Scotsman CME250 User Manual
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Scotsman CME250 User Manual

Scotsman CME250 User Manual

Scotsman cme250 ice machine: user guide
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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 repair this
product.
The CME250 is an ice machine that produces
cubed ice on 2 vertical cube freezing surfaces. The
cubes fall as vertical strips of cubes into the ice
storage bin where they break up into individual
cubes. The CME250 automatically maintains the
level of ice by turning on when the ice level falls,
and switches off when the bin is full.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2
Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9
Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11
Technical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18
Refrigeration Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 23
Parts lists and wiring diagrams are located in the
center of this manual, printed on yellow paper.
Note the warning symbol where it appears in this
manual. It is an alert for important safety
information on a hazard that might cause serious
injury.
Keep this manual for future reference.
This manual was printed on recycled paper.

Table of Contents

The refrigeration system uses HP62 as the
refrigerant. HP62 models use polyolester
refrigerant oil.
Information on HP62 is located on page 23.
August 1994
Page 1
CME250

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Summary of Contents for Scotsman CME250

  • Page 1: Table Of Contents

    The CME250 is an ice machine that produces cubed ice on 2 vertical cube freezing surfaces. The cubes fall as vertical strips of cubes into the ice storage bin where they break up into individual cubes.

  • Page 2: Specifications

    W" x D" x H" CME250AE-1E 30 x 24 x 27 CME250WE-1E 30 x 24 x 27 Nameplate The CME250 will stack onto a variety of Scotsman ice storage bins: *BH550 *HTB500, HTB350, HTB250 BH800 (with bin top KBT23) BH900 (with bin top KBT22)

  • Page 3: Limitations

    They meet or exceed the standards of UL, NSF, and CSA. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any part and/or other components not specifically approved by Scotsman.

  • Page 4: Installation

    It must be installed indoors, in a controlled environment. The air and water temperatures must not exceed rated limits. Pre-installation: 1. Inspect the place where the ice machine is to be installed. Check for: space for the cabinet, water supply, drain availability and electrical power supply.
  • Page 5 3. Line up the ice machine, check that there is a Capillary Tube good seal between the ice machine and the storage bin. 4. If on a Scotsman bin, attach the ice machine to Bin Thermostat the bin using the straps and bolts shipped with the Bracket ice machine.

  • Page 6: Plumbing

    A loop of copper tubing may be used between the ice machine and the water supply. This will allow the ice machine to be pulled out from its installed location without disconnecting the water line. No back-flow preventer should be needed in the inlet potable water line because provision for that is incorporated in this N.S.F.

  • Page 7: For The Electrician

    Follow All Local Codes - This Unit Must Be Grounded . Usually a licensed electrician will be required to connect the electrical service. For The Electrician " of Hand Disconnect Switch Junction Box August 1994 Page 7 CME250...

  • Page 8: Final Check List

    Scotsman. 13. Has the owner/user been given the name and telephone number of the authorized Scotsman Service Agency serving that location? October 1994 Page 8...

  • Page 9: Component Location

    Component Location The ice machine is designed for front service. Many components are serviceable from the front without removing the side panels. Behind the front panel: Water pump Inlet water valve Reservoir Evaporators Water distributor Control box with cube size control adjustment...
  • Page 10 CME250 COMPONENT DESCRIPTION: Control System 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.

  • Page 11: Initial Start Up

    Note: In some cases some slush will form in the reservoir. This is temporary and normal. 9. Allow the ice machine to operate for about 20 minutes. The ice should be fully formed and should be harvested within a few minutes.

  • Page 12: Electrical Sequence

    Note: Harvest time is dependent upon the water and air temperatures at the ice machine. Colder air and water will result in faster ice making, but longer harvest cycles. Do NOT adjust harvest time too short, as this will case a freeze up of the evaporators.

  • Page 13: Cleaning

    4 times a year. This ice machine will perform at its best when kept clean. There are two areas to keep clean: The water system including the water reservoir, distributor tube and evaporator surface;...
  • Page 14 3. Allow to air dry. Note: Always replace bin baffle if removed when cleaning. To Remove Scale: 1. Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of hot F.-110 F.) water. 2. Using rubber gloves, dip a nylon scouring pad into the cleaning solution and scrub the scale off the liner.
  • Page 15 KEEP OUT OF THE REACH OF CHILDREN. 7. Mix 8 ounces of Scotsman Ice Machine Cleaner with 1 gallon of warm (95 F. - 115 pour into the reservoir until full. 8. Switch the master switch ON, and operate the unit for 20 minutes, then switch the unit OFF.

  • Page 16: Water/ Refrigeration Schematic

    Valve Water Reservoir Water Schematic: Water flows into the ice machine from its inlet connection at the back of the cabinet, through the inlet water valve and into the reservoir. The water in the reservoir is pumped up and through the water distributor tube at the top of the evaporators.

  • Page 17: Harvest Cycle

    Hot Gas Valve (OPEN) Water Distribution System Thermo. Exp. Valve Discharge Line Refrigeration Schematic August 1994 Page 17 CME250 Suction Line Liquid Line Condenser Fan Motor Hot Gas Valve Filter Dryer Compressor...

  • Page 18: Technical Characteristics

    CME250 Technical Characteristics Typical Cycle Time 21 minutes @ 90 F. air and 70 16 minutes @ 70 F. air and 50 Typical Harvest Ice Weight 2.5 - 3 pounds. Typical Low Side Pressure Just Before Harvest Air cooled = 35 PSIG; Water cooled = 28 PSIG...

  • Page 19: Service Diagnosis

    No cooling at evaporator due to fan not turning No cooling at evaporator due to dirty condenser August 1994 Page 19 CME250 PROBABLE FIX Restore power Switch master switch to ON Check temperature at bin thermostat bracket, if warmer than 40 F., thermostat should be...
  • Page 20 Replace if found to be faulty. Adjust harvest time longer. Check water supply & distribution system. Clean water system with Scotsman Ice Machine Cleaner. Check for causes of high discharge pressure and correct. Advise user, suggest additional room cooling.

  • Page 21: Removal And Replacement

    Pull it out of the socket. 10. Replace the cube size control with the proper part number, following the above steps from 9-1. Cube Size Pig-Tail Suction Line Replacement of Cube Size August 1994 Page 21 CME250 Socket...
  • Page 22 3. Remove the screws holding the valve to the bracket. 4. Unplug the electrical connection from the valve. 5. Remove the valve from the ice machine. 6. Reverse the above steps to reassemble. Inlet Water Valve Inlet Water Valve...
  • Page 23 62 ..127 64 ..132 66 ..136 68 ..141 August 1994 Page 23 CME250 VAPOR TEMP. PRESSURE (DEG F) (PSIG) 70 .

  • Page 24: 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 700-88. Reclaim programs are available through most refrigerant wholesalers.

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