Manitowoc STH042 4/16 Technician's Handbook
  1. Manuals
  2. Brands
  3. Manitowoc Manuals
  4. Ice Maker
  5. STH042 4/16
  6. Technician's handbook

Manitowoc STH042 4/16 Technician's Handbook

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Undercounter Ice Machines
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 STH042 4/16

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the STH042 4/16 and is the answer not in the manual?

Questions and answers

Related Manuals for Manitowoc STH042 4/16

Summary of Contents for Manitowoc STH042 4/16

  • Page 1 Undercounter Ice Machines 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 STH042 4/16...

  • 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 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 5 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 6 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 7 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 8 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...

  • Page 9: Table Of Contents

    Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Part Number STH042 4/16...
  • Page 10 Ice Thickness Adjustment . . . . . . . . . . . . . . . . . . 54 Minimum/Maximum Slab weight . . . . . . . . . . 55 Part Number STH042 4/16...
  • Page 11 Discharge Line Temperature Analysis . . . . . . . . . 89 Refrigeration Component Diagnostics . . . . . . . . 91 Refrigeration Component Diagnostic Chart . . 94 Part Number STH042 4/16...
  • Page 12 Removing Refrigerant Charge . . . . . . . . . . . . . 123 Total System Refrigerant Charge . . . . . . . . . . . . . 125 Part Number STH042 4/16...
  • Page 13 Tubing Schematic - U0140 . . . . . . . . . . . . . . . . . . . 143 Tubing Schematic - U0190/U0240/U0310 . . . . 143 Part Number STH042 4/16...
  • Page 14 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...

  • Page 15: General Information

    UD0190A – UD0190AE – UY0190A – UY0190AE – UR0190A – UR0190AE – UD0240A UD0240W UD0240AE UD0240WE UY0240A UY0240W UY0240AE UY0240WE UR0240A – UR0240AE – UD0310A UD0310W UD0310AE UD0310WE UY0310A UY0310W UY0310AE UY0310WE UR0310A – UR0310AE – Part Number STH042 4/16...

  • Page 16: How To Read A Model Number

    Y - Half-dice Warning An ice machine contains high voltage electricity and refrigerant charge. Repairs are to be performed by properly trained refrigeration technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure. Part Number STH042 4/16...

  • Page 17: Ice Machine Warranty Information

    Ice Machine Warranty Information For warranty information visit: http://www.kool-aire.com/Service/Warranty • Warranty Verification • Warranty Registration • View and download a copy of the warranty Owner Warranty Registration Card Warranty coverage begins the day the ice machine is installed. Part Number STH042 4/16...

  • Page 18: 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 19: Ice Machine Clearance Requirements

    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 installed. Part Number STH042 4/16...

  • Page 20: Leveling The Ice Machine

    Turn each foot as necessary to level the ice machine from front to back and side to side. THREAD LEVELING LEG INTO BASE OF CABINET THREAD “FOOT” IN AS FAR AS POSSIBLE SV1606 Leg Installation Part Number STH042 4/16...

  • Page 21: Electrical Requirements

    The total circuit ampacity is used to help select the wire size of the electrical supply. 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. Part Number STH042 4/16...

  • Page 22: Electrical Specifications

    Electrical Specifications Air-cooled Ice Machine Max. Fuse/ Voltage Ice Machine Circuit Total Amps Phase Cycle Breaker 115/1/60 U140 208-230/1/60 230/1/50 115/1/60 U190 208-230/1/60 230/1/50 115/1/60 U240 208-230/1/60 230/1/50 115/1/60 10.0 U310 208-230/1/60 230/1/50 Part Number STH042 4/16...
  • Page 23 230/1/50 115/1/60 U240 208-230/1/60 230/1/50 115/1/60 10.0 U310 208-230/1/60 230/1/50 Warning All wiring must conform to local, state and national codes. Warning The ice machine must be grounded in accordance with national and local electrical code. Part Number STH042 4/16...

