icetro WU-0100A Technician's Handbook
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icetro WU-0100A Technician's Handbook

Undercounter ice machines
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Undercounter Ice Machines
Technician's Handbook
Revision Date: 1/24/22

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  • Page 1 Undercounter Ice Machines Technician’s Handbook Revision Date: 1/24/22...
  • Page 3 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 Appliance.

  • Page 9: Table Of Contents

    Table of Contents General Information Model Numbers ..............14 .......15 How to Read a Model Number How to Read a Serial Number ........16 Ice Cube Sizes ..............17 Model & Serial Number Location .....17 Installation ..........18 Location of Ice Machine Ice Machine Clearance Requirements ....19 Ice Machine Heat of Rejection .......19...
  • Page 10 Operation Sequence of Operation IC/IU-0170 & IC/IU-0220 ...........53 Main Power Switch ..........53 Sequence of Operation ........55 Error Codes .............61 Troubleshooting Error Codes ......63 Operational Checks ............65 Ice Thickness Check ..........65 Ice Thickness Adjustment ........65 ....67 Minimum/Maximum Slab weight Sequence of Operation WU-0100 .......68 WU-0100 Energized Parts Chart .......70...
  • Page 11 Analyzing Discharge Pressure .......91 Analyzing Suction Pressure ......93 .............96 Hot Gas Valve Discharge Line Temperature Analysis ..100 Final Analysis .............102 ........103 Troubleshooting WU-0100 Diagnosing An Ice Machine That ............103 Will Not Run Error Codes ............104 Error Code Checklist ...........105 Diagnosing Ice Thickness Control Circuitry 108 Ice Production Check ..........110 Installation/Visual Inspection Checklist...
  • Page 12 Component Check Procedures Main Fuse ..............123 Bin Switch All Models ........124 Float Switch ........126 IC/IU-0170 & IC/IU-0220 Water Trough Thermistor ........128 IC/IU-0170 & IC/IU-0220 ICE/OFF/WASH Toggle Switch All Models .............129 Compressor Electrical Diagnostics ....130 High Pressure Cutout (HPCO) Control IC/IU-0170 & IC/IU-0220 ........132 Filter-Driers ..............133...
  • Page 13 Charts Cycle Times, 24 Hr. Ice Production and ........149 Refrigerant Pressure Charts ..............150 WU-0100 IC/ID-0170 & IC/ID-0220 ........151 Diagrams Wiring Diagrams ............152 ........153 WU-0100 Wiring Diagram IU-0170 & IU-0220 Wiring Diagram ....154 Printed Circuit Boards (PCB) WU-0100 PCB ............155 IC/IU-0170 & IC/IU-0220 PCB (Floats) ...156 IU-0170 &...
  • Page 14 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 15: General Information

    General Information Model Numbers This manual covers the following models: Self-contained Self-contained Air-cooled Water-cooled WU-0100A – IC-0170A – IU-0170A – IC-0220A – IU-0220A – Ice Machine Warranty Information For warranty information visit: http://www.icetroamerica.com/service-support • Warranty Registration • Warranty Procedure Form •...

  • Page 16: How To Read A Model Number

    How to Read a Model Number...

  • Page 17: How To Read A Serial Number

    How to Read a Serial Number...

  • Page 18: Ice Cube Sizes

    2.22 x 2.22 x2.22 cm 0.95 x 2.86 x 2.22 cm Model/Serial Number Location These numbers are required when requesting information from your local Icetro Distributor, service representative, or Icetro America. The model and serial number are listed on the OWNER WARRANTY REGISTRATION CARD.

  • 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 Self-contained Air-cooled Water-cooled Top/Sides 5" (127 mm)* 5" (127 mm)* Back 5" (127 mm)* 5" (127 mm)* *The ice machine may be built into a cabinet. Ice Machine Heat of Rejection Series Heat of Rejection* Ice Machine Air Conditioning** Peak...

  • Page 21: Leveling The Ice Machine

    Leveling the Ice Machine 1. Screw the legs onto the bottom of the ice machine. 2. Screw the foot of each leg in as far as possible. Caution The legs must be screwed in tightly to prevent them from bending. 3.

