Middleby Marshall PS360S, PS360Q, PS314, PS360WB, PS310 User Manual

PS300 Series
Gas and Electric (AGA/UL)
ENGLISH/French/Spanish

P/N 41823

Rev. B  V3  5/00

page 1page 25página 49

ENGLISHFRANÇAISESPAÑOL

PS300 Series Gas and Electric Ovens

Models:

 PS310
 PS314
 PS360/360Q/360S
 PS360WB
 PS360EWB
 PS360WB70

Combinations:

 Single Lower Oven
 Single Upper Oven on Stand
 Double Oven (Two-Stack)
 Tandem Oven
 Double (Two-Stack) Tandem Oven

OWNER'S OPERATING

& INSTALLATION

MANUAL

© 2000 Middleby Marshall, Inc.

is a registered trademark of Middleby Marshall, Inc. All rights reserved.

Middleby Cooking Systems Group  1400 Toastmaster Drive  Elgin, IL 60120  [phone]  FAX [phone]

1

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 or control 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 IN YOUR INSTALLATION KIT.

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  [phone]  FAX [phone]

24-Hour Service Hotline: [phone]

www.middleby.com

2

TABLE OF CONTENTS

page page

SECTION 1 - DESCRIPTION .................................................... 4

IV. THERMOCOUPLE INSTALLATION .......................... 9

I. OVEN USES ............................................................. 4

II. OVEN COMPONENTS ............................................. 4

A. Crumb Pans ..................................................... 4

B. Conveyor Drive Motor ........................................ 4

C. Conveyor ........................................................... 4

D. End Plugs ......................................................... 4

E. Serial Plate........................................................ 4

F. Window ............................................................. 4

G. Machinery Compartment Access Panel ........... 4

H. Control Compartment Access Panel ............... 4

I. Control Panel .................................................... 4

J. Eyebrows .......................................................... 4

K. Conveyor End Stop ........................................... 4

L. Gas Burner ........................................................ 4

M. Blowers ............................................................. 4

N. Air Fingers ......................................................... 4

III. OVEN SPECIFICATIONS ......................................... 4

V. TANDEM OVEN ASSEMBLY .................................... 10

VI. CONVEYOR INSTALLATION ................................... 12

A. All Non-Tandem Ovens ................................... 12

B. Tandem Oven Models ..................................... 13

VII. FINAL ASSEMBLY ................................................... 13

VIII. ELECTRICAL SUPPLY ........................................... 14

A. Electric Ovens .................................................. 14

B. Gas Ovens .......................................................14

C. Ovens with External Transformers .................. 14

D. Connection.......................................................14

IX. GAS SUPPLY .......................................................... 15

A. Gas Utility Rough-In Recommedations .......... 15

B. Connection .......................................................15

C. Gas Conversion ............................................... 15

SECTION 3 - OPERATION ...................................................... 1 6

I. LOCATION AND DESCRIPTION OF CONTROLS .. 16

ENGLISH

A. Dimensions ...................................................... 4

B. General Specifications ..................................... 5

C. Gas Orifice and Pressure Specifications ......... 5

D. Electrical Specifications - Gas Ovens .............. 5

E. Electrical Specifications - Electric Ovens ......... 5

SECTION 2 - INSTALLATION .................................................. 6

I. INSTALLATION KIT .................................................. 7

A. Components ..................................................... 7

B. Additional Components - Gas Ovens .............. 7

C. Additional Components - Tandem Ovens ........ 7

II. VENTILATION SYSTEM ............................................ 8

A. Requirements ................................................... 8

B. Recommendations ........................................... 8

C. Other Ventilation Concerns .............................. 8

III. ASSEMBLY ............................................................... 9

A. Stacking ............................................................ 9

A. BLOWER ( ) Switch ...................................... 16

B. HEAT ( ) Switch ............................................ 16

C. CONVEYOR ( ) Switch ............................... 16

D. Conveyor Speed Controller ............................. 16

E. Digital Temperature Controller ........................ 16

F. Machinery Cpt. Access Panel Safety Switch .... 16

II. NORMAL OPERATION, STEP-BY-STEP ................. 17

A. Daily Startup Procedures ................................. 17

B. Daily Shutdown Procedures ............................ 17

III. QUICK REFERENCE: DIGITAL TEMP CONTROL . 18

IV. QUICK REFERENCE: TROUBLESHOOTING ........ 19

SECTION 4 - MAINTENANCE .. ............................................... 20

I. MAINTENANCE - DAILY .......................................... 21

II. MAINTENANCE - MONTHLY ................................... 2 2

III. MAINTENANCE - EVERY 3 MONTHS ..................... 23

IV. MAINTENANCE - EVERY 6 MONTHS ..................... 23

B. Stands ............................................................... 9

V. KEY SPARE PARTS KIT .......................................... 24

3

SECTION 1 - DESCRIPTION

I. OVEN USES

PS300 Series Ovens can be used to bake and/or cook a
wide variety of food products, such as pizza, pizza-type

ENGLISH

products, cookies, sandwiches and others.

II. OVEN COMPONENTS - see Figure 1-1.

A. Crumb Pans: Catch crumbs and other material that drop

through the conveyor belt. One crumb pan is located
underneath each end of the conveyor.

B. Conveyor Drive Motor: Moves the conveyor.
C. Conveyor: Moves the food product through the oven.
D. End Plugs: Allow access to the oven's interior.
E. Serial Plate: Provides specifications for the oven that affect

installation and operation. Refer to Section 2, Installation,
for details.

F. Window (on ovens so equipped): Allows the user to see

and access food products inside the baking chamber.

