Manitowoc CNF201A Technician'S Handbook Download Page 67

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Part Number 000015432 4/18

ANALYZING DISCHARGE PRESSURE

1. Determine the ice machine operating conditions:

•  Air temperature entering condenser
•  Air temperature around ice machine
•  Water temperature entering water reservoir

2. Refer to 24-Hour Ice Production/Refrigeration

Pressure Chart for ice machine being checked.
Use the operating conditions determined in Step 1 to

find the published normal discharge pressures and

compare to actual discharge pressure readings.

3. Measure the actual discharge pressure.
4. Compare 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

High inlet air temperature

Condenser discharge air recirculation

Dirty condenser fins

Defective fan motor

Improper

refrigerant

charge

Overcharged

Non-condensible in system

Wrong type of refrigerant

Other

Non-Manitowoc components in system

High side refrigerant line/component restricted

(before mid-condenser)

Summary of Contents for CNF201A

Page 1: ...Part Number 000015432 4 18 Countertop Nugget Ice Machines CNF201 CNF202 Technician s Handbook ...

Page 2: ......

Page 3: ...ntact information for service agents in your area 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 an...

Page 4: ...the disconnect means to satisfy local codes Refer to rating plate for proper voltage This appliance must be grounded This equipment must be positioned so that the plug is accessible unless other means for disconnection from the power supply e g circuit breaker or disconnect switch is provided Check all wiring connections including factory terminals before operation Connections can become loose dur...

Page 5: ...non OEM ice storage system with this ice machine contact the bin manufacturer to assure their ice deflector is compatible Remove all removable panels before lifting and installing and use appropriate safety equipment during installation and servicing Two or more people are required to lift or move this appliance to prevent tipping and or injury Do not damage the refrigeration circuit when installi...

Page 6: ...air between approximately 2 1 and 9 5 by volume LEL lower explosion limit and UEL upper explosion limit An ignition source at a temperature higher than 470 C is needed for a combustion to occur Refer to nameplate to identify the type of refrigerant in your equipment Only trained and qualified personnel aware of the dangers are allowed to work on the equipment Read this manual thoroughly before ope...

Page 7: ... chemicals rubber gloves and eye protection and or face shield must be worn DANGER Do not operate equipment that has been misused abused neglected damaged or altered modified from that of original manufactured specifications This appliance is not intended for use by persons including children with reduced physical sensory or mental capabilities or lack of experience and knowledge unless they have ...

Page 8: ... must be in place and properly secured when operating this equipment Risk of fire shock All minimum clearances must be maintained Do not obstruct vents or openings Failure to disconnect power at the main power supply disconnect could result in serious injury or death The power switch DOES NOT disconnect all incoming power All utility connections and fixtures must be maintained in accordance with t...

Page 9: ...n Location of Ice Machine 15 Ice Machine Clearance Requirements 16 Ice Machine Heat of Rejection 16 Electrical Service 17 Circuit Ampacity 17 Ice Machine Head Section Water Supply and Drains 18 Potable Water Supply 18 Potable Water Inlet Lines 18 Drain Connections 19 Operation 21 Ice Making Sequence of Operation 21 CNF201 CNF202 Nugget Machines 21 Touch Pad Sequence of Operation 23 Water Level Che...

Page 10: ...d Sanitizing 37 General Information 37 Cleaning the Condenser 51 Removal from Service Winterization 52 General 52 Troubleshooting SafeGuard Feature 53 SafeGuards 55 No Water 55 No Ice Production 56 Ice Machine Will Not Run Diagnostics 58 Refrigeration Diagnostics 64 Before Beginning Service 64 Installation Visual Inspection Checklist 64 Water System Checklist 65 Ice Production Quality Check 66 Ana...

Page 11: ...l 82 Fan Cycle Control 83 Low Pressure Cutout LPCO Control 84 Compressor Electrical Diagnostics 85 Diagnosing Start Components 87 Refrigerant Recovery Evacuation 89 Normal Self Contained Procedures 89 System Contamination Clean Up 93 Determining Severity of Contamination 93 Cleanup Procedure 95 Replacing Pressure Controls Without Removing Refrigerant Charge 98 Component Specifications Main Fuse 10...

