Scotsman DXN 107, Руководство по обслуживанию

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Page 12
Page 12
When the opposite situation occures, i.e. the
condenser temperature gets below the pre-fixed
limit, the temperature sensor changes again its
electrical resistance reducing therefore the
current flow to the P.C. Board to cause a tempo-
rary stop of the Fan Motor.
NOTE. In case the condenser temperature
probe senses that the condenser temperatu-
re has rised to 70
°
C (160
°
F) for one of the
following abnormal reasons:
CLOGGED CONDENSER
FAN MOTOR OUT OF OPERATION
AMBIENT TEMPERATURE HIGHER THEN
38
°
C (100
°
F)
it causes the total and immediate SHUT-
OFF of the machine in order to prevent the
unit from operating in abnormal and
dangerous conditions. When the ice maker
stops on account of this protective device,
there is a simultaneous glowing of the AØ8,
warning the user of the Hi Temperature
situation. After having eliminated the source
of the excessive condenser temperature, to
restart the ice machine it is necessary to
push the GREEN ON/OFF button.
NOTE. If, after ten minutes from the unit start
up, no ice is made and the evaporating
temperature detected by the evaporator
sensor results to be higher than -0
°
C (30
°
F)
the ice maker stops and the AØ6 glows on
display.
MECHANICAL SYSTEM
The mechanical system of the SCOTSMAN Ice
Dispenser consists basically of a gear motor
assembly which drives, a worn shaft or auger
placed on its vertical axis within the freezing
cylinder.
The gear motor is made of a single phase electric
motor with a permanent capacitor. This motor is
directly fitted in the gear case through which it
drives - in counter clockwise rotation at a speed
of 10 r.p.m. - the freezer auger being linked to it.
NOTE. In the event the gear motor will tend
to rotate slowly or not rotating at all the unit
will stop immediately with the glowing of the
A10 Alarm Code on display on account of
the intervention of the Electromagnetic
Safety Device - based on Hall Effect principle.
After having diagnosed and eliminated the
source of the failure, to restart the unit it is
necessary to press the GREEN ON/OFF
button.
When the gear motor rotating speed is slowed
below 360 r.p.m. from the normal speed of
1300 r.p.m. the Electromagnetic Safety Device
transmits an electrical signal to the
MICROPROCESSOR to stop immediately the
unit operations like it occures for the wrong
rotation, with the lighting-up of the A10 Alarm
Code. This to relieve from the excessive load all
the electrical and mechanical components of
the entire Drive System and extend their
durability.
NOTE. After having diagnosed and eliminated
the source of the gear motor slow rotation to
restart the unit it is necessary to press the
GREEN ON/OFF button.
NOTE. Any time the machine stops in alarm
the RED alarm capacitive key will be ON.
REFRIGERANT METERING DEVICE:
capillary tube
OPERATING PRESSURES
(With 21
°
C ambient temperature)
DXN 107 DXN 207
Discharge pressure: 12,0 bar 11,3 bar
Suction pressure: 2,8 bar 1,5 bar
REFRIGERANT CHARGE (R 452A):
DXN 107 65 gr
DXN 207 65 gr
NOTE. Before charging the refrigerant system
always check the type of refrigerant and
quantity as specified on the individual ice
machine dataplate.
The refrigerant charges indicated are relatives
to averages operating conditions.
ACCUMULATOR
CAPILLARY TUBE
COMPRESSOR
DISCHARGE LINE
CONDENSER
SUCTION LINE
FAN MOTOR
EVAPORATOR