  • Page 24: Water Service/Drains

    Important If you are installing a Manitowoc water filter system, refer to the Installation Instructions supplied with the filter system for ice making water inlet connections. Warning For ice making, connect to a potable water supply only.

  • Page 25: Drain Connections

    Allow for a pressure drop of 7 psig (.48 bar) between the condenser water inlet and the outlet of the ice machine. • Water exiting the condenser must not exceed 110°F (43.3°C). Caution Plumbing must conform to state and local codes. Part Number STH042 4/16...

  • Page 26: Water Supply And Drain Line Sizing

    WATER SUPPLY AND DRAIN LINE SIZING/ CONNECTIONS Part Number STH042 4/16...

  • Page 27: Interior Cleaning And Sanitizing

    The ice machine must be taken apart for cleaning and sanitizing. Caution Use only Manitowoc approved Ice Machine Cleaner and Sanitizer. It 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.

  • Page 28: Touch Pad Operation

    Never use anything to force ice from the evaporator. Damage may result. Step 2 Remove all ice from the bin. Warning Wear rubber gloves and safety goggles (and/or face shield) when handling Ice Machine Cleaner or Sanitizer. Part Number STH042 4/16...
  • Page 29 On/Off button and disconnect power and water supplies to the ice machine. Step 4 Remove parts for cleaning. Refer to the proper parts removal for your machine. Continue with step 5 when the parts have been removed. Part Number STH042 4/16...
  • Page 30 Use a nylon brush or cloth to thoroughly clean the following ice machine areas: • Evaporator plastic parts – including top, bottom and sides • Bin bottom, sides and top • Rinse all areas thoroughly with clean water. Part Number STH042 4/16...
  • Page 31 1 ounces (30 ml) U0190 2 ounces (60 ml) U0240 2 ounces (60 ml) U0310 2 ounces (60 ml) Wait until the sanitize cycle is complete (approximately 22 minutes) then press the Ice button to start ice making. Part Number STH042 4/16...

  • Page 32: Remove Parts For Cleaning

    The harvest float must be mounted to the side of the water trough and the electrical connection must be in the bottom bulkhead grommet. • The wire connectors for each float are different and will not allow incorrect electrical bulkhead connection. Part Number STH042 4/16...
  • Page 33 WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD PULL THROUGH GROMMET TO DISCONNECT HARVEST FLOAT ICE THICKNESS FLOAT SWITCH & BRACKET SWITCH & BRACKET DISCONNECT WIRES FOR COMPLETE REMOVAL Part Number STH042 4/16...
  • Page 34 While supporting the water trough remove the thumbscrew and thermistor. • While supporting the water trough remove the lower thumbscrew from beneath the water trough. • Remove the water trough from the bin area. UPPER THUMBSCREW LOWER THUMBSCREW Part Number STH042 4/16...
  • Page 35 Remove thumbscrew from bin switch cover. • Support ice damper and then pull bin switch cover and ice damper forward to remove. 1. REMOVE THUMBSCREW 2. SUPPORT ICE DAMPER THEN SLIDE RIGHT SIDE FORWARD TO REMOVE Part Number STH042 4/16...
  • Page 36 Loosen the two outer screws and pull forward on the distribution tube to release. NOTE: For ease of assembly when reinstalling the water distribution tube, install the top edge first. 1. LOOSEN THUMBSCREWS 2. PULL DISTRIBUTION TUBE FORWARD TO REMOVE Part Number STH042 4/16...

  • Page 37: Preventative Maintenance Cleaning

    Amount of Cleaner U0140 2 ounce (60 ml) U0190 5 ounces (150 ml) U0240 5 ounces (150 ml) U0310 5 ounces (150 ml) Wait until the clean cycle is complete (approximately 22 minutes) then press the On/Off button. Part Number STH042 4/16...

  • Page 38: Ice Machine Inspection

    Sponge any dust and dirt off the outside of the ice machine with mild soap and water. Wipe dry with a clean, soft cloth. Cleanup any fallen ice or water spills as they occur. Part Number STH042 4/16...

