Wolf CW24 User manual

General Information 2
Controls & Operation 4
Component Access & Removal 8
Troubleshooting Guide 13
Technical Data 16
Wiring Diagrams 17
subzero.com 800.222.7820
CW24 Cup Warming Drawer
Service Manual

Page 2
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
General Information
1-2
#9001337 - Revision A - September, 2015
INTRODUCTION
This Technical Service Manual has been compiled to provide the most recent technical service information. This
information will enable the service technician to troubleshoot and diagnose malfunctions, perform necessary repairs
and return the appliance to proper operational condition.
The service technician should read the complete instructions contained in this service manual before initiating any
repairs on a Wolf Appliance.
For installation information see Cup Warming Drawers Installation Guide available at http://www.subzero-
wolf.com/trade-resources/product-specifications.
For Use and Care information see Cup Warming Drawers Use & Care Guide available at http://www.subzero-
wolf.com/trade-resources/product-specifications.
IMPORTANT SAFETY INFORMATION
Below are the Product Safety Labels used in this manu-
al. The "Signal Words" used are WARNING and
CAUTION.
Please note that these safety labels are placed in areas
where awareness of personal safety and product safety
should be taken and lists the precautions to be taken
when the signal word is observed.
This manual is designed to be used by Certified Service Personnel only. Wolf Appliance, Inc. assumes no
responsibility for any repairs made to Wolf appliances by anyone other than Certified Service Technicians.
INDICATES THAT HAZARDOUS OR UNSAFE
PRACTICES COULD RESULT IN SEVERE PERSON-
AL INJURY OR DEATH.
Indicates that hazardous or unsafe practices could
result in minor personal injury or product and/or
property damage
In addition, please pay attention to the signal word
“NOTE”, which highlights especially important informa-
tion within each section.
The information and images are the copyright property of Wolf Appliance, Inc., an affiliate of
Sub-Zero Group, Inc. Neither this manual nor any information or images contained herein may be copied or used in
whole or in part without the express written permission of Wolf Appliance, Inc., an affiliate of Sub-Zero Group, Inc. ©
Wolf Appliance, Inc., all rights reserved.
TECHNICAL ASSISTANCE
If you should have any questions regarding the appli-
ance and/or this manual, please contact:
Wolf Appliance, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744 - 4988
Customer Care
Phone #: (800) 332 - 9513
Facsimile #: (608) 441 - 5887
Technical Assistance
(For Technicians in Customer’s Homes Only)
Phone #: (800) 919 - 8324
Warranty Claims
Phone #: (800) 404 - 7820
Facsimile #: (608) 441 - 5886
Service Department e-mail Address:
[email protected]
Main Office Hours:
8:00 AM to 5:00 PM Central Time
Monday through Friday
(24/7 Phone Coverage)

Page 3
General Information
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
1-3 #9001337 - Revision A - September, 2015
WARRANTY INFORMATION
This page contains a summary of the Warranty supplied with every Domestic Cup Warming Drawer (CW24).
2 & 5 Year Warranty Summary:
2 Year Total Product Warranty, Parts and Labor.•
3-5 Limited Parts Only Warranty.•
Details:
Warranty applies to products installed in United States or Canada, for residential use only.•
Warranty begins at time of unit’s initial installation.•
Warranty does not cover Wolf Appliances installed in a demonstration kitchen, test kitchen, culinary school•
kitchen, or similar installations. (See Special Warranty below)
Warranty and service information collected by Wolf Appliance, Inc. is arranged and stored under unit serial num-•
ber and/or customer’s name. Wolf Appliance, Inc requests that you have model and serial number available
whenever contacting factory or parts distributor.
3-5 Year Limited Parts Only Warranty applies to the heating element and the user interface.•
Special Warranty Summary
2 Year Total Product Warranty, Part and Labor.
Details:
This Warranty applies to products installed in United States or Canada, for use in a demonstration kitchen, test•
kitchen, culinary school kitchen, and similar installations that will help promote Wolf Appliance brand and its
products.
Warranty begins at time of unit’s initial installation.•
Warranty and Service information collected by Wolf Appliance, Inc. is arranged and stored under unit serial num-•
ber and/or customer’s name. Wolf Appliance, Inc. requests that you have model and serial number available
whenever contacting factory or parts distributor.
NOTE: “ICB” appliances carry no factory warranty. The product distributor or appliance dealer may offer their own
warranty.
Figure 1-2. The rating plate is located on the fan housing.
Figure 1-1. Typical Rating Label Layout
CW24/B
120V ~ 60Hz 420W
943028
G15D4Type.:
Madei nPortu
gal
Fabriqué auPo
rtugal
Household Use Only
Seulement pour applications domestiques
Ser. Nº.:
137750779
Manufactured:October 2014
Rating Plate

