Cornelius 2000 - Series Manual de instalación descargar pdf (Pagina 17)

638085277

The operating positions of the switch are fixed, no adjustments are necessary. If switch replacement becomes

necessary, simply disconnect cable at connector, remove wires from switch.

TEMPERATURE / PRESSURE CHARTS*

Air Temperature

$10 lbs. Discharge Pressure

Water Temperature

50_

60_

70_

80_

90_

100_

40_ 65_ 90_ 40_ 65_ 90_

162

188

214

245

275

309

166

192

218

249

279

313

168

194

220

251

281

315

174

202

230

265

300

328

177

205

233

269

304

334

180

208

236

272

307

340

40_ 65_

114

124

161

187

120

167

193

102

124

147

171

195

90_

IMD300–5 & IMD300–15 IMD300–30

IMD600–30, IMD600–90

NOTE: The thermostatic expansion valve is non–adjustable on all models.

REFRIGERATION SYSTEM ADJUSTMENTS

A complete understanding of the icemaker and hermetic refrigeration system is necessary before any adjust-

ments are made. The refrigeration technician must use high and low side pressure readings, water and air tem-

peratures, plus general conditions of cleanliness to assess the refrigeration system status when making any

adjustments.

All icemaker products are tested and adjusted at the factory prior to shipment where the ambient temperature

ranges from 65_F to 90_F, depending on the season of the year.

Whenever a new icemaker is initially installed and started–up, it is imperative that the start–up operator make

the following checks and readjustments for local conditions.

EXPANSION VALVE

You will find a thermal expansion valve on ice makers, which is used to control the amount of refrigerant flowing

through the evaporator. Improperly installed or defective expansion valves may cause low production, soft ice,

squeaking from evaporator and excessive load inside evaporator.

By using general refrigeration trouble shooting along with the pressure charts, you can easily determine whether

or not the expansion valve is working properly.

ADJUSTMENT AND TROUBLESHOOTING

When troubleshooting the expansion valve, you must;

1. Be sure you have adequate water flowing into the evaporator, a clean and properly ventilated condenser,

and the system is properly charged and free of any restrictions. Also be sure compressor is operating prop-

erly.

2. Take reservoir water temperature and air temperature from condenser inlet and determine at what pressure

unit should be running. On machines equipped with thermostatic valve there is NO adjustment. If correct

pressure cannot be obtained, be sure system has time to stabilize, 10–15 minutes.

3. Be sure sensing bulb is located at outlet side of evaporator about 3–4 inches away from evaporator and be

sure to insulate well and clamp tightly to tubing. If system pressures are still not adequate, take a second

water and air temperature reading and go over other parts of the system for possible problems. If proper

charge is questionable evacuate and recharge to nameplate and leak check. If valve still malfunctions re-

place valve.

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