  • Page 39: Cleaning The Condenser

    The condenser fins are sharp. Use care when cleaning them. • Shine a flashlight through the condenser to check for dirt between the fins. • Blow compressed air or rinse with water from the inside out (opposite direction of airflow). Part Number STH042 4/16...

  • Page 40: Removal From Service/Winterization

    5. Press the On/Off button and disconnect the electric power at the circuit breaker or the electric service switch. 6. Fill spray bottle with sanitizer and spray all interior food zone surfaces. Do not rinse and allow to air dry. 7. Replace all panels. Part Number STH042 4/16...

  • Page 41: Bin Removal

    A watertight seal is required to prevent future condensation or water leakage from entering the ice machine base. DISCONNECT CLAMP AND REMOVE BIN DRAIN SCREWS AND PLATES DISCONNECT COMMUNICATION CABLE Part Number STH042 4/16...
  • Page 42 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...

  • Page 43: Operation

    NOTE: Stopping and restarting a freeze cycle with ice on the evaporator will result in a thick bridge and larger than normal cubes; or result in an ice slab that will not release from the evaporator. Part Number STH042 4/16...

  • Page 44: Delay

    • Pressing the control board test button anytime during the clean cycle will cancel the clean cycle. • Opening the damper for 30 seconds during the clean cycle will start and automatic shutdown sequence. Part Number STH042 4/16...

  • Page 45: Bin Full

    The Bin Full light energizes when the bin is full or is de- energized if the bin is not full. SERVICE The service light indicates the machine needs attention. • Refer to safety limits if this light is energized. Part Number STH042 4/16...

  • Page 46: Ice Making Sequence Of Operation

    WITHOUT WATER TROUGH THERMISTOR The following sequence occurs in the freeze cycle: • At 3.75 minutes the water pump de-energizes for 25 seconds, then re-energizes. • When the water pump restarts the water inlet solenoid energizes for 7 seconds. Part Number STH042 4/16...
  • Page 47 3.5 minutes. Full Bin Cycle If the ice damper is held open by ice cubes the ice machine shuts off. When the ice damper closes the ice machine starts a new cycle at the water purge. Part Number STH042 4/16...
  • Page 48 6. A freeze cycle starts. NOTE: If the bin switch opens & closes anytime during the cycle the ice machine starts a new freeze cycle. • The maximum water fill time for the water assist harvest is 105 seconds. Part Number STH042 4/16...

  • Page 49: Control Board Timers

    3 minutes into the freeze cycle. Control boards with firmware version 2.58 or larger • The control board will stop the ice machine for 25 seconds during the freeze cycle and then re-energize. Part Number STH042 4/16...

  • Page 50: Safety Limits

    • The control board automatically initiates a freeze sequence when the thaw cycle(s) is complete. • If 3 consecutive 7 minute harvest/thaw cycles occur, the ice machine stops. Part Number STH042 4/16...
  • Page 51 The ice machine automatically restarts at the end of the 30 minute delay period and stops flashing the control board and Service (wrench) lights. • If 100 consecutive failures occur the ice machine stops and the touch pad Service (wrench) light remains energized. Part Number STH042 4/16...

  • Page 52: Energized Parts Chart

    Part Number STH042 4/16...
  • Page 53 Part Number STH042 4/16...

  • Page 54: Operational Checks

    2. Slide the bracket over the desired tab and release. • The center position is the normal factory setting. • To increase bridge thickness, raise the water level. • To decrease bridge thickness, lower the water level. THICKER THINNER FACTORY BRIDGE BRIDGE DEFAULT Part Number STH042 4/16...

  • Page 55: Minimum/Maximum Slab Weight

    U140 1.13 lbs 1.36 lbs 513 grams 617 grams U190 2.26 lbs 2.93 lbs 1025 grams 1329 grams U240 2.26 lbs 2.93 lbs 1025 grams 1329 grams U310 2.26 lbs 2.93 lbs 1025 grams 1329 grams Part Number STH042 4/16...
  • Page 56 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...

