include 32 hex bolts. CE ovens are mounted
on legs (Item 6) and do not use a restraint cable.
8 32 32 32 21416-0001 Yes Yes Flat washer, 3/8 ″
9 32 32 32 21422-0001 Yes Yes Lockwasher, 3/8″
10 1 1 1 22450-0228 Yes N o Restraint cable assembly
11 1 1 1 61584 Yes Yes
12 1 1 1 1002040 Yes Yes Authorized Service Agency Listing
13 1 1 -- 61226 Yes Yes Lower shelf
7, 8, 9
13
1
3
6
5
for single and double ovens
Owner's Operating and Installation
Manual
Figure 2-1. PS624-Series Electric Oven Installation Kit
9
SECTION 2
INSTALLATION
10
Figure 2-5. MODEL PS624 SINGLE OVEN DIMENSIONS
SECTION 2
INSTALLATION
11
Figure 2-6. MODEL PS624 DOUBLE OVEN DIMENSIONS
SECTION 2
INSTALLATION
12
Figure 2-7. MODEL PS624 TRIPLE OVEN DIMENSIONS
UTILITY ROUGH-IN DIMENSIONS AND POSITIONING
FOR PS624-SERIES OVENS
SECTION 2
INSTALLATION
WARNING
DO NOT USE CONDUIT FOR
GROUND CONNECTION.
CAUTION
IT IS RECOMMENDED THAT THE OVEN
BE PLACED UNDER A VENTILATION
HOOD FOR ADEQUATE AIR SUPPLY
AND VENTILATION.
ELECTRIC SUPPLY TO BE
PROVIDED BY CUSTOMER
CIRCUIT BREAKER
A seperate circuit breaker with lockout/tagout electrical
shutoff is required for each, seperately wired oven.
See breaker sizing requirements below:
ELECTRICAL SPECIFICATIONS
NOTE: Please refer to page 2, Electrical Specifications
chart and your units data plate information, for more
detailed information.
DOMESTIC: 208V, 60 Hz, 14.4 kW, 50A Service
240V, 60 Hz, 14.4 kW, 50A Service
480V, 60 Hz, 17.4 kW, 30A Service
Do
NOT
use conduit for ground.
or
.
/
&
&
/
4O/VEN
MM
/
.
/
&
&
4O/VEN
MM
Suggested dimensions are shown; utility code
3UGGESTEDDIMENSIONSARESHOWNUTILITYCODE
requirements supersede any factors shown.
REQUIREMENTSSUPERSEDEANYFACTORSSHOWN
Figure 2-9. Typical PS624-Series Oven(s)
Installation
SUPPLY WIRE
Supply wire size must be in accordance with the
National Electrical Code (current edition) and must be in
compliance with local codes.
SUGGESTED
If space permits, service should be located near the
control console end of the oven(s) to allow convenient
access to safety switches.
II. VENTILATION GUIDELINES
Use of a ventilation hood is not required for proper
operation, but installation must conform with all local
codes and regulations.
EXPORT: CE MODEL
208V, 50/60 Hz, 14.4 kW, 50A Service
230-240V, 50/60Hz, 13.2/14.4 kW, 50A Service
380V, 50/60 Hz, 17.4 kW, 25A Service
Do
NOT
use conduit for ground.
POWER RATING
14.4 kW Standard
17.4 kW Optional
Local codes and conditions vary greatly from one area to
another and must be complied with. Following are the
suggested requirements for good ventilation. Please remember these are recommendations or guidelines, you
may have a special condition or problem that will require
the services of a ventilation engineer or specialist. Proper
ventilation is the oven owner’s responsibility. Improper
ventilation can inhibit oven performance.
13
SECTION 2
INSTALLATION
III. ELECTRICAL CONNECTION INFORMATION
FOR PS624-SERIES OVENS.
WARNING
Authorized supplier personnel normally accomplish the connections for the ventilation
system, electric and gas supplies, as arranged by the customer. Following these
connections, the factory-authorized installer
can perform the initial startup of the oven.
Check the oven data plate (Figure 2-10) before making any
electric supply connections. Electric supply connections
must agree with data on the oven data plate.
NOTE: The electric supply installation must satisfy the
requirements of the appropriate statutory authority, such
as the National Electrical Code (NEC), ANSI/NFPA70,
(U.S.A.); the Canadian Electrical Code, CSA C22.2; the
Australian Code AG601; or other applicable regulations.
A fused disconnect switch or a main circuit breaker
(customer furnished) MUST be installed in the electric
supply line for each oven; it is recommended that this
switch/ circuit breaker have lockout/tagout capability. The
electric supply connection must meet all national and local
electrical code requirements. Copper is the recommended
material for the electrical supply conductors.
