Duke TSC-6-18, TSC 3-9 Service Manual

PROOFER OVEN WITH
TOUCH SCREEN
CONTROLS (TSC)

MODELS

TSC-6/18

Service Manual

B

AKI

N

G CENTER

Please read this manual completely before attempting to install,

operate or service this equipment.

This document is prepared for trained Duke service technicians. It is not to be used by anyone not properly qualied
to perform these procedures.

This Service Manual is not all encompassing. If you have not been trained on servicing this product, be sure to
read the manual completely before attempting servicing. Be sure all necessary tools, test equipment, and skills are
available. Those procedures for which you do not have the proper skills and test equipment must be performed only
by a qualied Duke trained service technician.

This manual is Copyright © 2010 Duke Manufacturing Co. All rights reserved.

Reproduction without written permission is prohibited. Duke is a registered

trademark of the Duke Manufacturing Co.

Duke Manufacturing Co.

2305 N. Broadway

St. Louis, MO 63102

Phone: [phone]

Toll Free: 1-800-735-3853

Fax: [phone]

www.dukemfg.com

P/N 512452B

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

IMPORTANT WARNING AND SAFETY INFORMATION

THIS MANUAL HAS BEEN PREPARED FOR PERSONNEL QUALIFIED TO INSTALL ELECTRICAL

EQUIPMENT, WHO SHOULD PERFORM THE INITIAL FIELD STARTUP AND ADJUSTMENTS OF THE

EQUIPMENT COVERED BY THIS MANUAL.

READ THIS MANUAL THOROUGHLY BEFORE OPERATING, INSTALLING OR PERFORMING

MAINTENANCE ON THE EQUIPMENT.

FAILURE TO FOLLOW ALL THE INSTRUCTIONS IN THIS MANUAL CAN CAUSE

PROPERTY DAMAGE, INJURY OR DEATH.

IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE

CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

ELECTRICAL CONNECTIONS SHOULD BE PERFORMED ONLY BY A CERTIFIED

PROFESSIONAL.

ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH THE
APPLICABLE PORTIONS OF THE NATIONAL ELECTRIC CODE AND/OR ALL LOCAL ELECTRIC CODES.
FAILURE TO COMPLY WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR
DEATH.

BEFORE CONNECTING THE UNIT TO THE ELECTRICAL SUPPLY, VERIFY THAT THE
ELECTRICAL AND GROUNDING CONNECTIONS COMPLY WITH THE APPLICABLE PORTIONS OF THE
NATIONAL ELECTRIC CODE AND/OR OTHER LOCAL ELECTRICAL CODES. FAILURE TO COMPLY
WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

BEFORE CONNECTING THE UNIT TO THE ELECTRICAL SUPPLY, VERIFY THAT THE
ELECTRICAL CONNECTION AGREES WITH THE SPECIFICATIONS ON THE DATA PLATE. FAILURE TO
COMPLY WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

UL73 GROUNDING INSTRUCTIONS: THIS APPLIANCE MUST BE CONNECTED TO A
GROUNDED, METAL, PERMANENT WIRING SYSTEM. OR AN EQUIPMENT-GROUNDING CONDUCTOR
MUST BE RUN WITH THE CIRCUIT CONDUCTORS AND CONNECTED TO THE EQUIPMENT­GROUNDING TERMINAL OR LEAD ON THE APPLIANCE. FAILURE TO COMPLY WITH THIS
PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

APPLIANCES EQUIPPED WITH A FLEXIBLE ELECTRIC SUPPLY CORD, ARE
PROVIDED WITH A THREE-PRONG GROUNDING PLUG. IT IS IMPERATIVE THAT THIS PLUG BE
CONNECTED INTO A PROPERLY GROUNDED THREE-PRONG RECEPTACLE. FAILURE TO COMPLY
WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

