Scotsman NSE650 - Manual (Page 29)

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 required.
••
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.
Recover, reclaim or recycle refrigerant. The
method chosen is up to the service company. Any
refrigerant placed into a Scotsman ice machine
must meet ARI spec 700-88. Reclaim programs
are available through most refrigerant wholesalers.
Access Valves: To use the access valves:
Remove the cap from the stem, use a 3/16" allen
wrench to check that the valve is CLOSED. The
remove the core cap.
Close the valve and replace the caps when the
job is finished. The valve must be closed and
the caps must be on or the valve will leak.
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
NSE650
August 1993
Page 29