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November 1996 29 RS1200001
Electronic Functional Description
Operation
Program mode has 2 submodes, Mode A and
Mode B. Access to either mode is toggled with
Display On pad. Entry in program Mode A is indicated
with unmarked light glowing. Control is in program
Mode B if light does not glow.
Mode A Functions - Freezer or Refrigerator
Temperature
1. Choose freezer thermistor temperature display by
pressing Freezer Temp pad. Freezer temp
indicator light will glow. Temperature display will
show thermistor temperature in binary coded
decimal (BCD) format. Indicator lights 1 through 4
represent tens digit with 1 being most significant
bit. Indicator lights 5 through 8 represent ones digit
with 5 being the most significant bit. Indicator light
9 (coldest is + - sign; light glows signifying
negative value).
2. Choose refrigerator thermistor temperature display
by pressing Ref Temp pad. Refrigerator
temperature indicator light will glow. Temperature
display will show thermistor temperature in BCD as
described above.
Electronic control value column is calculated in units
of °F. Conversion is °C = (°F - 32)/1.8.
Mode B Functions
1. Door alarm delay can be adjusted from keyboard
when in this mode. Press Alarm Off pad, door
open indicator will glow. One temperature
indicator should glow indicating present delay time
setting. Pressing Warmer pad decreases delay by
1 and pressing Colder pad increases delay by 1.
Delay times selected go from 1 to 9 minutes in 1
minute increments.1 being 1 minute and 9 being 9
minutes. Default door audio delay is 3 minutes.
2. Max Ref run time duration adjustment can be
performed in Mode B by pressing Max Ref pad.
Max Ref light will glow. One temperature indicator
should glow indicating present Max Ref run time
duration. Pressing Warmer pad decreases Max
Ref run time by 2 hours and pressing Colder pad
increases by 2 hours. Times are from 6 hours
(indicated by 1 temperature indicator) to 22 hours
(indicated by coldest temperature indicator).
Default Max Ref run time is 10 hours.
3. Max Frz run time duration adjustment can be
performed by pressing Max Frz pad in
Mode B. Max Frz indicator will glow. Adjustment
process is same as items 1 and 2. Duration times
are in increments of 4 hours, ranging from 8 hours.
1 setting to 40 hours at coldest setting. Default
Max Frz run time duration is 24 hours.
4. Refrigerator temperature offset is calibration
adjustment. Temperatures at which refrigerator
cuts-in and cuts-out are shifted by amount offset is
set. Pressing Ref Temp pad while in Mode B
causes refrigerator indicator to glow and 1 of 9
temperature indicators to glow. Pressing Warmer
pad or Colder pad moves offset up or down range.
Temperature indicators and offsets and what they
imply are shown on chart below. The low voltage
board freezer offset temperature is 0 and
refrigerator offset temperature +2 from factory.
5. Enable freezer temperature offset by pressing
Freezer Temp pad in Mode B. Freezer indicator
will glow. Adjustment process, set point values, is
identical to item 4.
INDICATOR OFFSET
1 +8
2 +6
3 +4
4 +2
5 0
6 -2
7 -4
8 -6
Coldest -8