User manual SCOTSMAN CMS1202R

[. . . ] CMS1202R 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. Table of Contents Specifications . For the Installer Location & Assembly Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 7 8 9 10 12 13 15 17 19 20 21 25 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . For the Electrician For the Plumber Final Check List Initial Start Up . [. . . ] The compressor will continue to run until the pump down control, sensing low side pressure, opens at 20 PSIG. WATER DISTRIBUTION INLET WATER VALVE DRAIN RESERVOIR WATER SCHEMATIC REFRIGERATION SCHEMATIC September 1993 Page 13 CMS1202R COMPONENT DESCRIPTION Cube Size Control This reverse acting thermostat controls the length of the freezing cycle. It is sensing the temperature of the suction line. When the suction line gets cold enough, the cube size control closes (on temperature fall) and starts the timer. A change in either ambient air or incoming water temperature will affect the efficiency of the refrigeration system, and this will vary the length of time it takes the evaporator to reach the temperature at which the cube size control is preset to close. See CUBE SIZE ADJUSTMENT BEFORE attempting to adjust the control. Relay The multi-function, three pole, double throw, plug-in relay is installed directly into a receptacle on the printed circuit board in the control box. The relay functions in part to by-pass the bin thermostat control to prevent the icemaker from shutting OFF, when the bin thermostat opens during the freezing cycle. The bypass action serves to ensure full-sized ice cubes with each harvest cycle. Timer - Timer & Switch Assembly The function of the timer begins when activated by the cube size control. The outer surface, or large diameter lobe of the timer cam, determines the timer cycle for finish freezing of the ice cubes, while the inner surface, or small diameter lobe, determines the time cycle for the harvest cycle. When the microswitch button is pushed in there is power connected to the coil of the relay, and the unit is in the freeze cycle. When the microswitch button is released, the power to the relay is stopped, and the unit goes into harvest. The microswitch is actuated by a cam assembly directly connected to the timer motor. One complete rotation of the cam will take eight minutes. Harvest is preset at three and one half minutes, but is adjustable. High Pressure Safety Control This is a manual reset control that shuts down the icemaker, should the discharge pressure ever reach 400 PSIG. Low Pressure Control (Pump Down) This pressure control connects power to the compressor contactor coil. Its Cut In is 35 PSIG and its Cut Out is 20 PSIG. Located below the control box. CONTROL BOX CUBE SIZE CONTROL RELAY TIMER & SWITCH September 1993 Page 14 CMS1202R COMPONENT DESCRIPTION Bin Level Control This electronic control uses sound waves to measure the distance between the bottom of the ice machine and the top of the ice in the bin. It is designed to control the machine's ice production to maintain that distance. The control is adjustable so that the ice machine will maintain a certain height of ice. When set at FULL it will not allow the machine to fill the bin any closer to the ice machine than about 8", and it will not work if the distance to the bottom of the bin is greater than 8 feet. [. . . ] Pull circuit board of off fastener posts. Reverse to reassemble, refer to wiring diagram as needed. REMOVAL OF THE INLET WATER VALVE STRAINER 1. Loosen and remove outlet water line from the inlet water solenoid valve assembly. Remove screws and pull the water solenoid valve out to gain access. INLET WATER VALVE September 1993 Page 26 CMS1202R REMOVAL AND REPLACEMENT Thermostatic Expansion Valve 1. [. . . ]