Scotsman CME256 Product Manual Download

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Introduction:

This product manual contains the information
needed for the setup, installation, initial start up,
sanitation and maintenance of this ice machine.
Keep it for future reference.

All series of these 4 models are covered in this
manual:

•

CME256, a 115 volt, single evaporator
machine

•

CME506, a 115 volt, dual evaporator
machine (115 volt if 60 Hz, 230 volt if 50 Hz)

•

CME656 and CME806, 230 volt, dual
evaporator machines

Be certain that the information applies to the model
in question. If no model is listed, the information
applies to all models, including A through F series.

This manual is organized in the same way as the
expected use of the machine, it begins with
specifications, goes thru unpacking and setup,
shows where everything is; continues with initial
start up, then describes how it works. After that is
the sanitation section, followed by service
diagnosis and repair.

CME256, 506, 656, 806: AutoIQ™ Cubers

June 2002

Page 1

Printed on Recycled Paper.

Parts lists are in the center section.

Table of Contents

Specifications:

. . . . . . . . . . . . . . . . page 2

Pre-Installation . . . . . . . . . . . . . . . . page 3

Location & Assembly: . . . . . . . . . . . . . page 4

Stacking: . . . . . . . . . . . . . . . . . . . page 5

Plumbing: . . . . . . . . . . . . . . . . . . . page 6

Electrical: . . . . . . . . . . . . . . . . . . . page 7

After Utility Connections: . . . . . . . . . . . page 8

Component Location and Function: . . . . . . page 9

AutoIQ Controller: . . . . . . . . . . . . . . . page 10

Initial Start Up:

. . . . . . . . . . . . . . . . page 11

Adjustments: . . . . . . . . . . . . . . . . . page 12

Adjustments: . . . . . . . . . . . . . . . . . page 13

How To Operate The AutoIQ Controller

. . . page 14

How The Electronic Cuber Works

. . . . . . page 15

Technicians Only: Freeze Cycle Operational Sequence

. . . . . . . . . . . . . . . . . . . . . . . . . page 16

Technicians Only: Harvest Cycle Operational Sequence

. . . . . . . . . . . . . . . . . . . . . . . . . page 17

Sanitation and Cleaning

. . . . . . . . . . . page 18

Additional Maintenance . . . . . . . . . . . . page 19

Additional Maintenance: Water Distributors

. page 20

Additional Maintenance: Inlet Water Valve Screen

. . . . . . . . . . . . . . . . . . . . . . . . . page 21

Additional Maintenance: Bin Controls, Condenser

. . . . . . . . . . . . . . . . . . . . . . . . . page 22

Service Diagnosis: Controller Diagnostic Light Analysis

. . . . . . . . . . . . . . . . . . . . . . . . . page 23

Service Diagnosis . . . . . . . . . . . . . . . page 24

Service Diagnosis: Components . . . . . . . page 25

PTCR Diagnosis

. . . . . . . . . . . . . . . page 26

Operational Characteristics:

CME256

. . . . page 27

Operational Characteristics:

CME506

. . . . page 28

Operational Characteristics:

CME656

. . . . page 29

Operational Characteristics:

CME806

. . . . page 30

Removal and Replacement . . . . . . . . . . page 31

Removal and Replacement . . . . . . . . . . page 32

Removal and Replacement: Sensors . . . . . page 33

Removal and Replacement: Fan Blade and/or Fan
Motor . . . . . . . . . . . . . . . . . . . . . page 34

Access Valves: . . . . . . . . . . . . . . . . page 35

Before Calling for Service . . . . . . . . . . . page 36

Summary of Contents for CME256

Page 1: ...e Installation page 3 Location Assembly page 4 Stacking page 5 Plumbing page 6 Electrical page 7 After Utility Connections page 8 Component Location and Function page 9 AutoIQ Controller page 10 Initial Start Up page 11 Adjustments page 12 Adjustments page 13 How To Operate The AutoIQ Controller page 14 How The Electronic Cuber Works page 15 Technicians Only Freeze Cycle Operational Sequence page ...

