Manitowoc RNS012 Technician'S Handbook Download Page 94

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Part Number STH044 10/13

LOW PRESSURE CUTOUT (LPCO) CONTROL

FUNCTION

Stops the ice machine if the low side pressure is too
low. The LPCO control is closed at pressures above
setpoint and opens at pressures below setpoint.

CHECK PROCEDURE

1. Connect manifold gauge set to suction access

valve.

2. Disconnect wires from low pressure switch and

connect ohm meter across LPCO terminals.

Replace the LPCO control if it:

1. Is not closed at the specified setpoint.

2. Does not open at the specified setpoint.

Specifications

Cut-Out

Cut-In

Current Production &

Replacement Part

17 psig ±5

35 psig ±7

Summary of Contents for RNS012

Page 1: ...is manual is updated as new information and models are released Visit our website for the latest manual www manitowocice com America s 1 Selling Ice Machine RNS012 RNS020 Nugget Ice Machines Part Number STH044 10 13 Manitowoc ...

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Page 3: ...st you as you work Throughout this handbook you will see the following types of procedural notices Warning Text in a Warning box alerts you to a potential personal injury situation Be sure to read the Warning statement before proceeding and work carefully Caution Text in a Caution box alerts you to a situation in which you could damage the equipment Be sure to read the Caution statement before pro...

Page 4: ...g com for manual updates translations or contact information for service agents in your area If you encounter problems not covered by this manual do not proceed contact Manitowoc Foodservice Group We will be happy to provide assistance Important Routine adjustments and maintenance procedures outlined in this handbook are not covered by the warranty Warning PERSONAL INJURY POTENTIAL Do not operate ...

Page 5: ...ce are required to lift this appliance Warning This equipment contains high voltage electricity and refrigerant charge Installation and repairs are to be performed by properly trained technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure The technician must also be certified in proper refrigerant handling and servicing procedures All lockout and t...

Page 6: ...rience and knowledge unless they have been given supervision concerning use of the appliance by a person responsible for their safety Do not allow children to play with this appliance Warning All covers and access panels must be in place and properly secured before operating this equipment Warning Do not obstruct machine vents or openings Warning Do not store gasoline or other flammable vapors or ...

Page 7: ...ving parts d Only use attachments recommended or sold by the manufacturer e Do not use outdoors f For a cord connected appliance the following must be included Do not unplug by pulling on cord To unplug grasp the plug not the cord Unplug from outlet when not in use and before servicing or cleaning Do not operate any appliance with a damaged cord or plug or after the appliance malfunctions or is dr...

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Page 9: ...tion Location of Ice Machine 13 Ice Machine Clearance Requirements 14 Ice Machine Heat of Rejection 14 Electrical Service 15 Circuit Ampacity 15 Ice Machine Head Section Water Supply and Drains 16 Potable Water Supply 16 Potable Water Inlet Lines 16 Drain Connections 17 Operation Ice Making Sequence of Operation 19 RNS012 RNS020 Nugget Machines 19 Touch Pad Sequence of Operation 21 Sequence of Ope...

Page 10: ...General Information 36 Water Dump Valve 50 Cleaning the Condenser 52 Removal from Service Winterization 53 General 53 Troubleshooting SafeGuard Feature 55 SafeGuards 57 No Water 57 No Ice Production 58 Ice Machine Will Not Run Diagnostics 60 Refrigeration Diagnostics 66 Before Beginning Service 66 Installation Visual Inspection Checklist 66 Water System Checklist 67 Ice Production Quality Check 68...

Page 11: ... Dispense Switch 82 Touchless Sensor 83 High Pressure Cutout Control 84 Fan Cycle Control 85 Low Pressure Cutout LPCO Control 86 Compressor Electrical Diagnostics 87 Diagnosing Start Components 89 Refrigerant Recovery Evacuation 91 Normal Self Contained Procedures 91 System Contamination Clean Up 95 Determining Severity Of Contamination 95 Cleanup Procedure 97 Replacing Pressure Controls Without R...

Page 12: ...l 103 Filter Driers 103 Total System Refrigerant Charge 104 Charts Cycle Times 24 Hour Ice Production Refrigerant Pressure Charts 105 RNS012A RNS020A 106 Diagrams Wiring Diagrams 107 RNS012 RNS020 115 60 1 230 50 1 108 Electronic Control Board 109 RNS012 RNS020 Control Board 109 Refrigeration Tubing Schematic 111 RNS012 RNS020 111 ...

Page 13: ...re listed on the OWNER WARRANTY REGISTRATION CARD They are also listed on the MODEL SERIAL NUMBER DECAL affixed to the ice machine MANITOWOC CLEANER AND SANITIZER Manitowoc Ice Machine Cleaner and Sanitizer are available in 16 oz 473 ml bottles These are the only cleaners and sanitizer approved for use with Manitowoc products Caution Nugget models must use cleaner part number 000000084 ONLY clear ...