  • Page 22: Electrical Requirements

    Electrical Requirements Voltage The maximum allowable voltage variation is ±10% of the rated voltage on the ice machine model/serial number plate at start-up (when the electrical load is highest). Fuse/Circuit Breaker A separate fuse/circuit breaker must be provided for each ice machine.

  • Page 23: Water Service/Drains

     m ortant If you are installing an Icetro water filter system, refer to the Installation Instructions supplied with the filter system for ice making water inlet connections.

  • Page 24: 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 1/4" drop per foot of run and must not create traps. •...

  • Page 25: Water Supply & Drain Line Sizing/Connections

    Water Supply and Drain Line Connections...

  • Page 26: Maintenance

    Maintenance Interior Cleaning and Sanitizing General Descale and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent descaling and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.

  • Page 27: Remedial Cleaning

    Initiating 'WASH' Operation Please follow the preceding steps to initiate and complete the 'WASH' cycle on your Icetro ice machine. Step 1 Set the 'ICE/OFF/WASH switch to 'OFF' and wait for the ice machine to stop after the harvest cycle ends and ice falls from the evaporator.
  • Page 28 Caution Do not mix Ice Machine Cleaner and Sanitizer solutions together. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling. To start a cleaning cycle, set the 'ICE/OFF/ Step 3 WASH' switch to 'WASH'. Water will flow into the trough until it satisfies the float switch(s).
  • Page 29 Mix a solution of cleaner and warm water. Step 5 Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly descale all parts. Solution Type Water Mixed with...
  • Page 30 Mix a solution of sanitizer and warm water. Step 7 Solution Type Water Mixed With Sanitizer 3 gal. (12 l) 2 oz (60 ml) sanitizer part number 9405653 Use half of the sanitizer/water solution to sanitize all removed components. Use a spray bottle to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution.
  • Page 31 Remove Parts for Descaling Warning Disconnect electrical power to the ice machine at the disconnect/breaker box before proceeding. 1. Remove the Low-Level/Harvest Float Switch and High- Level/Ice Thickness Float Switch (older models). • Pull forward on the bottom of the bracket until clear of the tab, then slide bracket upward to remove the bracket and float as an assembly.
  • Page 32 DISCONNECT FLOAT FOR COMPLETE REMOVAL Caution Do not disassemble float for descaling - Incorrect reassembly will result in an ice machine that will not harvest.
  • Page 33 2. Remove the Slush Thermistor and Water Trough • Remove the screw from on top of the slush thermistor that is holding it to the top of the water trough. • Remove the slush thermistor. • While supporting the water trough remove the upper and lower thumbscrews from the water trough.
  • Page 34 3. Remove the Ice Damper • 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...
  • Page 35 4. Remove the Water Distribution Tube • Remove thumbscrews from the left and right of distribution tube. • 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.
  • Page 36 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 37: Cleaning The Condenser

    CLEANING THE CONDENSER General Warning Disconnect electrical power to the ice machine at the disconnect/breaker box before cleaning the condenser. A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. • Clean the condenser at least every six months.

  • Page 38: Removal From Service/Winterization

    REMOVAL FROM SERVICE/WINTERIZATION Self-contained Air-cooled ice machines 1. Descale and sanitize the ice machine. 2. Set the 'ICE/OFF/WASH' switch to the 'OFF' position. 3. Turn off the water supply, disconnect and drain the incoming ice-making water line at the rear of the ice machine and drain the water trough.

  • Page 39: Bin Removal

    BIN REMOVAL - OLD MODELS IC-0170/IU-0170/IC-0220/IU-0220 1. Disconnect power. 2. Remove all ice from bin. 3. Remove air filter and louver from lower front of machine. 4. Loosen screws and rotate clips to release bin from base. 5. Disconnect clamp and remove bin drain. 6.
  • Page 40 BIN REMOVAL - NEW MODELS IU-0170 & IU-0220 1. Disconnect power. 2. Remove all ice from bin. 3. Remove air filter and louver from lower front of machine. 4. Remove screws from the left & right side of the ice machine. 5.

