Middleby Marshall PS500 Series Manual

ENGLISHFRANÇAISESPAÑOL page 1page 21página 41
1
Middleby Cooking Systems Group  1400 Toastmaster Drive  Elgin, IL 60120  [phone]  FAX [phone]
OWNER'S OPERATING
& INSTALLATION
MANUAL
© 2000 Middleby Marshall, Inc.
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
PS500 Series Gas Ovens
PS500 Series
Gas (CSA)
ENGLISH/French/Spanish
P/N 42461
Rev. B  V1  1/00
Models:
 PS555
 PS570S
Combinations:
 Single Oven
 Double Oven (Two-Stack)
 Triple Oven (Three-Stack)
 Quad Oven (Four-Stack)

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ENGLISH
MiddlebyCookingSystemsGroup1400ToastmasterDriveElgin,IL60120USA[phone]FAX[phone]
24-Hour Service Hotline: [phone]
www.middleby.com
NOTICE:
This Owner's Operating and Installation Manual should be given to the user. The operator of the oven should
be familiar with the functions and operation of the oven.
This manual must be kept in a prominent, easily reachable location near the oven.
Gas ovens are designed for use with EITHER natural gas OR liquid propane gas, as specified on the serial plate.
Where permitted by local and national codes, the oven can be converted from natural gas to propane operation,
or from propane to natural gas operation. This conversion requires the installation of the appropriate Middleby
Marshall Gas Conversion Kit by an Authorized Service Agent.
It is suggested to obtain a service contract with a Middleby Marshall Authorized Service Agent.
WARNING
POST,IN A PROMINENT LOCATION, THE EMERGENCY TELEPHONENUMBER OF YOUR LOCAL GAS
SUPPLIER AND INSTRUCTIONS TO BE FOLLOWED IN THE EVENT YOU SMELL GAS.
Instructions to be followed in the event the user smells gas shall be obtained by consulting the local gas
supplier. If the smell of gas is detected, immediately call the emergency phone number of your local Gas
Company. They will have personnel and provisions available to correct the problem.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors or 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,
operating and maintenance instructions thoroughly before installing
or servicing this equipment.
NOTICE: CONTACTYOURMIDDLEBYMARSHALLAUTHORIZEDSERVICEAGENTTOPERFORMMAINTENANCE
AND REPAIRS. AN AUTHORIZED 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.
NOTICE: Theequipmentwarrantyisnotvalidunlesstheovenisinstalled,startedanddemonstratedunder thesupervision
of a factory certified installer.
IMPORTANT
An electrical wiring diagram for the oven is located inside the machinery
compartment.
IMPORTANT
It is the customer's responsibility to report any concealed or non-concealed damage
to the freight company. Retain all shipping materials until it is certain that the
equipment has not suffered concealed shipping damage.
Retain This Manual For Future Reference

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SECTION1-DESCRIPTION ................................................... 4
I. OVEN USES ............................................................. 4
II. OVEN COMPONENTS ............................................. 4
A. Conveyor Drive Motor ....................................... 4
B. Crumb Pans ..................................................... 4
C. Conveyor End Stop ........................................... 4
D. Conveyor Rear Stop ......................................... 4
E. Conveyor ........................................................... 4
F. End Plugs ......................................................... 4
G. Eyebrows .......................................................... 4
H. Window ............................................................. 4
I. Serial Plate ....................................................... 4
J. Machinery Compartment Access Panel .......... 4
K. Control Panel .................................................... 4
L. Gas Burner ....................................................... 4
M. Blowers............................................................. 4
N. Air Fingers ........................................................ 4
III. OVEN SPECIFICATIONS ......................................... 4
A. Dimensions ...................................................... 4
B. General Specifications ..................................... 4
C. Gas Orifice and Pressure Specifications ........ 4
E. Electrical Specifications ................................... 4
SECTION 2- INSTALLATION .................................................. 5
I. INSTALLATIONKIT .................................................. 5
II. BASE PAD KIT .......................................................... 6
III. VENTILATIONSYSTEM ........................................... 7
A. Requirements .................................................. 7
B. Recommendations .......................................... 7
C. Other Ventilation Concerns .............................. 7
TABLE OF CONTENTS
IV. ASSEMBLY ............................................................... 8
A. Base Pad, Legs, Casters, and Stacking ......... 8
B. Restraint Cable Installation ............................. 8
C. Conveyor Installation ........................................ 8
V. FINAL ASSEMBLY ................................................... 10
VI. ELECTRICAL SUPPLY ........................................... 10
VII. GAS SUPPLY .......................................................... 11
A. Connection ...................................................... 11
B. Gas Conversion .............................................. 11
SECTION3 -OPERATION ..................................................... 12
I. LOCATION AND DESCRIPTION OF CONTROLS .12
A. BLOWER ( ) Switch ...................................... 12
B. HEAT ( ) Switch ............................................ 12
C. CONVEYOR ( ) Switch ............................... 12
D. Conveyor Speed Controller ............................. 12
E. Digital Temperature Controller ....................... 12
F. Machinery Cpt. Access Panel Safety Switch ..12
II. NORMAL OPERATION, STEP-BY-STEP ................ 13
A. Daily Startup Procedures ................................ 13
B. Daily Shutdown Procedures ........................... 13
III. QUICK REFERENCE: DIGITAL TEMP CONTROL. 14
IV. QUICK REFERENCE: TROUBLESHOOTING ....... 15
SECTION4 -MAINTENANCE ................................................. 16
I. MAINTENANCE - DAILY .......................................... 16
II. MAINTENANCE - MONTHLY .................................. 17
III. MAINTENANCE - EVERY 3 MONTHS .................... 18
IV. MAINTENANCE - EVERY 6 MONTHS .................... 19
V. KEY SPARE PARTS KIT ......................................... 20
page page