IV. ELECTRIC SUPPLY
Electrical connection is made through a cord and plug.
A cord, plug and strain relief is supplied for Domestic
oven models, only. International ovens must supply,
See Electrical Specifications chart on page 2.
The supply conductors must be of the size and
material (copper) recommended to provide the current required; (refer to the data plate for the ampere
specifications). The power cord plug must not be
altered in any manner. Do not remove the grounding
prong from the electrical plug supplied, as this can
cause an unsafe operating condition.
ELECTRICAL
INLET
International CE Plate
Figure 2-10. Typical Electric Oven Data Plate
Figure 2-11. Junction Connection Box
Domestic Plate
14
I. CONTROL FUNCTIONS
SECTION 3
OPERATION
SECTION 3
OPERATION
4EMPERATURE
#ONTROLLER
3PEED
#ONTROL
-AIN"LOWER
3WITCH
(EAT#ONVEYOR
3WITCH
Figure 3-1. PS624-Series Oven Control Functions
WARNING
A possibility of injury from rotating parts and
electric shock exists in this oven.
Never disassemble or clean the oven with the
BLOWER switch or any other oven control turned
“ON” or “I”. Turn “OFF” or “O” and lockout or
tagout all electric power to the oven before
attempting to clean or service this oven.
15
SECTION 3
OPERATION
II. COMPONENT INFORMATION AND
LOCATION (Figures 3-1 and 3-2)
A. Door Safety Switch
The Door Safety Switch is located at the lower right side
of control panel opening. Opening the control panel door
permits this switch to open, disconnecting power to all
electrical controls, except for the blower motor inverters,
located in the left side control cabinet.
CAUTION
Do NOT touch the wires going to this safety switch.
Current is always present.
B. Blower Switch
The blower switch has two positions. The switch must
be “ON” or “I” for the main blowers to come on and permit
the oven to run. The fan circulates the air throughout the
oven and must stay on during baking and during the
cool down cycle above 200°F (93°C) to prevent blower
#ONVEYOR0OWER4RANSFORMER
bearing damage. To protect the blower motor and
bearings a thermostatic override is built into the oven.
If the temperature inside the oven is over 200°F (93°C)
the main blower will continue to run after the blower
switch is turned to the “OFF” or “O” position.
C. Heat / Conveyor Switch
The “Heat/Conveyor Switch” allows the heat to come on.
Activation is determined by the settings on the Digital
Temperature Controller.
D. Temperature Controller
The temperature controller is a solid-state, PID type to
maintain the operator-set temperature. The temperature
controller continuously monitors the oven temperature and
turns on the modulating solid state relay controller. The
heat is proportioned as required to maintain a constant
oven temperature.
The temperature controller contains a low-limit switch
which allows the oven to cool down to 200°F (93°C) before
shutting off the blower. A high-limit indication (ALM 1) will
appear on the display if the oven reaches 650°F (343°C).
#OOLING&AN
4EMPERATURE
#ONTROL
#ONVEYOR3PEED
#ONTROL"OARD
#IRCUIT"REAKERS
"LOWER-AIN
3WITCH
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(I,O"LOWER
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#ONVEYOR
'EARMOTOR
(IGH,IMIT
4HERMOSTAT
(IGH,IMIT
2ESET
Figure 3-2. Interior View of Control Console
16
$ISC
4HERMOSTAT
E. Conveyor
The on-off switch for the conveyor motor is on the control
panel. Also on the control panel is the digital conveyor
speed control. The digital control can be adjusted
from 30 seconds to 12 minutes bake time (conveyor
speed). Refer to Figure 3-3.
Conveyor speed is measured by the amount of time it
takes for an item to go through the bake chamber of the
oven.
MEASURING CONVEYOR SPEED.
SECTION 3
OPERATION
See Figures 3-4 and 3-5.
To check conveyor speed, place a product item at the
entrance end of baking chamber as shown. Time how long
it takes for the leading edge of the item to go from the
entrance end of the baking chamber to the exit end. This
should be the conveyor speed shown on the conveyor
speed digital control.
NOTE: In Figures 3-4 and 3-5, the oven shown is with the
conveyor running right to left.
WARNING
Possibility of injury from rotating parts and
electrical shock exist in this oven.
Never disassemble or clean the oven with the
blower switch or any other part of the oven
turned “ON” or “I”. Turn “OFF” or “O” and
lockout or tagout all electrical power to the
oven before attempting to clean or service
this oven.