G. Machinery Compartment Access Panel: Allows access to

the oven's interior components. No user-servicable parts
are located in the machinery compartment.

H. Control Compartment Access Panel: Allows access to the

control components. This panel is combined with the
Machinery Compartment Access Panel on PS360EWB and
WB70 ovens. No user-servicable parts are located in the
control compartment.

I. Control Panel: Location of the operating controls for the

oven. Refer to Section 3, Operation, for details.

J. Eyebrows (on ovens so equipped): Can be adjusted to

various heights to prevent heat loss into the environment.

K. Conveyor End Stop: Prevents food products from falling off

the end of the moving conveyor.

Not Shown:

L. Gas Burner: Heats air, which is then projected to the air

fingers by the blowers.

M. Blowers: Fans that project hot air from the burner to the air

fingers.

N. Air Fingers: Project streams of hot air onto the food product.

Fig. 1-1 - Oven Components

B

C

D

E

F

H

A

G

I

J

K

III. OVEN SPECIFICATIONS

A. Dimensions

Overall Height

Lower oven,
with top & legs

Upper oven,
with stand and top

Double oven
(two-stack)

Overall Depth

i

nc. rear shrouds

and front window
inc. rear shrouds

(no window)

Overall Length

* NOTE: The PS314 and PS360Q dimensions do NOT include the optional end trays.

Conveyor Width

Single Belt

Split Belt,
identical width

Split Belt,
unequal width

Recommended Minimum Clearances

Rear of oven (inc.
rear shrouds) to wall

Conveyor extension
to wall (both ends)

PS310 PS314 PS360/360Q/360S PS360 Tandem PS360WB PS360WB Tandem PS360EWB PS360WB70

45-1/2 45-1/2 45-1/2 45-1/2 45-1/2 45-1/2 45-1/2 45-1/2

1143mm 1143mm 1143mm 1143mm 1143mm 1143mm 1143mm 1143mm

64-1/2" 64-1/2" 64-1/2" 64-1/2" 64-1/2" 64-1/2" 64-1/2" 64-1/2"

1638mm 1638mm 1638mm 1638mm 1638mm 1638mm 1638mm 1638mm

82-1/4 82-1/4 82-1/4 82-1/4 82-1/4 82-1/4 82-1/4 82-1/4

2089mm 2089mm 2089mm 2089mm 2089mm 2089mm 2089mm 2089mm

39 39 47" 47" 55" 55" 60" 55"

991mm 991mm 1194mm 1194mm 1397mm 1397mm 1524mm 1397mm

36" 36" 44" 44" 52" 52" -- --

914mm 914mm 1118mm 1118mm 1321mm 1321mm -- --

90-1/2" 70-3/4"

2299mm 1797mm

24" 24" 32" 32" 40" 40" 44" 40"

610mm 610mm 813mm 813mm 1016mm 1016mm 1118mm 1016mm

-- -- 2x15" 2x15" 2x19" 2x19" 2x21" 2x19"

-- -- -- -- 1x13"/330mm 1x13"/330mm 1x14"/356mm 1x13"/330mm

1" 1" 1" 1" 1" 1" 1" 1"

25mm 25mm 25mm 25mm 25mm 25mm 25mm 25mm

0" 0" 0" 0" 0" 0" 0" 0"

0mm 0mm 0mm 0mm 0mm 0mm 0mm 0mm

*

90-1/2" * 144-1/2" 90-1/2" 144-1/2" 90-1/2" 106"

*

2299mm * 3670mm 2299mm 3670mm 2299mm 2692mm

381mm 381mm 483mm 483mm 533mm 483mm

4

AND AND AND AND

1x26"/660mm 1x26"/660mm 1x28"/711mm 1x26"/660mm

SECTION 1 - DESCRIPTION

B. General specifications (per oven cavity)

PS310 PS314 PS360/360Q/360S PS360WB PS360EWB PS360WB70

Weight

Shipping Weight

Shipping Carton Vol.

1165 lbs./529kg 1165 lbs./529kg 1285 lbs./583kg 1485 lbs./674kg 1620 lbs./733kg 1825 lbs./829kg
1241 lbs./563kg 1241 lbs./563kg 1360 lbs./617kg 1560 lbs./708kg 1695 lbs./767kg 1900 lbs./863kg

105 ft.3/2.98m

3

105 ft.3/2.98m

3

106 ft.3/3.00m

3

129 ft.3/3.65m

3

129 ft.3/3.65m

3

164 ft.3/4.65m

3

Rated Heat Input

Gas

135,000 BTU 135,000 BTU 135,000 BTU 170,000 BTU 175,000 BTU 175,000 BTU

34,020kcal,40kw/hr. 34,020kcal,40kw/hr. 34,020kcal, 40kw/hr. 42,840kcal, 50kw/hr. 44,100kcal, 52kw/hr. 44,100kcal, 52kw/hr.

Electric

26kw/hr. 26kw/hr. 26kw/hr. -- -- --

Max. Operating Temp. < - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 550°F/288°C - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >

Air Blowers

Air Jet Velocity (avg.)

Warmup Time

< - - - - - - - - - - - - - - - - 2 blowers at 1550 ft.3 (43.9m3)/min. at 1700 RPM, 0.88"/2.2cm water static pressure - - - - - - - - - - - - - - - >
< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2600 ft./min. (1320cm/sec.) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >
< - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15 minutes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >

C. Gas orifice and pressure specifications - for gas-fired ovens (per oven cavity)

Natural Gas

PS310 PS314 PS360/360Q/360S PS360WB PS360EWB PS360WB70 Orifice I.D. Orifice I.D.

