PS640 Series
Gas
Domestic & Std. Export
ENGLISH
P/N 60251
August 2007
PS640 Series Gas Ovens
Model:
• PS640G Gas
Combinations:
• Single Oven
• Double Oven (Two-Stack)
• Triple Oven (Three-Stack)
OWNER'S OPERATING AND
INSTALLATION MANUAL
for domestic and standard export ovens
©2007 Middleby Marshall Inc.
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • (847)741-3300 • FAX (847)741-4406
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Model No.
Modéle No.
Serial No.
Serié No.
Installation Date
Date d'installation
MIDDLEBY MARSHALL
NO QUIBBLE LIMITED WARRANTY
(U.S.A. ONLY)
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’sobligationunderthiswarrantyshallbelimitedtoreplacingor
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, providedthattermsofpaymenthavebeenfullymet. Alllabor
shallbeperformedduringregularworkinghours.Overtimepremium
will be charged to the Buyer.
MIDDLEBY MARSHALL, HEREINAFTER REFERRED TO
AS “THE SELLER”, WARRANTS EQUIPMENT MANUFAC-
TURED BY IT TO BE FREE FROM DEFECTS IN MATE-
RIAL AND WORKMANSHIP FOR WHICH IT IS RESPON-
SIBLE. THE SELLER’S OBLIGATION UNDER THIS WAR-
RANTY SHALL BE LIMITED TO REPLACING OR REPAIR-
ING, AT SELLER’S OPTION, WITHOUT CHARGE, ANY
PART FOUND TO BE DEFECTIVE AND ANY LABOR AND
MATERIAL EXPENSE INCURRED BY SELLER IN REPAIR-
ING OR REPLACING SUCH PART. SUCH WARRANTY
SHALL BE LIMITED TO THE ORIGINAL PURCHASER
ONLY AND SHALL BE EFFECTIVE FOR A PERIOD OF
ONEYEAR FROM DATE OF ORIGINAL INSTALLATION, OR
18 MONTHS FROM DATE OF PURCHASE, WHICHEVER
IS EARLIER, PROVIDEDTHATTERMS OF PAYMENT HAVE
BEEN FULLY MET.
Thiswarrantyisnotvalidunlessequipmentisinstalled,started,
and demonstrated under the supervision of a factory-autho-
rized installer.
Normal maintenance functions, including lubrication, adjustment of
airflow,thermostats,doormechanisms,microswitches,burnersand
pilot burners, and replacement of light bulbs, fuses and indicating
lights, are not covered by warranty.
This warranty is valid only if the equipment is installed, started,
and demonstrated under the supervision of a factory-autho-
rized installer.
Anyrepairsorreplacementsofdefectivepartsshallbeperformedby
Seller’s authorized service personnel. Seller shall not be respon-
sible for any costs incurred if the work is performed by other than
Seller’s authorized service personnel.
Normal maintenance functions, including lubrication, clean-
ing, or customer abuse, are not covered by this no quibble
warranty.
When returning any part under warranty, the part must be intact and
complete, without evidence of misuse or abuse, freight prepaid.
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 prin-
cipal 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.
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 is exclusive and in lieu of all other
warranties, expressed or implied. There are no implied
warranties of merchantability or of fitness for a particu-
lar purpose.
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 shall be Seller’s sole and exclusive obligation
and Buyer’s sole and exclusive remedy for any action, in-
cluding 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.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF
ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSO-
EVER. SPECIFICALLY THERE ARE NO IMPLIED WARRANTIES
OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
PURPOSE.
This warranty is effective on Middleby Marshall equip-
ment sold on, or after, February 15, 1995.
The foregoing shall be Seller’s sole and exclusive obligation and
Buyer’ssoleandexclusiveremedyforanyaction, whetherinbreach
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
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TABLE OF CONTENTS
Page
Page
SECTION 1 – DESCRIPTION ............................................ 1
I. OVEN USES ............................................................ 1
II. OVEN COMPONENTS ............................................ 1
A. Conveyor Motor Drive ................................... 1
B. Crumb Pans .................................................. 1
C. Conveyor....................................................... 1
D. End Plugs...................................................... 1
E. Eyebrows ...................................................... 1
F. Window ......................................................... 1
G. Machinery Compartment Access Panel ........ 1
H. Serial Plate.................................................... 1
I. Control Panel ................................................ 1
J. Photo Cell ..................................................... 1
K. Gas Burner.................................................... 1
L. Blowers ......................................................... 1
M. Air Fingers..................................................... 1
III. OVEN SPECIFICATIONS ........................................ 2
A. Dimensions ................................................... 2
B. General Specifications .................................. 2
C. Electrical Specifications for
SECTION 3 – OPERATION .............................................. 14
I. LOCATION AND DESCRIPTION OF CONTROLS 16
II. NORMAL OPERATION, STEP-BY-STEP ................ 17
A. Main Screen ................................................ 17
B. Daily Startup Procedure .............................. 18
C. Daily Shutdown Procedure ......................... 18
III. QUICK REFERENCE: TROUBLESHOOTING ...... 19
IV. SCREEN ALERTS ................................................. 19
SECTION 4 – MAINTENANCE ........................................ 20
I. MAINTENANCE – DAILY....................................... 20
II. MAINTENANCE – MONTHLY ............................... 21
III. MAINTENANCE – EVERY 3 MONTHS ................. 22
IV. MAINTENANCE – EVERY 6 MONTHS ................ 23
V. KEY SPARE PARTS KIT ....................................... 24
SECTION 5 – ELECTRICAL WIRING DIAGRAM............ 25
I. WIRING DIAGRAM, 640 GAS OVEN, 208/240V,
50/60 Hz, 1 Ph ....................................................... 25
PS640 Gas Ovens ........................................ 2
D. Gas Orifice and Pressure Specifications
for PS640 Gas Ovens ................................... 2
SECTION 2 – INSTALLATION........................................... 3
I. BASE PAD KIT......................................................... 4
II. INSTALLATION KIT ................................................. 5
III. VENTILATION SYSTEM .......................................... 8
A. Requirements................................................ 8
B. Recommendations ........................................ 8
C. Other Ventilation Concerns ........................... 8
IV. ASSEMBLY .............................................................. 9
A. Base Pad, Legs, Casters .............................. 9
B. Stacking ....................................................... 10
C. Restraint Cable Installation ......................... 10
D. Conveyor Installation .................................. 11
E. Standoff Installation .................................... 11
V. FINAL ASSEMBLY................................................. 12
VI. ELECTRICAL SUPPLY .......................................... 12
Connection ....................................................... 13
VII. GAS SUPPLY ........................................................ 13
A. Gas Utility Rough-In Recommendations ..... 13
B. Connection .................................................. 14
C. Gas Conversion .......................................... 14
D. Propane Conversion ................................... 14
E. Adjusting the Maximum Pressure Setting ... 14
F. Adjusting the Minimum Pressure Setting .... 15
G. Checkout ..................................................... 15
H. Maintenance ............................................... 15
NOTE
Wiring Diagrams are in Section 5 of this Manual.
