Middleby Marshall Oven PS555-E Service Manual

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PS555 Gas & Electric Domestic & Std. Export ENGLISH/French/Spanish
P/N 44827
Rev. B  V1  12/00
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ENGLISH
page 29
FRANÇAIS
PS555 Gas and Electric Ovens
Model:
PS555
Combinations:
Single Oven  Double Oven (Two-Stack)  Triple Oven (Three-Stack)  Quad Oven (Four-Stack)
OWNER'S OPERATING AND INSTALLATION MANUAL
PS555 GAS
página 57
ESPAÑOL
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
Middleby Cooking Systems Group  1400 Toastmaster Drive  Elgin, IL 60120  (847)741-3300  FAX (847)741-4406
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PS555 ELECTRIC
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NOTICE:
Owner's Operating and Installation Manual should be given to the user. The operator of the oven should
This be familiar with the functions and operation of the oven.
This manual must be kept in a prominent, easily reachable location near the oven.
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
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TABLE OF CONTENTS
page page
SECTION 1 - DESCRIPTION ................................................... 4
V. FINAL ASSEMBLY ................................................... 10
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
VI. ELECTRICAL SUPPLY ........................................... 10
A. Additional Information - Gas Ovens ................ 10
B. Additional Information - Electric Ovens .......... 10
C. Connection ...................................................... 10
VII. GAS SUPPLY .......................................................... 11
A. Gas Utility Rough-In Recommendations ....... 11
B. Connection ...................................................... 12
C. Gas Conversion .............................................. 12
SECTION 3 - OPERATION ..................................................... 1 3
I. LOCATION AND DESCRIPTION OF CONTROLS .13
A. BLOWER ( ) Switch ...................................... 13
B. HEAT (
C. CONVEYOR (
D. Conveyor Speed Controller .............................13
E. Digital Temperature Controller ....................... 13
F. Machinery Cpt. Access Panel Safety Switch .. 13
) Switch ............................................ 1 3
) Switch ...............................13
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A. Dimensions ...................................................... 4
B. General Specifications ..................................... 4
C. Electrical Specifications for Electric Ovens ..... 4
D. Electrical Specifications for Gas Ovens .......... 5
E. Gas Orifice and Pressure Specifications........ 5
SECTION 2 - INSTALLATION .................................................. 5
I. BASE PAD KIT.......................................................... 6
II. INSTALLATION KIT .................................................. 7
III. VENTILATION SYSTEM ........................................... 7
A. Requirements .................................................. 7
B. Recommendations .......................................... 7
C. Other Ventilation Concerns .............................. 7
IV. ASSEMBLY ............................................................... 8
A. Base Pad, Legs, Casters, and Stacking ......... 8
B. Restraint Cable Installation ............................. 8
C. Conveyor Installation ........................................ 8
II. NORMAL OPERATION, STEP-BY-STEP ................14
A. Daily Startup Procedures ................................ 14
B. Daily Shutdown Procedures ........................... 14
III. QUICK REFERENCE: DIGITAL TEMP CONTROL. 15
IV. QUICK REFERENCE: TROUBLESHOOTING ....... 16
SECTION 4 - MAINTENANCE ................................................. 17
I. MAINTENANCE - DAILY .......................................... 17
II. MAINTENANCE - MONTHLY .................................. 18
III. MAINTENANCE - EVERY 3 MONTHS .................... 19
IV. MAINTENANCE - EVERY 6 MONTHS ....................20
V. KEY SPARE PARTS KIT ......................................... 21
SECTION 5 - ELECTRICAL WIRING DIAGRAMS ................... 22
I. SCHEMATIC, GAS 208/240V ..................................22
II. WIRING DIAGRAM, GAS 208/240V ........................ 23
III. SCHEMATIC, ELECTRIC 208V or 240V ................ 24
IV. WIRING DIAGRAM, ELECTRIC 208V or 240V ....... 25
V. SCHEMATIC, ELECTRIC 380V or 480V ................ 26
VI. WIRING DIAGRAM, ELECTRIC 380V or 480V ....... 27
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SECTION 1 - DESCRIPTION
I. OVEN USES
PS555 Ovens can be used to bake and/or cook a wide
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variety of food products, such as pizza, pizza-type products, cookies, sandwiches and others.
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. Conveyor End Stop and Rear Stop: Prevent food 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 access food products inside
the baking chamber.
I. Machinery Compartment Access Panel: Allows access
to the oven's interior and control components. No user­servicable parts are located in the machinery compart­ment.
J. Serial Plate: Provides specifications for the oven that affect
installation and operation. Refer to Section 2, for details.
III. OVEN SPECIFICATIONS
Installation,
K. Control Panel: Location of the operating controls for the
oven. Refer to Section 3,
Not Shown:
L. Gas Burner (gas ovens) or Heating Elements (electric
ovens): Heat air, which is then projected to the air fingers
by the blowers.
