Sub-Zero BI-36R Use & Care Manual page 23

Built-In Use & Care
Operations
CONDENSER FAN MOTOR
All built-in models have a fan behind the grille to cool the
compressor area. This fan runs with either compressor.
AUTOMATIC DEFROST
Your Sub-Zero unit is equipped with an automatic defrost
system. The refrigerator section will defrost during each
off cycle of the refrigerator compressor. The freezer
section is controlled by an energy-saving adaptive defrost
system, which defrosts as needed.
Sounds
You may hear some noises in the normal operation of the
unit. Surrounding acoustics like walls, floors and cabinets
may affect the sound of your unit. For example, a gurgling
or running water sound is probably refrigerant circulating
through the tubing. In models BI-42SD and BI-48SD, the
ice dispenser motor inside the refrigerator door closes five
seconds after either the ICE or WATER key pad is
released.
During the ice maker cycle you may hear the sound of ice
dropping into the container or the water valve operating
while refilling the ice maker with water. During the freezer
defrost you may hear crackling or sizzling as the heat from
the defrost element clears the frost from the freezer coil
and water runs into the water pan.
While the compressors are in operation, you may hear a
slight hum. During the start-up and shutdown of the
compressor, you may feel vibration for a few seconds.
Some of these noises may be enhanced when the unit
door(s) are open.
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