Subzero Wolf UC-24C User manual

1-2
#7031931 - Revision A - June, 2014
General Information UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000)
(SWS #3603000)
IMPORTANT SAFETY INFORMATION
Below are the Product Safety Labels used in this manu-
al. The "Signal Words" used are WARNING or CAU-
TION.
When reviewing this manual, please note these differ-
ent Product Safety Labels placed at the beginning of
certain sections of this manual. You must follow the
instructions given in the boxes below the Product
Safety Labels in order to avoid personal injury and/or
product damage.
The sample Product Safety Labels below illustrate the
precautions that should be taken when the signal word
is observed.
INTRODUCTION
This Technical Service Manual has been compiled to provide the most recent information on safety, installation,
operation, features, troubleshooting, wiring diagrams, and repair procedures for the Under Counter Series starting
with serial number 3603000. This information will enable the service technician to troubleshoot and diagnose mal-
functions, perform necessary repairs, and return an Under Counter Series appliance to proper operational status.
The service technician should read the complete instructions contained in this technical service manual before initiat-
ing any repairs.
INDICATES THAT HAZARDOUS OR UNSAFE PRAC-
TICES COULD RESULT IN SEVERE PERSONAL
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 information that is especially
important for the topic being covered.
This manual is designed to be used by Authorized Service Personnel only. Sub-Zero Group, Inc. assumes
no responsibility for any repairs made on Sub-Zero refrigeration units by anyone other than Certified
Service Technicians.
Information and images contained in this manual are the copyright property 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 consent of Sub-Zero Group, Inc.
© Sub-Zero Group, Inc, all rights reserved.
TECHNICAL ASSISTANCE
If you should have any questions regarding a Sub-Zero
appliance and/or this manual, please contact:
Sub-Zero Group, Inc.
ATTN: Service Department
P.O. Box 44988
Madison, WI 53744-4988
Customer Assistance
Phone #: (800) 222 - 7820
Facsimile #: (608) 441 - 5887
Technical Assistance
(For Technicians in Customer’s Homes Only)
Phone #: (800) 919 - 8324
Parts / 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)

1-3 #7031931 - Revision A - June, 2014
UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000) (SWS #3603000) General Information
Section 1 - General Information 1-1
Introduction ....................................................................... 1-2
Important Safety Information ............................................ 1-2
Technical Assistance ........................................................ 1-2
Table of Contents .............................................................. 1-3
Warranty Information ........................................................ 1-5
Model Description ............................................................. 1-6
Section 2 - Installation Information 2-1
Installation Considerations ................................................ 2-2
Site Preparation ............................................................. 2-2
Opening Dimensions .................................................. 2-2
Undercounter Models .............................................; 2-2
Dual Installation ...................................................... 2-2
Electrical .................................................................... 2-3
Plumbing .................................................................... 2-3
Preparation ................................................................ 2-4
Anti-Tip Bracket ......................................................... 2-4
Installation ..................................................................... 2-5
Leveling ...................................................................... 2-5
Door Adjustment ........................................................ 2-5
Placement .................................................................. 2-5
Water Line (UC-24CI) ................................................ 2-6
Anchoring ................................................................... 2-6
Panel Installation ........................................................... 2-7
Custom Door Panel ................................................... 2-7
Models UC24R and UC-24C(I) .............................. 2-7
Models UC24BG ..................................................... 2-8
Full Scale Template ....................................................... 2-9
Section 3 - Electronic Control System Information 3-1
Electronic Control Terminology &
Component Descriptions ................................................... 3-2
Electronic Control System Overview ................................. 3-3
Control Board Layout & Summary Table ......................... 3-4
Control Panel Layout ........................................................ 3-5
Basic Electronic Control Input Operations ...................... 3-5
Unit Power ON/OFF ...................................................... 3-5
Adjusting Set-Point (Temp. Adjustment) ...................... 3-6
Door Ajar Alarm ON / OFF ............................................ 3-6
Unique Electronic Control Input Operations ..................... 3-7
Temperature Units Selection (UC-24C) ......................... 3-7
Temperature Units Selection (UC-24B/R/RO) ............... 3-8
Sabbath Mode ............................................................... 3-9
Showroom Mode........................................................... 3-10
Functions of Electronic Control System ......................... 3-11
Display Zone Temperatures ........................................ 3-11
Supply Power to Lighting System .............................. 3-11
Regulate Freezer Zone Temperature (UC-24C) .......... 3-12
Regulate Refrigerator Zone Temperature (UC-24C) ... 3-13
Regulate Refrig. Zone Temp. (UC-24B/R/RO) ............ 3-14
Minimize Condensation on Glass Door (UC-24B) ....... 3-15
Freezer Adaptive Defrost (UC-24C) ............................ 3-16
Refrigerator Fan-Assisted, Off-Cycle Defrost
(UC-24B/R/RO) ........................................................... 3-17
Monitor Compressor Run - Display SERVICE ............ 3-18
Possible Error Indicators ................................................. 3-19
Troubleshooting Input Operations ................................... 3-20
Diagnostic Mode (Actual Temp. Display Mode) .......... 3-20
Thermistor Location Code Tables .......................... 3-20
Diagnostic Mode Indicators ..................................... 3-21
Error Code Table ..................................................... 3-21
Clearing Non-Flashing “SERVICE” & Error Codes .. 3-22
Manual Component Activation Mode .......................... 3-23
Temperature Log Recall Mode .................................... 3-24
Compartment Temperature History Only ................. 3-24
Compartment & Evaporator Temperature History .... 3-25
Temperature Log Event Indicators ........................... 3-26
Temperature Log Index Chart .................................. 3-27
Service Input Operations ................................................. 3-28
Automatic Entry Model Configuration Mode ................ 3-28
Model Code Table .................................................... 3-28
Manual Entry Model Configuration Mode .................... 3-29
Manual Freezer Evaporator Defrost (UC-24C) ............ 3-30
Section 4 - Sealed System Information 4-1
HFC-134a Refrigerant Service Information ...................... 4-2
134a Refrigerant Caution ............................................... 4-2
General Rules for Working with 134a Refrigerant ........ 4-2
Sealed System Repair Procedures Table ...................... 4-3
Sealed System Operation ................................................ 4-4
Sealed System Refrigerant Flow Diagrams ..................... 4-6
Section 5 - Air Flow & Fan Blade Spacing 5-1
Model UC-24B/R/RO ......................................................... 5-2
Model UC-24C ................................................................... 5-2
TABLE OF CONTENTS
Page # Page #