Page 14: ...cts in material or workmanship under normal and proper use and maintenance as specified by the COMPANY and upon proper installation and start up in accordance with the instruction manual supplied with the ice machine The COMPANY S warranty hereunder with respect to the compressor shall apply for an additional thirty six months excluding all labor charges The obligation of the COMPANY under this wa...

Page 15: ...een subjected to misuse abuse neglect or accidents 3 any ice machine that has been installed and or maintained inconsistent with the technical instructions provided by the COMPANY or 4 any ice machine initially installed more than five years from the serial number production date This warranty shall not apply if the Ice Machine s refrigeration system is modified with a condenser heat reclaim devic...

Page 16: ...leted and sent to the COMPANY within five 5 days from the installation date Complete the following and retain for your record Distributor Dealer Model Number Serial Number Installation Date MANITOWOC ICE 2110 So 26th St P O Box 1720 Manitowoc WI 54220 Telephone 920 682 0161 Fax 920 683 7585 Web Site www manitowocice com ...

Page 17: ...defects in material or workmanship for the warranty period outlined below under normal use and maintenance and upon proper installation and start up in accordance with the instruction manual supplied with the Product HOW LONG DOES THIS LIMITED WARRANTY LAST WHO IS COVERED BY THIS LIMITED WARRANTY This limited warranty only applies to the original consumer of the Product and is not transferable Pro...

Page 18: ...e balance of the original warranty period whichever is longer The foregoing constitutes Manitowoc s sole obligation and the consumer s exclusive remedy for any breach of this limited warranty Manitowoc s liability under this limited warranty is limited to the purchase price of Product Additional expenses including without limitation service travel time overtime or premium labor charges accessing o...

Page 19: ...talled and or maintained in accordance with the instruction manual or technical instructions provided by Manitowoc To the extent that warranty exclusions are not permitted under some state laws these exclusions may not apply to you EXCEPT AS STATED IN THE FOLLOWING SENTENCE THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY OF MANITOWOC WITH REGARD TO THE PRODUCT ALL IMPLIED WARRANTIES ARE S...

Page 20: ...TRACT TORT OR ANY OTHER THEORY OF LIABILITY Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you HOW STATE LAW APPLIES This limited warranty gives you specific legal rights and you may also have rights that vary from state to state or from one jurisdiction to another REGISTRATION CARD To secure prompt ...

Page 21: ...generating equipment or in direct sunlight The location must be capable of supporting the weight of the ice machine and a full bin of ice The location must allow enough clearance for water drain and electrical connections in the rear of the ice machine The location must not obstruct airflow through or around the ice machine Refer to the chart below for clearance requirements The ice machine must b...

Page 22: ... ice machine when sizing air conditioning equipment where self contained air cooled ice machines are installed RNS012 RNS020 Self Contained Air Cooled Top 24 61 0 cm Sides 8 20 3 cm Back 5 12 7 cm RNS012 RNS020 airflow is in the left side and out the top Series Ice Machine Heat of Rejection Air Conditioning RNS012 RNS020 2 300 BTU Hour Because the heat of rejection varies during the ice making cyc...

Page 23: ...e minimum circuit ampacity is used to help select the wire size of the electrical supply Minimum circuit ampacity is not the ice machine s running amp load The wire size or gauge is also dependent upon location materials used length of run etc so it must be determined by a qualified electrician Warning All wiring must conform to local state and national codes Warning The ice machine must be ground...

Page 24: ...e machine to a hot water supply Be sure all hot water restrictors installed for other equipment are working Check valves on sink faucets dishwashers etc If water pressure exceeds the maximum recommended pressure of 80 psig 5 5 Bar obtain a water pressure regulator from your Manitowoc Distributor Install a water shut off valve and union for both the ice making and condenser water lines Insulate wat...

Page 25: ...2 5 cm per meter and must not create traps The floor drain must be large enough to accommodate drainage from all drains Run separate bin and water cooled condenser drain lines Insulate them to prevent condensation Vent the bin drain to the atmosphere Do not vent the condenser drain on water cooled models Drains must have a union or other suitable means to allow a place of disconnection from the ic...

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Page 27: ...ter sensing switch must be closed water reservoir full of water and water sensing float in the up position INITIAL STARTUP A 15 minute delay period must expire The delay period starts to time out upon application of power and can not be overridden When the five minute delay period expires the gear motor energizes The water in the reservoir closes the water sensing float switch and the compressor a...

Page 28: ...e delay period expires the gear motor compressor and condenser fan motor energize 2 The ice machine was off for more than 30 minutes The gear motor and dump valve energize to drain the water from the evaporator and reservoir After 30 seconds the dump valve de energizes When the reservoir fills with water the water sensing switch closes and the compressor and condenser fan motor energize CHANGING T...