The diagram for each oven is also on the lower
inner surface of its Control Console.
iv
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SECTION 1 – DESCRIPTION
Figure 1-1. Oven Components
I. OVEN USES
PS640 Series Ovens can be used to bake and/or cook a wide
variety of food products, such as pizza, pizza –type products,
cookies, sandwiches and others.
E
D
J
I
G
II. OVEN COMPONENTS – see Figure 1-1.
A. Conveyor Drive Motor: Moves the conveyor.
B. Crumb Pans: Catch crumbs and other materials that drop
through the conveyor belt. One crumb pan is located at
each end of the conveyor.
C. Conveyor: Moves the food product through the oven.
D. End Plugs: Allow access to the oven’s interior.
F
H
E. Eyebrows: Can be adjusted to various heights to prevent
A
heat loss into the environment.
F. Window: Allows the user to access food products inside
the baking chamber.
C
G. Machinery Compartment Access Panel: Allows access
to the oven’s interior and control components. No user
serviceable parts are located in the machinery compart-
ment.
B
H. Serial Plate: Provides specifications for the oven that
affect installation and operation. Refer to Section 2, Instal-
lation for details.
I. Control Panel: Location of the operating controls for the
oven. Refer to Section 3, Operation, for details.
J. Photo Cell: Turns oven On when beam is interrupted.
Not Shown:
K. Gas Burner (gas ovens): Heat air, which is then projected
to the air fingers by the blowers.
L. Blowers: Projecthotairfromtheburnerorheatingelement
to the air fingers.
M. Air Fingers: Project streams of hot air onto the food
product.
1
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I. OVEN SPECIFICATIONS
Table 1-1 Dimensions
Overall Height
Single Oven
Double Oven
Triple Oven
48-3/16″ (1219mm)
60″ (1524mm)
62-3/4″ (1575mm)
60″ (1524mm)
78-11/16″ (1981mm)
60″ (1524mm)
Overall Depth
Overall Length
76-1/2″ (1930mm)
76-1/2″ (1930mm)
76-1/2″ (1930mm)
Conveyor Width – belt width is 32″
33-1/2″ (838mm)
or 2 × 15″ (381mm)
33-1/2″ (838mm)
or 2 × 15″ (381mm)
33-1/2″ (838mm)
or 2 × 15″ (381mm)
Recommended Minimum Clearances
Rear of Oven to Wall
3″ (76mm)
3″ (76mm)
3″ (76mm)
Control end of conveyor to Wall
Non-control end of conveyor to Wall)
1″ (25.4mm)
1″ (25.4mm)
1″ (25.4mm)
1″ (25.4mm)
1″ (25.4mm)
1″ (25.4mm)
Table 1-2: General Specifications
PS640 GAS
Weight
1150 lbs. (522kg)
Rated Heat Input
120,000 BTU (31,500kcal, 37 kW/hr)
600°F / 315°C
Maximum Operation Temperature
Air Blowers
Two Blowers at 1900 RPM
15 min.
Warmup Time
Table 1-3: Electrical specifications for PS640G gas ovens
Main Blower
Voltage
Control Circuit
Voltage
Phase
Freq
Current
Draw
Poles
Wires
208-240VAC
208-240VAC
1Ph
50/60Hz
11-9.6 Amp
2 Pole
3 Wire (2 hot, 1 gd)
Table 1-4: Gas orifice and pressure specifications for PS640G gas ovens
Gas
Type
Main Orifice I.D.
PS640G
Supply (Inlet)
Pressure
Orifice (Manifold)
Bypass
Pressure
Pressure
Natural
0.120
6-12″ W.C. (14.9 - 29mbar)
3.5″ W.C. (8.7mbar)
10.0″ W.C. (24.9mbar)
0.2″ W.C. (0.015 mbar)
0.5″ W.C. (0.12 mbar)
Propane
1.9mm
11-14″ W.C. (27.4 - 34.9mbar)
IMPORTANT – Additional electrical information is provided on the oven’s serial plate, and on the wiring diagram
inside the machinery compartment.
GAS ORIFICE AND PRESSURE SPECIFICATIONS (PER OVEN CAVITY) - CE OVENS
Supply (Inlet) Pressure
IT,PT,ES,SE,
Main
Orifice
dia.
UK,CH,IT,AT,
DK,FI
I2H
SE,CH,AT,DK,
FI,DE,NL
I3B/P
BE,IE,IT,PT,
ES,UK
I3+
Orifice
(Manifold)
Pressure
Rated
Heat
Input
Gas
Type
NL
I2L
DE
I2E
BE,FR
I2E+
G20
G25
G30
0.120″
20
mbar
--
20
mbar
20
mbar
--
--
--
--
11.21
mbar
22.36
kW-hr.
(3.05 mm)
0.120″
(3.05 mm)
--
25
mbar
--
--
16.19
mbar
22.36
kW-hr.
0.075″
(1.9 mm)
--
--
--
--
29 or 50
mbar
28-30, 37
or 50 mbar
26.2
mbar
22.59
kW-hr.
NOTE
Wiring Diagrams are contained in Section 5 of this Manual
and are also located inside the oven at the
bottom of the Control Panel.
Additional electrical information is provided on the oven's serial plate.
This Manual Must Be Kept For Future Reference
2
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SECTION 2 – INSTALLATION
WARNING – After any conversions, readjustments, or service work on the oven:
• Perform a gas leak test.
• Test for proper combustion and gas supply.
• Test for correct air supply, particularly to the • Check that the ventilation system is in operation.
burner blower.
WARNING - Keep the appliance area free and clear of combustibles.
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: To reduce the risk of fire, the appliance is to be mounted on floors of noncombustible construction with
noncombustible flooring and surface finish and with no combustible material against the underside thereof, or on
noncombustible slabs or arches having no combustible material against the underside thereof, such construction
shall in all cases extend not less than 12 inches (304mm) beyond the equipment on all sides.
CAUTION: For additional installation information, contact your local Authorized Service Agent.
NOTE– Theremustbeadequateclearancebetweentheovenandcombustibleconstruction. Clearancemustalso
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,
mustconformwithanyapplicablelocal, national, orinternationalcodes. Thesecodessupersedetherequirements
and guidelines provided in this manual.
NOTE: In the USA, the oven installation must conform to local codes. In the absence of local codes, gas oven
installations must conform with the National Fuel Gas Code, ANSI Z223.1. Gas and electric ovens, 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: In Canada, the oven installation must conform with local codes. In the absence of local codes, gas
oven installations must conform with the Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Gas
Installation Code, CAN/CGA-B149.2, as applicable. Gas and electric ovens, when installed, must be electrically
grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electrical Code
CSA C22.2.