Figure 3-3. Conveyor Speed Digital Control
Figure 3-4. Product at entrance end of baking
chamber – BEGINNING OF TIMING
17
Figure 3-5. Product at exit end of baking
chamber – END OF TIMING
SECTION 3
OPERATION
WARNING
OVEN MUST BE KEPT CLEAR OF
COMBUSTIBLES AT ALL TIMES.
III. STEP-BY-STEP OPERATION
A. Startup Procedures
Daily Startup
1. Turn the BLOWER switch (Figure 3-6) to the “ON” or “I”
position. This starts the main blower fan and the cooling
fans. The blower circulates air through the air fingers and
must stay on during the cooking or baking process.
2. Check to see if the cooling fans (see Figure 1-8) are
operating when the blower switch (see Figure 3-6) is turned
“ON” or “I”. The cooling fans cool the control components
and blower motor. The cooling fans, located at the rear of
the oven blows air into and through the cabinet. Air is
exhausted through the front of the cabinet and also out the
front of the oven. Refer to Daily Maintenance Section for
fan intake checking procedure.
IMPORTANT NOTE
The cooling fan operates when the BLOWER
switch is turned “ON” or “I”. It must operate to keep
the control console below 140°F (60°C).
3. Turn the HEAT/CONVEYOR switch (Figure 3-6) to the
“ON” or “I” position. This starts the conveyor belt moving
through the oven. Set the conveyor speed for the desired
baking time. Refer to the following Procedures E, F and G.
4. Set the temperature controller to the desired baking
temperature.
NOTE: For complete temperature controller operation
instructions refer to Step C.
5. Turn the HEAT/CONVEYOR switch (Figure 3-6) to
the “ON” or “I” position. Wait for the “Heat ON” light to
turn on.
6. Oven will reach a baking temperature of 500°F (232°C)
in about 10 minutes. Allow the oven to cycle for 20 minutes
after it has reached desired bake temperature. The oven
is now ready for baking.
7. Oven will continue to run at a reduced blower speed in
order to save energy, but will automatically change to the
higher, baking blower speed when product is placed on the
belt. The “energy eye” (photo eye) and an internal timer
control these changes. The changes in blower speed are
noticable and normal as the oven changes from baking to
energy saving mode.
NOTE: The time setting for the baking mode should be set
at installation, based upon the longest baked product
time. If the blowers return to the lower, energy saving
speed before the product fully exits the oven, contact your
local Middleby Marshall Service Agent for timing adjustment.
Power Failure
In case of power failure, turn off all switches and remove
product. After power has been reestablished follow
normal startup procedure.
B. Shutdown Procedure
1. Turn the BLOWER and HEAT/CONVEYOR switches
to “OFF” or “O”.
NOTE: The blowers will remain on until the oven temperature cools down to 200°F (93°C) at which time they will stop
automatically.
2. Make certain that there are no products left on the
conveyor inside the oven. Turn the HEAT/CONVEYOR
switch to “OFF” or “O”.
18
SECTION 3
OPERATION
(%!4#/.6%9/2
Figure 3-6. Control Panel
19
SECTION 3
(%!4#/.6%9/2
OPERATION
IV. NORMAL OPERATION - STEP-BY-STEP
A.Daily Startup Procedure
1. Check that the circuit breaker/fused disconnect is in the
on position.
2. Turn the "BLOWER"
( ) switch to the “ON”
("I") position.
3. Turn the "HEAT/CONVEYOR"
( ) switch to the “ON”
("I") position.
(%!4#/.6%9/2
4. If necessary, adjust the
conveyor speed setting
by pressing the
pushbuttons on the conveyor speed controller to
change the displayed
bake time.
5. Adjust the temperature
controller to a desired set
temperature, if necessary.
• Press the Set Point
and Unlock keys at
the same time. Wait
for the "SET PT" light
to turn on.
or
+
or
wait
for
7. Wait for the oven to heat to the setpoint temperature.
Higher setpoint temperatures will require a longer wait.
The oven can reach a temperature of 500°F (232°C) in
approximately 10-12 minutes.
8. (Optional) Press the Temperature (
the Actual Temperature
in the display, and wait
for the "ACTUAL TEMP"
light to turn on. This allows you to monitor the
oven temperature as it
rises to the setpoint.
9. Allow the oven to preheat for 10 minutes after it has
reached the set point temperature.
B. DAILY SHUTDOWN PROCEDURE
1. Turn the "HEAT/
CONVEYOR" (
and "BLOWER" (
switches to the "OFF"
("O") position. Note that
the blowers will remain
in operation until the
oven has cooled to
below 200°F (93°C).
