Middleby PS528E Service Manual

A MIDDLEBY COMPANY

owner's
operating

& installation

manual

PS528-Series Electric Ovens: English

PS528-Series

Model

PS528E

OVENS

PS528 (Single)

PS528 (Double)

©2014 Middleby Marshall Inc.

PS528 (Triple)

Part No. 63934 Rev

D Price $30.00

P: 11/14

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.
It is suggested to obtain a service contract with a Middleby Marshall Authorized Service Agent.

WARNING

FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS

AND 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, operation, and

maintenance instructions thoroughly before installing or servicing this equipment.

IMPORTANT

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

IMPORTANT

It is the customer’s responsibility to report any concealed or non-concealed damage to the freight company.

Retain all shipping materials until it is certain that the equipment has not suffered concealed shipping damage.

NOTICE

Contact your Middleby Marshall Authorized Service Agent to perform maintenance and repairs. An Authorized

Service Agency Directory is supplied with your oven.

NOTICE

Using any parts other than genuine Middleby Marshall factory manufactured parts relieves the

manufacturer of all warranty and liability.

NOTICE

Middleby Marshall (Manufacturer) reserves the right to change specications at any time.

NOTICE

The equipment warranty is not valid unless the oven is installed, started and

demonstrated under the supervision of a factory certied installer.

NOTICE

A Middleby Marshall certied installer must be used to install and service this appliance.

NOTICE

This equipment is only for professional use and shall be used by qualied personnel.

CAUTION

In order to avoid a hazard due to inadvertent resetting of the thermal cut-out,

this appliance must not be supplied through an external switching device, such as a timer,

or connected to a circuit that is regularly switched on and off by the utility.

i) This appliance is not Intended for use by persons (including children) with reduced physical, sensory or

mental capabilities, or lack of experience and knowledge, unless they have been given supervision or

instruction concerning use of the appliance by a person responsible for their safety.
ii) Children should be supervised to ensure that they do not play with the appliance.
iii) Cleaning and user maintenance shall not be made by children without supervision

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

RETAIN THIS MANUAL FOR FUTURE REFERENCE.

www.middleby-marshall.com

ii

Model No.
Modéle No.

Serial No.
Serié No.

Installation Date
Date d'installation

MIDDLEBY MARSHALL

No Qu i b b l e li m i t e d Wa r r a N t y

(U.S.A. O

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
IN STAL LATI ON, OR 18 MO NTH S FRO M DATE OF
PURCHASE, WHICHEVER IS EARLIER, PROVIDED THAT
TERMS OF PAYMENT HAVE BEEN FULLY MET.

This warranty is valid only if the equipment is installed,
started, and demonstrated under the supervision of a factory­authorized installer.

Normal maintenance functions, including lubrication,
cleaning, or customer abuse, are not covered by this no
quibble warranty.

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.

The foregoing warranty is exclusive and in lieu of all
other warranties, expressed or implied. There are no

implied warranties of merchantability or of tness for a

particular purpose.

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

prots of Buyer.

Th is warrant y is effe cti ve on Mid dle by Mars hal l
equipment sold on, or after, February 15, 1995.

n l y )

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’s obligation under this warranty shall be limited to replacing or
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.

This warranty is not valid unless equipment is installed,
started, and demonstrated under the supervision of a factory­authorized installer.

Normal maintenance functions, including lubrication, adjustment of

airow, thermostats, door mechanisms, microswitches, burners and

pilot burners, and replacement of light bulbs, fuses and indicating
lights, are not covered by warranty.

Any repairs or replacements of defective parts shall be performed by
Seller’s authorized service personnel. Seller shall not be responsible
for any costs incurred if the work is performed by other than Seller’s
authorized service personnel.

When returning any part under warranty, the part must be intact and
complete, without evidence of misuse or abuse, freight prepaid.

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 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 prots 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.