  • Page 57: Troubleshooting

    Harvest float switch Connect the wire harvest mode. wire is disconnected. Harvest float switch is Adjust the harvest float out of adjustment. switch. Uneven ice fill (thin at Refer to “Shallow or top of evaporator). Incomplete Cubes” Part Number STH042 4/16...
  • Page 58 Long harvest cycles Clean the ice machine with repeated safety & perform diagnostic limit indication procedures as required Part Number STH042 4/16...

  • Page 59: Control Board Test Mode

    The touch pad is attached to the bin and is disconnected during the removal process. Use the control board test mode to operate the ice machine without connecting the touch pad. Part Number STH042 4/16...

  • Page 60: Diagnosing An Ice Machine That Will Not Run

    Refer to page 98 touch pad diagnostics when Steps 1 –3 test good. 5. Be sure Steps 1 – 4 were followed thoroughly. Intermittent problems are not usually related to the control board. Replace control board if touch pad operation is correct. Part Number STH042 4/16...

  • Page 61: Ice Machine Does Not Cycle Into Harvest When

    Refer to Float Switch the ice machine cycles from freeze Diagnostics. to harvest and the control board harvest light energizes. The harvest light stays off and the Proceed to Step 3 ice machine remains in freeze. Part Number STH042 4/16...
  • Page 62 The ice machine is in a 6 ice machine remains in the freeze minute freeze lock - Cycle cycle. on/off and retest. The harvest light stays off and the Replace the control ice machine remains in freeze. board. Part Number STH042 4/16...

  • Page 63: Water Loses Contact With The Harvest Float

    WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD PULL THROUGH GROMMET TO DISCONNECT HARVEST FLOAT ICE THICKNESS FLOAT SWITCH & BRACKET SWITCH & BRACKET Part Number STH042 4/16...
  • Page 64 - Cycle sequence. on/off and retest. 10 seconds into the freeze cycle Replace the control the ice machine cycles from freeze board. to harvest and the control board harvest light energizes. Part Number STH042 4/16...

  • Page 65: Ice Production Check

    3. Perform an ice production check using the formula below. Freeze Harvest Total Cycle Time Time Time 1440 ÷ Minutes Total Cycle Cycles per in 24 Hrs. Time Weight Cycles per Actual of One 24-Hour Harvest Production Part Number STH042 4/16...
  • Page 66 If they match closely, determine if: • Another larger ice machine is required. • Relocating the existing equipment to lower the load conditions is required. Contact the local Manitowoc distributor for information on available options and accessories. Part Number STH042 4/16...

  • Page 67: Installation/Visual Inspection Checklist

    • Clean the condenser Water filtration is plugged (if used) • Install a new water filter Water drains are not run separately and/or are not vented • Run and vent drains according to the Installation Manual Part Number STH042 4/16...

  • Page 68: Water System Checklist

    Uneven water flow across the evaporator • Clean the ice machine Water is freezing behind the evaporator • Correct the water flow Plastic extrusions and gaskets are not secured to the evaporator • Remount/replace as needed Part Number STH042 4/16...

  • Page 69: Ice Formation Pattern

    Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. Analyzing the ice formation pattern alone cannot diagnose an ice machine malfunction. However, when this analysis is used along with Manitowoc’s Refrigeration System Operational Analysis Table, it can help diagnose an ice machine malfunction. OUTLET...
  • Page 70 No Ice Formation The ice machine operates for an extended period, but there is no ice formation at all on the evaporator. Possible cause: Water float valve, water pump, starving expansion valve, low refrigerant charge, compressor, etc. Part Number STH042 4/16...

