Middleby Marshall Model PS536 Owner's Operating And Installation Manual
PS536
Gas & Electric
Domestic & Std. Export
ENGLISH/French/Spanish
P/N 44727
Rev. C V1 2/01
page 1
ENGLISH
page 29
FRANÇAIS
PS536 Gas and Electric Ovens
Models:
PS536
OWNER'S OPERATING AND
INSTALLATION MANUAL
for domestic and standard export ovens
© 2001 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
Combinations:
Single Oven
Double Oven (Two-Stack)
Triple Oven (Three-Stack)
PS536
GAS
PS536
ELECTRIC
208/230V models
PS536
ELECTRIC
380V models
1
página 57
ESPAÑOL
--
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.
ENGLISH
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 TELEPHONE NUMBER 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.
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.
NOTICE: CONTACT YOUR MIDDLEBY MARSHALL AUTHORIZED SERVICE AGENT TO PERFORM MAINTENANCE
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: The equipment warranty is not valid unless the oven is installed, started and demonstrated under the supervision
of a factory certified installer.
Retain This Manual For Future Reference
Middleby Cooking Systems Group 1400 Toastmaster Drive Elgin, IL 60120 USA (847)741-3300 FAX (847)741-4406
24-Hour Service Hotline: 1-(800)-238-8444
www.middleby.com
2
TABLE OF CONTENTS
page page
SECTION 1 - DESCRIPTION ................................................... 4
V. FINAL ASSEMBLY ................................................... 12
I. OVEN USES............................................................. 4
II. OVEN COMPONENTS ............................................. 4
A. Window ............................................................. 4
B. Conveyor Exit Tray ............................................ 4
C. Eyebrows .......................................................... 4
D. End Plugs ......................................................... 4
E. Control Panel.................................................... 4
F. Machinery Compartment Access Panel .......... 4
G. Serial Plate ....................................................... 4
H. Conveyor Drive Motor ....................................... 4
I. Crumb Pans ..................................................... 4
J. Conveyor ........................................................... 4
K. Gas Burner or Heating Elements .................... 4
L. Blowers ............................................................. 4
M. Air Fingers ........................................................ 4
III. OVEN SPECIFICATIONS ......................................... 4
A. Dimensions...................................................... 4
VI. ELECTRICAL SUPPLY ...........................................13
A. Additional Information - Gas Ovens ................ 13
B. Additional Information - Electric Ovens .......... 13
C. Connection ...................................................... 13
VII. GAS SUPPLY .......................................................... 13
A. Gas Utility Rough-In Recommendations ....... 14
B. Connection ...................................................... 14
C. Gas Conversion .............................................. 14
SECTION 3 - OPERATION ..................................................... 15
I. LOCATION AND DESCRIPTION OF CONTROLS . 15
A. BLOWER ( ) Switch ......................................15
B. CONVEYOR ( ) Switch ............................... 15
C. Conveyor Speed Controller .............................15
D. Digital Temperature Controller ....................... 15
E. Machinery Cpt. Access Panel Safety Switch .. 15
II. NORMAL OPERATION, STEP-BY-STEP ................16
ENGLISH
B. General Specifications ..................................... 4
C. Electrical Specifications - Electric Ovens ........ 5
D. Electrical Specifications - Gas Ovens ............. 5
E. Gas Orifice and Pressure Specifications ........ 5
SECTION 2 - INSTALLATION.................................................. 6
I. INSTALLATION KIT .................................................. 7
II. BASE PAD KIT .......................................................... 7
III. VENTILATION SYSTEM ........................................... 8
A. Requirements .................................................. 8
B. Recommendations .......................................... 8
C. Other Ventilation Concerns .............................. 8
IV. ASSEMBLY ............................................................... 9
A. Top Panel and Base Pad Assembly ............... 9
B. Stacking ........................................................... 10
C. Restraint Cable Installation ............................10
D. Conveyor Installation....................................... 11
A. Daily Startup Procedure .................................. 16
B. Daily Shutdown Procedure ............................. 17
III. QUICK REFERENCE: DIGITAL TEMPERATURE
CONTROLLERS .....................................................18
IV. QUICK REFERENCE: TROUBLESHOOTING .......20
SECTION 4 - MAINTENANCE ................................................. 21
I. MAINTENANCE - DAILY ..........................................21
II. MAINTENANCE - MONTHLY .................................. 22
III. MAINTENANCE - EVERY 3 MONTHS .................... 22
IV. MAINTENANCE - EVERY 6 MONTHS .................... 24
V. KEY SPARE PARTS KIT ......................................... 24
SECTION 5 - ELECTRICAL WIRING DIAGRAMS ................... 25
I. WIRING DIAGRAM, PS536 GAS OVEN, ................. 25
208/230V, 60 Hz, 1 Ph
II. WIRING DIAGRAM, PS536 ELECTRIC, ................. 26
208/230V, 60 Hz, 3 Ph
III. WIRING DIAGRAM, PS536 ELECTRIC OVEN, ...... 27
380V, 50 Hz, 3 Ph
3
SECTION 1 - DESCRIPTION
I. OVEN USES
PS536 Ovens can be used to bake and/or cook a wide
variety of food products, such as pizza, pizza-type products,
ENGLISH
cookies, sandwiches and others.
II. OVEN COMPONENTS - see Figure 1-1.
A. Window (on ovens so equipped): Allows the user to see
and access food products inside the baking chamber.
B. Conveyor Exit Tray: Prevents food products from falling off
the end of the moving conveyor.