3
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PS640 OVEN INSTALLATION
REQUIRED KITS AND EQUIPMENT
PS640
Gas Oven
Installation
Kit
PS640
Single Oven
Option Base w/
15″ Legs,
Casters & Top
Kit
PS640
DoubleOven
OptionBase w/
6″ Legs,
Casters & Top
Kit
PS640
TripleOven
OptionBase w/
Casters& Top
Kit
TYPE OF INSTALLATION
P/N51100
P/N59720
P/N59725
P/N59726
PS640 Single Gas Oven
PS640 Double Gas Oven
PS640 Triple Gas Oven
1
2
3
1
1
1
PARTS LIST FOR SERIES PS640 GAS OVEN
INSTALLATION KIT
P/N 51100
(Two required for double oven)
(Three required for triple oven)
ITEM
NO.
QTY
PART NO.
22361-0001
55028
DESCRIPTION
1
2
3
4
5
6
1
1
1
1
1
1
FLEXIBLE GAS HOSE
CONVEYOR END STOP
55027
CONVEYOR LEFT REAR STOP
SERVICE AGENCY DIRECTORY
LABEL, MM
42612
22500-0080
51054
ASSY, HANDLE & DOOR
Figure 2-1. PS640-Series Gas Oven Installation Parts
2
3
1
6
5
4
4
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Figure 2-2. Model PS640 Single Oven
Option Base with Legs and Top
1
8
HARDWARE BAG
5, 6, 7, 10 & 11
3
4
2
9
PARTS LIST FOR PS640 SERIES SINGLE OVEN OPTION - BASE w/15″ LEGS & TOP
P/N 59720
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
37900-0024
22290-0009
22290-0010
220373
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 1″ HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
59560
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
2
7A2S15
5
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Figure 2-3. Model PS640 Double Oven
Option Base with Legs and Top
1
8
HARDWARE BAG
5, 6, 7, 10 & 11
3
4
2
9
PARTS LIST FOR PS640 SERIES DOUBLE OVEN OPTION - BASE w/6″ LEGS & TOP
P/N 59725
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
37900-0102
22290-0009
22290-0010
220373
TOP PLATE, LEG WELDMENT
SWIVEL CASTER W/BRAKE FLAT PLATE
SWIVEL CASTER FLAT PLATE
3/8″-16 × 13 HEX SCREW, SST
3/8″ FLAT WASHER, SS
4
2
5
32
32
32
1
6
21416-0001
21422-0001
22450-0228
59560
7
3/8″ SPLIT LOCK WASHER, ZP
RESTRAINT CABLE ASSEMBLY
TOP COVER
8
9
1
10
11
2
59677
SCR, MS SL TR HD 10-32 × 2-1/2″
SCR, MS STR TRSHD 10-32 × 3/4″
2
7A2S15
6
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Figure 2-4. Model PS640 Triple Oven
Option Base with Outriggers and Top
1
15
HARDWARE BAG
3
7, 8, 9, 10, 11, 12,
13, 14, & 17
5
4
6
2
16
PARTS LIST FOR PS640 SERIES TRIPLE OVEN OPTION - BASE w/CASTERS & TOP
P/N 59726
ITEM NO.
QTY
PART NO.
DESCRIPTION
1
1
60287
COMPLETE BASE WELDMENT
2
3
4
2
45209
22290-0009
22290-0010
45206
QUAD OUTRIGGER WELDMENT
SWIVEL CASTER, W/BRAKE FLAT PLATE
SWIVEL CASTER, FLAT PLATE
INSERT,QUAD ADJUSTMENT FOOT
SPACER,QUAD CASTER
4
2
5
4
6
4
45205
7
32
32
32
16
8
A27727
3/83 -16x1-1/4 HEX BOLT
8
A21924
3/83 FLAT WASHER, SS
9
21422-0001
21172-0004
2001048
A27750
3/83 SPLIT LOCK WASHER, ZP
3/83 -16 NYLON INSULATED LOCKNUT, ZC
1/23 -13 x 1-3/8 18-8 HEX CAPSCREW
1/23 18-8 FLAT WASHER
10
11
12
13
14
15
16
17
8
8
21422-0016
59677
1/23 18-8 LOCK WASHER
2
SCR, MS SL TR HD 10-32X2-1/2
RESTRAINT CABLE ASSEMBLY
TOP COVER
1
22450-0228
59560
1
2
7A2S15
SCR, MS STR TRSHD 10-32X3/4″
7
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B. Recommendations
III. VENTILATION SYSTEM
NOTE THAT THE HOOD DIMENSIONS SHOWN IN
FIGURE 2-5 ARE RECOMMENDATIONS ONLY.
LOCAL, NATIONAL AND INTERNATIONAL CODES
MUST BE FOLLOWED WHEN INSTALLING THE
VENTILATION SYSTEM. ANY APPLICABLE CODES
SUPERSEDE THE RECOMMENDATIONS SHOWN IN
THIS MANUAL.
IMPORTANT
Where national or local codes re-
quire the installation of fire sup-
pression equipment or other
supplementary equipment, DO NOT
mount the
The rate of air flow exhausted through the ventilation system
may vary depending on the oven configuration and hood
design. Consult the hood manufacturer or ventilation engineer
for these specifications.
equipment directly to the oven.
To avoid a negative pressure condition in the kitchen area,
return air must be brought back to replenish the air that was
exhausted. A negative pressure in the kitchen can cause heat-
related problems to the oven components as if there were no
ventilation at all. The best method of supplying return air is
through the heating, ventilation and air conditioning (HVAC)
system. Through the HVAC system, the air can be tempera-
ture-controlled for summer and winter. Return air can also be
brought in directly from outside the building, but detrimental
effectscanresultfromextremeseasonalhotandcoldtempera-
tures from the outdoors.
MOUNTING SUCH EQUIPMENT ON
THE OVEN MAY:
• VOID AGENCY CERTIFICATIONS
• RESTRICT SERVICE ACCESS
• LEAD TO INCREASED SERVICE
EXPENSES FOR THE OWNER
A. Requirements
NOTE: Return air from the mechanically driven system must
not blow at the opening of the baking chamber. Poor
oven baking performance will result.
CAUTION: Gas oven installations REQUIRE a mechani-
cally driven ventilation system with electrical
exhaust air sensing control.
C. Other ventilation concerns
•
Special locations, conditions, or problems may require
the services of a ventilation engineer or specialist.
A mechanically driven ventilation system is STRONGLY
RECOMMENDED for electric oven installations.
•
•
Inadequate ventilation can inhibit oven performance.
PROPER VENTILATION OF THE OVEN IS THE RESPONSI-
BILITY OF THE OWNER.
It is recommended that the ventilation system and duct
workbecheckedatprevailingintervalsasspecifiedbythe
hood manufacturer and/or HVAC engineer or specialist.