Page 2: ...ds A thermostat kit is available to lower the ice level its part number is A37749 001 A stacking kit for like models is KSCME6 30 Scotsman reserves the right to make design changes and or improvements at any time Specifications and designs are subject to change without notice Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in...

Page 3: ...ombined with water filters prolongs the times between needed water system cleaning Note All Scotsman CM3 models like those described in this manual feature Scotsman s AutoIQ control system and ReliaClean water system cleaning process Service Technicians All models are set by the factory at a standard water rinse which is compatible with typical water conditions The ReliaClean water system provides...

Page 4: ... sealant prior to placing the ice machine on the bin If the ice machine has not been unpacked do so now Remove the carton from the skid Lift the ice machine off the skid directly onto the bin Note The machine is heavy Use a mechanical hoist if necessary Secure the ice machine to the bin with the hardware provided two metal straps and 4 bolts Cabinet Panel Removal Note The top panel holds the upper...

Page 5: ...liefs over the wrapped portion of the stacking kit wire harness Route the Stacking Kit Wire Harness from the back to the top and bottom machines thru the holes made in step 5 The harness is marked which end goes to which machine Push the strain reliefs into place from the back of the machines Follow local electrical codes for 24 volt wire In the lower unit route the wire behind the suction line an...

Page 6: ...he cabinet Water cooled models have an additional condenser drain it is a FPT fitting at the back of the cabinet Do not vent this drain The ice storage bin will have a drain out the back or base depending upon the model Note Scotsman HTB555 shown in this manual may be drained either out the back or the base Insulation is recommended for the ice machine reservoir and bin drains Follow all applicabl...

Page 7: ...pe circuit breakers may be used Electrical connections are made in the junction box in the back of the cabinet 1 Remove the junction box cover 2 Knock out 1 hole for a field supplied strain relief 3 Install wires and strain relief per code 4 Connect to wires and secure ground wire to ground screw inside junction box Follow all Local State and National codes CME256 506 656 806 AutoIQ Cubers January...

Page 8: ...ted where it can receive adequate cooling air 3 Has the correct electrical power been supplied to the machine 4 Have all the water supply connections been made 5 Have all the drain connections been made 6 Has the unit been leveled The unit must be leveled at the water reservoir 7 Have all unpacking materials been removed 8 Is the water pressure adequate 9 Have the drain connections been checked fo...

Page 9: ...ng compartment is fully insulated for maximum efficiency Cube Deflector The slots in the inclined deflector let the water falling from the evaporators back into the reservoir but when ice falls during harvest the ice slides off into the bin Refrigeration Service Access Valves Only to be used by a certified technician Allows access to the refrigeration system for diagnostic information Water Pump F...

Page 10: ...if air cooled and water pump are ON Harvest The refrigeration and water systems are operating to harvest the ice cubes While the compressor is on for the full cycle the water pump will be off at the beginning and inlet water valve will switch off before the end Clean The Inlet Water Valve opens to fill the reservoir The Water Pump starts The Clean indicator light is switched ON A manually initiate...

Page 11: ...ill the reservoir and overflow it for a specified number of seconds then shut off The harvest cycle may still be in progress The Bin Full indicator light will go on and off as ice falls from the evaporators 6 Machines are shipped from the factory with the purge level set to accommodate average water conditions See page 13 for purge adjustment instructions 24 hours of run time may be need to attain...

Page 12: ...d restart the machine by pushing and releasing the Off push button switch and then pushing and releasing the freeze push button switch How to Adjust Cube Size Reference Only The adjustment is done by moving the long screw located in the floating stem at the front of the machine Note Units manufactured beginning 3 97 do not have a cube size adjustment screw their cube size is fixed 1 Remove the fro...

Page 13: ...FF button for more than 3 seconds just until all lights flash on then release it Do not hold it in it too long 3 Examine the green lights They should have all flashed once then certain ones will have turned on to indicate which purge level the machine is set at There are 5 levels of purge available 1 Maximum Purge is when All 5 lights are ON Use for extreme water conditions Note This setting may e...

