Refrigeration Systems; Refrigeration System Adjustments; Expansion Valve; Adjustment And Troubleshooting - Cornelius WM600 Service Manual

REFRIGERATION SYSTEMS

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EFRIGERATION 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.
E V
XPANSION ALVE
You will find a thermal expansion valve on Cornelius 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.
A
DJUSTMENT AND
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 properly.
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 evapo-
rator) 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 possible problems. If
proper refrigerant charge is questionable, evacuate the refrigeration system and recharge to nameplate speci-
fications. 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.
© 2004-2014, Cornelius Inc.
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ROUBLESHOOTING
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Ice Maker Service Manual
Publication Number: 630460082SER