Page 12: ... Ice Production Refrigerant Pressure Charts 103 CNF201 104 CNF202 105 Diagrams Wiring Diagrams 107 CNF201 CNF202 115 60 1 230 60 1 230 50 1 108 Electronic Control Board 110 CNF201 CNF202 Control Board 110 Refrigeration Tubing Schematic 112 CNF201 CNF202 112 ...

Page 13: ...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 cleaner Damage to...

Page 14: ...chless sensing can be ordered installed on the ice machine from the factory or a field conversion kit is available The field conversion kit includes a replacement front panel and instructions for installation Ice Machine Warranty Information For warranty information visit http www manitowocice com Service Warranty Warranty Verification Warranty Registration View and download a copy of the warranty...

Page 15: ...rating equipment or in direct sunlight The location must be capable of supporting the weight of the ice machine and a full bin of ice and allow the ice machine to be level front to back and side to side The location must allow enough clearance for water and electrical connections in the rear of the ice machine The drain can be routed out the rear or bottom of dispenser The location must not obstru...

Page 16: ...t of Rejection Air Conditioning CNF201 CNF202 2 300 BTU Hour Because the heat of rejection varies during the ice making cycle the figure shown is an average Ice machines like other refrigeration equipment reject heat through the condenser It is helpful to know the amount of heat rejected by the ice machine when sizing air conditioning equipment where self contained air cooled ice machines are inst...

Page 17: ...da nWarning The ice machine must be grounded in accordance with national and local electrical codes CIRCUIT AMPACITY The 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 qualifi...

Page 18: ...ns supplied with the filter system for ice making water inlet connections POTABLE WATER INLET LINES Follow these guidelines to install water inlet lines Do not connect the ice 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...

Page 19: ...s must have a 1 5 in drop per 5 ft of run 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 drain line Insulate to prevent condensation Vent the bin drain to the atmosphere Drains must have a union or other suitable means to allow a place of disconnection from the ice machine when servicing is required ...

Page 20: ...20 Part Number 000015432 4 18 THIS PAGE INTENTIONALLY LEFT BLANK ...

Page 21: ...tch must be closed water reservoir full of water and water sensing float in the up position INITIAL START UP A 15 minute delay period must expire The delay period starts to time out upon application of power and can only be overridden by depressing the test switch on the control board The gear motor energizes and when water in the reservoir closes the water sensing float switch the compressor and ...

Page 22: ...s When the 15 minute 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 45 seconds the dump valve de energizes When the reservoir fills with water the water sensing switch closes and the compressor and condenser fan motor ...

Page 23: ... Water or Ice Water will energize the corresponding blue Led selection and waits for dispense lever or touchless sensor activation 2 Depressing the dispense lever or activating the touchless sensor closes the relay selected with the touch pad Depending on selection either the water solenoid ice dispense motor or both components activate WATER LEVEL CHECK The float valve maintains the correct water...

Page 24: ... Until Ice Holds Damper Open Freeze Cycle On Off On Moves to Verify Ice Production Automatic Shut Off Off Off Off Open Until Damper Closes Restart More than 30 minutes have passed since automatic shutoff cycle initiated Off On Off Closed 45 Second Flush cycle Initial Startup Off Off On Closed 5 Seconds Restart Less than 30 minutes have passed since automatic shutoff cycle initiated Off Off On Clos...

Page 25: ...n 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 nWarning Wear rubber gloves and safety goggles and or face shield when handling ice machine C...

Page 26: ...eak 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 gearbo...

Page 27: ... 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 28: ...l flow through the water dump valve and down the drain Step 2 Remove the top panel and translucent plastic ice chute cover Wait about one minute then add the proper amount of Manitowoc Ice Machine Cleaner Rinse the cleaner from the top of the evaporator with 2 ounces 60 ml of clear water and re install cover Caution Use only Manitowoc approved Ice Machine Cleaner part number 000000084 It is a viol...