Page 29: ... Ice Machines will energize and flash after 10 000 hours of run time The ice machine will need to be serviced to ensure future reliability SAFEGUARDS The ice machine control board has safety features to protect the ice machine from severe failures The ice machine will stop when conditions arise that would cause major component failure Refer to Safeguards for details TOUCH PAD SEQUENCE OF OPERATION...

Page 30: ...Coil Dump Valve Gear Motor Ice Damper Duration Initial Start Up The 15 minute delay must expire first Off Off On Closed Immediate Freeze Cycle On Off On Moves to Verify Ice Production Until Ice Holds Damper Open Automatic Shut Off Off Off Off Open Until Damper Closes ...

Page 31: ...e water level is factory set and normally will not require adjustment The water level is correct if the Water Level indicator light is energized and no water is entering the overflow tube The float valve is secured with 2 stop nuts If an adjustment is required raise or lower the stop nuts as needed ...

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Page 33: ...is a violation of Federal law to use these solutions in a manner inconsistent with their labeling Read and understand all labels printed on bottles before use Caution Do not mix Cleaner and Sanitizer solutions together It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling Warning Wear rubber gloves and safety goggles and or face shield when handling i...

Page 34: ...ak efficiency and lower operating costs This technology allows initiation and completion of a clean cycle after which the ice machine automatically starts ice making again There are three separate cleaning procedures Heavily Scaled Cleaning Procedure Perform this procedure if you have some or all of these symptoms Grinding popping or squealing noises from the evaporator Grinding noise from gearbox...

Page 35: ...with stainless steel products Sponge any dust and dirt off the outside of the ice machine with mild soap and water Wipe dry with a clean soft cloth Heavy stains should be removed with stainless steel wool Never use plain steel wool or abrasive pads They will scratch the panels WEEKLY Remove grill from scrap ice tray and wipe splash panel scrap ice tray and grill with sanitizer water solution Pour ...

Page 36: ...he toggle switch to the CLEAN position Water will flow through the water dump valve and down the drain Step 2 Remove the cover from the top of the ice chute Wait about one minute then add the proper amount of Manitowoc Ice Machine Cleaner and re install cover Caution Use only Manitowoc approved Ice Machine Cleaner part number 000000084 It is a violation of Federal law to use these solutions in a m...

Page 37: ...eaning must be performed on adjacent surface areas not contacted by the water distribution system NOTE The ice machine may be set to start and finish a cleaning procedure and then automatically start ice making again A After cleaner is added move the switch from CLEAN to ICE position B When the cleaning cycle is complete ice making will start automatically ICE WATER ICE WATER ADD SOLUTION HERE ...

Page 38: ...determine the next cycle after the Clean cycle is completed CLEAN POSITION The ice machine will wait for a change in toggle switch position OFF POSITION The ice machine will wait for a change in toggle switch position ICE POSITION The ice machine will start making ice automatically 3 To abort the clean cycle move the toggle switch from CLEAN to OFF to CLEAN and back to OFF within a 15 second time ...

Page 39: ...gle switch to the OFF position Step 2 Remove all ice from the bin Step 3 Turn off the water supply to the ice machine Step 4 Place ICE OFF CLEAN toggle switch in the CLEAN position The dump valve will open and drain the water from the evaporator and reservoir Step 5 Wait approximately 30 seconds or until the evaporator is drained and place the toggle switch in the OFF position Step 6 Refer to char...

Page 40: ...ressor will energize and produce ice with the cleaning solution Continue the freeze cycle for 15 minutes Step 3 Move the toggle switch to the OFF position then follow the standard cleaning and sanitizing procedures Important Leave the cleaner water solution in the evaporator for a minimum of 4 hours ICE WATER ICE WATER ADD SOLUTION HERE ...

Page 41: ... 1 Remove panels and set the ICE OFF CLEAN toggle switch to the OFF position Step 2 Turn off the water supply to the ice machine Step 3 Remove all ice from the bin Step 4 Place ICE OFF CLEAN toggle switch in the CLEAN position The dump valve will open and drain the water from the evaporator and reservoir Step 5 Wait approximately 30 seconds or until the evaporator is drained and place the toggle s...

Page 42: ...ll freeze and discharge the cleaning solution into the bin Allow the cycle to run for 15 minutes Step 12 Place the toggle switch in the OFF position and discard all ice produced during the cleaning process Step 13 Turn off the water supply to the ice machine Step 14 Place ICE OFF CLEAN toggle switch in the CLEAN position The dump valve will open and drain the water from the evaporator and reservoi...

Page 43: ...le switch to the ICE position The compressor will energize and produce ice with the sanitizing solution Step 21 The ice machine will freeze and discharge the sanitizing solution into the bin Allow the cycle to run for 15 minutes Step 22 Discard all ice produced during the sanitizing process Step 23 Place the toggle switch in the CLEAN position The ice machine will automatically time out a series o...