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
General Information
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#9001337 - Revision A - September, 2015
Refer to this key for an example of the model numbers.
Model: ICBCW 24 / S
International Designation
Product Configuration
Size
Finish
Product Configuration
CW = Cup Warming Drawer
Size
24 = 24 - inch wide unit
Finish
SClassic Stainless Steel
BBlack Glass
• Two finishes
Classic Stainless Steel
Black Glass
• Hidden electronic touch controls
• 420 watt heating element with temperature control
range of 85° F to 175° F
• Automatic shut off
• Delayed Start
• Push - pull drawer opening
• Full extension, ball-bearing drawer glides
• Removable, non-slip drawer liner
• Sabbath mode
CUP WARMING DRAWER FEATURES
MODEL NUMBER KEY

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Electronics
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#9001337 - Revision A - September, 2015
Cup Warming Drawer Electronics
This section describes the basic operation of the Cup Warming Drawer (CW24) electronics and how the user inter-
face responds to input commands. The user interface has three buttons that use a relay to open and close switches.
User Interface Buttons (See Figure 2-1)
ON/MENU Button
Turns unit on.•
Cycles user interface between menu options TEMP, TIMER, and DELAY START.•
Used with MORE button to enter Sabbath mode.•
Used with LESS/OFF button to exit Sabbath mode.•
LESS/OFF Button
Decreases TEMP, TIMER, and DELAY START settings.•
Depressed for three seconds turns the CW24 off.•
Used with ON/MENU button to exit Sabbath mode.•
MORE Button
Increases TEMP, TIMER, and DELAY START settings.•
Used with ON/MENU button to enter Sabbath mode.•
Figure 2-1. CW24 User Interface

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Electronics
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
2-3 #9001337 - Revision A - September, 2015
General Features of the User Interface
Temperature
Temperature Range is 85° F to 175° F, and increases and decrease by 10° intervals.•
Temperature display goes in a circle.•
If 175° F and MORE button is pressed, temperature goes to 85° F.•
If 85° F and LESS/OFF is pressed, temperature goes to 175° F.•
Timer
Timer is programmable from 1 minute to 4 hours.•
Timer increases and decreases by different increments.•
From 1 minute to 15 minutes changes by one minute intervals.•
From 15 minutes to 1 hour changes by five minute intervals.•
From 1 hour to 4 hours by ten minute intervals.•
Delay Start
Delay Start is programmable from 1 minute to 9 hours, 50 minutes.•
Delay Start increases and decreases by different increments.•
From 1 minute to 15 minutes and changes by one minute intervals.•
From 15 minutes to 1 hour and changes by five minute intervals.•
From 1 hour to 9 hours, 50 minutes and changes by ten minute intervals.•

