User manual SCOTSMAN CME500R

[. . . ] CME500R INTRODUCTION To the owner or user: This service manual is intended to provide you and the maintenance or service technician with the information needed to install, start up, clean, maintain and service this ice system. The CME500R uses HP62 as the refrigerant, and polyolester oil for compressor lubrication. Table of Contents INTRODUCTION . 28 Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. October 1994 Page 1 CME500R FOR THE INSTALLER The CME500R will fit the following Scotsman ice storage bins: A remote condenser and precharged tubing kit are required to assemble this ice system. An optional stainless steel panel kit (SPKCMD-1) can be field installed. [. . . ] Observe size of ice cubes in the next cube harvest and adjust in one eighth turn or less increments, until correct ice cube size is achieved. The machine will have to harvest all of the cubes before it goes back into the freeze cycle. Increase the Harvest Time if there is less than 15 seconds of harvest time after the last cube has fallen into the bin. Decrease the Harvest Time if there is much more than 15 seconds of harvest time after the last cube has fallen into the bin. Note: Harvest time is dependent upon the water and air temperatures at the ice machine. Colder air and water will result in faster ice making, but longer harvest cycles. Do NOT adjust harvest time too short, as this will cause a freeze up of the evaporators. CONTROL BOX TOO SMALL JUST RIGHT CUBE SIZE DIAGRAM When the cubes are the correct size, they will be connected together vertically, and drop off in strips. The batch weight per cycle should be about 5. 5 lb. To Adjust Harvest Time: A. Loosen set screw holding the two halves of the cam together, and rotate the front half to increase or decrease the harvest portion of the cam (low part). Reconnect power and check the cube size after the next cycle (cube size may need adjustment). Replace control box cover and all cabinet panels and screws. CUBE SIZE 13. Check operation of the bin control by holding CONTROL ice on the bin control tube in the bin. Thoroughly explain to the owner/user the significant specifications of the icemaker, the start up and operation, going through the procedures in the cleaning instructions. Answer all questions about the icemaker by the owner; and inform the owner of the name and telephone number of the local authorized SCOTSMAN Distributor, or service agency. BIN ICE LEVEL SWITCH March 1994 Page 14 CME500R FREEZING CYCLE OPERATION Water from the sump assembly is pumped to the water distributor system at the top of each evaporator plate. From the water distributor the water cascades by gravity over all cells of the plate and to the sump assembly below. At the beginning of the freezing cycle, the electrical circuit is completed to the compressor and the water pump. The water pump operates continuously, through both the freezing cycle and the harvest cycle. During the freezing cycle, the hot gas solenoid valve is CLOSED and the water inlet solenoid valve is CLOSED. When the ice cubes are partially formed, the cube size control will sense the temperature at which it is preset to CLOSE. The timer will keep the icemaker operating in the freezing cycle for a selected length of time. After that selected length of time, the timer will switch the icemaker into the harvest cycle, through the contacts of the timer assembly microswitch. Low Temperature Freeze: When the outside air temperature is low, the Head Pressure Regulator will close off the liquid line to the receiver, causing liquid refrigerant to back up into the condenser until the head pressure builds up to 240 PSIG. [. . . ] · When the system is serviced, a special liquid line dryer is required (see parts list). · Polyolester oil absorbs water very easily, and therefore when the system is opened for service, it must be re-sealed as soon as possible (15 minutes maximum). · Special leak detection equipment is required to locate small refrigerant leaks. Usually a leak detector capable of detecting a Halogenated refrigerant or HFC-134a will work. [. . . ]