Page 44: ...a wire brush to carefully clean the parts 5 Use the solution and a brush to clean all disassembled components and the inside of the bin 6 Re install the removed parts and turn on the water and electrical supply Warning Disconnect electric power to the ice machine at the electric switch box before proceeding Warning Wear rubber gloves and safety goggles and or face shield when handling Ice Machine ...

Page 45: ...ds to drain water from reservoir then move toggle switch to Off position 3 Run dispenser to transfer all ice from the bin to a container 4 Disconnect electrical power to the ice machine 5 Remove top cover A Remove two screws B Lift up on top cover to remove Warning Disconnect electric power to the ice machine at the electric switch box before proceeding REMOVE SCREWS ...

Page 46: ...38 Part Number STH044 10 13 6 Remove front cover A Lift up on front cover B Pull forward to disengage keyhole slots 7 Remove side panels ...

Page 47: ...Part Number STH044 10 13 39 8 Remove ice chute cover A Turn the two thumbscrews 1 4 turn B Lift to remove cover LOOSEN SCREWS ...

Page 48: ...40 Part Number STH044 10 13 9 Lift out ice damper ...

Page 49: ...Part Number STH044 10 13 41 10 Lift out ice strainer ramp ...

Page 50: ...42 Part Number STH044 10 13 11 Turn ice wiper counterclockwise to remove ...

Page 51: ...Part Number STH044 10 13 43 12 Loosen ice chute hose clamp 13 Disconnect ice chute drain 14 Lift up on ice chute to remove The ice chute must be removed before the bin cover can be removed ...

Page 52: ...44 Part Number STH044 10 13 15 The ice chute can be cleaned in place If complete removal is desired use a phillips screwdriver to remove the Hall Effect Switch assembly from the ice chute REMOVE SCREW ...

Page 53: ...Part Number STH044 10 13 45 16 Remove three thumbscrews then remove bin cover REMOVE THUMBSCREWS ...

Page 54: ...nscrew the upright agitator bar NOTE Bar must be reassembled by inserting front edge into the paddle wheel then lowering the back edge rounded 90 angle to prevent water leakage into the compressor compartment RNS012 REMOVE THUMBSCREW AND AGITATOR BAR RNS020 REMOVE AGITATOR AGITATOR BAR AND ICE BREAKER ...

Page 55: ...Part Number STH044 10 13 47 18 Remove ice deflector A Remove the two thumbscrews B Lift the ice deflector out REMOVE THUMBSCREW ...

Page 56: ...48 Part Number STH044 10 13 19 Remove ice dispensing wheel by lifting straight out ...

Page 57: ...Part Number STH044 10 13 49 20 Water Reservoir Cover Removal A Push up on cover to snap off ...

Page 58: ...ve is not leaking do not remove it Instead follow the Cleaning Procedure Follow the procedure below to remove the dump valve 1 Depress and twist the coil 1 8 turn counterclockwise 2 Leaving the wires attached lift the coil assembly off the valve body 3 Remove the plunger nylon gasket and diaphragm from the valve body NOTE At this point the water dump valve can easily be cleaned If complete removal...

Page 59: ...Remove the tubing from the dump valve by twisting the clamps off 5 Remove the valve body from mounting bracket by twisting counterclockwise Dump Valve Disassembly MOUNTING BRACKET NYLON WASHER SPRING PLUNGER DIAPHRAM VALVE BODY COIL ...

Page 60: ...ndenser fins 3 Shine a flashlight through the condenser to check for dirt between the fins If dirt remains A Blow compressed air through the condenser fins from the inside Be careful not to bend the fan blades B Use a commercial condenser coil cleaner Follow the directions and cautions supplied with the cleaner 4 Straighten any bent condenser fins with a fin comb 5 Carefully wipe off the fan blade...

Page 61: ...r or the electric service switch 2 Turn off the water supply 3 Disconnect and drain the incoming ice making water line at the rear of the ice machine 4 Disconnect drain tubing from the inlet to dump valve and drain water into container and discard 5 Make sure water is not trapped in any of the water or drain lines Caution If water is allowed to remain in the ice machine in freezing temperatures se...

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Page 63: ...til manually restarted SafeGuard Indicator Lights During a SafeGuard Mode the corresponding light disch temp water level or speed will flash continuously The SafeGuard will remain in memory for 48 hours of ice making time After 48 hours of ice making time the SafeGuard will automatically be erased If power is interrupted during the 48 hours the timing will resume when power is applied to the ice m...

Page 64: ...Step 2 B If the ice machine does not restart see Ice Machine Does Not Operate 2 Allow the ice machine to run to determine if the condition is reoccurring A If the ice machine continues to run the condition has corrected itself Allow the ice machine to continue running B If the ice machine stops determine the safeguard mode then refer to the specific safeguard for troubleshooting procedures ...