2. Make certain that there
are no products left on
the conveyor inside the
oven. Turn the "HEAT/
CONVEYOR" (
switch to the "OFF" ("O")
position.
) key to show
)
)
wait
for
+
)
(%!4#/.6%9/2
• Press the Up Arrow
and Down Arrow
Keys as necessary
to adjust the setpoint.
6. Turn the "HEAT/CONVEYOR"
( ) switch to the "ON"
("I") position, and wait for the
"HEAT ON" light to turn on.
or
(%!4#/.6%9/2
wait
for
3. After the oven has cooled and the blowers have turned
to the “OFF” or “O” position, switch the circuit breaker/fuse
disconnect to the “OFF” or “O” position.
CAUTION
In case of power failure, turn all switches to the “OFF”
("O") position and remove the product. After the
power has been restored, perform the normal startup
procedure. IF THE OVEN WAS SWITCHED OFF FOR
LESS THAN 5 MINUTES,
MINUTES BEFORE RESTARTING THE OVEN.
20
WAIT FOR AT LEAST FIVE
SECTION 3
OPERATION
"SP LOCK"
Light
Lights when the
set point is locked
out from changes.
This setting can
only be changed by
service personnel.
OVERTEMP
Light
Lights when the oven
temperature is
greater than 650°F
(343°C). Refer to
Quick Reference:
Troubleshooting in
this section.
Display
Shows the Set Point
or the Actual Tem-
perature in degrees
Fahrenheit (F) or
Celsius (C).
"HEAT ON"
Light
Lights when the
burner is in
operation.
"SET PT"
(setpoint)
Light
Lights when the
set point is shown
in the display.
"ACTUAL TEMP"
Light
Lights when the Actual
Temperature is shown
in the display.
Temperature
Key
Press this key once
to view the Actual
Temperature in the
Display.
together with the Set
Point Key to allow the
changed. Changes
can only be made for
Unlock Key
Press this key
Set Point to be
60 seconds.
Up Arrow and Down
Arrow Keys
Press these keys to
adjust the Set Point up or
down. If the Set Point will
not change, refer to Set
Point Key and Unlock Key
in this section.
Service Key
Service use
only.
Set Point Key
Press this key
together with the
Unlock Key to allow
the Set Point to be
changed.
Changes can only be
made for 60 sec-
onds.
21
SECTION 3
OPERATION
V. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM PROBLEM SOLUTION
light is lit, food product is
undercooked
Oven will not
turn on at all
appears in display,
oven is not heating
Oven will not heat
The oven temperature exceeded 650°F (343°C), and
the burner was automatically shut down.
Electrical power may not be
reaching the oven, or the
controls may be set incorrectly.
The oven did not reach
200°F (93°C) within 10-12
minutes of startup, and the
oven has stopped heating.
Controls may be set
incorrectly.
• Follow the procedures under Daily Shutdown Procedures in
this section to shut down the oven. Contact your Middleby
Marshall Authorized Service Agent to determine and correct the
cause of the condition to prevent damage to the oven.
• Check that the circuit breaker/fused disconnect is turned on.
• Check that the "BLOWER"
position.
• Turn the "HEAT/CONVEYOR" (
switches to the "OFF" ("O") position.
• Wait for AT LEAST FIVE MINUTES before restarting the oven.
• Repeat the Daily Startup procedure.
• Check that the Set Point is correctly set.
• Check that both the "BLOWER"
( ) Switches are in the “ON” ("I") position.
• If the oven still will not heat,turn the "HEAT/CONVEYOR" (
) and "BLOWER" ( ) switches to the "OFF" ("O") position.
• Wait for AT LEAST FIVE MINUTES before restarting the oven.
• Repeat the Daily Startup procedure. Check that the Set Point
is above 200°F (93°C).
( ) Switch is in the “ON” ("I")
) and "BLOWER" ( ),
( ) and "HEAT/CONVEYOR"
Oven is operating, but
little or no air is blowing
from air fingers
Conveyor moves with a
jerky motion, or will not
move at all
Food products are
overcooked or
undercooked.
Air fingers may have been
reassembled incorrectly
after cleaning.
Conveyor may be jammed
on an object in the oven, or
conveyor belt or drive chain
tension may be incorrect.
Controls may be set incorrectly.
• Turn the oven to the “OFF” or “O” position, and allow it to cool.
Disconnect electrical power to the oven.
• Refer to Section 4,
bling the air fingers.
• Turn the oven to the “OFF” or “O” position, and allow it to cool.
Disconnect electrical power to the oven.
• Check if the conveyor is blocked by an object inside the oven.
• Refer to Section 4,
the conveyor and drive chain tension.
• Check that the set temperature and bake time settings are
correct.
