Service Specifications; Component; Operating Characteristics - Scotsman NW507 Service Manual

SERVICE SPECIFICATION
In servicing a machine, it is often useful to
compare that individual
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
NW507/508
NW 457/458/NW608
NW 1008
NW1408
Cube Size Control Ice Sensor –
distance from evaporator 3~5 mm
Refrigerant charge R 404A
MODEL
Air cooled 50 Hz
Air cooled 60 Hz
Water cooled 50 Hz
Water cooled 60 Hz
Refrigerant charge R452A
MODEL
Air cooled 50 Hz
Air cooled 60 Hz
Water cooled 50 Hz
Water cooled 60 Hz
Refrigerant charge R290
MODEL
Air cooled 50 Hz
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.
unit operating
65~69mm
85~90mm
80~85 mm
100~105 mm
100~105 mm
NW308 NW508 NW 458 NW 608
460 730
460 500
330 500
300 500
NW308 NW508 NW 458 NW 608
550 800
------ -------
350 500
------- -------
NW307 NW507 NW 457
149 149
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.
NW1008
700 850
700 850
500 550
500 550
NW1008
700 950
------ ------
500 550
----- -------
149
27
NW1008
380V 220V
1600 1350
----- 1300
1300 1200
----- 1200
NW1008
380V 220V
1600 1350
----- ----
1350 1200
----- ------
NW1408
220V
2200
2200
1800
1800
NW1408
220V
2200
--------
1800
-------