M. Blowers: Project hot air from the burner or heating ele-
ments to the air fingers.
N. Air Fingers: Project streams of hot air onto the food product.
Figure 1-1 - Oven Components
Operation, for details.
G
F
D
H
I
J
B
E
C
K
A
Table 1-1: Dimensions Single Oven Double Oven Triple Oven Quad Oven
Overall Height (inc. top and legs, as appropriate)
Overall Depth (inc. rear shrouds) 63-3/8 (1610mm) 63-3/8 (1610mm) 63-3/8 (1610mm) 63-3/8 (1610mm)
Overall Length 91 (2311mm) 91 (2311mm) 91 (2311mm) 91 (2311mm)
Conveyor Width 32 (813mm) 32 (813mm) 32 (813mm) 32 (813mm)
Recommended Minimum Clearances
Rear of Oven (inc. rear shrouds) to Wall Conveyor Extension to Wall (both ends)
Table 1-2: General Specifications (per oven cavity)
Weight 1175 lbs. (533kg)
Rated Heat Input, Gas Ovens 150,000 BTU (37,800 kcal, 44 kW/hr)
Rated Heat Input, Electric Ovens 32kW
Maximum Operating Temperature 550°F / 288°C
Air Blowers Two blowers at 1400 ft.3/min. (39.6m3/min.) at 2050 RPM, 0.40" (1.0cm) Water Static Pressure
Average Air Jet Velocity 2600 ft./min. (1320cm/sec.) average
Warmup Time 15 min.
Table 1-3: Electrical specifications for electric ovens (per oven cavity)
Main Blower Current Draw (per line) k W
Voltage Control Circuit Voltage Phase Freq L1 L2 L3 N Rating Poles Wires
208V 120V conveyor speed controller (w/transformer); 3 Ph 50/60Hz 97.4A 88.8A 97.4A -- 32kW 3 Pole 4 Wire
220-240V 120V conveyor speed controller (w/transformer); 3 Ph 50/60Hz 83.0- 75.0- 83.0- -- 29.3- 3 Pole 4 Wire
480V 120 V conveyor speed controller (w/transformer); 3 Ph 50/60Hz 38.5A 38.5A 47.7A 9.2A 32kW 4 Pole 5 Wire (3 hot,
all other control circuits 208V (3 hot, 1 gd)
all other control circuits 220-240V 90.0A 86.0A 90.0A 34.8kW (3 hot, 1 gd)
all other control circuits 240V 1 neut, 1 gnd)
46-1/8 (1172mm) 60-1/8 (1527mm) 62-1/2 (1588mm) 78 (1981mm)
or 2x15" (381mm) or 2x15" (381mm) or 2x15" (381mm) or 2x15" (381mm)
6" (152mm) 6" (152mm) 6" (152mm) 6" (152mm)
0" (0 mm) 0" (0 mm) 0" (0 mm) 0" (0 mm)
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Table 1-4: Electrical specifications for gas ovens (per oven cavity)
Main Blower Voltage Control Circuit Voltage Phase Freq Current Draw Poles Wires
208-240V 120 V conveyor speed controller (w/transformer); 1 Ph 50/60Hz 12A 2 Pole 3 Wire (2 hot, 1 gd)
all other control circuits 208/240V
Table 1-5: Gas orifice and pressure specifications for gas ovens (per oven cavity)
Gas Type Main Orifice I.D. Pilot Orifice I.D. Supply (Inlet) Pressure Pressure
Natural 0.228 (5.79mm) 0.028 (0.71mm) 6-12 W.C. (14.9-29.9mbar) 3.5 W.C. (8.7mbar)
Propane 0.141 (3.58mm) 0.018 (0.46mm) 11-14 W.C. (27.4-34.9mbar) 10 W.C. (24.9mbar)
Orifice (Manifold)
IMPORTANT
Additional electrical information is provided on the oven's serial plate, and on the wiring diagram inside the machinery compartment.
SECTION 2 - INSTALLATION
WARNING - After any conversions, readjustments, or service work on the oven:
Perform a gas leak test.  Test for correct air supply, particularly to the
burner blower.
WARNING - Keep the appliance area free and clear of combustibles.
WARNING - The oven must be installed on an even (level) non-flammable flooring and any adjacent walls must be non-flammable. Recommended minimum clearances are specified in the Description section of this Manual.
WARNING - Do not obstruct the flow of combustion and ventilation air to and from your oven. There must be no obstructions around or underneath the oven. Constructional changes to the area where the oven is installed shall not affect the air supply to the oven.
Test for proper combustion and gas supply.  Check that the ventilation system is in operation.
