Monitor And Control Off-Cycle Defrost; Off-Cycle Defrost Signal Trace - Sub-Zero 424HAG/O-2 Service Manual

Electronic Control System

Monitor and Control Off-cycle Defrost

Since High Offset (Cut-in) is governed by the evaporator temperature, the refrigeration system cannot be energized
until evaporator temperatures exceed 39°F / 4°C, with a 38°F/3°C set-point, and/or exceed 66°F / 19°C, with a
65°F/18°C set-point.
CONTROL
BOARD
DISPLAY
#3758410 - Revision C - May, 2014
L1 NEUT
115 VOLTS
60 CYCLES
J1 1
J8 J2
8
1
2
WINE
BLUE
J3
PINK
14
E2
E1
E3
BLACK
LOW VOLTAGE
MEMBRANE SWITCH
J1
J8 J2
1
2
WINE
J3
CONTROL
BOARD
14
Figure 3-18. Off-cycle Defrost Signal Trace
Wine Storage
Wine Storage
WHITE
ORANGE
N.C.
BROWN
ORANGE
PINK PINK
N.O.
BLUE BLUE
N.O.
TAN
Refrigeration system not energized;
evaporators defrost
OVERLOAD PROTECTOR
GRAY
WHITE
1
BLUE W/WHITE
BLUE W/WHITE
BLUE W/BLACK
BLUE W/BLACK
BLUE W/RED
ORANGE W/RED
BLUE W/YELLOW
ORANGE W/YELLOW
8
WHITE W/RED
WHITE W/BLUE
GRAY W/WHITE
E2
E1
E3
3-12
Series
Series
2
2
(400- )
(400- )
LIGHTS
LIGHTS
UPPER
M
EVAPORATOR FAN MOTORS
LOWER
M
AWECO REF VALVE
680 Ω
CONDENSER FAN MOTOR
M
COMPRESSOR
STARTING RELAY
M
COMPRESSOR
THERMISTER 1
LOWER CABINET
THERMISTER 2
UPPER CABINET
THERMISTER 3
LOWER EVAPORATOR
THERMISTER 4
UPPER EVAPORATOR
No cooling called for