Middleby Marshall Oven PS528G User Manual

PS528-Series Gas Ovens: English

A MIDDLEBY COMPANY

owner's

operating

& installation

manual

PS528-Series OVENS

Model PS528G

PS528 (Single)

PS528 (Triple)

PS528 (Double)

Part No. 63935 Rev. C

Price $30.00

P: 04/12

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Model No.

Modéle No.

Serial No.

Serié No.

Installation Date

Date d'installation

MIDDLEBY MARSHALL

No Quibble limited WarraNty

(U.S.A. Only)

MIDDLEBY MARSHALL INC.

OVEN LIMITED WARRANTY

(Non U.S.A.)

The Seller warrants equipment manufactured by it to be free from

defects in material and workmanship for which it is responsible. The

Seller’sobligationunderthiswarrantyshallbelimitedtoreplacingor

repairing, at Seller’s option, without charge, F.O.B. Seller’s factory,

any part found to be defective and any labor and material expense

incurred by Seller in repairing or replacing such part. Such warranty

is limited to a period of one year from date of original installation or

15 months from date of shipment from Seller’s factory, whichever

is earlier, provided that terms of payment have been fully met. All

labor shall be performed during regular working hours. Overtime

premium will be charged to the Buyer.

MIDDLEBY MARSHALL, HEREINAFTER REFERRED

TO AS “THE SELLER”, WARRANTS EQUIPMENT

MANUFACTURED BY IT TO BE FREE FROM DEFECTS

IN MATERIAL AND WORKMANSHIP FOR WHICH IT IS

RESPONSIBLE. THE SELLER’S OBLIGATION UNDER

THIS WARRANTY SHALL BE LIMITED TO REPLACING

OR REPAIRING, AT SELLER’S OPTION, WITHOUT

CHARGE, ANY PART FOUND TO BE DEFECTIVE AND

ANY LABOR AND MATERIAL EXPENSE INCURRED BY

SELLER IN REPAIRING OR REPLACING SUCH PART.

SUCH WARRANTY SHALL BE LIMITED TO THE ORIGINAL

PURCHASER ONLY AND SHALL BE EFFECTIVE FOR

A PERIOD OF ONE YEAR FROM DATE OF ORIGINAL

INSTALLATION, OR 18 MONTHS FROM DATE OF

PURCHASE, WHICHEVER IS EARLIER, PROVIDED THAT

TERMS OF PAYMENT HAVE BEEN FULLY MET.

This warranty is not valid unless equipment is installed,

started, and demonstrated under the supervision of a factory-

authorized installer.

Normal maintenance functions, including lubrication, adjustment of

airﬂow,thermostats,doormechanisms,microswitches,burnersand

pilot burners, and replacement of light bulbs, fuses and indicating

lights, are not covered by warranty.

This warranty is valid only if the equipment is installed,

started, and demonstrated under the supervision of a factory-

authorized installer.

Anyrepairsorreplacementsofdefectivepartsshallbeperformedby

Seller’sauthorizedservicepersonnel.Sellershallnotberesponsible

for any costs incurred if the work is performed by other than Seller’s

authorized service personnel.

Normal maintenance functions, including lubrication,

cleaning, or customer abuse, are not covered by this no

quibble warranty.

When returning any part under warranty, the part must be intact and

complete, without evidence of misuse or abuse, freight prepaid.

Seller shall be responsible only for repairs or replacements

of defective parts performed by Seller’s authorized service

personnel. Authorized service agencies are located in

principal cities throughout the contiguous United States,

Alaska, and Hawaii. This warranty is valid in the 50 United

States and is void elsewhere unless the product is purchased

through Middleby International with warranty included.

Seller shall not be liable for consequential damages of any kind

which occur during the course of installation of equipment, or which

result from the use or misuse by Buyer, its employees or others of

the equipment supplied hereunder, and Buyer’s sole and exclusive

remedy against Seller for any breach of the foregoing warranty or

otherwise shall be for the repair or replacement of the equipment

or parts thereof affected by such breach.

The foregoing warranty is exclusive and in lieu of all

other warranties, expressed or implied. There are no

implied warranties of merchantability or of ﬁtness for a

particular purpose.

The foregoing warranty shall be valid and binding upon Seller if and

only if Buyer loads, operates and maintains the equipment supplied

hereunder in accordance with the instruction manual provided to

Buyer. Seller does not guarantee the process of manufacture by

Buyer or the quality of product to be produced by the equipment

supplied hereunder and Seller shall not be liable for any prospective

or lost proﬁts of Buyer.

The foregoing shall be Seller’s sole and exclusive obligation

and Buyer’s sole and exclusive remedy for any action,

including breach of contract or negligence. In no event shall

Seller be liable for a sum in excess of the purchase price of

the item. Seller shall not be liable for any prospective or lost

proﬁts of Buyer.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU

OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES

WHATSOEVER. SPECIFICALLY THERE ARE NO IMPLIED

WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR

A PARTICULAR PURPOSE.

This warranty is effective on Middleby Marshall

equipment sold on, or after, February 15, 1995.

The foregoing shall be Seller’s sole and exclusive obligation and

Buyer’ssoleandexclusiveremedyforanyaction, whetherinbreach

of contract or negligence. In no event shall seller be liable for a sum

in excess of the purchase price of the item.

The Middleby Marshall logo is a registered trademark of Middleby Marshall, A Middleby Company.

Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A. • (847) 741-3300 • FAX: (847) 741 4406

iii

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TABLE OF CONTENTS

(Continued)

Page

SECTION 1

I. MODEL IDENTIFICATION ..............................................1

SERIES PS528 GAS SPECIFICATIONS.............................2

II. COMPONENT FUNCTION .............................................4

A. Conveyor Motor and Conveyor Belt ........................4

B. Blower Fan .................................................................4

C. Gas Burner .................................................................4

D. Cooling Fan ................................................................4

E. Air Fingers and Blank Plates - See Figure 1-9 ........4

SECTION 2

III. STEP-BY-STEP OPERATION ........................................22

A. Startup Procedures ..................................................22

Daily Startup..................................................................22

Power Failure.................................................................22

B. Shutdown Procedure ..............................................22

IV. NORMAL OPERATION - STEP-BY-STEP................... 24

A.Daily Startup Procedure............................................ 24

B. Daily Shutdown Procedure ..................................... 24

V. QUICK REFERENCE: TROUBLESHOOTING............ 26

SECTION 4 MAINTENANCE

I. UNLOADING ....................................................................8

PARTS LIST FOR SERIES PS528 GAS OVEN

I. MAINTENANCE - DAILY............................................. 28

A. Exterior...................................................................... 28

B. Cooling Fan............................................................... 28

C. Conveyor Belt ........................................................ 28

D. Crumb Pans ............................................................ 28

II. MAINTENANCE - MONTHLY ...................................... 29

A. Removing Conveyor From Oven For Cleaning .... 29

B. Air Fingers Disassembly For Cleaning.................. 31

C. Reassembly of Air Fingers ..................................... 32

D. Reinstall End Plugs ................................................. 35

E. Conveyor Reassembly Into Oven........................... 36

F. Checking Conveyor Belt Tension........................... 36

G. Conveyor Belt Link Removal.................................. 37

H. Attaching Drive Chain ............................................. 38

III. MAINTENANCE - EVERY 3 MONTHS ......................... 39

A. Electrical Terminals................................................. 39

B. Ventilation ................................................................ 39

IV. MAINTENANCE - EVERY 6 MONTHS......................... 39

PS528-SERIES GAS OVEN KEY SPARE

INSTALLATION KIT .....................................................8

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS528-SERIES OVENS .....................................13

CIRCUIT BREAKER.......................................................13

ELECTRICAL SPECIFICATIONS ..................................13

ELECTRICAL RATING...................................................13

SUPPLY WIRE ...............................................................13

SUGGESTED..................................................................13

II. VENTILATION GUIDELINES.........................................13

III. ELECTRICAL CONNECTION INFORMATION FOR

PS528-SERIES OVENS..............................................14

IV. ELECTRIC SUPPLY FOR GAS HEATED OVENS ......14

V. GAS SUPPLY ...............................................................15

SECTION 3 INSTALLATION

I. CONTROL FUNCTIONS.................................................19

II. COMPONENT INFORMATION AND LOCATION ........20

A. Door Safety Switch ..................................................20

B. Blower Switch ..........................................................20

C. Heat Switch ..............................................................20

D. Temperature Controller............................................20

E. Conveyor .................................................................21

MEASURING CONVEYOR SPEED. ..............................21

PARTS ...................................................................... 40

KEY SPARE PARTS KIT ............................................... 40

SECTION 5 TROUBLESHOOTING

Troubleshooting Charts...................................................... 41

SECTION 6 ELECTRICAL SCHEMATICS

Wiring Diagram, G208-240V 50/60 GO, PS528 ............... 43

NOTE

Wiring Diagrams are in Section 6 of this Manual.

