User manual SCOTSMAN CME1000A

[. . . ] CME855A & CME1000A INTRODUCTION This manual is intended as a reference for the installation of a Scotsman ice maker models CME855 and the CME1000. TABLE OF CONTENTS SPECIFICATIONS . page 3 FOR THE INSTALLER: Environmental Limitations . page 4 FOR THE INSTALLER: Machine & Bin Assembly . page 7 FOR THE ELECTRICIAN: Electrical Connections . [. . . ] Timer - Timer & Switch Assembly The timer begins to turn when activated by the cube size control. The outer surface, or large diameter lobe of the timer cam, determines the length of time for finish freezing of the ice cubes, while the inner surface, or small diameter lobe, determines length of the harvest cycle. The single-pole, double throw microswitch on the timer controls the power to the plug in relay coil, making it either the freezing or harvest cycle. The microswitch is actuated by the cams connected to the timer motor. The timer cam can be adjusted to vary the defrost time, as required. One complete rotation of the cam will take eight minutes. October, 1994 Page 15 Hot Gas Solenoid Valve The hot gas solenoid valve opens only during the harvest cycle. When it opens, it diverts the hot discharge gases so that they flow directly into the evaporator plates, by-passing the condenser and thermostatic expansion valve. The hot gases warm the evaporators, releasing the ice cubes from the ice cube molds. The hot gas solenoid valve is installed in a branch of the discharge line, and when the timer switches the ice machine into the harvest cycle, the energized solenoid coil lifts the valve stem within the valve body, allowing the hot discharge gas to be diverted to the evaporators. High Temperature Cut Out This temperature sensor is located next to the hot gas valve, on the outlet side. During normal operation, it does not affect the ice machine, but it will shut the machine off if the hot gas line overheats. It is an automatic reset. CME855A & CME1000A COMPONENT DESCRIPTION Electric Water Inlet Valve The water inlet solenoid valve fills the reservoir assembly with water. Excess water overflows out the overflow standpipe located at the back of the reservoir. This action fills and rinses the reservoir during each harvest cycle. Water Distribution System The water distribution system evenly supplies water to all cells of the evaporator plates. The water pump pumps water from the reservoir up the vertical tygon tube to the tee. From there water is channeled through the water manifold to the water distributors, above each evaporator plate, and from six holes within each distributor, water flows to the cells of each side of the evaporator plates. Gravity flow returns the unfrozen excess portion of water to the reservoir for recirculation. Reservoir The reservoir, located below the evaporators, stores the inlet water charge, and collects the water that flows over the evaporator plates. Most ice will be falling into the bin below the center evaporator. High Pressure Cut Out This is a manual reset control that shuts down the ice maker, should the discharge pressure ever reach 450 PSIG. WATER DISTRIBUTION SYSTEM EVAPORATOR WATER PUMP RESERVOIR ELECTRIC WATER VALVE December, 1994 Page 16 CME855A & CME1000A SERVICE SPECIFICATIONS: CME855A When servicing a machine, it's helpful to compare that unit's operating characteristics to those of a new, clean, normally operating machine. What follows is that type of information: Numbers = Cabinet Air Temp/Water Temp. [. . . ] · Anytime the refrigeration system has been opened, the dryer should be replaced. Note: Only a HFC type dryer can be used. · When brazing the tubing connections to components such as the TXV, the component must be protected by heat sink material. Recover, reclaim or recycle refrigerant . [. . . ]