Refrigeration Service: Hp62 - Scotsman FME800 Service Manual

NME650 & FME800
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.
R-404A 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.
Evacuate to 300 microns
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.
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
February 1997
Page 30
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