The diagram for each oven is also on the lower

inner surface of its Control Console.

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SECTION 1

DESCRIPTION

SECTION 1

DESCRIPTION

I. MODEL IDENTIFICATION

The Middleby Marshall PS528-Series may be used

either as a single oven or stacked for use as double or

triple ovens.

AsinglePS528-SeriesOven(Figure1-1)ismountedona

base pad with legs. A double oven (Figure 1-2) consists

of two, stacked, single ovens. A triple oven (Figure 1-3)

consists of three stacked single ovens. The lower oven

is mounted on a base pad with stacking pins.

On a double or triple oven, the ovens operate indepen-

dently. All ovens use identical controls and components.

One oven can be cleaned or serviced, while the others

are operating.

Figure 1-1. Single PS528 Oven

Figure 1-2. Double PS528 Oven

Figure 1-3. Triple PS528 Oven

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SECTION 1

DESCRIPTION

PS528 SERIES OVEN SPECIFICATIONS

Conveyor Belt Width

Heating Zone Length

Baking Area Square Feet

18.00" (457mm)

28.00" (711mm)

3.5 sq. ft. (0.33 sq. m.)

Overall Dimension

Standard Single Oven w/Legs

50.00" (1270mm) L ×

40.75" (1035mm) W ×

21.72" (786mm) H ×

Overall Dimension

Double Oven

50.00" (1270mm) L ×

40.75" (1035mm) W ×

37.27" (947mm) H x

Overall Dimension

Triple Oven

50.00" (1270mm) L x

40.75" (1035mm) W ×

52.82" (1342mm) H ×

Weight of Single Oven

250 lb (93.3kg)

Shipping Weight

Shipping Cube

325 lb (121.3kg)

22.1 ft³(0.62 m³)

BTU's - Natural or Propane Gas

Gas Input - Natural or Propane Gas

Maximum Operating Temperature

50,000 BTU/hr (53 MJ/hr)

1/2" NPT (1/2" BS)

600°F (316°C)

Warm-up Time

Belt Speed Limits

20 min.

1-10 minutes

SERIES PS528 ELECTRICAL SPECIFICATIONS

Main Blower &

Control Circuit

Phase

Frequency

Amperage

Poles

Wires

Elements Voltage

Voltage

Draw

208-240V

1 Ph

50/60 Hz

1.5 Amp

2 Pole

3 Wire

(2 hot, 1 grd)

GAS ORIFICE AND PRESSURE SPECIFICATIONS (PER OVEN CAVITY) - DOMESTIC AND STANDARD EXPORT OVENS

Oriﬁce (Manifold)

Gas Type

Natural

Main Oriﬁce I.D.

Supply (Inlet) Pressure

Pressure

#42 drill (.094")(2.38mm)

#48 drill (.076")(1.93mm)

6-8” W.C. (14.9-19.9mbar) * (1.49-3 KPA) 3.5” W.C. (8.72mbar) (0.872 KPA)

Propane

* The gas supply pressures and oriﬁce sizes shown are for ovens installed in North America. The required gas supply pressures and oriﬁce sizes

of ovens installed in other locations are dependent on the local gas type and on all applicable local codes.

GAS ORIFICE AND PRESSURE SPECIFICATIONS (PER OVEN CAVITY) - CE OVENS

Supply (Inlet) Pressure

IT,PT,ES,SE,

Main

Oriﬁce

dia.

UK,CH,IT,AT,

DK,FI

I_2H

SE,CH,AT,DK, BE,IE,IT,PT,

Oriﬁce

(Manifold)

Pressure

Rated

Heat

Input

Gas

Type

I_2E

BE,FR

I_2E+

FI,DE,NL

I_3B/P

ES,UK

I₃₊

G20

G25

G30

2.3749

mbar

11.21

mbar

22.36

kW-hr.

2.3749

16.19

mbar

22.36

kW-hr.

1.3970

29 or 50

mbar

28-30, 37

or 50 mbar

26.2

mbar

22.59

kW-hr.

NOTE

Wiring Diagrams are contained in Section 6 of this Manual

and are also located inside the oven at the

bottom of the Control Panel.

Additional electrical information is provided on the oven's serial plate.

This Manual Must Be Kept For Future Reference.

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SECTION 1

DESCRIPTION

II. COMPONENT FUNCTION (Figure 1-4)

Figure 1-4. PS528-Series Oven Components Locations

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SECTION 1

DESCRIPTION

II. COMPONENT FUNCTION

A. Conveyor Motor and Conveyor Belt

The conveyor belt is driven by a variable-speed electric

motor (Figure 1-5) operating through a gear reducer.

The motor speed is controlled by a digital control. The

stainless-steel wire belt can travel in either direction at

variable rates ranging from 3 minutes to 30 minutes;

this is the time that a product can take to pass through

the oven.

B. Blower Fan

The blower fans are located at the rear of the oven.

These blowers force heated air through the air ﬁngers.

The BLOWER switch must be set to “ON” or “I” for oven

warmup and baking.

C. Gas Burner

The gas burner is located inside the rear panel and is

controlled by the temperature controller.

Blower Assembly

D. Cooling Fan — See Figure 1-5 and Figure 1-6

The cooling fan is located in the back of the oven.

The cooling fan draws air through its grille, blowing it

through the blower motor compartment and the control

compartments into the oven top and exhausted out the

front louvers.

E. Air Fingers and Blank Plates - See Figure 1-7

E1. Air Fingers

An Air Finger Assembly is made up of three parts:

1. Outer Plate - The Outer Plate is the removable cover-

ing with tapered holes, which direct the air stream onto

the product being baked.

2. Inner Plate -The perforated Inner Plate is vital in

forming the unique air jets. It must be assembled into

the manifold with its holes aligned with the holes of the

outer plate.

3. Manifold - The Manifold is the assembly which slides

on tracks into the oven plenum.

Right Control Box

Figure 1-5. Machinery Compartment

Components

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SECTION 1

DESCRIPTION

Figure 1-6. Cooling Fan

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SECTION 1

DESCRIPTION

F2. Blank Plates

1. Blank Plates- The Blank Plates are available to install

on the plenum where an air ﬁnger is not required.

Figure 1-7. Blank Plates (two sizes) and an Air Finger.

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SECTION 2

INSTALLATION

SECTION 2

INSTALLATION

WARNING - For gas ovens, after any conversions, readjustments, or service work on the oven:

•

Perform a gas leak test.

Test for correct air supply.

Test for proper combustion and gas supply.

Check that the ventilation system is in operation.

WARNING

Keep the appliance area free and clear of combustibles.

WARNING

The oven must be installed on an even (level) non-ﬂammable ﬂooring and any adjacent walls must be

non-ﬂammable. Recommended minimum clearances are speciﬁed in the Description section of this

Manual.

WARNING

Do not obstruct the ﬂow of combustion and ventilation air to and from your oven. There must be no

obstructions around or underneath the oven. Constructional changes to the area where the oven is

installed shall not affect the air supply to the oven.

CAUTION

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 supersede 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. Installed ovens 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. Installed ovens 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 Codes AG311 and AG601.

