Download
Share
Print this page
Manitowoc UCP0050 Technician's Handbook
  1. Manuals
  2. Brands
  3. Manitowoc Manuals
  4. Ice Maker
  5. UCP0050
  6. Technician's handbook
Manitowoc UCP0050 Technician's Handbook

Manitowoc UCP0050 Technician's Handbook

Hide thumbs

Advertisement

Quick Links

Download this manual
UCP0050 Ice Machine
Technician's Handbook
This manual is updated as new information and models are
released. Visit our website for the latest manual.
www.manitowocice.com
Part Number STH115 Rev 00 04/24

Advertisement

loading
Need help?

Need help?

Do you have a question about the UCP0050 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Manitowoc UCP0050

Summary of Contents for Manitowoc UCP0050

  • Page 1 UCP0050 Ice Machine Technician’s Handbook This manual is updated as new information and models are released. Visit our website for the latest manual. www.manitowocice.com Part Number STH115 Rev 00 04/24...

  • Page 3: Safety Notices

    Safety Notices Read these precautions to prevent personal injury: • Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death. • Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.

  • Page 4: Safety Definitions

    Safety Definitions DANGER Indicates a hazardous situation that, if not avoided, may result in death or serious injury. This applies to the most extreme situations. Warning Indicates a hazardous situation that, if not avoided, may result in death or serious injury. Caution Indicates a hazardous situation which, if not avoided, may result in minor or moderate injury.
  • Page 5 Warning Follow these electrical requirements during installation of this equipment. • All field wiring must conform to all applicable codes of the authority having jurisdiction. It is the responsibility of the end user to provide the disconnect means to satisfy local codes. Refer to rating plate for proper voltage.
  • Page 6 Warning Follow these precautions to prevent personal injury during installation of this equipment: • Installation must comply with all applicable equipment fire and health codes with the authority having jurisdiction. • To avoid instability the installation area must be capable of supporting the combined weight of the equipment and product.
  • Page 7 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Legs or casters must be installed and the legs/casters must be screwed in completely. When casters are installed the mass of this unit will allow it to move uncontrolled on an inclined surface.
  • Page 8 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Objects placed or dropped in the bin can affect human health and safety. Locate and remove any objects immediately. • Never use sharp objects or tools to remove ice or frost.
  • Page 9 DANGER Follow these precautions to prevent personal injury during use and maintenance of this equipment: • It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures. • Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other Appliance.
  • Page 10 Warning When installing, using, or servicing this equipment, follow these flammable refrigeration system requirements. • Refer to the nameplate - The ice machine contains up to 150 grams of R290 (propane) refrigerant. R290 (propane) is flammable in concentrations of air between approximately 2.1% and 9.5% by volume.
  • Page 11 Warning Follow these precautions to prevent personal injury during use and maintenance of this equipment: • It is the responsibility of the site supervisor to ensure that operators fully understand the dangers inherent in operating this equipment. • Turn off and lockout all utilities (gas, electric, water) according to approved practices during maintenance or servicing.
  • Page 12 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 13: Table Of Contents

    Table of Contents Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Safety Definitions .
  • Page 14 Troubleshooting Ice Machine Will Not Run . . . . . . . . . . . . . . . . . . . 57 Installation/Visual Inspection Checklist .
  • Page 15 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...
  • Page 16 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...

  • Page 17: General Information

    General Information Model Numbers This manual covers the following models: Self-contained Air-cooled UCP0050A How to Read a Model Number Cube Size Capacity Condenser Series Type U  C   P - 0050  A P - R290 A - Air-cooled S - Square Warning An ice machine contains high voltage electricity and refrigerant charge.

  • Page 18: Model/Serial Number Location

    Model/Serial Number Location These numbers are required when requesting information from your local Manitowoc Distributor, Service Representative, or Manitowoc Ice. The model/serial number data plate is located in the evaporator compartment and on the back of the ice machine. Warranty For warranty information visit: www.manitowocice.com/Service/Warranty...

  • Page 19: Installation

    Installation Location of Ice Machine The location selected for the ice machine must meet the following criteria. If any of these criteria are not met, select another location. • The location must be indoors. • The location must be free of airborne and other contaminants.

