Page 1: Table Of Contents
Service Diagnosis · · · · · · · · · · · PAGE 32 Service Diagnosis: Components · · · · PAGE 33 Service Diagnosis: PTCR · · · · · · · PAGE 34 Operational Characteristics: CME306 · PAGE 35 Operational Characteristics: CME456 · PAGE 36 Removal and Replacement: Water Level Sensor ·...
Page 2: Specifications
Voltage (208-230 v models) Voltage (50 Hz models) Inlet water flow required is 1.25 GPM. All models will fit a standard, 22" wide Scotsman Ice Storage Bin such as the BH360. Note: Slope front bins may need an internal baffle.
Page 3: Air Cooled Layout
Ice Opening BACK VIEW 3.16 in 8.0 cm 6.40 in 16.3 cm 9.15 in 23.2 cm January 2000 Page 3 CME306 & CME456 1.75 in 4.4 cm 16.7 in 42.4 cm AIR COOLED CONDENSER .88 DIA. HOLE ELECTRICAL INLET WATER INLET 3/8"...
Page 4: Water Cooled Layout
CME306 & CME456 Water Cooled Layout Bin Stat Bracket Mounting Holes Bin Stat Thru Hole 12.88 in 32.7 cm 3.75 in 9.5 cm ELECTRICAL INLET 7.39 in 18.8 cm 4.54 in 11.5 cm 11.38 in 28.9 cm 1.25 in 3.2 cm 2.63 in...
Page 5: Pre-Installation
Nameplate on Back Panel Serial Number Plate, Remove Front Panel to Locate Note: Slope front bins must have an internal baffle. Scotsman’s BH375 has the required baffle. Baffle must be approximately in the position shown in the diagram. Side View...
Page 6: Location
CME306 & CME456 Location Air cooled models take room temperature air in from the left side and discharge warm air out the back. Do not place them where the heat and noise will be objectionable. A 6 inch MINIMUM clearance between the back...
Page 7 HTB555: Use KBT27 BH550: Use KBT27 and Kbaffle1 Other Brand’s Bins: KBT27 may allow installation of this unit on a non-Scotsman 30” wide bin. Thermostat kit KSTAT-22 must be used if the bin’s baffle is too short. May 2004...
Page 8: On A Beverage Dispenser
CME306 & CME456 On a Beverage Dispenser The CME306 or CME456 will mount on top of many brands of ice and beverage dispensers. The brands include Scotsman, Cornelius and Lancer. Scotsman and Cornelius use the same adapter kits. 22” wide ice dispensers use KBT42, while 30”...
Page 9: On A Motel Dispenser
CME306 & CME456 On a Motel Dispenser Either the CME306 or the CME456 may be placed on a Motel Dispenser. No thermostat is required when used on either the SLD150 or the HD150, or HD156 or HD22. Scotsman model SLD150 may be used, but the back portion of the top must be removed and replaced with the KDT22 kit.
Page 10: Cabinet Panel Removal
CME306 & CME456 Cabinet Panel Removal: Note: The top panel holds the upper edges of the side panels in place. 1. Remove the front panel by removing the two screws connecting the top edge of the front panel to the machine, then pull out at the bottom.
Page 11: Bin Thermostat: Optional Installation
The normal bin control is the ice sensor set. An option, required in some cases, is a thermostat. Its bulb must be deployed after the ice machine has been placed on the bin or dispenser. Note: Some configurations may have parts that vary from these instructions.
Page 12: Plumbing - Air Cooled
The ice storage bin will have a drain out the back or base, depending upon the model. The drain for the ice machine and the ice storage bin must be SEPARATE or the ice machine’s drain water may run into the bin and MELT THE ICE.
Page 13: Plumbing - Water Cooled
The ice storage bin will have a drain out the back or base, depending upon the model. The drain for the ice machine and the ice storage bin must be SEPARATE or the ice machine’s drain water may run into the bin and MELT THE ICE.