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SECTION 1 - DESCRIPTION
II. OVEN COMPONENTS - see Figure 1-1.
A. Conveyor Drive Motor: Moves the conveyor.
B. Crumb Pans: Catch crumbs and other material that drop
through the conveyor belt. One crumb pan is located at
each end of the conveyor.
C,D. ConveyorEnd StopandRear Stop: Preventsfood products
from falling off the end or rear of the moving conveyor.
E. Conveyor: Moves the food product through the oven.
F. End Plugs: Allow access to the oven's interior.
G. Eyebrows: Can be adjusted to various heights to prevent
heat loss into the environment.
H. Window: Allows the user to see and access food products
inside the baking chamber.
I. Machinery Compartment Access Panel: Allows access
to the oven's interior and control components. No user-
servicable parts are located in the machinery compart-
ment.
I. OVEN USES
PS500 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.
J. Serial Plate: Provides specifications for the oven that affect
installation and operation. Refer to Section 2, Installation,
for details.
K. Control Panel: Location of the operating controls for the
oven. Refer to Section 3, Operation, for details.
Not Shown:
L. Gas Burner: Heats air, which is then projected to the air
fingers by the blowers.
M. Blowers: Project hot air from the burner to the air fingers.
N. Air Fingers: Project streams of hot air onto the food product.
Figure 1-1 - Oven Components
Single Oven Double Oven Triple Oven Quad Oven
Table 1-1: Dimensions PS555 PS570S PS555 PS570S PS555 PS570S PS555 PS570S
Overall Height 46-1/8 46-1/8 60-1/8 60-1/8 62-1/2 62-1/2 78 78
(inc. top and legs, as appropriate) 1172mm 1172mm 1527mm 1527mm 1588mm 1588mm 1981mm 1981mm
Overall Depth 63-3/8 63-3/8 63-3/8 63-3/8 63-3/8 63-3/8 63-3/8 63-3/8
(inc. rear shrouds) 1610mm 1610mm 1610mm 1610mm 1610mm 1610mm 1610mm 1610mm
Overall Length 91 106 91 106 91 106 91 106
2311mm 2692mm 2311mm 2692mm 2311mm 2692mm 2311mm 2692mm
Conveyor Width 32 32 32 32 32 32 32 32
813mm 813mm 813mm 813mm 813mm 813mm 813mm 813mm
Recommended Minimum Clearances
Rear of Oven (inc. rear shrouds) to Wall 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm)
Conveyor Extension to Wall (both ends) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm) 0 (0mm)
Table 1-2: General Specifications (per oven cavity) PS555 PS570S
Weight 900 lbs. (408.6kg) 1400 lbs. (634kg)
ShippingWeight 1250 lbs. (567.5 kg) 1750 lbs. (780kg)
ShippingCube 160.3 ft
3
(4.5m
3
) 160.3 ft.
3
(4.57m
3
)
Rated Heat Input 135,000 BTU (34,020 kcal, 40 kW/hr) 170,000 BTU (42,840 kcal, 50 kW/hr)
MaximumOperating Temperature < - - - - - - - - - 550°F / 288°C - - - - - - - - - >
Air Blowers Two blowers at 1400 ft.
3
/min. (39.6m
3
/min.) at 2050 RPM, 0.40" (1.0cm) Water Static Pressure
Average Air Jet Velocity < - - - - - - - - - 2600 ft./min. (1320cm/sec.) average - - - - - - - - - >
WarmupTime < - - - - - - - - - 15 min. - - - - - - - - - >
Table 1-3: Gas orifice and pressure specifications (per oven cavity)
Main Orifice Main Orifice Orifice (Manifold)
Gas Type I.D. - PS555 I.D. - PS570S Pilot Orifice I.D. Supply (Inlet) Pressure Pressure
Natural 0.219(5.56mm) 0.250 (6.35mm) 0.028 (0.71mm) 6-12 W.C. (14.9-29.9mbar) 3.5 W.C. (8.7mbar)
Propane 0.134(3.40mm) 0.152 (3.86mm) 0.018(0.46mm) 11-14W.C. (27.4-34.9mbar) 10 W.C. (24.9mbar)
Table 1-4: Electrical specifications (per oven cavity)
Main Blower Voltage Control Circuit Voltage Phase Freq Current Draw Poles Wires
208-240V 120V conveyor speed controller (w/transformer); 1 Ph 50/60Hz 12A 2 Pole 3 Wire (2 hot, 1 gd)
all other control circuits as per line (208-240V)
IMPORTANT: Additional electrical information is provided on the oven's serial plate, and on the wiring diagram inside the
machinery compartment.
III. OVEN SPECIFICATIONS
C
BA
EFG H
J
I
K
D

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SECTION2- INSTALLATION
WARNING
Keep the appliance area free and clear of combustibles.
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.
CAUTION
For additional installation information, refer to the PS570 Pre-Installation Procedures Manual
(Middleby Marshall P/N 88211-0002), or 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 and national codes. These codes supercede the requirements and
guidelines provided in this manual.
NOTE
In U.S.A., the oven installation must conform with local codes, or in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1. The oven, when installed, must be electrically grounded in accor-
dance 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, or in the absence of local codes, with the
Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Gas Installation Code, CAN/CGA-B149.2,
as applicable. The oven, 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, as applicable.
Fig. 2-1 - Installation Kit
I. INSTALLATION KIT - see Figure 2-1
NOTE: One Installation Kit is required for each oven cavity.
Item Qty. Part No. Description
1 1 35900-0148 Conveyor Rear Stop
2 1 35000-1103 Conveyor End Stop
3 1 33120-0053 Gas Pipe Nipple
4 1 42461 Owner's Operating Manual
5 1 1002040 Authorized Svc. Agency Listing
45
2
13
NOTE
For Australian installation, the oven installation must conform with AGA Code, AG601, and with any require-
ments of the appropriate statutory authority.