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CAUTION: To reduce the risk of fire, the appliance is to be mounted on floors of noncombustible construction with noncombustible flooring and surface finish and with no combustible material against the underside thereof, or on noncombustible slabs or arches having no combustible material against the underside thereof, such construction shall in all cases extend not less than 12 inches (304.8mm) beyond the equipment on all sides.
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 requirements 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 electrically grounded in accordance with local codes, or in the absence of local codes, with the Canadian Electrical Code CSA C22.2.
NOTE: In Australia, the oven installation must conform with any requirements of the appropriate statutory authority. Gas oven installtions must conform with AGA Code, AG601.
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SECTION 2 - INSTALLATION
ENGLISH
Fig. 2-1 - Base Pad Kit
1
9
2
8
7
3
12
13
14
6
4
11
10
5
I. BASE PAD KIT - see Figure 2-1
NOTE: One Base Pad Kit is required for each Single, Double, Triple, or Quad Oven installation.
Quantity
Item
ADDITIONAL COMPONENTS FOR GAS OVENS:
102222227271-0004 Pipe Clamp, 1-1/2
112222233120-0055 Nipple, 1-14 dia. X 3 (76mm) L, NPT
122222223122-0007 Elbow, 90°, 1-1/4 dia.
131111122361-0003 Gas Hose, 1-1/4 dia. X 72 (1829mm) L
141111133120-0056 Gas Pipe, 1-1/4 dia. X 54 (1372mm) L
Single oven w/10" legs w/15" legs Triple oven Quad oven
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
3 4 4 4 4 -- 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)
6 4 4 4 4 -- 22450-0028 Adjustable Leg
71111122450-0253 Restraint Cable, 60 (1524mm)
81111121392-0005 Eye Bolt/Lag Screw
922222 41582 Top Cover (Right or Left)
--11111 41643 Base Pad, Insulated
--8888821256-0069 Screw, 10-32 X 1-1/4 Sl Trus Hd
-- 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"
--2222221292-0001 Screw, 10-16 X 3/4 Hex Wshr Hd #2pt
Double oven Double oven
Part No. Description
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II. INSTALLATION KIT - see Figure 2-2
NOTE: One Installation Kit is required for each oven cavity.
SECTION 2 - INSTALLATION
Fig. 2-2 - Installation Kit
15
2
Item Qty. Part No. Description
1 1 35900-0148 Conveyor Rear Stop
2 1 35000-1103 Conveyor End Stop
3 1 44827 Owner's Operating & Installation Manual
4 1 1002040 Authorized Service Agency Listing
ADDITIONAL COMPONENTS FOR GAS OVENS:
5 1 33120-0053 Gas Pipe Nipple
III. VENTILATION SYSTEM
CODES SUPERSEDE THE RECOMMENDATIONS SHOWN IN THIS MANUAL.
IMPORTANT
Where national or local codes require the
installation of fire suppression equipment 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 EXPENSES
FOR THE OWNER
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
A. Requirements
CAUTION
Gas oven installations
REQUIRE a mechanically driven
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.
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 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
B. Recommendations
NOTE THAT THE HOOD DIMENSIONS SHOWN IN FIGURE 2­3 ARE
RECOMMENDATIONS ONLY. LOCAL, NATIONAL, AND
Inadequate ventilation can inhibit oven performance.
It is recommended that the ventilation system and duct INTERNATIONAL CODES MUST BE FOLLOWED WHEN INSTALLING THE VENTILATION SYSTEM. ANY APPLICABLE
34
ENGLISH
must not
services of a ventilation engineer or specialist.
work be checked at prevailing intervals as specified by the hood manufacturer and/or HVAC engineer or specialist.
18 (458mm)
minimum (Typical - both ends of oven)
Fig. 2-3 - Ventilation System
2 (51mm)
minimum
7
8 (203mm)
minimum
3 (76mm)
minimum
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SECTION 2 - 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
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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. If necessary, 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. Conveyor Installation
NOTE
Split belt conveyors can only be installed from the end of the
with the drive motor.
oven
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
1/2"
flat washer
1/2" lock
washer
1/2"-13 x 1-1/4"
hex screw
Leg uses OUTSIDE
hole (closest to front
or rear of oven)
Left or Right Side
of oven
Caster
uses
INSIDE
hole
Figure 2-5 - Legs and Casters for Triple Oven
Front or Rear
of oven
Leg uses OUTSIDE
hole (closest to front
or rear of oven)
Left or Right Side
of oven
Caster uses
INSIDE hole
Figure 2-6 - Legs and Casters for Quad Oven
3/8" flat
washer
3/8" lock
washer
Left or Right Side
of oven
Locking casters -
FRONT of oven
Non-locking casters -
REAR of oven
3/8"-16 x 1"
hex screw
Front or Rear
of oven
1/2" flat
washer
1/2" lock
washer
1/2"-13 x 1-1/4"
hex screw
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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 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.