  • Page 71: Safety Limit Feature

    Safety Limit Feature In addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure. Service Light: The Service light energizes whenever a safety limit has been exceeded.
  • Page 72 The ice machine automatically restarts at the end of the 30 minute delay period and stops flashing the control board and Service (wrench) lights. • If 100 consecutive failures occur the ice machine stops and the touch pad Service (wrench) light remains energized. Part Number STH042 4/16...
  • Page 73 The control board will store and indicate only one safety limit – the last one exceeded. • If the power button is cycled OFF and then ON prior to reaching the 100-harvest point, the last safety limit exceeded will be indicated. Part Number STH042 4/16...
  • Page 74 High inlet air temperature (110°F/43.3°C max.) • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan cycling control • Defective fan motor • Low water pressure (20 psig min.) • High water temperature (90°F/32.2°C max.) • Dirty condenser Part Number STH042 4/16...
  • Page 75 Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensible in refrigeration system • Plugged or restricted high side refrigerant lines or component • Defective harvest valve Part Number STH042 4/16...

  • Page 76: Refrigeration System

    • Water inlet valve defective • Bin switch defective • Premature harvest Refrigeration system • Non-Manitowoc components • Improper refrigerant charge • Defective harvest valve • TXV flooding (check bulb mounting) • Defective fan cycling control Part Number STH042 4/16...
  • Page 77 Low water pressure (20 psig min.) • Dirty defective water filter (when used) • Loss of water from sump area • Dirty/defective water inlet valve Electrical system • Water inlet valve coil defective • Low water float valve defective Part Number STH042 4/16...

  • Page 78: Analyzing Discharge Pressure

    It is normal for the discharge pressure to be higher at the beginning of the freeze cycle (when load is greatest), then drop through out the freeze cycle. Part Number STH042 4/16...
  • Page 79 Wrong type of refrigerant Other • Non-Manitowoc components in system • High side refrigerant lines/component restricted (before mid-condenser) • Defective fan cycle control NOTE: Do not limit your diagnosis to only the items listed in the checklists. Part Number STH042 4/16...

  • Page 80: Analyzing Suction Pressure

    NOTE: Analyze discharge pressure before analyzing suction pressure. High or low discharge pressure may be causing high or low suction pressure. Part Number STH042 4/16...
  • Page 81 In this example, the suction pressure is considered high throughout the freeze cycle. It should have been: Approximately 65 psig (at 1 minute) – not 79 Approximately 39 psig (at 7 minutes) – not 48 Approximately 26 psig (at 14 minutes) – not 40 Part Number STH042 4/16...
  • Page 82 Checklist” on page 79. Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensable in system Other • Non-Manitowoc components in system • Harvest valve leaking • TXV flooding (check bulb mounting) • Defective compressor Part Number STH042 4/16...
  • Page 83 Loss of heat transfer from tubing on back side of evaporator • Restricted/plugged liquid line drier • Restricted/plugged tubing in suction side of refrigeration system • TXV starving NOTE: Do not limit your diagnosis to only the items listed in the checklists. Part Number STH042 4/16...

  • Page 84: Harvest Valve

    Exact pressures vary according to ambient temperature and ice machine model. Harvest pressures can be found in the Cycle Time/24 Hour Ice Production/ Refrigerant Pressure Charts in this book. Part Number STH042 4/16...
  • Page 85 As the amount of leakage increases the length of the freeze cycle increases and the amount of ice at the outlet of the evaporator decreases. Refer to the Parts Manual for proper valve application. If replacement is necessary, use only “original” Manitowoc replacement parts. Part Number STH042 4/16...
  • Page 86 The inlet of the harvest 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 harvest valves to the temperature of the compressor discharge line. Part Number STH042 4/16...
  • Page 87 This is not caused by a harvest valve leaking. Cool & Cool 5. Record your findings on the table. Part Number STH042 4/16...

  • Page 88: Comparing Evaporator Inlet/Outlet

    The temperatures of the suction lines entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle, along with using Manitowoc’s Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.

  • Page 89: Discharge Line Temperature Analysis

    Connect a temperature probe on the compressor discharge line within 6" (15.2 cm) of the compressor. Observe the discharge line temperature for the last three minutes of the freeze cycle and record the maximum discharge line temperature. Part Number STH042 4/16...
  • Page 90 Verify the expansion valve sensing bulb is 100% insulated and sealed airtight. Condenser air contacting an incorrectly insulated sensing bulb will cause overfeeding of the expansion valve. Part Number STH042 4/16...