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SECTION2 - INSTALLATION
Fig. 2-2 - Base Pad Kit
II. BASE PAD KIT - see Figure 2-2
NOTE: One Base Pad Kit is required for each Single, Double, Triple, or Quad Oven installation.
Quantity
Doubleoven Doubleoven
Item Singleoven w/10"legs w/15"legs Tripleoven Quadoven Part No. Description
1 4 -- -- -- -- 37210-0060 Leg, 19 (483mm)
1 -- 4 -- -- -- 37210-0082 Leg, 10 (254mm)
1 -- -- 4 -- -- 37210-0057 Leg, 15 (381mm)
2 -- -- -- -- 4 37210-0054 Outrigger
34444--37115-0102 Caster, Swivel (with stud)
4 -- -- -- -- 2 22290-0010 Caster, Swivel (with flat plate)
5 -- -- -- -- 2 22290-0009 Caster, Swivel (with flat plate and brake)
62222227271-0004 Pipe Clamp, 1-1/2
72222233120-0055 Nipple, 1-14 dia. X 3 (76mm) L, NPT
82222223122-0007 Elbow, 90°, 1-1/4 dia.
91111122361-0003 Gas Hose, 1-1/4 dia. X 72 (1829mm) L
104444--22450-0028 Adjustable Leg
111111133120-0056 Gas Pipe, 1-1/4 dia. X 54 (1372mm) L
121111122450-0253 Restraint Cable, 60 (1524mm)
131111121392-0005 Eye Bolt/Lag Screw
1422222 41582 Top Cover (Right or Left) - PS555
1422222 42431 Top Cover (Right or Left) - PS570S
--11111 41643 Base Pad, Insulated - PS555
--11111 41714 Base Pad, Insulated - PS570S
--8888821256-0069 Screw, 10-32 X 1-1/4 Sl Trus Hd
--2222221292-0001 Screw, 10-16 X 3/4 Hex Wshr Hd #2pt
-- 16 16 16 -- 8 21216-0018 Bolt, 1/2-13 X 1-1/4 Hex Cap
-- 16 16 16 -- 8 21416-0003 Flat Washer, 1/2
-- 16 16 16 -- 8 21426-0004 Lock Washer, 1/2
-- -- -- -- -- 16 220373 Bolt, 3/8-16 X 1 Hex Cap
-- -- -- -- -- 16 21416-0001 Flat Washer, 3/8
-- -- -- -- -- 16 21422-0001 Lock Washer, 3/8"
1
2
3
4
5
6
7
8
9
10
11
12
13
14

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18 (458mm)
minimum
(Typical - both
ends of oven)
3 (76mm)
minimum
8 (203mm)
minimum
2 (51mm)
minimum
B. Recommendations
NOTE THAT THE HOOD DIMENSIONS SHOWN IN FIGURE 2-
3 ARE RECOMMENDATIONS ONLY. LOCAL AND NATIONAL
CODES MUST BE FOLLOWED WHEN INSTALLING THE
VENTILATION SYSTEM. ANY APPLICABLE LOCAL AND
NATIONAL CODES SUPERSEDE THE RECOMMENDATIONS
SHOWN IN THIS MANUAL.
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.
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 temperature-
controlled for summer and winter. Return air can also be
brought in directly from outside the building, but detrimental
effects can result from extreme seasonal hot and cold
temperatures from the outdoors.
NOTE: Return air from the mechanically driven system must not
blow at the opening of the baking chamber. Poor oven baking
performance will result.
C. Other ventilation concerns
 Special locations, conditions, or problems may require the
services of a ventilation engineer or specialist.
 Inadequate ventilation can inhibit oven performance.
 It is recommended that the ventilation system and duct
work be checked at prevailing intervals as specified by the
hood manufacturer and/or HVAC engineer or specialist.
A. Requirements
CAUTION
A mechanically driven ventilation system is REQUIRED for gas
oven installations.
PROPER VENTILATION OF THE OVEN IS THE
RESPONSIBILITY OF THE OWNER.
III. VENTILATION SYSTEM
IMPORTANT
Where national or local codes require the
installation of fire suppression equip-
ment or other supplementary equipment,
DO NOT mount the equipment directly to
the oven.
MOUNTING SUCH EQUIPMENT ON
THE OVEN MAY:
 VOID AGENCY CERTIFICATIONS
 RESTRICT SERVICE ACCESS
 LEAD TO INCREASED SERVICE EX-
PENSES FOR THE OWNER
SECTION2 - INSTALLATION
Fig. 2-3 - Ventilation System

