Product Operation; Theory Of Operation - KitchenAid KBFC42FS Technical Education

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OVERVIEW
The KitchenAid Built-In French Door Bottom-
Mount Refrigerator Constant Flow Temperature
Management System uses two thermistors
to monitor temperature changes inside the
refrigerator and freezer compartments. Two
electronic control boards are used in the re-
frigerator: a main electronic control board,
and a low voltage (Phoenix) board. The main
electronic control board manages the operation
of the variable capacity compressor (VCC), a
variable speed evaporator fan motor, and a
variable position air door. The air door allows
independent temperature control of the refrig-
erator and freezer compartments.
The main electronic control board seeks the
most efficient means possible to maintain
temperatures as it controls the operation and
speed of the compressor and the evaporator
fan motor. Higher fan speed is used before
increasing the compressor speed to minimize
power consumption. A nearly constant run
time is sought at the lowest possible fan and
compressor speed.
Freezer temperatures can be set from 5°F
to –5°F (–15°C to –21°C). Refrigerator tem-
peratures can be set from 45°F to 33°F, (7°C
to 1°C).
The Adaptive Defrost Control (ADC) portion
of the main electronic control board utilizes
"pulsed defrost" technology to perform the
defrost function (see page 3-4).

PRODUCT OPERATION

THEORY OF OPERATION

THE ELECTRONIC CONTROL PANEL
The main electronic control board monitors the
water valve for total elapsed time and gallons
of water used. The number displayed on the
Water Filter Indicator (WFI) is the percentage
of filter usage remaining.
The numeric display can be set for Fahrenheit
or Celsius and displays the actual temperatures.
The display range for the refrigerator is from
27°F to 70°F (–2.8°C to 21°C). The normal
freezer display range is from –10°F to 70°F
(–23°C to 21°C). Temperatures above or below
these limits will be displayed at the correspond-
ing temperature limit. During Max Cool, the
freezer display will read –5°F (–21°C), and the
refrigerator will read 34°F (1°C).
The display will show the temperature setting
any time the actual temperature is within ±6°F
of the customer setting. This will prevent con-
cern over temperature fluctuations when the
doors are opened. The customer setting will
also be displayed during the defrost period,
and 30 minutes after defrost. Press the tem-
perature adjustment key to view the current
temperature setting, or to change the setting.
When the temperature adjustment key is used
to change the temperature setting, the display
will brighten for 5 seconds.
Available features include:
• Water Filter Indicator
• Max Cool
• Over-Temperature Alarm
• Holiday Mode
• Energy Saver Mode
3-1
Max Cool Holiday Mode Energy Saver