The foregoing shall be Seller’s sole and exclusive obligation and
Buyer’s sole and exclusive remedy for any action, whether in breach
of contract or negligence. In no event shall seller be liable for a sum
in excess of the purchase price of the item.

© 2014 - Middleby Marshall, A Middleby Company.

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. • [phone] • FAX: [phone]

iii

TABLE OF CONTENTS

SECTION 1

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

SERIES PS528 ELECTRICAL SPECIFICATIONS ..............2

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

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

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

C. Electric Heaters .........................................................4

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

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

SECTION 2

I. UNLOADING ....................................................................7

PS528 OVEN INSTALLATION

REQUIRED KITS AND EQUIPMENT ...........................8

PARTS LIST FOR SERIES PS528 ELECTRIC OVEN

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

UTILITY ROUGH-IN DIMENSIONS AND POSITIONING

FOR PS528-SERIES OVENS .....................................12

CIRCUIT BREAKER .......................................................12

ELECTRICAL SPECIFICATIONS ...................................12

ELECTRICAL RATING ...................................................12

SUPPLY WIRE ................................................................12

SUGGESTED ..................................................................12

II. VENTILATION GUIDELINES ........................................12

III. ELECTRICAL CONNECTION INFORMATION FOR

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

IV. ELECTRIC SUPPLY FOR ELECTRIC-HEATED

OVENS .......................................................................12

SECTION 3 INSTALLATION

I. CONTROL FUNCTIONS .................................................15

II. COMPONENT INFORMATION AND LOCATION .........16

A. Door Safety Switch ..................................................16

B. Blower Switch ..........................................................16

C. Heat Switch ..............................................................16

D. Temperature Controller ............................................16

E. Conveyor .................................................................17

MEASURING CONVEYOR SPEED. ..............................17

III. STEP-BY-STEP OPERATION ......................................18

A. Startup Procedures ..................................................18

Daily Startup ..................................................................18

Power Failure .................................................................18

B. Shutdown Procedure ..............................................18

Page

TABLE OF CONTENTS

(Continued)

Page

IV. NORMAL OPERATION - STEP-BY-STEP ...................... 20

A.Daily Startup Procedure ............................................ 20

B. Daily Shutdown Procedure ..................................... 20

V. QUICK REFERENCE: TROUBLESHOOTING .............. 22

SECTION 4 MAINTENANCE

I. MAINTENANCE - DAILY ............................................. 24

A. Exterior ...................................................................... 24

B. Cooling Fan ............................................................... 24

C. Conveyor Belt ........................................................ 24

D. Crumb Pans ............................................................ 24

II. MAINTENANCE - MONTHLY ....................................... 25

A. Removing Conveyor From Oven For Cleaning .... 25

B. Air Fingers Disassembly For Cleaning .................. 27

C. Reassembly of Air Fingers ...................................... 28

D. Reinstall End Plugs ................................................. 31

E. Conveyor Reassembly Into Oven ........................... 32

F. Checking Conveyor Belt Tension............................ 32

G. Conveyor Belt Link Removal .................................. 33

H. Attaching Drive Chain ............................................. 34

III. MAINTENANCE - EVERY 3 MONTHS ......................... 35

A. Electrical Terminals ................................................. 35

B. Ventilation ................................................................. 35

IV. MAINTENANCE - EVERY 6 MONTHS ......................... 35

PS528-SERIES ELECTRIC OVEN KEY SPARE

PARTS ...................................................................... 36

KEY SPARE PARTS KIT ................................................ 36

SECTION 5 TROUBLESHOOTING

Troubleshooting Charts ...................................................... 37

SECTION 6 - PARTS LIST

SINGLE OVEN EXPLODED VIEW .................................... 41

RELAY PANEL ................................................................... 43

BLOWER ASSEMBLY ....................................................... 45

CONTROL PANEL ............................................................. 47

SINGLE CONVEYOR ......................................................... 49

SECTION 7 ELECTRICAL SCHEMATICS

Wiring Diagram, E208-240V 50/60/1, PS528 ................... 51

Wiring Diagram, E208-240V 50/60/3, PS528 ................... 52

Wiring Diagram, E380-480V 50/60/3, PS528 ................... 53

Wiring Diagram, E380V 50/60/3, CE PS528 ..................... 54

iv

NOTE

Wiring Diagrams are in Section 7 of this Manual.

