Duke DC-DLTB-M Service Manual
TACO BELL
O
ON
OFF
DUAL-LINE
COUNTER
Service Manual
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 qualied 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 qualied Duke trained service technician.
This manual is copyright ©2011 Duke Manufacturing Company. All rights reserved. Reproduction without
written permission is prohibited. Duke is a registered trademark of the Duke Manufacturing Company.
Duke Manufacturing Company
2305 N. Broadway • St. Louis, MO 63102
800.735.3853 • 314.231.1130
Fax: 314-231-5074
www.dukemfg.com
P/N 219209B
Service Manual for Taco Bell Dual-Line Counters
IMPORTANT WARNING AND SAFETY INFORMATION
WARNING
READ THIS MANUAL THOROUGHLY BEFORE OPERATING, INSTALLING, OR
PERFORMING MAINTENANCE ON THE EQUIPMENT.
WARNING
FAILURE TO FOLLOW INSTRUCTIONS IN THIS MANUAL CAN CAUSE PROPERTY
DAMAGE, INJURY OR DEATH.
WARNING
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS OR
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
WARNING
DO NOT OPERATE THIS EQUIPMENT WITHOUT PROPERLY PLACING AND
SECURING ALL COVER AND ACCESS PANELS.
CAUTION
Observe the following:
• Provide and maintain adequate minimum clearances from all walls and combustible materials.
• Provide and maintain adequate clearance for air openings.
• Keep the equipment area free and clear of combustible material.
• Operate equipment only on the type of electricity indicated on the specication plate.
• Retain this manual for future reference.
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Service Manual for Taco Bell Dual-Line Counters
TABLE OF CONTENTS
TACO BELL DUAL-LINE COUNTER SPECIFICATIONS ..................................................4
INSTALLATION .................................................................................................................4
Location .......................................................................................................................4
Leveling .......................................................................................................................4
Stabilizing ....................................................................................................................4
Electrical Connection ................................................................................................... 4
PARTS REMOVAL AND REPLACEMENT PROCEDURES ..............................................5
DRY CHANNEL FOOD WARMERS ............................................................................5
Display Control Panel ............................................................................................ 5
Relay Box ..............................................................................................................5
Dry Channel Power ON/OFF Switch .....................................................................5
Solid State Relay (SSR) .......................................................................................6
Transformer .......................................................................................................... 6
Channel Assembly .................................................................................................6
TORTILLA GRILL AND TACO TOWER POWER ON/OFF SWITCHES ......................7
TRI-CHANNEL COLD PAN .........................................................................................7
Evaporator ............................................................................................................. 8
Tri-Channel Thermostat .........................................................................................8
Tri-Channel Compressor Assembly .......................................................................8
REFRIGERATED BASE UNIT (RBC) ..........................................................................9
Evaporator Fan Assembly ......................................................................................9
RBC Thermostat ..................................................................................................10
RBC Refrigeration System ................................................................................... 11
RBC Door Gaskets .............................................................................................. 11
RBC Door Adjustment .......................................................................................... 11
LOAD CENTER .........................................................................................................12
Circuit Breaker Replacement .....................................................................................12
RECHARGING REFRIGERATION SYSTEM ..................................................................13
TOOLS.......................................................................................................................13
Duke Service Bulletin Number 26 – Refrigeration System Evacuation .....................13
Duke Service Bulletin Number 35 – Accessing Sealed Refrigeration Systems .........13
SERVICE INFORMATION ...............................................................................................14
MAINTENANCE ........................................................................................................14
Stainless Steel Care and Cleaning ......................................................................14
Compressor Air Filter Care ..................................................................................14
TROUBLESHOOTING GUIDE ........................................................................................16
SCHEMATICS .................................................................................................................18
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Service Manual for Taco Bell Dual-Line Counters
TACO BELL DUAL-LINE COUNTER SPECIFICATIONS
MODEL DESCRIPTION VOLTAGE / WATTS
DC-DLTB-M Counter, Dual-Line 157-1 120/208-240vac / 3798
INSTALLATION
LOCATION
The Dual-Line unit is intended for indoor use only.
Be sure the chosen location has a oor strong
enough to support the total weight of the unit fully
loaded with food product. Reinforce the oor, if
necessary, to provide for maximum loading. For
the most efcient operation, be sure to provide
good air circulation.
LEVELING
Be sure the unit is placed on a rm, at surface/
oor. Check for cracks in ooring or tile and avoid
these areas if possible. If necessary, place support
pads, properly rated for the weight of the unit, to
“bridge” uneven or cracked ooring. Level the unit
accordingly using the leg adjusters.
STABILIZING
Use the leg adjustments to ensure that the unit
is solid to the oor surface at all contact points.
Ensure that the unit does not “rock” when pressure
is applied to the top corners.
ELECTRICAL CONNECTION
The Dual-Line unit requires Direct wiring
Dual-Line unit to the power supply must be
performed by a certied electrician and must
comply with local electrical codes for your
municipality.
WARNING
REFER TO THE AMPERAGE DATA
LIST IN THE SPECIFICATIONS
OR THE SERIAL TAG DATA AND
YOUR LOCAL CODE OR THE
NATIONAL ELECTRICAL CODE TO
BE SURE UNIT IS CONNECTED TO
THE PROPER POWER SOURCE.