  • Page 91: Refrigeration Component Diagnostics

    The tables list four different defects that may affect the ice machine’s operation. NOTE: A low-on-charge ice machine and a starving expansion valve have very similar characteristics and are listed under the same column. Part Number STH042 4/16...
  • Page 92 Note the column number with the highest total and proceed to “Final Analysis. ” NOTE: If two columns have matching high numbers, a procedure was not performed properly and/or supporting material was not analyzed correctly. Part Number STH042 4/16...
  • Page 93 Column 4 – Compressor Replace the compressor and start components. To receive warranty credit, the compressor ports must be properly sealed by crimping and soldering them closed. Old start components must be returned with the faulty compressor. Part Number STH042 4/16...

  • Page 94: Refrigeration Component Diagnostic Chart

    Part Number STH042 4/16...
  • Page 95 Part Number STH042 4/16...
  • Page 96 Part Number STH042 4/16...
  • Page 97 Part Number STH042 4/16...
  • Page 98 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...

  • Page 99: Component Check Procedures

    Warning Disconnect electrical power to the entire ice machine before proceeding. 2. Remove the fuse. Check the resistance across the fuse with an ohmmeter. Reading Result Open (OL) Replace fuse Closed (O) Fuse is good Part Number STH042 4/16...

  • Page 100: Bin Switch

    The bin switch must close. The curtain light “on” indicates the bin switch has closed properly. 4. Move the ice damper away from the evaporator. The bin switch must open. The curtain light “off” indicates the bin switch has opened properly. Part Number STH042 4/16...
  • Page 101 Always use the water curtain magnet to cycle the switch (a larger or smaller magnet will affect switch operation). • Watch for consistent readings when the bin switch is cycled open and closed (bin switch failure could be erratic). Part Number STH042 4/16...

  • Page 102: Touch Pad

    If the second test doesn’t show normal function, perform the Ohm test to verify the issue is not a wiring or control board issue. Part Number STH042 4/16...
  • Page 103 #3 & #7 Clean #4 & #7 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 TOUCH ELECTRCAL PROBE TO THESE LOCATONS ONLY DO NOT NSERT N END OF CONNECTOR Control Board Connector Part Number STH042 4/16...

  • Page 104: Float Switch

    2. Attach an ohm meter lead to each float switch wire. 3. Place the float in the down position - The float switch must be closed. 4. Place the float in the up position - The float switch must be open. Part Number STH042 4/16...
  • Page 105 FLOAT OPEN FLOAT CLOSED NOTE: Make adjustments with the ice machine in the off position. Making adjustments during the freeze cycle may produce an initial sheet of ice that is thicker than future cycles. Part Number STH042 4/16...

  • Page 106: Water Trough Thermistor

    1. Disconnect thermistor from control board - The control board thermistor LED will flash 1 second on and 1 second off. 2. The control board will default to the 3.75 minute pump delay in the freeze cycle. Part Number STH042 4/16...
  • Page 107 105 - 115 52.21 - 42.02 NOTE: The control board will default to a 3.75 minute pump delay in the freeze cycle, whenever the thermistor is disconnected or reads outside the resistance ranges in the table. Part Number STH042 4/16...

  • Page 108: Compressor Electrical Diagnostics

    If continuity is present, the compressor windings are grounded and the compressor should be replaced. To determine if the compressor is seized check the amp draw while the compressor is trying to start. Part Number STH042 4/16...
  • Page 109 The wiring must be correctly sized to minimize voltage drop at compressor start-up. The voltage when the compressor is trying to start must be within ±10% of the nameplate voltage. Part Number STH042 4/16...

  • Page 110: Fan Cycle Control

    Reconnect electrical power to the ice machine and press the power button to ON. Wait until water flows over the evaporator then refer to chart below. System Pressure: Reading Fan Should Be: Should Be: above cut-in 0 volts running below cut-out line voltage Part Number STH042 4/16...