Figure 2-5. Ventilation System
18″ (458mm)
minimum
(Typical - both
ends of oven)
3″ (76mm)
minimum
2″ (51mm)
minimum
8″ (203mm)
minimum
8
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Figure 2-6. Leg extension and casters installation
IV. ASSEMBLY
A. Top Panel and Base Pad Assembly
Finished sides of
leg extension face
corner of base
pad
1. Install the four leg extensions onto the base pad using
the 3/8″-16 × 1″ screws, 3/8″ flat washers, and
3/8″ lockwashers supplied in the Base Pad Kit. See
Figure 2-6. Check that the finished sides of each leg
extension face OUTWARDS. One rear leg should be
attached using three 3/8″-16 × 1″ screws and the 3/4″
eyebolt, as shown in Figure 2-6. This eyebolt acts as the
anchor point for the restraint cable assembly (see Part C,
Restraint Cable Installation).
2. If your oven is equipped with the lower shelf, position it in
place as shown in Figure 2-6. Check that the lip on the
shelf faces DOWN. Seal joint between leg and shelf with
NSF listed silicone.
3. Install one caster onto each leg extension, as shown in
Figure 2-7. Use the 3/8″-16 × 1″ screws, 3/8″ flat wash-
ers, and 3/8″ lockwashers supplied in the Installation Kit.
The locking casters should be installed at the FRONT of
the oven. The non-locking casters should be installed at
the REAR of the oven.
Domestic and
standard export
ovens:
Lower
shelf
Locking casters -
FRONT of oven
4. Install the lower oven cavity onto the base pad.
See Fig 2-7.
Non-locking casters -
REAR of oven
5. For single ovens ONLY:
3/8″ flat
Install the top panel using the screws included in the base
pad kit, as shown in Figure 2-8. Then, skip ahead to Part
C, Restraint Cable Installation.
washer
3/8″ lock
washer
For double or triple ovens:
3/8″-16 × 1″
hex screw
Continue on to Part B, Stacking. Note that the top panel
should NOT be installed for double and triple ovens until
after stacking the oven cavities.
Figure 2-7. Base pad Installation
Figure 2-8. Top panel installation
Bottom oven•
cavity
#10-32 × 2-1/2″
Top
screw length
panel
#10-32 × 3/4″
screw length
Assembled•
base pad
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C. Restraint Cable Installation
NOTE: DO NOT install top panel onto double or triple
ovens until AFTER stacking the oven cavities. See
Part B, Stacking.
Because the oven is equipped with casters, a restraint cable
assembly must be installed to limit the movement of the appli-
ance without depending on the connector and the quick discon-
nect device or its associated piping. One end of the cable is
anchored to the eyebolt on the rear surface of the oven’s base
pad, while the other is anchored to the wall. See Figure 2-11.
B. Stacking
For single ovens, skip ahead to Part C, Restraint Cable
Installation.
After connecting the restraint cable, move the oven to its final
location. Adjust the bottom (hex) sections of the feet so that
the casters are off the floor. For quad ovens, lock the two
front casters.
IMPORTANT
Middleby Marshall STRONGLY RECOMMENDS that PS640
Gas oven cavities be stacked BY AUTHORIZED PERSONEL.
Contact your Middleby Marshall Authorized Service Agent for
complete stacking instructions.
Figure 2-10. Top panel installation
1. Stack an oven cavity on top of the lower oven. Check
the following:
#10-32 × 3/4″
Top
screws
panel
• All four sides of the lower lip (on the bottom edge
oftheovencavity)overlapthetopoftheloweroven
#10-32 × 2-1/2″
screws
• The oven is level
• The oven is firmly seated
See Figure 2-9.
2. For triple ovens, repeat Step 1 to install the top
oven cavity.
3. Install the top panel using the screws included in the base
pad kit, as shown in Figure 2-10.
Figure 2-9. Stacking
Figure 2-11. Installing the Restraint Cable
Restraint cable assembly
3/8″-18 × 1″
eyebolt on
rear leg
extension
3/4″ (19mm)
eyebolt
Wall of structure
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D. Conveyor Installation
Figure 2-13. Conveyor placement
1. UnfoldtheconveyorasshowninFigure2-12. Then, begin
to slide the conveyor into the end of the oven. The
conveyor can only be installed from the end of the oven
with the drive motor.
Crumb tray
support
2. Continue moving the conveyor into the oven until the
frame protrudes equally from each end of the oven.
Check that the crumb tray supports located on the under-
side of the conveyor frame rest firmly against the lower
end plugs, as shown in Figure 2-13.
bracket
End plug
3. When the conveyor is positioned properly, check for
freedom of movement of the conveyor belt by pulling it for
about 2-3 feet (0.6-1.0m) with your fingers. The drive and
idler shafts must rotate smoothly, and the belt must move
freely without rubbing on the inside of the oven.
4. Check the tension of the conveyor belt as shown in
Figure 2-14. The belt should lift about 1″ (25mm).
DO NOT OVERTIGHTEN THE CONVEYOR BELT.
Conveyor
placed in
oven
NOTE: If necessary, the belt tension can be adjusted by
turning the conveyor adjustment screws, located at
the idler (non-control) end of the conveyor. See
Figure 2-14.
Figure 2-12. Conveyor installation
Folded
frame
Figure 2-14. Conveyor Belt tension
Idler end (with belt tension
adjustment screws)
1″ (25mm)
vertical
deflection
Adjustment
screws (2) on
idler end of
conveyor
Drive end (with
drive sprocket)
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5. If it is necessary to add or remove conveyor links to
achieve the correct tension, OR if it is necessary to
reverse the conveyor belt for correct orientation, the belt
will need to be removed from the conveyor frame. If this
is necessary, perform the following procedure:
REVERSING THE CONVEYOR BELT
Remove the conveyor from the oven and find the master link
location. Remove master links and remove the belt from the
conveyor frame. Reassemble the belt back onto the frame (in
thereversedirection)andreinstallthemasterlinks.Replacethe
conveyor assembly in the oven.
• Remove the conveyor assembly from the oven and
place it flat on the floor.
RESETTING DIRECTION JUMPER
• Remove the master links using long-nose pliers. Then,
roll up the belt along the length of the conveyor frame.
Locate Jumper P1 on the conveyor control board. Move jumper
from terminals 1 and 2, and replace onto terminals 2 and 3.
• Add or remove belt links as necessary to achieve the
correct belt tension.
CAUTION: Shock hazard in compartments electrical filters
• Replace the belt on the conveyor frame. Check that the
conveyorbeltlinksareorientedasshowninFigure2-15,
and that the smooth side of the conveyor belt faces UP.
are electrically alive.
• Connect the inside master links. Check that the links are
oriented as shown in Figure 2-15.
SWITCHING PHOTO DETECTOR
CAUTION: Disconnect Power Before Switching Photo eye.
• Connect the outside master links. Note that the outside
master links each have an open hook on one side. This
hook aligns with the hooks along the sides of the other
conveyor links. See Figure 2-15.
Remove the three screws securing the access door to the unit.
