Page 25
Page 25
Freeze Cycle (21°C amb/15°C water)
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 related
to average operating conditions.
WARNING. As R 404 a is a band of different
types of refrigerants it is imperative to charge
the system only in liquid phase in order to
avoid to alter their mix-up percentage.
COMPONENTS DESCRIPTION
A. EVAPORATOR TEMPERATURE SENSOR
The evaporator temperature sensor probe,
located in contact with the evaporator serpentine,
detects the dropping of the evaporator tempera-
ture during the freezing cycle and signals it by
supplying a current flow to the micro processor of
P.C. BOARD.
According to the current received, the evaporator
sensor supplies power to the P.C. BOARD first,
when it reachs 0
°
C (32
°
F), second at -15
°
C (5
°
F);
in this second case it supply power to the electronic
timer built into the P.C. BOARD so that it may
take control of the fength of the 2nd phase of
freezing cycle. The length of the timed phase is
pre-f ixed by the setting of the keys 1, 2, 3 and 4
of the DIP SWITCH.
The activation of the electronic timer (-15°C -
5°F) is monitored by the lighting up of the RED
LED placed in the front of the P.C. BOARD. This
lighting up occures usually in the mid period of
the freezing cycle and signals the switching from
the first to the second phase of the freezing cycle.
NOTE. Whenever, after 15 minutes from the
beginning of the freezing cycle, the
evaporating temperature have not yet
reached the value of 0
°
C (32
°
F), the P.C.
BOARD switches OFF the machine with the
BLINKING of RED LED.
MODEL VOLTAGE CUBE SIZE
discharge
S 710 3,6 / 1,85 15 - 16,5
MXG 328 A 230/50/1 M 610 3,1 / 1,6 14,5 - 16,5
L 610 3 / 1,5 15 - 16,5
S
MXG 328 W 230/50/1 M 480 3,7 / 1,9 17
L
S 690 2,6 / 1,2 16,5 - 21
MXG 428-438 A 230/50/1 M 630 2,6 / 1,1 14,5 - 16,5
L 580 2 / 0,9 15 - 17
S
MXG 428-438 W 230/50/1 M 520 2,5 / 1,2 16,5 - 18,5
L
S 950 2,8 / 1,5 14 - 15,5
MXG 638 A 230/50/1 M 770 2,7 / 1,1 13,5 - 16,5
L 800 2,2 / 1 13 - 15
S
MXG 638 A 400/50/3 M 870 2,6 / 1,1 13 - 15
L 940 2,9 / 1,2 13 - 17
S
MXG 638 W 230/50/1 M 650 2,8 / 1,5 17
L
S
MXG 938 A 400/50/3 M 2300 1,5 / 0,7 13,5 - 16,5
L 2000 2 / 0,5 17
S
MXG 938 W 400/50/3 M 1700 1,5 / 0,7 17
L 1700 2,6 / 0,9 17
OPERATING PRESSURE (bar)
at 21°C amb. / 15°C water
suction
(beg./end freez.)
REF. CHARGE
(R404a - gr.)
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