Page 29: ...ly 30 minutes NOTE Periodic cleaning 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 ...

Page 30: ... 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 31: ...ggle 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 cha...

Page 32: ... cleaner water solution in the evaporator for a minimum of 4 hours Step 8 Move the toggle switch to the ICE position The compressor will energize and produce ice with the cleaning solution Continue the freeze cycle for 15 minutes Step 9 Move the toggle switch to the OFF position then follow the standard cleaning and sanitizing procedures ...

Page 33: ...ove 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 switch ...

Page 34: ...ce chute cover and allow the ice machine to stand for 30 minutes Step 9 Turn on the water supply to the ice machine Step 10 Move the toggle switch to the ICE position The compressor will energize and produce ice with the cleaning solution Step 11 The ice machine will freeze and discharge the cleaning solution into the bin Allow the cycle to run for 15 minutes NOTE Discard all ice produced during t...

Page 35: ...rator and reservoir Step 3 Wait approximately 30 seconds or until the evaporator is drained and place the toggle switch in the OFF position Step 4 Refer to chart and premix the correct solution of sanitizer and cool water for your model ice machine Model Amount of Sanitizer Part Number 9405653 Amount of Water CNF201 CNF202 2 ounces 60 ml 3 gallons 11 4L Step 5 Remove the top cover from the ice chu...

Page 36: ...iscard all ice produced during the sanitizing process Step 11 Place the toggle switch in the CLEAN position The ice machine will automatically time out a series of flush and rinse cycles and then stops This entire cycle lasts approximately 30 minutes Step 12 Refer to Component Disassembly for Cleaning and Sanitizing and remove clean and sanitize all parts listed ...

Page 37: ...s in a manner inconsistent with their labeling GENERAL INFORMATION The ice machine must be disassembled cleaned and sanitized every six months 1 Turn off the water supply to the ice machine at the water service valve or disconnect water supply line at float valve quick disconnect by depressing stainless steel lever 2 Remove the components you want to clean or sanitize See the pages specific to the...

Page 38: ...l of Parts for Cleaning or Sanitizing 1 Turn off water supply to ice machine 2 Place toggle switch in the clean position for 30 seconds 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 nWarning Disconnect electric power to the ice machine at the electric switch box before proceeding 4 Disconnect electrical power t...

Page 39: ...Part Number 000015432 4 18 39 Remove Screws ...

Page 40: ...40 Part Number 000015432 4 18 6 Remove front cover A Lift up on front cover B Pull forward to disengage keyhole slots 7 Remove side panels ...

Page 41: ...Part Number 000015432 4 18 41 8 Remove ice chute cover A Turn the two thumbscrews 1 4 turn B Lift to remove cover Loosen Screws ...

Page 42: ...42 Part Number 000015432 4 18 9 Lift out ice damper ...

Page 43: ...Part Number 000015432 4 18 43 10 Lift out ice strainer ramp ...

Page 44: ...44 Part Number 000015432 4 18 11 Turn ice wiper counterclockwise to remove ...

Page 45: ...Part Number 000015432 4 18 45 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 46: ...46 Part Number 000015432 4 18 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 47: ...18 47 16 Remove three thumbscrews then remove bin cover REMOVE THUMBSCREWS Importan Do not pour cleaner or sanitizer solutions into the bin The solution will leak out of the front of the bin and into the compressor compartment ...

Page 48: ...Unscrew 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 CNF201 REMOVE THUMBSCREW AND AGITATOR BAR CNF202 REMOVE AGITATOR AGITATOR BAR AND ICE BREAKER ...

Page 49: ...Part Number 000015432 4 18 49 18 Remove ice deflector A Remove the two thumbscrews B Lift the ice deflector out REMOVE THUMBSCREW ...