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" (75­100mm). 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.
SECTION 2 - INSTALLATION
Figure 2-7 - Installing the Restraint Cable
Restraint cable
3/4 (19mm)
assembly
eyebolt
Wall of
structure
Eyebolt in
base pad
Rear surface of oven base
pad
Figure 2-8 - Removing the Conveyor Drive Sprocket
Loosen conveyor collar
set screw, then pull
sprocket straight out
Figure 2-9 - Inserting the Conveyor
1
2
4
Retainer
3
End plug
ENGLISH
Figure 2-10 - Checking the conveyor tension
3-4" (75-100mm)
vertical deflection
Conveyor
tension
adjustment
screws (idler
end only)
Figure 2-11 - Conveyor and Master Link Orientation
Direction of travel
Outside master link
orientation
9
CORRECT master link
position
Incorrect
master link
position
Inside master link
orientation
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SECTION 2 - INSTALLATION
V. FINAL ASSEMBLY
1. 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.
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2. Press the conveyor end stop and rear stop down over the edge of the conveyor frame. See Figure 1-1 (in Section 1, Description).
VI. ELECTRICAL SUPPLY
Swing outside
edge of tray
up and into
place
Figure 2-12 - Crumb trays
Place inside edge of tray on retainer bracket
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 Table 1-4, Electrical Specifications (in Section 1, Description).
A. Additional Information - Gas Ovens
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.
B. Additional Information - Electric Ovens
A 2" (51mm) 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 inside the side compartment of the oven.
Using flexible cables for the electric power supply conductors requires a 2" (51mm) 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.
The oven requires a ground connection to the oven ground screw. For gas ovens, the ground screw is located in the electrical junction box (see Figure 2-13). For electric ovens, the ground screw is located inside the side compartment of the oven (see Figure 2-14). If necessary, have the electrician supply the ground wire. Do NOT use the wiring conduit or other piping
for ground connections!
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.
10
Page 11
Figure 2-13 - Utility Connection Locations for Gas Ovens
Electrical
Junction Box
One per oven
cavity
Gas Inlet
One per Single,
Double, Triple, or Quad Oven
Figure 2-14 - Utility Connection Locations for Electric Ovens
SECTION 2 - INSTALLATION
ENGLISH
2" (51mm)
cutcout for
electrical supply
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 the manual shutoff valve
very slowly.
very important to open
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.
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
One or two oven cavities: 750 cfh meter  Three or four oven cavities: 1200 cfh meter
Gas Line
DEDICATED LINE from the gas meter to the oven  2-1/2" (63.5mm) pipe for natural gas  2" (50.8mm) pipe for propane  Maximum length: 200' (61m). Each 90° elbow equals 7'
(2.13m) of pipe.
11
Page 12
SECTION 2 - INSTALLATION
B. 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).
ENGLISH
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 2-15; however, compliance with the applicable standards and regulations is mandatory.
Inlet, regulated, and pilot gas pressure readings can be taken using a U tube manometer at the tap locations shown in Figure 2-16.
NOTE
The installation must conform with local codes or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1­latest 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 appli­cable, Connectors for Movable Gas Appliances, CAN/CGA-6.16 (in Canada), as well as a quick-disconnect device that com-
plies with the Standard for Quick-Disconnect Devices for Use With Gas Fuel, ANSI Z21.41 (in U.S.A.), or, if applicable, Quick­Disconnect 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.
Figure 2-15 - Flexible Gas Hose Installation
To Gas
Supply Pipe
Full-Flow
Gas
Shutoff
Valve
90°
Flexible
Gas Hose
Elbow
Union OR quick-
disconnect device
90°
Elbow
Gas line for
other oven
cavities
Nipple, 1-1/4
dia. X 3
(76mm) L, NPT
Figure 2-16 - Gas Burner and Piping Assembly
Manual shutoff
valve
Combination Gas
Control Valve
(Safety Regulator)
Elbow, 90°,
1-1/4 dia.
Pilot pressure tap
(where pilot gas
pressure is measured)
Cap for top
oven cavity
Modulating
gas valve
12
Inlet pressure
tap (where
incoming gas
pressure is measured)
Gas Pipe, 1-1/4
dia. X 54
(1372mm) L
Gas Burner
Manifold
pressure tap (where manifold gas pressure is
measured)
On/Off Knob
Always leave in
ON position
Burner Blower
Page 13
SECTION 3 - OPERATION
I. LOCATION AND DESCRIPTION OF CONTROLS
Fig. 3-1 - Control Panel
E.
Digital Temperature
(
) controller
A.
"BLOWER"
) switch
(
D.
Conveyor Speed
( ) controller(s)
B.
"HEAT"
) switch
(
ENGLISH
C.
"CONVEYOR"
( ) switch
A.
"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.