C. Eyebrows (on ovens so equipped): Can be adjusted to
various heights to prevent heat loss into the environment.
D. End Plugs: Allow access to the oven's interior.
E. Control Panel: Location of the operating controls for the
oven. Refer to Section 3,
F. Machinery Compartment Access Panel: Allows access
to the oven's interior components. No user-servicable
parts are located inside the machinery compartment.
G. Serial Plate: Provides specifications for the oven that affect
installation and operation. Refer to Section 2, Installation,
for details.
H. Conveyor Drive Motor: Moves the conveyor.
I. Crumb Pans: Catch crumbs and other material that drop
through the conveyor belt. One crumb pan is located
underneath each end of the conveyor.
J. Conveyor: Moves the food product through the oven.
Operation, for details.
Not Shown:
K. Gas Burner (gas ovens) or Heating Elements (electric
ovens): Heat(s) air, which is then projected to the air
fingers by the blowers.
L. Blowers: Fans that project hot air from the gas burner or
heating elements to the air fingers.
M. Air Fingers: Project streams of hot air onto the food
product.
Fig. 1-1 - Oven Components
B
A
EDC
G
H
I
J
F
III. OVEN SPECIFICATIONS
Table 1-1: Dimensions
Overall Height: single oven with 17-1/2" (446mm) legs 43-1/2" (1105mm)
double oven with 17-1/2" (446mm) legs 63" (1600mm)
triple oven with 6" (152mm) legs 71" (1803mm)
Overall Depth: without front window 39-3/4" (1010mm)
with front window 43" (1092mm)
Overall Length: without exit tray installed 60" (1524mm)
with exit tray installed 68-1/4" (1734mm)
Baking Chamber Length 36" (914mm)
Conveyor Width: Single Belt 20" (508mm)
Split Belt 2 x 9-1/2" (241mm)
Conveyor Length 60" (1524mm)
Recommended Minimum Clearances:
Rear of oven to wall 3" (76mm)
Control end of conveyor to wall 18" (457mm)
Non-control end of oven to wall 3" (76mm)
Table 1-2: General specifications (per oven cavity)
Weight 400 lbs. (182kg)
Rated Heat Input: Natural gas ovens 50,000 BTU (12,600 kcal, 14.65 kW/hr.)
Propane ovens 45,000 BTU (11,340 kcal, 13.19 kW/hr.)
Electric ovens 16kW
Operating Temperature 200-600°F (93-316°C)
Warmup Time 25 minutes
4
SECTION 1 - DESCRIPTION
Table 1-3: Electrical specifications for electric ovens (per oven cavity)
Main Blower Control Current Draw k W
Voltage Circuit Voltage Phase Freq. L1 L2 L3 N Rating Poles Wires
208V 120V conv. speed control, 3 Ph 60 Hz 50A 50A 50A -- 16.0 kW 4 Pole 4 Wire
drive motor, contactor, at 208V (3 hot, 1 gnd)
& temp. control; all others 208V
230V 120V conv. speed control, 3 Ph 60 Hz 45A 45A 45A -- 16.0 kW 4 Pole 4 Wire
drive motor, contactor, at 230V (3 hot, 1 gnd)
& temp. control; all others 230V
380V * 120V conv. speed control, 3 Ph 50 Hz 25A 25A 28A 5A 16.0 kW 4 Pole 5 Wire (3 hot,
drive motor, contactor, at 380V 1 neutral, 1 gnd)
& temp. control; 380V heating
elements; all others 240V
* 380V model is not approved by or .
Table 1-4: Electrical specifications for gas ovens (per oven cavity)
Main Blower Control Current
Voltage Circuit Voltage Phase Freq. Draw Poles Wires
208/240V 120V conv. speed control, 1 Ph 60 Hz 6A 3 Pole 4 Wire (2 hot, 1 neut, 1 gnd)
drive motor, contactor,
& temp. control; all others
as per line (208/240V)
ENGLISH
Table 1-5: Gas orifice and pressure specifications (per oven cavity)
Gas Type Main Orifice I.D. Pilot Orifice I.D. Supply (Inlet) Pressure Pressure
Natural 0.0935 (2.3749mm, #42 drill) 0.018 (0.46mm) 4-7 W.C. (9.95-17.4mbar) * 3.5 W.C. (8.7mbar)
Propane 0.0520 (1.3208mm, #55 drill) 0.018 (0.46mm) 11-14 W.C. (27.4-34.9mbar) * 10.5 W.C. (24.9mbar)
* The gas supply pressures shown are for ovens installed in North America. The required gas supply pressures of other locations are
dependent on the local gas type and on all applicable local codes.
Orifice (Manifold)
IMPORTANT
Additional electrical information is provided on the oven's serial plate, and on the wiring diagram inside the machinery
compartment.
5
WARNING - For gas ovens, after any conversions, readjustments, or service work on the oven:
ENGLISH
For electric ovens, after any conversions, readjustments, or service work on the oven, check that the
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
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
SECTION 2 - INSTALLATION
Perform a gas leak test.
Test for correct air supply.
Test for proper combustion and gas supply.
Check that the ventilation system is in operation.
WARNING
ventilation system (if so equipped) is in operation.
WARNING
Keep the appliance area free and clear of combustibles.
WARNING
this Manual.
WARNING
installed shall not affect the air supply to the oven.
CAUTION
For additional installation information, contact your local Authorized Service Agent.
NOTE
There must be adequate clearance between the oven and combustible construction. Clearance
must also be provided for servicing and for proper operation.
