Scotsman SCE170 - Manual (Page 29)

Refrigeration System Service: HP62 (R-404A)
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
Pressure-Temperature Chart for HP62
This ice machine uses R-404A refrigerant and
polyolester oil. Do NOT use mineral oil in this
refrigeration system.
•
R-404A is a "Near Azeotrope" so liquid
charging is required:
¤ Weigh in as liquid as much of the charge as
possible into the discharge line.
¤
Install a sight glass between the manifold and
the suction side hose and carefully meter
liquid into the suction side, using the manifold
valve to "flash off" the liquid before it enters
the ice machine. Do this until the proper
amount of refrigerant has been weighed into
the system.
•
When the system is serviced, a special liquid
line drier is required. It is included with
replacement compressors.
•
HP62 is not compatable with mineral oil, so
these ice machines use Polyolester oil.
Polyolester oil absorbs water very easily. When
one of these refrigeration systems 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 dectecting a Halongenated
refrigerant or HFC-134A will work. Check with
the leak detector manufacturer if in doubt.
SCE170
October 1998
Page 29