CME250 - Scotsman Ice Systems
Contents
1. required to connect the electrical service a Hand Disconnect Switch o Junction Box August 1994 Page 7 CME250 After Utility Connections 1 Level the cabinet use the leg levelers on the end of the legs to adjust the cabinet height Legs should have been installed when the bin was unpacked 2 Wash out the bin If desired the interior of the bin could be sanitized Final Check List 1 Is the ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified 2 Has the water supply been connected 3 Is the water pressure adequate 4 Have the water connections been checked for water leaks 5 Have the drain connections been made 6 Have the drain connections been checked for leaks 7 Is the cabinet level 8 Is the ice machine connected to a 115 volt electrical power supply and is the ice machine the only load on that circuit 9 Has all of the shipping material been removed from the inside of the cabinet 10 Has the bin thermostat bracket been attached to the bottom of the ice machine and the capillary tube routed thru the bracket 11 Has the bin and cabinet been wiped clean and sanitized 12 Has the Customer Evaluation amp Warranty Registration form been properly filled out Check for correct model and serial numbers from the nameplate then mail the completed form to Scotsman 13 Has the owner user been given the name and telephone2. the bin using the straps and bolts shipped with the ice machine If on another brand bin follow the directions included with that bin Bin Thermostat Installation 1 Remove rubber cap from the end of the thermostat bracket 2 Attach the bin thermostat bracket to the bottom of the ice machine using the thumb screws provided There are pre drilled and tapped holes located just behind the cube drop area The end of the bin thermostat bracket with the plastic tubing on it will fit into the hole in the base of the machine 3 Locate and uncoil a portion of the bin thermostat capillary tube Route the end of the capillary tube into and through the bin thermostat bracket tube It should be inserted the full length of the tube but not past the end Stacking This machine will stack onto any CME250 CME250 CM450 CM500 CME500 CM650 or CME650 with the same cabinet depth 24 1 Remove and discard the top panel from the lower unit 2 Carefully lift the uncrated top unit onto the bottom unit Use of a mechanical lift is recommended for this step 3 Align the two ice maker cabinets 4 Secure the top unit to the bottom one with the hardware and straps shipped with the upper machine 5 Locate and uncoil all of the bin thermostat capillary tube 6 Route the bin thermostat capillary tube from the upper unit through the hole in the back of the reservoir through the lower unit and into the bin thermostat bracket Disca
3. 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 Access Valves To use the access valves Remove the cap from the stem use a 3 16 allen wrench to check that the valve is CLOSED Then remove the core cap Close the valve and replace the caps when the job is finished The valve must be closed and the caps must be on or the valve will leak Torque Stem Cap to 8 12 ft Ib Allen Wrench Torque Stem Torque Core to 6 8 ft Ib Cap to 7 12 ft Ib Access Valves Note There are no Schrader cores in the valve If the refrigeration system must be serviced the quality of service must insure that there will not be a repeat failure as repeat failures will cause refrigerant to be discharged into the air by the failure or when the failure is corrected e f there has been a compressor burn out check for acid in the oil If acid is indicated extra steps must be taken to clean up the system Never use refrigerant to clean up or flush out a refrigeration system When system clean up is required the use of suction line filter dryers and liquid line filter dryers are recommended they must be compatable with polyolester oil and HFC refrigerant Evacuate the system with a good vacuum pump to 200 microns or le
4. harvest cycle switch the master and compressor switches to OFF Replace the control box cover 3 Remove all ice from the bin 4 Remove 4 thumbscrews and the evaporator cover 5 Remove water pump discharge hose from evaporator water inlet direct hose into bin or bucket and switch the master switch ON until reservoir is empty of water Replace hose on inlet 6 Replace evaporator cover Scotsman Ice Machine Cleaner contains acids These compounds may cause burns If swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physician immediately In case of external contact flush with water KEEP OUT OF THE REACH OF CHILDREN AWARNING 7 Mix 8 ounces of Scotsman Ice Machine Cleaner with 1 gallon of warm 95 F 115 F water and pour into the reservoir until full 8 Switch the master switch ON and operate the unit for 20 minutes then switch the unit OFF 9 Repeat steps 4 and 5 10 Wash the plastic and stainless liners of the freezer section with a solution of household bleach 1 ounce of bleach to 2 gallons of water and warm 95 F 115 F water Allow to air dry 11 Pour 1 2 gallon of the solution mixed in step 10 into the reservoir Replace the evaporator cover 12 Switch the master switch back ON operate the unit for 5 minutes Switch unit OFF 13 Repeat steps 4 5 and 6 14 Pour about 1 2 gallon of clean potable water into the reservoir and switch the
