Ice-O-Matic Gourmet UCG Series Installation And Service Manual page 11

G. After about 17-20 minutes from the beginning of the freeze cycle, in a hypothetical ambient
temperature of 70˚F (21˚C), the defrost cycle takes place with the hot gas, the water inlet, and the
water drain valves simultaneously activated (Fig. 5). The electrical components in operation on these
models are the compressor, water inlet valve, hot gas valve, water drain valve, and the water pump
in the first 15 seconds.
NOTE: The length of the defrost cycle is automatically determined by the PC Board in
relation of the time necessary for the unit to reduce the evaporator temperature from 32˚F
(0˚C) small red LED blinking to 5˚F (-15˚C) small red LED ON steady - time T2. It is possible to
extend the length of the defrost cycle by changing the setting of the dip switch 7 and 8 as
shown on the table on page 22.
H. Check, during the defrost cycle, that the incoming water flows correctly into the sump reservoir in
order to refill it and that the surplus overflows through the overflow drain tube.
I. Check the texture of ice cubes just released. They have to be in the right shape with a small depression
of slightly less than ¼" (about 5-6mm) in their crown. If not, wait for the completion of the second
cycle before performing any adjustment. If the ice cubes are shallow and cloudy, it is possible that
the ice maker runs short of water during the freeze cycle second phase or, the quality of the supplied
water requires the use of an appropriate water filter.
J.
As soon as the water into the sealed water reservoir reaches the maximum level, the two metal pins
close the electrical contact through the water, transmitting a low voltage current to the PC Board.
The PC Board activates the water drain pump for 8 seconds pumping out most of the water contained
into the sealed water reservoir.
UCG GOURMET SERIES UNDERCOUNTER
pg. 11