Sub-Zero PRO 48 User manual

USE & CARE GUIDE
PRO 48 Refrigeration

Important Note
To ensure the safe and efficient use of Sub-Zero equip-
ment, please take note of the following types of highlighted
information throughout this guide:
IMPORTANT NOTE highlights information that is especially
important.
CAUTION signals a situation where minor injury or product
damage may occur if instructions are not followed.
WARNING states a hazard that may cause serious injury or
death if precautions are not followed.
Contents
PRO 48 Refrigeration ............................ 3
PRO 48 Features ................................ 4
PRO 48 Models ................................. 5
PRO 48 Use & Care .............................. 6
Keeping Food at Its Best ........................ 15
Food Storage Recommendations ................. 19
Water Filtration System Data ..................... 25
California Certification .......................... 26
Troubleshooting Guide .......................... 27
Service Information ............................. 30
Sub-Zero Warranty ............................. 31
Features and specifications are subject to change at any time
without notice. Visit our website, subzero.com for the most
up-to-date information.

PRO 48 Refrigeration 3
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Thank You
Thank you for purchasing your new Sub-Zero PRO 48 unit.
With Sub-Zero, you can rely on a 60-year tradition of
quality and reliability.
Built in to cabinetry or freestanding, the PRO 48 is just
the latest example of Sub-Zero pushing food preservation
to new heights. And of course, the PRO 48 meets rigorous
Department of nergy standards for residential use.
Featuring a glass door on model 648PROG or top-to-
bottom stainless steel on model 648PRO. The PRO 48
brings together the latest technology and finest features in
home refrigeration to give you the freshest food possible.
Your Sub-Zero is protected by a warranty that is one of
the finest in the industry. Take a moment to read the
warranty statement at the end of this guide and refer to it
should service become necessary.
This use & care guide will answer most of your questions
about the features, operation and maintenance of your
PRO 48 unit. If you have questions that are not addressed
here, call Sub-Zero customer care at 800-222-7820 or visit
our website, subzero.com.
Dual Refrigeration
The PRO 48 continues the Sub-Zero tradition of superior
quality and reliability. Sub-Zero pioneered the develop-
ment of our dual refrigeration system, giving you optimum
fresh and freezer food storage in ideal self-contained
sections. Both refrigerator and freezer maintain accurate,
consistent temperatures. Dual refrigeration keeps your
food fresh longer than any other system available.
With dual refrigeration, the freezer maintains a constant
temperature within one degree of the temperature you set
within our range of -5°F (-21°C) to +5°F (-15°C), without
unwanted moisture and odor from the refrigerator. Simi-
larly, you can adjust the refrigerator temperature within a
range of 34°F (1°C) to 45°F (7°C), for proper humidity levels
tailored for longer food life expectancy.
The dual refrigeration system also means there is no
transfer of fresh food odors to frozen food or ice. The
Sub-Zero system does not freeze the moisture out of the
air in the fresh food section.
Sub-Zero dual refrigeration is also more energy efficient
than old-fashioned single refrigeration systems. When the
refrigerator is used frequently during the day it does not
require the freezer to circulate its very cold, dry air to the
refrigerator. Instead, the refrigerator uses moist air to keep
fresh foods fresh and energy use minimal.