  • Page 41: Detailed Descaling And Sanitizing Procedure Wu-0100

    Detailed Descaling and Sanitizing Procedure WU-0100 Ice machine cleaner is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime. Set the 'ICE/OFF/WASH' switch to 'OFF' and Step 1 wait for the ice machine to stop after the harvest cycle ends and ice falls from the evaporator.
  • Page 42 Wait until the cycle is complete Step 5 (approximately 21 minutes) then place the 'ICE/OFF/ WASH' switch in the 'OFF' position and disconnect power and water supplies to the ice machine. Warning Disconnect electric power to the ice machine at the electric switch box before proceeding.
  • Page 43 Remove the Ice Thickness Probe • Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket. NOTE: At this point, the ice thickness probe can easily be descaled. If complete removal is desired disconnect the ice thickness probe wire behind the rear bulkhead.
  • Page 44 Remove the Water Distribution Tube • Loosen the two thumbscrews, which secure the distribution tube. • Lift the distribution tube up off the thumbscrews. Disassembly • Twist the barbed end until the tab lines up with the key way. • Pull the inner tube end outward...
  • Page 45 Remove the Float Valve • Disconnect the water inlet tube from the float valve at the JG fitting by pushing down on the collar and lifting up on the tubing. • Loosen the two screws holding the float assembly to the read bulkhead.
  • Page 46 Remove the Water Trough • Apply downward pressure on the siphon tube and remove from the bottom of the water trough. • Remove the upper thumbscrew. • While supporting the water trough remove the two thumbscrews from beneath the water trough. •...
  • Page 47 Remove the ice damper. • Grasp left side of ice damper and apply pressure against the right-hand ice damper mounting bracket. • Pull forward on the ice damper until the left hand mounting pin disengages. Installation • Grasp the right side of ice damper and place left hand pin in the mounting bracket.
  • Page 48 Remove the Bin Door • With the door open, slide the pins on the right-hand side of bin door to the left and pull down until the right-hand side disengages the track. • While supporting the door, allow the right-hand side of the door to naturally fall into the bin and the left-hand side of the door will disengage the track.
  • Page 49 Mix a solution of cleaner and warm water. Step 7 Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly descale all parts. Solution Type Water Mixed with...
  • Page 50 Use 1/2 of the sanitizer/water solution to Step 11 sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing. Use 1/2 of the sanitizer/water solution to Step 12 sanitize all foodzone surfaces of the ice machine and bin.
  • Page 51 Mix a solution of sanitizer and warm water. Step 18 Solution Type Water Mixed With Sanitizer 1 gal. (23 l) 4 oz (120 ml) sanitizer Use 1/2 of the sanitizer/water solution to Step 19 sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution.

  • Page 52: Cleaning The Condenser

    CLEANING THE CONDENSER A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below. 1. The washable filter on self-contained ice machines is designed to catch dust, dirt, lint and grease.

  • Page 53: Removal From Service/Winterization

    REMOVAL FROM SERVICE/WINTERIZATION Self-contained Air-cooled ice machines Special precautions must be taken if the ice machine is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F (00C) or below. 1. Disconnect the electric power at the circuit breaker or the electric service switch.

  • Page 54: Sequence Of Operation

    Operation Sequence of Operation IC-0170/IU-0170/IC-0220/IU-0220 MAIN POWER SWITCH The 'ICE/OFF/WASH' switch is located on the front of the machine, toward the lower right-hand side. Powering the machine on and off The 'ICE/OFF/WASH' switch is used to start and stop ice making.
  • Page 55 Entering a wash cycle Placing the switch in the 'WASH' position will initiate the cleaning cycle. NOTE: Once a cleaning cycle has begun, the machine will not make ice until the cleaning cycle is completed (approximately 21 minutes). Additionally, once the cleaning cycle has finished, all operation will stop and the 'ICE/OFF/WASH' switch must be placed back to the 'ICE' position for the machine to resume ice making.