The diagram for each oven is also on the lower

inner surface of its Control Console.

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.

A single PS528-Series Oven (Figure 1-1) is
mounted on a 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.

On a double or triple oven, the ovens operate
independently. All ovens use identical controls
and components. One oven can be cleaned or
serviced, while the others are operating.

SECTION 1

DESCRIPTION

Figure 1-1. Single PS528 Oven

Figure 1-2. Double PS528 Oven

Figure 1-3. Triple PS528 Oven

1

SECTION 1
DESCRIPTION

PS528 SERIES OVEN SPECIFICATIONS

Conveyor Belt Width 18.00" (457mm)

Heating Zone Length 28.00" (711mm)

Baking Area Square Feet 3.5 sq. ft. (0.33 sq. m.)

Overall Dimension

Standard Single Oven w/Legs 50.00" (1270mm) L ×

Overall Dimension

Double Oven 50.00" (1270mm) L ×

Overall Dimension

Triple Oven 50.00" (1270mm) L x

Weight of Single Oven 250 lb (93.3kg)

Shipping Weight 325 lb (121.3kg)

Shipping Cube 22.1 ft

Operating Range 12 kW/hr (3 ph)/10kW/hr (1ph)

Maximum Operating Temperature 600°F (316°C)

Warm-up Time 20 min.

Belt Speed Limits 1-10 minutes

40.75" (1035mm) W ×

21.72" (786mm) H ×

40.75" (1035mm) W ×

37.27" (947mm) H x

40.75" (1035mm) W ×

52.82" (1342mm) H ×

3

(0.62 m3)

SERIES PS1828 ELECTRICAL SPECIFICATIONS

Main Blower & Control Circuit Phase Frequency kW Amperage Poles Wires

Elements Voltage Voltage Draw L1 L2 L3 N

208-240V 208-240 3 Ph 50/60 Hz 208 12 35.3 35.3 33.3 - 3 Pole 4 Wire

(ETL Listed)

380V Export 208-240V 3 Ph 50/60 Hz 380 12 20.2 18.2 18.2 2.0 3 Pole 4 Wire

(CE Listed)

480V 208-240V 3 Ph 50/60 Hz 480 12 16.4 14.4 14.4 2.0 3 Pole 4 Wire

(ETL Listed)

208-240V 208-240 1 Ph 50/60 Hz 208 10 48.1 48.1 2 Pole 3 Wire

3 Ph 50/60 Hz 240 12 30.8 30.8 28.8 - 3 Pole 4 Wire

1 Ph 50/60 Hz 230 9.2 40.0 40.0 2 Pole 3 Wire

1 Ph 50/60 Hz 240 10 41.7 41.7 2 Pole 3 Wire

(3 hot, 1 grd)

(3 hot, 1 grd)

(3 hot, 1neut, 1 grd)

(3 hot, 1neut, 1 grd)

(2 hot, 1 grd)

(2 hot, 1 grd)

(2 hot, 1 grd)

NOTE

Wiring Diagrams are contained in Section 7 of this Manual

and are also located inside the oven at the

bottom of the Control Panel

This Manual Must Be Kept For Future Reference

2

SECTION 1

DESCRIPTION

Figure 1-4. PS528-Series Oven Components Locations

3

SECTION 1
DESCRIPTION

II. COMPONENT FUNCTION (Figure 1-4)

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 ngers. The BLOWER switch must be set

to “ON” or “I” for oven warmup and baking.