5. master switch ON After 5 minutes switch the master switch OFF and repeat steps 4 5 and 6 15 Switch master and compressor switches ON 16 Replace the front panel 17 Discard the next batch of cubes to make sure all of the acid amp sanitizer is gone MAC AUTION 11 DO NOT use ice cubes produced from the cleaning or sanitizing solutions Be sure none remain in the bin MATT 18 Pour hot water into the storage bin to melt the cubes and also clean out the bin drain 19 Wash the bin liner with a solution of household bleach 1 ounce of bleach to 2 gallons of water and warm 95 F 115 F water Allow to air dry 20 The unit will now continue automatic operation Water Distributor Note The water distributor may need to be cleaned separately 1 Remove evaporator cover 2 Remove water distributor assembly by pushing the assembly to the right until the left end clears the retaining tab Removal of Water Distributor Water Distributor Retaining Tab 3 Lift up the left end of the water distributor assembly and pull the assembly to the left 4 Un snap the water distributors from the T and inspect for mineral deposits Clean as required 5 Reverse above steps to reassemble Be certain that water distributors are in place and secure Scale that may form on the plastic liner can be removed by scrubbing the surface with a mixture of Scotsman Ice Machine Cleaner and hot water Remov
6. number of the authorized Scotsman Service Agency serving that location October 1994 Page 8 CME250 Component Location gt Z SSS 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 Waiter distributor Control box with cube size control adjustment ON OFF switch Compressor switch Inside the control box is control system for the ice machine Timer Cube Size Control s i Master Switch A b lt Compressor Switch s Water PE N Distributors a Bin Thermostat i Conirol Box Bin Thermostat Drain Trough Bin Thermostat Bracket Water Pump Component Location Water Inlet Valve August 1994 Page 9 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 A change in either ambient air or incoming water temperature will affect the efficiency of the refrigeration system and this will vary the length of time it takes the evaporator to reach the temperature at which the cube size control is preset to close See CUBE SIZE ADJUSTMENT BEFORE attempting to adjust the control Relay T
7. timer micro switch button IN If the bin thermostat is OPEN the ice machine will stop If the bin thermostat is CLOSED the relay will energize and the unit will make another batch of cubes October 1994 Page 12 CME250 Maintenance and Cleanin Cleaning Schedule Scrub the outside of the cabinet once a week with soap and water Wash off the bin door frame and gaskets daily Sanitize the bin interior once a month Clean the water system and air cooled condenser a minimum of twice per year If in an area of high mineral concentration in the water supply clean water system 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 and the air cooled condenser filter and the condenser itself Inlet Water Valve Screens If a restriction of incoming water is suspected the screen on the inlet side of the water valve should be inspected amp cleaned Some models also have a strainer in the water line the strainer screen should also be inspected for restricting minerals Inlet Water Valve Inlet Screen Air Filter air cooled only 1 Remove the grill on the right side of the unit 2 Remove the filter pad from in front of the condenser 3 Wash the surface of the filter off with cold water or if torn or so dirty it can t be cleaned replace with a new filter 4
8. 32 TIA 475 66 136 156 487 68S erage hk 141 158 0 499 August 1994 Page 23 CME250 REFRIGERATION SERVICE General Scotsman recommends that any work on the refrigeration system only be done when it is certain that the system needs repair Use conservation minded service procedures Refrain from checking refrigeration pressures without reason There are many ways to determine the proper operation of a Scotsman ice machine without using refrigerant gauges Visual inspection of the water system observation of the ice formation amp draw voltage and other techniques will lead to proper diagnosis Scotsman also recommends that at the time of initial start up gauges not be used Refrigerant should not be added except as a way to determine the proper operation of the product If the system was low on refrigerant there is a leak and it must be found and repaired This system has a critical charge it must be recharged with the correct amount of refrigerant as listed on the nameplate of the ice machine or performance will suffer Anytime the refrigeration system has been opened the dryer should be replaced Note Only a HFC type dryer should be used When brazing the tubing connections to the hot gas valve or TXV the component must be protected by heat sink material Recover Recover and Reclaim or Recover and Recycle refrigerant The method chosen is up to the service company There