  • Page 20: Ice Machine Clearance Requirements

    Ice Machine Clearance Requirements Self-contained Air-cooled* Top/Sides 5" (13 cm) Back 5” (13 cm) Front 24” (61 cm) *The ice machine may be built into a cabinet. Ice Machine Heat of Rejection Air Conditioning: 1,145 BTU/hr (289 kcal/hr) Peak: 2,300 BTU/hr (560 kcal/hr) Leveling the Ice Machine 1.

  • Page 21: Electrical Requirements

    (Minimum circuit ampacity is not the ice machine’s running amp load.) Manitowoc’s recommended minimum wire size is #14 for less than 100’ or #12 for more than 100’ to 200’ (solid copper conductor only). The recommended breaker is 15 amp.

  • Page 22: Electrical Specifications

    Electrical Specifications Air-cooled Ice Machine Voltage Phase Max. Fuse/ Min. Circuit Ice Machine Cycle Circuit Breaker Ampacity UCP0050A 115/1/60 15 amp 4.1 amp NOTE: Model/serial plate information overrides all data listed in this chart. Power cord: 6 ft (182 cm), NEMA 5-15P plug Warning All wiring must conform to local and national codes.

  • Page 23: Water Service/Drains

    Water pressure must remain between 20 and 80 psig (14 to 55 bar). If water pressure exceeds the maximum recommended pressure (80 psi - 55 bar), obtain a water pressure regulator from your Manitowoc distributor. • Install a water shut-off valve for ice making potable water.

  • Page 24: Drain Pump Option

    DRAIN PUMP OPTION Disconnect power to ice machine before proceeding. 1. Remove top cover screws and slide cover off. Remove back panel screws and lift panel off. 2. Assemble the outlet tube and vent tube to the drain pump. 3. Plug the drain pump’s wire assembly into the ice machine’s wire assembly.

  • Page 25: Drain Connections

    DRAIN CONNECTIONS Follow these guidelines when installing drain lines to prevent drain water from flowing back into the ice machine and storage bin: • Drain lines must have a 1.5-inch drop per 5 feet of run (2.5 cm per meter), and must not create traps. •...
  • Page 26 Water Supply and Drain Line Sizing/Connections Part Number STH115 Rev 00 04/24...

  • Page 27: Maintenance

    The ice machine must be taken apart for descaling and sanitizing. Using non-Manitowoc descalers, sanitizers, cleaners or solutions may result in bodily harm and/or cause damage to the ice machine that is not covered under the warranty The ice machine must be taken apart for descaling and sanitizing.

  • Page 28: Descaling And Sanitizing Procedures

    Use only Manitowoc approved Ice Machine Metal Safe Descaler (000000084) and Sanitizer (9405653). Using a non Manitowoc descaler or sanitizer may result in bodily harm and/or cause damage to the ice machine that is not covered under the warranty. Do not use descaler or sanitizer quantities that exceed the amounts listed in this manual.

  • Page 29: Remedial Descaling Procedure

    Remedial Descaling Procedure This procedure allows monthly in place de-scaling of all surfaces that come in contact with the water system. The ice machine requires disassembly and de-scaling/sanitizing a minimum of once every 12 months. The quality of your potable water supply may require more frequent de-scaling intervals.
  • Page 30 NOTE: All ice must be removed from the bin. Prepare 4 oz (1/2 cup) of undiluted Manitowoc Step 1 Ice Machine Metal Safe De-scaler (part number 000000084 only) in a container that will fit easily under the lifted water shutters. Refer to “Component Identification”...
  • Page 31 Press the Clean button. Wait 3 minutes until Step 7 the Clean light flashes, then add the prepared Manitowoc Sanitizer by lifting the water shutters and pouring directly into the spray area. The ice machine will automatically time out a ten minute sanitizing cycle, followed by eight rinse cycles, and stop.

