Scotsman DXN 207 Service Manual page 17

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function normally. To reset the remind, go into
alarm (by pressing the ALARM key for 5'') and
while displaying the "CLE" condition simply press
the ALARM button for more than 5''. The
completion of the reset signal is confirmed by 3
flashes of "rES" on display.
ALARM CONDITION
All the alarm codes are signaled by the ALARM
key; push it for more than 5 seconds to turns ON
the display, which shows the code alarm in
progress.
The alarm codes are the following:
Alarm
No Water
Evaporator Sensor out of order
Condenser Sensor out of order
Optical dispensing Sensor out of order (ICE)
Optical dispensing Sensor out of order (WATER)
Too High Evaporator Temperature (> 0°C)
Too Low Evaporator Temperature (< - 30°C)
Too High Condensing Temperature (> 70°C)
Too Low Condensing/Ambient Temperature (<3°C)
No /Wrong Rotation Alarm
Too High Condensing Temperature at start-up ( > 55°C)
Test Alarm
Ice level control out of order
Cleaning Remind (6 months)
After 5'' the display will turn off and only the keys
of the standard operation will remain lighted .
H. P.C. BOARD
THE P.C. BOARD, fitted in its galvanized steel
box located in the right side of the unit, consist of
two separated printed circuits one at high and the
second at low voltage protected by a fuse.
It also consists of 3 aligned LEDS monitoring the
operation of the machine and of input terminals
for the leads of the sensor probes as well as input
and output terminals for the leads of ice maker
electrical wires. The P.C. BOARD is the brain of
the system and it elaborates, through its
microprocessor, the signals received from the
sensors in order to control the operation of the
different electrical components of the ice
dispenser ( compressor, gear motor, fan motor,
water valves, dispensing devices).
The three LEDS, placed in a row in the center of
the P.C. BOARD, monitor the following situations:
Green ON/OFF = Power ON or OFF
Green LINK = Normally ON; detects the
connection with the control panel interface board
Red ALARM = Normally OFF; will be ON in case
of any alarm
I. FLOAT RESERVOIR
The float reservoir consists of a plastic water pan
on which is fitted a float valve with its setting
screw. The float valve modulate the incoming
Code
water flow to maintain a constant water level in
A01
the reservoir, level that corresponds to the one in
the freezing cylinder to ensure proper ice
A02
formation and fluidity.
A03
On the inner side of the reservoir cover are fitted
A04
the two water level sensors which detects the
A05
presence or the shortage of water in the reservoir.
A06
A07
NOTE. It is very important to make sure of
the correct fitting of the cover on the reservoir
A08
in order to enable the sensor to efficiently
A09
control the water situation avoiding undue
A10
shutoff interventions.
A11
A14
A15
J. FREEZING CYLINDER (EVAPORATOR)
CLE
The freezing cylinder is made of a stainless steel
vertical tube with an inner evaporating chamber
and in its interior is located the auger which
rotates on its vertical axis and it is maintained
aligned by the top permanently lubricates
bushings. A water seal system is located in the
bottom part of the freezer.
The water constantly flowing into the cylinder
bottom part, freezes into ice when in contact with
the cylinder inner walls. The ice is then lifted up
by the rotating auger and compacted and forced
out by the ice breaker.
K. ICE BREAKER
The ice breaker is made by several rectangular
openings where the ice is forced to pass
through.
By undergoing this, the ice looses its excess of
water content so it drops into the bin in hard dry
bits of ice.
L. DRIVE GEAR MOTOR
This motoreducer is made of a single phase
electric motor with permanent capacitor directly
fitted on a gear box.
The drive motor rotor is kept aligned on its
vertical axis by two ball bearings permanently
lubricated. The gear case contains a train of
three spur gears the first one of which is in fiber
to limit the noise level. All the three gears are
encased in case bearings and are covered by
lubricant oil.
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