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Built-In (BI) Series
Built-In (BI) Series
Monitor, Regulate and Display Refrigerator Compartment Temperatures
The temperature signal from the refrigerator compartment thermistor is monitored by the microprocessor. When
high offset temperature is detected, calling for cooling, a high-speed run command is sent to the refrigerator evapo-
rator fan, switching it ON, and when the evaporator temperature climbs to 38°F (3°C) the compressor is also ener-
gized, beginning the cooling cycle. When the compartment reaches low offset temperature, the compressor and fan
are switched OFF. Though compartment air temperature fluctuates from OFF and ON cycles, it is the refrigerator
compartment's "average" temperature that is displayed at the right side of the LCD. (See Figure 2-39)
NOTES:
• Refrigerator zone tempera-
ture range is +34°F (+1°C) to
+45°F (+7°C).
• If average compartment tem-
perature changes, the display
will change by one degree
per minute.
• If the refrigerator compart-
ment thermistor is faulty, the
refrigerator compressor
defaults to 20 minutes ON,
40 minutes OFF cycling, EE
appears at right in LCD, the
service icon flashes and the
appropriate fault code is
logged.
• If the refrigerator evaporator
thermistor is faulty, the refrig-
erator compressor will not
energize until compartment
air temperature exceeds high
offset by 5°F (3°C); the serv-
ice icon flashes and the
appropriate fault code is
logged.
• If in Sabbath Mode, the com-
partment thermistor still con-
trols compressor operation,
except that when high offset
is reached, there is a random
15 to 25 second delay before
the cooling cycle is started.
• The condenser fan is ener-
gized whenever a compres-
sor is energized.
(SWS #4380000)
(SWS #4380000)
HIGH VOLTAGE
1 NEUTRAL
4 L1
6 L1
1 MAIN LIGHTS
3 COMP 1
5 COMP 2
8 DEFROST HTR
9
1
6
1
LOW VOLTAGE
1 NEUTRAL
4 L1
6 L1
1 MAIN LIGHTS
3 COMP 1
5 COMP 2
8 DEFROST HTR
Average temp.
displayed at
right of LCD
EXTERNAL
DEVICE
KEYPAD
Figure 2-39. Signal Trace Schematic: Regulating Refrigerator Temperature
5. Condenser fan
energized
4. Compressor ener-
gized
1
17
1
6
1
16
1. High offset temperature detected
2-23
Electronic Control
660 Ω
160 Ω
2300-2900 Ω
27.9-30.9 Ω
2. Run command
sent to evapora-
tor fan
3. Ref. evapora-
tor above 38°F
(3°C)
7040317 - Revision A - September, 2015
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