Page 50: ...50 Part Number 000015432 4 18 19 Remove ice dispensing wheel by lifting straight out 20 Water Reservoir Cover Removal A Push up on cover to snap off ...

Page 51: ... solution 2 Clean the outside of the condenser with a soft brush or a vacuum with a brush attachment Clean from top to bottom not side to side Be careful not to bend the condenser 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...

Page 52: ...hine in freezing temperatures severe damage to some components could result Damage of this nature is not covered by the warranty 1 Disconnect the electric power at the circuit breaker 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 wat...

Page 53: ... a SafeGuard Mode the corresponding control board light 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 machine Placing the toggle switch in the OFF position The corresponding lig...

Page 54: ... 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 55: ...starting During the freeze cycle if the water float opens for 30 seconds the ice machine will 1 De energize the compressor and gear motor 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 del...

Page 56: ...period The control board must see the ice damper open close at least once every 90 seconds When the ice damper does not open close within the specified time the control board will 1 De energize the compressor and gear motor 2 HES 1 light on the control board will flash the light will not flash if the ice damper is open 3 A 15 minute delay is initiated 4 After the 15 minute delay the ice machine wi...

Page 57: ...achine is unable to run normally within 300 minutes of the initial shutdown If the ice machine does not run normally within 300 minutes of the initial shutdown the control board will lock out and require a manual reset The control board will flash the HES 1 light anytime the toggle switch is placed in the OFF position for the first 48 hours after the failure Reset Procedure Move the ICE OFF CLEAN ...

Page 58: ...nnected to the ice machine 1 Power is supplied to the control board 2 The control board lights race energize de energize in sequence to indicate the ice machine is in a 15 minute delay mode 3 When the 15 minute delay ends the ice machine starts The following lights are energized 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 ...

Page 59: ...ine Reset Control Board Disconnect And Reconnect Line Voltage Plug In Ice Machine Reset Breaker NO YES Ice Machine Will Not Run YES IMPORTANT A 15 Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 60: ...t Specifications NO Nugget Control Board Light Energized NO YES Replace Control Board IMPORTANT A 15 Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start YES YES Disconnect HES 2 From Control Board Light Energizes NO Replace HES 2 YES ...

Page 61: ...t On Reservoir Full Of Water NO YES NO YES NO Restore Water Supply Refer To Float Switch Diagnostics Install Close Damper Door YES YES IMPORTANT A 15 Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start ...

Page 62: ... YES YES NO NO Refer To Hall Effect Switch Diagnostics IMPORTANT A 15 Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start 15 Minute Delay Expired Wait For Delay To Expire Then Refer To SafeGuards YES YES No ...

Page 63: ...TANT A 15 Minute Delay Initiates After The Problem Is Corrected This Delay Must Expire Before The Ice Machine Will Start Refer to Control Board Fuse Diagnostics NO Refer to Toggle Switch Diagnostics YES Energized Toggle Switch Functions If The Toggle Switch Energizes And De Energizes The BLue Light The Toggle Switch Is Ok ...

Page 64: ...only 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 VI...

Page 65: ... 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 66: ...ner 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 Example 3 lbs 12 oz converts to 3 75 lbs 12 oz 16 oz 75 lb 5 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 100...

Page 67: ...Compare 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 ...

Page 68: ... 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 Moisture in refrigeration system NOTE Do not limit your diagnosis to only the ite...

Page 69: ...list 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 ad...

Page 70: ...fer 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...

Page 71: ... 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 CHECK PROCEDURE 1 Energized control board lights do not indicate a good fuse nWarning Disconnect electrical power to the entire ice machine before proceeding 2 Remove the fuse Check for continuity across the fuse with an ohmmeter Reading Resu...

Page 72: ...eter 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 Switch Setting Terminals Ohm Reading ICE 1 6 Open 1 2 Closed 2 6 Op...

Page 73: ...eservoir 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 74: ...pen 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 energ...

Page 75: ...e 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 ener...

