Operational Cycles - Sub-Zero Wolf 506UI Service Manual

Theory of Operation

Operational Cycles

There are three operational cycles of the ice maker:
1. ICE MAKING cycle
2. HARVEST cycle
3. CLEAN cycle
In addition, there are two operational OFF cycles of the
ice maker:
1. OFF cycle when bin is full of ice and service control
switch is turned to the "ON" position.
2. OFF cycle when the service control switch is turned
to the "OFF" position while power is still supplied to
the unit.
When the ice makers service control switch is in the
"ON" position, and the bin is not full of ice, the evapora-
tor thermostat determines whether the unit will be in the
ICE MAKING cycle or the HARVEST cycle.
The thickness control knob adjusts the evaporator ther-
mostat to sense different temperatures on the evapora-
tor freezing plate, which causes a different thickness of
ice.
ICE MAKING Cycle
In the electronic system, power is supplied through the
service control switch to the transformer, (which also
supplies power to the cutter grid and bin light through
the door switch), and through the bin thermostat to the
compressor. (See Figure 3-14)
Power is supplied through the evaporator thermostat to
the condenser fan and the water pump.
If an FSP condensate pump is installed on the unit,
power is supplied to the condensate pump through the
receptacle. The condensate pump operates when
needed through a pressure switch in the pump itself.
(See Figure 3-15)
#3752200 - Revision B - May, 2006
Model 506 (UC Ice Maker)
Model 506 (UC Ice Maker)
2
OFF F F
CLEAN
ON 3 SERVICE
SWITCH
BIN
THERMO-
STAT
1
2 2
EVAPORATOR
THERMOSTAT
OVERLOAD
CUTTER GRID
Figure 3-14. Ice Making Cycle
2
OFF F F
CLEAN
ON 3 SERVICE
SWITCH
BIN
THERMO-
STAT
1
2 2
EVAPORATOR
THERMOSTAT
OVERLOAD
TRANSFORMER
CUTTER GRID
Figure 3-15. Ice Making with FSP Pump
3-8
115
60 HERTZ
VOLTS
L
N
1
WATER
PUMP
6
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
N.C.
WATER
3
SHUNT VALVE
SOLENOID
R R
S
COMPRESSOR
TRANSFORMER
START RELAY
115 V
8.5 V
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN "ON" POSITION;
BIN NOT FULL OF ICE; NO DRAINAGE
WATER AT PUMP.
DOOR SWITCH
115
60 HERTZ
VOLTS
L N
1
WATER
PUMP
6
CONDENSER
FAN
RECEPTACLE
HOT
N.C.
GAS SOLENOID
N.C.
WATER
3
SHUNT VALVE
SOLENOID
R R
S
COMPRESSOR
START RELAY
115 V
8.5 V
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN "ON"
POSITION; BIN NOT FULL OF ICE;
DRAINAGE WATER AT PUMP; IN ICE
DOOR SWITCH
MAKING CYCLE.
R
PLUG
R
PRESSURE
SWITCH
CONDENSATE
DRAIN PUMP