Ice-O-Matic ICEF 155 Service Manual page 14

Page 14
the MICRO-PROCESSOR of the P.C. Board
which energizes, through a TRIAC, the Fan
Motor in ON-OFF mode.
When the opposite situation occures, i.e. the
condenser temperature gets below the pre-fixed
ACCUMULATOR
CAPILLARY TUBE
COMPRESSOR
FAN MOTOR
limit, the temperature sensor changes again its
electrical resistance reducing therefore the
current flow to the P.C. Board to cause a
temporary stop of the Fan Motor.
On the water cooled versions, the refrigerant
head pressure is kept at the constant value of
9.5 bars (138 psig) by the metered amount of
water passing through the condenser which is
regulated by the action of the Water Regulating
Valve that has its capillary tube connected to the
liquid refrigerant line. As pressure increases, the
water regulating valve opens to increase the flow
of cooling water to the condenser.
FIG. 6
WATER
LEVEL
GEAR MOTOR
CONDENSER TEMP.
EVAPORATOR TEMP.
ICE LEVEL CONTROL
L
L
N
N
EVAPORATOR
DISCHARGE LINE
RESET
13
13
ROTATION
12 12
T<1°C
11 11
10
10
9
9
1
1
TRANSF.
2
2
NOTE. In case the condenser temperature probe
s enses that the condenser temperature has
° °
rised to 70 C (160 F) - on air cooled versions
° °
- or 60 C (140 F) - on water cooled versions -
for one of the following abnormal reasons:
CLOGGED CONDENSER (Air cooled version)
INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
FAN MOTOR OUT OF OPERATION (Air
cooled version)
AMBIENT TEMPERATURE HIGHER THEN
° °
43 C (110 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 RED LED,
warning the user of the Hi Temperature
situation. The machine will remain in OFF
mode for one hour then it will restart
automatically. In case the unit trips OFF again
in alarm for 3 times in 3 hours, the machine
SHUTS OFF DEFINITIVELY. After having
eliminated the source of the excessive con-
denser temperature, to restart the ice machine
it is necessary to unplug and plug in again.
The RED LED starts blinking and three
minutes later the flaker unit resume its normal
operating mode. The condenser temperatu-
re sensor has a further safety function which
consist in preventing the unit from operating
in Lo-ambient conditions i.e. when the
condenser body temperature - equivalent to
the ambient temperature - is lower then 1
°
34 F (Fig.6). As soon as the ambient tempe-
rature rises up to 5 ° C (40 ° F) the PC Board
will automatically restarts the machine
through the three minutes delay time.
8
8
7
7
RELAYS
6
6
5
5
4
4
3
3
TRIAC
Page 14
°
C
CONTACTOR COIL
GEAR MOTOR
FAN MOTOR
ELECTRONIC
CARD