  • Page 32: De-Scaling Procedure

    When the de-scaling process stops, disconnect Step 5 power and remove all parts as described in Removal of Parts for De-scaling and Sanitizing. Mix 16 oz (2 cups) Manitowoc Metal Safe De- Step 6 scaler with 2 gal of warm water. Amount of Metal Safe...
  • Page 33 Use 1/2 of the Manitowoc Metal Safe De- scaler/water mixture to de-scale all components. The metal safe de-scaler solution will foam when it contacts lime scale and mineral deposits; once the foaming stops, use a soft-bristle nylon brush, sponge or cloth (NOT a wire brush) to carefully de-scale the parts.
  • Page 34 Reapply power to the ice machine, then press Step 14 the Clean button. Wait 3 minutes until the Clean light flashes, then add the prepared Manitowoc Sanitizer by lifting the water shutters and pouring directly into the spray area. The ice machine will automatically time out...

  • Page 35: Removal Of Parts For De-Scaling/Sanitizing

    Removal of Parts for De-scaling/Sanitizing 1. Turn off the electrical and water supply to the ice machine. Warning Disconnect electric power to the ice machine before proceeding with any of the following procedures. 2. Remove all ice from the bin. 3.
  • Page 36 9. Use the sanitizing solution and a sponge or cloth to sanitize (wipe) the interior of the ice machine and bin. 10. Rinsing is not required when using Manitowoc Sanitizer. 11. Install the removed parts.

  • Page 37: Top Cover

    TOP COVER 1. Disconnect power to the ice machine. 2. Remove two back screws. 3. Slide top cover backward slightly and lift cover off. FRONT GRILL 1. Remove two screws. 2. Tilt top forward and lift. Part Number STH115 Rev 00 04/24...
  • Page 38 WATER SHUTTERS The water shutter is designed to keep the spraying water from escaping the evaporator compartment. TO REMOVE JUST THE WATER SHUTTERS: 1. Grasp one end of the water shutter and lift up. 2. Pivot water shutter and disengage remaining end. 3.
  • Page 39 Ice Chute The ice chute is positioned over the spray nozzles and allows the ice to easily fall into the bin. It must be firmly positioned over the spray bar, with the front edge inside the water trough. Spray nozzles must be align with the spray holes or spray water will fall into the bin.

  • Page 40: Sump Drain Overflow Tube

    SUMP DRAIN OVERFLOW TUBE 1. Remove clamp. 2. Pull down to remove overflow tube and tubing as an assembly. The sump trough water will drain into the bin. 3. Remove overflow tube from vinyl tubing by pulling. Water Trough 1. Depress tabs on right and left side of the water trough.
  • Page 41 Spray Bar, Water Pump and Hose 1. Remove spray bar clamp and spray bar. 2. Remove the 5/16” water pump mounting screw. 3. Grasp pump and pull straight down until water pump disengages and electrical connector is visible. 4. Disconnect the electrical connector. 5.
  • Page 42 Spray Bar Disassembly The spray bar supplies water to the individual ice making cups. Water from the water pump sprays through the nozzles, located on the upper portion of the tubes. 1. Grasp one end of the spray bar, lift up and remove from seat formed in evaporator bucket.
  • Page 43 Bin Light If the ice machine is shut down for a long period of time the bin light cover must be de-scaled and sanitized. The light is provided for your convenience. If you experience operational problems with the light a replacement appliance bulb can be obtained from your local hardware store.

  • Page 44: Ice Machine Inspection

    ICE MACHINE INSPECTION Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc. Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.

  • Page 45: Removal From Service/Long Term Storage/Winterization

    Removal from Service/Long Term Storage/ Winterization 1. Perform a de-scaling and sanitizing procedure to prevent mildew growth. 2. Disconnect the electric power at the circuit breaker or the electric service switch. 3. Turn off the water supply. 4. Remove the water from the water trough. 5.
  • Page 46 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...

  • Page 47: Operation

    Operation Ice Making Sequence of Operation Replace Water Filter Delay Power Clean Start Automatic To reset: Push and hold Clean button Hours for 6 seconds. Making FUNCTIONS Power Button (Green) Pressing the “Power” button once will “power on” the ice machine and green Power light. Pressing the “Power” button a second time will “power off”...
  • Page 48 Clean (Green) Pressing the “CLEAN” button will initiate a clean cycle and de-energize the “Automatic Ice Making” light. The clean light will flash during the clean cycle to indicate the proper time to add ice machine metal safe cleaner/de-scaler or sanitizer.
  • Page 49 Canceling a 24 hour delay period • Press the power button while a delay period is active. • Follow “Repeat Delay Period every 24 Hours” to step 5. • Disconnect/reconnect the main power supply Part Number STH115 Rev 00 04/24...