Page 14: ...he dissolved scale and ice machine cleaner 4 Off Button Pushing and releasing this button will switch the machine OFF at the end of the next cycle If the button is pushed and HELD for more than 3 seconds the unit will switch off immediately To Reset Machine machine off error light on First push and release the Off button then push and release the Freeze button To Recall the last two diagnostic cod...

Page 15: ... overflow for a fixed amount of time but for a time determined by the Controller The water pump will be off for a short period of time at the beginning of harvest 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 passes thru the Thermosta...

Page 16: ...t does not it is assumed that there is a water pump problem and the machine Shuts Down on a Water Error If the water level does measure up the water pump is restarted and the controller then measures how long it takes to lower the water level If the water level does not fall the machine Shuts Down on a Water Error 6 Once per cycle the machine may shut off the water pump It only does this when the ...

Page 17: ... Shuts Down Note Machines built up to August 1996 The last Harvest cycle before shutting off on Bin Full will be 10 minutes long Machines built beginning August 1996 have a last harvest cycle that is 4 6 minutes long Note The machine will not restart for 4 minutes after switching off on Bin Full unless the freeze button is pressed Stacked Units If the bottom unit is in harvest and receives a signa...

Page 18: ...r 9 After the ice machine cleaner has circulated for 10 minutes push and release the Clean button This starts the rinsing process The Clean indicator light will be ON Note The rinse process flushes any residual cleaner out of the ice machine s water system 10 Continue the rinsing process for 20 minutes then push the off button to switch the machine off 11 Go to the next step to sanitize the machin...

Page 19: ...nd properly seated There is a key tab and slot that positions the standpipe in the drain socket 10 Push and release Freeze button 11 Replace front panel To Sanitize the Ice Storage Bin 1 Remove all ice 2 Remove baffle 3 Switch ice machine OFF or wait for it to be in a cleaning cycle 4 Mix a 1 gallon solution of warm 95 115oF water and sanitizer Follow local codes for sanitizer 5 Wash or spray the ...

Page 20: ...ributors Although they are made of a material that is resistant to mineral build up some may be present Soak or scrub the distributors in or with a solution of Scotsman Ice Machine Cleaner and warm potable water 9 Return the water distributors to their normal installed position 9a Snap the two distributors onto the water manifold Place them on the back evaporator right end first Push the distribut...

Page 21: ...he water valve inlet or other water device is restricted To Check the Inlet Water Valve Screen 1 Disconnect the electrical power 2 Shut off the water supply 3 Remove the front panel 4 Unplug the electrical connection of the inlet water valve 5 Remove the screws holding the inlet water valve to the cabinet 6 Remove outlet tube from inlet water valve 7 Rotate inlet water valve from inlet fitting and...

Page 22: ...asive materials or cleaner on the bin sensor lenses A soft toothbrush is an effective tool for cleaning these sensors Air Filter Replacement See Page 30 for an illustration of Air Filter Replacement 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 right and left side panels 5 Clean or replace the air filters 6 Check th...

Page 23: ...ion diagnostic light is ON or BLINKING Low discharge or long freeze cycle If the Refrigeration light is glowing steadily there is a probable refrigeration problem Harvest problem If the Refrigeration light blinks once and repeats look for a harvest problem On controllers 17 1 and higher this also indicates that cubes were sensed by the bin controls Hot Gas Valve failure Check hot gas valve operati...

Page 24: ... bulbs to correct suction lines CME506 E series one TXV not metering Check TXV replace if there is poor ice formation on its plate Low ice capacity Dirty condenser or filter Replace filters clean condenser Recirculation of air Block air re circulation or move condenser Low refrigerant charge Check system If there is a low charge find the leak recover the refrigerant repair the leak replace the dry...

Page 25: ...Replace hot gas valve No power to coil in Harvest Check wire connections if ok replace System Controller Hot Gas Valve leaks thru warm tube temperatures on both sides of valve during freeze Mechanical problem in valve Replace valve Water Inlet Valve does not open Open solenoid coil Replace valve Stuck valve Replace valve No power to valve early part of harvest Check wire connections if ok replace ...