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#7031931 - Revision A - June, 2014
General Information UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000)
(SWS #3603000)
Section 6 - Icemaker Information 6-1
Modular Icemaker ........................................................... 6-2
Modular Icemaker Operation ...................................... 6-2
Additional Icemaker Operation Notes ......................... 6-3
What Happens During Ejector Blade Rotation ............ 6-3
Modular Icemaker Test Procedures ................................ 6-4
Voltage Tests ................................................................ 6-4
Continuity Tests & Thermostat Inspection ................... 6-4
Water Fill Adjustment ...................................................... 6-5
Icemaker Disassembly .................................................... 6-5
Module/Motor Assembly ............................................. 6-5
Mold/Heater Assembly ............................................... 6-5
Ejector Blades and/or Ice Stripper .............................. 6-5
Icemaker Thermostat ................................................. 6-5
Section 7 - Component Access and Removal 7-1
WARNINGS & CAUTIONS .............................................. 7-2
Model UC-24B ................................................................. 7-3
Exterior Cosmetic / Mechanical Components ............... 7-3
Interior Cosmetic / Mechanical Components ............... 7-5
Unit Tray Mechanical Components .............................. 7-10
Sealed System Components ....................................... 7-11
Model UC-24C ................................................................ 7-13
Exterior Cosmetic / Mechanical Components ............. 7-13
Interior Cosmetic / Mechanical Components .............. 7-15
Unit Tray Mechanical Components ............................. 7-21
Sealed System Components ...................................... 7-23
Model UC-24R and UC-24RO ...................................... 7-25
Exterior Cosmetic / Mechanical Components ............ 7-25
Interior Cosmetic / Mechanical Components .............. 7-27
Unit Tray Mechanical Components ............................. 7-31
Sealed System Components ....................................... 7-32
Section 8 - Troubleshooting Guides 8-1
Troubleshooting Guides .................................................... 8-2
How to Use the Error Code Troubleshooting Guide ......... 8-2
Error Code Table ........................................................... 8-2
Error Code Troubleshooting Guide ................................... 8-3
How to Use the General Troubleshooting Guide .............. 8-6
Temperature Problem Instructions ................................ 8-6
Thermistor Location Code Tables ................................ 8-6
General Troubleshooting Table of Contents ...................... 8-7
General Troubleshooting Guide ........................................ 8-8
Sealed System Diagnostic Tables ................................. 8-15
Normal Operating Pressures ....................................... 8-15
Pressure Indications .................................................... 8-15
Temperature/Pressure Correlation ............................... 8-16
Membrane Switch / Ribbon Cable Test .......................... 8-17
Page # Page #
Section 9 - Technical Data Tables 9-1
Model UC-24B ................................................................... 9-2
Model UC-24C ................................................................... 9-3
Model UC-24R / UC-24RO ................................................ 9-4
Section 10 - Wiring Diagrams 10-1
UC-24C Wiring Diagram.................................................. 10-2
UC-24C Wiring Schematic ........................................... 10-3
UC-24B / UC-24R / UC-24RO Wiring Diagram................ 10-4
UC-24B / UC-24R / UC-24RO Wiring Schematic ........ 10-5