Open the access door and disconnect the connector fitting to
the photo eye assembly. Remove the two screws securing the
photo eye assembly to the control box. Remove the four nuts
securingthephotoeyetothehousing.Rotatethephotoeye180
degrees and resecure the photo eye with the four nuts.
• Replace the conveyor into the oven.
Figure 2-15. Conveyor and Master Link orientation
Direction
of travel
CORRECT
master link
position
Ontheoppositecontrolbox, removethetwoscrewsholdingthe
cover where the photo eye assembly will be positioned. Secure
the photo eye assembly in position with the two screws. Place
the photo eye cover on the opposite control box, where the
photo eye assembly was removed, and secure the two screws.
Secure the access door with the three screws.
Incorrect
master link
position
Remove the three screws securing the access door on the
opposite side. Open the access door, where the photo eye is
now positioned, and connect the photo eye connector fitting.
Secure the access door with the three screws.
E. Final Assembly
1. Installthecrumbtraysunderneaththeconveyorasshown
in Figure 2-16.
Apply power to the unit. Adjust the photo eye height by loosen-
ingthetwoscrewssecuringthephotoeyeassemblyandsliding
the photo eye assembly either up or down, such that the beam
is approximately 1/4 inch above the belt.
Figure 2-16. Crumb Trays
Note: This is MUCH easier in reduced light.
Replace all covers.
VI. ELECTRICAL SUPPLY
WARNING: Authorized installation personnel normally
accomplish the connections for the ventila-
tion system, electric supply, and gas supply,
asarrangedbythecustomer.Followingthese
connections, the factory-authorized installer
can perform the initial startup of the oven.
Crumb tray
insertion
NOTE: The electric supply installation must satisfy the re-
quirements of the appropriate statutory authority such
as the National Electrical Code, CSA C22.2; the Aus-
tralian Code AG601; or other applicable regulations.
CONVEYOR BELT REVERSAL
Conveyor belt reversal consists of three steps:
1. Physically reversing the conveyor belt.
2. Resetting direction jumper on the conveyor control board.
3. Switching the photo detector.
NOTE: The electric supply connection must meet all national
and local electrical code requirements.
Check the oven serial plate before making any electric supply
connections. Electric supply connections must agree with data
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Figure 2-17. Utility Connection Locations for Gas Ovens
Strain-relief
fitting
Gas Inlet
(One per Single, Double,
or Triple Oven)
Electrical Junction Box
(One per oven cavity)
ontheovenserialplate.Thelocationoftheserialplateisshown
in Figure 1-1 (in Section 1, Description).
VII. GAS SUPPLY
CAUTION: DURINGPRESSURETESTINGNOTEONEOF
A fused disconnect switch or a main circuit breaker (customer
furnished) MUST be installed in the electric supply line for each
oven cavity. It is recommended that the switch/circuit breaker
have Lockout/Tagout capability.
THE FOLLOWING:
1. The oven and its individual shutoff valve must be discon-
nected from the gas supply piping system during any
pressure testing of that system at test pressure in excess
of ½ psi (3.45 kPa).
The supply conductors must be of the size and material
(copper) recommended. Refer to the wiring diagram inside the
machinery compartment of the oven. Electrical specifications
are also listed on the oven’s serial plate and in Table 1-3,
Electrical Specifications (in Section 1, Description).
2. Theovenmustbeisolatedfromthegassupplypipingsystem
by closing its individual manual shutoff valve during any
pressure testing of the gas supply piping system at test
pressure equal to or less than ½ psi (3.45 kPa).
The oven requires a ground connection to the oven ground
screw. For gas ovens, the screw is located in the electrical
junction box (see Figure 2-14). If necessary, have the electri-
cian supply the ground wire. Do NOT use the wiring conduit or
other piping for ground connections.
3. If incoming pressure is over 14″ W.C. (35mbar),
a separate regulator MUST be installed in the line BE-
FORE the individual shutoff valve for the oven.
Incoming electrical power lines are fed through the strain-relief
fitting, shown in Figure 2-14. The electrical supply connections
are made inside the electrical junction box. The power lines
then connect to the oven circuits through safety switches
located inside the machinery compartment and each blower
motor compartment. These switches interrupt electrical power
to the oven when the Machinery Compartment Access Panel is
opened, OR when the rear panel is removed.
WARNING: To prevent damage to the control valve regu-
lator during initial turn-on of gas, it is very
important to open the manual shutoff valve
very slowly.
After the initial gas turn-on, the manual
shutoff valve must remain open except
during pressure testing as outlined in the
above steps or when necessary during
service maintenance.
Connection
Refer to the wiring diagram inside the machinery compartment
of the oven to determine the correct connections for the
electrical supply lines. Connect the supply as indicated on the
wiring diagram.
A. Gas Utility Rough-In Recommendations
The following gas system specifications are STRONGLY
RECOMMENDED. Deviating from these recommendations
may affect the baking performance of the oven.
CAUTION: The terms of the oven’s warranty require all
start-ups, conversions and service work to be
performed by a Middleby Marshall Authorized
Service Agent.
Gas Meter
• One or two cavities: 750 cfh meter
• Three oven cavities: 1200 cfh meter
Gas Line
• DEDICATED LINE from the gas meter to the oven
• 2″ (50.8mm) pipe for natural gas
• 2″ (50.8mm) pipe for propane
• Maximum length: 2002 (61m). Each 90°elbow
equals 7″ (2.13m) of pipe.
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B. Connection
Figure 2-18. Flexible Gas Hose Installation
Check the oven’s gas supply requirements before making the
gas utility connection. Gas supply requirement are listed on the
oven’s serial plate and in Table 1-4. Gas Orifice and Pressure
Specifications (in Section 1, Description).
1/2″ gas
pipe nipple
3/4″-1/2″
gas pipe
reducer
Check the serial plate to determine the type of gas (Propane or
Natural) to be used with the oven.
To Gas
Supply
Pipe
Refer to the instructions in the gas hose package (included
in the Installation Kit) before connecting the gas line. One
gas line connection method is shown in Figure 2-18;
however, compliance with the applicable standards and
regulations is mandatory.
3/4″ gas
pipe nipple
1/2″ gas line
tee with
90°
Elbow
pressure tap
Inlet, regulated, and pilot gas pressure readings can be
taken using a digital tube manometer at the tap location shown
in Figure 2-19. Figure 2-19 shows the burner assembly and
Figure 2-21 shows the gas valve.
Full-Flow
Gas
Shutoff
Valve
NOTE: The installation must conform with local codes or in the
absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1-latest edition.
Individual gas
connection for
each oven
cavity
Flexible
Gas Hose
Quick-
disconnect
device
Certain safety code requirements exist for the installation of gas
ovens;refertothebeginningofSection2foralistoftheinstallation
standards. In addition, because the oven is equipped with cast-
ers, the gas line connection shall be made with a connector that
complies with the Standard for Connectors for Movable Gas
Appliances, ANSI Z21.69 (in U.S.A.), as well as a quick-discon-
nectdevicethatcomplieswiththeStandardforQuick-Disconnect
Devices for Use With Gas Fuel, ANSI Z21.41 (in U.S.A.).