IF THE RECEPTACLE IS NOT THE PROPER GROUNDING TYPE, CONTACT AN

ELECTRICIAN. DO NOT REMOVE THE GROUNDING PRONG FROM THE PLUG. FAILURE TO COMPLY
WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

2

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

BEFORE PERFORMING ANY SERVICE THAT INVOLVES ELECTRICAL CONNECTION

OR DISCONNECTION AND/OR EXPOSURE TO ELECTRICAL COMPONENTS, ALWAYS PERFORM THE
ELECTRICAL LOCKOUT/TAGOUT PROCEDURE. DISCONNECT ALL CIRCUITS. FAILURE TO COMPLY
WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

BEFORE REMOVING ANY SHEET METAL PANELS OR SERVICING THIS EQUIPMENT,

ALWAYS PERFORM THE ELECTRICAL LOCKOUT/TAGOUT PROCEDURE. BE SURE ALL CIRCUITS ARE
DISCONNECTED. FAILURE TO COMPLY WITH THIS PROCEDURE CAN CAUSE PROPERTY DAMAGE,
INJURY OR DEATH.

DO NOT OPERATE THIS EQUIPMENT WITHOUT PROPERLY PLACING AND

SECURING ALL COVERS AND ACCESS PANELS. FAILURE TO COMPLY WITH THIS PROCEDURE CAN
CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

DO NOT USE OR STORE GASOLINE OR OTHER FLAMMABLE VAPORS OR LIQUIDS

IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE. FAILURE TO COMPLY CAN CAUSE
PROPERTY DAMAGE, INJURY OR DEATH.

IN THE EVENT OF A POWER FAILURE, DO NOT ATTEMPT TO OPERATE THIS

APPLIANCE. FAILURE TO COMPLY CAN CAUSE PROPERTY DAMAGE, INJURY OR DEATH.

3

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

TABLE OF CONTENTS

INTRODUCTION ...................................................................................................................................................................................................5

INSTALLATION ............................................................................................................................................................................................5

OPERATION ..................................................................................................................................................................................................5

CLEANING ....................................................................................................................................................................................................5

SEQUENCE OF OPERATION ......................................................................................................................................................................5

TOOLS .... .......................................................................................................................................................................................................5

SPECIFICATIONS .........................................................................................................................................................................................5

REMOVAL AND REPLACEMENT OF COMPONENTS .....................................................................................................................................7

ELECTRICAL LOCKOUT/TAGOUT PROCEDURE ..................................................................................................................................7

COVERS AND PANELS ................................................................................................................................................................................7

Proofer Rear Panel .................................................................................................................................................................................7

Oven Rear Panels ...................................................................................................................................................................................8

Oven Fan Cage and Wire Harness Cover ..............................................................................................................................................9

Proofer Floor Panel ................................................................................................................................................................................9

Oven Ceiling Panel ..............................................................................................................................................................................10

Electrical Compartment Access Panel .................................................................................................................................................10

AC Power Access Panel ....................................................................................................................................................................... 11

AC INPUT VOLTAGE WIRING CONNECTIONS ....................................................................................................................................11

Electrical Compartment Components ..................................................................................................................................................12

Electrical Compartment Cooling Fan ..................................................................................................................................................12

Hi Limit Breaker ..................................................................................................................................................................................13

ON/OFF Circuit Breaker ......................................................................................................................................................................13

Touchpad Controller ............................................................................................................................................................................14

Oven Blower Relay ..............................................................................................................................................................................15

Proofer and Oven Light Transformers .................................................................................................................................................16

Oven Element Contactor ......................................................................................................................................................................16

Oven Door Safety Switch ....................................................................................................................................................................17

Beeper ..................................................................................................................................................................................................17

Proofer Lights Circuit Breaker .............................................................................................................................................................18

USB Port ..............................................................................................................................................................................................18

Proofer and Oven Halogen Lamps .......................................................................................................................................................18

Proofer Heat Elements .........................................................................................................................................................................19

