User manual SCOTSMAN CMS1402R

[. . . ] CMS1402R 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 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. 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. Located below the control box. CONTROL BOX CUBE SIZE CONTROL RELAY TIMER & SWITCH September 1993 Page 14 CMS1402R 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. BIN ICE LEVEL SELECTOR SWITCH Because it uses sound waves, a slight "ticking" sound can be heard coming from the bottom of the machine. There are three parts to the control, the transducer, the circuit board, and the ice level control switch. ICE/OFF/WASH SWITCH THE USER CAN SELECT THE AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. SOUND WAVES FULL PARTIAL September 1993 Page 15 CMS1402R COMPONENT DESCRIPTION Water Inlet Solenoid Valve The water inlet solenoid valve fills the sump assembly with water and excess water overflows out the standpipe and down the drain. Water Distribution System The water distribution system evenly supplies water to all cells of the evaporator plates. The water pump pumps water from the sump 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 sump reservoir for recirculation. Hot Gas Solenoid Valve The hot gas solenoid valve functions only during the harvest cycle, to divert the hot discharge gas from the compressor, by passing the condenser, for direct flow in the evaporator plates to release ice cubes from the ice cube molds. The hot gas solenoid valve is installed in a branch of the discharge line. When the harvest cycle begins the energized solenoid coil lifts the valve stem within the valve body, to cause the hot discharge gas to be diverted to the evaporators. Strainer A water strainer is located in the potable inlet water line before the water inlet solenoid valve. [. . . ] If the triple evacuation method is used, the vacuum should be broken each time with dry nitrogen, not refrigerant. · Check for leaks with a high quality, electronic leak detector. · Scotsman's schrader valve caps must be tightened to 70 inch - pounds to insure that the valves will not leak. If an ice machine is to be discarded and still contains refrigerant, Scotsman recommends that the refrigerant be recovered, reclaimed, or recycled so that it is not discharged into the air. · Refrain from checking refrigeration pressures without reason. [. . . ]