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Electronics
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#9001337 - Revision A - September, 2015
User Interface Operation
Program the unit without DELAY START
Press ON/MENU. TEMP and 85° F flashes on the1
display (See Figure 2-2).
Press the MORE button to increase the tempera-2
ture.
NOTE: The display flashes three times then shuts off if
no other button is pressed.
Press ON/MENU when desired temperature is set.3
TIMER and 0h00 flashes on the display (See Figure4
2-3).
Press LESS/OFF or MORE button to set the amount5
of time the unit is to run between one minute and
four hours.
Press ON/MENU when desired time is set.6
DELAY START and 0h00 flashes on the display.7
Press ON/MENU, the temperature flashes for three8
seconds, then the fan comes on.
The display alternates between the setpoint temper-9
ature and the remaining time on the timer.
Program the unit with DELAY START
Press ON/MENU. TEMP and 85° F flashes on the1
display (See Figure 2-2).
Press the MORE button to increase the tempera-2
ture.
NOTE: The display flashes three times, then shut off if
no other button is pressed.
Press ON/MENU when desired temperature is set.3
TIMER and 0h00 flashes on the display (See Figure4
2-3).
Press LESS/OFF or MORE button to set the amount5
of time the unit is to run between one minute and
four hours.
Press ON/MENU when desired time is set.6
DELAY START and 0h00 flashes on the display.7
Press LESS/OFF or MORE button to set the amount8
of time before the unit starts, between one minute
and nine hours, 50 minutes (See Figure 2-4).
Press ON/MENU when the desired time is set.9
Temperature flashes for three seconds, then the dis-10
play shows the time remaining until the unit starts.
When the DELAY START time expires, the unit11
starts and the display alternates between the set-
point temperature and the remaining time on the
timer.
Figure 2-2. Setting Temperature
Figure 2-3. Setting Timer
Figure 2-4. Delay Start Display

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Electronics
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
2-5 #9001337 - Revision A - September, 2015
Turn the Unit Off
The Cup Warming Drawer can be shut off at any time or
during any mode, except Sabbath mode.
Press and hold the LESS/OFF button for three sec-1
onds.
Display shuts off.2
Fan runs for 60 seconds then shut off.3
Entering Sabbath Mode
Press and hold the ON/MENU button and the1
MORE button together for 3 seconds.
Heater comes on High (175°) and remain on indefi-2
nitely.
Display shows SAb (See Figure 2-5).3
NOTE: Loss of power causes the Cup Warming Drawer
to exit Sabbath Mode.
Exiting Sabbath Mode
Press and hold the ON/MENU button and the1
LESS/OFF button together for 3 seconds.
Fan runs for 60 seconds and then shut off.2
Figure 2-5. Sabbath Mode

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Component Removal
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#9001337 - Revision A - September, 2015
Drawer is heavy, use care not to damage drawer
slides or scratch frame of unit.
ELECTRICAL SHOCK HAZARD - DISCONNECT
ELECTRICAL SUPPLY TO UNIT BEFORE ATTEMPT-
ING THE FOLLOWING PROCEDURES.
COMPONENT ACCESS AND REMOVAL
This section explains how to access and remove components from a Cup Warming Drawer, model CW24.
An attempt has been made to arrange these procedures in such a way as to simulate which components would
need to be removed first in order to gain access to other components. When following a component removal
procedure, it may be necessary to reference another component removal procedure listed earlier in this section.
NOTE: Before continuing, please take note of the WARNINGS and CAUTIONS below.
- IF IT IS NECESSARY TO REMOVE A WARMING DRAWER UNIT FROM ITS INSTALLATION, REMEMBER
THAT THEY ARE HEAVY AND COULD FALL RESULTING IN SERIOUS INJURY. PULLING A UNIT FROM
ITS INSTALLATION SHOULD ONLY BE PERFORMED BY A TRAINED AUTHORIZED SERVICE
TECHNICIAN OR INSTALLER.
- TO AVOID ELECTRIC SHOCK, POWER TO A WARMING DRAWER UNIT MUST BE DISCONNECTED
WHENEVER ACCESSING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR
COMPONENTS NEAR OTHER ELECTRICAL COMPONENTS.
- Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
- The heating element can get very hot. To avoid personal injury use caution when servicing the unit,
making sure the heater has cooled before working on or around it.
- If accessing components under the shell, the insulation must be properly reinstalled and positioned.
Failure to do so may lead to damage to the surrounding cabinetry.
- Low voltage is used for most electronic control components. To avoid damaging the appliance, DO NOT
apply 115V AC to electronic control components.