D.
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."
B.
C.
"HEAT" Switch: Allows the burner or heating
elements, as appropriate for the oven model, to activate. Activation is determined by the set­tings on the Digital Temperature Controller.
"CONVEYOR" Switch: Turns the conveyor drive motor on and off.
E.
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.
NOT SHOWN:
F. Machinery Compartment Access Panel Safety 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.
13
Page 14
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 is closed.
2. Turn the "BLOWER" ( ) switch to the ON ("I") position.
3. Turn the "CONVEYOR"
) switch to the ON
( ("I") position.
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.
8. (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.
9. Allow the oven to preheat for 10 minutes after it has reached the set point temperature.
B. DAILY SHUTDOWN PROCEDURE
) key to show
wait
for
4. If necessary, adjust the conveyor speed setting by pressing the pushbuttons on the con­veyor speed controller to change the displayed bake time.
5. Adjust the temperature controller to a desired set temperature, if neces­sary.
Press the Set Point
and Unlock keys at the same time. Wait for the "SET PT" light to turn on.
Press the Up Arrow
and Down Arrow Keys as necessary to adjust the set­point.
6. Turn the "HEAT" ( switch to the "ON" ("I") position, and wait for the "HEAT ON" light to turn on.
or
1. Turn the "HEAT" ( "BLOWER" ( ches to the "OFF" ("O")
position. Note that the blowers will remain in op-
or
wait
+
for
or
)
eration until the oven has cooled to below 200°F (93°C).
2. Make certain that there are no products left on the conveyor inside the oven. Turn the "CON­VEYOR" ( the "OFF" ("O") position.
3. Open the window to allow the oven to cool faster.
4. After the oven has cooled and the blowers have turned off, switch the circuit breaker/fused disconnect to the off posi­tion.
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" ( (
) switches to the "OFF" ("O") position. Wait for AT LEAST FIVE MINUTES before restarting the oven. Then, repeat the Daily Startup procedure.
) and
) swit-
+
) switch to
IMPORTANT
), "BLOWER" ( ), and "CONVEYOR"
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
wait
for
FOR LESS THAN 5 MINUTES, MINUTES BEFORE RESTARTING THE OVEN.
The burner will not operate and gas will not flow through the burner without electric power. No attempt should be made to operate the oven during a power failure.
WAIT FOR AT LEAST FIVE
14
Page 15
III. QUICK REFERENCE: DIGITAL TEMPERATURE CONTROLLER
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 ence: Troubleshoot­ing in this section.
Temperature Key
Press this key once to view the Actual Tem­perature in the Dis­play.
Quick Refer-
Display
Shows the Set Point or the Actual Tempera­ture 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 Tempera­ture is shown in the display.
Service Key
For use by ser­vice personnel only.
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 Key and Unlock Key in this section.
Set Point
15
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.
Page 16
SECTION 3 - OPERATION
IV. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM PROBLEM SOLUTION
ENGLISH
light is lit, food product is
undercooked
Oven will not
turn on at all
Oven shuts down shortly
after it is turned on
(gas ovens only)
appears in display, oven is not heating
The oven temperature ex­ceeded 650°F (343°C), and the burner or heating ele­ments were automatically shut down.
Electrical power may not be reaching the oven, or the controls may be set incor­rectly.
The gas burner did not light within 90 seconds of turn­ing the "HEAT" ( to the ON ("I") position. This automatically en­gages a safety lockout mode.
The oven did not reach 200°F (93°C) within 15 min­utes of startup, and the oven has stopped heating.
) Switch
Follow the procedures under Daily Shutdown Procedures in
this section to shut down the oven. Contact your Middleby Marshall Authorized Service Agent to determine and correct the cause of the condition to prevent damage to the oven.
Check that the circuit breaker/fused disconnect is turned on.
Check that the "BLOWER"
position. The burner cannot engage until the blowers are in operation.
Turn the "HEAT" (
)switches to the "OFF" ("O") position.
(
Wait for AT LEAST FIVE MINUTES before restarting the oven.
Repeat the Daily Startup procedure.
Turn the "HEAT" (
)switches to the "OFF" ("O") position.
(
Wait for AT LEAST FIVE MINUTES before restarting the oven.
Repeat the Daily Startup procedure.
( ) Switch is in the ON ("I")
), "BLOWER" ( ), and "CONVEYOR"
), "BLOWER" ( ), and "CONVEYOR"
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
Food products are
overcooked or
undercooked.
Controls may be set incor­rectly.
Air fingers may have been reassembled incorrectly after cleaning.
Conveyor may be jammed on an object in the oven, or conveyor belt or drive chain tension may be incorrect.
Controls may be set incor­rectly.
Check that the Set Point is correctly set.
Check that both the "BLOWER"
are in the ON ("I") position.
