Freezing Cycle - Ice-O-Matic UCG 45 Installation And Service Manual

UCG GOURMET SERIES UNDERCOUNTER
FREEZING CYCLE
The hot gas refrigerant discharged out from the compressor reaches the condenser where, being cooled
down, condenses into liquid. Flowing into the liquid line it passes through the drier/filter, then it goes all
the way through the capillary tube where it looses its pressure. Next the refrigerant enters into the
evaporator serpentine (which has a larger diameter then the capillary tube) and starts to boil off; this
reaction is emphasized by the heat transferred by the sprayed water. The refrigerant then increases in
volume and changes entirely into vapor.
The vapor refrigerant then passes through the suction accumulator (used to prevent that any small
amount of liquid refrigerant may reach the compressor) and through the suction line. In both the
accumulator and the suction line it exchanges heat with the refrigerant flowing into the capillary
tube
warmer), before to be sucked in the compressor and to be recirculated as hot compressed refrigerant
(
gas.
The freezing cycle on UCG45/45/65/85/105 is controlled by only the evaporator thermostat which has
its bulb in contact with the evaporator serpentine while in UCG135/165 there is an second phase
controlled by a timer.
The electrical components in operation during the freezing cycle are:
COMPRESSOR
WATER PUMP
FAN MOTOR (in air cooled version)
On UCG45/65/85 air cooled versions the refrigerant head pressure is gradually reduced from a value of
approx.11 bars (155 psig) at the beginning of the freezing cycle with the unit at 21C (70F) ambient
temperature, to a minimun value of approx.7 bars (100 psig) just at the end of the freezing cycle few
seconds before the starting of the defrost cycle.
pg. 11