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Page 21
SERVICE SPECIFICATION
In servicing a machine, it is often, useful to
compare that individual units operating
characteristics to those of a normally operating
machine. The data that follows gives those
characteristics; however, be aware that these
values are for NEW, CLEAN machine operating
at 21 °C ambient and 15 °C water. USE THESE
NUMBERS AS A GUIDELINE ONLY.
COMPONENT
Reservoir level .............................. 30÷35 mm
Cube Size Control Ice Sensor - distance from
evaporator ......................................... 5 ÷ 7 mm
High Pressure Safety Switch.
C/IN 20 bar - C/OUT 28 bar
Disch.
pressure
Model
freeze
max
MV 12 A
16 bar
MV 12 W
17 bar
MV 21 A
15.5 bar
MV 21 W
17 bar
MV 32 A
16.5 bar
MV 32 W
17 bar
MV 50 A
17.5 bar
MV 50 W
17 bar
Refrigerant charge R 404 A
Model
MV 12
MV 21
Air cooled
700 gr.
1200 gr. 1700 gr.
Water cooled
650 gr.
Refrigerant metering device
Thermostatic expansion valve (2 on MV 50).
Disch.
Hi press.
pressure
Cut Out
freeze
Safety
min
14 bar
28 bar
17 bar
28 bar
13.5 bar
28 bar
17 bar
28 bar
14.5 bar
28 bar
17 bar
28 bar
15.5 bar
28 bar
17 bar
28 bar
MV 32
MV 50
2000 gr.
650 gr.
700 gr.
1200 gr.
OPERATING CHARACTERISTICS
On air-cooled models during the freezing cycle,
the discharge pressure is maintained between
two preset values by means of fan control
(condenser sensor); and at the same time, the
suction pressure will also decline reaching it's
lowest point just before harvest. Compressor
amps experience a similar drop.
On water-cooled, the discharge pressure is
constantly, maintained during the freeze cycle by
the water regulating valve. However, suction
pressure and compressor amps, will still decline
as the machine freezes ice.
Suction
Suction
pressure
pressure
Freezing
Beginning
End
freeze
freeze
3.1 bar
1.9 bar
3.3 bar
2.2 bar
3.5 bar
1.7 bar
3.0 bar
1.7 bar
3.5 bar
1.7 bar
2.8 bar
1.5 bar
3.5 bar
1.6 bar
28 bar
1.4 bar
NOTE: Always check nameplate on individual
icemachine for special refrigerant charge
before charging the refrigeration system. Such
refrigerant charge is the average charge for
the MV Modular Cubers. However it is
important to check nameplate for each
machine.
Page 21
Amp.
Amp.
compr.
compr.
time
Beginning
End
freeze
freeze
20'
20'
20'
5.0 A
4.0 A
20'
5.0 A
4.0 A
20'
8.0 A
5.5 A
22'
7.0 A
5.5 A
22'
6.5 A
5.5 A
22'
6.0 A
5.0 A
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