Scotsman NME650R Service Manual page 35

REFRIGERATION SERVICE: R-404A
THIS ICE MACHINE USES R-404A (HP62)
REFRIGERANT AND POLYOLESTER
COMPRESSOR OIL.
DO NOT USE MINERAL OIL IN THIS
REFRIGERATION SYSTEM.
HP62 is a "Near Azeotrope", and therefore
liquid charging is preferred.
When the system is serviced, a special liquid
line dryer is required.
Polyolester oil absorbs water very easily, and
therefore when the system is opened for
service, it must be re-sealed as soon as
possible (15 minutes maximum).
Special leak detection equipment is required to
locate small refrigerant leaks. Usually a leak
detector capable of detecting a Halogenated
refrigerant or HFC-134A will work. Check with
the leak detector manufacturer if in doubt.
As with any other refrigerant, do NOT mix HP62
with pressurized air when leak testing.
Pressure-Temperature Chart for HP62
VAPOR
TEMP. PRESSURE
(DEG F) (PSIG)
-20 . . . . . . 17
-18 . . . . . . 18
-16 . . . . . . 20
-14 . . . . . . 21
-12 . . . . . . 23
-10 . . . . . . 24
-8 . . . . . . 26
-6 . . . . . . 28
-4 . . . . . . 29
-2 . . . . . . 31
0 . . . . . . 33
2 . . . . . . 35
4 . . . . . . 37
6 . . . . . . 39
8 . . . . . . 41
10 . . . . . . 43
12 . . . . . . 46
14 . . . . . . 48
16 . . . . . . 50
18 . . . . . . 53
20 . . . . . . 55
22 . . . . . . 58
24 . . . . . . 60
26 . . . . . . 63
28 . . . . . . 66
30 . . . . . . 69
32 . . . . . . 72
34 . . . . . . 75
36 . . . . . . 78
38 . . . . . . 81
40 . . . . . . 85
42 . . . . . . 88
44 . . . . . . 91
46 . . . . . . 95
48 . . . . . . 99
50 . . . . . . 102
52 . . . . . . 106
54 . . . . . . 110
56 . . . . . . 114
58 . . . . . . 118
60 . . . . . . 123
62 . . . . . . 127
64 . . . . . . 132
66 . . . . . . 136
68 . . . . . . 141
August 1993
Page 35
NME650R
VAPOR
TEMP. PRESSURE
(DEG F) (PSIG)
70 . . . . . . 146
72 . . . . . . 150
74 . . . . . . 155
76 . . . . . . 161
78 . . . . . . 166
80 . . . . . . 171
82 . . . . . . 177
84 . . . . . . 182
86 . . . . . . 188
88 . . . . . . 194
90 . . . . . . 200
92 . . . . . . 206
94 . . . . . . 212
96 . . . . . . 219
98 . . . . . . 225
100 . . . . . 232
102 . . . . . 239
104 . . . . . 246
106 . . . . . 253
108 . . . . . 260
110 . . . . . 268
112 . . . . . 275
114 . . . . . 283
116 . . . . . 291
118 . . . . . 299
120 . . . . . 307
122 . . . . . 316
124 . . . . . 324
126 . . . . . 333
128 . . . . . 342
130 . . . . . 351
132 . . . . . 360
134 . . . . . 370
136 . . . . . 379
138 . . . . . 389
140 . . . . . 399
142 . . . . . 409
144 . . . . . 420
146 . . . . . 430
148 . . . . . 441
150 . . . . . 452
152 . . . . . 464
154 . . . . . 475
156 . . . . . 487
158 . . . . . 499