9. HEAT Drain tube material must be rigid and meet local code Traps in the bin drain line without vents ahead of them will cause poor draining The bin drain must be vented if there is a long horizontal run 5 or more The reservoir drain must be vented and not connected to the bin drain All drains are gravity and must have a minimum fall of 1 4 per foot of horizontal run The water cooled condenser drain is not vented and is routed separately Maintain the air gap required by local code between the end of the drain tubes and the building drain receptacle Note Drain tubing should be insulated to prevent condensation from forming on the tubing CONFORM TO ALL LOCAL CODES 1 2 FPT Outlet Water Cooled Condenser Plumbing Connections Ice Storage Bin Typical _ Water Supply and Drain Connections October 1994 Page 6 CME250 Installation For The Electrician This unit must be on a separate 115 volt AC 60 cycle single phase power supply The maximum fuse size for this circuit is listed on the nameplate and per the nameplate use fuses or HACR circuit breakers Electrical connections are made at the rear of the ice maker inside the junction box Recommendation If using wire nuts cut tinned portion of connecting wires off and strip 1 2 of insulation from the end of each wire Follow All Local Codes This Unit Must Be Grounded Usually a licensed electrician will be
10. Introduction CME250 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 The refrigeration system uses HP62 as the refrigerant HP62 models use polyolester refrigerant oil Information on HP62 is located on page 23 Table of Contents Specifications Limitations Installation Plumbing Final Check List Component Location Initial Start Up Electrical Sequence Cleaning Water Refrigeration Schematic Technical Characteristics Service Diagnosis Removal and Replacement Refrigeration Service 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 A WARNING This manual was printed on recycled paper August 1994 Page 1 CME250 Specifications Information regarding Model Number Serial Number Ampacit
11. Return the filter to its installed position 5 Replace the grill Do not operate the unit without the filter in place Note If the unit has been operated without the filter in place the fins of the condenser will become fouled with dirt and must be cleaned A vacuum cleaner with a soft brush attachment will extract most loose dust stuck to the surface of the condenser fins If there is any doubt about dirt inside the fins of the condenser the cabinet should be removed and a qualified service agent should clean the condenser Water cooled units The water cooled condenser may over time and under certain water conditions become internally restricted by minerals These will have to be dissolved by acid or the condenser replaced Only a qualified service agent should attempt this type of service August 1994 Page 13 CME250 Cleaning Ice Storage Bin The interior liner of the bin is in contact with a food product ice The storage bin must be cleaned regularly to maintain a sanitary environment Every 30 days the liner should be sanitized with a commercial ice machine sanitizer according to the directions of the sanitizer or with a solution of household bleach and water 1 Mix the bleach and water using the ratio of one ounce of bleach to two gallons of water 2 Wipe all interior surfaces of the ice storage bin with the bleach and water 3 Allow to air dry Note Always replace bin baffle if removed when cle
12. Switch Cube Size Control Timer Bin Thermostat October 1994 Page 10 CME250 Initial Start U After the final check list has been gone through the ice machine may be started up 1 Open the water shut off valve 2 Switch on the electrical power 2 Remove the front panel 4 Remove the control box cover Timer 5 Locate the timer and Control Box rotate the cam clockwise until the timer is in the Harvest Position 6 Switch the compressor switch to OFF 3 Locate the ON OFF switch switch it to ON 4 The inlet water valve will open and water will flow into the reservoir The water pump will begin to pump water over the evaporators 5 Allow the reservoir to fill 6 Switch the compressor switch to ON 7 On air cooled models the fan motor will begin to turn and warm air will be discharged from the left side of the ice machine On water cooled models warm water will begin to flow from the condenser drain Note To optimize the balance between ice production and water use the water cooled discharge pressure must be 245 P S I G Check 1 l discharge pressure and adjust water regulating valve to obtain 245 P S I G discharge pressure 8 The water temperature in the reservoir will soon be 32 F and ice should begin to form on the evaporators Note In some cases some slush will form in the reservoir This is temporary and normal Batch Weight Should Be About 2 75 to 3 Pounds Per Cyc
