Scotsman MDT5N25 User Manual
Page 31
REFRIGERATION SERVICE: R-404A (HP62)
THIS ICE MACHINE USES 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.
Weigh into the discharge side as much as
possible of the charge as liquid refrigerant.
Install a sight glass between the manifold
and the suction side hose. Carefully meter
liquid refrigerant into the suction side, using
the manifold valve to “flash off” the liquid
before it enters the ice machine. Do this until
the proper charge has been weighed into the
system.
·
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.
MDT5N25 & MDT5N40
May 2001
Page 30
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