Maintenance, for instructions on reassem-
Maintenance, for instructions on checking
IF THESE STEPS FAIL TO RESOLVE THE PROBLEM, CONTACT YOUR LOCAL MIDDLEBY MARSHALL
AUTHORIZED SERVICE AGENT. A SERVICE AGENCY DIRECTORY IS SUPPLIED WITH YOUR OVEN.
22
MAINTENANCE
SECTION 4
MAINTENANCE
WARNING
Before ANY cleaning or servicing of the oven, perform the following procedure:
1. Switch off the oven and allow it to cool. Do NOT service the oven while it is warm.
2. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven.
When all cleaning and servicing is complete:
1. If the oven was moved for servicing, return the oven to its original location.
2. Reconnect the electrical supply.
3. Turn on the electric supply circuit breaker(s).
4. Perform the normal startup procedure.
WARNING
Possibility of injury from rotating parts and electrical
shock exist in this oven. Turn off and lockout or tagout
electrical supply to oven(s) before attempting to
disassemble, clean or service oven(s). Never disas-
semble or clean the oven with the blower switch or any
other part of the oven turned on.
SECTION 4
WARNING
Before performing any maintenance work or cleaning,
turn main power switch off.
CAUTION
When cleaning do not use any abrasive cleaning
materials or water spray, wipe clean only. Never use a
water hose or pressurized steam cleaning equipment
when cleaning this oven.
NOTICE
If the oven is to be removed from its installed location
for servicing, perform the following procedure:
1. Switch off the oven and allow it to cool. Do NOT
service the oven while it is warm.
2. Turn off main circuit breakers and disconnect
connector from oven.
3. Move oven to desired location for servicing.
4. When servicing is complete, move oven to original
location.
5. Adjust legs to level oven.
6. Connect electrical connectors to oven.
7. Turn on main circuit breakers.
8. Follow normal startup instructions.
23
SECTION 4
MAINTENANCE
I. MAINTENANCE - DAILY
A. Exterior
Everyday you should clean the outside of the oven with a
soft cloth and mild detergent.
WARNING
Never use a water hose or pressurized steam
cleaning equipment when cleaning the oven.
B. Cooling Fan
1. TWO COOLING FAN GRILLES AT THE REAR OF
THE OVEN MUST BE CLEANED DAILY - Clean grilles
with a stiff nylon type brush.
2. Check the air intakes of the cooling fans daily. The best
time to check is right after starting the oven.
IMPORTANT NOTE
The cooling fans operate when the blower switch
is turned to “ON” (“I”). It must operate to keep the
electrical control cabinet below 140°F (60°C).
D. Crumb Pans (Figure 4-2)
WARNING
Crumb pan is extremely hot while oven is
operating. Allow oven to cool before
removing crumb pan.
When the oven is cool remove and clean the crumb pan at
each end of the oven. Each crumb pan can be removed
by sliding it out, as shown in Figure 4-2. Reinstall the
crumb pans after cleaning.
CoolingFans
WARNING
IF THE FAN BLADES ARE NOT ROTATING,
BROKEN, OR THE FAN ASSEMBLY IS MISSING
FROM THEMAIN BLOWER MOTOR SHAFT,
DO NOT OPERATE THE OVEN. REPLACE THE
COOLING FAN BLADE BEFORE OPERATING
OVEN. Serious damage could be done to the
burner blower motor and/or solid-state electrical
components if the oven is operated while the
cooling fans are not running or if the vent grilles
are plugged.
3. Using a stiff nylon brush clean the control compartment
vent grilles.
C. Conveyor Belt (Figure 4-2)
Everyday, just after starting the oven, stand at the
unloading end of the conveyor, and with a brush, remove
food particles (crumbs, etc.) clinging to the conveyor belt,
brushing them into the crumb pan.
Figure 4-1. Oven Cooling Fans
24
Figure 4-2. Conveyor Belt and
Crumb Pan Cleaning
SECTION 4
MAINTENANCE
II. MAINTENANCE - MONTHLY
NOTE: The oven interior may require cleaning more
than once a month depending on the volume of
baking. To clean the interior, you have to disassemble
some parts of the oven.
When cleaning your Series PS624 Oven note the
following:
PRECAUTIONS-
1. Do not use excessive water or saturation of oven
insulation will occur.
2. Do not use a caustic oven cleaner or the aluminized
finger manifold surfaces will be severely damaged.
When cleaning your oven, first remove all heavy debris
with a vacuum cleaner. Use a damp cloth for light cleaning.
For heavier cleaning of baked on grease and carbon
deposits use a non-caustic cleaner that will not react with
the aluminized finger manifold surfaces.