NOTE

In CE countries, all aspects of the gas supply connection must comply with current IEC/CEE requirements and with

all applicable local, national, and international codes. In addition, four casters are provided to allow the oven to be

more easily moved to the installation location. These casters are intended to simplify pre-installation movement

only, and are NOT suitable for use as part of a CE oven installation. During the installation procedure, the casters

MUST be removed, so that the oven can be supported by the supplied 152mm adjustable legs.

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SECTION 2

INSTALLATION

NOTE: The oven, when installed, must be electrically

groundedinaccordancewithlocalcodes,orintheabsence

of local codes, with the National Electrical Code (NEC),

or ANSI/NFPA70.

I. UNLOADING

Your Middleby Marshall PS528-Series Oven is shipped

partially assembled. It will arrive in a carton on a crate.

Thecrateandcartonmustbeexaminedbeforesigningthe

Bill of Lading. Report any visible damage to the transport

company, and check for the proper number of crates. If

apparent damage is found, make arrangements to ﬁle a

claim against the carrier. Surface Interstate Commerce

Regulations (U.S.A.) require that the claim must be initi-

ated by the consignee within 10 days from the date that

the shipment is received.

NOTE

There must be adequate clearance between

the oven and any adjacent combustible con-

struction. Clearance must also be provided

for servicing and for operation.

CAUTION

Itisrecommendedthattheovenbeplacedunder

a ventilation hood for adequate air supply and

ventilation.

CAUTION

Do not obstruct the ﬂow of ventilation air to and

from your oven. Do not obstruct the fan holes in

the rear of the unit.

PARTS LIST FOR SERIES PS528 GAS OVEN

INSTALLATION KIT

Single Stack Oven

P/N 63946

ITEM

NO.

QTY

PART NO.

3101908

DESCRIPTION

LEG 4″ AD FT

62208

62206

INSULATION BOTTOM TRAY

BOTTOM TRAY WELDMENT

TOP COVER

61650

51387

SCREW MSSLT THREAD 8-32 × 1/2, 18-8

GAS HOSE RESTRAINT CABLE

GAS HOSE

22450-0228

22361-0001

49975

CORD & PLUG NEMA L6-20P

MANUAL GAS VALVE, 3/4″ × 1/2, COUPLER

REDUCER, 3/4″ – 1/2″

23115-0009

31823

62207

INSULATION

Figure 2-1. PS528-Series Gas Oven Installation Parts

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SECTION 2

INSTALLATION

PARTS LIST FOR SERIES PS528 Gas OVEN

INSTALLATION KIT Double Stack Oven P/N 63947

ITEM NO.

QTY

PART NO.

62208

DESCRIPTION

INSULATION BOTTOM TRAY

BOTTOM TRAY WELDMENT

TOP COVER

62206

61650

51387

SCREW MSSLT THREAD 8-32 × 1/2, 18-8

LEG 4″ AD FT

GAS HOSE RESTRAINT CABLE

GAS HOSE

CORD & PLUG NEMA L6-20P

MANUAL GAS VALVE, 3/4″ × 1/2, COUPLER

3101908

22450-0228

22361-0001

49975

23115-0009

31823

59227

62207

REDUCER, 3/4″ – 1/2″

HEAT GUARD

INSULATION

PARTS LIST FOR SERIES PS528 Gas OVEN

INSTALLATION KIT Triple Stack Oven P/N 63948

ITEM NO.

QTY

PART NO.

62208

62206

DESCRIPTION

INSULATION BOTTOM TRAY

BOTTOM TRAY WELDMENT

TOP COVER

61650

51387

M3828

SCREW MSSLT THREAD 8-32 × 1/2, 18-8

PIN, ALIGNMENT

22450-0228

22361-0001

49975

23115-0009

31823

GAS HOSE RESTRAINT CABLE

GAS HOSE

CORD & PLUG NEMA L6-20P

MANUAL GAS VALVE, 3/4″ × 1/2, COUPLER

REDUCER, 3/4″ – 1/2″

HEAT GUARD

59227

62207

INSULATION

Figure 2-1 (continued). PS528-Series Gas Oven Installation Parts

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SECTION 2

INSTALLATION

Figure 2-5. MODEL PS528 SINGLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch minimum

to 3-3/4 inch maximum in 1/2 inch increments.

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SECTION 2

INSTALLATION

Figure 2-6. MODEL PS528 DOUBLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch mini-

mum to 3-3/4 inch maximum in 1/2 inch increments.

P/N 59927 is shown in its correct installed position.

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SECTION 2

INSTALLATION

Figure 2-7. MODEL PS528 TRIPLE OVEN DIMENSIONS

The Opening Height is Adjustable from 2-1/4 inch mini-

mum to 3-3/4 inch maximum in 1/2 inch increments.

P/N 59927 is shown in its correct installed position.

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SECTION 2

INSTALLATION

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS528-SERIES OVENS

WARNING

DO NOT USE CONDUIT OR GAS LINE

FOR GROUND CONNECTION.

CAUTION

IT IS RECOMMENDED THAT THE OVEN

BE PLACED UNDER A VENTILATION

HOOD FOR ADEQUATE AIR SUPPLY

AND VENTILATION.

ELECTRIC SUPPLY TO BE

PROVIDED BY CUSTOMER

CIRCUIT BREAKER

Figure 2-9. Typical PS528-Series Oven(s)

Installation

Separate circuit breaker with lockout/tagout electrical

shutoff for each oven. Wire each oven separately.

15A Amp circuit breaker for 208-240V.

CAUTION

ELECTRICAL SPECIFICATIONS

UNIT MUST HAVE AIR VENT PLATES

INSTALLED OR WARRANTY WILL BE VOID.

DOMESTIC: 208V main blower motors, 1 Ph, 1.5 Amp

draw, 50/60 Hz, 208-240V control circuit, 2 pole, 3 wire

system per oven (2 hot, 1 grd).

II. VENTILATION GUIDELINES

Do NOT use conduit for ground.

A mechanically driven ventilation system is required for

the PS528 Series Middleby Marshall conveyorized gas

ovens.

DOMESTIC or EXPORT: 240V main blower motors, 1

Ph, 1.5 Amp draw, 50/60 Hz, 208-240V control circuit, 2

pole, 3 wire system per oven (2 hot, 1 grd).

Local codes and conditions vary greatly from one area

to another and must be complied with. Following are

the suggested requirements for good ventilation. Please

rememberthesearerecommendationsorguidelines,you

may have a special condition or problem that will require

theservicesofaventilationengineerorspecialist. Proper

ventilation is the oven owner’s responsibility. Improper

ventilation can inhibit oven performance.

230Vmainblowermotors, 1Ph, 1.5Ampdraw, 50/60Hz,

208-240V control circuit, 2 pole, 3 wire system per oven

(2 hot, 1 grd).

Do NOT use conduit for ground.

A 6 foot cord with a NEMA L6-20 plug is supplied on

Domestic units.

Please Note: There are now two “stand off” ‘C’Chan-

nelsand“HeatGuards”for“DoubleandTripleOvens”

that must be installed in the ﬁeld.

POWER RATING

50,000 BTU/hr (14.7 kW/hr.)

SUPPLY WIRE

Supply wire size must be in accordance with the National

Electrical Code (current edition) and must be in compli-

ance with local codes.

Please Note: There is now one heat guard on dou-

ble units and two heat guards on triple units. See

Figure 2-7.

These ‘C’ Channel brackets are installed in the vertical

plane using existing screws (Item 6) to support these ‘C’

Channels using the upper and lower Key Hole openings

in the ‘C’ Channels. The ‘C’ Channels are identical and

once installed will allow ample amounts of air through

the cooling fan mounted on the rear side of the oven by

keeping the oven away from the rear wall.

SUGGESTED

If space permits, service should be located near the

control console end of the oven(s) to allow convenient

access to safety switches.

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SECTION 2

INSTALLATION

III. ELECTRICAL CONNECTION

INFORMATION FOR PS528-SERIES

OVENS.