Proofer Circulation Fan ........................................................................................................................................................................20

Water Injection Solenoid ......................................................................................................................................................................21

Humidity Sensor ..................................................................................................................................................................................22

Humidity PC Board..............................................................................................................................................................................23

OPTIMIST NOZZLE ....................................................................................................................................................................................23

OVEN HEAT ELEMENTS ..........................................................................................................................................................................24

OVEN BLOWER MOTOR ..........................................................................................................................................................................25

OVEN BLOWER MOTOR START CAPACITOR ......................................................................................................................................26

OVEN HIGH LIMIT THERMOSTAT .........................................................................................................................................................27

DOOR GASKET REPLACEMENT ............................................................................................................................................................27

ADJUSTMENTS ...................................................................................................................................................................................................28

DOOR GASKET COMPRESSION CHECK ...............................................................................................................................................28

PROOFER DOOR GASKET ADJUSTMENT .............................................................................................................................................28

OVEN AIR WASH DOOR ADJUSTMENT ................................................................................................................................................29

TOUCH SCREEN DISPLAY BRIGHTNESS ADJUSTMENT...................................................................................................................30

FIELD TEMPERATURE CALIBRATION PROCEDURE .........................................................................................................................31

MAINTENANCE ..................................................................................................................................................................................................32

STAINLESS STEEL CARE .........................................................................................................................................................................32

WATER FILTER REPLACEMENT .............................................................................................................................................................32

CLEANING THE OPTIMIST NOZZLE .....................................................................................................................................................34

TROUBLESHOOTING .........................................................................................................................................................................................35

ELECTRICAL SCHEMATIC ................................................................................................................................................................................37

TSC OVEN LINE SUPPLY WIRING ...................................................................................................................................................................38

CUSTOMER ASSISTANCE .................................................................................................................................................................................39

4

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

INTRODUCTION

INSTALLATION

For detailed installation instructions, refer to the Owner’s
Manual (512792).

OPERATION

For specic operating instructions, refer to the Owner’s
Manual (512792).

CLEANING

For specic instructions, refer to the Owner’s Manual
(512792).

SEQUENCE OF OPERATION

For specic instructions, refer to the Owner’s Manual
(512792).

SPECIFICATIONS

US and Foreign Patents Pending TSC Model

TOOLS

STANDARD

• Standard set of hand tools.

• Insulated Trim Pot Screwdriver

• VOM with AC current tester. (Any quality VOM
or DVM with a sensitivity of at least 20,000 Ohms
per Volt can be used.)

• A ladder or other appropriate item to stand on, if
servicing the top of the unit.

Shipping Weight: Carton Box: 637 lbs / 288 kg

Shipping Weight: Wooden Crate: 772 lbs / 350 kg

Electrical Specications

AC VOLTAGE HZ PHASE WATTS AMPERAGE

208 60 1 6650 32
208 60 3P 6650 32 1
240 50/60 1 7200 30
240 60 3P 7200 30 1

380 – 415 50 3N 7200 30 2

1: L1<15A, L2<15A, L3<25A 2: L1<15A, L2<15A, L3<15A, N=Common

Compliance Declaration

5

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

Dimensions

6

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

REMOVAL AND REPLACEMENT OF COMPONENTS

ELECTRICAL LOCKOUT/TAGOUT
PROCEDURE

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

The Electrical LOCKOUT/TAGOUT Procedure is used
to protect personnel working on an electrical appliance.
Before performing any maintenance or service that
requires exposure to electrical components, follow
these steps:

1. In electrical box, place appliance circuit breaker
into OFF position.

2. Place a lock or other device on electrical box cover
to prevent someone from placing circuit breaker
ON.

3. Place a tag on electrical box cover to indicate that
appliance has been disconnected for service and
power should not be restored until tag is removed
by maintenance personnel.

COVERS AND PANELS

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

CAUTION: Interior components and surfaces may

be hot if the unit has been in recent
use.