C. Electric Heaters

Blower Assembly

There is one heater element mounted on
the inside of the rear panel. The element is
connected to an electrical control which is
energized by the temperature controller.

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
covering 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

4

SECTION 1

DESCRIPTION

Figure 1-6. Cooling Fan

5

SECTION 1
DESCRIPTION

F2. Blank Plates

1. Blank Plates- The Blank Plates are available

to install on the plenum where an air nger is

not required.

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

6

SECTION 2

INSTALLATION

SECTION 2

INSTALLATION

NOTE: The oven, when installed, must be electrically
grounded in accordance with local codes, or in the absence
of local codes, with the National Electrical Code (NEC),
or ANSI/NFPA70.

NOTE

There must be adequate clearance between
the oven and any adjacent combustible con­struction. Clearance must also be provided
for servicing and for operation.

CAUTION

It is recommended that the oven be placed under
a ventilation hood for adequate air supply and
ventilation.

CAUTION

Do not obstruct the ow of ventilation air to and

from your oven. Do not obstruct the fan holes in
the rear of the unit.

CAUTION

On ovens with the Machinery Drive Compartment
located at the right end, a minimum clearance of
0″ to a left side wall, 18″ to a right side wall and
6″ from a back wall to air openings at the rear
of the oven must be maintained.

I. UNLOADING

Your Middleby Marshall PS528-Series Oven is shipped
partially assembled. It will arrive in a carton on a crate.

The crate and carton must be examined before signing the
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 le a

claim against the carrier. Surface Interstate Commerce
Regulations (U.S.A.) require that the claim must be
initiated by the consignee within 10 days from the date
that the shipment is received.

For servicing and cleaning, a minimum of 18″
clearance from all walls is recommended.

7

SECTION 2
INSTALLATION

PARTS LIST FOR SERIES PS528 ELECTRIC OVEN

INSTALLATION KIT

Single and Double Stack Ovens

P/N 63938

ITEM

NO. QTY PART NO. DESCRIPTION
1 4 3101908 LEG 4″ AD FT

2 1 62208 INSULATION BOTTOM TRAY
3 1 62206 BOTTOM TRAY WELDMENT
4 1 61650 TOP COVER

5 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8

6 1 63934 OWNER'S OPERATING & INSTALLATION MANUAL

7 4 62207 INSULATION

PARTS LIST FOR SERIES PS528 ELECTRIC OVEN

INSTALLATION KIT

Triple Stack Oven

P/N 63939

ITEM

NO. QTY PART NO. DESCRIPTION
1 2 62208 INSULATION BOTTOM TRAY

2 1 62206 BOTTOM TRAY WELDMENT
3 1 61650 TOP COVER

4 4 51387 SCREW MSSLT THREAD 8-32 × 1/2, 18-8

5 4 M3828 PIN, ALIGNMENT

6 1 63934 OWNER'S OPERATING & INSTALLATION MANUAL

7 4 62207 INSULATION

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

8

SECTION 2

INSTALLATION

Figure 2-5. MODEL PS528 SINGLE OVEN DIMENSIONS

1

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

1

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

9

SECTION 2
INSTALLATION

1

Figure 2-6. MODEL PS528 DOUBLE OVEN DIMENSIONS

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

1

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

10

SECTION 2

INSTALLATION

Figure 2-7. MODEL 528 TRIPLE OVEN DIMENSIONS

1

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

1

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

11

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

Separate circuit breaker with lockout/tagout electrical
shutoff for each oven. Wire each oven separately.

60 Amp circuit breaker for 208-240V 1ph, 50 Amp circuit
breaker for 208-240V 3ph, or 30 Amp circuit breaker for
380-480V.