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SECTION2 - INSTALLATION
IV. ASSEMBLY
A. Base Pad, Legs, Casters, and Stacking
NOTE: Optional Stacking Lift Kit (P/N 30580)
The Stacking Lift Kit, P/N 30580, is available separately. This
Kit provides a complete lift adapter set, specifically designed for
stacking PS500 Series oven cavities. The Kit includes an
instructional videotape.
1. Install the top panels in place on the top oven cavity. Follow
the instructions provided with the top panels.
2a. Legs/Casters Installation - Single and Double Ovens
 Install one leg extension to each corner of the base pad
using the 1/2"-13x1-1/4" bolts, 1/2" flat washers, and
1/2" lockwashers supplied in the Installation Kit. See
Figure 2-4.
 Install one adjustable leg and one caster into the holes
on the bottom of the leg extension. The adjustable leg
should be installed into the OUTSIDE hole (closest to
the front or rear face of the oven). The caster should be
installed into the INSIDE hole.
2b. Legs/Casters Installation - Triple Ovens
Install one adjustable leg and one caster into the 3/4" holes
on the bottom of the base pad, as shown in Figure 2-5. The
adjustable leg should be installed into the OUTSIDE hole
(closest to the front or rear face of the oven). The caster
should be installed into the INSIDE hole.
2c. Legs/Casters Installation - Quad Ovens
 Install one outrigger to each corner of the base pad
using the 1/2"-13x1-1/4" bolts, 1/2" flat washers, and
1/2" lockwashers supplied in the Installation Kit. See
Figure 2-6.
 Install the casters onto the outriggers using the 3/8"-
16x1" screws, 3/8" flat washers, and 3/8" lockwashers
supplied in the Installation Kit. The two locking casters
should be installed on the front side of the oven.
3. Install the base pad onto the lower oven cavity. Check that
the eyebolt welded onto the pad faces the rear of the oven.
4. Stack the oven cavities. Ifnecessary, refer to the instructional
videotape provided with the Stacking Lift Kit (P/N 30580).
B. Restraint Cable Installation
Because the oven is equipped with casters, a restraint cable
assembly must be installed to limit the movement of the
appliance without depending on the connector and the quick
disconnect 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 2-7.
After connecting the restraint cable, move the oven to its final
location. For single, double, and triple ovens, adjust the 6
(152mm) legs so that the casters are off the floor. For quad
ovens, lock the two front casters.
C. ConveyorInstallation
NOTE
Split belt conveyors can only be installed from the end of the
oven with the drive motor.
Single-belt conveyor assemblies may be inserted into either
end of the oven. If it is to be installed from the end of the oven
without the drive motor, the drive sprocket assembly must be
removed.
To remove the drive sprocket (if necessary), loosen the set
screw on the conveyor collar as shown in Figure 2-8. Then, pull
the sprocket assembly straight out.
Figure 2-4 - Legs and Casters for Single or Double Oven
Front or Rear
of oven
Left or Right Side
of oven
1/2"
flat washer
Leg uses OUTSIDE
hole (closest to front
or rear of oven)
Caster
uses
INSIDE
hole
Figure 2-6 - Legs and Casters for Quad Oven
1/2"
lock
washer
1/2"-13 x 1-1/4"
hex screw
Figure 2-5 - Legs and Casters for Triple Oven
Front or Rear
of oven
Left or Right Side
of oven
Leg uses OUTSIDE
hole (closest to front
or rear of oven)
Caster uses
INSIDE hole
1/2" flat
washer
1/2" lock
washer
1/2"-13 x 1-1/4"
hex screw
3/8"-16 x 1"
hex screw
3/8" lock
washer
3/8" flat
washer
Locking casters -
FRONT of oven
Non-locking casters -
REAR of oven
Front or Rear
of oven
Left or Right Side
of oven

9
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SECTION2 - INSTALLATION
Figure 2-10 - Checking the conveyor tension
3-4" (75-100mm)
vertical deflection
Conveyor
tension
adjustment
screws (idler
end only)
Eyebolt in
base pad
Rear surface
of oven base
pad
Restraint cable
assembly
3/4 (19mm)
eyebolt
Wall of
structure
Figure 2-7 - Installing the Restraint Cable
Figure 2-9 - Inserting the Conveyor
1
2
3
Figure 2-8 - Removing the Conveyor Drive Sprocket
Loosen conveyor collar
set screw, then pull
sprocket straight out
Figure 2-11 - Conveyor and Master Link Orientation
Direction
of travel
Outside master link
orientation
CORRECT
master link
position
Incorrect
master link
position
1. Lift the conveyor and position it in the oven as shown in
Figure 2-9.
2. Continue moving the conveyor into the oven until the frame
protrudes equally from each end of the oven (about 18"/
457mm).
3. Check that the retainers located on the underside of the
conveyor frame rest firmly against the lower end plugs, as
shown in Figure 2-9.
4. When the conveyor is positioned properly, check for free-
dom of movement of the conveyor belt by pulling it for about
2-3 feet (60 to 90 cm) with your fingers. The conveyor must
move freely.
5. If the drive sprocket was removed when installing the
conveyor, replace it at this time.
6. Install the drive chain between the conveyor drive sprocket
and the motor sprocket. To install the chain, it will be
necessary to lift the drive end of the conveyor slightly.
7. Install the conveyor drive motor cover.
8. Check the tension of the conveyor belt as shown in Figure
2-10. The belt should lift between 3-4" (75-100mm). DO
NOT OVERTIGHTEN THE CONVEYOR BELT.
NOTE:
If necessary, the belt tension can be adjusted by turning the
conveyor adjustment screws, located at the idler (right) end
of the conveyor. See Figure 2-10.
9. If necessary, links can be added to or removed from the
conveyor belt to achieve the correct deflection of 3-4" (75-
100mm). If links must be removed from the belt, it can be
reattached to the conveyor as follows:
a. The conveyor belt links must be oriented as shown in
Figure 2-11.
b. The smooth side of the conveyor belt must face UP.
c. Connect the inside master links. Check that the links
are oriented as shown in Figure 2-11.
d. Connect the outside master links. Note that the
outside master links have right and left sides. The
right-side master link has an open hook facing you, as
shown in Figure 2-11.
e. Check for freedom of movement of the conveyor belt by
pulling it for about 2-3 feet (60 to 90 cm) with your
fingers. The conveyor must move freely.
f. Return to Step 8, above, to re-check the belt tension.
Inside master link
orientation
Retainer
4
End plug