You can order non-caustic cleaner from your local authorized Middleby Marshall Parts Distributor in the quantities
listed below:
Part # Quantity
27170-0244 Case of Quarts (6)
27170-0246 Case of Gallons (4)
A. Removing Conveyor From Oven For Cleaning
1. Loosen two screws and remove chain/sprocket cover
(right side).
2. Push down and hold on the end of the conveyor (right
side) to remove tension from the chain allowing the
chain to be slipped off the conveyor shaft sprocket.
3. Now the conveyor assembly can be slid out the drive.
(right) side of the oven.
2EMOVABLE
%ND0LUG5PPER
2EMOVABLE
#ONVEYOR
!SSEMBLY
Figure 4-3.
4EMPERATURE
#ONTROLLER
3PEED
#ONTROL
-AIN"LOWER
3WITCH
(EAT#ONVEYOR
3WITCH
2EMOVABLE
%ND0LUG,OWER
#ASTERS
25
SECTION 4
MAINTENANCE
,OOSEN4WO3CREWSAND
2EMOVE#HAIN3PROCKET#OVER
Figure 4-4.
Figure 4-5.
Figure 4-6.
Figure 4-7.
26
CAUTION
Be careful not to bump the drive sprocket while
handling the conveyor, to avoid damaging the
drive shaft.
B. Air Fingers Disassembly For Cleaning
1. As the air fingers are removed use a felt pen to mark all
parts of the fingers. This includes the finger manifold, inner
plate and the outer plate (refer to Figure 1-9). Fingers are
marked in the order shown; as viewed from the front of the
oven. (The marks for an upper oven should be preceded
with a “U”, example UB1, UT2, etc.)
T1 T2 T3
B1 B2 B3
Standard Fingers
2. Remove air fingers.
NOTE: Some oven users require a custom finger arrangement where the quantity of air fingers may vary.
SECTION 4
MAINTENANCE
You can remove top and bottom fingers from each or either
end. It is highly recommended that each finger be marked
before removing so it is placed in exactly the same
position when reassembled (refer to step 1).
Remove the air fingers, pull the finger at the back side - pull
straight out.
Figure 4-9.
6. To remove the inner plate, pull the plate out and then up.
Figure 4-10.
6. The outer finger plate is stainless and may be cleaned
by either soaking in a hot, strong detergent solution or
using a caustic cleaner. The conveyor belt can also be
cleaned in the same way.
Figure 4-8.
3. With air fingers out, place them in an upright position to
remove the outer plate.
4. Gently step on the lip of the finger and pull the outer
plate off.
27
SECTION 4
MAINTENANCE
Figure 4-11. Standard Lower Finger
2. Reassemble the inner plate. Keep your fingers clear so
you won’t pinch them. The inner plate of a finger will only
go in one way because of its design.
3. Replace the outer plate by placing your hands flat on
the top of the plate and pushing down. Keep your fingers
clear so you won’t pinch them.
Figure 4-12. Standard Upper Finger
C. Reassembly of Air Fingers
1. Air fingers are made up of one inner plate, one outer
plate and the finger housing manifold. Be sure to match up
the markings (T1, T2, T3, etc.) on all the parts of the air
fingers as you are reassembling.
Figure 4-14.
4. Replace the air fingers by pushing in at the back side.
Remember to replace them according to the numbers
marked on them when they were removed. They must go
back in the same way they came out.
Figure 4-13.
Figure 4-15.
28
5. Install fingers with center spacer between the two finger back plates to insure proper spacing
Center Spacer
SECTION 4
MAINTENANCE
Extended Lip
Flange of
Finger
Manifold
Figure 4-16.
29
SECTION 4
MAINTENANCE
D. Reinstall End Plugs
1. Reinstall lower end plug (has flange that extends into
oven). Place and secure plastic wing nuts on the end plug.
2. Reinstall conveyor.
3. Reinstall upper end plug (no inner flange). Place and
secure plastic wing nuts on the end plug.
Figure 4-17.
2EMOVABLE
%ND0LUG5PPER
(EAT#ONVEYOR
2EMOVABLE
%ND0LUG,OWER
#ASTERS
2EMOVABLE
#ONVEYOR
!SSEMBLY
4EMPERATURE
#ONTROLLER
3PEED
#ONTROL
-AIN"LOWER
3WITCH
3WITCH
Figure 4-18.
30
SECTION 4
MAINTENANCE
E. Conveyor Reassembly Into Oven
1. Lift conveyor and position it in oven as shown.
NOTE: Conveyor must be inserted into the drive end of
oven.