Main Orifice I.D.

0.219 0.219 0.219 0.250 0.250 0.250 0.028 0.065/#53 drill 6-12" W.C. 3-1/2" W.C.

5.56mm 5.56mm 5.56mm 6.35mm 6.35mm 6.35mm 0.71mm 1.65mm 14.9-29.9mbar 8.7mbar

Pilot Bypass Supply (inlet) Manifold

*

pressure pressure

ENGLISH

Propane

0.134" 0.134" 0.134" 0.152" 0.165" 0.165" 0.018" 0.034"/#62 drill 11-14" W.C. 10" W.C.

3.40mm 3.40mm 3.40mm 3.86mm 4.19mm 4.19mm 0.46mm 0.86mm 27.4-34.9mbar 24.9mbar

* NOTE: The PS360EWB gas oven does not use a bypass orifice.

D. Electrical specifications - for gas-fired ovens (per oven cavity)

Main Blower Control Current

Voltage Circuit Voltage Phase Freq. Draw Poles Wires

PS310/314/360/360Q/
360S/360WB

208-240V 120V 1 Ph 60 H z 10A 3 Pole 4 Wire (2 hot, 1 neut, 1 gnd)
208-240V (export) 120V (transformer) 1 Ph 50/60 Hz 10A 2 Pole 3 Wire (2 hot, 1 gnd)
200-220V (export) 120V (transformer) 1 Ph 50/60 Hz 10A 2 Pole 3 Wire (2 hot, 1 gnd)

PS360EWB/WB70

208-240V 120V conveyor speed 1 Ph 60 Hz 12A 2 Pole 3 wire (2 hot, 1 gnd)

controller (transformer);

all other control cicuits

as per line (208-240V)

E. Electrical specifications - for electrically-heated ovens (per oven cavity)

Main Blower Control Current kW

Voltage Circuit Voltage Phase Freq. Draw Rating Poles Wires

208-240V 120V 3 Ph 60 H z 67.3A at 208V 26.0 kW at 208V 4 Pole 5 Wire (3 hot, 1 neut, 1 gnd)

(with 3 Ph blower motors) 58.4A at 240V 26.0 kW at 240V

208-240V 120V 3 Ph 60 H z 67.3A at 208V 26.0 kW at 208V 4 Pole 5 Wire (3 hot, 1 neut, 1 gnd)

(with 1 Ph blower motors) 58.4A at 240V 26.0 kW at 240V

200-220V (export) 120V (transfomer) 3 P h 50/60 Hz 67.3A at 208V 24.3 kW at 208V 3 Pole 4 Wire (3 hot, 1 gnd)

53.5A at 220V 20.4 kW at 220V

240V (export) 120V (transformer) 3 Ph 50/60 Hz 58.4A 26.0 kW 3 Pole 4 Wire (3 hot, 1 gnd)

380V (export) 120V (transformer) 3 Ph 50/60 Hz 36.8A 24.3 kW 3 Pole 4 Wire (3 hot, 1 gnd)

400-416V (export) 120V (transfomer) 3 P h 50/60 Hz 33.8A 24.3 kW 3 Pole 4 Wire (3 hot, 1 gnd)

480V 120V (transformer) 3 P h 60 Hz 29.2A 26.0 kW 3 Pole 4 Wire (3 hot, 1 gnd)

IMPORTANT

Additional electrical information is provided on the oven's serial plate, and on the wiring diagram inside the machinery
compartment.

5

ENGLISH

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

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.
 Test for proper combustion and gas supply.
 Check that the ventilation system 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, refer to the following documents:

PS360 Pre-Installation Procedures Manual (Middleby Marshall P/N 88210-0024)

PS360 Installation Manual (Middleby Marshall P/N 88210-0025)

Or, contact your local Authorized Service Agent.

NOTE

There must be adequate clearance between the oven and combustible construction. Clearance

must also be provided for servicing and for proper operation.

NOTE

An electrical wiring diagram for the oven is located inside the machinery compartment or control

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 U.S.A., the oven installation must conform with local codes, or in the absence of local codes, with the

National Fuel Gas Code, ANSI Z223.1. The oven, when installed, must be electrically grounded in accor-

dance with local codes, or in the absence of local codes, with the National Electrical Code (NEC), or ANSI/

NFPA70.

NOTE

In Canada, the oven installation must conform with local codes, or in the absence of local codes, with the
Natural Gas Installation Code, CAN/CGA-B149.1, or the Propane Gas Installation Code, CAN/CGA-B149.2,
as applicable. The oven, when installed, must be electrically grounded in accordance with local codes, or in

the absence of local codes, with the Canadian Electrical Code CSA, C22.2, as applicable.

NOTE

For Australian installation, the oven installation must conform with AGA Code, AG601, and with any require-

ments of the appropriate statutory authority.

