User manual CORNELIUS & CIE IAC330 SERVICE MANUAL AND MAINTENANCE GUIDE

[. . . ] THE HOTTEST MACHINES ON ICET I" Series Ice Cube Machine SERVICE MANUAL & MAINTENANCE GUIDE (Includes Installation Instructions) 166240004 12/1/94 Revised: 3/4/96 TABLE OF CONTENTS Page MODEL AND SERIAL LOCATION . i 1 1 1 11 11 12 12 12 12 13 14 14 14 15 16 16 16 16 17 17 19 19 19 20 22 23 23 24 24 24 24 24 24 24 24 25 25 25 25 25 25 26 166240004 3 ­ 10 TABLE OF CONTENTS (cont'd) Page FLOODING TXV - PRODUCT SYMPTOMS . CUBER NOT OPERATING, INDICATOR LIGHTS "OFF", NO POWER TO CIRCUIT BOARD . CUBER NOT OPERATING, INDICATOR LIGHTS "OFF", POWER TO THE CIRCUIT BOARD . [. . . ] Should adjustment be required, the valve has an adjustment stem on the top of the valve. After allowing the cuber to operate for 10 minutes in the ice­ making mode to balance the system, turning the adjusting stem CW will increase the discharge water temperature, and CCW will decrease the discharge water temperature. The water regulating valve must close off condenser water flow completely during the "hot gas" harvest cycle. There should be no discharge water flowing out of the condenser during the harvest cycle. Should the valve fail to close during the harvest mode, the condenser will continue to condense the compressor discharge vapor needed for the harvest cycle and this will result in long harvest times. Also discharge water temperature below 108_F /112_F will result in long harvest times. Leaking (bypassing) water regulating valves are normally the result of scale build-up on the valve diaphragm and the valve should be flushed, not replaced. To flush the valve, open the adjusting stem wide open CCW (or force the valve spring up with a screwdriver), open and close the water supply to the condenser resulting in the flushing action. Damage to the water regulating valve may also be caused by water hammer. Water hammer will result from the condenser inlet and outlet water lines being reversed or defective valve stops in the water supply line. Proper installation of water­cooled equipment should always include an anti-water hammer standpipe in the supply inlet line as close to the cuber as possible. 12/1/94 166240004 26 Rev 3/4/96 SERVICE STEM VALVES When closing the service stem valves to remove your gauge and manifold set always close the high side stem valve first. Following this procedure will allow the system to "PULL" the refrigerant vapor from your manifold set to reduce refrigerant loss. When the pressure has been reduced, close the low side stem valve. MOISTURE CONTAMINATION With the major changes in refrigerants in today's marketplace and the use of hydroscopic oils the control of moisture and contaminates have become more critical to safeguard against than ever before in the history of mechanical refrigeration. Contaminates are also the most difficult of all problems to determine. A Meg-Ohm meter "Megger" can be a valuable tool to aid in the analysis of this problem. A Meg-Ohm reading log may be started any time after 90 days of operation of the product. Disconnect all three (3) compressor leads, take a Meg-Ohm meter reading from each compressor terminal to a good chassis ground. Compare reading to chart below: Meter Reading Meg Ohm 100 Compressor Condition Okay Moisture present Severe moisture & possible contaminated oil with acid present System has severe contamination Maintenance Required None needed. Discharge system, dis card suction line drier, replace the liquid line drier. Evacuate and recharge. 50 to 100 20 to 50 . 5 to 20 Readings in the range listed below 100 Meg-Ohm would be an indicator that the system being tested may have a contamination problem. As an example, the filter drier may become saturated and hold large percentages of moisture and the system function without a problem until such time as the product operating conditions change. [. . . ] The normal flow pattern through the headmaster is from the condenser port to the receiver port. When this flow pattern is unable to maintain a receiver outlet pressure equal to or above the dome pressure setting of the valve, the dome pressure will force the valve portage to change closing the condenser port and opening the bypass port from the compressor discharge line. This allows the high pressure vapor from the discharge port to "buck" the receiver pressure back up. With the condenser port closed, the refrigerant is backed up in the condenser, basically reducing the condenser size, assisting in maintaining the discharge portage flow and increasing the head pressure. [. . . ]