13. Water Distribution Hot Gas Valve System Liquid Line Evaporator z ili Condenser w J ieee ee Hot Gas Fan Motor ater TT i SEA Y Vave a COTTI TITE P wa Filter Inlet NETTEN G A a A N F E N E E N EF c af Thermo Exp Valve Water Reservoir Discharge Line Compressor Dryer Refrigeration Schematic October 1994 Page 16 CME250 Harvest Cycle During the harvest cycle the refrigerant flows from During the Harvest Cycle the inlet water valve the compressor through the discharge line toa opens filling the reservoir and allowing the branch in the line containing the Hot Gas Valve reservoir to overflow the drain This valve is Open during the harvest cycle allowing the hot discharge gas to bypass the condenser and enter the evaporator at its inlet The hot discharge gases warm up the evaporator enough to allow the surface of the ice frozen to the evaporator to melt The remaining ice will then fall off into the bin Hot Gas Valve OPEN i i Water Distribution suetoniLine System Evaporator 7 Liquid Line Condenser reer Hot Gas Fan Motor Tritiititt Valve rere tt 1 itt ti ti 24 Ga OLLIE p H Filter NETTEN CELT ti Ti ti TT ty mcr Trt AE O M M O AL G CEO Thermo Exp pu SLEEPERS Valve EE ERI y aat EREPEPLE Water Reservoir Discharge Line Compressor Dryer Refrigeration Schematic August 1994 Page 17 CME250 Technical Char
14. acteristics Typical Cycle Time 21 minutes 90 F air and 70 F water 16 minutes 70 F air and 50 F water Typical Harvest Ice Weight e 2 5 3 pounds Typical Low Side Pressure Just Before Harvest e Air cooled 35 PSIG Water cooled 28 PSIG Typical Freeze Cycle Air Cooled Discharge Pressure 220 PSIG 70 F air and 50 F water 280 PSIG 90 F air and 70 F water Refrigerant Charge Air cooled 27 ounces HP62 Water cooled 17 ounces HP62 Harvest Time Pre set at 2 and a quarter minutes Adjustable to match field requirements Typical Low Side Pressure in harvest Water cooled 86 PSIG Air cooled 100 PSIG 90 F air and 70 F water Typical Discharge pressure in harvest e Water cooled 160 PSIG Air cooled 200 PSIG 90 F air and 70 F water Hi Pressure Cut Out Point e 450 PSIG air cooled 400 PSIG water cooled Fan Pressure Switch 240 PSIG C l 190 PSIG C O Hi Temperature Cut Out Point e 140 F at hot gas valve Typical Compressor Amp Draw 10 13 during the freeze cycle and 11 14 during the harvest cycle Compressor Copeland RS43C1E CAA 213 Water Inlet Valve Flow Rate 33 g p m Cube Size Thermostat Adjustable Cut In as needed to obtain correct cube size C I range between 24 F and 0 F Bin Thermostat Adjustable C I range between 38 5 F and 43 5 F C O range between 33 5 F and 38 5 F Thermostatic Expansion Valve Not
15. adjustable October 1994 Page 18 CME250 Service Diagnosis SYMPTOM No ice is made nothing operates POSSIBLE CAUSE Unit off due to no power PROBABLE FIX Restore power Unit off due to master switch in OFF position Switch master switch to ON Unit off due to bin thermostat open Check temperature at bin thermostat bracket if warmer than 40 F thermostat should be closed Adjust replace thermostat Unit off due to hi pressure cut out open Reset and check for dirty condenser hot location or water interruption if water cooled Unit off due to hi temperature cut out open Hot gas valve leaking thru replace hot gas valve Unit off due to circuit board open Check for short circuit and replace circuit board No ice is made No water due to water turned off Reconnect water supply No water due to water filter plugged Replace water filter No water due to inlet water valve screen plugged Clean out inlet screen No water due to strainer screen Clean out inlet screen plugged No water due to Inlet water valve Replace valve coil open No water due to inlet water valve Replace valve will not open Water in reservoir but no water over evaporators Water pump does not work replace pump No cooling at evaporator due to compressor switched off Switch compressor on No cooling at evaporator due to too much heat load beca
