Refrigeration Systems; Refrigeration System Adjustments; Expansion Valve; Adjustment And Troubleshooting - Cornelius WM600 Installation & Owner's Manual

Ice maker

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Service manual (28 pages)

Table Of Contents

Table of Contents

REFRIGERATION SYSTEM ADJUSTMENTS

A complete understanding of the Ice Maker and the hermetic refrigeration system is necessary before any

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

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

adjustments.

All Ice Maker 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 Ice Maker is initially installed and started, 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 IMI 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 the evaporator.

By using the 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 the condenser inlet and determine at what

pressure the Ice Maker should be operating. On Ice Makers equipped with a thermostatic valve, there is

NO adjustment. If the correct pressure cannot be obtained, be sure the system has time to stabilize (10–15

minutes).

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

evaporator) and be sure to insulate well and clamp tightly to tubing. If the system pressures are still not

adequate, take second water and air temperature reading and go over other parts of the system for pos-

sible problems. If proper refrigerant charge is questionable, evacuate the refrigeration system and recharge

to nameplate specifications. Leak check the refrigeration system. If the expansion valve still malfunctions

replace the valve.

Use general refrigeration system practices when replacing and recharging the unit. After new valve is in place,

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

NOTE: On water-cooled Units, adjust the condenser modulating valve before troubleshooting the

expansion valve.

CAUTION: Very high discharge pressure is present in the refrigeration system. Quick

disconnects on your gages will minimize Danger and loss of refrigerant. Comply with

federal regulations for reclaiming refrigerant.