  • Page 50: Operational Checks

    Operational Checks Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do not require any adjustment. To ensure proper operation, always follow the Operational Checks: • when starting the ice machine for the first time • after a prolonged out of service period •...

  • Page 51: Sequence Of Operation

    Sequence of Operation Depending on ambient conditions and cold water supply temperature, the ice making process will take approximately 30 minutes. Step 1 Initial Start-Up or Start-Up After Automatic Shut- Off — Water Fill Before the compressor starts, the water inlet valve will energize to purge old water from the system for about 3 minutes.

  • Page 52: Safety Timers

    SAFETY TIMERS The control board has the following non-adjustable safety timers: • Initial cycle is 5 minutes longer than subsequent cycles. • The ice machine is locked into the freeze cycle for 10 minutes (15 minutes initial cycle) before a harvest cycle can be initiated.
  • Page 53 Part Number STH115 Rev 00 04/24...
  • Page 54 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...

  • Page 55: Troubleshooting

    Troubleshooting PROBLEM CHECKLIST Problem Possible Cause Correction Replace the fuse/reset the No electrical power to breaker/turn on the main Ice machine does the ice machine. switch/plug power cord into receptacle. not operate. Ice machine needs to Press the On/Off button to be turned on.
  • Page 56 SERVICE LIMIT FEATURE In addition to the standard safety controls, such as the high pressure cutout, your Manitowoc ice machine features built-in Service Limits, which will stop the ice machine if conditions arise which could cause a major component failure.

  • Page 57: Diagnosing An Ice Machine That Will Not Run

    DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board at all times. 1. Verify primary voltage is supplied to ice machine. 2. Verify that the fuse or circuit breaker is closed and the ice machine is plugged into a receptacle.
  • Page 58 DIAGNOSING AN ICE MACHINE THAT DOES NOT CYCLE INTO HARVEST OR WILL NOT RELEASE THE ICE 1. Verify cubes are present in evaporator and freeze time exceeds freeze chart cycle time. • Initial freeze cycle after resetting at toggle switch will be 5 minutes longer than chart time (refer to “Sequence of Operation”).
  • Page 59 4. Verify the water inlet valve is energized during the entire harvest cycle and water flow is normal. • Although the hot gas valve is energized, the ice machine will not consistently harvest if the water inlet valve does not energize or has low water flow.

  • Page 60: Ice Quality Is Poor - Cubes Are Shallow, Incomplete, Or White

    ICE QUALITY IS POOR - CUBES ARE SHALLOW, INCOMPLETE, OR WHITE Ice machine is dirty • Clean and sanitize the ice machine Water filtration is poor Water filtration is poor • Replace the filter Water softener is working improperly (if applicable) •...

  • Page 61: Freeze Cycle Is Long, Low Ice Production

    FREEZE CYCLE IS LONG, LOW ICE PRODUCTION Water temperature is too high • Connect to a cold water supply, verify check valves in faucets and other equipment are functioning correctly Dirty Condenser • Clean condenser High air temperature entering condenser •...

  • Page 62: Ice Machine Runs And No Ice Is Produced

    ICE MACHINE RUNS AND NO ICE IS PRODUCED No water to ice machine • Correct water supply Incorrect incoming water pressure • Water pressure must be 20-80 psi (1.4-5.5 bar) Spray nozzle is blocked with mineral buildup • Clean and sanitize the ice machine Ambient temperature is too high or low •...

  • Page 63: Installation/Visual Inspection Checklist

    ELIMINATE ALL NON REFRIGERATION PROBLEMS BEFORE DIAGNOSING THE REFRIGERATION SYSTEM. • Perform a visual inspection for clearances, drains, dirty condenser/filter and water filter replacement. • Verify water spray is even across the entire evaporator. • Run an ice production check - Ice production checks within 10% are considered normal.