  • Page 111: High Pressure Cutout (Hpco) Control

    Replace the HPCO control if it: • Will not reset (below 300 psig) • Does not open at the specified cut-out point Part Number STH042 4/16...

  • Page 112: Filter-Driers

    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. This is very important because ice machines have a back-flushing action that takes place during every harvest cycle.

  • Page 113: Refrigerant Recovery/Evacuation

    “reclaimed” unless it has been chemically analyzed and meets ARI Standard 700 (latest edition). New Product Specifications This means ARI Standard 700 (latest edition). Chemical analysis is required to assure that this standard is met. Part Number STH042 4/16...

  • Page 114: Refrigerant Re-Use Policy

    REFRGERANT RE-USE POLCY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’...
  • Page 115 Compressor motor burnouts and improper past service prevent refrigerant re-use. • Refer to “System Contamination Cleanup” on page 119 to test for contamination. 5. “Substitute” or “Alternative” Refrigerant • Must use only Manitowoc-approved alternative refrigerants. • Must follow Manitowoc-published conversion procedures. Part Number STH042 4/16...

  • Page 116: Recovery And Recharging Procedures

    mportant Replace the liquid line drier before evacuating and recharging. Use only a Manitowoc (O.E.M.) liquid line filter drier to prevent voiding the warranty. CONNECTIONS 1. Suction side of the compressor through the suction service valve.
  • Page 117 Follow the Charging Procedures below. CHARGING PROCEDURES mportant The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed. 1. Be sure the power button is in the OFF position.
  • Page 118 Allow the pressures to equalize while the ice machine is in the freeze cycle. Close the low side service valve at the ice machine. 9. Remove the hoses from the ice machine and install the caps. Part Number STH042 4/16...

  • Page 119: System Contamination Cleanup

    This section describes the basic requirements for restoring contaminated systems to reliable service. mportant 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.
  • Page 120 Refrigeration test kit or acid oil test shows harmful acid content No burnout deposits in open compressor lines Severe Compressor Burnout symptoms Severe Oil is discolored, acidic, and smells acrid contamination Burnout deposits found in the cleanup procedure compressor, lines, and other components Part Number STH042 4/16...

  • Page 121: Procedure

    You should use an electronic leak detector after system charging to be sure there are no leaks. 5. Charge the system with the proper refrigerant to the nameplate charge. 6. Operate the ice machine. Part Number STH042 4/16...

  • Page 122: Severe System Contamination Cleanup

    Repeat until the pressure drop is acceptable. 12. Operate the ice machine for 48 – 72 hours. Replace the suction line and liquid line drier if necessary. 13. Follow normal evacuation procedures. Part Number STH042 4/16...

  • Page 123: Replacing Pressure Controls Without

    Tighten the wing nuts until the block is tight and the tubing is rounded. NOTE: The pressure controls will operate normally once the tubing is re-rounded. Tubing may not re-round 100%. Part Number STH042 4/16...
  • Page 124 FG. A - “PNCHNG OFF” TUBNG FG. B - RE-ROUNDNG TUBNG SV1406 Using Pinch Off Tool Part Number STH042 4/16...

  • Page 125: Total System Refrigerant Charge

    12 oz U240 R404A (369 g) (340 g) U310 Serial Number 15 oz 14 oz R404A 310304977 and (425 g) (397 g) Earlier U310 Serial Number 15 oz 18 oz R404A 310304978 and (425 g) (510g) After Part Number STH042 4/16...
  • Page 126 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...

  • Page 127: Cycle Times, 24 Hr. Ice Production And Refrigerant Pressure Charts

    • Record beginning of freeze cycle suction pressure one minute after the water pump energizes. • 50Hz dice and half dice production derate is 12%. • 50Hz regular cube production derate is 14%. Part Number STH042 4/16...