General Service Note: During its installation, this
unit is required it to be secured to the building
structure. There is also a Restraining Device
(a heavy, exible metal cable) that was installed
to prevent the unit from moving beyond a certain
distance in order to prevent damage to the electrical
conduit feeding it. Most service can be accomplished
without moving the unit from its mounted position.
However, if the unit is moved during service, then
these securing devices must be reinstalled for continued
protection against tip-over and to meet other compliance
regulations.

4. Disconnect appliance power cord from electrical
outlet.

5. Place a tag on the cord to indicate that unit has
been disconnected for service and power should
not be restored until tag is removed by maintenance
personnel.

Proofer Rear Panel

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

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Service Manual for Proofer Oven with Touch Screen Controls (TSC)

and Oven Light Fixture wiring harness. Right and Left
Panels provide access to the Oven Burner Element
connections and Element wiring harnesses.

Figure 1: Proofer – Rear Panel Removed

1. Place the unit’s Power Switch in its OFF position,
and follow the proper Lockout/Tagout procedures.

Figure 2: Oven – Right Side Panel Removed

2. Remove all of the self-tapping sheet metal screws
that secure the Rear Panel to the Proofer. Set aside
for reuse.

3. Remove the Rear Panel to gain access to the
components located at the rear of the Proofer.

1. Place the unit’s Power Switch in its OFF position,
and follow the proper Lockout/Tagout procedures.

2. Remove the screws securing the Center Panel.
Retain for reuse.

Oven Rear Panels

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

The oven section of the unit has three rear panels. The
Center Panel provides access to the Oven Light Fixtures

3. Remove the Center Panel to gain access to Light
Fixtures and wiring harness.

Note: The Center Panel side screws must be removed
when removing either of the side panels.

4. Remove the screws securing the Side Panels. Retain
for reuse.

5. Carefully remove the insulation to access to the
Oven Burner Element connections and Oven Burner
Element wiring harness. Retain the insulation for
reuse.

8

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

Oven Fan Cage and Wire Harness Cover

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

Proofer Floor Panel

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

Proofer

Circulating

Fan

Optimist

Assembly

Figure 3: Oven Fan Cage and

Wire Harness Cover

1. Place the unit’s Power Switch in its OFF position,
and follow the proper Lockout/Tagout procedures.

2. Remove the four screws securing the Oven Fan
Cage to top of the unit. Retain for reuse.

3. Remove the cage to gain access to the Oven Fan
Motor.

4. Remove the screws securing the Oven Fan Wire
Harness Cover to the top of the unit. Retain for
reuse.

5. Remove the Oven Fan Wire Harness Cover to gain
access to the wiring harness and connections.

Heat

Elements

Figure 4: View of Proofer Components

with Floor Panel Removed

1. Place the unit’s Power Switch in its OFF position,
and follow the proper Lockout/Tagout procedures.

2. Remove the screws securing the Proofer Floor
Panel.

3. Slide the panel out through the front of the unit
being careful not to damage the fan blades or
optimist nozzle.

Access to the Proofer Heater Elements, Opti Mist
Assembly, Proofer Circulating Fan is available with
the Proofer Floor Panel removed.

9

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

Oven Ceiling Panel

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

Electrical Compartment Access Panel

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

It is not necessary to move the unit to gain access
to the Electrical Component Compartment. It might
become necessary to remove the unit from the wall
if troubleshooting leads into other areas. Refer to
the specic component section of this manual when
replacing a component in the Electrical Compartment.

Figure 5: View of Oven Components

with Ceiling Panel Removed

1. Place the unit’s Power Switch in its OFF position,
and follow the proper Lockout/Tagout procedures.

2. Remove the Oven Racks

3. Remove the screws securing the panel. Retain
screws for reuse.

4. It may be necessary to pry the panel forward from
the front of the unit. Be careful not to damage the
fan blade when removing the panel.