  • Page 64: Water System Checklist

    WATER SYSTEM CHECKLIST A water-related problem often causes the same symptoms as a refrigeration system component malfunction. Example: Water loss during the freeze cycle, a system low on charge, and a restricted TXV have similar symptoms. Water system problems must be identified and eliminated prior to replacing refrigeration components.

  • Page 65: Analyzing Discharge Pressures

    Analyzing Discharge Pressures 1. Determine the ice machine operating conditions: • Air temp. entering condenser ______ • Air temp. around ice machine ______ • Water temp. entering sump trough ______ 2. Refer to “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts”...

  • Page 66: Discharge Pressure High Checklist

    • Overcharged • Non-condensible in system • Wrong type of refrigerant Other • Non-Manitowoc components in system • High side refrigerant lines/component restricted (before mid-condenser) Freeze Cycle Discharge Pressure Low Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist”...

  • Page 67: Analyzing Suction Pressure

    Analyzing Suction Pressure The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction pressure drop throughout the freeze cycle, compare the published suction pressure to the published freeze cycle time.
  • Page 68 Perform an actual suction pressure check at the beginning, middle and end of the freeze cycle. Note the times at which the readings are taken. Example: Manifold gauges were connected to the example ice machine and suction pressure readings taken as follows: ________ psig Beginning of Freeze cycle: 30 (at 1 min.) Middle of freeze cycle: 22 (at 10 min.)

  • Page 69: Suction Pressure High Checklist

    Checklist” on page 150. Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensible in system Other • Non-Manitowoc components in system • Hot gas valve leaking • Defective compressor • Water inlet valve leaking Part Number STH115 Rev 00 04/24...

  • Page 70: Suction Pressure Low Checklist

    Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Manitowoc components in system • Improper water supply over evaporator refer to “Water System Checklist” • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 71: Freeze Cycle Analysis Chart

    Part Number STH115 Rev 00 04/24...

  • Page 72: Hot Gas Valve

    Hot Gas Valve GENERAL The hot gas valve is an electrically operated valve that opens when energized, and closes when de-energized. NORMAL OPERATION The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the receiver and the evaporator and performs two functions: 1.
  • Page 73 Hot Gas Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. VALVE WILL NOT OPEN IN THE HARVEST CYCLE Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
  • Page 74 Warning The inlet of the hot gas valve and the compressor discharge line could be hot enough to burn your hand. Just touch them momentarily. 4. Compare the temperature of the inlet of the hot gas valves to the temperature of the compressor discharge line.

  • Page 75: Ice Production Check

    Ice Production Check ICE CUBE PATTERN Ice cube formation is helpful in ice machine diagnostics. Analyzing the ice formation alone cannot diagnose an ice machine malfunction. However, when this analysis is used along with the “TXV Failure/Low Refrigerant Charge Symptoms” on page 81, it can help diagnose an ice machine malfunction.
  • Page 76 Extremely Thin at Evaporator Inlet There is no ice, or a considerable lack of ice formation at the inlet of the evaporator. Examples: The ice at the outlet of the evaporator reaches the correct thickness, but there is no ice formation at all at the inlet of the evaporator. Possible cause: Obstructed nozzles, Insufficient water flow, incorrect refrigerant charge.
  • Page 77 ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21°C) ambient temperature and 50°F (10°C) water produces more ice than the same ice machine with 90°F (32°C) ambient and 70°F (21°C) water.
  • Page 78 3. Perform an ice production check using the formula below. Freeze Harvest Time Total Cycle Time Time 1440 ÷ Minutes in Total Cycle Cycles per Day 24 Hrs. Time Weight Cycles per Actual 24-Hour of One Production Harvest Weighing the ice is the only 100% accurate check. 4.
  • Page 79 ADJUSTING CUBE WEIGHT The cube weight can be increased from the factory setting by adjusting the finish time. ADDITIONAL FINISHING TIME CHECK Press and hold the power button for 5 seconds. light. • Count the flashes on the Automatic Ice Making The light will flash once for each additional minute of freeze cycle time.
  • Page 80 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...

