MCM1062W INTRODUCTION This manual is intended as a reference for the installation of a Scotsman ice maker model MCM1062. TABLE OF CONTENTS Page Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Environmental Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 For the Installer Machine & Bin Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCM1062W SPECIFICATIONS Always refer to the nameplate, located on the back of the cabinet, for the: • model number, • serial number, • basic electrical requirements, • minimum circuit ampacity, • maximum fuse size, • and refrigerant charge. A serial number plate with the model number, serial number and refrigerant charge is located behind the front panel, near the control box. The unit comes from the factory with the correct refrigerant charge.
MCM1062W FOR THE INSTALLER: Environmental Limitations Installation Limitations Water Limitations The ice making portion of this ice system is designed to be installed indoors, in a controlled environment. An ice machine is a food manufacturing plant; it takes a raw material, water, and turns it into a food product, ice. The purity of the water is very important in obtaining pure ice and in maximizing product life.
MCM1062W FOR THE INSTALLER: Machine & Bin Assembly Overview: Ice Maker: This ice system is comprised of 2 major assemblies: 1. Arrange for proper electric, water and drain. See instructions for the plumber and for the electrician. 1. The ice storage bin. 2. The ice maker itself. 2. Position the ice storage bin in the selected location. Storage Bin: 3. Level the bin, in both the front to rear and side to side directions. Tighten the caster set screws when the leveling is complete. 1.
MCM1062W FOR THE PLUMBER Water Supply The recommended water supply line is a 3/8-inch O.D. tubing with a minimum operating pressure of 20 PSIG and a maximum of 80 PSIG. A separate water inlet is required for the condenser water supply. Connect to cold water supply line with standard plumbing fittings, with shut off valve installed in an accessible place between the water supply and the cuber. ln some cases a plumber will be required.
MCM1062W FOR THE ELECTRICIAN: Electrical Connections See the NAMEPLATE for current requirements to determine wire size to be used for electrical hookup. The cuber requires a solid chassis to chassis earth ground wire. See Wiring Diagram. Be certain the cuber is connected to its own electrical circuit and individually fused. Voltage variation should not exceed ten percent of the nameplate rating, even under starting conditions.
MCM1062W FOR THE INSTALLER: Final Check List 1. Is the ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified? 2. Is there clearance at both sides of the cabinet and at the back and top for service and utility connections? 3. Has water supply pressure been checked to insure a minimum of 20 PSIG and a maximum of 80 PSIG operating pressure? 4. Is the cabinet level? 5. Check that any shipping material has been removed from inside the cabinet. 6.
MCM1062W INITIAL START UP Ice Maker: 1. Remove front panel by pulling out to unsnap. 2. Remove two screws and the control box cover. 3. Remove the evaporator cover. 4. Remove the left side service panel. 5. Check that the ON/WASH/OFF rocker switch and the Compressor ON-OFF toggle switch are in the OFF position, on the control box. 6. OPEN the water supply line shut off valve. 7. Inside the control box is the shaft of the timer and the switch assembly.
MCM1062W INITIAL START UP 15. Check Harvest Time.There must be enough time in harvest to defrost all the cubes but not an excessive amount that will waste capacity. The length of the harvest cycle is determined by the timer cam positions. If needed, adjust the harvest time so there are about 15 seconds of harvest time left after the last cube has fallen from the evaporators.
MCM1062W ADJUSTMENT OF THE TIMER & SWITCH ASSEMBLY One complete revolution of the cam on the timer represents eight minutes. If left as factory set, four and one-half minutes comprise the freezing cycle portion during cam rotation, and the final three and one-half minutes is the defrost/harvest cycle. Rotating the shaft of the timer cam Clockwise will put the ice machine into the freeze or harvest cycle, as required in the cleaning instructions.
MCM1062W COMPONENT DESCRIPTION Compressor Contactor Hot Gas Solenoid Valve The compressor contactor carries the compressor line current. The contactor is wired so any control in the pilot circuit, such as the bin control, and high pressure controls, etc., will cause the contactor holding coil to be de energized, when the control contact OPENS, thereby breaking the circuit to the compressor. The hot gas solenoid valve opens only during the harvest cycle.
