Scotsman NDE650 Manual de servicio descargar pdf (Pagina 32)

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. Evacuate to 300 microns.

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

033 90 200

235 92 206

437 94 212

639 96 219

841 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

NDE550 & NDE650

April 1997

Page 32

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