NOTE
An electrical wiring diagram for the oven is located inside the machinery compartment.
NOTE
All aspects of the oven installation, including placement, utility connections, and ventilation requirements,
must conform with any applicable local, national, or international codes. These codes supercede the require-
ments and guidelines provided in this manual.
NOTE
In the USA, the oven installation must conform with 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 electri-
cally grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electrical
Code CSA C22.2.
In Australia, the oven installation must conform with any requirements of the appropriate statutory authority.
Gas oven installtions must conform with AGA Code, AG601.
NOTE
6
Figure 2-1 - Installation Kit
SECTION 2 - INSTALLATION
3
7
1
2
8a 8b
ENGLISH
6
14
13
12
11
10
9
15
5
4
1
16
17
18
I. INSTALLATION KIT - see Figure 2-1
Item Single Oven Double Oven Triple Oven Part No. Description
1 1 2 3 42882 Top panel
2 2 2 2 220352 Screw, pan head #10 x 1" (top panel - front)
3 2 2 2 3A80A8801 Screw, pan head #10 x 2" (top panel - rear)
4 -- 1 2 44837 Stacking panel
5 -- 1 2 44918 Insulation, stacking panel, pre-cut
6 -- 4 8 4111A8815 Screw, hex head #10-32 x 1/2" (stacking panels)
7 1 1 1 42893 Base pad
8a 4 4 -- 42890 17-1/2" (445mm) leg extension, for single and double ovens
8b -- -- 4 44799 6" (152mm) leg extension, for triple ovens
9 2 2 2 22290-0009 Caster, with flat plate and brake
10 2 2 2 22290-0010 Caster, with flat plate (no brake)
11 1 1 1 21392-0004 Eyebolt, 3/4"
12 31 31 31 220373 Hex bolt, 3/8"-16 x 1"
13 32 32 32 21416-0001 Flat washer, 3/8"
14 32 32 32 21422-0001 Lockwasher, 3/8"
15 1 1 1 22450-0228 Restraint cable assembly
16 1 2 3 22361-0001 Gas hose
16 1 1 1 44727 Owner's Operating Manual, PS536 Gas and Electric Ovens
17 1 1 1 1002040 Middleby Marshall Authorized Service Agency Listing
Qty. Qty. Qty.
7
SECTION 2 - INSTALLATION
II. VENTILATION SYSTEM
IMPORTANT
ENGLISH
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
A. Requirements
CAUTION
Gas oven installations
ventilation system with electrical exhaust air sensing control.
A mechanically driven ventilation system is STRONGLY
RECOMMENDED for electric oven installations.
PROPER VENTILATION OF THE OVEN IS THE
RESPONSIBILITY OF THE OWNER.
REQUIRE a mechanically driven
B. Recommendations
NOTE THAT THE HOOD DIMENSIONS SHOWN IN FIGURE 22 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.
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 heatrelated 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 temperaturecontrolled 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.
12" (305mm)
minimum
2" (51mm)
minimum
Fig. 2-2 - Ventilation System
12" (305mm)
minimum
8" (203mm)
minimum
8
1" (25mm)
minimum
III. ASSEMBLY
A. Top Panel and Base Pad Assembly
1. Install the four leg extensions onto the base pad using the
3/8"-16x1" screws, 3/8" flat washers, and 3/8" lockwashers
supplied in the Base Pad Kit. See Figure 2-3. Check that
the finished sides of each leg extension face OUTWARDS.
One rear leg should be attached using three 3/8"-16 x 1"
screws and the 3/4" eyebolt, as shown in Figure 2-3. This
eyebolt acts as the anchor point for the restraint cable
assembly (see Part C,
2. Install one caster onto each leg extension, as shown in
Figure 2-4. Use the 3/8"-16x1" screws, 3/8" flat washers,
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.
3. Install the top panel in place on the top oven cavity using the
screws included in the base pad kit, as shown in Figure 2-
4.
4. Install the lower oven cavity onto the base pad. Check that
the eyebolt welded onto the pad faces the rear of the oven.
Restraint Cable Installation).
SECTION 2 - INSTALLATION
Figure 2-3 - Leg extension and casters installation
Finished sides of
leg extension
face corner of
base pad
3/8" flat
washer
3/8" lock
washer
3/8"-16 x 1"
hex screw
3/4" eyebolt
(inside corner of
one rear leg
extension
only)
3/8" flat
washer
3/8" lock
washer
Locking casters -
FRONT of oven
Non-locking casters -
REAR of oven
3/8"-16 x 1"
hex screw
ENGLISH
#10 x 2" screws
attach rear of
top panel
#10 x 1" screws
attach front of
top panel
Figure 2-4 - Top panel and base pad installation
Bottom oven
cavity
Assembled
base pad
Top oven
cavity
9
SECTION 2 - INSTALLATION
B. Stacking
Figure 2-5 - Assembling the stacking spacers
For single ovens, skip ahead to Part C, Restraint Cable
Installation. For double or triple ovens, continue on to Step
1, below.
1. Assemble the stacking spacer(s) as shown in Figure 2-5.
ENGLISH
One spacer assembly is supplied for a double oven, while
two are supplied for a triple oven.
2. Place one of the assembled spacers on top of the lower
oven cavity, making sure that the insulation faces up.
3. Place the center oven cavity (for triple ovens) or the top oven
cavity (for double ovens) on top of the spacer. Check that
all four sides of the spacer overlap the base of the oven, and
that the oven is level and firmly seated. See Figure 2-6.
