User manual CORNELIUS & CIE CR800 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 . CLEANING THE WATER SYSTEM AND EVAPORATOR . RESTORING ICE THICKNESS POTENTIOMETER TO FACTORY SETTING . COMPONENT FUNCTION (CIRCUIT BOARD ETC. ) . [. . . ] 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. Should this not correct the problem, replace the valve diaphragm. This can be done without entering the sealed refrigeration system. 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. Remove compressor oil and refrigerant charge. Evacuate, install liquid and suction line driers (acid hold type). [. . . ] In the event the control appears to be "stuck in bypass", the pressure drop across the headmaster must be measured. With a gauge installed at the receiver outlet valve and the high side service valve, the pressure difference at these two points must be less than the 15 PSI. The three most common causes of an excessive pressure drop are shortage of refrigerant, kinked remote lines, and excessive line length. Add refrigerant in two-pound increments (not to exceed six pounds) to determine if it corrects the pressure drop. [. . . ]