Page 76: ...re modes HES 1 is energized HES 2 is de energized and the ice machine will not start HES 1 and HES 2 lights are de energized and 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 swit...

Page 77: ...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 78: ... 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 79: ...nsor 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 80: ...er 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 Activation Lever Position Resistance Reading Depressed Closed Released Open Replace the selector switch if ohm readings do not match ...

Page 81: ...s 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...

Page 82: ...machine 3 Connect manifold gauges to the access valves 4 Hook voltmeter in parallel across the HPCO leaving wires attached 5 Reconnect 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 nWarning If discharge p...

Page 83: ...cifications Cut In Close Cut Out Open 250 psig 5 200 psig 5 CHECK 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 FCC Setpoint Reading Should Be Fan Should Be Above Cut In 0 Volts Running Below Cut Out Line Voltage O...

Page 84: ...opens at pressures below setpoint Specifications Cut Out Cut In Current Production Replacement Part 17 psig 5 35 psig 7 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 ...

Page 85: ...RESSORS 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 C...

Page 86: ...s 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 failu...

Page 87: ...od 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 r...

Page 88: ...ween terminals 2 and 5 No resistance indicates an open coil Replace the relay 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 repl...

Page 89: ...ulting from the use of contaminated refrigerant is the sole responsibility of the servicing company Importan Replace the liquid line drier before evacuating and recharging Use only a Manitowoc OEM liquid line filter drier to prevent voiding the warranty CONNECTIONS Manifold gauge sets must utilize low loss fittings to comply with U S Government rules and regulations Make these connections Suction ...

Page 90: ...ALE CLOSED OPEN SV3055 RECOVERY EVACUATION CONNECTIONS 3 Perform recovery or evacuation A Recovery Operate the recovery unit as directed by the manufacturer 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...

Page 91: ...ACCESS VALVE HIGH SIDE ACCESS VALVE REFRIGERANT CYLINDER VACUUM PUMP RECOVERY UNIT SCALE OPEN CLOSED SV3055 CHARGING CONNECTIONS 2 Close the vacuum pump valve and the low side manifold gauge valve 3 Open the high side manifold gauge valve 4 Open the refrigerant cylinder and add the proper refrigerant charge shown on nameplate through the discharge access valve 5 Let the system settle for 2 to 3 mi...

Page 92: ... 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 ...

Page 93: ...ntamination Obvious moisture or an acrid odor in the refrigerant indicates contamination If either condition is found or if contamination is suspected use a Total Test Kit from Totaline or a similar diagnostic 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 i...

Page 94: ...shows 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 discolor...

Page 95: ...ation procedure except replace the evacuation step with the following A Pull vacuum to 1000 microns 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 t...

Page 96: ...pen system with dry nitrogen Importan Refrigerant sweeps are not recommended as they release refrigerant into the atmosphere 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 ...

Page 97: ...self contained models 1 hour on remotes NOTE You may perform a standing vacuum test to make a preliminary 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 ...

Page 98: ...pinch off tool around the tubing as far from the pressure control as feasible See the figure on next page Clamp down on the tubing until the pinch off is complete nWarning Do not unsolder a defective component Cut it out of the system Do not remove the pinch off tool until the new component is securely in place 3 Cut the tubing of the defective component with a small tubing cutter 4 Solder the rep...

Page 99: ...Part Number 000015432 4 18 99 FIG A PINCHING OFF TUBING Fig B re rounding tubing SV1406 Using Pinch Off Tool ...

Page 100: ...100 Part Number 000015432 4 18 THIS PAGE INTENTIONALLY LEFT BLANK ...

Page 101: ... be below 300 psig 2068 kPa 20 68 bar to reset FILTER DRIERS Driers are covered as a warranty 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 repla...

Page 102: ... ice machine serial number tag to verify the system charge Serial plate information overrides information listed on this page Model Refrigerant Charge CNF201 CNF202 9 oz 255 g Indicates preliminary data Model Serial plate information overrides the data in this chart NOTE All ice machines are charged using R 404A refrigerant ...