4. For triple ovens, repeat Steps 2 and 3 to install the top oven
cavity.
Figure 2-6 - Stacking
#10-32 x 1/2"
hex screws
1-1/2" (38mm)-thick
insulation, pre-cut
Stacking panel,
P/N 44837
Top panel,
P/N 42882
Assembled
spacer
(insulation
faces up)
C. 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 one of the rear leg extensions,
while the other is anchored to the wall. See Figure 2-7.
After connecting the restraint cable, move the oven to its final
location. Then, lock the two front casters.
Figure 2-7 - Installing the Restraint Cable
Restraint cable
3/8"-16 x 1"
eyebolt on
rear leg
extension
assembly
3/4 (19mm)
eyebolt
Wall of
structure
10
D. Conveyor Installation
1. Unfold the conveyor frame so that it lies flat on the floor. As
you unfold the frame, check that the locator pins shown in
Figure 2-8 lock into the slots on the bracket.
2. Refer to Figure 2-8. Note the locations of the four tensioning
screws (2 per side) in the slotted holes on the brackets.
Loosen these screws to allow the conveyor to be properly
tensioned.
3. Lift the conveyor belt away from the frame, as shown in
Figure 2-8, to check the belt tension. The belt should lift
between 1-2" (25-50mm).
SECTION 2 - INSTALLATION
Figure 2-8 - Assembling and tensioning the conveyor
Folded
frame
ENGLISH
If it is necessary to adjust the belt tension, gently push the
two conveyor frame sections closer together, or further
apart, as required. Then, re-check the tension of the
conveyor belt. Repeat this step as necessary until the
proper belt tension is achieved.
4. When the belt tension is correctly adjusted, tighten the two
tensioning screws on each side of the conveyor frame.
This fastens the two frame sections together at the correct
belt tension.
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:
a. Remove the master links using long-nose pliers.
Then, roll up the belt along the length of the conveyor
frame.
b. Add or remove belt links as necessary to achieve the
correct belt tension.
c. Replace the belt on the conveyor frame. Check the
following:
The conveyor belt links must be oriented as shown
in Figure 2-9.
The smooth side of the conveyor belt must face
UP.
d. Connect the inside master links. Check that the links
are oriented as shown in Figure 2-9.
e. 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 2-9.
Pins on frame
fit into slots
on bracket
Tensioning
screws in slotted
holes (2 per side)
With tensioning
screws loosened,
frame sections can
be moved to adjust
belt tension
1-2" (25-50mm)
vertical deflection
11
Figure 2-9 - Conveyor and Master Link Orientation
Direction
of travel
Incorrect
master link
position
CORRECT
master link
position
SECTION 2 - INSTALLATION
6. Lift the conveyor and position it in the oven. The conveyor
can only be installed from the end of the oven with the drive
motor.
7. Continue moving the conveyor into the oven until the conveyor frame is positioned properly. The inside supports for
ENGLISH
the crumb trays should rest firmly against the lower end
plugs, as shown in Figure 2-10.
8. When the conveyor is positioned properly, 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
move freely.
9. 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.
V. FINAL ASSEMBLY
must
Crumb tray
support
bracket
Figure 2-10 - Conveyor placement
End plug
Figure 2-11 - Final assembly
Wing screws
2 per end plug
Chain cover:
Place down over
conveyor sprocket
1. Install the conveyor drive motor cover as shown in Figure
2-11.
2. Install the crumb trays as shown in Figure 2-11. First, place
the inside edge of each tray onto its support bracket. Then,
hook the outside edge of the tray over the end of the
conveyor frame.
Note that crumb trays for the lower (or a single) oven are
solid, while those for all upper ovens have perforated
openings, as shown in Figure 2-12.
3. Press the conveyor exit tray down over the edge of the
conveyor frame at the exit end of the oven. See Figure 2-11.
Conveyor
exit tray:
Press down
over end of
conveyor
Crumb trays (2):
1. Place inside
edge on support
bracket
2. Hook outside
edge over
conveyor frame
Figure 2-12 - Crumb trays
Crumb trays
WITH openings -
all upper ovens
Crumb trays
WITHOUT openings -
lower oven only
12
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 (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 Tables 1-3 and 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!
A. Additional Information - Gas Ovens
All electric supply connections are made at the
terminal block located in the electrical junction
box, shown in Figure 2-13. The power lines then
connect to the oven circuits through a safety
switch located inside the machinery compartment. This switch interrupts electric power to the
oven when the Machinery Compartment Access
Panel is opened.
1.3" (33mm) cutout for
electric utility connection
(electric ovens only)
SECTION 2 - INSTALLATION
B. Additional Information - Electric Ovens
A 1.3" (33mm) dia. cutout in the back wall of the machinery
compartment provides access to the electrical supply
connections. The actual wiring connections are made at
the terminal block located in the electrical junction box.
Using flexible cables for the electric power supply
conductors requires a 1.3" (33mm) strain-relief fitting (not
furnished with the oven) to enable safe access to the
terminal block.
C. 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.
Figure 2-13 - Utility connection locations
Electrical
Junction Box
1/2" NPT pipe for gas
utility connection
(gas ovens only)
ENGLISH
VII. GAS SUPPLY
CAUTION
DURING PRESSURE TESTING NOTE ONE OF THE FOLLOWING:
1. The oven and its individual shutoff valve must be disconnected from the gas 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 system at
test pressure equal to or less than 1/2 psi (3.45 kPa).