Page 65: ...starting During the freeze cycle if the water float opens for 30 seconds the ice machine will 1 De energize the compressor and gearmotor 2 The Water Ok light on the control board will de energize 3 A 15 minute delay is initiated The water Ok light will flash when the float switch closes or when the toggle switch is placed in the OFF position The ice machine will remain off until the 15 minute dela...

Page 66: ...amper is open 3 A 15 minute delay is initiated 4 After the 15 minute delay the ice machine will A Energize the dump valve for 30 seconds B Energize the gear motor C Wait until the water float valve closes and then energize the compressor and fan motor 5 If the ice damper fails to open close at least once in the initial 8 minute period the control board will initiate another safety shutdown This se...

Page 67: ...Part Number STH044 10 13 59 Reset Procedure Move the ICE OFF CLEAN toggle switch from OFF to ICE or disconnect and reapply power to the ice machine ...

Page 68: ...y ends the ice machine starts The following lights are energized Nugget HES 1 HES 2 Water OK The HES 1 light will de energize and re energize as ice passes beneath the ice damper When the ice damper lifts approximately 45 degrees HES 2 de energizes and the ice machine shuts off immediately on full bin A 15 minute time delay is initiated which prevents the ice machine from immediately restarting Wa...

Page 69: ...0 Power Supplied to Ice Machine Plug In Ice Machine Reset Breaker NO Ice Machine Will Not Run IMPORTANT A Five Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 70: ...wer At Terminals 90 39 Refer To High Pressure Cutout Specifications NO IMPORTANT A Five Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start YES YES ...

Page 71: ...rt Number STH044 10 Reservoir Full Of Water NO YES Restore Water Supply YES IMPORTANT A Five Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 72: ...t Energized Hes 2 Light Energized YES YES NO NO Refer To Hall Effect Switch Diagnostics IMPORTANT A Five Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 73: ...44 10 5 Minute Delay Expired Wait For Delay To Expire Then Refer To SafeGuards YES YES No IMPORTANT A Five Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 74: ...nly during the Freeze cycle etc When do you notice low ice production one day a week every day on weekends etc Can you describe exactly what the ice machine seems to be doing Has anyone been working on the ice machine During store shutdown is the circuit breaker water supply or air temperature altered Is there any reason why incoming water pressure might rise or drop substantially INSTALLATION VIS...

Page 75: ...water regulator valve or increase the water pressure Incoming water temperature is not between 45 F 1 7 C and 90 F 32 2 C If too hot check the hot water line check valves in other store equipment Water filtration is plugged if used Install a new water filter Vent tube is not installed on water outlet drain See installation instructions Hoses fittings etc are leaking water Repair replace as needed ...

Page 76: ... for 7 minutes and 12 seconds or for more accuracy 14 minutes and 24 seconds 3 Weigh the container and ice then deduct the weight of the container 4 Convert ounces to pounds 5 Example 3 lbs 12 oz converts to 3 75 lbs 6 12 oz 16 oz 75 lb 7 Determine the 24 hour ice production capacity 7 minutes 12 seconds Multiply the total ice weight by 200 14 minutes 24 seconds Multiply the total ice weight by 10...

Page 77: ...ompare the actual discharge pressure step 3 with the published discharge pressure step 2 The discharge pressure is normal when the actual pressure falls within the published pressure range for the ice machine s operating conditions Discharge Pressure High Checklist Problem Cause Improper installation Refer to Installation Visual Inspection Checklist Restricted condenser air flow Dirty air filter H...

Page 78: ...mproper refrigerant charge Undercharged Wrong type of refrigerant Other Low ambient temperature Non Manitowoc components in system High side refrigerant lines component restricted before mid condenser Suction pressure is too low and affecting discharge pressure Refer to Suction Pressure Low Checklist No water or insufficient pressure Expansion valve incorrectly adjusted Defective compressor Moistu...

Page 79: ...ist Problem Cause Improper installation Refer to Installation Visual Inspection Checklist Discharge pressure Discharge pressure is too high and is affecting suction pressure Refer to Discharge Pressure High Checklist Improper refrigerant charge Overcharged Wrong type of refrigerant Non condensible in system Other Dump valve leaking Non Manitowoc components in system Expansion valve incorrectly adj...

Page 80: ...r to Discharge Pressure Low Checklist Improper refrigerant charge Undercharged Wrong type of refrigerant Other Non Manitowoc components in system Restricted plugged liquid line drier Restricted plugged tubing in suction side of refrigeration system Expansion valve starving No water or insufficient pressure Moisture in refrigeration system Dirty Evaporator NOTE Do not limit your diagnosis to only t...