  • Page 56: Sequence Of Operation

    SEQUENCE OF OPERATION The 'ICE/OFF/WASH' switch must be in the 'ICE' position and the ice damper must be closed before the ice machine will start. The following is the primary sequence of operation. Initial Start-Up or Start-Up After Automatic Shutdown 1.
  • Page 57 5. Water Pump Once both float switches are satisfied, the water pump energizes and water flows over the evaporator. Slush Thermistor When the temperature of the water reaches 34°F the water pump de-energizes for approximately 15 seconds. When the water pump energizes again, the water inlet valve also energizes to fill the water trough with fresh water for approximately 5 seconds.
  • Page 58 Harvest Sequence 5. Harvest With the water pump de-energized, the dump valve and hot gas valve are energized. The refrigerant gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage bin. After a 30 second water purge, the dump valve is de- energized and the water inlet valve is energized to fill the water trough until the float switch(s) are satisfied.
  • Page 59 Automatic Shut-Off 7. Automatic Shut-Off When the storage bin is full at the end of a harvest sequence, the sheet of cubes fails to clear the ice damper and will hold it open. After the ice damper is held open for 7 seconds, the ice machine shuts off. The ice machine remains off until enough ice has been removed from the storage bin to allow the ice to clear the ice damper.

  • Page 62: Error Codes

    ERROR CODES Error codes are stored by the control board and indicated by the LED lights on the front of the machine. The number of cycles required to stop the ice machine varies for each error code. Error codes can be reset by cycling the 'ICE/OFF/WASH' switch between 'OFF' and 'ICE' and starting a new ice making cycle.
  • Page 63 POWER indicator (green) - Lights up solid when power is supplied to the machine. • POWER indicator flashes 1. Water Supply Issue: High-level float does not detect water within 5 minutes of the water inlet valve being energized. 2. Extended Freeze: Freeze time exceeds 65 minutes. 3.

  • Page 64: Troubleshooting Error Codes

    TROUBLESHOOTING ERROR CODES Error codes are designed to notify the technician of a problem and, in some cases, stop the ice machine prior to a major component failure. This may be difficult to diagnose, as many external problems occur intermittently. The following checklists are designed to assist the service technician in analysis.
  • Page 65 ERROR CODE FULL indicator (yellow) flashing: 1. Water Supply Issue: High-level float detects water 10 minutes sooner than the low-level float. Possible cause checklist • Check that the float(s) are properly installed. • Check that the float(s) are working properly. •...

  • Page 66: Operational Checks

    Operational Checks ICE THICKNESS CHECK (FLOAT SWITCH) After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice bridge connects the ice cubes and must be set to maintain an ice bridge thickness of 1/8" (3.2 mm). To adjust the thickness of the bridge refer to ice thickness adjustment.
  • Page 67 Operational Checks ICE THICKNESS CHECK (ICE THICKNESS PROBE) After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice bridge connects the ice cubes and must be set to maintain an ice bridge thickness of 1/8" (3.2 mm).

  • Page 68: Minimum/Maximum Slab Weight

    MINIMUM/MAXIMUM SLAB WEIGHT Minimum Maximum Model Ice Weight Per Cycle Ice Weight Per Cycle Grams Grams 2.26 lbs 2.93 lbs IC-0170 1025 grams 1329 grams 2.26 lbs 2.93 lbs IU-0170 1025 grams 1329 grams 2.26 lbs 2.93 lbs IC-0220 1025 grams 1329 grams 2.26 lbs 2.93 lbs...

  • Page 69: Sequence Of Operation Wu-0100

    Sequence of Operation WU-0100 Initial start-up or start-up after automatic shut-off 1. Pressure Equalization Before the compressor starts the hot gas valve is energized for 15 seconds to equalize pressures during the initial refrigeration system start-up. 2. Refrigeration System Start-up The compressor is energized after the 15-second pressure equalization, and remains on throughout the entire Freeze and Harvest Sequences.
  • Page 70 5. Harvest The water pump de-energizes stopping flow over the evaporator. The rising level of water in the sump trough diverts water out of the overflow tube, purging excess minerals from the sump trough. The hot gas valve also opens to divert hot refrigerant gas into the evaporator. The refrigerant gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage bin.

  • Page 73: Operational Checks Wu-0100

    Operational Checks WU-0100 SIPHON SYSTEM To reduce mineral build-up and cleaning frequency, the water in the sump trough must be purged during each harvest cycle. When the water pump de-energizes the level in the water trough rises above the standpipe starting a siphon action. The siphon action stops when the water level in the sump trough drops.

  • Page 74: Water Level Check

    WATER LEVEL CHECK The float valve is factory-set for the proper water level. If adjustments are necessary: 1. Verify the ice machine is level. 2. Place the main 'ICE/OFF/WASH' switch to the 'ON' position, and wait until the float valve stops adding water.

