Sub-Zero 700-3 BASE Technical & Service Manual page 28

Electronic Control System
Monitor Compressor Run Duration, Displays If Service is Needed
The microprocessor observes the state of the compressor relay to determine the length of compressor run time (See
Figure 3-22). If the compressor runs 100% (Freezer = 6 hours, Refrigerator = 4 hours), an error code is logged (EC
40), and defrost will be initiated, but SERVICE will not flash.
If several 100% compressor run periods occur, and a drawer was not opened during the last excessive compressor
run period, and the temperature in the zone is not able to fall half way between the set point and the low off-set,
then SERVICE will flash (See Figure 3-23).
NOTE: To clear a flashing SERVICE and error codes, the problem must be corrected, then the Alarm ON/OFF key
pressed for 15 seconds. Failure to clear an error code will cause SERVICE to display constant.
NOTE: If the unit is ever switched OFF then back ON, the compressor will not energize for at least 3 minutes. This
3 minute minimum OFF time is used to protect the compressor and its electricals.
HIGH VOLTAGE SCHEMATIC
1. Compressor relay closed,
allowing 115 Volts AC to
compressor. This is
observe by microprocessor.
J6
J5
Figure 3-22. 700BCI-3 Signal Trace Schematic - Compressor Run
SERVICE
Figure 3-23. Service Flashing if several 100% compressor run periods occurred, a drawer was not opened
during last excessive run period, and temperature is not able to fall half way between set point & low off-set.
#3758424 - Revision B - December, 2005
115 VOLTS
60 CYCLES
L1
J2
WHITE
P4
PIN 1
BLACK
P3
MAIN BOARD
P1
BLUE
P2
PIN 1
J4
PIN 1
PIN 1
PIN 1
J3
FREEZER
Integrated
(700-
NEUTRAL
WHITE
OVERLOAD
PROTECTOR
PURPLE
M
CONDENSER FAN
RED
TERMINATOR
COLDER WARMER COLDER WARMER
3-16
3 Series
BASE)
WHITE
M
RUNNING
CAPACITOR
(WHEN
USED)
COMPRESSOR
COMPRESSOR
STARTING
M
RELAY
M
FRZ FAN MOTOR
ICE
REFRIGERATOR
ON/OFF
ON/OFF
UNIT
ON/OFF