Figure 2-19. Gas Burner Assembly
Gas Burner
C. Gas Conversion
Where permitted by local and national codes, it is possible to
convert ovens from natural to propane gas, or from propane to
natural gas. Use the appropriate Middleby Gas Conversion Kit
for the specific oven model.
CAUTION: The terms of the oven’s warranty require all start-
ups, conversions and service work to be per-
formed by a Middleby Authorized Service Agent.
D. PS640 Propane Conversion
Two items have to be changed, to change the oven to LP:
1. Replace main orifices.
Manifold Pressure Tap
2. Adjust main gas regulator per instructions below.
3. Make sure that the appliance is in operation and the
Moduplus® coil is energized with maximum current.
Disconnect the manifold union closest to the main burner, and
remove the manifold assembly (four screws). Slide out the
manifold assembly (leaving the ignition and sense wires con-
nected). Replace the main orifices.
4. If maximum rate pressure needs adjustment, use an 8 mm
wrench to turn adjustment screw for maximum pressure
setting (clockwise to increase or counter-clockwise to
decrease pressure), until the desired maximum outlet
pressure is obtained.
Replace the main orifices on the manifold assemblies with the LP
units, and replace the manifold assembly. Reconnect the union.
E. Adjusting the Maximum Pressure Setting
5. Disconnect electrical connection of the Moduplus®.
1. Disconnect pressure feedback connection (if appcable).
6. Check minimum pressure setting and readjust if neces-
sary. (See Adjusting Minimum Pressure Setting for
proper adjusting procedure.)
2. Connect a suitable pressure gauge to pipe line or to
outlet pressure tap of gas control concerned, to mea-
sure burner pressure (measuring point must be as near
to burner as possible).
7. Reconnect pressure feedback connection (if appcable).
8. If minimum and maximum pressures are set, wire the
Moduplus® in circuit.
9. Close pressure tap screw.
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F. Adjusting the Minimum Pressure Setting
Figure 2-20. Burner Assembly
1. Disconnect pressure feedback connection (if appcable).
2. Connect a suitable pressure gauge to pipe line or to outlet
pressure tap of gas control concerned, to measure burner
pressure (measuring point must be as near to burner as
possible).
Gas
Valve
3. Disconnect electrical connection of the Moduplus®.
4. Energize operator, set control in operation and wait until
an outlet pressure is recorded on pressure gauge.
5. If minimum rate pressure needs adjustment, use an 8 mm
wrench to turn adjustment screw for minimum pressure
setting (clockwise to increase or counter-clockwise to
decrease pressure), until the desired minimum outlet
pressure is obtained.
6. Check if main burner lights easily and reliable at minimum
pressure.
7. Reconnect pressure feedback connection (if appcable).
8. Close pressure tap screw.
G. Checkout
After any adjustment, set appliance in operation and observe
through a component cycle to ensure that burner system
components function correctly.
Main•
Pressure•
Tap
Main•
Orifices
Manifold
Assembly
H. Maintenance
It is recommended to check yearly the minimum and the
maximum setting and readjust them if necessary.
Figure 2-21. Gas Valve
Adjustment Screw (5 mm)
for minimum pressure
setting
Adjustment Screw
(8 mm) for
maximum
pressure
setting
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SECTION 3 - OPERATION
C. Temperature Control Display
E. Message Bar
Increase
Decrease
A. Main On/Off Button
B. Conveyor Time Setting
D. TEMP Set
Right
Left
LOCATION AND DESCRIPTION OF CONTROLS
C. Temperature Control/Display
A. Main On/Off Button
Displays the set point of the oven.
Turns all oven functions on or off. If the oven is below the set
point, it will rise to the set point and turn the conveyor on. If it is
turned off and the oven is above 200° F, the blowers will remain
on until the oven drops below 200° F.
D. TEMP Set
Pressing on the “TEMP” button shows individual displays and
combined adjustments.
B. Conveyor Time Setting
E. Message Bar
Adjusts and displays the conveyor bake time. Dual belt ovens
have two displays, single units have one.
Indicates various messages pertaining to current oven
conditions.
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NORMAL OPERATION - STEP-BY-STEP
2. Push the “ON/OFF” button to start the oven. The con-
A. Main Screen
troller will display the screen, as shown in Figure 3-3.
1. When the unit has been “OFF” for more than 1 minute
the controller will display the screen saver, as shown in
Figure 3-1. To start operation, push the “Enter/Reset”
button. The controller will display the “OFF” screen, as
shown in Figure 3-2.
Figure 3-3 Main Screen ON
Figure 3-1 Screen Saver
FRONT BELT JAMMED
450 F
BELT 01 SPEED
ON
4m. 30s.
TheMiddleby Corporation
1400Toastmaster Drive
Elgin,IL 60120
Phone:847-741-3300
Fax:
847-741-0015
©2005 Middleby Corporation,All rightsreserved
ON/OFF button
3. To change the temperature, push the “TEMP” button. The
controller will display the screen, shown in
Figure 3-4. To change the temperature, push the “←”
arrow button. Then push either the “↑” arrow or “↓” arrow
buttons to increase or decrease temperatures respec-
tively. When the proper temperature is entered, push the
“Enter/Reset” button. The controller will now show the
display shown in Figure 3-3.
Figure 3-2 Main Screen OFF
The Middleby Corporation
450 F
BELT 01 SPEED
OFF
4m. 30s.
Figure 3-4 Temperature Screen
TEMPERATURE SET UP
ACTUAL TEMP
133.8 F
ON
450.0 F
TEMP Set button
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4. To change the conveyor belt speed, push the “TIME”
button. The controller will display the screen, shown in
Figure 3-5. To change the minute setting, push the “←”
arrow button. Then push either the “↑” arrow or “↓” arrow
buttons to increase or decrease the time accordingly. To
change the second setting, push the “→” arrow button.
Then push either the “↑” arrow or “↓” arrow buttons to
increase or decrease the time accordingly. When the
proper times are entered, push the “ENTER/RESET” but-
ton. The controller will now show the display shown in
Figure 3-3.
C. Daily Shutdown Procedure
1. Make certain there are no products left on the conveyor in
the oven.
2. Press the “ON/OFF” button to turn the oven off.
3. Open the window to allow the oven to cool faster.
4. After the oven has cooled and the blowers have turned off, the
circuit breaker/fused disconnect may be turned off.
Quick Reference – Touch Screen Controller
A. Main Screen
1. ON/OFF button - Used to turn oven On and Off.
2. TIME - See Separate Instructions.
3. TEMP - See Separate Instructions.
Figure 3-5 Belt Speed Screen
Message Bar
4. Energy level indicators - Indicators to either side of the
screen indicate the energy input to that side of the oven.