Page 81: ...rgized control board lights do not indicate a good fuse 2 Remove the fuse Check for continuity across the fuse with an ohmmeter Warning High line voltage is applied to the control board at all times Removing the control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board Warning Disconnect electrical power to the entire ice machine before proceedin...

Page 82: ...ter be used to check toggle switch operation 1 Inspect the toggle switch for correct wiring 2 Isolate the toggle switch by disconnecting the Molex connector 3 Check continuity across the toggle switch terminals Note where the wire numbers are connected to the switch terminals or refer to the wiring diagram to take proper readings 4 Replace the toggle switch if continuity readings do not match all ...

Page 83: ...servoir cover The reservoir cover must be in place and water must be present in the reservoir to close the switch Verify water is supplied to the float valve the water inlet screen is clean and the float and float arm are free moving 1 Disconnect power to the ice machine 2 Disconnect the float switch from the control board and connect an ohm meter to the switch wires 3 Verify the switch is in the ...

Page 84: ...en and close at least once every 90 seconds during the freeze cycle Hall Effect Switch 2 Shut Off and Restart This switch also works in conjunction with the ice damper When the switch opens the ice machine stops immediately The ice machine restarts when the switch re closes and the five minute delay period expires FUNCTION TEST Place toggle switch in OFF position HES 1 and HES 2 lights will energi...

Page 85: ... Hall Effect Switch Housing in place SWITCH FAILS OPEN OR IS DISCONNECTED HES 1 1 Reset line voltage to the ice machine 2 Wait 15 minutes for delay to expire 3 HES 1 light energizes and ice machine starts 4 When 15 minute delay period ends the ice machine shuts off and flashes the HES 1 light HES 2 1 Reset line voltage to the ice machine 2 Wait 15 minutes for delay to expire 3 HES 2 light is energ...

Page 86: ...ilure modes HES 1 is energized HES 2 is de energized the ice machine will not start HES 1 and HES 2 lights are de energized the ice machine will not start HES 1 and HES 2 are energized The ice machine starts immediately shuts off and starts another 15 minute delay period control board lights race to indicate 15 minute delay period The ice machine will repeat the sequence until the toggle switch is...

Page 87: ...ize when a selection is pressed Replace touch pad Each touch pad LED energizes de energizes as selections are pressed Go to next step Step 3 Isolate and ohm the ice dispense switch Wires 59 60 The selector switch closes when depressed and opens when released Switch does not close open when the switch is pressed released Replace switch Switch closes opens as the switch is pressed released Go to nex...

Page 88: ... are pressed Go to next step Step 3 Verify line voltage is supplied to touchless sensing control board at wires 49 50 Will Not Dispense Disconnect wires from C common and NO normally open terminals on the sensor control board Use an ohm meter to verify the switch is opening and closing Place hand in front of sensor if the sensor activates and closes the switch the sensor is working correctly If th...

Page 89: ...sor If the dispensing continues disconnect wires 59 60 from the control board Check resistance across control board contacts Closed Replace the touchless sensing control board Open Dispense control board is not functioning correctly check control board relays Replace the selector switch if ohm readings do not match all three switch settings ...

Page 90: ...r is depressed CHECK 1 Inspect the selector switch for correct wiring 2 Isolate the switch by disconnecting all wires from the switch 3 Check across the switch terminals with an ohm meter Replace the selector switch if ohm readings do not match Activation Lever Position Resistance Reading Depressed Closed Released Open ...

Page 91: ...opening and closing Place hand in front of sensor if the sensor activates and closes the switch the sensor is working correctly 4 If the sensor does not activate disconnect the sensor wire from the sensor control board Short 5 and SIG If the contacts close replace the sensor If the contacts remain open replace the sensor control board Will Not Stop Dispensing 1 Disconnect sensor plug from sensor c...

Page 92: ...ect main power supply to the ice machine 6 Set ICE OFF CLEAN switch to ICE 7 No water or air flowing through the condenser will cause the HPCO control to open because of excessive pressure Watch the pressure gauge and record the cut out pressure Replace the HPCO control if it 8 Will not reset below 300 psig 2068 kPa 20 68 bar 9 Does not open at the specified cut out point Specifications Cut Out Cu...

Page 93: ...K PROCEDURE 1 Verify fan motor windings are not open or grounded and fan spins freely 2 Connect manifold gauge set to ice machine 3 Hook voltmeter in parallel across the fan cycle control leaving wires attached 4 Refer to chart below Specifications Cut In Close Cut Out Open 250 psig 5 200 psig 5 FCC Setpoint Reading Should Be Fan Should Be Above Cut In 0 Volts Running Below Cut Out Line Voltage Of...