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Component Removal
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
3-3 #9001337 - Revision A - September, 2015
Anti-sliding Liner
To remove the anti-sliding liner, first open the cup warm-
ing drawer, then lift the anti-sliding liner by the tappered
corner located in the right rear or left front of the drawer.
Tray and Front Cover Assembly
To remove the tray and front cover assembly, first open
the cup warming drawer, then (See Figure 3-1):
1. Use a T-20 to extract two screws entering the left
and right slide horizontally.
2. Use a T-10 to extract the two screws entering the
left and right slide vertically.
3. Pull the tray and cover assembly forward and lift
from the slides.
Right and Left Slides
The right slide includes the Push To Open (PTO)
assembly. To remove either slide, first remove the tray
and cover assembly, then (See Figure 3-2):
1. Remove the unit from the installation.
2. Use a T-20 to extract the four screws on the lower
side of the cup warming drawer, on the side of the
slide to be removed.
3. Remove the slide.
Exhaust Fan, User Interface, and Exhaust
Fan Cover
To remove the exhaust fan assembly, first remove the
tray and cover assembly, then (See Figure 3-3):
1. Remove the unit from the installation.
2. Remove the power cord from the back of the unit.
3. Use a T-20 to extract the four screws on the left side
of the unit holding the exhaust fan assembly.
Figure 3-1. Screws Tray and Front Cover
Figure 3-2. Screws for Slides
Figure 3-3. Screws for Exhaust Fan Housing

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Component Removal
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#9001337 - Revision A - September, 2015
User Interface and Exhaust Fan Cover
To remove the user interface and exhaust fan cover, first
remove the fan assembly, exhaust fan cover, and user
interface, then (See Figure 3-4):
1. Use a T-20 to extract the six screws on the top
and bottom of the exhaust fan cover.
2. Lift the rear of the exhaust fan cover and push it for-
ward over the fan retaining screws.
3. Disconnect the six pin connector from the user inter-
face.
4. Disconnect the ground wire spade connector from
the fan assembly support.
User Interface
To remove the user interface, first remove the exhaust
fan cover, with the user interface attached, then (See
Figure 3-5):
1. Use a flat bladed screw driver to depress the two
tabs on the back of the user face at the top, while
pushing the user interface out of the exhaust fan
cover.
2. Use a flat bladed screw driver to depress the two
tabs on the back of the user face at the bottom,
while pushing the user interface out of the exhaust
fan cover.
3. Remove the user interface.
Exhaust Fan and Heater
To remove the exhaust fan and heater, first remove the
exhaust fan cover and user interface, then (See Figure
3-6):
1. Use a T-20 to extract the four screws on the bottom
of the fan cover.
2. Disconnect the red and white wire from the male
side of the power cord receptacle.
Male Power Receptacle
To remove the male power receptacle, first remove the
exhaust fan cover and user interface, then (See Figure
3-6):
1. Use a T-20 to extract the four screws on the bottom
of the fan cover.
2. Depress the tabs on the inside of the fan cover to
remove the male power receptacle.
Figure 3-5. User Interface
Figure 3-4. Screws for Exhaust Fan Cover
Figure 3-6. Exhaust Fan and Heater
Tabs
Tabs

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Component Removal
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
3-5 #9001337 - Revision A - September, 2015
Tray and Front Cover Removal
To remove the tray and front cover as seperate parts,
first remove the tray and front cover as an assembly
from the cup warming drawer, then:
1. Use a T-20 to extract the six screws going into the
drawer back and the left and right bracket (See
Figure 3-7).
2. Remove the drawer back.
3. Use a T-20 to extract the four screws attaching the
front cover to the bottom of the tray (See Figure 3-
8).
4. Use a T-20 to extract the four screws attaching the
front of the tray to the front cover (See Figure 3-9).
5. Seperate the front cover and tray.
Figure 3-9. Screws Tray Front to Front Cover
Figure 3-7. Screws Drawer Back to Front Cover
Figure 3-8. Screws Front Cover to Tray Bottom