Page 26: ...s temperature changes When the PTCR is cold it connects full current to the compressor s start winding After a very short time the PTCR heats up and shuts off the current flow Under normal operation the PTCR s case is at about 180o F At that temperature the PTCR has very high resistance and will not allow current flow It must cool down to 120o F before current will pass through it again Diagnosis ...

Page 27: ...6 AutoIQ Cubers July 2002 Page 27 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 15 17 17 19 Harvest 1 5 2 1 30 2 Water Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 13 15 17 19 Harvest 1 30 2 1 45 2 15 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Suction End of Freeze 25 27 28 30 Suction Peak in Harvest 95 105 95 110 D...

Page 28: ...G Cut Out 190 PSIG 10 PSIG CME256 506 656 806 AutoIQ Cubers July 2002 Page 28 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 18 20 22 24 Harvest 2 1 30 Water Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 20 22 22 24 Harvest 1 5 2 5 1 5 2 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Suction End of Freeze 35 37 35 37 Suct...

Page 29: ...IQ Cubers January 2002 Page 29 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 14 15 15 16 Harvest 1 30 1 30 Water Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 15 16 16 17 Harvest 3 2 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Suction End of Freeze 25 27 24 26 Suction Peak in Harvest 83 87 84 88 Discharge 5 minutes in...

Page 30: ...equipped Cut In 240 PSIG 20 PSIG Cut Out 190 PSIG 10 PSIG Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 9 11 12 14 Harvest 1 45 1 15 Water Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Freeze 10 12 12 13 Harvest 1 45 1 15 Air Cooled 70o F indoor air 50o F water 90o F indoor air 70o F water Suction End of Freeze 20 21 25 27 Suction Peak in Harvest 89...

Page 31: ...d release the Off button 3 Remove side panel retaining screws 2 for each panel 4 Lift up or remove top panel 5 Pull left panel to the left and remove filter 6 Pull right side panel forward and remove the air filter 7 Replace the air filters Note Filter size is 20 x 20 x 1 Use a like replacement equal to UL class 2 377A 8 Check the fan blade and condenser for grease or dust build up Clean as requir...

Page 32: ... the top edge of the standpipe and the top edge of the reservoir must be 2 5 8 If needed adjust the distance by rotating the top end of the standpipe it is threaded Observe machine for proper cube size after replacement adjustment of the standpipe Water Pump 1 Disconnect the electrical power 2 Remove the front panel 3 Unplug water pump from its electrical connection 4 Remove 1 plastic bolt and the...

Page 33: ... two screws holding the sensor to the pump bracket and lift the sensor up and out of the machine 6 Reverse to reassemble Float Stem 1 Remove the front panel 2 Remove the reservoir cover 3 Pull up on float stem reach under pump cover and pull the float off the stem 4 Pull stem out and reverse to replace Note Replacement float stems are factory set but confirm the settings before installing the new ...

Page 34: ...r Note The contactor coil is 24 volt Note If the transformer is not supplying power check the system controller for blacking at the top connections If the connections appear to have blacked replace the system controller before the transformer is replaced Discharge Line Temperature Sensor 1 Remove front panel push and release the Off button 2 Remove top and left side panels 3 Locate discharge line ...

Page 35: ...open for more than 15 minutes B An electronic leak detector capable of locating HFC 134a type refrigerant must be used to locate refrigerant leaks C A nitrogen sweep is required when brazing D An HFC type liquid line dryer must be used E When evacuating use of an electronic micron gage is recommended Evacuate to 300 microns F It must be liquid charged 1 Place a drum or cylinder of R 404A on a scal...

Page 36: ...t panel 2 Locate the AutoIQ Controller If a red diagnostic light is glowing note which one and its blink rate Then push and release the off button 3 Push and release the Freeze button 4 The machine should begin to operate If there is a lack of water it will shut off again soon 5 Return the front panel to its normal position If the machine shuts down again call for service To Shut the Machine Off 1...

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