Scotsman TCL 180 Service Manual page 8

Page 8
FIG. 4
E. Check for the correct CUT-OUT and
CUT-IN of the float reservoir water level sen-
sors by shutoff the valve on the water supply
line.
This will cause a gradual decrease of the water
level in the float reservoir and as soon as the
level gets below the sensors, the flaker stops to
operate and the 5thYELLOW warning LED will
glow to signal the shortage of water (Fig.5).
FIG. 5
NOTE. The water level sensor detects the
presence of sufficient water in the float
reservoir and confirms it to the micro
processor by maintaining a low voltage
current flow between the two sensors using
the water as conductor.
WARNING. The use of de-mineralized
water (water with no salt content) having
an electrical conductivity lower than 30
µS, will cause the ability of the water
sensors to vanish with the consequent
CUT-OUT of the flaker operations and the
glowing of the YELLOW LED of shortage
of water, even though that water is indeed
in the reservoir.
STEADY
TOO HI CONDENSING TEMPERATURE
NO WATER
After this, open the water supply line shutoff
valve to fill up again the float reservoir, the 5th
YELLOW LED goes off while the 2nd RED LED
starts blinking.
After 3 minutes the unit resumes its total operation
with the immediate start-up of the gear motor
and, 2 seconds later, of the compressor.
F. Check for the correct operation of the
electronic eye for the ice bin level control, by
placing one hand between the sensing "eyes"
located in the ice spout, to interrupt the light
beam.
This interruption will cause an immediate blink of
the 1st YELLOW LED and after about 6 seconds
causes the shutoff of the unit with the simulta-
neous lighting of the same YELLOW LED
signalling the full bin situation (Fig.6).
Allow the resumption of the light beam previously
interrupted and after about 6 seconds with
YELLOW LED blinking fast, the flaker will resume
- through the 3 minutes STAND-BY period - the
ice making process with the extinguishing of the
YELLOW LED.
BLINKING - FLASHING SLOW
INFRARED BEAM CUTTED WITH MACHINE IN OPERATION
STEADY
MACHINE OFF AT BIN FULL
BLINKING - FLASHING FAST
INFRARED BEAM ON AFTER THE TRIPPING OFF AT BIN FULL
NOTE. The ICE LEVEL CONTROL (INFRA-
RED SYSTEM) is independent of the tempe-
rature however, the reliability of its detection
can be affected by dirt and scale sediment
which may deposit directly on the light source
and on the receiver.
To prevent any possible ice maker
malfunction, due to negative affection of the
light detector, it is advisable to follow the
instructions for the periodical cleaning of
the light sensor elements as detailed in the
MAINTENANCE AND CLEANING PRO-
CEDURES.
G. SETTING OF THE DISPENSING
SELECTOR
Setting of the dispensing time
It's possible to modify the dispensing time to 1.5,
3, 5 or 10 seconds.
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FIG. 6