A PROTECTED CIRCUIT OF THE
CORRECT VOLTAGE AND AMPERAGE
MUST BE RUN FOR CONNECTION
OF THE SUPPLY CORD OR
PERMANENT CONNECTION TO
THE UNIT. THE POWER MUST BE
TURNED OFF AND DISCONNECTED
WHENEVER PERFORMING
MAINTENANCE OR REPAIR
FUNCTIONS.
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Service Manual for Taco Bell Dual-Line Counters
Main Power
On/Off Switch
I
PARTS REMOVAL AND REPLACEMENT PROCEDURES
DRY CHANNEL FOOD WARMERS
Display Control Panel
The Dual-Line unit is equipped with two Dry
Channel units, one on each side of the DualLine. Each Dry Channel unit has its own Display
Control Panel.
Figure 1. Dry Channel Display
1. Place the Main Power ON/OFF switch in the
OFF position.
2. Disconnect the Dual-Line unit from its power
source.
3. Remove the four screws securing the Display
Control Panel and move Display Control Panel
away from mounting surface.
4. If the Display Control Panel is to be completely
removed, label and disconnect wires.
Relay Box
Each Dry Channel unit is equipped with its own
Relay Box. The Relay Box is located under the
unit. Each Relay Box has an ON/OFF switch.
Figure 2. Relay Box Location
1. Place the Main Power ON/OFF Switch in the
OFF position. Use proper Lockout/Tagout
procedures.
2. Remove the four screws securing the Relay
Box the bottom of the Dry Channel Unit.
3. If complete Relay Box is to be replaced, label
and disconnect wires.
4. Remove the Relay Box.
5. If components in the Relay Box are to be
removed, remove the Relay Box cover.
6. Reverse procedure to assemble and install
Relay Box.
Note: The following component removal is based
on the cover having been already removed.
5. Remove Display Control Panel.
6. Reverse this procedure to install Display
Control Panel.
Dry Channel Power ON/OFF Switch
1. Tag and disconnect the Relay Box ON/OFF
Switch wires.
2. Slide the Relay Box ON/OFF Switch out
through front of switch mount.
3. Reverse procedure to install a new Main Power
ON/OFF Switch.
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Service Manual for Taco Bell Dual-Line Counters
Figure 3. Exploded View of
Relay Box Internal Components
Transformer
Solid State Relay (SSR)
Figure 4. Solid State Relays (SSR)
1. Tag and disconnect wires from the SSR to be
replaced.
2. Remove the two screws attaching the SSR
and remove the SSR.
Figure 5. 240/208 Step Down Transformer
1. Tag and disconnect wires from Transformer.
2. Remove the four nuts attaching the Transformer
and remove the Transformer.
3. Reverse procedure to install new Transformer.
CHANNEL ASSEMBLY
The Heat Elements, Temperature Probes and
RTDs are embedded in a foil wrap that is attached
to the bottom of each Channel Assembly. These
parts are not serviced in the eld. The entire
Channel Assembly must be replaced in the event
of a failure of any of these parts.
3. Reverse procedure to install a new SSR.
6
Figure 6. Dry Channel Tub Assembly
Service Manual for Taco Bell Dual-Line Counters
1. Place the Main Power ON/OFF Switch in the
OFF position. Use proper Lockout/Tagout
procedures.
2. Check that the Dual-Line is disconnected from
power source.
3. Remove six screws (three on each side)
attaching the channel top frame to tub.
4. Carefully lift the Channel Assembly out, taking
care not to damage wire connections.
5. Label and disconnect wires from foil wrap on
the Channel Assembly to the Control Board.
6.
Using an ohmmeter test the resistance across
the entire heating element. It should read
approximately 248 ohms. Also test the RTD
circuit; its normal reading is approximately 1,000
ohms. Replace the Channel Assembly if either
the heater circuit or RTD circuit are reading out
of tolerance.
7. Reverse this procedure to install the new Dry
Channel Assembly. For end channels use part
number 171263SED. Replace center channels
with part number 171262SED.
8. Return the Dual-Line unit to service and check
for proper operation.
TORTILLA GRILL AND TACO TOWER
POWER ON/OFF SWITCHES
The Tortilla Grill and Taco Tower ON/OFF Switches
are located on one side of the Dry Channel Warmer
next to the Dry Channel Display.
1. Place the Main Power ON/OFF Switch in the
OFF position. Use proper Lockout/Tagout
procedures.
2. Remove the screws securing the switch
plate.
3. Remove protective cover, if present, from the
back of the switches.
4. Tag and disconnect the wires from the suspect
switch.
5. Using an ohmmeter check the switch for
continuity. It should read 0 ohms in the ON
position and a very high reading in the OFF
position. Replace the switch if it fails the
continuity tests.
6. Remove two screws on front of control panel
to remove faulty switch.
7. Replace existing switch with properly rated
switch.
8. Refer to tags and reconnect wires.
9. Install protective cover.
10. Mount switch to mounting plate.
11. Reattach mounting plate to unit.
Figure 7. Location of Power ON/OFF switches
1: Tortilla Grill
2: Taco Tower Infrared Heaters and Lights
12. Restore Dual-Line to service and check for
proper switch operation.
TRI-CHANNEL COLD PAN
Figure 8. Tri-Channel Cold Pan Unit
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