Page 14: Electrical
CME306 & CME456 Electrical All models must be installed with the correct wire Follow all Local, State and National codes. size and type per the National Electric Code. Locate the nameplate on the back of the cabinet and find the numbers for Voltage, Phase, Minimum Water Cooled Circuit Ampacity and Maximum Fuse Size.
Page 15: After Utility Connections
____9. Is the water pressure adequate? ____10. Have the drain connections been checked for leaks? ____11. Has the bin interior been wiped clean or sanitized? ____12. Have any water filter cartridges been replaced? CME306 & CME456 January 2000 Page 15...
Page 16: Component Description And Function
CME306 & CME456 Component Description and Function Reservoir: Contains the water for ice making. Water Inlet Valve: Opens to allow water into the reservoir. Located on the back panel. Water Level Sensor: Controls the size of the ice cube by measuring how much water is used in a cycle.
Page 17: Autoiq Controller
Clean: The Inlet Water Valve opens to fill the reservoir. The Water Pump starts. The Clean indicator light is switched ON. A manually initiated rinse flushes the system. January 2000 Page 17 CME306 & CME456 HI VOLTAGE IN/OUT WATER PUMP PUSH BUTTON CONTROL SWITCHES INDICATOR LIGHTS:...
Page 18: How To Operate The Autoiq Controller
CME306 & CME456 How To Operate The AutoIQ Controller The AutoIQ Controller is a microprocessor based device that receives input from several sources and switches various components on and off. Its manual control is thru the use of the Push Button Control Switches 1.
Page 19: Initial Start Up
The freeze cycle will continue until the water level in the reservoir drops to its factory set point. At that time the CME306 proceeds to the harvest cycle, but the CME456 will refill the reservoir and go into harvest the NEXT time the water level drops to the set point.
Page 20: Adjustments
Water cooled models use a water regulating valve to control how much cooling water flows thru the water cooled condenser. At the top of that valve, located in the back of the ice machine, is an adjustment stem. To Adjust: 1.
Page 21: How This Machine Works
Water Inlet Valve Purge Valve Water Pump CME306 & CME456 During the Harvest cycle, water again enters the water reservoir, and a purge valve opens to drain the reservoir and dilute the concentration of accumulated minerals. The purge valve is opened...
Page 22: January
CME306 & CME456 How This Machine Works Refrigeration System The refrigeration system is similar to that of most commercial cube ice machines. Heat is removed from the water and discharged out the condenser during the freeze cycle. As liquid refrigerant...
Page 23: Technicians Only: Freeze Cycle Operational
4. Starts the fan motor (air cooled only). The Controller checks the discharge temperature and cycles the fan(s) on every 12 seconds and off for 20 seconds (CME456) or 45 seconds (CME306) if the temperature is low. If the discharge temperature exceeds the design maximum the controller shuts the unit off.
Page 24: Technicians Only: Harvest Cycle Operational
CME306 & CME456 Technicians Only: Harvest Cycle Operational Sequence Harvest The (air cooled model) fan(s) is(are) off. The purge valve opens, and will remain open for 40 seconds. The water pump shuts off, it will restart in less than 40 seconds, depending upon the Purge Level set.
Page 25: Sanitation And Cleaning
Sanitation and Cleaning It is the User’s responsibility to keep the ice machine and ice storage bin in a sanitary condition. Without human intervention, sanitation will not be maintained. Ice machines also require occasional cleaning of their water systems with a specifically designed chemical. This chemical dissolves mineral build up that forms during the ice making process.
Page 26: Additional Maintenance
Soak or scrub the distributors in or with a solution of Scotsman Ice Machine Cleaner and warm potable water. 8. Return the water distributors to their normal installed position.
Page 27: Additional Maintenance: Ice Sensors
They may be wiped clean with ice machine cleaner to assist in removal of the build up. Be sure to drain the reservoir or go thru a Clean cycle to remove residual cleaner.
