Service manual
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.
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
TDE550 & TDE650
August 1999
Page 30