5. Message bar - Indicates various messages pertaining to
current oven conditions.
BELT 01 SPEED
LEFT FOR MINUTES - RIGHT FOR SECONDS
B. Oven Temperature/Set Point/Indicator Screen
1. Actual temperature - Indicates current average tempera-
ture of the right side of the oven.
4m. 30s.
2. Set point temperature - Pressing on this value allows the
user to adjust the set point of the oven.
3. Exit - Returns to the main screen.
C. Energy Modes
Energy Mode One - This mode is automatic, and starts (bake
time +1 minute) after the last product has entered
theoven. Inthismode, themainovenblowerswilllowerto1200
RPM, while the oven maintains temperature and belt speed.
ON/OFF button
TEMP button
TIME button
B. Daily Startup Procedure
1. Checkthatthecircuitbreaker/fuseddisconnectisintheOn
position. Check that the window is closed. The touch panel
display should be lit.
2. Adjust the conveyor to the desired bake time.
3. Press the temperature button to display the oven setting.
Set temperature as desired.
4. Press the “ON” button to activate the oven. The conveyor
will not run, until the oven temperature has reached the
set points.
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III. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM
PROBLEM
SOLUTION
Oven will not
turn On.
No electrical power
•
Check that the circuit breaker/fused disconnect is on.
Make sure the emergenct stop button is on.
Oven will not
heat.
No gas pressure
•
•
Make sure main gas is on.
Burner did not light
Turn oven off, and restart. If it still does not light, call for
service.
Oven is operating, but
little or no air is coming
from the fingers.
Air fingers may be as-
sembled incorrectly after
cleaning.
•
Turn oven off, and allow to cool. Reassemble fingers
correctly.
Conveyor will not move.
Oven is not up to operating
temperature.
•
•
Allow oven to preheat.
Conveyor may be jammed.
Turn oven off, and allow to cool. Check conveyor for
blockage.
Startup Sensor faulty or
sensor window dirty.
•
•
Clean window.
Sensor requires maintenance, call for service.
IV. SCREEN ALERTS
SYMPTOM
PROBLEM
SOLUTION
Battery Symbol in the
lower right hand corner
The internal battery needs
to be replaced to retain en-
ergy mode timings.
•
A qualified service technician should accomplish this.
High Control Compartment
Temperature
Clean rear grills.
•
Failure to do this will eventually shut down the oven due to
excessive temperature.
Control Over Temp
Front belt jammed
Rear Grills are clogged.
Front belt has stopped.
•
Clean grills.
•
•
Remove obstruction, and restart oven.
If no obstruction, call service.
Rear Belt jammed
High Temp Error
Rear belt has stopped.
•
•
Remove obstruction, and restart oven.
If no obstruction, call service.
Thermocouple or
PLC malfunction.
•
Call service.
Belt off-Oven not
in temperature
Normal operation until
Oven reaches operating
temperature.
Energy Saving Mode 1
Normal operation.
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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.
3. If it is necessary to move a gas oven for cleaning or servicing, disconnect the gas supply before moving 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. If the restraint cable was disconnected to clean or
service the oven, reconnect it at this time.
3. Reconnect the gas supply.
5. Turn on the full-flow gas safety valve. Test the gas
line connections for leaks using approved leak test
substances or thick soap suds.
6. Turn on the electric supply circuit breaker(s).
7. Perform the normal startup procedure.
4. Reconnect the electrical supply.
WARNING
Possibility of injury from moving parts and electrical shock exists in this oven. Switch off and lockout/tagout
the electric supply BEFORE beginning to disassemble, clean, or service any oven. Never disassemble or clean
an oven with the BLOWER ( ) switch or any other circuit of the oven switched on.
CAUTION
NEVER use a water hose or pressurized steam-cleaning equipment when cleaning this oven. To avoid saturating the oven
insulation, DO NOT use excessive amounts of water. DO NOT use a caustic oven cleaner, which can damage the bake
chamber surfaces.
NOTE
ANY replacement parts that require access to the interior of the oven may ONLY be replaced by a Middleby Marshall
Authorized Service Agent. It is also strongly recommended that the 3-Month Maintenance and 6-Month Maintenance
procedures in this section be performed ONLY by a Middleby Marshall Authorized Service Agent.
I. MAINTENANCE - DAILY
Figure 4-1. Cooling Vents and Grills
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
B. Clean ALL of the cooling fan grills and vent openings
with a stiff nylon brush. Refer to Figure 4-1 for the
locations of the grills and vents.
C. Clean the outside of the oven with a soft cloth and mild
detergent.
D. Check that ALL cooling fans are operating properly.
Vents on
front panel
of oven
CAUTION: If a cooling fan is not operating correctly, it must
bereplacedIMMEDIATELY. Operatingtheoven
without adequate cooling can seriously damage
the oven's internal components.
E. Clean the conveyor belts with a stiff nylon brush. This
is more easily accomplished by allowing the conveyor to
run while you stand at the exit end of the conveyor.
Then, brush the crumbs off the conveyor as it moves.
F. Remove and clean the crumb trays. If necessary, refer
to Figure 2-16 (in Section 2, Installation) when replacing
the crumb trays into the oven.
Fan grills (2) on rear
of oven and control
compartment
Vent (1) on rear
of machinery
compartment
G. Clean the window in place.
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Figure 4-2. Removing Air Fingers and Plates
II. MAINTENANCE – MONTHLY
NOTE: When removing the conveyor, refer to Figure 2-12 (in
Section 2, Installation).
A. Check that the oven is cool and the power is disconnected,
as described in the warning at the beginning of this Section.
B. Remove the crumb trays from the oven.
C. Lift the drive end of the conveyor slightly, and push it
forward into the oven. This removes the tension from the
drive chain. Then, remove the drive chain from the con-
veyor sprocket.
D. Slide the conveyor out of the oven, folding it as it is removed.
NOTE: Split belt conveyors can only be removed from the end
of the oven with the drive motor.
Single-belt conveyor assemblies may be removed
from either end of the oven. If it is to be removed from
the end of the oven without drive motor, remove the
drive motor sprocket as described in the Conveyor
Installation instructions (in Section 2, Installation).
Figure 4-3. Disassembling the Air Fingers
E. Remove the end plugs from the oven. The end plugs are
shown in Figure 1-1 (in Section 1, Description).
F. Slide the air fingers and blank plates out of the oven, as
shown in Figure 4-2. AS EACH FINGER OR PLATE IS
REMOVED, WRITE A “LOCATION CODE” ON IT WITH A
MARKER to make sure that it can be reinstalled correctly.
Example of markings:
(Top Row)
T1
T2 T3
T4
T5 T6
(Bottom Row) B1 B2 B3
B4 B5 B6
G. Disassemble the air fingers as shown in Figure 4-3. AS EACH
FINGERISDISASSEMBLED,WRITETHE“LOCATIONCODE”
FOR THE FINGER ON ALL THREE OF ITS PIECES. This will
help you in correctly reassembling the air fingers.