3. If incoming pressure is over 14 W.C. (35mbar), a separate regulator MUST be installed in the line BEFORE the
individual shutoff valve for the oven.
WARNING: To prevent damage to the control valve regulator 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.
13
SECTION 2 - INSTALLATION
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.
Gas Meter - 650 cfh meter
ENGLISH
Gas Line
DEDICATED LINE from the gas meter to the oven
2" (50.8mm) pipe for natural gas
1-1/2" (38.1mm) pipe for propane
Maximum length: 200' (61m). Each 90° elbow equals 7'
(2.13m) of pipe.
B. Connection
Check the ovens gas supply requirements before making the
gas utility connection. Gas supply requirements are listed on
the ovens serial plate and in Table 1-5, 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.
Inlet and regulated gas pressure readings can be taken using
a U tube manometer at the tap locations shown in Figure 2-
15.
NOTE
In the USA, the installation must conform with local codes, or in
the absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1.
In Canada, the installation must conform with local codes, or in
the absence of local codes, with the Natural Gas Installation
Code, CAN/CGA-B 149.1, or the Propane Installation Code,
CAN/CGA-B 149.2, as applicable.
In Australia, the installation must conform with AGA Code
AG601 and with any requirements of the appropriate statutory
authority.
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 Connec-
tors for Movable Gas Appliances, ANSI Z21.69 (in USA), or
Connectors for Movable Gas Appliances, CAN/CGA-6.16
(in Canada), AND
A quick-disconnect device that complies with the Standard
for Quick-Disconnect Devices for Use With Gas Fuel, ANSI
Z21.41 (in USA.), or, if applicable, Quick-Disconnect Devices for Use With Gas Fuel, CAN1-6.9 (in Canada).
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 Marshall 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 performed by a Middleby Marshall
Authorized Service Agent.
Pilot
assembly
Manifold
pressure tap
(where manifold
gas pressure is
measured)
Inlet pressure
tap (where
incoming gas
pressure is
measured)
14
Figure 2-14 - Flexible Gas Hose Installation
90°
Elbow
To Gas
Supply Pipe
Union OR
quick-
disconnect
device
Flexible
Gas Hose
Figure 2-15 - Gas Burner and Piping Assembly
In-shot
burners (2)
Modulating
gas valve
Combination Gas
Control Valve
(Safety Regulator)
On/Off Switch
Always leave in ON position
Full-Flow
Gas
Shutoff
Valve
SECTION 3 - OPERATION
I. LOCATION AND DESCRIPTION OF CONTROLS
Fig. 3-1 - Control Panel
D
ENGLISH
D
A
B
C
A.
B.
"BLOWER" Switch: Turns the blowers and
cooling fans on and off. When set to the "ON" (I)
position, it also allows the burner (gas ovens)
or heating elements (electric ovens) to activate.
Activation is determined by the settings on the
Digital Temperature Controller.
"CONVEYOR" Switch: Turns the conveyor drive
motor on and off.
D.
Digital Temperature Controller: Continuously
monitors the oven temperature. Settings on the
Digital Temperture Controller control the activation of the burner or heating elements. Keypad
controls allow the operator to select the cooking
temperature and monitor oven operation.
Note that two different models of Digital Temperature Controller are used on PS536 ovens.
This section provides instructions specific to
each controller.
C.
Conveyor Speed Controller: Adjusts and displays the bake time. Single-belt ovens have one
controller. Split belt ovens have one controller
for each conveyor belt, labeled "FRONT" and
"BACK."
NOT SHOWN:
E. Machinery Compartment Access Panel Safety Switch:
Disconnects 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.
15
SECTION 3 - OPERATION
II. NORMAL OPERATION - STEP-BY-STEP
A. DAILY STARTUP PROCEDURE
1. Check that the circuit breaker/fused disconnect is in the on
ENGLISH
position. Check that the window (if so equipped) is closed.
2. Turn the "BLOWER" ( )
switch to the ON ("I")
position.
3. Turn the "CONVEYOR"
) switch to the ON
(
("I") position.
4. If necessary, adjust the
conveyor speed setting
by pressing the
pushbuttons on the conveyor speed controller to
change the displayed
bake time.
or
or
If the oven uses this
Digital Temperature
Controller:
5a. Press the
pushbuttons on the digital temperature controller to adjust the set temperature, if necessary.
Note that the set temperature is shown in the lower
window of the display,
while the actual oven
temperature is shown in
the upper window.
6a. Check that the "1" light
illuminates. This shows
that the burner or heating
elements have been
turned on.
The "2" light will illuminate while the oven heats
to its minimum normal
operating temperature of
200°F/93°C.
or
Actual
temp
Set
temp
or
Heating
elements on
Oven
temperature
under 200°F/
93°C
7a. Wait for the oven to heat to the set point temperature. Higher
set point temperatures will require a longer wait. The oven
can reach a temperature of 500°F (232°C) in approximately
15 minutes.
8a. Allow the oven to preheat for 10 minutes after it has reached
the set point temperature.
16
B. DAILY SHUTDOWN PROCEDURE
SECTION 3 - OPERATION
If the oven uses this
Digital Temperature
Controller:
5b. Adjust the temperature
controller to a desired set
temperature, if necessary.
Press the Set Point
and Unlock keys at
the same time. Wait
for the "SET PT" light
to turn on.
Press the Up Arrow
and Down Arrow
Keys as necessary
to adjust the setpoint.
6b. Check that the "HEAT ON"
light illuminates. This
shows that the burner or
heating elements have
been turned on.
