VAPOR VAPOR
TEMP. PRES. TEMP. PRESS.
(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: See the
next page.
••When the system is serviced, a special liquid line drier is required. It is
included with replacement compressors.
••HP62 is not compatible 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 detecting a Halongenated
refrigerant or HFC-134A will work. Check with the leak detector
manufacturer if in doubt.
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.
General Information:
Work on the refrigeration system should only be done when it is certain
that the system needs repair.
••Refrain from checking refrigeration pressures without reason.
Visual inspection of the water system, observation of the ice
formation, amp draw, voltage, and other techniques will lead to proper
diagnosis.
••If gauges must be used, don’t always check the high side pressure. If
the condenser is clean and seems to be operating correctly, it most
likely is.
••If gauges must be used, use very short hoses to minimize refrigerant
discharged into the air.
••Refrigerant should not be added except as a way to determine the
proper operation of the product. If the system was low on refrigerant,
there is a leak, and it must be found and repaired.
••This system has a critical charge, it must be recharged with the
correct amount of refrigerant as listed on the nameplate of the ice
machine, or performance will suffer.
••Anytime the refrigeration system has been opened, the dryer should
be replaced. Note: Only a HFC type dryer can be used.
••When brazing the tubing connections to components such as the
TXV, the component must be protected by heat sink material.
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.
REFRIGERATION SERVICE
CME865R & CME1002R
September, 1994
Page 31
(32 paginas)
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