IV. ELECTRIC SUPPLY FOR GAS HEATED

OVENS

Power requirements for gas heated ovens are 208 -

240VAC, 1-phase, 3-wire (2 ‘hot’, 1 ground). Electrical

connection is made through a cord and plug. Using

ﬂexiblecable(s)fortheelectricalpowersupplyconductors

requires a 2″ (51mm) strain-relief ﬁtting (not furnished)

to enable safe access to the terminal block from which

oven power is distributed.

WARNING

Authorized supplier personnel normally accom-

plish the connections for the ventilation system,

electric and gas supplies, as arranged by the

customer. Following these connections, the

factory-authorizedinstallercanperformtheinitial

startup of the oven.

The supply conductors must be of the size and material

(copper) recommended to provide the current required;

(refer to the data plate for the ampere speciﬁcations).

The electric current rating for each conductor supplying

a PS528-Series Oven is 1.5A.

Check the oven data plate (Figure 2-10) before making

any electric supply connections. Electric supply connec-

tions must agree with data on the oven data plate.

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 regula-

tions.

A fused disconnect switch or a main circuit breaker

(customer furnished) MUST be installed in the electric

supply line for each oven; it is recommended that this

switch/circuitbreakerhavelockout/tagoutcapability.The

electricsupplyconnectionmustmeetallnationalandlocal

electricalcoderequirements.Copperistherecommended

material for the electrical supply conductors.

ELECTRICAL

INLET

GAS INLET

Figure 2-11. Junction Connection Box

Figure 2-10. Typical Electric Oven Data Plate

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SECTION 2

INSTALLATION

pressure tap of gas control concerned, to measure burner

pressure (measuring point must be as near to burner as

possible).

V. GAS SUPPLY

CAUTION

3. MakesurethattheapplianceisinoperationandtheModuplus^®

DURING PRESSURE TESTING NOTE THE FOLLOWING:

coil is energized with maximum current.

1. The oven and its individual shutoff valve must be dis-

connected 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).

4. If maximum rate pressure needs adjustment, use an 8 mm

wrenchtoturnadjustmentscrewformaximumpressuresetting

(clockwise to increase or counter-clockwise to decrease

pressure), until the desired maximum outlet pressure is

obtained.

2. The oven must be isolated from the gas supply piping

systembyclosingitsindividualmanualshutoffvalvedur-

ing any pressure testing of the gas supply piping system

at test pressure equal to or less than 1/2 psi (3.45 kPa).

5. Disconnect electrical connection of the Moduplus^®.

6. Check minimum pressure setting and readjust if necessary.

(SeeAdjustingMinimumPressureSettingforproperadjusting

procedure.)

3. If incoming pressure is over 14" W.C. (35mbar), a sepa-

rate regulator MUST be installed in the line BEFORE the

individual shutoff valve for the oven.

7. Reconnect pressure feedback connection (if applicable).

8. If minimum and maximum pressures are set, wire the

WARNING: To prevent damage to the control valve regu-

lator during initial turn- on of gas, it is very important to

open the manual shutoff valve very slowly.

Moduplus^®in circuit.

9. Close pressure tap screw.

Aftertheinitialgasturn-on,themanualshutoffvalvemust

remain open except during pressure testing as outlined

in the above steps or when necessary during service

maintenance.

E. Adjusting the Minimum Pressure Setting

1. Disconnect pressure feedback connection (if appcable).

2. Connect a suitable pressure gauge to pipe line or to outlet

pressure tap of gas control concerned, to measure burner

pressure (measuring point must be as near to burner as

possible).

A. Gas Utility Rough-In Recommendations

3. Disconnect electrical connection of the Moduplus^®.

The following gas system specifications are STRONGLY

RECOMMENDED. Deviating from these recommendations may

affect the baking performance of the oven.

4. Energize operator, set control in operation and wait until an

outlet pressure is recorded on pressure gauge.

5. If minimum rate pressure needs adjustment, use an 8 mm

wrenchtoturnadjustmentscrewforminimumpressuresetting

(clockwise to increase or counter-clockwise to decrease

pressure), until the desired minimum outlet pressure is

obtained.

Gas Meter - 650 cfh (307/min) meter

Gas Line

•

DEDICATED LINE from the gas meter to the oven

1-1/2" (38.1mm) 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.

6. Check if main burner lights easily and reliable at minimum

pressure.

7. Reconnect pressure feedback connection (if applicable).

8. Close pressure tap screw.

B. Gas Conversion

Where permitted by local and national codes, it is possible to

convert ovens from natural to propane gas, or from propane to

natural gas. Use the appropriate Middleby Gas Conversion Kit

for the speciﬁc oven model.

Figure 2-15 - Flexible Gas Hose Installation

CAUTION: The terms of the oven’s warranty require all start-

ups, conversionsandserviceworktobeperformed

by a Middleby Authorized Service Agent.

1/2" gas

pipe nipple

3/4"-1/2"

gas pipe

reducer

Supply

To Gas

Pipe

C. PS528 Propane Conversion

3/4" gas

Two items have to be changed, to change the oven to LP:

1. Replace main oriﬁces.

pipe nipple

1/2" gas

line tee with

pressure tap

90°

Elbow

2. Adjust main gas regulator per instructions below.

Disconnect the manifold union closest to the main burner, and

removethemanifoldassembly(fourscrews).Slideoutthemanifold

assembly (leaving the ignition and sense wires connected).

Replace the main oriﬁces.

Full-Flow

Gas

Shutoff

Valve

Replace the main oriﬁces on the manifold assemblies with the LP

units, and replace the manifold assembly. Reconnect the union.

Individual gas

connection

Flexible

D. Adjusting the Maximum Pressure Setting

Quick-

Gas Hose

for each oven

disconnect

1. Disconnect pressure feedback connection (if applicable).

2. Connect a suitable pressure gauge to pipe line or to outlet

cavity

device

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SECTION 2

INSTALLATION

G. Maintenance

Figure 2-16. Gas Burner Assembly

Gas Burner

It is recommended to check yearly the minimum and the

maximum setting and readjust them if necessary.

H. Connection

WARNING

Some procedures in this section may require

conversions, readjustments, or service on the

oven's gas system. Before performing these

procedures, check that the main gas supply valve and

the circuit breaker/fused disconnect are in the OFF ("O")

position. After completing these procedures, perform a

gas leak test before operating the oven.

CAUTION

The terms of the oven's warranty require all start-ups, con-

versions and service work to be performed by a Middleby

Marshall Authorized Service Agent. The installation, start-up

and changes required when changing from one gas type to

another can be performed ONLY by a certiﬁed professional.

Manifold Pressure Tap

Figure 2-17. Burner Assembly

NOTE:Certainsafetycoderequirementsexistfortheinstallation

of gas ovens; refer to the beginning of Section 2 for a list of

the installation standards. In addition:

Main Oriﬁces

Gas Burner

Assembly

•

IntheUSA, theinstallationmustconformwithlocalcodes,

or in the absence of local codes, with the National Fuel

Gas Code, ANSI Z223.1.

•

InCanada, theinstallation mustconform with local codes,

or in the absence of local codes, with the Natural Gas

Installation Code, CAN/CGA-B 149.1, or the Propane

Installation Code, CAN/CGA-B 149.2, as applicable.

•

InAustralia,theinstallationmustconformwithAGACodes

AG311 and AG601, and with any requirements of the

appropriate statutory authority.

Gas Valve

Manifold Pressure Tap

In CE countries, the gas supply connection should be

according to EN-203 (gas appliance directive) and to

applicable ISO 228-1 or ISO 7-1 recommendations. All

aspects of the gas supply connection must comply with

current IEC/CEE requirements and with all applicable

local, national, and international codes.

Figure 2-18. Gas Valve

Adjustment Screw (5 mm)

for minimum pressure

setting

Adjustment

Screw (8 mm) for

maximum

•

Forallovensequippedwithcasters,thegaslineconnection

shall be made with:

pressure

setting

A connector that complies with the Standard for

ConnectorsforMovableGasAppliances,ANSIZ21.69

(inUSA),orConnectorsforMovableGasAppliances,

CAN/CGA-6.16 (in Canada).