Page 103: ...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 must ...

Page 104: ...Temperature F C 50 10 70 21 90 32 50 10 325 300 280 70 21 310 275 260 80 27 265 250 230 90 32 240 225 210 100 38 210 195 185 110 43 180 165 150 Operating Pressures PSIG Air Temperature Entering Condenser F C Freeze Cycle Discharge Pressure Suction Pressure 50 10 180 210 28 31 70 21 210 230 28 31 90 32 260 290 28 31 100 38 320 375 28 31 110 43 360 380 28 31 NOTE Data is preliminary and subject to c...

Page 105: ...Temperature F C 50 10 70 21 90 32 50 10 325 300 280 70 21 310 275 260 80 27 265 250 230 90 32 240 225 210 100 38 210 195 185 110 43 180 165 150 Operating Pressures PSIG Air Temperature Entering Condenser F C Freeze Cycle Discharge Pressure Suction Pressure 50 10 180 210 28 31 70 21 210 230 28 31 90 32 260 290 28 31 100 38 320 375 28 31 110 43 360 380 28 31 NOTE Data is preliminary and subject to c...

Page 106: ...106 Part Number 000015432 4 18 THIS PAGE INTENTIONALLY LEFT BLANK ...

Page 107: ...before working on electrical circuitry Wiring Diagram Legend The 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 Co...

Page 108: ... 43 BLK 43 BLK 41 45 45 1 2 3 1 2 3 59 60 50 49 96 21 97 43 WHT GND 42 44 21 46 55 51 54 56 59 60 58 52 4 5 6 7 8 9 1 2 3 22 90 92 95 39 51 1 2 6 BLK RED 66 65 67 68 69 L1 L1 L1 L2 L2 L2 L1 L2 or N 230 50 1 230 60 1 115 60 1 GND 5 14 36 12 47 55 17 31 40 52 1 52 41 29 1 13 52 2 18 51 52 3 27 20 30 34 25 29 2 29 34 1 34 2 34 3 34 4 51 1 40 1 40 2 40 3 1 ...

Page 109: ...rator Overload 30 Hall Effect Switch 31 High Pressure Cutout 36 Low Pressure Control 34 LED HES1 34 1 LED HES2 34 2 LED Clean 34 3 LED Water Level 34 4 LED Blue Light 40 On Off Clean Switch 40 1 Ice 40 2 Off 40 3 Clean 41 See Control Board Schematic For Detail 47 Solenoid Valve Water Dispense 51 Touchless Control Board 51 1 Touchless Control Board Wiring 52 Touchless Control Pad 52 1 Ice Only Sele...

Page 110: ...110 Part Number 000015432 4 18 Electronic Control Board CNF201 CNF202 CONTROL BOARD RED BLK 2 11 1 67 66 65 69 68 28 34 3 34 34 2 34 1 54 1 34 4 40 40 1 40 2 40 3 27 30 ...

Page 111: ...ormer Control Board Lights HES 1 Green works in conjunction with the Hall Effect Switch 1 When the ice damper is closed the light is on HES 2 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 wh...

Page 112: ...15432 4 18 Refrigeration Tubing Schematic CNF201 CNF202 Number Component 1 Compressor 2 Condenser Air or Water Cooled 3 Liquid Line Filter Drier 4 Heat Exchanger 5 TXV Thermostatic Expansion Valve 6 Evaporator 1 2 3 4 5 6 ...

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Page 116: ...ns Our cutting edge designs and lean manufacturing tactics are powered by deep knowledge operator insights and culinary expertise All of our products are backed by KitchenCare our aftermarket repair and parts service Bringing innovation to the table WWW WELBILT COM CLEVELAND CONVOTHERM DELFIELD FITKITCHEN FRYMASTER GARLAND KOLPAK LINCOLN MANITOWOC MERCO MERRYCHEF MULTIPLEX 2018 Welbilt Inc except ...

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Manitowoc CNF201A, Technician'S Handbook

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