7b. 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.
+
wait
for
or
wait
for
1. Turn the "BLOWER" ( )
and "CONVEYOR" (
switches to the "OFF"
("O") position. Open the
window (if so equipped)
to allow the oven to cool
faster.
Note that the blowers will
remain in operation until
the oven has cooled to
below 200°F (93°C).
3. After the oven has cooled and the blowers are off, switch the
circuit breaker/fused disconnect to the off position.
)
+
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 "BLOWER"
to the "OFF" ("O") position.
UTES before restarting the oven. Then, repeat the Daily
Startup procedure.
( ) and "CONVEYOR" ( ) switches
Wait for AT LEAST FIVE MIN-
CAUTION
In case of power failure, turn all switches to the OFF ("O")
position, open the oven window (if so equipped), 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,
AT LEAST FIVE MINUTES BEFORE RESTARTING THE
OVEN.
No attempt should be made to operate the oven during a
power failure. In gas ovens, the burner will not operate
and gas will not flow through the burner without electric
power.
WAIT FOR
ENGLISH
8b. (Optional) Press the Tem-
perature (
the Actual Temperature
in the display, and wait
for the "ACTUAL TEMP"
light to turn on. This allows you to monitor the
oven temperature as it
rises to the setpoint.
9b. Allow the oven to preheat for 10 minutes after it has reached
the set point temperature.
) key to show
wait
for
17
SECTION 3 - OPERATION
III. QUICK REFERENCE: DIGITAL TEMPERATURE CONTROLLERS
ENGLISH
Upper display
Shows the actual
oven temperature.
light
Illuminates when the burner
or heating elements are on.
This light will flicker during
normal operation after the
oven reaches the set point
temperature.
light
Illuminates when
oven temperature is
EITHER below
200°F/93°C
OR above 600°F/
316°C.
Lower display
Shows the set
point temperature.
Advance key
Service use only.
Up Arrow key
Increases the set
point temperature.
Press the key once
to change the set
point by one degree.
Hold the key down
for larger changes.
Percent
indicator
light
Service use only.
Infinity key
Service use only.
Down Arrow key
Decreases the set point
temperature. Press the
key once to change the
set point by one degree.
Hold the key down for
larger changes.
18
SECTION 3 - OPERATION
"SP LOCK"
Light
Lights when the
set point is locked
out from changes.
This setting can
only be changed by
service personnel.
OVERTEMP
Light
Lights when the oven
temperature is
greater than 650°F
(343°C). Refer to
Quick Reference:
Troubleshooting in
this section.
Display
Shows the Set Point
or the Actual Tem-
perature in degrees
Fahrenheit (F) or
Celsius (C).
"HEAT ON"
Light
Lights when the
burner or heating
elements, as
appropriate for the
oven model, are in
operation.
ENGLISH
"SET PT"
(setpoint)
Light
Lights when the
set point is shown
in the display.
"ACTUAL
TEMP" Light
Lights when the
Actual Tempera-
ture is shown in
the display.
Temperature
Key
Press this key once
to view the Actual
Temperature in the
Display.
together with the Set
Point Key to allow the
changed. Changes
can only be made for
Unlock Key
Press this key
Set Point to be
60 seconds.
Up Arrow and Down
Arrow Keys
Press these keys to
adjust the Set Point up or
down. If the Set Point will
not change, refer to Set
Point Key and Unlock Key
in this section.
19
Service Key
Service use
only.
Set Point Key
Press this key
together with the
Unlock Key to allow
the Set Point to be
changed.
Changes can only be
made for 60 sec-
onds.
SECTION 3 - OPERATION
IV. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM PROBLEM SOLUTION
ENGLISH
light illu-
minates
after
oven has been
operating normally
Oven shuts down
completely during operation
light is lit, oven will
not heat
Oven shuts down
shortly after it is
turned on
(gas ovens only)
appears in display, oven is not
heating
The oven temperature is in
excess of 600°F (316°C). If
the oven is left in operation,
the temperature may rise to
650°F (343°C) and cause a
shutdown.
The oven temperature exceeded 650°F (343°C), and
the oven was automatically
shut down.
The gas burner did not light
within 90 seconds of turning the "BLOWER"
( )
Switch to the ON ("I") position. This engages a safety
lockout mode.
The oven did not reach
200°F (93°C) within 15 minutes of startup, and has
stopped heating.
Turn the oven off according to the Daily Shutdown Procedure.
Allow the oven to cool. Regardless of the time that is required
for the oven to cool, wait for AT LEAST FIVE MINUTES before
restarting the oven.
Repeat the
Daily Startup Procedure.
Turn the oven off according to the Daily Shutdown Procedure.
Contact your Middleby Marshall Authorized Service Agent to
determine and correct the cause of the condition to prevent
damage to the oven.
Turn the "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 "BLOWER"
( ) and "CONVEYOR" ( )switches to
the "OFF" ("O") position.
Wait for AT LEAST FIVE MINUTES before restarting the oven.
Repeat the Daily Startup procedure.
Oven will not
turn on at all
Oven will not heat
Oven is operating, but
little or no air is blowing
from air fingers
Conveyor moves with a
jerky motion, or will not
move at all
Electrical power may not be
reaching the oven, or the
controls may be set incorrectly.
Controls may be set incorrectly.
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.
Check that the Set Point is correctly set.
Check that the "BLOWER"
( ) Switch is in the ON ("I")
position.
If the oven still will not heat, turn the oven off according to the
instructions in the Daily Shutdown Procedure.
