Page 16
Page 16
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 5
NOTE.
The length of the entire freezing cycle
is governed by the evaporator temperature
sensor which has its brobe placed in contact
with the evaporator serpentine (Non
adjustable) in combination with the electronic
timer (Adjustable) incorporated in the P.C.
BOARD).
The timer adjustment is factory set in
consideration of the ice maker model, cooling
version and ice cube size (Small, Medium,
Large).
It is possible, however, to modify the timed
length of the freezing cycle, by changing the
DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION
are shown the various time extensions of the
freezing cycle second phase, in relation with
the different DIP SWITCH keys settings.
I. After about 17-20 minutes from the
beginning of the freezing cycle, in an hypothetic
ambient temperature of 21°C , the defrost cycle
takes place with the hot gas and the water inlet
valves being simoultaneously activated (Fig.5).
The electrical components in operation are:
COMPRESSOR
WATER PUMP
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/S
for the first 15 ÷ 20 seconds.
NOTE.
The length of the defrost cycle is
determinated by the DIP SWITCH keys setting
in conjunction with the ambient temperature
sensor located just in front of the condenser.
The length of defrost cycle can be adjusted
by changing the combination setting of keys
5, 6 and 7 of DIP SWITCH as illustrated on
Table C of PRINCIPLE OF OPERATION.
As shown, per each individual keys
combination, it is possible to have a different
length of the defrost cycle in relation to the
different ambient temperature situations;
shorter when the ambient temperature is
high and longer in colder ambients to partially
compensate the length of the freezing cycle,
which is longer in high ambient temperatures
and shorter in low ones.
J. Check, during the defrost cycle, that the
incoming water flows correctly into sump reservoir
in order to refill it and that the surplus overflows
through the overflow drain tube.
K. Check the texture of ice cubes just released.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
If not, wait for the completion of the second cycle
before performing any adjustment.
If required, the length of the timed freezing cycle
can be modified by changing the DIP SWITCH
keys setting as illustrated in OPERATING
PRINCIPLE.
(41 Seiten)
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