6

I. INSTALLATION KIT

1

3

2

SECTION 2 - INSTALLATION

Fig. 2-1 - Installation Kit

5

4

6

7

8

11

10

9

12

A. Installation kit components (one kit required per cavity)

Item Description Part Number Lower Oven w/o Top Lower Oven w/Top Upper Oven

1 Legs, adjustable 22450-0028 4 4 -­2* Caster, Swivel (with stud) 37115-0102 4* 4* 4*
3a Conveyor End Stop - PS310/314 35000-1099 1 1 1
3b Conveyor End Stop - PS360/360S

 Single Belt 35000-1103 1 1 1

 Split Belt 35509222
3c Conveyor End Stop - PS360Q 37000-0524 1 1 1
3c Conveyor End Stop - PS360WB/WB70 (Single or Split Belt) 36526111
3d Conveyor End Stop - PS360EWB

 Single Belt 35900-0370 2 2 2

 Split Belt: 2x21"/533mm belts 35900-0370 2 2 2

 Split Belt: 1x14"/356mm belt + 35509111

1x28"/711mm belt 35000-1099 1 1 1
4 Attachment Plate, upper oven 35122-0049 -- -- 2
5 Thermocouple 33812-1 2 2 2
6 Screw, #10-32 x 3/8" 21256-0008 2 2 2
7 Cable Clamp 27276-0001 1 1 1
8 Screw, #2PT 10-16 x 3/4" HWH 21292-0001 2 2 14
9 Owner's Operating and Installation Manual 41823111

10 Authorized Service Agency Listing 1002040 1 1 1

ENGLISH

NOTE

* The 4 swivel casters (Item 2) are pre-attached to each oven cavity for ease of movement during installation.

B. Additional installation kit components for gas ovens

Item Description Part Number Lower Oven w/o Top Lower Oven w/Top Upper Oven

6 Screw, #10-32 x 3/8" 21256-0008 1 1 1
8 Screw, #2PT 10-16 x 3/4" HWH 21292-0001 2 2 2

11 Gas hose, flexible 22361-0001 1 1 1
12a Flue vent, 14" (356mm) 30773 -- 1 - ­12b Flue vent, 29-1/2" (749mm) 30759 -- -- 1
12c Flue vent, 50" (1270mm) 30758 1 -- - -

C. Additional installation kit components for tandem ovens (not shown)

Item Description Part Number Tandem Oven Double (2-stack) Tandem Oven

--

-- Front Gasket Spacer 35000-1456 2 4

-- Rear Gasket Spacer 35000-1457 2 4

--

--

Machinery Compartment Trim Strip

Baking Chamber Gasket and Frame - PS360
Baking Chamber Gasket and Frame - PS360WB

35000-1454 1 2

37200-0013 1 2

32483 1 2

7

SECTION 2 - INSTALLATION

II. VENTILATION SYSTEM

IMPORTANT

ENGLISH

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

A. Requirements

CAUTION

 A mechanically driven ventilation system is

gas oven installations.

 A mechanically driven ventilation system is STRONGLY

RECOMMENDED for electric oven installations.

PROPER VENTILATION OF THE OVEN IS THE
RESPONSIBILITY OF THE OWNER.

REQUIRED for

B. Recommendations

NOTE THAT THE HOOD DIMENSIONS SHOWN IN FIGURE 2­2 ARE RECOMMENDATIONS ONLY. LOCAL AND NATIONAL
CODES MUST BE FOLLOWED WHEN INSTALLING THE
VENTILATION SYSTEM. ANY APPLICABLE LOCAL AND
NATIONAL CODES SUPERSEDE THE RECOMMENDATIONS
SHOWN IN THIS MANUAL.

The rate of air flow exhausted through the ventilation system may
vary depending on the oven configuration and hood design.
Consult the hood manufacturer or ventilation engineer for these
specifications.

To avoid a negative pressure condition in the kitchen area, return
air must be brought back to replenish the air that was exhausted.
A negative pressure in the kitchen can cause heat- related
problems to the oven components as if there were no ventilation
at all. The best method of supplying return air is through the
heating, ventilation and air conditioning (HVAC) system. Through
the HVAC system, the air can be temperature-controlled for
summer and winter. Return air can also be brought in directly
from outside the building, but detrimental effects can result from
extreme seasonal hot and cold temperatures from the outdoors.

NOTE: Return air from the mechanically driven system must not
blow at the opening of the baking chamber. Poor oven baking
performance will result.

C. Other ventilation concerns

 Special locations, conditions, or problems may require the

services of a ventilation engineer or specialist.
 Inadequate ventilation can inhibit oven performance.
 It is recommended that the ventilation system and duct work

be checked at prevailing intervals as specified by the hood

manufacturer and/or HVAC engineer or specialist.

18"

458mm

Fig. 2-2 - Ventilation System

2"/51mm
minimum

18"

458mm

8

12"

305mm

3"

76mm

III. ASSEMBLY

A. Stacking

If the installation will include upper ovens mounted atop lower
ovens:

1. Remove the casters (pre-attached to each oven cavity) from
the upper ovens.

2. Stack the oven cavities. If necessary, refer to the Installation
Manual for Model PS310/360 Ovens (Middleby P/N 88210-

0025).

SECTION 2 - INSTALLATION

Figure 2-3 - Exploded View, Oven Stand

Attachment

plates inc. w/

upper oven

installation kit

B. Stands

If the installation includes ovens that are to be mounted on
stands:

 Remove the casters (pre-attached to each oven cavity) and

install them on the stands as shown in Figure 2-3.

 Assemble the ovens to the stands. An exploded view of the

stand is shown in Figure 2-3.

C. Flue Vent(s)

For gas ovens, attach one flue vent to the rear wall of each oven
cavity. Use one #10-16 x 3/8" and two #10-32 x 3/4" screws for
each flue vent. These screws are provided in the Installation Kit.

IV. THERMOCOUPLE INSTALLATION

1. Install one thermocouple sensing bulb into each of the two
holes in the rear panel of the oven, as shown in Figure 2-4.
Fasten each thermocouple in place using one of the #10­32 x 3/8" screws supplied in the Installation Kit.

2. Thread BOTH sets of thermocouple leads through the
grommet and into the machinery compartment, as shown
in Figure 2-4.

3. Remove the right-side access panel of the machinery
compartment.

4. Thread the thermocouple leads through the side of the
machinery compartment as shown in Figure 2-5, and into
the electrical box (at the right-front of the machinery compart­ment).