10
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SECTION2 - INSTALLATION
Figure 2-13 - Utility Connection Locations
Electrical
Junction Box
One per oven cavity
VI. ELECTRICAL SUPPLY
WARNING
Authorized supplier personnel normally accomplish
the connections for the ventilation system, electric supply,
and gas supply, as arranged by the customer. Following
these connections, the factory-authorized installer can
perform the initial startup of the oven.
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.
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
on the oven serial plate. The location of the serial plate is shown
in Figure 1-1 (in Section 1, Description).
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 this switch/circuit breaker
have lockout/tagout capability.
The supply conductors must be of the size and material (cop-
per) 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 1-4,
Electrical Specifications (in Section 1, Description).
The oven requires a ground connection to the oven ground
screw located in the electrical junction box. (The box is shown
in Figure 2-13.) If necessary, have the electrician supply the
ground wire. Do NOT use the wiring conduit or other piping for
ground connections!
All electric supply connections are made via the electrical
junction box on the rear of the oven, shown in Figure 2-13. 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 electric
power to the oven when the Machinery Compartment Access
Panel is opened, OR when either of the blower or rear shrouds
is removed.
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. Be sure to connect the electrical supply ground wire
to the oven ground screw located in the junction box on the rear
of the oven.
Gas Inlet
One per Single, Double,
Triple, or Quad Oven
Figure 2-14 - Flexible Gas Hose Installation
To Gas
Supply Pipe
90°
Elbow
Union OR quick-
disconnect device
Flexible
Gas Hose
Full-Flow
Gas
Shutoff
Valve
90°
Elbow
Figure 2-12 - Crumb trays
Crumb trays
with slots
Lower oven
cavity ONLY
All upper oven
cavities
Crumb trays
without slots
V. FINAL ASSEMBLY
1. Refer to Figure 2-12 to determine the correct locations of
the crumb trays.
2. Install the crumb trays underneath the conveyor as shown
in Figure 2-12. First, place the inside edge of the tray onto
the retainer (shown in Figure 2-9). Then, swing the outside
edge of the tray up and into place.
3. Press the conveyor end stop and rear stop down over the
edge of the conveyor frame. See Figure 1-1 (in Section 1,
Description).

11
ENGLISH
SECTION2 - INSTALLATION
VII. GAS SUPPLY
A. Connection
Check the ovens gas supply requirements before making the
gas utility connection. Gas supply requirements are listed on
the ovens serial plate and in Table 1-3, Gas Orifice and
Pressure Specifications (in Section 1, Description).
Check the serial plate to determine the type of gas (Propane or
Natural) to be used with the oven.
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 2-14; however,
compliance with the applicable standards and regulations is
mandatory.
CAUTION
DURINGPRESSURETESTINGNOTEONEOFTHEFOLLOW-
ING:
1. The oven and its individual shutoff valve must be
disconnectedfromthegas supply piping system during
any pressure testing of that system at test pressure in
excess of 1/2 psi (3.45 kPa).
2. The oven must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
systemattest pressure equal to orlessthan 1/2 psi (3.45
kPa).
3. If incoming pressure is over 14 W.C. (35mbar), a
separateregulator MUST beinstalledin the lineBEFORE
the individual shutoff valve for the oven.
WARNING: To prevent damage to the control valve
regulatorduring initialturn- onof gas,itis veryimportant
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.
Inlet, regulated, and pilot gas pressure readings can be taken
using a U tube manometer at the tap locations shown in Figure
2-15. One 90° elbow equals a 7 (2.13m) length of pipe. The
recommended pipe sizes are larger than usually required to
eliminate any operation problems. It is much less expensive
to make the initial installment large enough to do the job rather
than redoing the job later.
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.
In Australia, the installation must conform with AGA Code
AG601 and with any requirements of the appropriate statutory
authority.
CANADIAN:
CAN/CGA-B 149.1 Natural Gas Installation Code
CAN/CGA-B 149.2 Propane Installation Code
Certain safety code requirements exist for the installation of gas
ovens; refer to the beginning of Section 2 for a list of the
installation standards. In addition, because the oven is equipped
with casters, 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.), or, if appli-
cable, Connectors for Movable Gas Appliances, CAN/CGA-6.16
(in Canada), as well as a quick-disconnect device that complies
with the Standard for Quick-Disconnect Devices for Use With
Gas Fuel, ANSI Z21.41 (in U.S.A.), or, if applicable, Quick-
Disconnect Devices for Use With Gas Fuel, CAN1-6.9 (in
Canada).
B. GasConversion
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 Marshall Gas
Conversion Kit for the specific oven model.
CAUTION
The terms of the oven's warranty require all start-ups, conver-
sions and service work to be performed by a Middleby Marshall
Authorized Service Agent.
Figure 2-15 - Gas Burner and Piping Assembly
Modulating
gas valve
Pilot pressure tap
(where pilot gas
pressure is measured)
Combination Gas
Control Valve
(Safety Regulator)
Gas Burner
BurnerBlower
Inlet pressure
tap (where
incoming gas
pressure is
measured)
Manifold
pressure tap
(where manifold
gas pressure is
measured)
On/Off Knob
Always leave in
ON position
Manual
shutoff
valve
Gas line for
other oven
cavities Cap for top
oven cavity
Nipple, 1-1/4
dia. X 3
(76mm) L, NPT
Elbow, 90°,
1-1/4 dia.
Gas Pipe, 1-1/4
dia. X 54
(1372mm) L