  • Page 81: Component Check Procedures

    Component Check Procedures Main Fuse Warning Disconnect electrical power to the entire ice machine before proceeding. Function The control board fuse stops ice machine operation if electrical components fail causing high amp draw. Specifications The main fuse is 250 Volt, 10 amp. Check Procedure 1.

  • Page 82: Bin Thermistor

    Bin Thermistor Function The bin thermostat stops the ice machine when the bin is full. It is preset for normal ambient temperatures and adjustments are usually not required. The level of ice in the ice storage bin controls the ice machine shut-off.
  • Page 83 Adjustment Warning Power is supplied to ice machine during this procedure. Avoid contact with the fan blade and electrical connections. If the ice machine stops before the bin is full or runs after the bin is full, ambient temperatures are probably high or low and the bin thermostat can be adjusted as follows: 1.

  • Page 84: Check Procedure

    CHECK PROCEDURE Warning High (line) voltage is applied to the control board (terminals #20 and #21) at all times. Removing the control board fuse or depressing the power button will not remove the power supplied to the control board. Warning Disconnect electrical power to the entire ice machine before proceeding.

  • Page 85: Liquid Line Thermistor

    10,000 Ohms ± 2% at 25°C (77°F) CHECK PROCEDURE Thermistors generally fail because of moisture or physical damage. Manitowoc liquid line thermistors are encased in a specially designed, moisture-sealed aluminum block. This eliminates physical damage and moisture concerns. Verify that the thermistor resistance is accurate and corresponds to the high and low temperature ranges.
  • Page 86 3. With the ice machine running, verify that the temperature of the discharge line (step 2) corresponds to the thermistor resistance reading (step 1) as stated in the temperature/resistant chart. Important If the thermistor would fail closed, the light on the control board will flash rapidly.

  • Page 87: Temperature/Resistance Chart

    Temperature/Resistance Chart As the temperature rises at the thermistor block, the resistance drops. Important If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad. Temperature of Thermistor Resistance °C °F K Ohms (x 1000) 15.6°...

  • Page 88: Fan Cycle Control

    Fan Cycle Control Function Cycles the fan motor on and off to maintain proper operating discharge pressure. The fan cycle control closes on an increase, and opens on a decrease in discharge pressure. Specifications Cut-In (Close) Cut-Out (Open) 140 psig 110 psig Check Procedure 1.

  • Page 89: Compressor Electrical Diagnostics

    Compressor Electrical Diagnostics The compressor does not start or will trip repeatedly on overload. Check Resistance (Ohm) Values NOTE: Compressor windings can have very low ohm values. Use a properly calibrated meter. Perform the resistance test after the compressor cools. The compressor dome should be cool enough to touch (below 120°F/49°C) to ensure that the overload is closed and the resistance readings will be accurate.
  • Page 90 Compressor Drawing Locked Rotor The two likely causes of this are: • Defective starting component • Mechanically seized compressor To determine which you have: 1. Install high and low side gauge. 2. Try to start the compressor. 3. Watch the pressures closely. •...

  • Page 91: Filter-Driers

    Liquid Line Filter Drier The filter-drier used on Manitowoc ice machines are manufactured to Manitowoc specifications. The difference between a Manitowoc drier and an off- the-shelf drier is in filtration. A Manitowoc drier has dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends.

  • Page 92: Refrigerant Procedures

    Refrigerant Procedures SERVICING REQUIREMENTS • It is recommended that only technicians specifically trained in handling flammable refrigerants, service or dispose of equipment containing hydrocarbon refrigerants. • Color-coded red process tubes indicate use of a flammable refrigerant - Process tubes must be replaced after brazing or other service procedures.
  • Page 93 REFRIGERANT PURGING REQUIREMENTS NOTE: Country and Local Codes for removal and processing of this refrigerant must always take precedence over these procedures. • Minimum of 10 feet from building, verify wind direction will not introduce refrigerant into building. • Verify refrigerant does not enter buildings through intake air vents.