ELECTRICAL SPECIFICATIONS

Bl o w e r /
el e m e n t

P

h a s e 3 3 3 3 1 1 1

Ci r C u i t 208/240 208/240 208/240 208/240 208/240 208/240 208/240

kW 12 12 12 12 10 9.2 10

Fr e q u e n C y 50/60 50/60 50/60 50/60 50/60 50/60 50/60

Po l e s 3 4 4 4 2 2 2

wi r e s 4 5 5 5 3 3 2

L1 35.3 30.8 20.2 16.4 48.1 40.0 41.7

L2 35.3 30.8 18.2 14.4 48.1 40.0 41.7

L3 33.3 28.8 18.2 14.4 - - -

208V 240V 380V 480V 280V 230V 240V

N - - 2.0 2.0 - - -

SUPPLY WIRE

Supply wire size must be in accordance with the National
Electrical Code (current edition) and must be in compli­ance with local codes.

SUGGESTED

If space permits, service should be located near the
control console end of the oven(s) to allow convenient
access to safety switches.

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

Installation

CAUTION

UNIT MUST HAVE AIR VENT PLATES

INSTALLED OR WARRANTY WILL BE VOID.

II. VENTILATION GUIDELINES

A mechanically driven ventilation system is recommended for
the PS528 Series Middleby Marshall conveyorized electric
ovens.

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 remember
these are recommendations or guidelines, you may have a
special condition or problem that will require the services of
a ventilation engineer or specialist. Proper ventilation is the
oven owner’s responsibility. Improper ventilation can inhibit
oven performance.

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

that must be installed in the eld (See Section 6: PARTS
LIST, page 44-45 for reference, Item 5).

GROUNDING CONNECTION

There is an equipotentiality ground located near the incoming
terminal blck. This is for an external equipotentialityground
cable.

12

SECTION 2

INSTALLATION

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.

If you have any questions about how to mount these two
‘C’ Channel brackets, kindly phone Middleby Technical

Services at 847-741-3300. Press 3, then 5 for Technical
Support.

III. ELECTRICAL CONNECTION INFORMATION

FOR PS528-SERIES OVENS.

WARNING

Authorized supplier personnel normally accom­plish the connections for the ventilation system,
electric supply, as arranged by the customer.
Following these connections, the factory-autho­rized installer can perform the initial startup of
the oven.

Check the oven data plate (Figure 2-10) before making any
electric supply connections. Electric supply connections
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 regulations.

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/ circuit breaker have lockout/tagout capability. The
electric supply connection must meet all national and local
electrical code requirements. Copper is the recommended
material for the electrical supply conductors.

IV. ELECTRIC SUPPLY FOR

ELECTRICALLY HEATED OVENS

Power requirements for electrically heated ovens are
usually 208 - 240VAC, 1-phase, 3-wire (2 ‘hot’, 1 ground)
or 208-240VAC, 3-phase, 4-wire (3 ‘hot’, 1 ground),
although ovens built for export can have power require­ments of 380VAC and 480VAC. (These ovens have a
4-wire system.) A 1.5″ (38mm) diameter cutout/hole in
the back of the machinery compartment provides ac­cess for the electrical supply connections on 380V and
480V units. 208V and 240V 3-phase units have a cord

and plug. Using exible cable(s) for the electrical power

supply conductors requires a 2″ (51mm) strain-relief t-
ting (not furnished) to enable safe access to the terminal
block from which oven power is distributed.

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 specications).

The electric current rating for each conductor supplying
a PS528-Series Oven ranges from a minimum of 16.4
amperes to a maximum of 48.1 amperes.

Typical specications for each PS528-Series Oven are

208V or 240V, 1-phase, 3-wire, 10kW; this oven requires
60-ampere service. A PS528-Series Double Oven
(Figure 1-2) installation would require two 60-ampere
service connections, one for each oven; the 10kW power
consumption also doubles for such an installation to
20kW.

The 208V or 240VAC electrically heated oven uses two
legs of the supplied power to provide 208V or 240VAC
power for the oven control circuitry.

Figure 2-11. Junction Connection BoxFigure 2-10. Typical Electric Oven Data Plate

13

SECTION 2
INSTALLATION

NOTES

14