Page 28 CME306 & CME456 Additional Maintenance: Water Level Sensor Water Level Sensor: Clean the lenses inside the water level sensor. 1. Remove front panel. 2. Push and hold the Off button until the ice machine stops. Float Stem Dust Cover Water Level...
Page 29: Additional Maintenance: Air Filter Replacement
3-4 seconds. Be prepared to push the Off button. If it does not, the water valve inlet or other water device is restricted. CME306 & CME456 To Check the Inlet Water Valve Screen. 1. Disconnect the electrical power.
Page 30: Additional Maintenance: Condenser
CME306 & CME456 Additional Maintenance: Condenser To Clean the Air Cooled Condenser 1. Remove the front panel. 2. Push and release the Off button. 3. Remove the top panel. 4. Remove the left side panel. 5. Check the fan blade(s) and condenser for grease or dust build up.
Page 31: Service Diagnosis: Controller Diagnostic Light
* Machine may be reset by pushing and releasing the Off button, then pushing and releasing the Freeze button. ** See following pages CME306 & CME456 Probable Correction Use some ice Check optional thermostat, check for scale on...
Page 32 CME306 & CME456 Service Diagnosis Problem or Symptom Possible Cause Unit is off because of a Ice sensors did not sense “Harvest Problem” ice falling, unit stayed in harvest until the maximum harvest time ran out. Ice sensors or Controller may have failed.
Page 33: Service Diagnosis: Components
Contactor coil open Open starting components Open windings Internal valve failure Water level too low or not sensed CME306 & CME456 Probable Correction Replace fan motor Fan motor unplugged, check for voltage from controller. If none, replace controller. Replace pump Check electrical connections.
Page 34: Service Diagnosis: Ptcr
CME306 & CME456 Service Diagnosis: PTCR The CME306 and CME456 use a PTCR (Positive Temperature Coefficient Resistor) in place of a conventional start relay and start capacitor. • Power from the contactor connects to the PTCR and to the Run Capacitor.
Page 35: Operational Characteristics: Cme306
Operational Characteristics: CME306 Cycle Times (minutes): Air Cooled Freeze Harvest Water Cooled Freeze Harvest System Pressures (PSIG): Air Cooled Suction: End of Freeze Suction: Peak in Harvest Discharge: 5 minutes into Freeze Discharge: Minimum in Harvest Water Cooled Suction: End of Freeze...
Page 36: Operational Characteristics: Cme456
CME306 & CME456 Operational Characteristics: CME456 Cycle Times (minutes): Air Cooled Freeze Harvest Water Cooled Freeze Harvest System Pressures (PSIG): Air Cooled Suction: End of Freeze Suction: Peak in Harvest Discharge: 5 minutes into Freeze Discharge: Minimum in Harvest Water Cooled...
Page 37: Removal And Replacement: Water Level Sensor
7. Compress each of the four stand-off posts to release the board from the stand-offs. 8. Remove the board from the unit. Reverse to reassemble. CME306 & CME456 Water Temperature Sensor Note: This sensor is replaced as a set with the Discharge Temperature Sensor.
Page 38: Removal And Replacement: Fan Blade And/Or Fan
CME306 & CME456 Removal and Replacement: Fan Blade and/or Fan Motor 1. Disconnect electrical power. Electrical Shock Hazard Disconnect Electrical Power Before Servicing 2. Remove front, top and left side panels. 3. Remove the fan and motor shroud assembly. A. Remove the 6 sheet metal screws holding the assembly to the condenser.
Page 39: Refrigeration
However, critical items will be noted here. Refrigerant: 1. This ice machine uses R-404A or HP62 as a refrigerant. It has several unique characteristics. A. It must use polyol ester refrigerant oil, and that oil is very water absorbent.
Page 40: Before Calling For Service
CME306 & CME456 Before Calling for Service Check the following: 1. Has the water supply to the ice machine or building been shut off? If yes, the ice machine will automatically restart within 25 minutes after water begins to flow to it.

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