Scotsman CME650R - Manual (Page 29)

REFRIGERATION SERVICE: R-404A
THIS ICE MACHINE USES 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 required.
¤ Weigh as much of the charge as liquid into
the receiver as possible.
¤ Install a sight glass between the suction
service valve and the gage manifold. Use the
manifold valve to "flash off" liquid before it
enters the ice machine’s refrigeration system.
••
When the system is serviced, a special liquid
line dryer is required (see parts list).
••
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 VAPOR
TEMP. PRESSURE TEMP. PRESSURE
(DEG F) (PSIG) (DEG F) (PSIG)
-20 . . . . . . 17 70 . . . . . . . 146
-18 . . . . . . 18 72 . . . . . . . 150
-16 . . . . . . 20 74 . . . . . . . 155
-14 . . . . . . 21 76 . . . . . . . 161
-12 . . . . . . 23 78 . . . . . . . 166
-10 . . . . . . 24 80 . . . . . . . 171
-8 . . . . . . . 26 82 . . . . . . . 177
-6 . . . . . . . 28 84 . . . . . . . 182
-4 . . . . . . . 29 86 . . . . . . . 188
-2 . . . . . . . 31 88 . . . . . . . 194
0 . . . . . . . 33 90 . . . . . . . 200
2 . . . . . . . 35 92 . . . . . . . 206
4 . . . . . . . 37 94 . . . . . . . 212
6 . . . . . . . 39 96 . . . . . . . 219
8 . . . . . . . 41 98 . . . . . . . 225
10 . . . . . . . 43 100 . . . . . . 232
12 . . . . . . . 46 102 . . . . . . 239
14 . . . . . . . 48 104 . . . . . . 246
16 . . . . . . . 50 106 . . . . . . 253
18 . . . . . . . 53 108 . . . . . . 260
20 . . . . . . . 55 110 . . . . . . 268
22 . . . . . . . 58 112 . . . . . . 275
24 . . . . . . . 60 114 . . . . . . 283
26 . . . . . . . 63 116 . . . . . . 291
28 . . . . . . . 66 118 . . . . . . 299
30 . . . . . . . 69 120 . . . . . . 307
32 . . . . . . . 72 122 . . . . . . 316
34 . . . . . . . 75 124 . . . . . . 324
36 . . . . . . . 78 126 . . . . . . 333
38 . . . . . . . 81 128 . . . . . . 342
40 . . . . . . . 85 130 . . . . . . 351
42 . . . . . . . 88 132 . . . . . . 360
44 . . . . . . . 91 134 . . . . . . 370
46 . . . . . . . 95 136 . . . . . . 379
48 . . . . . . . 99 138 . . . . . . 389
50 . . . . . . . 102 140 . . . . . . 399
52 . . . . . . . 106 142 . . . . . . 409
54 . . . . . . . 110 144 . . . . . . 420
56 . . . . . . . 114 146 . . . . . . 430
58 . . . . . . . 118 148 . . . . . . 441
60 . . . . . . . 123 150 . . . . . . 452
62 . . . . . . . 127 152 . . . . . . 464
64 . . . . . . . 132 154 . . . . . . 475
66 . . . . . . . 136 156 . . . . . . 487
68 . . . . . . . 141 158 . . . . . . 499
CME650R
October 1994
Page 29