27
SERVICE SPECIFICATION
In servicing a machine, it is often useful to
compare that individual unit 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 ℃ ambient and 15 ℃ water. Use these
numbers as a guideline only.
COMPONENT
Reservoir Level
NW307/308 65~69mm
NW507/508 85~90mm
NW 457/458/NW608 80~85 mm
NW 1008 100~105 mm
NW1408 100~105 mm
Cube Size Control Ice Sensor –
distance from evaporator 3~5 mm
High Pressure Safety Switch.
NW307-308-507-508-457-458-608-1008-
1408:
Cut in 23 bar
Cut out 33 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 its
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.
Refrigerant metering device
Thermostatic expansion valve.
Refrigerant charge R 404A
MODEL NW308
NW508
NW 458
NW 608
380V
220V
220V
460 730 700 850 1600 1350 2200
60 Hz 460 500 700 850 ----- 1300 2200
Water cooled 50 Hz 330 500 500 550 1300 1200 1800
Water cooled 60 Hz 300 500 500 550 ----- 1200 1800
Refrigerant charge R452A
MODEL NW308
NW508
NW 458
NW 608
380V
220V
220V
550 800 700 950 1600 1350 2200
60 Hz ------ ------- ------ ------ ----- ---- --------
Water cooled 50 Hz 350 500 500 550 1350 1200 1800
Water cooled 60 Hz ------- ------- ----- ------- ----- ------ -------
Refrigerant charge R290
MODEL NW307
NW507
NW 457
149 149 149
NOTE: Always check nameplate on individual ice machine for special refrigerant charge before
charging the refrigeration system. Such refrigerant charge is the average charge for the NW Modular
Cubers. However it is important to check nameplate of each machine.
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