CAUTION: Incorrectreassemblyoftheairfingerswillchange
the baking properties of the oven.
H. Clean the air finger components and the interior of the
baking chamber using a vacuum cleaner and a damp
cloth. Refer to the boxed warnings at the beginning of this
Section for cleaning precautions.
I. Reassemble the air fingers. Then, replace them in the
oven, using the “location guide” as a guide.
J. Replace the end plugs on the oven.
K. Reassemble the conveyor into the oven. If the drive
sprocket was removed when installing the conveyor,
replace it at this time.
L. Reattach the drive chain.
M. Check the tension of the conveyor belt as shown in Figure
2-14 (in Section 2, Installation). The belt should lift
between 3 - 4″ (75-100mm). DO NOT OVERTIGHTEN
THE CONVEYOR BELT. If necessary, the belt tension
can be adjusted by turning the conveyor adjustment
screws, located at the idler (right) end of the conveyor.
N. Replace the crumb trays.
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8. Reassemble the idler shaft into the conveyor. Make
sure that the bronze washer is in place between the
two sections of the shaft. See Figure 4-4.
III. MAINTENANCE – EVERY 3 MONTHS
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
9. Replacetheconveyoradjustmentscrewsasshownin
Figure4-4. Toallowtheconveyorbelttobereinstalled
later, do not tighten the screws at this time.
B. Vacuum both of the blower mounts, and their surrounding
compartments, using a shop vacuum.
10. Loosen the set screw on both of the conveyor drive
sprockets.Then,removethesprocketsfromtheshaft.
C. Tighten all electrical terminal screws.
D. Split Belt Disassembly and Cleaning
11. Check the conveyor configuration as follows:
1. Refer to Part D, Conveyor Installation, in the Installa-
tionsectionofthisManual.Then,removethefollowing
components from the oven:
High-speed conveyors are equipped with large flange
bearings at both ends of the shaft, as shown in
Figure 4-5. For these conveyors, remove the two
screws that hold each bearing to the conveyor frame.
Withthescrewsremoved,lifttheendoftheshaftatthe
front of the oven, and pull the entire assembly free of
the conveyor frame.
• Conveyor end stop
• Crumb trays
• Chain cover
Standard conveyors are equipped with bronze bush-
ings mounted on spacers at both ends of the shaft, as
shown in Figure 4-5. For these convey-ors, remove
the two screws that hold the bracket to the conveyor
frame. With the screws removed, lift the end of the
shaft at the front of the oven, and pull the entire
assembly free of the conveyor frame. The brackets
will be removed along with the drive shaft assembly.
• Drive chains
• End plugs
• Conveyor assembly
2. Remove the master links from each conveyor belt.
Then, rollthebeltsupalongthelengthoftheconveyor
to remove them from the frame.
3. Remove the two conveyor adjustment screws from
the idler end of the conveyor frame, as shown in
Figure 4-4.
12. Disassemble and lubricate the two sections of the
drive shaft as described for the idler shaft, above.
13. Before reassembling the shafts into the conveyor
frame, check that they are oriented properly.
4. Remove the idler shaft assembly from the conveyor.
5. Pull apart the two sections of the idler shaft.
14. Reassemble the drive shaft into the conveyor. Make
sure that the bronze washer is in place between the
two sections of the shaft. See Figure 4-4.
6. Cleantheshaftsthoroughlyusingarag.Then,lubri-cate
both the extended shaft and the interior of the hollow
shaft using a light food-grade lubricant. DO NOT
lubricate the shafts using WD40 or a similar product.
This can cause the shafts to wear rapidly.
15. Replace the drive sprockets. Reassemble the belts
and master links onto the conveyor.
16. Reinstall the end plugs and conveyor onto the oven.
17. Reattach the drive chains. Replace the chain cover.
7. Before reassembling the shafts into the conveyor
frame, check that they are oriented properly.
18. Check the tension of the conveyor belt as shown in
Figure2-14(inSection2,Installation).Thebeltshould
lift about 1″ (25mm). If necessary, adjust the belt
tension by turning the conveyor adjustment screws.
Figure 4-4. Disassembling the idler shaft
19. Replace all components onto the oven.
Figure 4-5. Drive shaft configurations
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Figure 4-7. Rear panel access
Figure 4-6. Disassembling the drive shaft
Remove eight (8)
screws to remove
rear panel
Bearings
(2 total)
Grease fitting
(1 per
bearing)
Blower belt
Blower motor
Loosen four (4) screws to adjust
motor position and belt tension
E. Blower Belt
IV. MAINTENANCE - EVERY 6 MONTHS
1. Remove the six screws shown in Figure 4-7. Then,
remove the rear panel from the oven.
A. Check that the oven is cool and the power is discon-
nected, as described in the warning at the beginning of
this Section.
2. Check the blower belt for the proper 1/4″ (6mm) deflec-
tion at the center, and for cracking or excessive wear.
B. Check for excessive wear on the conveyor drive motor
brushes. The brushes should be replaced if they have
worn to less than 1/4″ (6mm) in length. Be sure to replace
the brushes in exactly the same position.
See Figure 4-7. Overtightening the belt will cause premature
bearing failure and possible vibrations. A loose belt may also
cause vibrations.
3. If necessary, adjust the tension of the belt by loosening
the four motor mounting bolts. Reposition the motor as
neccessary until the correct 1/4″ (6mm) deflection is
reached, then tighten the bolts.
C. For gas ovens, inspect and clean the burner nozzle and
the spark electrode assembly.
D. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
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V. KEY SPARE PARTS – Available separately. See Figure 4-8.
1
2
3
4
5
10
16, 17, 18
22
23
19
20
21
Figure 4-8. Key Spare Parts
KEY SPARE PARTS PS640 GAS (B & W Touchscreen)
ITEM QTY.
P/N
DESCRIPTION
1
2
1
1
1
1
1
1
1
1
1
60191
58920
58679
60192
M9608
60196
97525
51399
50610
57288
50239
60679
60671
33983
32108
60193
58668
58669
60091
59132
59668
48455
50240
Digital Display, Programmed
Motor, Conveyor Drive
Conveyor Control Board
Inverter, Programmed
Power Supply
3
4
5
6
Kit, Thermocouple
7
Fan Cooling Control
Fan Cooling Rear
8
9
Air Switch
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
Motor, Blower
1
1
1
1
2
1
1
1
1
2
1
1
1
Ignition Module
Assy, Valve Gas Modulating
Board, Signal Cond. 0-15VDC
High Limit Control Module,240V
Transformer,240Vp:24Vs
PLC ModuIe, Programmed
Thermocouple Module
Current Module
PhotoCell
Relay, DPDT 24V Coil
Belt, Blower
Ignitor, Single Rod
Ignition Cable, 25″
24
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SECTION 5 - WIRING DIAGRAM
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NOTES
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NOTES
27
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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
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