1-5 #7031931 - Revision A - June, 2014
UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000) (SWS #3603000) General Information
Figure 1-1. Serial Tag Layout
(The serial number tag is located on the upper left side wall of the compartment.)
WARRANTY INFORMATION
This page summarizes the 2, 5 & 12 Year Warranty
supplied with every unit (except the model UC-24RO),
as well as the two special warranties: The Non-
Residential Warranty which applies to units installed in
non-residential applications, and the Display/Model
Home Warranty which applies to distributor or dealer’s
display units and units in model homes, sold three
years after date of manufacture. The last entries on
this page are details and notes about the warranties.
TWO, FIVE & TWELVE YEAR Warranty Summary
• Two Year TOTAL PRODUCT Warranty, *parts & labor.
• Five Year SEALED SYSTEM Warranty, **parts &
labor.
• Sixth through Twelfth Year LIMITED SEALED SYS-
TEM Warranty, sealed system **parts only.
ONE & FIVE YEAR Non-Residential Warranty
Summary (Example: Office, Yacht, etc. and the
model UC-24RO)
• One Year TOTAL PRODUCT Warranty, *parts & labor.
• Five Year LIMITED SEALED SYSTEM Warranty,
sealed system **parts only.
ONE & FIVE YEAR Display/Model Home Warranty
Summary (Display units sold three years after date
of manufacture)
• One Year TOTAL PRODUCT Warranty, *parts & labor.
• Five Year LIMITED SEALED SYSTEM Warranty,
sealed system **parts only.
Warranty Details:
* Total Product Parts includes, but is not limited to the
following:
Electronic Control System Components, Switches, Fan
Motors & Blades, Defrost & Drain Heaters, Defrost
Terminators, Drain Pans, Drain Tubes, Wiring, Light
Sockets & Bulbs, Icemakers, Water Valves, Door
hinges, Compressor Electricals, etc. . .
** Sealed System Parts includes the following:
Compressors, Condensers, Evaporators, Filter-Driers,
Heat-exchangers, All Tubing That Carries the Freon.
NOTE: Condenser Fan Motors, Freon, Solder and
compressor electricals are NOT considered sealed
system parts.
Warranty Notes:
• All warranties begin at the time of the unit's initial
installation.
• All Warranty and Service information collected by Sub-
Zero is arranged and stored under the unit serial num-
ber, and when provided and/or available, the cus-
tomer's last name.
NOTE: Sub-Zero still requests that you have the
model and serial number available whenever contact-
ing the factory or parts distributor.
• The serial number tag is located on the upper left side
wall of the compartment. (See Figures 1-1, for serial
tag layout)



 
   
 

  
  

 

 

Model Number Serial Number Manufacture Date
Refrigerant Charge Total Amps Refrigerant Type

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#7031931 - Revision A - June, 2014
General Information UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000)
(SWS #3603000)
MODEL DESCRIPTIONS
This page briefly describes the models covered in this manual, which are UC-24B, UC-24C, UC-24R and UC-24RO.
Model UC-24B (Figure 1-2)
Under Counter Series, 24” Width, Beverage Center
•Exterior Dimensions = 34” H x 23-7/8” W x 24” D
• One (1) Adjustable Wine/Beverage Storage
Shelf/Rack
• Two (2) Adjustable Glass Shelf
• One (1) Stationary Shelf
• One (1) Utility Bin
• Full-View Glass Door
Model UC-24C (Figure 1-3)
Under Counter Series, 24” Width, Combination -
Refrigerator / Freezer
•Combination Refrigerator Temperature Zone over
Freezer Temperature Zone
•Exterior Dimensions = 34” H x 23-7/8” W x 24” D
• One (1) Wine/Beverage Storage Shelf/Rack
• One (1) Adjustable Glass Shelf
• One (1) Stationary Shelf
• One (1) Door Shelf
• Automatic Icemaker
• Automatic Defrost
Model UC-24R (Figure 1-4)
Under Counter Series, 24” Width, All Refrigerator
•One Refrigerator Temperature Zone
•Exterior Dimensions = 34” H x 23-7/8” W x 24” D
• Two (2) Adjustable Glass Shelf
• One (1) Stationary Glass Shelf
• One (1) Utility Bin
• Two (2) Door Shelves
(Bottom Door Shelf Holds 2-liter Bottles)
Model UC-24RO (Figure 1-4)
Under Counter Series, 24” Width, All Refrigerator for
Outdoor Use
•One Refrigerator Temperature Zone
•Exterior Dimensions = 34” H x 23-7/8” W x 24” D
• Two (2) Adjustable Glass Shelf
• One (1) Stationary Glass Shelf
• One (1) Utility Bin
• Two (2) Door Shelves
(Bottom Door Shelf Holds 2-liter Bottles)
• Door Lock
Figure 1-3. Model UC-24C
Figure 1-4. Model UC-24R & UC-24RO
Figure 1-2. Model UC-24B