ENGLISH

Casters inc.

w/oven

Figure 2-4 - Thermocouple Installation Locations

Thermocouples

Grommet-protected hole

Figure 2-5 - Placing the Thermocouple Leads

5. Connect BOTH sets of thermocouple leads to the tempera­ture controller as shown in Figure 2-6. Note that the two
thermocouples are now tied together at the temperature
controller.

6. Replace the right-side panel of the machinery compart­ment.

7. Repeat Steps 1-6 for any other oven cavities in the installa­tion.

8=White=Positive

7=Red=Negative

R=No Connection

Ground=Shielded cable

Figure 2-6 - Thermocouple Lead Connections

9

SECTION 2 - INSTALLATION

V. TANDEM OVEN ASSEMBLY

NOTE

For non-tandem oven installations, skip ahead to Section VI,
Conveyor Installation.

ENGLISH

1. Determine the proper position of the ovens by referring to
Figure 2-7. Then, move the ovens to their approximate final
locations.

2. Check that the top and bottom air finger retaining screws are
present on all mating ends of the oven sections. See Figure
2-7. The screws prevent the air fingers from sliding in
between the oven sections.

3. Remove the rear axial cooling fans that are adjacent to the
mating sides of the ovens. The fans may either be completely
disconnected, or left attached by their wiring as shown in
Figure 2-8.

Figure 2-7

Oven Positioning and Alignment

LEFT OVEN

Sealing gasket

assembly

(pre-mounted)

Alignment

plate

Slot for

alignment

plate

Air finger

NOTE: The Sealing Gasket Assembly may

be pre-mounted to EITHER of the oven

cavities.

Figure 2-8 - Cooling Fan Removal

Mating surface of

ovens (shown

from lower rear)

RIGHT OVEN

retaining

screws

10

Wiring is still

connected

4. Insert three of the supplied 1/2 x 5 bolts through the holes
in the frame of the right oven, pointing outward as shown in
Figure 2-9. Then, slide the spacers into place on the bolts.

SECTION 2 - INSTALLATION

Figure 2-9 - Bolts and Spacers

2-1/2" x 2-1/2"

(64x64mm)

spacers

ENGLISH

2-1/2" x 8"

(64x203mm)

spacers

5. Push the ovens together. Check that the mounting bolts,
alignment plate, and sealing gasket are all properly aligned.
See Figure 2-10.

6. Tighten all of the attaching bolts. Check that the mating
edges of the ovens align properly. If gaps appear between
the tops of the ovens, it will be necessary to loosen the
connecting bolts and realign the ovens.

7. Attach the front trim strip between the two ovens, as shown
in Figure 2-11.

8. Replace the rear axial cooling fans. See Figure 2-8.

Figure 2-10 - Aligning the Sections

Figure 2-11 - Trim Strip Installation

11

Trim strip

SECTION 2 - INSTALLATION

VI. CONVEYOR INSTALLATION

Refer to either Step A or Step B in this section, as appropriate,
to install the conveyor and belt.

A. Installing the Conveyor - All ovens EXCEPT Tandem models

ENGLISH

NOTE

Split belt conveyors can only be installed from the end of the oven
with the drive motor.

Single-belt conveyor assemblies may be inserted into either
end of the oven. If it is to be installed from the end of the oven
without the drive motor, the drive sprocket assembly must be
removed.

To remove the drive sprocket (if necessary), loosen the set screw
on the conveyor collar as shown in Figure 2-12. Then, pull the
sprocket assembly straight out.

1. Lift the conveyor and position it in the oven as shown in
Figure 2-13.

Figure 2-13 - Inserting the Conveyor

Figure 2-12 - Removing the Conveyor Drive Sprocket

Loosen conveyor collar

set screw, then pull shaft

straight out

1

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 plug, as
shown in Figure 2-14.

NOTE:

PS360EWB ovens have a retainer bracket that extends the
full width of the conveyor frame on
All other ovens have retainer clips as shown in Figure 2-14,
located on the drive (left) side of the frame only.

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. The
drive motor and sprocket are shown in Figure 2-12.

7. Install the conveyor drive motor cover and tighten its hanger
screw (on the rear wall of the oven).

8. Check the tension of the conveyor belt as shown in Figure
2-15. 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 2-15.

both ends of the frame.

2 3

Figure 2-14 - Conveyor retainers

Retainers on both ends of

PS360EWB, drive side

only for all other ovens

Figure 2-15 - Checking the conveyor tension

3-4"

(75-100mm)

vertical

deflection

Conveyor

tension

adjustment

screws (idler

end only)

12

B. Installing the Conveyor and Belt - Tandem oven models

NOTE

For non-tandem oven installations, skip ahead to Section VII,
Final Assembly.

1. Insert the conveyor frame into the oven as follows:
Slide one hinged conveyor frame section into each end of

the oven. The two sections butt against each other at the gap
between the two oven sections. See Figure 2-17.

IMPORTANT

Be sure that the drive section of the conveyor frame is at the
same end of the oven as the conveyor drive motor.

2. Slide the conveyor belt through the support rods underneath
the frame, and thread it through the oven. Then, reach
through the oven window and pull the free end of the belt
through the oven so that it lies atop the conveyor frame.

After the belt has been pulled through the oven, check the
following:
 The conveyor belt links must be oriented as shown in

Figure 2-18.

 The smooth side of the conveyor belt must face UP.

3. Connect the inside master links. Check that the links are
oriented as shown in Figure 2-18.

4. 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 2-19.

5. 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.