Page 94: ...pens at pressures below setpoint CHECK PROCEDURE 1 Connect manifold gauge set to suction access valve 2 Disconnect wires from low pressure switch and connect ohm meter across LPCO terminals Replace the LPCO control if it 1 Is not closed at the specified setpoint 2 Does not open at the specified setpoint Specifications Cut Out Cut In Current Production Replacement Part 17 psig 5 35 psig 7 ...

Page 95: ...ESSORS 1 Disconnect power then remove the wires from the compressor terminals 2 The resistance values between C and S and between C and R when added together should equal the resistance value between S and R 3 If the overload is open there will be a resistance reading between S and R and open readings between C and S and between C and R Allow the compressor to cool then check the readings again Ch...

Page 96: ... turning slowly and is not seized Check the capacitors and relay COMPRESSOR DRAWING HIGH AMPS The continuous amperage draw on start up should not be near the maximum fuse size indicated on the serial tag Diagnosing Capacitors If the compressor attempts to start or hums and trips the overload protector check the starting components before replacing the compressor Visual evidence of capacitor failur...

Page 97: ...d test is to install a known good substitute capacitor Use a capacitor tester when checking a suspect capacitor Clip the bleed resistor off the capacitor terminals before testing Relay The relay has a set of contacts that connect and disconnect the start capacitor from the compressor start winding The contacts on the relay are normally closed start capacitor in series with the start winding The re...

Page 98: ...lay 4 Move toggle switch to the ICE position 5 The compressor start winding should energize for less than 1 second Continued high amperage draw could indicate Low incoming power supply Check voltage at compressor start up when load is greatest Defective relay Defective capacitor Defective compressor 6 Verify voltage and replace all start components 7 If all of the previous tests are satisfactory a...

Page 99: ...d regulations Make these connections Suction side of the compressor through the suction service valve Discharge side of the compressor through the discharge service valve Important Manitowoc Ice assumes no responsibility for the use of contaminated refrigerant Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company Important Replace the liquid ...

Page 100: ... s instructions B Evacuation prior to recharging Pull the system down to 250 microns Then allow the pump to run for an additional half hour Turn off the pump and perform a standing vacuum leak check NOTE Check for leaks using an electronic leak detector after charging the ice machine 4 Follow the Charging Procedures on the next page RECOVERY EVACUATION CONNECTIONS OPEN OPEN VACUUM PUMP RECOVERY UN...

Page 101: ...the proper refrigerant charge shown on nameplate through the discharge access valve 5 Let the system settle for 2 to 3 minutes 6 Place the toggle switch in the ICE position Important The charge is critical on all Manitowoc ice machines Use a scale to ensure the proper charge is installed MANIFOLD SET LOW SIDE ACCESS VALVE CLOSED OPEN CLOSED OPEN REFRIGERANT CYLINDER VACUUM PUMP RECOVERY UNIT HIGH ...

Page 102: ...disconnecting the charging hoses A Run the ice machine in the Freeze cycle B Remove the quick disconnect fitting from the high side access valve at the ice machine C Open the low side service valve at the ice machine D Open the high and low side valves on the manifold gauge set Any refrigerant in the lines will be pulled into the low side of the system E Allow the pressures to equalize while the i...

Page 103: ...agnostic tool These devices sample refrigerant eliminating the need to take an oil sample Follow the manufacturer s directions If a refrigerant test kit indicates harmful levels of contamination or if a test kit is not available inspect the compressor oil 1 Remove the refrigerant charge from the ice machine 2 Remove the compressor from the system 3 Check the odor and appearance of the oil 4 Inspec...

Page 104: ...hows contamination Leak in water cooled condenser No burnout deposits in open compressor lines Mild contamination cleanup procedure Mild Compressor Burnout symptoms Oil appears clean but smells acrid Refrigeration test kit or acid oil test shows harmful acid content No burnout deposits in open compressor lines Mild contamination cleanup procedure Severe Compressor Burnout symptoms Oil is discolore...

Page 105: ...ns Break the vacuum with dry nitrogen and sweep the system Pressurize to a minimum of 5 psig 35 kPa 35 bar B Pull vacuum to 500 microns Break the vacuum with dry nitrogen and sweep the system Pressurize to a minimum of 5 psig 35 kPa 35 bar C Change the vacuum pump oil D Pull vacuum to 500 microns Run the vacuum pump for 1 2 hour on self contained models 1 hour on remotes NOTE You may perform a sta...

Page 106: ...n system with dry nitrogen 5 Install a new compressor and new start components 6 Install a suction line filter drier with acid and moisture removal capability Place the filter drier as close to the compressor as possible 7 Install an access valve at the inlet of the suction line drier 8 Install a new liquid line drier Important Refrigerant sweeps are not recommended as they release refrigerant int...

Page 107: ...reliminary leak check You should use an electronic leak detector after system charging to be sure there are no leaks 10 Charge the system with the proper refrigerant to the nameplate charge 11 Operate the ice machine for one hour Then check the pressure drop across the suction line filter drier A If the pressure drop is less than 1 psig 7 kPa 7 bar the filter drier should be adequate for complete ...