Check the oven’s gas supply requirements to determine the

type of gas to be used with the oven. If the gas type required

does NOT match the local supply:

•

For North American installations, a conversion kit is

supplied with the oven to allow operation using propane

gas. Refer to Part B, Gas Conversion, in this section.

•

For CE ovens, directions for converting the oven for use

with other gases are described in Part D.1, Preparation

for Use with Various Gases, in this section.

F. Checkout

After any adjustment, set appliance in operation and observe

through a component cycle to ensure that burner system

components function correctly.

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SECTION 2

INSTALLATION

If the installation will use the supplied gas hose, be sure that the

1/2" to 3/4" gas line ﬁtting is attached. Refer to the instructions

in the gas hose package. One gas line connection method is

shown in Figure 2-15; however, compliance with the applicable

standards and regulations is mandatory.

Inlet and regulated gas pressures can be measured using

a “U” tube manometer at the tap locations shown in Figures

2-15 and 2-16.

1. Checking the Gas Supply (Inlet) Pressure

a. With the main gas supply valve closed and the circuit

breaker/fused disconnect in the OFF ("O") position, open

the inlet pressure tap shown in Figure 2-16 and attach a

manometer to the tap.

b. Depress the safety switches to allow the oven to operate.

c. Openthemaingassupplyvalve. Switchthecircuitbreaker/

fused disconnect to the ON ("I") position.

d. Start the oven according the directions in the Operation

section of this Manual. Adjust the temperature controller

to the maximum setting (316°C).

e. Measure the supply (inlet) pressure.

f. Switch the oven off. Close the main gas supply valve, and

switchthecircuitbreaker/fuseddisconnecttotheOFF("O")

position. Remove the manometer, and close the inlet tap.

g. Compare the measured supply (inlet) pressure to the

nominal pressures shown in Table 1-5 (in the Description

section of this Manual).

If the supply pressure is lower or higher than the nominal

pressure, the reason should be investigated and the gas

supplier contacted.

Fornaturalgasovens, ifthemeasuredsupplypressureislower

than0.247psi, orhigherthan0.363psi, contactthegassupplier.

DO NOT OPERATE THE OVEN or adjust the oven controls.

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SECTION 2

INSTALLATION

NOTES

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SECTION 3

OPERATION

SECTION 3

OPERATION

I. CONTROL FUNCTIONS

Figure 3-1. PS528-Series Oven Control Functions

WARNING

A possibility of injury from rotating parts and

electric shock exists in this oven.

Never disassemble or clean the oven with the

BLOWER switch or any other oven control

turned “ON” or “I”. Turn “OFF” or “O” and lockout

or tagout all electric power to the oven before

attempting to clean or service this oven.

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SECTION 3

OPERATION

If the temperature inside the oven is over 180°F (82°C)

themainblowerwillcontinuetorunaftertheblowerswitch

is turned to the “OFF” or “O” position.

II. COMPONENT INFORMATION AND

LOCATION (Figures 3-1 and 3-2)

A. Door Safety Switch

C. Heat Switch

The Door Safety Switch is located at the lower right side

of control panel opening. Opening the control panel door

permits this switch to open, disconnecting power to all

electrical controls.

The“HeatSwitch”allowstheburnertoactivate.Activation

is determined by the settings on the Digital Temperature

Controller.

D. Temperature Controller

The temperature controller is a solid-state, PID type to

maintain the operator-set temperature. The temperature

controller continuously monitors the oven temperature

and turns on the modulating solid state relay controller.

Theheatisonforthetimerequiredtomaintainaconstant

oven temperature.

CAUTION

Do NOT touch the wires going to this safety

switch. Current is always present.

B. Blower Switch

The temperature controller contains a low-limit switch

which allows the oven to cool down to 200°F (93°C)

before shutting off the blower. A high-limit indication

(ALM 1) will appear on the display if the oven reaches

650°F (343°C).

The blower switch has two positions. The switch must be

“ON” or “I” for the main blowers to come on and permit

the oven to run. The fan circulates the air throughout the

oven and must stay on during baking and during the cool

downcycleabove200°F(93°C)topreventblowerbearing

damage. To protect the blower motor and bearings a

thermostatic override is built into the oven.

Figure 3-2. Interior View of Control Console

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SECTION 3

OPERATION

E. Conveyor

The on-off switch for the conveyor motor is on the con-

trol panel. Also on the control panel is the digital con-

veyor speed control. The digital control can be adjusted

from 1-10 min. bake time (conveyor speed).

Refer to Figure 3-3.

Conveyor speed is measured by the amount of time it

takes for an item to go through the bake chamber of the

oven.

MEASURING CONVEYOR SPEED.

See Figures 3-4 and 3-5.

Figure 3-3. Conveyor Speed Digital Control

To check conveyor speed, place a product item at the

entrance end of baking chamber as shown. Time how

long it takes for the leading edge of the item to go from

the entrance end of the baking chamber to the exit end.

This should be the conveyor speed shown on the con-

veyor speed digital control.

NOTE: In Figures 3-4 and 3-5, the oven shown is with

the conveyor running right to left.

WARNING

Possibility of injury from rotating parts and

electrical shock exist in this oven.

Never disassemble or clean the oven with the

blower switch or any other part of the oven

turned “ON” or “I”. Turn “OFF” or “O” and lock-

out or tagout all electrical power to the oven

before attempting to clean or service

this oven.

Figure 3-4. Product at entrance end of baking

chamber – BEGINNING OF TIMING

Figure 3-5. Product at exit end of baking

chamber – END OF TIMING

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SECTION 3

OPERATION

4. Set the temperature controller to the desired baking

temperature.

WARNING

OVEN MUST BE KEPT CLEAR OF

NOTE: For complete temperature controller operation

instructions refer to Step C.

COMBUSTIBLES AT ALL TIMES.

5. Turn the HEAT switch (Figure 3-6) to the “ON” or “I”

position. Wait for the “Heat ON” light to turn on.

III. STEP-BY-STEP OPERATION

A. Startup Procedures

Daily Startup

6. Ovenwillreachabakingtemperatureof500°F(232°C)

in approximately 20 minutes. Allow the oven to cycle for

30minutesafterithasreacheddesiredbaketemperature.

The oven is now ready for baking.

1. TurntheBLOWERswitch(Figure3-6)tothe“ON”or“I”

position. This starts the main blower fan and the cooling

fans. The blower circulates air through the air ﬁngers and

must stay on during the cooking or baking process.

Power Failure

In case of power failure, turn off all switches and remove

product. After power has been reestablished follow

normal startup procedure.

2. Check to see if the cooling fans (see Figure 1-8) are

operatingwhentheblowerswitch(seeFigure3-6)isturned

“ON” or “I”. The cooling fans cool the control components

and blower motor. The cooling fans, located at the rear

of the oven blows air into and through the cabinet. Air is

exhausted through the front of the cabinet and also out

the front of the oven. Refer to Daily Maintenance Section

for fan intake checking procedure.

B. Shutdown Procedure

1. Turn the BLOWER and HEAT switches to “OFF” or

“O”.

NOTE: The blowers will remain on until the oven tem-

perature cools down to 200°F (93°C) at which time they

will stop automatically.

IMPORTANT NOTE

2. Make certain that there are no products left on the

conveyor inside the oven. Turn the CONVEYOR switch

to “OFF” or “O”.

The cooling fan operates when the BLOWER

switch is turned “ON” or “I”. It must operate to

keep the control console below 140°F (60°C).

3. TurntheCONVEYORswitch(Figure3-6)tothe“ON”or

“I” position. This starts the conveyor belt moving through

the oven. Set the conveyor speed for the desired baking

time. Refer to the following Procedures E, F and G.

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SECTION 3

OPERATION

Figure 3-6. Control Panel

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SECTION 3

OPERATION

thesetpointtemperature. Highersetpointtemperatureswill

require a longer wait. The oven can reach a temperature

of 500°F (232°C) in approximately 15 minutes.