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).
Air fingers may have been
reassembled incorrectly
after cleaning.
Turn the oven off according to the
Refer to Section 4, Maintenance, for instructions on reassem-
bling the air fingers.
Daily Shutdown Procedure.
Blower belt may be broken. Turn the oven off according to the Daily Shutdown Procedure.
Contact your Middleby Marshall Authorized Service Agent to
correct the problem.
Conveyor may be jammed
on an object in the oven, or
conveyor belt or drive chain
may be overtightened.
Turn the oven off according to the
Check if the conveyor is blocked by an object inside the oven.
Check that the conveyor drive chain is not overtightened.
Daily Shutdown Procedure.
Refer to Section 4, Maintenance, for instructions on checking
the conveyor belt tension.
Food products are
overcooked or
Controls may be set incorrectly.
undercooked
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.
Check that the set temperature and bake time settings are
correct.
20
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. For gas ovens, reconnect the gas supply.
3. Reconnect the electrical supply.
4. If the restraint cable was disconnected to clean or service
the oven, reconnect it at this time.
5. For gas ovens, 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.
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 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.
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 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.
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 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. 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 (if so equipped) in place.
Vents on
front panel
of oven
Vents on rear of
machinery
compartment
access panel
21
Figure 4-1 -Cooling Vents and Grills
Grills/vents
on rear of
oven
SECTION 4 - MAINTENANCE
II. MAINTENANCE - MONTHLY
A. Check that the oven is cool and the power is disconnected,
as described in the warning at the beginning of this Section.
B. Refer to Part D, Conveyor Installation, in the Installation
ENGLISH
section of this Manual. Then, remove the following components from the oven:
Conveyor exit tray
Crumb trays
Chain cover
End plugs
Conveyor assembly
C. 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
(Bottom Row) B1 B2 B3 B4
D. Disassemble the air fingers. See Figure 4-3. AS EACH
FINGER IS DISASSEMBLED, WRITE THE "LOCATION
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.
E. 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.
F. Reassemble the air fingers. Then, replace them in the
oven, using the "location code" as a guide.
G. Install the end plugs on the oven. Then, reinstall the
conveyor.
I. Reattach the drive chain. Replace the chain cover.
J. Check the tension of the conveyor belt as shown in Figure
2-9 (in Section 2,
1-2" (25-50mm). If necessary, adjust the belt tension using
the procedure in Part D (Conveyor Installation) in the
Installation section of this Manual.
K. Replace the crumb trays and exit tray onto the oven.
Installation). The belt should lift between
Figure 4-2 - Removing Air Fingers and Plates
Figure 4-3 - Disassembling the Air Fingers
Outer Plate
Inner plate
Manifold
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. Open the machinery compartment access panel. Vacuum
the inside of the compartment 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. Refer to Part D, Conveyor Installation, in the Installation section of this Manual. Then, remove the following
components from the oven:
Conveyor exit tray
Crumb trays
Chain cover
End plugs
Conveyor assembly
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.
22
3. Disassemble and clean the drive and idler shafts
using the following procedure.
a. Loosen (DO NOT REMOVE) the set screw on the
outer drive sprocket. Then, slide the drive sprocket
off the end of the drive shaft. See Figure 4-4.
b. Loosen (DO NOT REMOVE) the set screws on all
four steel spacers (2 per shaft), AND on all twelve
conveyor belt sprockets (6 per shaft).
c. Gently work the shaft sections out of the conveyor
frame, removing the conveyor belt sprockets as
necessary. See Figures 4-4 and 4-5.
d. Slide the two sections of each shaft apart.
e. Clean all of the shaft components thoroughly
using a rag. Then, lubricate each solid inner shaft,
AND the interiors of each hollow shaft, using an
FDA-approved light food-grade lubricant. DO NOT
lubricate the shafts using WD40 or a similar
product. This can cause the shafts to wear rapidly.
f. Slide the hollow shaft sections over the solid inner
shafts. Check that the hollow section that has a
drive sprocket attached is placed at the end of the
the drive shaft.
g. Slide the reassembled shafts into the conveyor
frame. As the shafts are replaced, slide the steel
spacers and conveyor belt sprockets onto the
shafts. Refer to Figures 4-4 and 4-5.
h. After the shafts are properly aligned, position the
steel spacers against the ends of the bushings
on the conveyor frame. Tighten the set screws on
the spacers to hold them in place. Leave the
conveyor belt sprockets loose at this time.
i. Replace the outer drive sprocket. Tighten its set
screw to hold it in place.
j. Refer to Part D,
Conveyor Installation, in the Installation section of this Manual to replace the conveyor belt. As you replace the belt, position the
conveyor belt sprockets.
k. After the belt is in place and the sprockets are
correctly positioned, tighten the set screws to hold
the sprockets in place.
4. Reinstall the end plugs and conveyor onto the oven.
5. Reattach the drive chains. Replace the chain cover.
7. Check the tension of the conveyor belt as shown in
Figure 2-9 (in Section 2, Installation). The belt should
lift between 1-2" (25-50mm). If necessary, adjust the
belt tension using the procedure in Part D (Conveyor
Installation) in the Installation section of this Manual.