If the oven still will not heat,turn the "HEAT" (
( ), 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,
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,
the conveyor and drive chain tension.
Check that the set temperature and bake time settings are
correct.
Maintenance, for instructions on reassem-
Maintenance, for instructions on checking
( ) and "HEAT" ( ) Switches
), "BLOWER"
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.
16
Page 17
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)
3. If it is necessary to move the oven for cleaning or servicing, disconnect the gas supply connection before moving the oven.
and disconnect the electric supply to the oven.
When all cleaning and servicing is complete:
1. If the oven was moved for servicing, return the oven to its original location.
2. 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 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.
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 the front cooling fans, as follows:
 Snap off the protective grille, and wipe it clean with a cloth.
See Figure 4-1.
 Remove the foam filter and inspect it. If it is dusty, shake
it briskly. If dirt or grease is present on the filter, wash it in warm, soapy water. Rinse the filter, squeeze it to remove as much of the water as possible, and then set it aside to dry thoroughly before reinstallation.
 Once the filter is dry, reinstall the filter and grille.
D. Clean the motor shroud and rear grills using a stiff nylon
brush. Refer to Figure 4-2 for the locations of the grills.
E. 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 damage the oven's internal components.
F. 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.
G. Remove and clean the crumb trays. When reinstalling the
trays, refer to Figure 2-12 (in Section 2,
Installation).
Figure 4-2 - Rear Grills and Motor Shroud Grill
Grills on top
and bottom
of rear
shrouds (4)
17
Figure 4-1 - Front Cooling Fans
Foam filter
Protective grill
Grills on inside
face of rear
shrouds (2 - gas
ovens only)
Grills on rear of rear shrouds (2)
Grill on top of
conveyor motor
shroud
Grills on end
shrouds (4)
ENGLISH
( )
Page 18
SECTION 4 - MAINTENANCE
II. MAINTENANCE - MONTHLY
NOTE
When removing the conveyor, refer to Figure 2-9 (in Section 2, Installation).
ENGLISH
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
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 tions (in Section 2,
E. Remove the end plugs from the oven. The end plugs are
shown in Figure 1-1 (in Section 1,
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 "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.
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, 3-4" (75-100mm). DO NOT OVERTIGHTEN THE CON­VEYOR BELT. If necessary, the belt tension can be ad­justed by turning the conveyor adjustment screws, located at the idler (right) end of the conveyor.
N. Replace the crumb trays and drive motor shroud.
with the drive motor.
Conveyor Installation instruc-
Installation).
Description).
Installation). The belt should lift between
18
Figure 4-3 - Removing Air Fingers and Plates
Figure 4-4 - Disassembling the Air Fingers
Manifold
Inner plate
Outer Plate
2
Pull outer plate
straight up
and off
Swing ends of inner plate and
3
manifold apart
4
Pull inner plate
upwards, and
then away from
manifold
1
Step on lip of manifold
Page 19
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.
SECTION 4 - 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.
D. Split Belt Disassembly and Cleaning
For split belt ovens ONLY, disassemble, clean and lubri­cate 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. Remem­ber that unequal-width split belt ovens should AL­WAYS have the narrower belt at the front of the oven.
7. Reassemble the idler shaft into the conveyor. 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. Remem­ber that unequal-width split belt ovens should AL­WAYS have the narrower belt at the front of the oven.
13. Reassemble the drive shaft into the conveyor. 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 exten­sions onto the oven.
Make
Check
Figure 4-5 - Split Belt Idler Shaft
ENGLISH
Conveyor
adjustment
screw
Figure 4-6 - Split Belt Drive Shaft
Locking collar
Figure 4-7 - Washer and Spacer
Bronze washer on
BOTH idler and
drive shafts
Nylon spacer
on drive shaft
ONLY
19
Page 20
SECTION 4 - 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.
ENGLISH
If access to the blower motors is required, remove the three mounting screws (two on the front of each shroud, one on the rear). Then, lift the end shroud straight up and off its 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) deflec­tion 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. Excessive greasing may cause harm to the bearing.
AVOID OVERGREASING.
Figure 4-8 - Rear Shrouds and Guard Plates
End shroud screws
(3 per shroud - 1
rear, 2 front)
Rear shroud screws
(4 per shroud for gas
ovens, 5 per shroud
for electric ovens)
Rear shroud -
remove FIRST.
Access to bearing
and fan belt
remove SECOND (if
Access to blower
Figure 4-9 - Fan Belt Tension
At least 1" (25mm)
deflection
End shroud -
necessary).
motor
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 bear­ings.
4. Replace the shrouds onto 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. For gas ovens, clean and inspect the burner nozzle and
electrode assembly.
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.