IV. NORMAL OPERATION - STEP-BY-STEP

A.Daily Startup Procedure

1. Check that the circuit breaker/fused disconnect is in the

on position.

8. (Optional)PresstheTemperature( )keytoshowtheActual

Temperatureinthedisplay,

and wait for the "ACTUAL

TEMP" light to turn on.

This allows you to monitor

the oven temperature as it

rises to the setpoint.

2. Turn the "BLOWER"

wait

for

(

) switch to the “ON”

("I") position.

9. Allow the oven to preheat

for 10 minutes after it has

reached the set point tem-

3. Turnthe"CONVEYOR"

perature.

(

)switchtothe“ON”

("I") position.

B. DAILY SHUTDOWN PROCEDURE

1. Turn the "HEAT" ( ) and "BLOWER" ( ) switches to

the "OFF" ("O") position.

Note that the blowers will

remain in operation until

the oven has cooled to

below 200°F (93°C).

4. If necessary, adjust the

conveyor speed setting

by pressing the

pushbuttons on the

conveyorspeedcontroller

to change the displayed

bake time.

2. Make certain that there

are no products left on the

conveyor inside the oven.

5. Adjust the temperature

controller to a desired set

temperature,ifnecessary.

Turn the "CONVEYOR" (

) switch to the "OFF"

("O") position.

wait

for

•

Press the Set Point

and Unlock keys at

the same time. Wait

for the "SETPT" light

to turn on.

3. After the oven has cooled

and the blowers have

turned to the “OFF” or “O”

position, switch the circuit breaker/fuse disconnect to the

“OFF” or “O” position.

•

Press the Up Arrow

and Down Arrow

Keysasnecessaryto

adjust the set-point.

IMPORTANT

6. Turn the "HEAT" (

)

Ongasovens, ifthe"HEATON"lightwillnotilluminate, OR

if the oven does not heat, the gas burner may not have lit.

Turnthe"HEAT"( ),"BLOWER"( ),and"CONVEYOR"

(

) switches to the "OFF" ("O") position. Wait for AT

LEAST FIVE MINUTES before restarting the oven. Then,

repeat the Daily Startup procedure.

switch to the "ON" ("I")

position, and wait for the

"HEAT ON" light to turn

on.

CAUTION

7. Waitfortheoventoheatto

In case of power failure, turn all switches to the “OFF”

("O")positionandremovetheproduct. Afterthepower

has been restored, perform the normal startup pro-

cedure. IF THE OVEN WAS SWITCHED OFF FOR

LESSTHAN 5 MINUTES, WAITFORATLEASTFIVE

MINUTES BEFORE RESTARTING THE OVEN.

wait

for

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SECTION 3

OPERATION

Display

"HEAT ON" Light

Lights when the

burner is in

Shows the Set Point

or the Actual Tem-

perature in degrees

Fahrenheit (F) or

Celsius (C).

operation.

"SP LOCK"

Light

Lights when the set

point is locked out

from changes. This

setting can only be

changed by service

personnel.

"SET PT" (set-

point) 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 Refer-

ence: Troubleshoot-

ing in this section.

"ACTUAL TEMP"

Light

Lights when the Actual

Temperature is shown

in the display.

Service Key

Service use

only.

Temperature Key

Press this key once

to view the Actual

Temperature in the

Display.

Set Point Key

Press this key togeth-

er with the Unlock Key

to allow the Set Point

to be changed.

Changes can only be

made for 60 seconds.

Unlock Key

Press this key togeth-

er with the Set Point

Key to allow the Set

Point to be changed.

Changes can only be

made for 60 seconds.

Up Arrow and Down

Arrow Keys

Press these keys to adjust

the Set Point up or down.

If the Set Point will not

change, refer to Set Point

Key and Unlock Key in this

section.

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SECTION 3

OPERATION

V. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM

PROBLEM

SOLUTION

The oven temperature

exceeded 650°F (343°C),

and the burner was

automatically shut down.

•

Follow the procedures under Daily Shutdown Procedures in this

section to shut down the oven. Contact your Middleby Marshall

Authorized ServiceAgent to determine and correct the cause of

the condition to prevent damage to the oven.

light is lit, food product is

undercooked

Oven will not

turn on at all

Electrical power may not

be reaching the oven, or

the controls may be set

incorrectly.

•

Check that the circuit breaker/fused disconnect is turned on.

Checkthatthe"BLOWER"( ) Switchisinthe“ON”("I")position.

Turn the "HEAT" ( ), "BLOWER" ( ), and "CONVEYOR" (

The oven did not reach

200°F (93°C) within 15

minutes of startup, and the

oven has stopped heating.

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

•

Wait forAT LEAST FIVE MINUTES before restarting the oven.

Repeat the Daily Startup procedure.

Check that the Set Point is correctly set.

appears in display,

oven is not heating

Checkthatboththe"BLOWER"( )and"HEAT"( )Switches

Controls may be set

incorrectly.

are in the “ON” ("I") position.

Oven will not heat

•

Iftheovenstillwillnotheat,turnthe"HEAT"( ),"BLOWER"(

), and "CONVEYOR" (

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

•

Wait for AT LEAST FIVE MINUTES before restarting the oven.

Repeat the Daily Startup procedure. Check that the Set Point

is above 200°F (93°C).

•

Turn the oven to the “OFF” or “O” position, and allow it to cool.

Disconnect electrical power to the oven.

RefertoSection4,Maintenance,forinstructionsonreassembling

Oven is operating, but little

or no air is blowing from air

ﬁngers

Air ﬁngers may have been

reassembled incorrectly

after cleaning.

the air ﬁngers.

•

Turn the oven to the “OFF” or “O” position, and allow it to cool.

Disconnect electrical power to the oven.

•

Check if the conveyor is blocked by an object inside the oven.

Refer to Section 4, Maintenance, for instructions on checking

the conveyor and drive chain tension.

Conveyor moves with a

jerky motion, or will not

move at all

Conveyor may be jammed

on an object in the oven, or

conveyor belt or drive chain

tension may be incorrect.

•

Check that the set temperature and bake time settings are

correct.

Food products are over-

cooked or undercooked.

Controls may be set incor-

rectly.

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.

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SECTION 4

MAINTENANCE

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 the full-ﬂow gas safety valve to the off position.

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

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

When all cleaning and servicing is complete:

4. Turn on the full-ﬂow gas safety valve. Test the gas line

connectionsforleaksusingapprovedleaktestsubstances

or thick soap suds.

1. If the oven was moved for servicing, return the oven to its

original location.

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

2. Reconnect the gas supply.

3. Reconnect the electrical supply.

6. Perform the normal startup procedure.

WARNING

Possibility of injury from rotating parts and electrical

shock exist in this oven. Turn off and lockout or

tagout electrical supply to oven(s) before attempting

to disassemble, clean or service oven(s). Never

disassemble or clean the oven with the blower switch

or any other part of the oven turned on.

WARNING

Before performing any maintenance work or cleaning,

turn main power switch off.

CAUTION

When cleaning do not use any abrasive cleaning

materials or water spray, wipe clean only. Never use a

water hose or pressurized steam cleaning equipment

when cleaning this oven.

NOTICE

If the oven is to be removed from its installed location

for servicing, 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 main circuit breakers and disconnect

connector from oven.

3. Move oven to desired location for servicing.

4. When servicing is complete, move oven to original

location.

5. Adjust legs to level oven.

6. Connect electrical connectors to oven.

7. Turn on main circuit breakers.

8. Follow normal startup instructions.

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SECTION 4

MAINTENANCE

D. Crumb Pans (Figure 4-2)

I. MAINTENANCE - DAILY

A. Exterior

WARNING

Everyday you should clean the outside of the oven with

a soft cloth and mild detergent.

Crumb pan is extremely hot while oven

is operating. Allow oven to cool before

removing crumb pan.

WARNING

Never use a water hose or pressurized steam

cleaning equipment when cleaning the oven.

Whentheoveniscoolremoveandcleanthecrumbpanat

each end of the oven. Each crumb pan can be removed

by sliding it out, as shown in Figure 4-2. Reinstall the

crumb pans after cleaning.

