Mechanical System - Scotsman MDT2C12 User Manual

MDT2

MECHANICAL SYSTEM

The mechanical system of the SCOTSMAN
Nugget Ice Dispenser consists of a gear motor
assembly that drives (through a ratchet coupling) 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 a counter clockwise rotation at a speed
of 9.5 rpm – the freezer auger linked to it by the
ratchet coupling.
NOTE If the gear motor rotates in the wrong
direction (counter-clockwise) or is not rotating at all
the unit will stop immediately and the 3RD
WARNING YELLOW LED will turn on showing the
intervention of the Electromagnetic Safety Device -
based on Hall Effect principle.
After diagnosing and eliminating the source of the
failure, restart the unit by pressing the RESET
button or turn the power switch OFF and ON (Fig.
7).
The RED LED will start blinking and after 3
minutes the ice machine will resume normal
operations by running first the gear motor and then
the compressor.
When the gear motor rotating speed is slowed
below 1300 rpm - normal speed is 1400 rpm - the
Electromagnetic Safety Device transmits an
electrical signal to the MICROPROCESSOR to
stop the unit operation immediately (just as it does
Fig 7
Hi cond temp when Steady
3 minute wait when Blinking
Bin empty
Auger Motor when Steady
Hi evap temp when Blinking
for the wrong rotation) and the 3rd YELLOW
WARNING LED turns on. This is done to avoid
overloading the electrical and mechanical
components of the entire Drive System and extend
their durability.
NOTE: After diagnosing and eliminating the source
of the gear motor slow rotation, restart the unit by
pushing the RESET button to or turning the power
line main switch OFF and ON.
NOTE: Any time the machine stops with a problem
the front 4 LED's start to blink.
REFRIGERANT METERING DEVICE:
·
Capillary tube
OPERATING PRESSURES
(With 70°F ambient temperature)
·
Discharge pressure: 130 to 145 psig
·
Suction pressure: 14.5 psig
·
REFRIGERANT CHARGE (R 134 A): 13 oz.
NOTE: Before charging the refrigerant system
always check the type of refrigerant and quantity
as specified on the individual ice machine data
plate.
The refrigerant charges indicated are relatives to
averages operating conditions.
Reset button
Bin full
No water
Power
May 2003
Page 14