MCM1062W COMPONENT DESCRIPTION Ice 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. It will not fill any closer to the ice machine than 8", and will not work if the distance to the bottom of the bin is greater than 8 feet.
MCM1062W COMPONENT DESCRIPTION Electric Water Inlet Valve Reservoir 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. The flow rate is .75 g.p.m. The reservoir, located below the evaporators, stores the inlet water charge, and collects the water that flows over the evaporator plates.
MCM1062W SERVICE SPECIFICATIONS 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: COMPONENTS Timer: Makes one complete revolution in 8 minutes. The harvest time is factory preset at 2 1⁄4 minutes. The harvest time is adjustable as required. Inlet Water Valve: Opens and admits 3⁄4 gallon per minute during the harvest cycle.
MCM1062W 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.
MCM1062W CLEANING SANITIZE WATER SYSTEM SANITIZE ICE STORAGE BIN 1. Remove and discard all ice from the bin. This procedure is to be done monthly 2. Remove front panel. 1. Remove and discard all ice from the bin. 3. Drain the reservoir 2. Switch the ice maker off. 4. Prepare 2.5 gallons of McDonald’s Sanitizer solution in accordance with the instructions on the package. 2. Prepare 2.5 gallons of McDonald’s Sanitizer solution in accordance with the instructions on the package. 5.
MCM1062W SERVICE DIAGNOSIS SYMPTOM POSSIBLE CAUSE PROBABLE CORRECTION No ice, machine does not run 1. No electrical power 1. Restore power 2. Circuit breaker tripped or fuse blown 2. Reset breaker or replace fuse, check for electrical fault. 3. High pressure control open. 3. Reset HPC, check fan motor for proper operation, and condenser coil for dirt. 4. ice level control holding machine off 4. Check ice level control circuit. See page 19. 5. High temp. cut out open 5.
MCM1062W SERVICE DIAGNOSIS SYMPTOM POSSIBLE CAUSE PROBABLE CORRECTION Low ice production 4. High head pressure, a result of a dirty condenser 4. Clean water circuit of condenser 5. Hot gas valve leaks thru 5. Replace hot gas valve 6. High discharge pressure 6. If possible, reduce condenser water inlet temperature. 1. Cube size control will not close 1. Check temp. of suction line, cube size control will not close if temp. too high. If temp. low enough, replace cube size control 2.
MCM1062W SERVICE DIAGNOSIS: Ice Level Control Circuit CONDITION DETERMINE CAUSE PROBABLE CORRECTION Ice Machine does not run, it has power to it, the high pressure control is closed, the on/off switch is set to ON. A. Listen for a ticking sound from transducer. If no noise, go to C. If there is a noise, check for a light on the board (models built after 4/93). If there is a light on, check relay contacts N.O. and COM. The contacts should be CLOSED. If closed, go to D. If not, replace the board.
MCM1062W REMOVAL AND REPLACEMENT TRANSDUCER 1. Disconnect electrical power BEFORE removing transducer. 5. Unplug transducer and remove from the machine. 2. Open bin door and locate the transducer socket. 6. Reverse steps 1-5 to reassemble. 3. Twist inner portion of transducer counterclockwise and push up gently. 4. Pull transponder down until plug connection is accessible.
MCM1062W REMOVAL AND REPLACEMENT /////////////////////////////////WARNING///////////////////////////// Inlet Water Solenoid Valve Assembly Disconnect electrical power before beginning. To remove the inlet water solenoid valve assembly: /////////////////////////////////////////////////////////////////////////////// 1. Shut OFF water supply to machine. Cube Size Control ELECTRICAL CORD To remove the cube size control: 1. Remove front panel. SOLENOID VALVE 2. Remove cover from control box. 3.
MCM1062W REMOVAL AND REPLACEMENT /////////////////////////////WARNING////////////////////////////////// Hot Gas Valve Disconnect electrical power before beginning. 1. Remove the side service panel, and top panel if possible. ///////////////////////////////////////////////////////////////////////////////// 2. Discharge and recover the refrigerant from the system. Water Pump 1. Remove front panel. 3. Remove the electrical connections from the coil of the valve 2. Remove evaporator cover. 3.
