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Theory of Operation
Model 506 (UC Ice Maker)
Model 506 (UC Ice Maker)
3-10
#3752200 - Revision B - May, 2006
OFF Cycle when the bin is full of ice and the service
control switch is in the “ON” position
In the electrical system, when the bin thermostat sens-
es the bin is full of ice, power is cut off to all of the elec-
trical system except for the transformer, cutter grid, bin
light and door switch.
If an FSP condensate pump is installed, power will also
be supplied to the condensate pump through the recep-
tacle.
The pump will operate when needed through a pres-
sure switch in the pump itself.
The refrigeration system and the water system do not
operate when the bin is full of ice.
2
1
6
3
ON
OFF
CLEAN
SERVICE
SWITCH
115
VOLTS
60 HERTZ
N
L
WATER
PUMP
CONDENSER
FAN
START RELAY
COMPRESSOR
S
R
RECEPTACLE
HOT
GAS SOLENOID
N.C.
N.C.
WATER
VALVE
SOLENOID
EVAPORATOR
THERMOSTAT
2
3
1
BIN
THERMO-
STAT
OVERLOAD
TRANSFORMER
115 V
8.5 V
DOOR SWITCH
CUTTER GRID
UNIT SHOWN WITH GRAVITY DRAIN;
SERVICE SWITCH IN “ON” POSITION;
BIN FULL OF ICE.
SHUNT
2
F
F
R
Figure 3-18. Off Cycle, Switch ON
2
1
6
3
ON
OFF
CLEAN
SERVICE
SWITCH
115
VOLTS
60 HERTZ
N
L
WATER
PUMP
CONDENSER
FAN
START RELAY
COMPRESSOR
S
R
RECEPTACLE
HOT
GAS SOLENOID
N.C.
N.C.
WATER
VALVE
SOLENOID
EVAPORATOR
THERMOSTAT
2
3
1
BIN
THERMO-
STAT
OVERLOAD
TRANSFORMER
115 V
8.5 V
DOOR SWITCH
CUTTER GRID
UNIT SHOWN WITH FSP CONDENSATE;
PUMP; SERVICE SWITCH IN “ON”
POSITION; BIN FULL OF ICE;
DRAINAGE WATER AT PUMP.
F
F
R
PLUG
PRESSURE
SWITCH
CONDENSATE
DRAIN PUMP
Figure 3-19. Off Cycle with FSP PUMP