6. Check the tension of the conveyor belt as shown in Figure
2-15 (on the previous page). The belt should lift between 3­4" (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.

7. LOOSELY attach the conveyor drive motor to the end wall of
the oven. Refer to Figure 2-12 (for ovens with standard
conveyor frames) or Figure 2-20 (for ovens with heavy-duty
conveyor frames).

8. Assemble the conveyor drive chain in place on the motor and
conveyor drive sprockets.

9. Position the motor to adjust the deflection of the drive chain
to 3/4 (19mm). DO NOT OVERTIGHTEN THE DRIVE
CHAIN. Then, tighten the bolts to hold the motor in place.

SECTION 2 - INSTALLATION

Figure 2-17 - Tandem Conveyor Installation

Hinged

end section

Hinged

end section

Figure 2-18 - Conveyor and Inside Master Link Orientation

Direction
of travel

Figure 2-19 - Outside Master

Link Orientation

Direction
of travel

Figure 2-20 - Drive Motor for

Tandem Oven Heavy-Duty

Conveyor Frame

CORRECT
master link

position

Incorrect

master link

position

Figure 2-21 - Crumb tray positions

Upper Oven

(Drive End)

Upper Oven

(Idler End)

ENGLISH

VII. FINAL ASSEMBLY

1. Assemble the end plugs and motor housing onto the oven.
These components are shown in Figure 1-1 (on Page 1).

2. Slide the conveyor extensions over the ends of the conveyor
frame. Be sure that the extension with the drive sprocket
opening is placed on the drive end.

NOTE

The PS360EWB oven does not use conveyor extensions.

3. Refer to Figure 2-21 for the correct location of each crumb tray.
Then, install the crumb trays underneath the conveyor as
shown in Figure 2-22. First, place the inside edge of the tray
onto the bracket attached to the end plug. Then, swing the
outside edge of the tray up and into place.

4. Press the end stop down over the edge of the conveyor
extension at the exit end of the oven. See Figure 2-22.

5. After the oven is moved to its final location, adjust the bottom
section of the legs so that the oven is level and the casters
do not touch the floor.

Lower Oven

Figure 2-22 - Crumb trays, extensions, and end stop

End stop

Crumb tray

13

Conveyor extension Conveyor frame

SECTION 2 - INSTALLATION

VIII. ELECTRICAL SUPPLY (all ovens)

WARNING

Authorized supplier personnel normally accomplish
the connections for the ventilation system, electric supply,
and gas supply, as arranged by the customer. Following these

ENGLISH

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 2-23.

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 or control compartment of the oven. Electrical
specifications are also listed on the oven's serial plate (Figure
2-23) and in the Electrical Specifications table (on Page 5).

The oven requires a ground connection to the oven ground screw
located in the electrical junction box. (The box is shown in Figure
2-24.) If necessary, have the electrician supply the ground wire.

Do NOT use the wiring conduit or other piping for ground
connections!

Figure 2-23 - Oven Serial Plate

Serial plate location

CAUTION

Before connecting incoming power to the oven, measure the
voltage of each input leg to neutral. The expected voltage is
approximately 120V. ANY voltage reading exceeding 130V
indicates that the supply has a high leg. CONNECTING A
HIGH LEG TO THE OVEN VOIDS ALL OVEN WARRANTIES.
Connecting a high leg to the black lead of the oven can severely
damage the ovens electrical and electronic components.

CAUTION

DO NOT CONNECT BLACK WIRE TO HIGH LEG.

VOLTAGE OF THE BLACK AND WHITE WIRES MUST

BE NO HIGHER THAN 130 VAC.

A. Additional Information - Electric Ovens

For electric ovens, a 1-1/4" (32mm) dia. cutout in the back
wall of the machinery compartment provides access for the
electrical supply connections. Using flexible cables for the
electric power supply conductors requires a 1-1/4" (32mm)
strain-relief fitting (not furnished with the oven) to enable
safe access to the terminal block from which power is
distributed to the oven.

B. Additional Information - Gas Ovens

All gas oven electric supply connections are made via the
electrical junction box on the rear of the oven, shown in
Figure 2-24. The power lines then connect to the oven
circuits through the Machinery Compartment Access Panel
Safety Switch. This switch interrupts electric power to the
oven when the Machinery Compartment Access Panel is
opened.

C. Additional Information - Ovens with External Transform-

ers (export versions)

Position the transformer on the rear wall of the oven, on the
same side as the control compartment, as space permits.
Fasten it in place using the supplied mounting hardware.

D. Connection

Refer to the wiring diagram inside the machinery
compartment or control compartment of the oven to
determine the correct connections for the electrical supply
lines. Connect the supply as indicated on the wiring
diagram. Be sure to connect the electrical supply ground
wire to the oven ground screw located in the junction box
on the rear of the oven.

Figure 2-24 - Utility Connection Locations

Gas oven:

3/4" (19mm) pipe for

gas utility connection

Electric oven:

1-1/2" (38mm) conduit for

electric utility connection

NOTE: The location of these
components may vary slightly

depending on the oven model.

Electrical

Junction Box

14

Appliance

Connection/Male

Nipple

Figure 2-25 - Flexible Gas

Hose Installation

To Gas

Supply Pipe

90°

Elbow

Full-Flow Gas

Shutoff Valve

Flexible

Gas Hose

IX. GAS SUPPLY (gas ovens only)

SECTION 2 - INSTALLATION

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).

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" (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 ovens gas supply requirements before making the
gas utility connection. Gas supply requirements are listed on the
ovens serial plate (Figure 2-23) and in the Gas Orifice and
Pressure Specifications table (Page 5 of this manual).

