Functions Of Electronic Control System; Display Zone Temperatures; Supply Power To Lighting System - Sub-Zero 700-3 BASE Technical & Service Manual

Electronic Control System

FUNCTIONS OF ELECTRONIC CONTROL SYSTEM

The following few pages explain monitoring, regulating and controlling functions of the electronic control system.

Display Zone Temperatures

The temperature signals from the thermistors in the refrigerator and freezer compartments are monitored by the
microprocessor and then displayed on the LCD. Though the compartment air temperature does fluctuate, the LCD
displays the average temperature (See Figure 3-17).
NOTE: If zone temperature changes, temperature display will change by one degree per minute.
Supply Power to the Lighting System
Power is supplied to the lighting system through the control board when the unit is switched ON by pressing UNIT
ON/OFF key. With a drawer open, the light switch allows power to the light. (See Figure 3-18).
NOTE: Power to the lights is monitored by the microprocessor to control the door ajar alarm feature and to help
control the operation of the evaporator fan and/or refrigerator compartment fan.
NOTE: When in Sabbath Mode, lighting system is disabled. Sabbath Mode will be covered later.
HIGH VOLTAGE SCHEMATIC
2. Light switch position monitored
for alarm and fan operation.
ORANGE
J6
J5
Figure 3-18. 700BCI-3 Signal Trace Schematic (High Voltage) of Lighting System
#3758424 - Revision B - December, 2005
FREEZER
Average temperature displayed
Figure 3-17. Display Zone Temperatures
115 VOLTS
60 CYCLES
L1
J2
WHITE
P4
PIN 1
BLACK
P3
MAIN BOARD
P1
1. 115 Volts are supplied to
lighting system unless
P2
PIN 1
unit is switched OFF, or
in Sabbath Mode.
J4
PIN 1
PIN 1
PIN 1
J3
ORANGE W/BLACK STRIPE
ORANGE
Integrated
(700-
COLDER WARMER COLDER WARMER
NEUTRAL
WHITE
M
ORANGE
REF LIGHT
REF (TOP)
SWITCH
DRAWER LIGHT
FRZ (BOTTOM)
FRZ LIGHT
SWITCH DRAWER LIGHT
3-10
3 Series
BASE)
ICE
REFRIGERATOR
ON/OFF
ON/OFF
WHITE
M
M
M
UNIT
ON/OFF