16. aning To Remove Scale 1 Mix a cleaning solution of 4 ounces of Scotsman Ice Machine Cleaner to 4 pints of hot 95 F 110 F water 2 Using rubber gloves dip a nylon scouring pad into the cleaning solution and scrub the scale off the liner 3 After the scale has been removed rinse all surfaces inside the bin with clean potable water Stainless Steel Components Inside Bin The stainless steel parts in the bin also require periodic cleaning Chemicals in the water supply such as chlorine cause brown stains to appear on the surface of the stainless steel parts 1 General Cleaning staining is usually removed by washing the parts with ordinary cleaning powder such as Bon Ami or Copper Glo and water After cleaning rinse with clear water 2 Water treatment The chlorine enters the machine from the municipal water supply It can be removed from the water supply by using a charcoal or activated carbon water filter to treat the water to the ice machine If staining is severe filters of this type are recommended Exterior Cabinet Cleaning The exterior cabinet may be cleaned by scrubbing with soap and water Do not use cleaners containing petroleum products Anylon type brush may be used to scrub stubborn deposits October 1994 Page 14 CME250 Cleaning Ice Maker 1 Remove front panel 2 Remove control box cover and turn the timer cam clockwise until the unit is in a harvest cycle At the end of the
17. d Da an cases 31 88 194 line dryer is required see parts list OT fe oss 33 900 200 Polyolester oil absorbs water very easily and 2a Sutin 4 35 OBS oa oh Sack 206 therefore when the system is opened for Boe oe eit 37 or 212 service it must be re sealed as soon as 68 h i Se 39 96 219 possible 15 minutes maximum Sa done aks 41 ee 225 Special leak detection equipment is required to 10 oc eg ates 43 100 232 locate small refrigerant leaks Usually a leak Tee ve hs 46 102 nea ea 239 detector capable of detecting a Halogenated TAa iaia 48 o E 246 refrigerant or HFC 134a will work Check with TEE 50 106 253 the leak detector manufacturer if in doubt TB oe tetni esters 53 108 amp eee fe 260 As with any other refrigerant do NOT mix with 20 95 110 aaa 268 air for leak testing AORE RA 2 PE a ae 26 2 ga be ks 63 WAG eines tee eo 291 205 oe a 66 WIS Sy Sek eo 299 BOs sb wae 69 120 04 5 es 4 307 B2 2 oye 72 W220 2 cheek 316 OA fecha hoe 75 124 324 B6e5 3 had Sef sd 78 126 333 BO Sow Bako 81 128 342 40 85 130 351 42 88 WSZ cee es 360 44 91 134 370 46 95 1386 379 AB e pda pois 99 138 amp a aeaa 389 DO aman de bes 102 140 399 52 2 goed x ies 106 142 409 Loy eee eee 110 144 420 56 go bod 6 114 146 430 DO eet hes 118 148 2 441 S10 aigeanta 123 150 ae 452 6202 be eS 127 TIX ye a pk 464 o 1
18. e any scale prior to cleaning August 1994 Page 15 CME250 Refrigeration Schematic o gt S Freeze Cycle Water Schematic From the compressor hot discharge gas is Water flows into the ice machine from its inlet pumped to the condenser either air or water connection at the back of the cabinet through the cooled 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 From there the water flows over both sides of the evaporators and back into the reservoir Melted ice and water spills into the bin flow through a drain in the base of the bin to the exterior drain connection at the back of the cabinet At the condenser heat from the refrigerant flows into the cooling medium either air or water and the refrigerant condenses into a liquid From the condenser the liquid refrigerant flows through the liquid line to the metering device a thermostatic expansion valve At the expansion valve the liquid refrigerant passes from a high pressure zone to one of relatively low pressure and in the low pressure zone it evaporates The low pressure zone where the refrigerant evaporates is the evaporator When the refrigerant evaporates it absorbs heat from the metal parts of the evaporator and the water flowing over it From the evaporator the refrigerant flows back to the compressor through the suction line Suction Line
19. e reservoir during harvest but not during freeze The valve may plug up from minerals in the water and may be cleaned rather than replaced 1 Shut off the water supply 2 Unscrew the fitting at the back of the valve and pull the water inlet tube out of the valve body 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 Screen Must Be Kept Clean October 1994 Page 22 CME250 REFRIGERATION SYSTEM HP62 Refrigerant R 404A THIS ICE MACHINE USES HP62 REFRIGERANT Pressure Temperature Chart for HP62 AND POLYOLESTER COMPRESSOR OIL DO NOT USE MINERAL OIL IN THIS VAPOR VAPOR REFRIGERATION SYSTEM TEMP PRESSURE TEMP PRESSURE e HP62 is a Near Azeotrope and therefore DEG F PSIG DEG F PSIG liquid charging is required 20 i i oe ee Se 17 70 E ee Cee a ee 146 xA Weigh into the discharge side as much of the pe Gea 1 ee ere 120 Pos TOT 24 3202 20 re 155 Chale as 1quig aS possa E TT RD 21 TO De ohio 161 A Install a sight glass between the suction side A2 a Oe 23 1 166 and the gage manifold Use the manifold PHO wale ag hk 24 80 171 valve to flash off the balance of the l Be e Deng 26 82 177 refrigerant charge before it enters the suction a fe cam N 28 84 182 side hs oh de 29 86 ead 188 When the system is serviced a special liqui