8. Replace the crumb trays and exit tray onto the oven.
Spacer (2)
Smooth
sprocket (2)
Spacer (2)
Smooth
sprockets (6)
SECTION 4 - MAINTENANCE
Figure 4-5 - Disassembling the drive shaft
2. Loosen set
screws on belt
sprockets and
spacers (8)
Sprockets
w/teeth (4)
1. Remove outer
drive sprocket
Bushing
4. Disassemble,
clean, and
lubricate shafts
3. Slide shafts out
of frame
Figure 4-5 - Disassembling the idler shaft
1. Loosen set
screws on belt
sprockets and
spacers (8)
ENGLISH
23
Bushing
3. Disassemble,
clean, and
lubricate shafts
2. Slide shafts out
of frame
SECTION 4 - MAINTENANCE
E. Blower Belt
1. Remove the six screws shown in Figure 4-6. Then,
remove the rear panel from the oven.
2. Check the blower belt for the proper 1/4" (6.4mm)
deflection at the center, and for cracking or excessive
ENGLISH
wear. See Figure 4-6. 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" (6.4mm) deflection
is reached, then tighten the bolts.
F. Lubricating the Blower Fan Bearings
1. Use a grease gun to lubricate the main blower fan
shaft bearings, as shown in Figure 4-6.
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.
Excessive greasing may cause harm to the bearing.
2. Manually turn the blower shaft by pulling on the belt to
purge the grease. Wipe off any excess grease.
3. Replace the rear panel onto the oven.
AVOID OVERGREASING.
Figure 4-6 - Rear panel access
Remove six (6)
screws to remove
rear panel
Bearings
(2 total)
Grease fitting
(1 per
bearing)
Blower belt
Blower motor
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. 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.
V. KEY SPARE PARTS KIT - Available sepa-
rately. See Figure 4-7.
Item Qty. Part No. Description
1 1 44695 Conveyor Drive Motor w/Pickup Assy.
2 2 30153 Drive Motor Brushes
3 1 37337 Kit, Conveyor Speed Controller
4 1 33985 Kit, Thermocouple
5 1 44687 Motor, Blower
6 1 44685 Belt, Blower
7 1 33983 High Limit Control Module, 230V
8 1 97525 Axial Cooling Fan, 230V
9 1 39530 Air Switch, 230V
ELECTRIC OVENS ONLY:
10 1 44585 Relay and Heat Sink Assembly
11a 1 43094 Heating Element, 208V 8 kW
11b 1 44800 Heating Element, 230V 8 kW
11c 1 45281 Heating Element, 380V 8 kW
12 3 44701 Fuse, 60A
13 1 44783 Kit, Digital Temperature Controller
GAS OVENS ONLY:
14 1 36939 Kit, Digital Temperature Controller
15 1 44802 Pilot Assembly
16 1 41647 Modulating Gas Valve, 1/2"
17 1 31651 Amplifier Board
18 1 44801 Combination Gas Control Valve
24
Loosen four (4) screws to adjust
motor position and belt tension
Fig. 4-7 - Key Spare Parts Kit
1
2
3
4
5
9
12
10
6
13
14
7
8
11
15
16
18
17
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
Fig. 5-1 - Wiring diagram, PS536 Gas Oven
208/230V, 60 Hz, 1 Ph
PICKUP
SWITCH
CONVEYOR
240V PRI.
120V SEC.
TRANSFORMER
CONVEYOR SPEED CONTROLLER
DRIVE
CIRCUIT BREAKER 2A
MOTOR
SAFETY
SWITCH
COMPARTMENT
SAFETY
SWITCH
MACHINERY
COMPARTMENT
MOTOR
CONVEYOR SPEED CONTROLLER
SPLIT BELT OVENS ONLY
PICKUP
DRIVE
MOTOR
SWITCH
BLOWER
240V PRI.
TRANSFORMER
AIR
SWITCH
PRESSURE
24V SEC.
VALVE
COMBINATION
GAS CONTROL
ENGLISH
CONTROLLER
TEMPERATURE
COUPLE
THERMO-
COUPLE
THERMO-
FAN
COOLING
FAN
COOLING
MOTOR
BLOWER
RESET LAMP
TERMINAL BLOCK
MODULE
CONTROL
HIGH LIMIT
L2 N
L1
RESET
SWITCH
15A
CIRCUIT
BREAKER
CONTACTOR
IMPORTANT
An electrical wiring diagram for the oven is also located inside the machinery compartment.
VALVE
MODULATING
BOARD
AMPLIFIER
25
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
ENGLISH
208V PRI.
120V SEC.
TRANSFORMER
2A
CIRCUIT
BREAKER
SWITCH
CONVEYOR
CONVEYOR SPEED CONTROLLER
Fig. 5-2 - Wiring diagram, PS536 Electric Oven
208/230V, 60 Hz, 3 Ph
PICKUP
DRIVE
MOTOR
CONVEYOR SPEED CONTROLLER
SPLIT BELT OVENS ONLY
PICKUP
DRIVE
MOTOR
RESET LAMP
MODULE
CONTROL
HIGH LIMIT
60A
FUSES
COUPLE
THERMO-
RESET
SWITCH
MOTOR
SAFETY
SWITCH
COMPARTMENT
SAFETY
SWITCH
MACHINERY
COMPARTMENT
15A
CIRCUIT
BREAKER
RELAY
3-PHASE
CONTACTOR
FAN
COOLING
FAN
COOLING
MOTOR
BLOWER
SWITCH
BLOWER
COUPLE
THERMO-
AIR
TEMPERATURE CONTROLLER
SWITCH
PRESSURE
8kW
HEATER
L2 L3
TERMINAL BLOCK
L1
An electrical wiring diagram for the oven is also located inside the machinery compartment.
IMPORTANT
26
8kW
HEATER
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