Access to Oven Heating Elements, Fan Blade, Oven
RTD and Hi Limit Thermostat, is available with the
Oven Ceiling Panel removed.

Remove

Loosen

Figure 6: Electrical Compartment

Access Panel Screw Locations

1. Place the unit’s Power ON/OFF Switch in its OFF
position and follow the proper Lockout/Tagout
procedures.

2. Refer to the drawing and loosen the appropriate
screws.

3. Also, referring to the drawing remove the two
screws at the top of the Control Access Panel.

4. Pull the panel forward then pivot it downward.

10

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

CAUTION: DO NOT power on the unit while the

Control Panel is in the open position.

5. To troubleshoot for problems, use visual checks,
an Ohmmeter, the proper Schematic for the version
of the unit being serviced.

Transformers

Control

Access Panel

Oven

Blower

Relay

Touch Pad

Controller

Oven

Element

Contactor

Figure 7: Electrical Compartment Components

CAUTION: When closing the Control Panel, make

sure that wires do not become pinched
between the Control Panel and the
cabinet surfaces.

The AC Power Access Panel is located at the rear of
the unit. It may be necessary to move the unit to gain
access to this area. This unit makes use of a restraining
device to protect the power cable and water supply line.

L1

L2

L3

N

Figure 8: AC Access and Connect Block

with Cover Removed

1. Place the unit’s Power ON/OFF Switch in its OFF
position, and follow the proper Lockout/Tagout
procedures.

2. Remove the three screws securing the panel to the
unit to gain access to the AC Power Connect Block.

6. Reverse steps 2 through 4 to secure the Control
Access Panel.

AC Power Access Panel

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

AC INPUT VOLTAGE WIRING CONNECTIONS

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

11

Service Manual for Proofer Oven with Touch Screen Controls (TSC)

Electrical Compartment Components

WARNING

IF ALUMINUM AC SUPPLY WIRE IS
PRESENT, THE UNIT IS NOT PROPERLY
WIRED AND MUST BE TAKEN OUT OF

SERVICE UNTIL IT IS PROPERLY REWIRED

USING COPPER WIRE.

Figure 9: Possible Wiring Block Congurations

Note: Also refer to the TSC OVEN LINE SUPPLY
WIRING diagrams at the back of this manual.

1. Place the unit’s Power ON/OFF Switch in its OFF
position, and follow the proper Lockout/Tagout
procedures.

2. Remove the AC Connect Block Cover Plate.

3. Use a Voltmeter to check for the presence of voltage.

4. With AC power removed and proper Lockout and
Tagout procedures applied, ensure that the contacts
on the connect block are properly tightened.

A

C

B

Figure 10: Cooling Fan, Power On/Off

Switch and Hi Limit Thermostat

A: Cooling Fan

B: Power ON/OFF Switch

C: Hi Limit Thermostat

Electrical Compartment Cooling Fan

WARNING

BEFORE PERFORMING ANY SERVICE THAT

INVOLVES ELECTRICAL CONNECTION
OR DISCONNECTION AND/OR EXPOSURE
TO ELECTRICAL COMPONENTS, ALWAYS

FOLLOW THE ELECTRICAL LOCKOUT/

TAGOUT PROCEDURE. DISCONNECT ALL

CIRCUITS. FAILURE TO COMPLY CAN

CAUSE PROPERTY DAMAGE, INJURY OR

DEATH.

This fan is mounted on the electrical compartment on
the right side of the unit.

1. Place the unit’s Power ON/OFF Switch in its OFF
position, and follow the proper Lockout/Tagout
procedures.

2. Remove the two screws securing the Cooling Fan
panel to the electrical compartment.

12

3. Tag and disconnect the cooling fan wires.

4. Remove the four nuts securing the fan to the panel.
Retain the nuts for reuse.

5. Remove the fan.

6. Reverse this procedure to install the replacement
fan.