20. es CME250WE 1E 30 x 24 x 27 Water 115 60 1 16 20 17 ounces October 1994 Page 2 For The Installer Environmental Limitations The ice machine must be installed indoors in a controlled environment Minimum Maximum Air Temp 50 F 1000F Water Temp 40 F 100 F Water Pressure 20 PSI 80 PSI Voltage 103 5 126 5 Operating the ice machine outside of the above limitations or outdoors is potentially damaging to the machine and it is misuse of the machine This may void the warranty Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance 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 Scotsman reserves the right to make design changes and or improvements at any time Specifications and design are subject to change without notice Airflow on air cooled models is ntake through the right side grill Exhaust through the left side grill Do not install where this air flow is obstructed 6 inch clearance is required at the sides and back August 1994 Page 3 CME250 CME250 Installation Water The water supply for this ice machine has been in contact with many materials since it fell from the sky as rain All rain is slightly acidic a
21. he multi function three pole double throw plug in relay is installed directly into a receptacle on the printed circuit board in the control box The relay functions in part to by pass the bin thermostat control to prevent the ice maker from shutting OFF when the bin thermostat opens during the freezing cycle The bypass action serves to ensure full sized ice cubes with each harvest cycle CONTROL BOX Relay Timer Timer amp Switch Assembly The function of the timer begins when activated by the cube size control The outer surface or large diameter lobe of the timer cam determines the timer cycle for finish freezing of the ice cubes while the inner surface or small diameter lobe determines the time cycle for the harvest cycle When the microswitch button is pushed in there is power connected to the coil of the relay and the unit is in the freeze cycle When the microswitch button is released the power to the relay is stopped and the unit goes into harvest The microswitch is actuated by a cam assembly directly connected to the timer motor One complete rotation of the cam will take eight minutes Harvest is preset at two and a quarter minutes but is adjustable High Pressure Safety Cut Out Switch This is a manual reset control that shuts down the ice maker should the discharge pressure ever reach 450 PSIG air cooled or 400 PSIG water cooled Located next to the control box High Pressure Cut Out
22. ill case a freeze up of the evaporators To Adjust Harvest Time 1 Disconnect electrical power 2 Locate time cam in control box 3 Loose set screw holding the two halves of the cam together and rotate the front half to increase or decrease the harvest portion of the cam low part 4 Re tighten the set screw 5 Reconnect power and check cube size of the next cycle as it may require adjustment after the harvest time has been set 12 Check operation of the bin control circuit by holding ice on the bin control tube in the bin This simulates bin full and the ice machine should switch itself off at the end of a harvest cycle 13 Replace all the panels The ice machine is now ready for automatic operation Electrical Sequence This describes the sequence through a complete cycle Freeze Cycle During the first part of the freeze cycle the ice machine compressor fan motor if air cooled and water pump are operating The relay in the middle of the circuit board is energized Timed Freeze Cube size control closes connecting power to the timer motor and after a few 4 5 5 5 minutes this timer opens the circuit to the relay on the circuit board This starts the harvest cycle Harvest In the harvest cycle the water pump and compressor stay operating and these two valves are energized Hot gas valve Inlet water valve The unit stays in the harvest cycle until the timer has turned the cam which has pushed the
23. le Timer Shown In Harvest Position Jo Harvest t i fa Cube Size Freeze Pa Control Knob S4 es wR Cubes Too ye Thick a Pi Bin Thermostat i m 4 114 a Correct Size amp Shape 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 10 After harvest check the ice cube size If needed adjust the cube size by rotating the adjustment knob of the cube size control Rotate it Cubes Too 1 8 turn clockwise to make the cubes thicker and Thin rotate it 1 8 turn counterclockwise to make the cubes thinner ine The machine is designed to only harvest cubes that are the correct thickness August 1994 Page 11 CME250 Initial Start U 11 Check harvest time The machine will have to harvest all of the cubes before it goes back into the freeze cycle Timer Cam Follower Timer Shown In Harvest Position Jo Harvest i in O gt Freeze J Increase the Harvest Time if there is less than 15 seconds of harvest time after the last cube has fallen into the bin Decrease the Harvest Time if there is much more than 15 seconds of harvest time after the last cube has fallen into the bin 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 w