  • Page 94: Brazing Procedure

    REFRIGERANT PURGING PROCEDURE 1. Disconnect all electric power to the system and lockout tag out the power source(s). NOTE: Some systems may have more than one power supply. 2. Work in well-ventilated, open space and eliminate all ignition sources. 3. Install piercing valves on the high and low side access fittings.

  • Page 95: Pressure Testing

    PRESSURE TESTING 11. Pressure test with dry nitrogen to detect leaks. Use nitrogen and a trace amount of refrigerant to locate the leak if a pressure test indicates a leak is present. 12. Do not over pressurize the system. Check the name plate for the maximum test pressure.

  • Page 96: Refrigerant Charging

    Important The charge is critical on all Manitowoc ice machines. Use a scale to ensure the proper charge is installed. A quick disconnect is required for the high side connection.
  • Page 97 NOTE: Manifold gauge set must be removed properly to ensure no refrigerant contamination or loss occurs. 5. Verify all of the vapor in the charging hoses is drawn into the refrigeration system before disconnecting the charging hoses. Run the ice machine in freeze cycle. Remove the high side low loss fitting.

  • Page 98: System Contamination Cleanup

    System Contamination Cleanup This section describes the basic requirements for restoring contaminated systems to reliable service. DETERMINING SEVERITY OF CONTAMINATION System contamination is generally caused by either moisture or residue from compressor burnout entering the refrigeration system. Inspection of the refrigerant usually provides the first indication of system contamination.
  • Page 99 Contamination/Cleanup Chart Symptoms/Findings Required Cleanup Procedure No symptoms or suspicion of Normal evacuation/ contamination recharging procedure Moisture/Air Contamination symptoms Mild contamination Refrigeration system open to atmosphere cleanup procedure for longer than 15 minutes Refrigeration test kit and/or acid oil test shows contamination No burnout deposits in open compressor lines...

  • Page 100: Mild System Contamination Cleanup Procedure

    MILD SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Replace any failed components. 2. If the compressor is good, change the oil. 3. Replace the liquid line drier. NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evaporator prior to evacuation.

  • Page 101: Severe System Contamination Cleanup Procedure

    SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Remove the refrigerant charge. 2. Remove the compressor. 3. If burnout deposits are found, replace the TXV. 4. Wipe away any burnout deposits from suction and discharge lines at compressor. 5. Sweep through the open system with dry nitrogen. 6.

  • Page 102: Total System Refrigerant Charge

    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. If the pressure drop is less than 2 psig, the filter- drier should be adequate for complete cleanup.

  • Page 103: Cycle Times, 24 Hr . Ice Production And Refrigerant

    Charts Cycle Times, 24 Hr. Ice Production and Refrigerant Temperature Charts These charts are used as guidelines to verify correct ice machine operation. • Accurate collection of data is essential to obtain the correct diagnosis. Eliminate all non refrigeration problems before diagnosing the refrigeration system. •...
  • Page 104 USE0050A AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Water Temperature Temperature Harvest Entering 50oF 70oF 90oF Time Condenser 10oC 21oC 32oC oF / oC 70oF/ 15.6-17.8 15.3-17.4 15.6-17.8 21oC...
  • Page 105 Operating Pressures - Freeze Cycle Temperature DISCHARGE SUCTION Entering PRESSURE PRESSURE Condenser oF / oC 50oF/ 125-70 psig 18-0 psig 10oC 8.62-4.83 bar 1.24-0 bar 70oF/ 135-95 psig 18-0 psig 21oC 9.31-6.55 bar 1.24-0 bar 80oF/ 165-115 psig 19-2 psig 27oC 11.38-7.93 bar 1.31-0.14 bar...
  • Page 106 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH115 Rev 00 04/24...

  • Page 107: Wiring Diagram

    Diagrams Wiring Diagram Part Number STH115 Rev 00 04/24...

  • Page 108: Tubing Schematic

    Tubing Schematic Part Number STH115 Rev 00 04/24...
  • Page 110 MANITOWOC ICE 2110 SOUTH 26TH STREET MANITOWOC, WI 54220 800-545-5720 WWW.MANITOWOCICE.COM ©2024 Manitowoc Ice except where explicitly stated otherwise. All rights reserved. Part Number STH115 Rev 00 04/24...