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 2-25; 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
2-26.

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.

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 complies
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.

WARNING

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.

ENGLISH

Inlet pressure tap

(where incoming
gas pressure is

measured)

Manual

shutoff valve

On/Off Knob

Always leave in

ON position

Combination Gas

Control Valve

(Safety Regulator)

Manifold pressure tap

(where manifold gas

pressure is measured)

High Flame

Solenoid Valve

Figure 2-26 - Gas Burner and Piping Assembly

Burner
Blower

Gas Burner

Pilot pressure tap

(where pilot gas

pressure is measured)

Low Flame

Bypass Line

15

Model PS360EWB Only

Modulating gas valve

NOTE: PS360EWB ovens use a

modulating gas valve INSTEAD OF

a high flame solenoid valve and

low-flame bypass line.

SECTION 3 - OPERATION

I. LOCATION AND DESCRIPTION OF CONTROLS

ENGLISH

All ovens except PS360EWB and PS360WB70 PS360EWB and PS360WB70 only

D.

Conveyor Speed

(or "

")

controller(s)

Fig. 3-1 - Control Panel

D.

Conveyor Speed

(or "

")

controller(s)

E.

Digital Temperature

")

(or "

controller

A.

"BLOWER"

(or "

switch

A.

B.

C.

B.

"HEAT"

(or "

")

")

switch

C.

"CONVEYOR"

(or "

")

switch

"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.

E.

Digital Temperature

")

(or "

controller

A.

"BLOWER"

")

(or "

switch

D.

Conveyor Speed Controller: Adjusts and dis-

B.

"HEAT"

(or " ")

switch

C.

"CONVEYOR"

(or "

")

switch

plays the bake time. Single-belt ovens have one
controller. Split belt ovens have one controller for
each conveyor belt, labeled "FRONT" and "BACK."
For tandem and double tandem ovens, this

"HEAT" Switch: Allows the gas burner to light.

control is present only on the left oven section(s).
Activation of the gas burner is determined by the
settings on the Digital Temperature Controller.

E.

"CONVEYOR" Switch: Turns the conveyor drive

motor on and off. For tandem and double tan­dem ovens, this switch is present only on the left

Digital Temperature Controller: Continuously

monitors the oven temperature. Settings on the

Digital Temperture Controller control the activa-

tion of the gas burner.

oven section(s).

NOT SHOWN:

F. 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.

16

II. NORMAL OPERATION - STEP-BY-STEP

A. DAILY STARTUP PROCEDURE

1. Check that the circuit breaker/fused disconnect is in the on
position. If the oven is equipped with a window, check that
the window is closed.

2. Turn the "BLOWER" (or )
switch to the ON (or "I")
position.

or

SECTION 3 - OPERATION

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 Tem­perature ( ) key to show

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.

wait

for

ENGLISH

3. Turn the "CONVEYOR" (or
) switch to the ON

(or "I") position.

4. If necessary, adjust the

conveyor speed setting
by turning the three
thumbwheels to change
the displayed bake time.

5. Adjust the temperature controller to a desired set tempera-

ture, 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.

+

or

or

mins secs

thumbwheels

wait

for

9. Allow the oven to preheat for 10 minutes after it has reached
the set point temperature.

B. DAILY SHUTDOWN PROCEDURE

1. Turn the "HEAT" (or
and "BLOWER" (or
switches to the "OFF" (or

"O") position. Note that
the blowers will remain in
operation until the oven
has cooled to below
200°F (93°C).

)
)

+

- - - - - or - - - - -

+

2. Make certain that there
are no products left on the
conveyor inside the oven.
Turn the "CONVEYOR" (or

) switch to the "OFF"

(or "O") position.

3. If the oven is equipped with a window, 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.

or

6. Turn the "HEAT" (or )
switch to the "ON" (or "I")
position, and wait for the
"HEAT ON" light to turn
on.

or

wait

for

IMPORTANT

On gas ovens, if the "HEAT ON" light will not illuminate, OR
if the oven does not heat, the gas burner may not have lit.
Turn the "HEAT" (
(

) switches to the "OFF" ("O") position. Wait for AT
LEAST FIVE MINUTES before restarting the oven. Then,
repeat the Daily Startup procedure.

), "BLOWER" ( ), and "CONVEYOR"

CAUTION

In case of power failure, turn all switches to the OFF (or "O")
position, open the oven window, and remove the product.
After the power has been restored, perform the normal
startup procedure.

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.

17

SECTION 3 - OPERATION

III. QUICK REFERENCE: DIGITAL TEMPERATURE CONTROLLER

ENGLISH

"HEAT ON" Light

Lights when the
burner is in opera­tion. Note that on all
ovens EXCEPT the
PS360EWB, this light
cycles on and off dur­ing normal operation.

"SP LOCK" Light

Lights when the set
point is locked out
from changes. This
setting can only be
changed by service
personnel.

Display

Shows the Set
Point or the Actual
Temperature in
degrees Fahren­heit (F) or Celsius
(C).

"SET PT" (setpoint)
Light

Lights when the set
point is shown in the
display.

OVERTEMP Light

Lights when the
oven temperature is
greater than 650°F
(343°C). Refer to
Quick Reference:
Troubleshooting in
this section.

Temperature Key

Press this key
once to view the
Actual Tempera­ture in the Display.

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

"ACTUAL TEMP"
Light

Lights when the
Actual Tempera­ture is shown in
the display.

Service Key

For use by service
personnel 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 seconds.