Page 108: ... control as feasible See the figure on next page Clamp down on the tubing until the pinch off is complete 3 Cut the tubing of the defective component with a small tubing cutter 4 Solder the replacement component in place Allow the solder joint to cool 5 Remove the pinch off tool 6 Re round the tubing Position the flattened tubing in the proper hole in the pinch off tool Tighten the wing nuts until...

Page 109: ...Part Number STH044 10 13 101 SV1406 FIG A PINCHING OFF TUBING FIG B RE ROUNDING TUBING USING PINCH OFF TOOL ...

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Page 111: ...y part The drier must be replaced any time the system is opened for repairs The size of the filter drier is important The refrigerant charge is critical Using an improperly sized filter drier will cause the ice machine to be improperly charged with refrigerant Listed below is the recommended OEM field replacement drier Cut Out Cut In 450 psig 10 3103 kPa 69 31 bar 69 Automatic Reset Must be below ...

Page 112: ...nes are charged using R 404A refrigerant Important This information is for reference only Refer to the ice machine serial number tag to verify the system charge Serial plate information overrides information listed on this page Model Refrigerant Charge RNS012A RNS020A 10 oz 284 g ...

Page 113: ...chart are considered normal This is due to variances in water and air temperature Actual temperatures will seldom match the chart exactly Zero out manifold gauge set before obtaining pressure readings to avoid misdiagnosis Discharge and suction pressure are highest at the beginning of the cycle Allow system to stabilize then verify the pressures are within the range indicated All pressure readings...

Page 114: ...tering Condenser F C Water Temperature F C 50 10 70 21 90 32 50 10 325 300 280 70 21 300 275 255 80 27 265 250 230 90 32 240 225 210 100 38 210 195 185 OPERATING PRESSURES PSIG Air Temperature Entering Condenser F C Freeze Cycle Discharge Pressure Suction Pressure 50 10 170 180 38 42 70 21 230 260 38 42 90 32 270 320 38 42 100 38 320 375 38 42 110 43 340 400 38 42 ...

Page 115: ...tering Condenser F C Water Temperature F C 50 10 70 21 90 32 50 10 325 300 280 70 21 300 275 255 80 27 265 250 230 90 32 240 225 210 100 38 210 195 185 OPERATING PRESSURES PSIG Air Temperature Entering Condenser F C Freeze Cycle Discharge Pressure Suction Pressure 50 10 170 180 38 42 70 21 230 270 38 42 90 32 280 330 38 42 100 38 330 385 38 42 110 43 260 420 38 42 ...

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Page 117: ...e following symbols are used on all of the wiring diagrams Internal Compressor Overload Some models have external compressor overloads Fan Motor Run Capacitor Some models do not incorporate fan motor run capacitor Wire Number Designation The number is marked at each end of the wire Multi Pin Connection Electrical Box Side Compressor Compartment Side Warning Always disconnect power before working o...

Page 118: ...12 RNS020 115 60 1 230 50 1 Refer to Nameplate for Voltage Rating TOUCH PAD BLUE LED HES 1 HES 2 FLOAT SW TOGGLE SWITCH HALL EFFECT SWITCH ASSY ICE CLEAN OFF 2 1 6 66 65 67 68 69 B K RED HES1 GRN HES2 GRN CLEAN YEL WATER GRN MAIN FUSE ...

Page 119: ...onic Control Board RNS012 RNS020 CONTROL BOARD BLUE LED HES 1 HES 2 FLOAT SW TOGGLE SWITCH HALL EFFECT SWITCH ASSY ICE CLEAN OFF 2 1 6 66 65 67 68 69 B K RED HES1 GRN HES2 GRN CLEAN YEL WATER GRN AC LINE VOLTAGE ELECTRICAL PLUG MAIN FUSE ...

Page 120: ... Green works in conjunction with the Hall Effect Switch 2 When the ice damper is closed the light is on Clean Yellow indicates the unit is in a clean sequence Water Energizes when the water level in the reservoir closes raises the float switch De energizes when the float switch opens Racing Lights All lights racing indicates a 15 minute delay period is timing out ...

Page 121: ...Part Number STH044 10 13 113 Refrigeration Tubing Schematic RNS012 RNS020 DRIER EXPANSION VALVE EVAPORATOR HEAT EXCHANGER COMPRESSOR AIR CONDENSER ...

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Page 124: ...Manitowoc Manitowoc Ice 2110 South 26th Street P O Box 1720 Manitowoc WI 54221 1720 USA Ph 920 682 0161 Fax 920 683 7589 Visit us online at www manitowocice com 2013 Part Number STH044 10 13 ...

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Manitowoc RNS012, Technician'S Handbook

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