12
ENGLISH
SECTION 3 - OPERATION
I. LOCATION AND DESCRIPTION OF CONTROLS
Fig. 3-1 - Control Panel
"BLOWER" Switch: Turns the blowers and
cooling fans on and off. The HEAT Switch has
no effect unless the BLOWER Switch is in the
ON position.
A.
"HEAT" Switch: Allows the gas burner to light.
Activation of the gas burner is determined by the
settings on the Digital Temperature Controller.
"CONVEYOR"Switch: Turns theconveyor drive
motor on and off.
B.
C.
D.
E.
Conveyor Speed Controller: Adjusts and dis-
plays the bake time. Single-belt ovens have one
controller. Split belt ovens have one controller
for each conveyor belt, labeled "FRONT" and
"BACK."
Digital Temperature Controller: Continuously
monitors the oven temperature. Settings on the
Digital Temperture Controller control the activa-
tion of the gas burner.
A.
"BLOWER"
( ) switch
E.
Digital Temperature
( ) controller
D.
Conveyor Speed
( ) controller(s)
NOT SHOWN:
F. Machinery Compartment AccessPanelSafety Switches:
Disconnect electrical power to the controls and the blowers
when the machinery compartment access panel is opened.
The panel should only be opened by authorized service
personnel.
B.
"HEAT"
( ) switch
C.
"CONVEYOR"
( ) switch

13
ENGLISH
CAUTION
In case of power failure, turn all switches to the OFF ("O")
position, open the oven window, 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, WAIT FOR AT LEAST FIVE
MINUTES BEFORE RESTARTING THE OVEN.
Theburnerwill not operate and gaswillnot flow through
theburnerwithout electric power. No attempt shouldbe
made to operate the oven during a power failure.
IMPORTANT
On gas ovens, if the "HEAT ON" light will not illuminate, OR
if the oven does not heat, the gas burner may not have lit.
Turn the "HEAT" ( ), "BLOWER" ( ), and "CONVEYOR"
() switches to the "OFF" ("O") position. Wait for AT
LEAST FIVE MINUTES before restarting the oven. Then,
repeat the Daily Startup procedure.
A. DAILYSTARTUPPROCEDURE
3. Turn the "CONVEYOR"
() switch to the ON
("I") position.
4. If necessary, adjust the
conveyor speed setting
by pressing the or
pushbuttons on the con-
veyor speed controller to
change the displayed
bake time.
6. Turn the "HEAT" ( )
switch to the "ON" ("I")
position, and wait for the
"HEAT ON" light to turn
on.
8. (Optional) Pressthe Tem-
perature ( ) key to show
the Actual Temperature
in the display, and wait
for the "ACTUAL TEMP"
light to turn on. This al-
lows you to monitor the
oven temperature as it
rises to the setpoint.
1. Turnthe "HEAT"( ) and
"BLOWER" ( ) swit-
ches to the "OFF" ("O")
position. Note that the
blowers will remain in op-
eration until the oven has
cooled to below 200°F
(93°C).
II. NORMAL OPERATION - STEP-BY-STEP 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
5 minutes.
3. Open the window to allow the oven to cool faster.
2. Make certain that there
are no products left on
the conveyor inside the
oven. Turn the "CON-
VEYOR" ( ) switch to
the "OFF" ("O") position.
SECTION3-OPERATION
2. Turn the "BLOWER" ( )
switch to the ON ("I")
position.
+wait
for
 Press the Up Arrow
and Down Arrow
Keys as necessary
to adjust the set-
point. or
5. Adjust the temperature
controller to a desired set
temperature, if neces-
sary.
 Press the Set Point
and Unlock keys at
the same time. Wait
for the "SET PT" light
to turn on.
wait
for
B. DAILYSHUTDOWNPROCEDURE
9. Allow the oven to preheat for 10 minutes after it has reached
the set point temperature.
wait
for
+
4. After the oven has cooled and the blowers have turned off,
switch the circuit breaker/fused disconnect to the off posi-
tion.
1. Check that the circuit breaker/fused disconnect is in the on
position. Check that the window is closed.
or

14
ENGLISH
SECTION3-OPERATION
III. QUICK REFERENCE: DIGITAL TEMPERATURE CONTROLLER
Display
Shows the Set Point or
the Actual Tempera-
ture in degrees Fahr-
enheit (F) or Celsius
(C).
"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 Refer-
ence: Troubleshoot-
ing in this section.
Temperature Key
Press this key once to
view the Actual Tem-
perature in the Dis-
play.
Unlock Key
Press this key together
with the Set Point Key
to allow the Set Point
to be changed.
Changes can only be
made for 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.
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 seconds.
Service Key
For use by ser-
vice personnel
only.
"ACTUAL TEMP"
Light
Lights when the
Actual Tempera-
ture is shown in
the display.
"SET PT" (setpoint)
Light
Lights when the set
point is shown in the
display.
"HEAT ON" Light
Lights when the
burner is in operation.

