Scotsman MV 12, Service Manual

Page: 21 / 30

Page 21
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
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.
Disch. Disch. Suction Suction Amp. Amp.
pressure pressure pressure pressure compr. compr.
freeze freeze Beginning End Beginning End
max min freeze freeze freeze freeze
MV 12 A 16 bar 14 bar 28 bar 3.1 bar 1.9 bar 20'
MV 12 W 17 bar 17 bar 28 bar 3.3 bar 2.2 bar 20'
MV 21 A 15.5 bar 13.5 bar 28 bar 3.5 bar 1.7 bar 20' 5.0 A 4.0 A
MV 21 W 17 bar 17 bar 28 bar 3.0 bar 1.7 bar 20' 5.0 A 4.0 A
MV 32 A 16.5 bar 14.5 bar 28 bar 3.5 bar 1.7 bar 20' 8.0 A 5.5 A
MV 32 W 17 bar 17 bar 28 bar 2.8 bar 1.5 bar 22' 7.0 A 5.5 A
MV 50 A 17.5 bar 15.5 bar 28 bar 3.5 bar 1.6 bar 22' 6.5 A 5.5 A
MV 50 W 17 bar 17 bar 28 bar 28 bar 1.4 bar 22' 6.0 A 5.0 A
Freezing
time
Hi press.
Cut Out
Safety
Model
Refrigerant charge R 404 A
Model
MV 12 MV 21 MV 32 MV 50
Air cooled 700 gr. 1200 gr. 1700 gr. 2000 gr.
Water cooled 650 gr. 650 gr. 700 gr. 1200 gr.
Refrigerant metering device
Thermostatic expansion valve (2 on MV 50).
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.