PRO 48 Features 4
PRO 48 Features
•Can be built in or, with the freestanding accessory kit,
used in a freestanding application.
•Stainless steel construction, inside and out, for profes-
sional strength and beauty.
•Dual refrigeration system with two compressors and
three evaporators keep foods fresher longer and
prevent odor transfer.
•Microprocessor with up-front touch controls monitor
pattern-sensing defrost and automatic service alerts.
•xterior temperature displays with easy-to-read digital
readout are accurate within one degree of your preset
temperatures.
•Triple-pane, UV-resistant glass door (model 648PROG).
•L D lights bathe upper compartments in a soft glow.
Channeled sidewall L Ds on the refrigerator side can
serve as a door area night light (model 648PROG).
•Auto-close system with an advanced hinge design lets
doors finish closing easily and automatically.
•Adjustable shelves are cantilevered and spill-proof,
with stainless steel trim (refrigerator) and 100%
stainless steel (freezer).
•Removable, slide-out stainless steel bins hold small
items and fit neatly under any shelf.
•Touch-and-glide crisper drawer with a tight-sealing
clear cover gives vegetables generous humidity.
•Storage drawers allow full access to food with
adjustable, removable and interchangeable dividers.
•Automatic ice maker with advanced water filtration
system for ice as pure as it is fresh.
•asy-access grille flips up, without tools, to access the
water filter for replacement and condenser for cleaning.
•Alarm with an audible chime lets you know when doors
or drawers are left open.
•Holiday mode allows you to power down one or both
sides for extended periods or just the weekend.
•For installations at or above 5,000' (1524 m) in eleva-
tion, high altitude glass is available as a special order.
•Certified by Star-K to meet religious regulations.
•UL approved for US and Canada.
•Sub-Zero products are covered by a two, five and
twelve year residential warranty (exclusions apply).
See warranty details at the end of this guide.
This appliance is certified by Star-K to meet
strict religious regulations in conjunction with
specific instructions found on www.star-k.org.

PRO 48 Models 5
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PRO 48 Models
MODELS 648PRO AND 648PROG
Model 648PROG
with glass door
Model 648PRO
Automatic ice
maker
Auto-close
hinge system
Location of
water filter
xterior freezer
temperature display
asy-access grille
Adjustable stainless
steel shelves
Location of rating
plate (open drawer)
Sidewall lighting
Stainless steel
construction
Storage drawers
with dividers
Adjustable spill-
proof glass shelves
Touch control
panel
Microprocessor
xterior refrigerator
temperature display
Slide-out stainless
steel bins
Crisper drawer
Triple-pane, UV-resis-
tant glass (648PROG)
Dual refrigeration
system
Model 648PROG with glass door shown.

lectronic Control System
The electronic control system of the PRO 48 monitors and
accurately displays compartment temperatures within one
degree of your pre-set temperatures. It also monitors the
operation of the unit and lets you know if there is a
problem. The interior control panel located at the top of
the refrigerator door compartment has key pads to set
temperatures and control functions of the electronic
control system. Refer to the illustration below.
TEMPERATURE CONTROL
Your new PRO 48 was thoroughly inspected and tested
before it was shipped from the Sub-Zero factory. Tempera-
tures are preset at 38°F (3°C) in refrigerator compartments
and 0°F (-18°C) in the freezer compartments.
There are three sets of WARM R and COLD R key pads
on the interior control panel, two for the refrigerator
compartments (upper door and lower drawers) and one for
the freezer compartments. To adjust the temperature in
any of the three compartments, press the WARM R or
COLD R key pad for that compartment. Digital tempera-
tures for each of the three compartments are displayed in
the exterior temperature display.
Temperature ranges are -5°F (-20°C) to +5°F° (-15°C°) in the
freezer sections and 34°F (1°C) to 45°F (7°C) in the refriger-
ator sections. It is normal for temperatures to fluctuate
slightly, depending on external influences such as an open
door, the degree of humidity and room temperature.
IMPORTANT NOTE: Always allow 24 hours for compart-
ments to reach the temperature you set.
PRO 48 Use & Care 6
EXTERIOR TEMPERATURE DISPLAYS
lectronic control system functions, such as digital
temperatures and service indicators, are displayed in two
exterior temperature displays located on the grille. The
display in the lower left area of the grille shows the
temperature and indicators for freezer compartments, and
the display in the lower right gives readouts for refrigerator
compartments. Refer to the illustrations below.
TEMPERATURE DISPLAY
The electronic control system can display temperatures in
Fahrenheit (°F) or Celsius (°C).
To convert Fahrenheit to Celsius, turn the unit off then
back on. Within the first minute after turning the unit on,
press and hold the ALARM key pad and the POW R key
pad simultaneously for five seconds, then release. A ‘C’
will appear in each of the exterior temperature displays.
Follow the same procedure to convert from Celsius to
Fahrenheit.
Freezer Temperature
Controls
Ice Maker
On/Off
Power
On/Off
Alarm
On/Off
Lights
On/Off
Refrigerator
Temperature Controls
Upper
Compartment
Drawer
Compartments
Exterior temperature displays.
Control panel.

