
6
DUAL REFRIGERATION SYSTEM
The PRO 48 continues the Sub-Zero tradition
of superior quality and reliability. Sub-Zero
pioneered the development of our exclusive
dual refrigeration systems, giving you
optimum fresh and frozen food storage in ideal
self-contained compartments. 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
consistent temperature within one degree of
the temperature you set within our range of
-5°F (-20°C) to +5°F (-15°C), without unwanted
moisture and odor from the refrigerator. Simi-
larly, you can adjust the refrigerator tempera-
ture within a range of 34°F (1°C) to 45°F (7°C),
for proper humidity levels tailored for longer
food life expectancy.
Dual refrigeration also means there is no
transfer of fresh food odors to frozen food or
ice. The PRO 48 system does not freeze the
moisture out of the air in the fresh food
compartments.
The Sub-Zerodual refrigeration system is
moreenergy efficient than standard 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.
ELECTRONIC 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 opera-
tion 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.
TEMPERATURE CONTROL
Your new PRO 48 was thoroughly inspected
and tested before it was shipped from the
Sub-Zero factory. Temperatures are preset at
38°F(3°C) in refrigerator compartments and
0°F(-18°C) in the freezer compartments.
There are three sets of
WARMER
and
COLDER
key pads on the interior control panel, two for
the refrigerator compartments (upper door and
lower drawers) and one for the freezer
compartments. Toadjust the temperaturein
any of the three compartments, depress the
WARMER
or
COLDER
key pad for that
compartment. Digital temperatures 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 refrigerator 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 compartments to reach the temperature
you set.
SUB-ZERO PRO 48 USE & CARE
PRO 48 interior control panel
Model 648PROG shown
Freezer
Temperature Controls Ice Maker
On/Off Power
On/Off Alarm
On/Off Lights
On/Off Refrigerator
Temperature Controls
Upper
Compartment Drawer
Compartments