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#7031931 - Revision A - June, 2014
Installation Information UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000)
(SWS #3603000)
INSTALLATION CONSIDERATIONS
This section covers some of the more common installation issues seen by a Service Technician. An improper instal-
lation, though not a valid service issue, has the potential to lead to a call for service. Installation related complaints
could include, but are not limited to: Unit leveling, unit movement, door misalignment, door not sealing, internal frost
or condensation, exterior condensation, warm compartment temperatures, etc.
NOTE: If additional installation information is needed, refer to the complete Installation Manual, or contact the Sub-
Zero Service Department.
Opening Dimensions
UNDERCOUNTER MODELS
W
OPENING WIDTH
34 1/2"
(876)
OPENING
HEIGHT
24" (610)
OPENING
DEPTH
TO P VIEW
SIDE
VIEW FR ONT VIEW
OPENING WIDTH W
UC-24R 24" (610)
UC-24BG 24" (610)
UC-24C(I) 24" (610)
UC-24RO 24" (610)
DUAL OPENING WIDTH W
Two 24" (610) Models 48 1/8"(1222)
Dual installation kit required.
DUAL INSTALLATION
WITHOUT FILLER STRIP FILLER STRIP
Opposite hinges. Same side hinges.
If two units are installed side by side, a dual installation kit
may be required. Installations without a custom ller strip
require a dual installation kit. If a dual installation kit is not
specied, a 2" (51) ller strip is recommended between units.
Dual installations without a ller strip can only be accomplished
using two units with opposite hinges. Refer to the
illustrations below.
Dual installation kits are available through an authorized
Sub-Zero dealer. For local dealer information, visit the nd a
showroom section of our website, subzero.com. For questions
regarding the installation, call Sub-Zero customer care
at 800-222-7820.
Site Preparation

Electrical
ELECTRICAL REQUIREMENTS
Electrical Supply 115 VAC, 60 Hz
Service 15 amp
Receptacle 3-prong grounding-type
WARNING
Do not use an extension cord, two-prong adapter or
remove the power cord ground prong.
Plumbing
PLUMBING REQUIREMENTS
Water Supply 1/4" OD copper, braided
stainless steel or PEX tubing
Pressure 20–100 psi (1.4–6.9 bar)
Excess Line for Connection 36" (914)
3" (76)
15 1/2"
(394)
2"
(51)
LEFT SIDE
OF OPENING
FLOOR
Electrical supply location.
3" (76)
15 1/2"
(394)
2"
(51)
LEFT SIDE
OF OPENING
AREA EXTENDS 1/2"(13)
FOR WARD ON FLOOR
Water supply location.
Installation must comply with all applicable electrical codes.
The electrical supply should be located within the shaded
area shown in the illustration below. A separate circuit,
servicing only this appliance is required.
IMPORTANT NOTE: The electrical outlet must be placed so
the grounding prong is to the right of the thinner blades.
The outlet must be ush with the back wall.
Model UC-24RO is designed and safe for use in outdoor
applications. When installed outdoors, a ground fault
circuit interrupter (GFCI) is required to reduce the risk of
electrical shock. A GFCI is not recommended for use with
other undercounter models and may cause interruption of
operation.
Installation must comply with all applicable plumbing codes.
For model UC-24CI, the water supply should be located
within the shaded area shown in the illustration below.
The water supply line should be connected to the house
supply with an easily accessible shut-o valve. Do not use
self-piercing valves.
A reverse osmosis system can be used provided there is
constant water pressure of 20–100 psi (1.4–6.9 bar) supplied
to the unit at all times. A copper line is not recommended
for this application.
2-3 #7031931 - Revision A - June, 2014
UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000) (SWS #3603000) Installation Information
Site Preparation

2-4
#7031931 - Revision A - June, 2014
Installation Information UNDER COUNTER SERIES
UNDER COUNTER SERIES (SWS #3603000)
(SWS #3603000)
Preparation Anti-Tip Bracket
WARNING
To prevent the unit from tipping forward, the anti-tip
bracket must be installed.
1/4"(6)
ANTI-TIP
BRA CKET
Anti-tip bracket.
To operate properly, the door must open a minimum of 90°.
Use a minimum 3" (76) ller in corner installations to assure
a 90° door opening.
Uncrate the unit and inspect for damage. Remove and
recycle packing materials. Do not discard the kickplate, antitip
bracket, hardware and the leveling legs which hold the
wood base to the bottom of the unit.
The anti-tip bracket should be attached to the wall behind
the unit with the bracket ange located 1/4" (6) above the top
of the unit. Refer to the illustration below. Failure to properly
position the anti-tip bracket will prevent proper engagement.
Site Preparation