REFRIGERATION SERVICE: R-404a (HP62)
THIS ICE MACHINE USES 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.
Weigh into the discharge side as much as possible
of the charge as liquid refrigerant.
Install a sight glass between the manifold and ths
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.
••
The vacuum pump or recovery unit should use
polyolester oil.
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
Pressure-Temperature Chart for HP62
NDE750
December 1993
Page 29