  • Page 75: Ice Thickness Check

    ICE THICKNESS CHECK After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is set to maintain an ice bridge of 1/8” (3.2 mm). If an adjustment is needed, follow the steps below. 1.

  • Page 76: Troubleshooting

    Troubleshooting Troubleshooting IC-0170/IU-0170/IC-0220/IU-0220 NOTE: Refer to “Troubleshooting WU-0100” on page 106 for that model. PROBLEM CHECKLIST Problem Possible Cause Correction No electrical power to Replace the fuse/reset the the ice machine. breaker/turn on the main switch/plug power cord into receptacle. Ice machine does Ice machine needs to Turn 'ICE/OFF/WASH'...
  • Page 77 Problem Possible Cause Correction Harvest float switch Descale and sanitize the ice is dirty. machine. Harvest float switch Connect the wire Ice machine does wire is disconnected. not cycle into Harvest float switch is Adjust the harvest float out of adjustment. switch.

  • Page 78: Control Board (Ic/Iu-0170 & Ic/Iu-0220)

    CONTROL BOARD (IC-0170/IU-0170/IC-0220/IU-0220) FUNCTION The PCB is what controls the operation of all the major components within the ice machine. Each major component has a white relay above it's terminal connection on the PCB. Above that relay is a green light that will illuminate anytime power is being sent to that component.
  • Page 79 CONTROL BOARD (PCB) Cont. FREEZE MODE: Sequence of Operation Dump valve (black) & hot gas valve (red) energized to flush water & equalize pressure. Compressor (brown), condenser (blue) , & water inlet valve (yellow) energized for prechill & water fill.
  • Page 80 CONTROL BOARD (PCB) Cont. FREEZE MODE: Sequence of Operation Compressor (brown), condenser (blue), water pump (white) energized to circulate & freeze water to evaporator. Compressor (brown), condenser (blue) , & hot gas valve (red) energized for harvest.

  • Page 81: 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. Removing the control board fuse or moving the 'ICE/OFF/WASH' switch to 'OFF' will not remove the power supplied to the control board. 1.

  • Page 82: Ice Machine Does Not Cycle Into Harvest When

    ICE MACHINE DOES NOT CYCLE INTO HARVEST WHEN THE HARVEST FLOAT IS DOWN/CLOSED (OLD MODELS) NOTE: The ice machine will make a thick or double slab when a new freeze cycle is started with ice already present on the evaporator. Two of the most common scenarios are: •...

  • Page 83: Ice Machine Does Not Cycle Into Harvest When

    ICE MACHINE DOES NOT CYCLE INTO HARVEST WHEN WATER TOUCHES THE ICE THICKNESS PROBE (NEW MODELS) NOTE: The ice machine will make a thick or double slab when a new freeze cycle is started with ice already present on the evaporator. Two of the most common scenarios are: •...

  • Page 84: Ice Machine Cycles Into Harvest Before The Harvest Float Is Down/Closed

    ICE MACHINE CYCLES INTO HARVEST BEFORE THE HARVEST FLOAT IS DOWN/CLOSED Disconnect power to the ice machine and Step 1 remove the low-level/harvest float switch (blue) from its connector on the outside of the control box.
  • Page 85 Reapply power and move the 'ICE/OFF/WASH' Step 2 switch to the 'ICE' position. Wait until water flows over the evaporator, then refer to chart. Result Correction The ice thickness float switch, connectors or The ice machine stays in freeze. wiring is causing the malfunction.

  • Page 86: Ice Production Check

    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 87 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 Icetro distributor for information on available options and accessories.

  • Page 88: Installation/Visual Inspection Checklist

    INSTALLATION/VISUAL INSPECTION CHECKLIST Ice machine is not level • Level the ice machine Condenser is dirty • 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 •...
  • Page 89 Vent tube is not installed on water outlet drain • See Installation Instructions Hoses, fittings, etc., are leaking water • Repair/replace as needed Water valve is stuck open, closed or is leaking • Descale/replace as needed Water is spraying out of the sump trough area •...

  • Page 90: Ice Formation Pattern

    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, it's important to keep in mind that any number of problems can cause improper ice formation. OUTLET INLET All Undercounter Cubers...
  • Page 91 Extremely Thin at Evaporator Outlet There is no ice, or a considerable lack of ice formation on the outlet of the evaporator. Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the outlet of the evaporator already has 1/2”...