PRO 48 Use & Care 7
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lectronic Control System
POWER
The POW R key pad on the control panel will shut off all
electrical power to the unit. When the power is off, the
OFF indicator light will be visible in the exterior tempera-
ture display. Using the POW R key pad means you do not
have to shut off power at the circuit breaker or unplug the
unit. The POW R key pad can be used for extended
vacations.
It is possible to shut off power to one compartment of the
PRO 48 for an extended period without affecting operation
of the other compartments.
First, turn the unit off by pressing the POW R key pad.
Then push and hold the WARM R key pad of the
compartment you wish to shut down. Press the POW R
key pad to turn the unit back on. The disabled zone will be
indicated with ‘--’ in the exterior temperature display.
Repeat the process to resume power to the compartment.
ALARM FEATURE
The PRO 48 has an alarm feature that lets you know with
an audible chime if a door or drawer is left ajar. The alarm
will sound after 30 seconds if a door or drawer is left open
and will stop once the door or drawer is closed. This alarm
can be disabled for cleaning or restocking by pressing the
ALARM key pad on the control panel.
ICE MAKER CONTROL
The IC MAK R key pad on the control panel switches
power to the ice maker system on or off. Use the IC
MAK R key pad to shut down ice maker operation during
extended vacations. The ice bucket icon will be visible in
the exterior temperature display if the ice maker system
is on.
VISUAL SERVICE DISPLAY
The electronic control system monitors compartment and
component temperatures as well as the ice maker system.
If there is a temperature or ice maker problem, you will be
alerted by a flashing S RVIC indicator light in the exterior
temperature display. This same S RVIC light will also
flash if the condenser needs cleaning.
SABBATH MODE (STAR-K)
Sabbath mode is available for the observance of certain
religious holidays. This mode turns off the lights, ice maker
system and door alarm and prevents them from turning on
again. Normal cooling operations will still take place.
To initiate Sabbath mode while the unit is on, press the
POW R key pad on the control panel so that ‘OFF’ is
visible in the exterior temperature display. Then press and
hold the POW R key pad for 10 seconds. This will turn the
unit back on with lights and ice maker disabled. There will
be four short chimes, indicating that the Sabbath mode
has been set. To return the unit to normal operation, press
and release the POW R key pad.
If you have questions about Star-K compliance, visit
www.star-k.org.
Shut off power to the unit at the control panel during
service.

PRO 48 Use & Care 8
Refrigerator Storage
AD USTABLE GLASS SHELVES
The adjustable glass shelves of the PRO 48 upper refriger-
ator compartment are cantilevered and spill proof with
stainless steel trim.
To remove a shelf, tilt the shelf up at the front, then lift it
up and out of the tracks on the rear wall of the refrigerator.
To replace a shelf, insert in the tracks with the front of the
shelf raised slightly. As you push the shelf in, lower the
front of the shelf until it locks into position. Refer to the
illustration below.
IMPORTANT NOTE: Use care when handling glass shelves
to prevent breaking the glass or scratching the interior.
AD USTABLE SLIDE-OUT BINS
The PRO 48 features two versatile, adjustable stainless
steel slide-out bins that fit neatly under any refrigerator
compartment shelf. The glass shelves have integrated rails
that make it possible to position the slide-out bins in a
variety of locations.
To remove the slide-out bin, pull the handle of the bin
forward until it stops, lift it up and out of the rails mounted
below the glass shelf. Refer to the illustration below.
CRISPER LID
The PRO 48 upper refrigerator drawer features a tight-
sealing crisper lid for higher humidity storage in the
drawer compartment. This clear lid provides visibility and
easy access to the compartment.
To remove the crisper lid assembly, pull the upper refriger-
ator drawer all the way out, raise the front edge of the
crisper lid up and pull out from the back. Refer to the illus-
tration below.
STORAGE DRAWER DIVIDERS
The PRO 48 refrigerator storage drawers give you full
access to food with adjustable and removable dividers.
The dividers are interchangeable between the upper and
lower refrigerator drawer. Two long dividers run the full
depth of the drawer, with shorter dividers that connect to
the long dividers to compartmentalize the drawer.
To remove the short dividers, lift up and out of position
from supports on the long dividers and sides of the
drawer. The long dividers can also be removed by lifting
up and out of position from drawer support tabs. Refer to
the illustration below.
Adjustable glass shelf. Adjustable slide-out bin. Storage drawer with crisper lid.