B. Cooling Fan

II. MAINTENANCE - MONTHLY

1. ONECOOLINGFANGRILLEATTHEREAROFTHE

OVEN MUST BE CLEANED DAILY - Clean grille with a

stiff nylon type brush.

2. Check the air intake of the cooling fan daily. The best

time to check is right after starting the oven.

IMPORTANT NOTE

Thecoolingfanoperateswhentheblowerswitch

is turned to “ON” (“I”). It must operate to keep the

electrical control cabinet below 140°F (60°C).

Figure 4-1. Oven Cooling Fans

WARNING

IF FAN BLADE IS NOT ROTATING, BROKEN,

OR FAN ASSEMBLY IS MISSING FROM MAIN

BLOWERMOTORSHAFT,DONOTOPERATE

OVEN. REPLACE COOLING FAN BLADE

BEFOREOPERATINGOVEN.Seriousdamage

could be done to the burner blower motor and/

or solid-state electrical components if oven is

operated while cooling fan is not running or vent

grille is plugged.

3. Using a stiff nylon brush clean control compartment

vent grille.

C. Conveyor Belt (Figure 4-2)

Everyday, just after starting the oven, stand at the un-

loading end of the conveyor, and with a brush, remove

foodparticles(crumbs, etc.)clingingtotheconveyorbelt,

brushing them into the crumb pan.

Figure 4-2. Conveyor Belt and

Crumb Pan Cleaning

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SECTION 4

MAINTENANCE

NOTE: The oven interior may require cleaning

thanonceamonthdependingonthevolumeofbaking.

To clean the interior, you have to disassemble some

parts of the oven.

You can order non-caustic cleaner from your local

authorized Middleby Marshall Parts Distributor in the

quantities listed:

Part #

Quantity

27170-0244

27170-0246

Case of Quarts (6)

Case of Gallons (4)

When cleaning your Series PS528 Oven note the

following:

PRECAUTIONS-

A. Removing Conveyor From Oven For Cleaning

1. Do not use excessive water or saturation of oven

insulation will occur.

1. Remove entry and exit trays.

2. Loosen (do not remove) two screws on housing

guard.

2. Do not use a caustic oven cleaner or the aluminized

ﬁnger manifold surfaces will be severely damaged.

3. Remove motor housing guard.

When cleaning your oven, ﬁrst remove all heavy debris

with a vacuum cleaner. Use a damp cloth for light clean-

ing. For heavier cleaning of baked on grease and carbon

deposits use a non-caustic cleaner that will not react with

the aluminized ﬁnger manifold surfaces.

4. Lift conveyor and remove chain.

5. Lift other side of conveyor and push toward other

Figure 4-3.

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SECTION 4

MAINTENANCE

side.

6. Remove conveyor as shown.

Figure 4-6.

Figure 4-4.

Figure 4-7.

CAUTION

Figure 4-5.

Be careful not to bump the drive sprocket

while handling the conveyor, to avoid

damaging the drive shaft.

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SECTION 4

MAINTENANCE

B. Air Fingers Disassembly For Cleaning

1. As the air ﬁngers are removed use a felt pen to mark

all parts of the ﬁngers. This includes the ﬁnger manifold,

inner plate and the outer plate (refer to Figure 1-9). If a

blankorchokeplateisused,markthatplatealso.Fingers

are marked in the order shown; as viewed from the front

of the oven. (The marks for an upper oven should be

preceded with a “U”, example UB1, UT2, etc.)

Standard Fingers

2. Slide blank plates straight out.

Figure 4-9.

4. With air ﬁngers out, place them in an upright position

to remove the outer plate.

5. Gently step on the lip of the ﬁnger and pull the outer

plate off.

Figure 4-8.

3. Remove air ﬁngers.

NOTE:Someovenusersrequireacustomﬁngerarrange-

ment where the quantity of air ﬁngers may vary.

You can remove top and bottom ﬁngers and blank

plates from each or either end. It is highly recommended

that each ﬁnger be marked before removing so it is

placed in exactly the same position when reassembled

(refer to step 1).

Remove the air ﬁngers, pull the ﬁnger at the back side

- pull straight out.

Figure 4-10.

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SECTION 4

MAINTENANCE

6. To remove the inner plate, pull the plate out and then up.

C. Reassembly of Air Fingers

1. Air ﬁngers are made up of one inner plate, one outer

plate and the ﬁnger housing manifold. Be sure to match

up the markings (T1, T2, T3, etc.) on all the parts of the

air ﬁngers as you are reassembling.

Figure 4-11.

7. The outer ﬁnger plate is stainless and may be cleaned

by either soaking in a hot, strong detergent solution or

using a caustic cleaner. The conveyor belt can also be

cleaned in the same way.

Figure 4-14.

2. Reassemble the inner plate. Keep your ﬁngers clear

so you won’t pinch them. The inner plate of a ﬁnger will

only go in one way because of its design.

3. Replace the outer plate by placing your hands ﬂat on

the top of the plate and pushing down. Keep your ﬁngers

clear so you won’t pinch them.

Figure 4-12. Standard Lower Finger

Figure 4-15.

Figure 4-13. Standard Upper Finger

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SECTION 4

MAINTENANCE

4. Replace the air ﬁngers by pushing in at the back side.

Remember to replace them according to the numbers

marked on them when they were removed. They must

go back in the same way they came out.

IMPORTANT: When inserting ﬁngers the tab on

the outer plate must be in the groove as shown

in Figure 4-18. There is a blocking tab on the

outsideofthegroovewhichwillpreventinserting

theﬁngerinthegrooveiftheouterplateismoved

away from the ﬂange of the ﬁnger manifold.

Figure 4-16.

Extended Lip

Tab on

Outer Plate

Flange of

Finger Manifold

Tab on

Outer Plate

Figure 4-17.

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SECTION 4

MAINTENANCE

5. Install ﬁngers and blank plates correctly with edges

interlocked and no space between edges.

Incorrect - Too

Much Space

Top Finger

Blank Plate

Tab on Outer Plate of Finger

Located in Groove

Incorrect - Too

Much Space

Top Finger

Blank Plate

Tab on Outer Plate of Finger

Located in Groove

Correct - Edges

Overlap Com-

pletely

Top Finger

Blank Plate

Tab on Outer Plate of Finger

Located in Groove

Figure 4-18.

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SECTION 4

MAINTENANCE

D. Reinstall End Plugs

1. Reinstall lower end plug. Be sure to tighten the wing

screw on the end plug.

2. Reinstall conveyor.

3. Reinstall upper end plug. Be sure to tighten two wing

screws on the end plug.

Figure 4-19.

Figure 4-20.

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SECTION 4

MAINTENANCE

E. Conveyor Reassembly Into Oven

F. Checking Conveyor Belt Tension

1. Lift conveyor and position it in oven as shown.

WARNING

NOTE:Conveyormaybeinsertedintoeitherendofoven.

If it is to be installed from the non-drive end of the oven

the drive sprocket assembly must be removed as shown

in conveyor disassembly section.

Ovenconveyorbeltmustbecoolwhenadjusting

belt. Do not adjust belt if HOT.

1. With the conveyor assembly in the oven, stand at one

endofconveyorandchecktensionbyliftingtheconveyor

belt at the center of the oven chamber opening. The belt

should not lift higher that 1″ to 2″ (75mm to 102mm).

2. If conveyor belt is still not under proper tension, an

entirelinkmustberemoved. Usethefollowingprocedure

“H. Conveyor Belt Link Removal” to remove a link. If

conveyor belt is under proper tension proceed directly

to “J. Attaching Drive Chain”.

Figure 4-23.

Figure 4-21.

2. Reinstall the conveyor extension.

Conveyor Extension

G. Conveyor Belt Link Removal

Figure 4-22.

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SECTION 4

MAINTENANCE

1. Using long nose pliers, an entire link can be removed

with the conveyor assembly either in or out of the oven.

Position master links at end of conveyor as shown in

Figure 4-24.