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Component Removal
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#9001337 - Revision A - September, 2015
Figure 3-10. Cavity Top
Cavity Top
To remove the cavity top, first remove the tray and front
cover as an assembly from the cup warming drawer,
then (See Figure 3-10):
1. Use a T-20 to extract the six screws, three on each
side.
2. Use a T-20 to extract the three screws at the back
bottom of the cavity top.
3. Remove the cavity top.
Right and Left Trim
To remove the right or left trim, first remove the cavity
top, then (See Figure 3-11):
1. Use a T-20 to extract the two screws from the trim
piece.
2. Rotate the back of the trim piece forward.
3. Slide the trim down the support tab and off the unit.
Cavity Cover
To remove the cavity cover, first remove the cavity top,
then (See Figure 3-12):
1. Use a drill to drill out the seven M3 x 5 mm pop riv-
ets on each side of the unit
2. Pull the cavity cover forward out of the unit.
NOTE: Order new pop rivets from the Parts Manual.
Lower Trim, and Upper Trim
To remove the lower and upper trim, first remove the
cavity top, then (See Figure 3-12):
1. Use a drill to drill out the seven M3 x 5mm pop riv-
ets.
2. Remove the upper and lower trim.
NOTE: Order new pop rivets from the Parts Manual.
Figure 3-11. Right and Left Trim
Figure 3-12. Cavity Cover, Lower and Upper Trim

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Troubleshooting Guide
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#9001337 - Revision A - September, 2015
TROUBLESHOOTING GUIDES
This section of the manual contains troubleshooting information which will help the Certified Service Technician trou-
bleshoot a Wolf Cup Warming Drawer (CW24).
How to Use the General Troubleshooting Guide
Find the general fault in following table, note the possible causes, then attempt the recommend solutions in the
order they are presented.
Before continuing, take note of the WARNINGS and CAUTIONS at the bottom of this page.
-IF REMOVING A CUP WARMING DRAWER FROM ITS INSTALLATION FOR TROUBLESHOOTING PUR-
POSES, REMEMBER THAT THE UNIT IS HEAVY AND COULD TIP AND/OR FALL WHEN PULLED FOR-
WARD. RESULTING IN SERIOUS INJURY OR DEATH.
-TO AVOID ELECTRIC SHOCK, POWER TO THE UNIT MUST BE DISCONNECTED WHENEVER ACCESS-
ING AND/OR REMOVING COMPONENTS POWERED BY ELECTRICITY OR COMPONENTS NEAR OTHER
ELECTRICAL COMPONENTS. IF THE UNIT IS PLUGGED IN, BUT HAS NOT BEEN SWITCHED ON BY
PRESSING THE UNIT ON/OFF KEY, 115 VOLTS AC IS STILL PRESENT AT THE USER INTERFACE.
- Metal edges may be sharp. Use caution when servicing unit to avoid personal injury.
- The heating element can get very hot. To avoid personal injury use caution when servicing the unit,
making sure the heater has cooled before working on or around it.