F. Checking Conveyor Belt Tension
WARNING
Oven conveyor belt must be cool when adjusting
belt. Do not adjust belt if HOT.
1. With the conveyor assembly in the oven, stand at one
end of conveyor and check tension by lifting the conveyor
belt at the center of the oven chamber opening. The belt
should not lift higher that 1″ to 2″ (75mm to 102mm).
2. If conveyor belt is still not under proper tension, an
entire link must be removed. Use the following procedure
“G. Conveyor Belt Link Removal” to remove a link. If
conveyor belt is under proper tension proceed directly to
“H. Attaching Drive Chain”.
Figure 4-19.
2. Reinstall the conveyor extension.
Conveyor Extension
Figure 4-20.
Figure 4-21.
31
SECTION 4
MAINTENANCE
G. Conveyor Belt Link Removal
1. Using long nose pliers, an entire link can be removed
with the conveyor assembly either in or out of the oven.
Position master links at end of conveyor as shown in
Figure 4-22.
Master
Links
Figure 4-22.
4. Unhook the link to be removed.
5. Pull up on the belt link section and remove. Do not
discard the link removed as it may be used for making
spare master links.
NOTE: If a section of the conveyor belt is being replaced
it should be done now. Remove the links that need
replacing and use the section of conveyor belt furnished in
your installation kit to replace them.
2. Using long nose pliers, unhook master links at left end
of conveyor as shown in Figure 4-23.
Figure 4-23.
3. Remove the outside master links on the right and left
sides of the conveyor belt as shown in Figure 4-24.
Figure 4-25.
NOTE: Before connecting the inside master links, notice
that these links have a correct position (Figure 4-26). The
link at the right is in the correct (horns up) position for
inserting into the conveyor belt. The horns facing down are
in the incorrect position.
Correct
Position
Incorrect
Position
Figure 4-26.
Figure 4-24.
32
SECTION 4
MAINTENANCE
6. Reconnect the inside master links (Figure 4-27.)
Figure 4-27.
NOTE: The outside master links have right and left sides
to them. The right edge master link has an open hook
facing you as shown in Figure 4-28. This will match up with
the outer edges of the conveyor belt. Remember this hook
travels backwards on the conveyor.
Direction of travel
H. Attaching Drive Chain
1. If drive sprocket assembly was removed reassemble it
into the conveyor drive shaft. Be sure flat on end of drive
shaft aligns with set screw in conveyor shaft collar. Once
in place tighten 3/32″ set screw.
2. Push and hold conveyor end down to reinstall the
chain.
Figure 4-28.
7. Reconnect the outside master links.
8. Replace all parts removed from the oven.
Figure 4-29.
Figure 4-30.
3. The angle plate located on the underside of the conveyor must be against the lower end plug. This is true on
both sides of oven.
Crumb Pan
Mounting
Bracket
Lower End Plug
Figure 4-31.
33
SECTION 4
MAINTENANCE
4. Reattach conveyor guard to control panel and secure
two screws.
5. Install both upper end plugs.
2EPLACE#HAIN3PROCKET#OVERAND
)NSERTAND4IGHTEN4WO3CREWS
Figure 4-32.
IMPORTANT NOTICES:
• Installation of replacement parts requiring access
to the interior of the oven is permitted only by an
authorized service technician.
• If there are any problems with the operation of the
oven, the authorized service technician must be
called.
• It is suggested to obtain a service contract with a
manufacturer’s authorized service technician.
III. MAINTENANCE (3 and 6 MONTH)
WARNING
Shut OFF all electrical power and lock/tag out the
switch before attempting maintenance work.
NOTE: It is recommended that the 3-month and 6-month
maintenance items be performed by an authorized
Middleby Marshall technician.
34
KEY SPARE PARTS KIT
Replacement parts can be purchased from your Middleby Marshall Authorized Parts Distibutor.
Keeping these key parts on hand can prevent long downtime for your oven.