Fan not shown -
see above
To adjust belt
tension, loosen 4
bolts and
reposition motor
Figure 4-10 - Lubricating the Bearings
Grease fittings
(1 per bearing, 4
total)
20
Page 21
V. KEY SPARE PARTS KIT - Available separately. See Figure 4-11.
A. Gas Ovens B. Electric Ovens
Item Qty. Part No. Description Item Qty. Part No. Description
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 39530 Air Switch
10 1 42810-0114 Kit, Ignition Module
11 1 38811 Assembly, Burner Blower/Motor
12 1 41647 Valve, Modulating Gas, 1/2"
13 1 31651 Amplifier, Modulating Valve
14 1 33983 High limit control module, 240V
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
14 1 33983 High limit control module, 240V
15a 1 43337 Heating element, 208V
15b 1 44525 Heating element, 230V
15c 1 44526 Heating element, 380V
15d 1 44527 Heating element, 480V
16 1 28041-0008 Contactor
17 1 31504 Transformer, 230Vp:120Vs
18 1 44549 Contactor
19 1 35018 Circuit breaker block, 3-pole, 50A
20a 1 44568 Controller (380V & 480V ovens)
20b 1 44914 Controller (208V, 230V, & 240V ovens)
SECTION 4 - MAINTENANCE
ENGLISH
1
Fig. 4-11 - Key Spare Parts Kit
5
2
6
7
3
4
9
10
8
11
12
13
14
15
16
17
21
18
19
20
Page 22
Fig. 5-1
Schematic, PS555 Gas Oven, 208/240V, 60Hz, 1 Ph
ENGLISH
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
22
CIRCUIT
BREAKER
CIRCUIT
BREAKER
BLOWER
MOTORS
TEMP (T2)
RESET
SWITCH
TEMP (T2)
HIGH LIMIT
HIGH LIMIT
THERMOSTAT
CONTACT (T2)
TEMP (T2)
RESET
SWITCH
LIGHT
DOOR SWITCH
DOOR SWITCH
DOOR SWITCH
SECOND CONVEYOR CONTROL
FOR USE IN SPLIT BELT
APPLICATIONS ONLY
TRANSFORMER
230V PRI.
120V SEC.
0.2 KVA
CONVEYOR
CONTROL
COOLDOWN SWITCH (T1)
BLOWER
SWITCH
DOOR
SWITCH
COOLING FAN
COOLING FAN
TEMPERATURE CONTROL (T1)
BURNER BLOWER
MOTOR
TRANSFORMER
240V PRI.
24V SEC.
0.05 KVA
SIGNAL CONDI­TIONER
MODULATING
GAS VALVE
IGNITOR
PILOT
SENSOR
IGNITION
MODULE
COMBINATION
GAS VALVE
IMPORTANT
An electrical wiring diagram for the oven is also located inside the machinery compartment.
Page 23
Fig. 5-2
Wiring diagram, PS555 Gas Oven, 208/240V, 60Hz, 1 Ph
SAFETY SWITCH
LEFT REAR
SAFETY SWITCH
RIGHT REAR
SAFETY SWITCH
LEFT FRONT
23
CIRCUIT
BREAKERS
CONTACTOR
RUN
THERMO-
COUPLES
START
TERMINAL
BLOCK
BLOWER
MOTOR
TEMPERATURE
CONTROLLER
CIRCUIT
BREAKERS
RESET SWITCH
LAMP
RESET SWITCH
SAFETY SWITCH
RIGHT FRONT
COMBINATION
GAS VALVE
HIGH LIMIT
CONTROL MODULE
AIR SWITCH 2
COOLING FAN RIGHT
THERMO-
COUPLE
AIR SWITCH 1
HEAT SWITCH
IGNITION
MODULE
TRANSFORMER
230Vp:120Vs
SELECTOR
WITH
DISPLAY
CONVEYOR
SWITCH
CONVEYOR SPEED
CONTROLLER
PICKUP
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
CONVEYOR
MOTOR
COOLING
FAN LEFT
AMPLIFIER
BOARD
AIR SWITCH 3
MODULATING
GAS VALVE
TRANSFORMER
230Vp:24Vs
65VA
BURNER BLOWER
ENGLISH
Page 24
ENGLISH
24
CIRCUIT
BREAKER
Fig. 5-3
Schematic, PS555 Electric Oven, 208V or 240V, 60Hz, 3 Ph
TEMP (T2)
RESET
SWITCH
TEMP (T2)
HIGH LIMIT THERMOSTAT CONTACT (T2)
HIGH LIMIT
TEMP (T2)
RESET
SWITCH
LIGHT
DOOR SWITCH
DOOR SWITCH
DOOR SWITCH
TRANSFORMER
230V PRI. 120V SEC.