18

V. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM PROBLEM SOLUTION

SECTION 3 - OPERATION

light is lit, food product is

undercooked

Oven will not

turn on at all

Oven shuts down shortly

after it is turned on

appears in display,
oven is not heating

The oven temperature ex­ceeded 650°F (343°C), and
the burner was automati­cally shut down.

Electrical power may not be
reaching the oven, or the
controls may be set incor­rectly.

The gas burner did not light
within 90 seconds of turn­ing the "HEAT" (or
Switch to the ON (or "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.

 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" (or

(or )switches to the "OFF" (or "O") position.

)

 Wait for AT LEAST FIVE MINUTES before restarting the oven.
 Repeat the Daily Startup procedure.

 Turn the "HEAT" (or

(or )switches to the "OFF" (or "O") position.

 Wait for AT LEAST FIVE MINUTES before restarting the oven.
 Repeat the Daily Startup procedure.

(or ) Switch is in the ON (or "I")

), "BLOWER" (or ), and "CONVEYOR"

), "BLOWER" (or ), and "CONVEYOR"

ENGLISH

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" (or ) and "HEAT" (or )

Switches are in the ON (or "I") position.

 If the oven still will not heat, turn the "HEAT" (or ) , "BLOWER"

(or ), and "CONVEYOR" (or )switches to the "OFF" (or "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

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.

19

SECTION 4 - MAINTENANCE

ENGLISH

Before ANY cleaning or servicing of the oven, perform the following procedure:

1. Switch off the oven and allow it to cool. Do NOT service the oven while it is warm.

2. Turn off the electric supply circuit breaker(s) and disconnect the electric supply to the oven.

3. If it is necessary to move the oven for cleaning or servicing, disconnect the gas supply connection before moving
the oven.

When all cleaning and servicing is complete:

1. If the oven was moved for servicing, return the oven to its original location. Adjust the legs so that they are seated
properly on the floor.

2. Reconnect the gas supply.

3. Reconnect the electrical supply.

4. Turn on the full-flow gas safety valve. Test the gas line connections for leaks using approved leak test substances
or thick soap suds.

5. Turn on the electric supply circuit breaker(s).

6. Perform the normal startup procedure.

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.

WARNING

WARNING

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.

NOTE

It is 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.

20

I. MAINTENANCE - DAILY

A. Check that the oven is cool and the power is disconnected,

as described in the warning on Page 20.

B. Clean the outside of the oven with a soft cloth and mild

detergent.

C. Clean ALL of the cooling fan grills and vent openings with a

stiff nylon brush. Refer to Figures 4-1, 4-2, and 4-3 for the
locations of the grills and vents.

D. Check that ALL cooling fans are operating properly.

CAUTION

If a cooling fan is not operating correctly, it must be replaced
IMMEDIATELY. Operating the oven without adequate cool­ing can seriously damage the oven's internal 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 the
drawings on Page 10 in the

Installation section.

SECTION 4 - MAINTENANCE

Figure 4-1 - Cooling Fan/Vent Locations:

All ovens except PS360EWB and PS360WB70

Vents in top rear

edge of upper

oven

FRONT

Vents in floor

of lower oven

2 rear fans,

upper and lower ovens

REAR

Figure 4-2 - Cooling Fan/Vent Locations: PS360EWB

2 front fans,

upper and lower ovens

Vents on each side of

rear panel, upper and

lower ovens

Vents in top rear

edge of upper

ENGLISH

oven

G. OVENS EQUIPPED WITH WINDOWS ONLY: Clean the

window in place.

FRONT

Vents on each side

of floor panel of

lower oven

REAR

Figure 4-3 - Cooling Fan/Vent Locations: PS360WB70

2 front fans,

upper and

lower ovens

2 side vents,

upper and lower ovens

21

FRONT

REAR

SECTION 4 - MAINTENANCE

II. MAINTENANCE - MONTHLY

NOTE

When removing the conveyor, refer to the drawings on Pages 12­13 in the Installation section.

ENGLISH

A. Check that the oven is cool and the power is disconnected,

as described in the warning on Page 20.

B. Remove the drive motor shroud and conveyor extension

covers from the oven. Disconnect the drive chain from the
sprocket on the drive shaft of the conveyor.

C. Slide the conveyor out of the oven.

NOTE

Split belt conveyors can only be removed from the end of the
oven with the drive motor.

Single-belt conveyor assemblies may be removed from
either end of the oven. If it is to be removed from the end of
the oven without the drive motor, 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 2-12 (on
Page 12). Then, pull the sprocket assembly straight out.

D. Remove the end plugs from the oven. The end plugs are

shown in Figure 1-1, on Page 4 of this Manual.

E. Slide the air fingers and blank plates out of the oven, as

shown in Figure 4-4. 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

F. Disassemble the air fingers as shown in Figure 4-5. 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.

G. 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 on Page 20 for cleaning
precautions.

H. Reassemble the air fingers. Then, replace them in the oven,

using the "location code" as a guide.

I. Replace the end plugs on the oven.

J. Reassemble the conveyor into the oven. If the drive sprocket

was removed when installing the conveyor, replace it at this
time.

K. Reattach the drive chain.

L. Check the tension of the conveyor belt as shown in Figure

2-15 (on Page 12). The belt should lift between 3-4" (75­100mm). 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.

M. Replace the drive motor shroud and the conveyor exten-

sions.

22

Figure 4-4 - Removing Air Fingers and Plates

Blank Plate

Air Finger

Figure 4-5 - Disassembling the Air Fingers

Manifold

Inner plate

Outer Plate

2

Pull outer plate

straight up

and off

Swing ends of inner plate and

manifold apart

4

Pull inner plate

upwards, and

then away from

manifold

1

Step on lip of manifold

3