24. nal room cooling Compressor inefficient Check replace compressor Cubes are wrong size shape Cube size control not adjusted properly Adjust cube size control Water system is restricted with minerals Clean water system with Scotsman Ice Machine Cleaner Not enough water Check water supply pressure Check water supply for restrictions Ice fused together in bin Ice in bin too long Advise user to pour water on ice to ease removal Too many minerals in water Suggest water treatment to user Water drips on ice Water distributors loose Set water distributors in place on top of evaporator Some water is normal Advise user Cube size too small Adjust thicker Water system is dirty Clean water system with ice machine cleaner October 1994 Page 20 CME250 Removal and Replacement Cube Size Control Before replacing the cube size control it should be positively determined that it is at fault If it does not open when warm replace it 1 Disconnect electrical power AWARNING Electrical shock hazard Electrical shock can cause personal injury Disconnect power before beginning to service components Cube Size Pig Tail Socket 2 Remove the front panel 3 Remove the control box cover 4 Locate the cube size control 5 Remove the two screws holding the control to the control box and lift the con
25. nd tends to dissolve the materials it comes in contact with During water s journey to the ice machine it has flowed over and through the ground been picked up by a municipal or private pump forced through a series of pipes of differing construction and may have been treated by the municipality providing the water The water supplied to this ice machine will then contain a variety of substances that will likely show up as solids during the ice making process These solids are similar to those found when water is boiled out of a saucepan Only the water boils away and the minerals that were in the water solidify in the pan During ice making only the water is frozen into ice the minerals stay behind in the reservoir This machine pumps out the water in the reservoir every cycle to minimize the amount of minerals in the water system but after time the minerals will appear and have to be dissolved by ice machine cleaner then flushed away during the cleaning process An ice machine is a food manufacturing plant it takes a raw material in this case water and transforms it into a food product ice The purity of the water is very important in obtaining pure ice and in maximizing product life The water to the ice machine should be filtered Water filters vary greatly in ability and function Install one that filters out suspended solids to a dimension of 5 microns or less The finer the filter the better but finer filters may plug u
26. p sooner than course ones It may be necessary to add a course filter ahead of the fine filter to prolong filter life Have the water tested Acidic water or alkaline waiter will both cause corrosion Dissolved solids cannot be filtered out Check with a water treatment specialist regarding testing treatment and filters Air cooled models blow air in and out through the grills at the sides in the right and out the left Space is required for air flow at the sides and utility connections at the back The ice machine is not designed for outdoor use It must be installed indoors ina 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 No extension cords are allowed The building drain inlet must be lower than the drain outlet of the ice bin The water supply must have a hand shut off valve accessible when the unit is installed October 1994 Page 4 CME250 Installation Assembly 1 Attach the legs or optional casters onto the ice storage bin Units that are stacked should only use legs not casters 2 Place the ice machine onto the storage bin 3 Line up the ice machine check that there is a good seal between the ice machine and the storage bin 4 If on a Scotsman bin attach the ice machine to
27. rd upper unit bracket August 1994 Page 5 Bin Thermostat Installation Thermostat Capillary Tube Bin Thermostat Bracket Stackin l Le g Reservoir CME250 Installation For The Plumber 1 Connect cold potable water to the 3 8 male flare at the back of the cabinet A water filter is recommended Flush the water line prior to connecting to the ice machine If water cooled connect a separate water inlet line to the water cooled condenser inlet fitting It should also have a hand shut off valve 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 listed product the tube from the inlet water valve has an air break in it is above the reservoir wall and cannot siphon 2 Connect a drain tube to each drain The drain tubes from these connections must be run separately There are two connections one is the bin drain and the other is the reservoir drain The reservoir drain is a 3 4 F P T brass fitting 3 8 Male Flare Water Inlet Water Shut Off Valve az Reservoir Drain 3 4 FPT Must Be Vented Bin Drain May Be Routed From The Bottom On Some Model Bins Fitting May Be Plastic DO NOT OVER