0.2 KVA
CONVEYOR
SWITCH
SECOND CONVEYOR CONTROL
FOR USE IN SPLIT BELT
APPLICATIONS ONLY
SWITCH
SWITCH
CONVEYOR
CONTROL
COOLDOWN
BLOWER
HALL EFFECT
SENSORS
DOOR
SWITCH
COOLING FAN
COOLING FAN
SSR COOLING FAN
SSR COOLING FAN
AIR PRESSURE
SWITCH
MAIN BLOWER
TEMPERA-
TURE
CONTROL-
LER
HEAT
CONTACT
HEAT
SWITCH
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
Page 25
25
CIRCUIT
BREAKER
COOLING
HEATING ELEMENTS
208V OR 230V 8kW
BLOCK
FAN
CONTACTOR
SOLID STATE RELAY
TERMINAL
BLOCK
Fig. 5-4
Wiring diagram, PS555 Electric Oven, 208V or 240V, 60Hz, 3 Ph
RED/
BLK
TERMINAL
BLOCKS
BLOWER
MOTORS
CONTAC-
TOR
CIRCUIT
BREAKERS
TERMINAL
BLOCK
LAMP
THERMOCOUPLES
COOLING
FAN LEFT
COOLING
FAN RIGHT
SWITCH
TEMPERATURE
CONTROLLER
WHT
RED
HIGH LIMIT
CONTROL MODULE
RESET
THERMO-
COUPLE
SWITCH
START
CAPACITOR
RUN
CAPACITOR
PURPLE
BLU
BRN
BLOWER SWITCH
HEAT
SWITCH
RIGHT
SWITCH
SAFETY SWITCH
AIR
AIR
LEFT
SAFETY SWITCH
SAFETY SWITCH
SAFETY SWITCH
FRONT PANEL
GROUND
CONVEYOR
SWITCH
CONVEYOR
SPEED
CONTROLLER
DIGITAL
DISPLAY AND
SELECTOR
DC DRIVE
MOTOR
PICKUP
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
IMPORTANT
An electrical wiring diagram for the oven is also located inside the machinery compartment.
ENGLISH
Page 26
página 57
ESPAÑOL
page 29
FRANÇAIS
page 1
ENGLISH
26
CIRCUIT
BREAKER
Fig. 5-5
Schematic, PS555 Electric Oven, 380V or 480V, 60Hz, 3 Ph
TEMP (T2)
RESET
SWITCH
TEMP (T2)
HIGH LIMIT
THERMOSTAT
CONTACT (T2)
HIGH LIMIT
TEMP (T2)
RESET
SWITCH
LIGHT
DOOR SWITCH
DOOR SWITCH
DOOR SWITCH
TRANSFORMER
230V PRI.
120V SEC.
0.2 KVA
CONVEYOR
SWITCH
SECOND CONVEYOR CONTROL
FOR USE IN SPLIT BELT
APPLICATIONS ONLY
SWITCH
BLOWER
SWITCH
CONVEYOR
CONTROL
COOLDOWN
HALL EFFECT
SENSORS
DOOR
SWITCH
COOLING FAN
COOLING FAN
SSR COOLING FAN
SSR COOLING FAN
AIR PRESSURE
SWITCH
MAIN BLOWER
TEMPERA-
TURE
CONTROL-
LER
HEAT
CONTACT
HEAT
SWITCH
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
Page 27
27
CIRCUIT
BREAKER
BLOCK
COOLING
FAN
CONTACTOR
SOLID STATE RELAY
TERMINAL
BLOCK
Fig. 5-6
Wiring diagram, PS555 Electric Oven, 380V or 480V, 60Hz, 3 Ph
RED/
BLK
TERMINAL
BLOCKS
BLOWER MOTORS
CONTAC-
TOR
CIRCUIT
BREAKERS
TERMINAL
BLOCK
LAMP
THERMOCOUPLES
COOLING
FAN LEFT
COOLING
FAN RIGHT
TEMPERATURE
CONTROLLER
WHT
RED
HIGH LIMIT
CONTROL MODULE
RESET
THERMO-
SWITCH
COUPLE
BLOWER
SWITCH
HEAT
SWITCH
START
CAPACITOR
RUN
CAPACITOR
PURPLE
BLU
BRN
SWITCH
RIGHT
SWITCH
SAFETY
SWITCH
AIR
AIR
LEFT
SAFETY SWITCH
SAFETY SWITCH
SAFETY SWITCH
FRONT PANEL
GROUND
CONVEYOR
SWITCH
CONVEYOR
SPEED
CONTROLLER
DIGITAL
DISPLAY AND
SELECTOR
DC DRIVE
MOTOR
PICKUP
SECTION 5 - ELECTRICAL WIRING DIAGRAMS
HEATING ELEMENTS
380V OR 480V 8kW
IMPORTANT
An electrical wiring diagram for the oven is also located inside the machinery compartment.
ESPAÑOL
página 57
FRANÇAIS
page 29
ENGLISH
page 1
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