User manual SCOTSMAN MCM1462R

[. . . ] MCM1462R 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 . [. . . ] 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 BIN ICE LEVEL SELECTOR SWITCH April, 1993 Page 15 MCM1462R 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. 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. SONAR SCHEMATIC ICE/OFF/WASH SWITCH THE USER MAY SELECT THE AMOUNT OF ICE TO BE MAINTAINED IN THE BIN. BIN ICE LEVEL SELECTOR SWITCH SOUND WAVES 8" FULL 3/4 1/2 1/4 April, 1993 Page 16 MCM1462R 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. Clean the water strainer frequently. WATER DISTRIBUTORS SUMP STAND PIPE OPTIONAL WATER FILTER HAND VALVE SUMP PUMP COMPONENT LOCATION April, 1993 Page 17 DRAIN CAP MCM1462R CLEANING ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// A Scotsman Ice System represents a sizable investment of time and money in any company's business. In order to receive the best return for that investment, it MUST receive periodic maintenance. Maintenance and Cleaning should be scheduled at a minimum of twice per year. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 7. [. . . ] · This system has a critical charge, it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine, or performance will suffer. · Anytime the refrigeration system has been opened, the dryer should be replaced. · When brazing the tubing connections to the hot gas valve or thermostatic expansion valve, the component must be protected by heat sink material. There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700. [. . . ]