Bin Thermostat - Ice-O-Matic UCG 45 Installation And Service Manual

On UCG45/65/85105 when the temperature of the evaporator thermostat bulb reaches the value of +3
4C their electrical contacts move back to the previous position activating a new freezing cycle and
deenergizing both the hot gas and the water inlet valves (closed). On UCG135/165 as soon as the timer
completes the bottom part of the cam and it is pushed again, it activates a new freezing cycle
deenergizing both the hot gas and the water inlet valves (closed).
NOTE. On models UCG45,65,85 and 105 the length of the defrost/harvest
cycle (not adjustable) changes according to the ambient temperature
(shorter for hi ambient temperature and longer for low one).
COMPONENTS DESCRIPTION
WATER PUMP
The water pump operates continually throughout the freezing cycle. The pump primes the water from
the sump to the spray system and through the spray nozzles sprays it into the inverted cup molds to be
frozen into crystal clear ice cubes.
WATER INLET SOLENOID VALVE ‐ 3/4 MALE FITTING
The water inlet solenoid valve is energized only during the defrost cycle.When energized it allows a
metered amount of incoming water to flow over the evaporator cavity to assist the hot gas in defrosting
the ice cubes. The water running over the evaporator cavity drops by gravity, through the dribbler holes
of the platen, into the sump reservoir. On UCG45/65/85/105/135 water cooled versions the water inlet
solenoid valve has one inlet and two outlets with two separate solenoids energized the first (ice
production) by the contacts 3‐2 of the evaporator thermostat and the second (water cooled condenser)
by a specific hi pressure control.
HOT GAS SOLENOID VALVE
The hot gas solenoid valve consists basically in two parts: the valve body and the valve coil. During the
defrost cycle the hot gas valve coil is activated so to attract the hot gas valve piston in order to give way
to the hot gas discharged from compressor to flow directly into the evaporator serpentine to defrost the
formed ice cubes.
BIN THERMOSTAT
The bin thermostat control body is located in the front of control box behind the front panel. The
thermostat sensing tube is located into a bulb holder on the side wall of the ice storage bin where it
automatically shuts the icemaker OFF when in contact with the ice and re‐starts the icemaker when the
ice is removed. Factory settings are 1C (35F) OUT and 4C (39F) IN.
CUBE SIZE CONTROL (EVAPORATOR THERMOSTAT)
The cube size control (evaporator thermostat) body is located in the control box behind the front panel;
it's basically a reverse acting temperature control which closes the contacts 3‐2 when its temperature
decreases and closes the opposite contacts 3‐4 when the temperature rises.
The thermostat sensing bulb is located into a plastic tube (bulb holder) secured by two clips directly to
the evaporator serpentine. This control determines the length of the freezing cycle and correspondingly
UCG GOURMET SERIES UNDERCOUNTER
pg. 13