Operational Checks - Scotsman TC 180 Service Manual

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NOTE. If, after ten minutes from the
compressor start-up, the evaporating tem-
perature has not dropped down to a value
° °
lower than -1 C (30 F) the evaporating tem-
perature sensor detects such an abnormal
situation and stops consequently the unit
operation.
In this circustance, the 3rd warning YELLOW
LED will blink (Fig.3).
After having diagnosed and eliminated the
cause of the poor evaporating temperature
(insufficient refrigerant in the system or
inoperative compressor or evaporator sensor)
it is necessary to push the RE-SET BUTTON
that protrudes through the hole of the control
box cover.
The unit, before resuming the total operation,
will go through the usual 3 minutes STAND-
BY period.
FIG. 3
FIG. 4
OPERATION CHECKS UPON THE UNIT
START UP
D. Remove service panels and if necessary
install the refrigerant service gauges on the
corresponding Service valves to check both the
HI and LO refrigerant pressures.
NOTE. The condenser temperature sensor,
which is located within the condenser fins,
keeps the head (condensing) pressure
between two preset valves.
In case of condenser clogging such to prevent
the proper flow of the cooling air or, in case
the fan motor is out of operation, the
condenser temperature rises and when it
° °
reaches 70 C (160 F) the condenser tempe-
rature sensor shuts-off the ice maker with the
consequent light-up of the 2nd RED
WARNING LIGHT (Fig.4).
After having diagnosed the reason of the
temperature rise and removed its cause, it is
necessary to proceed as per the previous
"NOTE" to start up again the operation of the
ice maker.
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