15
ENGLISH
IV. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM PROBLEM SOLUTION
The oven temperature ex-
ceeded 650°F (343°C), and
the burner was automati-
cally shut down.
 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.
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.
SECTION3-OPERATION
light is lit, food product is
undercooked
Oven will not
turn on at all
Oven shuts down shortly
after it is turned on
appears in display,
oven is not heating
Oven will not heat
Oven is operating, but
little or no air is blowing
from air fingers
Electrical power may not be
reaching the oven, or the
controls may be set incor-
rectly.
The gas burner did not light
within 90 seconds of turn-
ing the "HEAT" ( ) Switch
to the ON ("I") position.
This automatically en-
gages a safety lockout
mode.
The oven did not reach
200°F (93°C) within 15 min-
utes of startup, and the oven
has stopped heating.
Controls may be set incor-
rectly.
Air fingers may have been
reassembled incorrectly
after cleaning.
 Check that the circuit breaker/fused disconnect is turned on.
 Check that the "BLOWER" ( ) Switch is in the ON ("I")
position. The burner cannot engage until the blowers are in
operation.
 Turn the "HEAT" ( ), "BLOWER" ( ), and "CONVEYOR"
()switches to the "OFF" ("O") position.
 Wait for AT LEAST FIVE MINUTES before restarting the oven.
 Repeat the Daily Startup procedure.
 Turn the "HEAT" ( ), "BLOWER" ( ), and "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" ( ) and "HEAT" ( ) Switches
are in the ON ("I") position.
 If the oven still will not heat,turn the "HEAT" ( ), "BLOWER"
( ), and "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 above 200°F (93°C).
 Turn the oven off, and allow it to cool. Disconnect electrical
power to the oven.
 Refer to Section 4, Maintenance, for instructions on reassem-
bling the air fingers.
 Turn the oven off, 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, Maintenance, for instructions on checking
the conveyor and drive chain tension.
 Check that the set temperature and bake time settings are
correct.
Conveyor moves with a
jerky motion, or will not
move at all
Food products are
overcooked or
undercooked.
Conveyor may be jammed
on an object in the oven, or
conveyor belt or drive chain
tension may be incorrect.
Controls may be set incor-
rectly.

16
ENGLISH
I. MAINTENANCE - DAILY
A. Check that the oven is cool and the power is disconnected,
as described in the warning at the beginning of this Section.
B. Clean the outside of the oven with a soft cloth and mild
detergent.
C. Clean ALL of the cooling fan grills and vent openings with a
stiff nylon brush. Refer to Figures 4-1 and 4-2 for the
locations of the grills and vents.
D. Check that ALL cooling fans are operating properly.
CAUTION
If a cooling fan is not operating correctly, it must be replaced
IMMEDIATELY. Operating the oven without adequate
cooling can seriously damage the oven's internal compo-
nents.
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. Be sure to replace the
trays in the same positions from which they were removed,
because they are NOT identical. Refer to Figure 2-12 (in
Section 2, Installation).
G. Clean the window in place.
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 the oven for cleaning or servicing, disconnect the gas supply connection before moving the oven.
SECTION4- MAINTENANCE
Figure 4-2 - Rear Cooling Fan Grills
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. DO NOT use excessive
amounts of water, to avoid saturating the oven insulation. DO NOT use a caustic oven cleaner, which can damage the
aluminized 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.
When all cleaning and servicing is complete:
1. If the oven was moved for servicing, return the oven to its
original location. Adjust the legs so that they are seated
properly on the floor.
2. Reconnect the gas supply.
3. Reconnect the electrical supply.
4. Turn on the full-flow gas safety valve. Test the gas line
connections for leaks using approved leak test sub-
stances or thick soap suds.
5. Turn on the electric supply circuit breaker(s).
6. Perform the normal startup procedure.
Figure 4-1 -Motor Shroud and Front Cooling Fan Grills
Cooling fan grills (2)
Grill on top of
conveyor motor
shroud
Grills on rear of
rear shrouds (2)
Grills on inside
face of rear
shrouds (2)
Grills on top
and bottom
of rear
shrouds (4)

17
ENGLISH
II. MAINTENANCE - MONTHLY
NOTE
When removing the conveyor, refer to Figure 2-9 (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 and drive motor shroud 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 conveyor
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 the drive motor, remove the drive motor
sprocket as described in the Conveyor Installation instruc-
tions (in Section 2, Installation).
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 4-3. 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 4-4. AS
EACH FINGER IS DISASSEMBLED, WRITE THE "LOCA-
TION CODE" FOR THE FINGER ON ALL THREE OF ITS
PIECES. This will help you in correctly reassembling the
air fingers.
CAUTION
Incorrect reassembly of the air fingers will change 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 code" 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
2-10 (in Section 2, Installation). The belt should lift between
3-4" (75-100mm). DO NOT OVERTIGHTEN THE CON-
VEYOR BELT. If necessary, the belt tension can be ad-
justed by turning the conveyor adjustment screws, located
at the idler (right) end of the conveyor.
N. Replace the crumb trays and drive motor shroud.
Figure 4-3 - Removing Air Fingers and Plates
Figure 4-4 - Disassembling the Air Fingers
Pull outer plate
straight up
and off
Manifold
Inner plate
Outer Plate
2
Step on lip of manifold
1
Swing ends of inner plate and
manifold apart
3
Pull inner plate
upwards, and
then away from
manifold
4
SECTION4-MAINTENANCE

