Refrigeration System; Note: Thermostatic Expansion Valve No Adjustment; Lbs. Discharge Pressure; Water Temperature - Cornelius 500-Series Installation And Service Manual

Continuous flow icemaker

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Table Of Contents

Table of Contents

WCC 500

40_

65_

162

166

50_

188

' 92

60_

214

218

70_

245

249

80_

275

279

90_

309

313

100_

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_ to 90_F, depending on the season of the year.

Whenever a new icemaker product is initially installed and started-up, it is imperative that the start-up operation

make the following checks and/or readjustments for local conditions.

EXPANSION VALVE

You will find a thermostatic expansion valve on icemakers, 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 system troubleshooting 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 first be sure you have adequate water flowing into evapo-

rator, a clean condenser, unit is properly ventilated, and system is properly charged and free from any restric-

tions. Also be sure compressor is operating properly.

Second, take reservoir water temperature and air temperature from condenser inlet and determine at what pres-

sure unit should be running. Machines are equipped with thermostatic valves, there is NO adjustment. If correct

pressure cannot be obtained, first be sure system has time to stabilize 10-15 minutes. Second, be sure sensing

bulb is located at 12:00 position on 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 system for possible problems. If proper charge is question-

able evacuate and recharge to nameplate and leak check. If valve still malfunctions replace valve.

When replacing valve be sure to bleed refrigerant gas from low side port so as not to lose refrigerant oil. Use

general refrigerant system practices when replacing and recharging unit. After new valve is in place, go through

previous monitored adjustments and troubleshooting to be sure valve is functioning properly.

NOTE: Units with thermostatic expansion valve— valve is located on bottom refrigerant line. Sensing

bulb is located on top refrigerant line. On water cooled units adjust condenser modulating valve be-

fore troubleshooting expansion valve.

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