  • Page 128: U0140 Self-Contained Air-Cooled

    55-18 135-170 75-110 70/21 200-250 60-20 140-170 75-120 80/27 220-265 65-22 145-190 75-120 90/32 240-315 70-24 165-200 75-120 100/38 300-380 80-30 200-235 75-120 110/43 310-400 90-32 210-240 75-120 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 129: U0140 Self-Contained Water-Cooled

    55-22 135-155 90-115 70/21 225-235 65-24 145-160 100-130 80/27 225-240 65-24 145-165 100-130 90/32 225-245 65-24 145-165 110-130 100/38 225-245 70-25 150-175 115-140 110/43 225-245 70-26 150-180 115-145 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 130: U0190 Self-Contained Air-Cooled

    60-38 150-170 90-110 70/21 200-260 80-38 150-170 95-130 80/27 240-290 80-39 160-190 100-130 90/32 260-330 80-40 160-190 100-130 100/38 310-380 85-41 180-210 105-135 110/43 315-390 90-41 180-215 110-135 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 131: U0240 Self-Contained Air-Cooled

    65-32 145-200 85-110 70/21 220-310 75-34 155-210 90-120 80/27 270-330 80-36 175-225 90-140 90/32 290-350 80-38 185-245 90-150 100/38 320-410 85-39 200-260 90-155 110/43 355-430 90-40 220-280 90-160 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 132: U0240 Self-Contained Water-Cooled

    65-30 130-150 80-110 70/21 230-240 70-32 135-160 90-120 80/27 230-240 70-34 135-160 90-120 90/32 230-240 70-36 135-165 90-120 100/38 230-245 75-35 135-170 90-120 110/43 230-250 80-38 140-175 95-125 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 133: U0310 Self-Contained Air-Cooled

    130-150 75-105 50/10 200-250 50-18 135-150 75-105 70/21 200-270 55-20 140-175 75-110 80/27 240-300 60-22 165-185 105-125 90/32 275-350 65-23 175-220 130-150 100/38 400-320 70-25 210-240 135-155 110/43 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 134: U0310 Self-Contained Water-Cooled

    150-175 75-90 50/10 230-240 50-25 150-175 75-90 70/21 235-240 50-26 155-175 75-95 80/27 235-240 55-27 165-180 80-100 90/32 235-250 60-27 165-180 80-100 100/38 235-255 60-28 165-180 80-100 110/43 Suction pressure drops gradually throughout the freeze cycle Part Number STH042 4/16...

  • Page 135: Wiring Diagrams

    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) Part Number STH042 4/16...

  • Page 136: U140/U190/U240 Wiring Diagram

    U140/U190/U240 WIRING DIAGRAM WITHOUT J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 137: U310 Wiring Diagram

    U310 WIRING DIAGRAM WITHOUT J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 138: U140/U190/U240 Wiring Diagram

    U140/U190/U240 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 139: U310 Wiring Diagram

    U310 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 140: Electronic Control Board With J4 Thermistor

    ELECTRONIC CONTROL BOARD WITH J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 141: J4 Thermistor Terminal

    ELECTRONIC CONTROL BOARD WITH J1 AND WITHOUT J4 THERMISTOR TERMINAL Part Number STH042 4/16...

  • Page 142: Electronic Control Board Prior To J1 The Terminal

    ELECTRONIC CONTROL BOARD PRIOR TO J1 THE TERMINAL WATER PUMP HIGH FLOAT MAIN COMP LOW FLOAT BIN SWITCH WATER DUMP HARVEST TEST SWITCH WATER FILL FUSE Part Number STH042 4/16...

  • Page 143: Tubing Schematic - U0140

    VALVE HARVEST SOLENOID STRAINER COMPRESSOR DRIER AIR OR WATER CONDENSER RECEIVER (WATER COOLED ONLY) Tubing Schematic - U0190/U0240/U0310 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HARVEST SOLENOID VALVE STRAINER COMPRESSOR DRIER AIR OR WATER CONDENSER RECEIVER (WATER COOLED ONLY) Part Number STH042 4/16...
  • Page 144 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH042 4/16...
  • Page 146 ©2015 Manitowoc Foodservice except where explicitly stated otherwise. All rights reserved. Continuing product improvement may necessitate change of specifications without notice. Part Number STH042 4/16...

Table of Contents