4. Unhook the link to be removed.

5. Pull up on the belt link section and remove. Do not

discard the link removed as it may be used for making

spare master links.

NOTE: If a section of the conveyor belt is being replaced

it should be done now. Remove the links that need re-

placing and use the section of conveyor belt furnished

in your installation kit to replace them.

Master

Links

Figure 4-24.

2. Using long nose pliers, unhook master links at left

end of conveyor as shown in Figure 4-25.

Figure 4-27.

NOTE: Before connecting the inside master links, notice

thattheselinkshaveacorrectposition(Figure4-28). The

link at the right is in the correct (horns up) position for

inserting into the conveyor belt. The horns facing down

are in the incorrect position.

Correct

Position

Figure 4-25.

Incorrect

Position

3. Remove the outside master links on the right and left

sides of the conveyor belt as shown in Figure 4-26.

Figure 4-28.

Figure 4-26.

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SECTION 4

MAINTENANCE

6. Reconnect the inside master links (Figure 4-29.)

H. Attaching Drive Chain

1. If drive sprocket assembly was removed reassemble

it into the conveyor drive shaft. Be sure ﬂat on end of

drive shaft aligns with set screw in conveyor shaft collar.

Once in place tighten 3/32″ set screw.

2. Lift conveyor and install drive chain to conveyor drive

sprocket and motor sprocket.

Figure 4-29.

NOTE: The outside master links have right and left sides

to them. The right edge master link has an open hook

facing you as shown in Figure 4-30. This will match up

with the outer edges of the conveyor belt. Remember

this hook travels backwards on the conveyor.

Direction of travel

Figure 4-32.

3. The angle plate located on the underside of the con-

veyor must be against the lower end plug. This is true

on both sides of oven.

Figure 4-30.

7. Reconnect the outside master links.

8. Replace all parts removed from the oven.

Crumb Pan

Mounting

Bracket

Lower End Plug

Figure 4-33.

Figure 4-31.

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SECTION 4

MAINTENANCE

4. Reattach conveyor guard to control panel and secure

two screws.

A. Electrical Terminals

Open the control cabinet door by removing the three

screwsfromthecontrolcabinetdoor.Tightenallelectrical

control terminal screws including the electrical contactor

terminal screws as shown in Figure 4-35.

Install both upper end plugs.

Figure 4-34.

Figure 4-35.

B. Ventilation

III. MAINTENANCE - EVERY 3 MONTHS

Check that the air circulation throughout the oven is not

blocked and is working properly.

WARNING

Shut OFF all electrical power and lock/tag out

the switch before attempting maintenance work.

IV. MAINTENANCE - EVERY 6 MONTHS

A. Check brushes on D.C. conveyor motor, when worn

to less than 1/10″ (2.4mm), replace the brushes.

NOTE:Itisrecommendedthatthe3-monthmaintenance

be performed by an authorized Middleby Marshall

technician.

B. Check your oven venting system.

C. Inspect and clean the burner nozzle and the spark

electrode assembly.

IMPORTANT NOTICES:

• Installation of replacement parts requiring access

to the interior of the oven is permitted only by an

authorized service technician.

• If there are any problems with the operation of

the oven, the authorized service technician must

be called.

• It is suggested to obtain a service contract with a

manufacturer’s authorized service technician.

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SECTION 4

MAINTENANCE

KEY SPARE PARTS KIT

parts that can reduce serious downtime and loss of pro-

duction, if a failure occurs.

An oven can be purchased with a Key Spare Parts Kit

(Figure 4-36). (The kit can be purchased when the oven

is ordered, or later, from a Middleby Marshall Authorized

Parts Distributor). The kit contains many of the crucial

Replacementpartsforthiskitcanbepurchasedfromyour

Middleby Marshall Authorized Parts Distributor.

PS528-SERIES GAS OVEN KEY SPARE PARTS KIT (Figure 4-36)

ITEM

PART NO.

28041-0011

58390

ENGLISH DESCRIPTION

QUANTITY

Contactor, DP 25A 208/240V

Motor, Conveyor Drive w/Magnet

Board, Ampliﬁer Signal, 0-15VDC

XFMR, 240V PRI 24V 65VA SEC

Thermocouple, Type “J” Shielded 2.50 x 120

Filter, RFI

60671

32108

33812-5

33813

38185

Assembly, Pickup Sensor

41872

Transformer, 240V (P), 24V (S) 25VA

Switch, Rotary and Mounting Adapter

Block, Contact

44696

44697

45644

Breaker, Circuit 240V 1A

48455

61602

62044

50794

47321

60542

60679

36451

Ignitor, Single Rod

Ignition, Spark Module 24VAC 50/60 Hz

Switch, Air .08″ WC

Relay, 240VAC 2P1S

Control, Combo 4-20MA, Burst

Controller, Digital w/o Dip Switch

Valve, Gas PS528

Fan, Cooling 230VAC 295 CFM

62282

59002

62106

Ignition Cable, 25″

Inshot Burner

Main Blower

Figure 4-36.

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SECTION 5

TROUBLESHOOTING

SECTION 5

TROUBLESHOOTING

PROBLEM:

OVEN BLOWER AND CONVEYOR OPERATE,

YET THE OVEN IS NOT HEATING

PRODUCTS ARE OVERCOOKED

OR UNDERCOOKED

Reset the temperature controller

to a new setting (above 200°F),

after turning the BLOWER switch

to off for 30 seconds.

Check for correct

setting on tempera-

ture controller.

Check for correct

setting of conveyor

speed control.

Turn temperature

control to correct

setting.

Start the oven again. If the oven still does not

heat, call your Middleby Marshall Service Agency.

Set the conveyor speed

control at correct setting.

Verify the food prepa-

PROBLEM:

ration process.

CONVEYOR WILL NOT HOLD PROPER SPEED

OR WILL NOT RUN AT ALL

If products still cook incorrectly,

call your Middleby Marshall Ser-

vice Agency.

Check whether the conveyor is

jammed on something in oven.

PROBLEM:

OVEN DOES NOT HEAT

Check for proper tension of conveyor drive

chain and conveyor belt. Refer to Section 4 for

correct procedure.

Check to see if both BLOWER

switch and HEAT switch are in

the “ON” or “I” position.

Check that the conveyor

drive sprocket is tight.

If oven does not heat, call your

Middleby Marshall Service Agency.

If conveyor still does not run correctly, contact

your Middleby Marshall Service Agency.

PROBLEM:

BLOWER MOTOR IS RUNNING, YET LITTLE

OR NO AIR BLOWS FROM AIR FINGERS

PROBLEM:

OVEN DOES NOT TURN ON WHEN ITS

SWITCHES ARE TURNED ON

Air ﬁngers reassembled incorrectly,

Check that all electric supply switches are set to

the “ON” or “I” position. Then, start the oven.

after cleaning.

Assemble air ﬁngers correctly, after cleaning.

Refer to Section 4 procedure, or call your

Middleby Marshall Service Agency.

If oven still will not start, contact your Middleby

Marshall Service Agency.

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SECTION 5

TROUBLESHOOTING

NOTES

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SECTION 6

ELECTRICAL SCHEMATICS

SECTION 6

ELECTRICAL SCHEMATICS

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WARNING

Improper installation, adjustment, alteration, service or maintenance

can cause property damage, injury or death. Read the installation,

operating and maintenance instructions thoroughly before

installing or servicing this equipment.

NOTICE

During the warranty period, ALL parts replacement and servicing should be performed

by your Middleby Marshall Authorized Service Agent. Service that is performed by par-

ties other than your Middleby Marshall Authorized Service Agent may void your war-

ranty.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts re-

lieves the manufacturer of all warranty and liability.

NOTICE

Middleby Marshall reserves the right to change speciﬁcations at any time.

Middleby is proud to support the Commercial Food Equipment

Service Association (CFESA). We recognize and applaud

CFESA's ongoing efforts to improve the quality of technical

service in the industry.

MiddlebyCookingSystemsGroup•1400ToastmasterDrive•Elgin, IL60120•USA•(847)741-3300•FAX(847)741-4406

www.middleby.com

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