Scotsman EC 106 - Principles of Operation; Freezing Cycle

Page 22
Page 22
NOTE. The Ice Level Control stops the
operation of the machine at BIN FULL ONLY at
the end of the defrost/harvest cycle.
Take the hand out from the ice level control
sensors to allow the resumption of the light beam.
After approximately 6 seconds the ice maker
resume its operation with the immediate glowing
of the FIRST YELLOW LED indicating UNIT IN
OPERATION and the extinguishing of the “BIN
FULL” YELLOW LED.
NOTE. The ICE LEVEL CONTROL
(INFRARED SYSTEM) is independent of the
temperature however, the reliability of its
detection can be affected by external light
radiations or by any sort of 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 locate the unit where it is not
reached by any direct light beam or light
radiation, also it is recommended to keep the
bin door constantly closed and to follow the
instructions for the periodical cleaning of
the light sensor elements as detailed in the
MAINTENANCE AND CLEANING PRO-
CEDURES.
At time of installation it's necessary to perform
the calibration of the I/R Ice Level control.
• Switch OFF the machine at Master Green
Push Button Switch
• Push and hold the PC Board Push Button
• Switch ON the machine at Master Green
Push Button Switch
• Few seconds later the LEDs of the PC
Board are ON
• Release the PC Board Push Button
The I/R Ice Level control is now calibrated.
FIG. 5
16
15
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
COMPRESSOR
FAN MOTOR
WATER PUMP
- EVAPORATOR
- CONDENSER
TEMPERATURE SENSORSBIN
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
If the ice cubes are shallow and cloudy, it is
possible that the ice maker runs short of water
during the freezing cycle second phase or, the
quality of the supplied water requires the use of
an appropriate water filter or conditioner.
J. As soon as the water into the Sealed Water
Reservoir reaches the maximum level, the two
metal pins close the electrical contact through
the water, transmitting a low voltage current to
the PC Board.
The PC Board activates the Water Drain
Pump for 8 seconds pumping out most of the
water contained into the Sealed Water Reservoir.
K. To be sure of the correct operation of ice
level control device, place one hand between its
sensing “eyes” to interrupt the light beam during
the defrost cycle only.
The Bin Full YELLOW LED starts to blink (Fig. 6) ,
and when the defrost cycle is over, the unit stops
with the simultaneous glowing of the same LED
to monitor the BIN FULL situation (Fig.6a).