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Troubleshooting Guide
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
4-3 #9001337 - Revision A - September, 2015
PROBLEM POSSIBLE CAUSE TEST / ACTION
A. Unit Does Not Function
B. No Heat
C. No Fan
D. Unit will not go into or out of
Sabbath mode.
No Power to Unit
Disconnected Cable or Broken Wiring
No Power to Unit
User Interface is not setting temperature
in the unit.
Heater is open1
TCO is open2
Broken wire in heating circuit3
No Power to Unit
User Interface is not turning the unit on
Fan is open1
Broken wire in fan circuit2
Fan is blocked or dirty
User interface is not working correctly
Check power receptacle for proper voltage.1
Confirm Ground is good.2
Ensure circuit is dedicated.3
Inform consumer of electrical supply issue.4
Confirm voltage on J6 harness from J6-1 to1
J6-4.
Confirm good ground from the unit to a2
separate ground terminal on a different
receptacle.
Repair or replace wiring damage.3
Check power receptacle for proper voltage.1
Confirm Ground is good.2
Ensure circuit is dedicated.3
Inform consumer of electrical supply issue.4
Switch unit ON and confirm temperature is1
being set on the user interface.
Replace user interface.2
Measure resistance on J6 harness from J6-1
5 to J6-6. Resistance should be 33.8
Ohms ± 10%.
Replace the Fan, which includes the heat-2
ing element, TCOs, and fan.
Check power receptacle for proper voltage.1
Confirm Ground is good.2
Ensure circuit is dedicated.3
Inform consumer of electrical supply issue.4
Switch unit ON and program a DELAY1
START. Verify DELAY START begins to
count down.
Replace user interface.2
Measure resistance on J6 harness from J6-1
2 to J6-3. Resistance should be 56.2
Ohms ± 10%.
Replace the Fan, which includes the heat-2
ing element, TCOs, and fan.
Clean the fan.
Replace the user interface.
General Troubleshooting Guide

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Troubleshooting Guide
4-4
#9001337 - Revision A - September, 2015
PROBLEM POSSIBLE CAUSE TEST / ACTION
E. Drawer Does Not Slide
Smoothly
F. Push To Open (PTO) is not
operating correctly.
Drawer Overloaded
Drawer Misaligned
Drawer Rails are binding
Drawer Overloaded
Drawer Misaligned
Drawer Rails are binding
PTO is damaged
Drawer is overloaded. Maximum weight is1
25 pounds.
Reduce and/or redistribute drawer contents.2
Drawer is out of alignment. Fully extend the1
drawer and close completely to realign.
Drawer is not installed correctly and is bind-2
ing.
Drawer is not installed correctly and is tilted.3
Correct alignment issue.4
Drawer rails are loose.1
Drawer rails have debris in them.2
Tighten or replace drawer rail.3
Drawer is overloaded. Maximum weight is1
25 pounds.
Reduce and/or redistribute drawer contents.2
Drawer is out of alignment. Fully extend the1
drawer and close completely to realign.
Drawer is not installed correctly and is bind-2
ing.
Drawer is not installed correctly and is tilted.3
Correct alignment issue.4
Drawer rails are loose.1
Drawer rails have debris in them.2
Tighten or replace drawer rail.3
Replace right drawer rail.

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Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Technical Data
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#9001337 - Revision A - September, 2015
Technical Data
Power Requirements 120 VAC, Single Phase, 60 Hertz
Watts 450 Watts (rated)
Amps 5 Amps (rated)
Circuit Requirements 10 amp Dedicated Circuit
Temperature Range 85° F to 175° F, 10° F intervals
Element type Radiant
Heater Resistance 33.8 Ohms ± 10%
Fan Motor Resistance 56.2 Ohms ± 10%
Thermal Cut Out (TCO) 1 Temperature 176° F
TCO 2 Temperature 248° F

Page 18
Cup Warming Drawer (CW24)
Cup Warming Drawer (CW24)
Wire Diagrams
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#9001337 - Revision A - September, 2015
M
L1
N
654
321
456
123
J6 Board
J6 Connector
on Harness
Fan Motor
Ground
TCO 1 TCO 2
Heater
Male Plug
Harness in Exhaust Fan Housing
Ground
to Fan
J5
Board in User Interface
Relay 1
Relay 2
J6-4 & Relay 2
J6-4 & Relay 1
J6-6
J6-3
User Interface Button
User Interface Button
White Wires
120 Volts Line In
Neutral
Ground
L1
N
Key
WIRING DIAGRAM
MODEL: CW24 - This wiring information is provided for use by qualified service personnel only.
- Disconnect appliance from electrical supply before begining service.
- Be sure all grounding devices are connected when service is complete.
- Failure to observe the above warnings may result in severe electrical shock.