PRO 48 Use & Care 9
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Freezer Storage
AD USTABLE SHELVES
The adjustable shelves of the PRO 48 upper freezer
compartment are cantilevered and 100% stainless steel.
The freezer shelves are repositioned the same way as the
glass shelves in the refrigerator compartment. To remove
or adjust the freezer shelves, first tilt the shelf up at the
front, then lift it up and out of the tracks on the rear wall of
the freezer.
To replace a shelf, insert in the tracks on the rear wall of
the freezer with the front of the shelf raised slightly. As you
push the shelf in, lower the front of the shelf until it locks
into position.
ICE BUCKET REMOVAL
The automatic ice maker and stainless steel ice bucket are
located in the lower freezer drawer.
To remove the ice bucket, pull the freezer drawer out until
it stops, lift the ice bucket up and out of the drawer. The
entire lower freezer drawer can now be used for more ice
storage if necessary.
Storage Drawers
DRAWER REMOVAL
The refrigerator and freezer storage drawers are remov-
able for cleaning. The drawers have an automatic stop
built in to prevent drawers from coming all the way out of
the unit.
To remove, pull the drawer all the way out until it stops, lift
up evenly on both sides of the drawer front and pull out.
To reinstall, raise the front of the drawer and place onto
the drawer slide tracks. Be sure to engage the front of
the drawer slide with the drawer assembly. Refer to the
illustration below.
IMPORTANT NOTE: To reduce the weight of the drawer, be
sure to unload the contents before removing the drawer.
Storage drawer removal.
Storage drawers are heavy. Be sure to keep your feet
clear as you remove the drawer.

PRO 48 Use & Care 10
Water Filtration System
The PRO 48 features a water filtration system that
supplies filtered water to the ice maker to produce great-
tasting ice. The water filter has been factory installed
behind the grille assembly.
It is important that the operation, maintenance and filter
replacement requirements be carried out as scheduled.
Refer to the following information on the water filter
cartridge monitor.
IMPORTANT NOTE: If the unit has been turned off or the
ice maker disabled for one month or longer, the water filter
cartridge should be replaced once the unit and ice maker
are back in operation.
IMPORTANT NOTE: Do not use with water that is microbi-
ologically unsafe or of unknown water quality without
adequate disinfection before or after the system. Systems
certified for cyst reduction may be used on disinfected
waters that may contain filterable cysts.
Refer to the performance data on page 25 for additional
information regarding the water filtration system.
WATER FILTER CARTRIDGE MONITOR
The water filter cartridge is designed to last for up to one
year of continuous use of the ice maker. The electronic
control system monitors the life of the water filter cartridge
and indicates when it needs to be replaced. An indicator
that reads ‘R PLAC FILT R’ will be visible in the left
side exterior temperature display. Follow steps to replace
the water filter cartridge on the following page.
Once the filter cartridge has been replaced, the control
automatically resets the water filter life monitor and the
‘R PLAC FILT R’ indicator will no longer be displayed.
Although it is designed to last for up to one year of use,
the actual life of the filter cartridge may vary with water
supply conditions. Therefore, it is recommended that the
filter cartridge be replaced when the ‘R PLAC FILT R’
indicator is displayed or if the ice cubes become hollow or
smaller.
IMPORTANT NOTE: The warranty for the water filter
cartridge supplied with the unit only covers defects in
materials or workmanship and not replacement due to
normal use.
REPLACEMENT CARTRIDGES
Replacement Sub-Zero water filter cartridges can be
ordered online at subzerowolfstore.com. For questions,
contact Sub-Zero customer care at 800-222-7820.