PS624-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT
ITEM PART NO. ENGLISH DESCRIPTION QUANTITY
1 44549 Contactor, 230V, Coil 85A 1
2 59558 Motor, Blower 1
3 60520-2 Thermocouple, Type “J” 2.00″ (Temperature Control) 2
4 58131 Filter, RFI (380 VAC versions ONLY) 1
5 60185 Photoeye Sensor 1
6 31504 Transformer, 230V (P), 120V (S) 200V 1
7 44696 Switch, Rotary and Mounting Adapter 3
8 44697 Block, Contact 3
9 48635 Breaker, Circuit 240V 0.3A 2
10 62044 Switch, Air .08″ WC 1
11 60952 Relay, DPDT 240VAC Coil 1
12 44914 Controller, PS555EL 208/240V 1
13 44568 Controller, PS555EL 380/480V 1 Each
14 97525 Fan, Cooling 230V 1
15 61079 Assy, Blower Scroll PS624E 2
16 60134 Element,Htg 208V 7.2 KW PS624 1
16 60976 Element,Htg 208V & 416V 8.7 KW PS624E 1
16 61571 Element,Htg 240V 7.2 KW PS624 1
16 61132 Element,Htg 240V 8.7 KW PS624E 1
16 61030 Element,Htg 380V 8.7 KW 1
17 33983 Control, Electric Hi-Limit 240V 1
18 33812-8 Thermocouple, Type “J” shielded 2.50 × 60 1
19 45019 Breaker, Circuit 480VAC 63A 3Pole 1
20 60058 Inverter, Lenze 1/3 HP 2
21 47321 Control, Combo 4-20mA, Burst 1
22 60542 CNTRL, Conv Digital Hardened 1
23 58500 Motor, Conveyor Drive (w/o Sensor) 1
24 61185 Relay, Time Delay DSQUD3 1
25 61186 Power Supply, 24 VDC 40W 1
26 45036 Breaker, Circuit 240V 3A 2
27 59206 Breaker, Circuit 240V 10A 1
28 60947 Thermostat, Snap Disc Man Reset 1
SECTION 4
MAINTENANCE
Figure 4-33.
35
SECTION 4
MAINTENANCE
NOTES
36
SECTION 5
TROUBLESHOOTING
SECTION 5
TROUBLESHOOTING
PROBLEM:
PRODUCTS ARE OVERCOOKED
OR UNDERCOOKED
Check for correct
setting of conveyor
speed control.
Set the conveyor speed
control at correct setting.
Verify the food
preparation process.
If products still cook incorrectly,
call your Middleby Marshall
Service Agency.
setting on tempera-
Turn temperature
Check for correct
ture controller.
control to correct
setting.
PROBLEM:
OVEN BLOWER AND CONVEYOR
OPERATE, YET THE OVEN IS NOT HEATING
Reset the temperature controller
to a new setting (above 200°F),
after turning the BLOWER switch
to off for 30 seconds.
Start the oven again. If the oven still does not
heat, call your Middleby Marshall Service Agency.
PROBLEM:
CONVEYOR WILL NOT HOLD PROPER
SPEED OR WILL NOT RUN AT ALL
Check whether the conveyor is
jammed on something in oven.
PROBLEM:
OVEN DOES NOT HEAT
Check to see if both BLOWER
switch and HEAT switch are in
the “ON” or “I” position.
If oven does not heat, call your
Middleby Marshall Service Agency.
PROBLEM:
BLOWER MOTOR IS RUNNING, YET LITTLE
OR NO AIR BLOWS FROM AIR FINGERS
Air fingers reassembled incorrectly,
after cleaning.
Assemble air fingers correctly, after cleaning.
Refer to Section 4 procedure, or call your
Middleby Marshall Service Agency.
Check for proper tension of conveyor drive
chain and conveyor belt. Refer to Section 4 for
correct procedure.
Check that the conveyor
drive sprocket is tight.
If conveyor still does not run correctly, contact
your Middleby Marshall Service Agency.
PROBLEM:
OVEN DOES NOT TURN ON WHEN ITS
SWITCHES ARE TURNED ON
Check that all electric supply switches are set to
the “ON” or “I” position. Then, start the oven.
If oven still will not start, contact your Middleby
Marshall Service Agency.
37
SECTION 5
TROUBLESHOOTING
NOTES
38
ELECTRICAL SCHEMATICS
SECTION 6
ELECTRICAL SCHEMATICS
SECTION 6
61567B
39
Wiring Diagram, E208-240V, PS624E/PS824E
SECTION 6
ELECTRICAL SCHEMATICS
61577B
40
Wiring Diagram, E380V 17.44 kW, PS624E/PS824E
SECTION 6
ELECTRICAL SCHEMATICS
61581B
41
Wiring Diagram, E380V 17.4 kW, PS624E/PS824E CE
SECTION 6
ELECTRICAL SCHEMATICS
61534B
42
Wiring Diagram, 400-416V 4 kW, PS624E/PS824E
NOTES
SECTION 6
ELECTRICAL SCHEMATICS
43
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.
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.
Middleby is proud to support the Commercial Food Equipment
Service Association (CFESA). We recognize and applaud
CFESA's ongoing efforts to improve the quality of technical
service in the industry.
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • USA • (847)741-3300 • FAX (847)741-4406
www.middleby.com
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