28. ss If the triple evacuation method is used the vacuum should be broken each time with dry nitrogen not refrigerant Evacuation must be from both sides of the system If an ice machine is to be discarded and still contains refrigerant Scotsman recommends that the refrigerant be recovered reclaimed or recycled so that it is not discharged into the air October 1994 Page 24
29. trol out 6 Pull the two wires off the posts of the cube size control 7 Follow the capillary tube of the cube size control Replacement of Cube Size and remove it from the grommet in the back of the control box 8 Locate bulb on suction line 9 The end of the cube size control is inserted in a socket attached to the suction line Pull it out of the socket 10 Replace the cube size control with the proper part number following the above steps from 9 1 August 1994 Page 21 CME250 Removal and Replacement Water Pump The pump provides the force to move the water from the reservoir to the freezing surface The pump does not need oil but if it becomes noisy overheats or will not pump it should be replaced Be certain to confirm electrical faults with a voltmeter or ohmmeter before replacing the pump The pump should be operating whenever the compressor is 1 Unplug or disconnect the electrical power AWARNING Electrical shock hazard Electrical shock can cause personal injury Disconnect power before beginning to service components 2 Unplug the pump from its connection 3 Loosen the two fasteners holding the bracket to the wall 4 Pull discharge hose from pump discharge port Replacement of Water j 5 Pump ey 5 Remove pump from ice machine 6 Remove bracket from pump 7 Reverse above steps to replace Inlet Water Valve Inlet Water Valve The valve water to enter th
30. use inlet water valve leaks thru Replace inlet water valve No cooling at evaporator due to hot gas valve leaking thru Replace hot gas valve No cooling at evaporator due to fan not turning Check amp replace fan motor or fan control switch No cooling at evaporator due to dirty condenser Clean condenser August 1994 Page 19 CME250 Service Diagnosis SYMPTOM No ice is made POSSIBLE CAUSE No cooling due to low refrigerant charge PROBABLE FIX Locate leak recover remaining refrigerant replace dryer evacuate and weigh in nameplate charge Will not harvest due to hot gas valve not opening Check for voltage to coil in harvest if there is voltage check coil if coil is ok replace hot gas valve No cooling due to compressor not operating Check compressor for voltage continuity and operation Replace if found to be faulty Will not harvest due to not enough harvest time Adjust harvest time longer Will not harvest due to lack of water Check water supply amp distribution system Clean water system with Scotsman Ice Machine Cleaner Makes ice but very little High discharge pressure due to dirty condenser faulty fan motor fan pressure switch not enough water thru water cooled condenser Check for causes of high discharge pressure and correct Inlet water temperatures and room ambient very high Advise user suggest additio
31. y and Maximum Fuse Size are located on the nameplate of the ice machine The model number serial number and refrigerant charge are also listed on the serial number plate enti just behind the front win Ane panel cee If recharging always use the charge listed on the ice machine REFRIGERANT MOTORS cor us VOLTS RLAIFLA WHP LRA Nameplate Serial Number Plate i 18 2 CW MIN UTILITY CONNECTION 6 00 IN MIN AIR VENTILATION PLAN VIEW MIN AIR VENTILATION 1398 m CUBE OPENING 6 00 IN 15 2 CM 15 2 CM 6 00 IN The CME250 will stack ontonnewadeb of erotsman F ice storage bins 2 88 IN PUR 12 84 IN 3 00 IN BH550 sacom e HTB500 HTB350 HTB250 13 54 IN BH800 with bin top KBT23 BH900 with bin top KBT22 ELECTRICAL INLET BH1360 eer re Cae It will also fit these Scotsman Dispensers en seme CD200 aamin 1S150 with KADCM1 lt a a RS150 with KADCM1 These smaller bins are recommended CONDENSER DRAIN WATER COOLED ONLY 12 84 IN There is an optional stainless steel panel kit ee wise SPKCMD 1 for this machine BACK view N Specifications Model Number Dimensions Condenser Basic Minimum Maximum Fuse Refrigerant W x D x H Type Electrical Circuit Size or HACR Charge HP62 Ampacity circuit breakers CME250AE 1E 30 x 24 x 27 Air 115 60 1 16 20 27 ounc
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