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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.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location & Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Harvest Cycle Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Lists and Wiring Diagrams are located in the
center of this manual, printed on yellow paper.
This manual was printed on recycled paper.
Table of Contents
April, 1993
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Summary of Contents for Scotsman MCM1462R
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Page 1: Table Of Contents
Removal and Replacement ......Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. This manual was printed on recycled paper. Table of Contents April, 1993 Page 1 MCM1462R... -
Page 2: For The Installer
** The unit is shipped with the full charge in the receiver. For re-charging purposes, if the nameplate charge is different than this number, go by the nameplate. Use Scotsman remote condenser RC1422, or Mac 6. Use precharged tubing kit MLS2255 (55’) or MLS2265 (65’) or MLS2275 (75’). -
Page 3: Location & Assembly
Use bolts and straps found on the back of the ice machine to secure the ice machine to the bin. When alignment and leveling are completed, tighten the bolts to secure the mounting straps. -
Page 4: For The Installer Location & Assembly
Install the panel retaining bracket onto the bottom ice machine before placing the upper unit on it. Place additional gasket onto the top edges of the bottom ice machine. Carefully lift the uncrated top unit onto the bottom one and align the two cabinets. - Page 5 FOR THE INSTALLER: Scotsman Remote Condenser Locate the condenser as near as possible to the interior location of the ice maker. Location of the condenser is limited by the specific length of precharged refrigerant tubing supplied for the application. The pre-charged tubing connects the icemaker to the remote condenser.
- Page 6 Mac 6 Connections: The condenser circuits used for the ice machine are located in the area shown, and are labeled. This Scotsman ice machine uses R-22, be certain that the circuit being used also contains R-22, not dry air or R-502.
- Page 7 1/4 turn is made. 5. After all connections are made, and after the king valve has been opened, check the couplings for leaks. LIQUID LINE April, 1993 Page 7 MCM1462R TIGHTENING THE QUICK CONNECTS...
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Page 8: For The Electrician
DISCONNECT SWITCH POWER SUPPLY The Scotsman remote condenser is designed to be powered from the ice machine. There is a separate electrical junction box at the back of the ice maker for the remote condenser. Wire the remote condenser to the ice maker in accordance with local and national electric codes. -
Page 9: For The Plumber
Water Limitations: An ice machine is a food manufacturing plant, it takes in 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. -
Page 10: Final Check List
Registration form been properly LEVEL ASSEMBLY filled out? Check for correct model and serial numbers from Serial nameplate, then mail to the SCOTSMAN factory. 12. Has the owner/user been given the Service Manual and SUMP DRAIN instructed how to operate and OPTIONAL... - Page 11 OFF position, on the control box. 2. Switch on the electrical power. Electrical power must be supplied to the ice machine for 12 hours before starting the compressor for the first time. The crankcase heater will now heat the compressor’s oil.
- Page 12 It will not fill up closer than 8" from the bottom of the ice machine, and will not work on bins taller than 8’. Note: Even when full the unit will make one batch of ice when the ICE/OFF/WASH switch is moved from ICE to OFF to ICE.
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Page 13: Freezing Cycle Operation
220 PSIG. While this is occuring, the head pressure regulator passes discharge gas into the receiver to keep the refrigerant flowing. WATER DISTRIBUTION INLET WATER VALVE DRAIN WATER SCHEMATIC REFRIGERATION SCHEMATIC April, 1993 Page 13 MCM1462R RESERVOIR... - Page 14 MCM1462R HARVEST CYCLE - HOT GAS BYPASS When the timer switches the icemaker into the harvest cycle, high pressure, high temperature gas refrigerant being discharged from the compressor is diverted from the condenser through the hot gas solenoid valve into each evaporator plate. During this cycle, the refrigerant bypasses the condenser.
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Page 15: Harvest Cycle Operation
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. TIMER & SWITCH BIN ICE LEVEL SELECTOR SWITCH April, 1993 Page 15 MCM1462R CUBE SIZE CONTROL RELAY... -
Page 16: 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. - Page 17 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 PUMP DRAIN CAP April, 1993 Page 17 MCM1462R...
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Page 18: Cleaning
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. - Page 19 Scale that may form on the plastic liner of a bin may be removed by scrubbing the surface of the line with a mixture of Scotsman Ice Machine Cleaner and hot water. Remove any scale prior to sanitizing.
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Page 20: Specifications
Bin or Ice Level Control Maximum Full Height: ....8" from the base of the ice machine Maximum Storage Bin Interior Height ... . 8 feet from the base of the ice machine Freeze Cycle (90/90/70) Average Discharge Pressure . -
Page 21: Adjustments
More of an opening between the cams = more harvest time. The harvest time may be reduced if not needed. This will yield more ice per day. TIMER April, 1993 Page 21 MCM1462R CLOSE UP VIEW OF TIMER SWITCH ACTUATOR... -
Page 22: Service Diagnosis
MCM1462R SERVICE DIAGNOSIS: Water SYMPTOM No ice is made Cubes are not uniform in shape Long Freeze Cycle Makes thick ice/freezes up Cubes too large Low Capacity Unit runs out of water POSSIBLE CAUSE Inlet water valve will not open or is... - Page 23 (low condensing temp.) Low pressure control will not close Contactor coil open Compressor windings open Loose connection in PC board April, 1993 Page 23 MCM1462R PROBABLE FIX Reconnect power Reset, check machine Hot gas valve leaks thru, replace Replace board Test/replace...
- Page 24 MCM1462R SERVICE DIAGNOSIS: Refrigeration and/or Mechanical SYMPTOM Poor harvest Unit cycles off during freeze or harvest Low capacity Unit shuts off before bin is full Compressor cycles on and off Frost on compressor POSSIBLE CAUSE Hot gas valve does not open Head pressure control valve does not maintain enough head pressure.
- Page 25 SERVICE DIAGNOSIS: Bin Ice Level Control CONDITION Ice Machine does not run, it has power to it, the high pressure control is closed, the on/off switch is set to ON (the compressor will not operate until the liquid line valve opens, but the pump should be working if there is no ice in the bin).
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Page 26: Removal And Replacement
MCM1462R REMOVAL AND REPLACEMENT Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. Water Distributor Tubes And Manifold Tubes To remove the water distributor tube and manifold tube: 1. Remove the front panel. - Page 27 4. Use corbin clamp pliers to loosen and slide corbin clamps on hoses away from pump. 5. Remove screws retaining pump to bracket. 6. Pull pump out of ice machine. 7. Reverse to reassemble. 8. Replace front panel. 8. Reconnect electrical power.
- Page 28 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. Reclaim programs are available thru most refrigerant wholesalers.
- Page 29 12 hours. If the compressor was warm throughout the replacement process, the ice machine may be restarted without waiting to re-warm the compressor. Refrigerant: NO liquid refrigerant may be put into this system anywhere except the receiver.
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Page 30: Refrigeration Service
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. Reclaim programs are available thru most refrigerant wholesalers.