18
ENGLISH
III. MAINTENANCE - EVERY 3 MONTHS
A. Check that the oven is cool and the power is disconnected,
as described in the warning at the beginning of this Section.
B. Vacuum both of the blower motors, and their surrounding
compartments, using a shop vacuum.
C. Tighten all electrical control terminal screws.
D. Split Belt Disassembly and Cleaning
For split belt ovens ONLY, disassemble, clean and lubri-
cate the conveyor shaft components as described below.
1. Remove the motor shroud, conveyor extensions, and
conveyor as described in Part II, Monthly Maintenance.
2. Remove the master links from each conveyor belt.
Then, roll the belts up along the length of the conveyor
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-
5.
4. Remove the idler shaft assembly from the conveyor.
5. Pull apart the two sections of the idler shaft. Clean the
shafts thoroughly using a rag. Then, lubricate both the
extended shaft and the interior of the hollow shaft using
an FDA-approved light food-grade lubricant.
CAUTION
DO NOT lubricate the shafts using WD40 or a similar
product. This can cause the shafts to wear rapidly.
6. Before reassembling the shafts into the conveyor
frame, check that they are oriented properly. Remem-
ber that unequal-width split belt ovens should AL-
WAYS have the narrower belt at the front of the oven.
7. 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 4-7.
8. Replace the conveyor adjustment screws as shown in
Figure 4-5. To allow the conveyor belt to be reinstalled
later, do not tighten the screws at this time.
9. Loosen the set screw on both of the conveyor drive
sprockets. Then, remove the sprockets from the shaft.
10. Loosen the locking collar set screw, as shown in
Figure 4-6.
11. Push the drive shaft to the right, then lift it free of the
conveyor frame. Then, disassemble and lubricate the
two sections of the drive shaft as described in Step 5.
12. Before reassembling the shafts into the conveyor
frame, check that they are oriented properly. Remem-
ber that unequal-width split belt ovens should AL-
WAYS have the narrower belt at the front of the oven.
13. Reassemble the drive shaft into the conveyor. Check
that the nylon spacer is in place, as shown in Figure 4-
7. Also, check that the bronze washer is in place
between the two sections of the shaft.
14. Replace the drive sprockets. Reassemble the belts
and master links onto the conveyor, and replace the
conveyor in the oven.
15. Reassemble the motor shroud and conveyor exten-
sions onto the oven.
Figure 4-5 - Split Belt Idler Shaft
Figure 4-6 - Split Belt Drive Shaft
Figure 4-7 - Washer and Spacer
Conveyor
adjustment
screw
Locking collar
Bronze washer on
BOTH idler and
drive shafts
Nylon spacer
on drive shaft
ONLY
SECTION4-MAINTENANCE
16 Check the tension of the conveyor belt. The belt should
lift between 3-4" (75-100mm). If necessary, adjust the
belt tension by turning the conveyor adjustment screws.
17. After the belt tension is properly adjusted, tighten the
hex jam nuts (shown in Figure 4-5) against the idler
shaft bracket. This prevents the conveyor from being
over-tightened.

19
ENGLISH
SECTION4-MAINTENANCE
E. Blower Belts
1. To gain access to each blower belt compartment,
remove the four screws shown in Figure 4-8. Then, lift
the rear shroud off its hangers.
If access to the blower motors is required, remove the
two mounting screws shown in Figure 4-8 and lift the
end shrouds straight up and off their hangers. The end
shrouds can only be removed AFTER the rear shrouds
have been removed.
2. Check each blower belt for at least 1" (25mm) deflec-
tion at the center, and for cracking or excessive wear.
See Figure 4-9. Overtightening the belt will cause
premature bearing failure and possible 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 deflection is reached,
then tighten the motor mounting bolts.
F. Lubricating the Blower Fan Bearings
1. Use a grease gun to lubricate the main blower fan shaft
bearings, as shown in Figure 4-10.
When lubricating the bearings:
 Use a high-quality NLGI #2, lithium soap grease
with petroleum oil, such as Middleby P/N 17110-
0015.
 Add the grease slowly until a small bead of grease
is present at the seals. AVOID OVERGREASING.
Excessive greasing may cause harm to the
bearing.
2. Manually turn the blower shaft by pulling on the belt to
purge the grease.
3. Wipe off any excess grease on and around the bear-
ings.
4. Replace the shrouds on the oven.
NOTE
The oven will not operate unless ALL of the motor and
rear shrouds are in place.
IV. MAINTENANCE - EVERY 6 MONTHS
A. Check that the oven is cool and the power is disconnected,
as described in the warning at the beginning of this Section.
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" (6.4mm) in length. Be sure to replace the
brushes in exactly the same position.
C. Clean and inspect the burner nozzle and electrode assem-
bly.
D. Check (and clean, if necessary) the oven venting system.
E. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
Figure 4-10 - Lubricating the Bearings
Figure 4-8 - Rear Shrouds and Guard Plates
At least 1" (25mm)
deflection
Screws
(4 per rear
shroud)
Grease fittings
(1 per bearing, 4
total)
Rear shroud -
removeFIRST.
Access to bearing
and fan belt
End shroud - remove
SECOND (if necessary).
Access to blower motor
Figure 4-9 - Fan Belt Tension
To adjust belt
tension, loosen 4
bolts and
reposition motor
Screws
(2 per end
shroud)
Fan not shown -
see above

ENGLISH FRANÇAIS ESPAÑOL
page 1 page 21 página 41
20
MiddlebyCookingSystemsGroup1400ToastmasterDriveElgin,IL60120USA[phone]FAX[phone]
24-Hour Service Hotline: [phone]
www.middleby.com
V. KEY SPARE PARTS KIT - Available separately. See Figure 4-11.
IMPORTANT
An electrical wiring diagram for the oven is located inside the
machinery compartment or control compartment.
SECTION4-MAINTENANCE
1 1 36939 Kit, Digital Temperature Controller
2 1 27384-0008 Motor, Conveyor Drive
3 2 22450-0052 Brushes, Drive Motor
4 1 37337 Kit, Conveyor Speed Controller
5 1 27170-0263 Assembly, Pickup, Conveyor Drive
6 1 33984 Kit, Thermocouple
7 1 97525 Fan, Cooling
8 1 27381-0069 Motor, Blower, 1 HP
9 1 42810-0114 Kit, Ignition Module
10 1 38811 Assembly, Burner Blower/Motor
11 1 41647 Valve, Modulating Gas, 1/2"
12 1 31651 Amplifier, Modulating Valve
13 1 39530 Air Switch
ItemQty. Part No. Description ItemQty. Part No. Description
Fig. 4-11 - Key Spare Parts Kit
12345
78
6
10
11 12 13
9