Wolf Sub-Zero ICB400 Series Service Manual page 44

International W
International W
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
Figure 3-57). If the compressor runs 100% (4 hours), an error code is logged (EC 50), and defrost will be initiated,
but SERVICE will not flash.
If several 100% compressor run periods occur, and a drawer is not opened during the last excessive compressor run
period, and the temperature in the zone is not able to fall half way between set-point and low off-set, then SERVICE
will flash (See Figure 3-58).
NOTE: To clear an error code, the problem must be corrected, then the ALARM key pressed for fifteen (15) sec-
onds. Failure to clear an error code will cause SERVICE to display constant.
NOTE: If the unit is ever switched OFF then immediately 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
ORANGE
J2
J6
MAIN
J4
BOARD
J5
SERVICE
Figure 3-58. 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.
ine Storage
ine Storage
Compressor relay closed, allowing 230 Volts AC to
compressor. This is observe by microprocessor.
NEUTRAL WHITE
WHITE
P4
BLACK BLACK
PURPLE
P3
PURPLE
P1
BLUE
P2
RED
J3
6 5 4
1 3
DPDT RELAY
NEUTRAL WHITE
ORANGE
Figure 3-57. Signal Trace Schematic - Compressor Run
Series
Series
(ICB400)
(ICB400)
L1 NEUT
230 VOLTS
50/60 CYCLES
OVERLOAD
PROTECTOR
RED
DOOR SWITCH
YELLOW
DOOR SWITCH
ORANGE
3-31
Electronic Control System
NEUTRAL WHITE
CONDENSER FAN MOTOR
M
2000 Ω
MULLION HEATER
COMPRESSOR
STARTING RELAY
M
COMPRESSOR
EVAPORATOR FAN MOTOR
M
TOP DRAWER LIGHTS
LOWER DRAWER LIGHTS
7011544 - Revision A - November, 2008
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