  • Page 92: Analyzing Discharge Pressure

    ANALYZING DISCHARGE PRESSURE The discharge pressure is normal when the actual pressure falls within the published pressure range for the ice machine’s operating conditions. It is normal for the discharge pressure to be higher at the beginning of the freeze cycle (when load is greatest), then drops throughout the freeze cycle.
  • Page 93 • Overcharged • Non-condensible in system • Wrong type of refrigerant Other • Non-Icetro components in system • High side refrigerant lines/component restricted (before mid-condenser) Freeze Cycle Discharge Pressure Low Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on...

  • Page 94: 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 95 “Discharge Pressure High Checklist” on page 92. Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensible in system Other • Non-Icetro components in system • Hot Gas valve leaking • TXV flooding (check bulb mounting) • Defective compressor...
  • Page 96 Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Icetro components in system • Improper water supply over evaporator refer to ”Water System Checklist” on page 87. • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 97: 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 comprerssor and the evaporator and performs two functions: 1.
  • Page 98 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. If replacement is necessary, use only “original” Icetro replacement parts.
  • Page 99 Use the following procedure and table to help determine if a hot gas valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the harvest valve(s).  I mportant Feeling the harvest valve outlet or across the hot gas valve itself will not work for this comparison.
  • Page 100 Findings Comments This is normal as the discharge The inlet of the hot gas valve line should always be too hot to is cool enough to touch and touch and the hot gas valve inlet, the compressor discharge although too hot to touch during line is hot.

  • Page 101: Discharge Line Temperature Analysis

    DISCHARGE LINE TEMPERATURE ANALYSIS GENERAL Knowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.
  • Page 102 Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle: Ice machines that are operating normally will have consistent discharge line temperatures above 150°F (66°C). Verify the expansion valve sensing bulb is positioned and secured correctly. Discharge Line Temperature Below 150°F (66°C) at End of Freeze Cycle Ice machines that have a flooding expansion valve will have a discharge line temperature that decreases each...

  • Page 103: Final Analysis

    Final Analysis Hot Gas Valve Leaking A leaking hot gas valve must be replaced. Low Charge/TXV Starving Normally, a starving expansion valve only affects the freeze cycle pressures, not the harvest cycle pressures. A low refrigerant charge normally affects both pressures. Verify the ice machine is not low on charge before replacing an expansion valve.

  • Page 104: Troubleshooting Wu-0100

    Troubleshooting WU-0100 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board at all times. Removing control board fuse or moving the 'ICE/OFF/WASH' switch to 'OFF' will not remove the power supplied to the control board. 1.

  • Page 105: Error Codes

    Error Codes In addition to the standard safety controls, your Icetro ice machine features built-in error code that will stop the ice machine if conditions arise which could cause a major component failure. Error Code #1: If the freeze time exceeds 65 minutes, 3 consecutive times, the error LED (red) will blink.

  • Page 106: Error Code Checklist

    Error Code Checklist The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed. Error Code #1 Freeze time exceeds 65 minutes for 3 consecutive freeze cycles.
  • Page 107 • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan motorDirty condenser Refrigeration System • Non-Icetro components • Improper refrigerant charge • Defective compressor • Non-condensible in refrigeration system • Plugged or restricted high side refrigerant lines or component •...
  • Page 108 Loss of water from sump area • Clogged water distribution tube • Dirty/defective water inlet float • Defective water pump Electrical system • Bin switch defective • Premature harvest Refrigeration system • Non-Icetro components • Improper refrigerant charge • Defective hot gas valve...

  • Page 109: Diagnosing Ice Thickness Control Circuitry

    DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY Ice Machine Does Not Cycle Into Harvest when Water Contacts the Ice Thickness Control Probe Move the 'ICE/OFF/WASH' switch to 'OFF' and Step 1 back to 'ON' to start a new cycle. Wait until the water starts to flow over the evaporator.
  • Page 110 Ice Machine Cycles Into Harvest Before Water Contact with the Ice Thickness Probe Move the 'ICE/OFF/WASH' switch to 'OFF' and Step 1 back to 'ON' to start a new cycle. Wait until the water starts to flow over the evaporator. Disconnect the ice thickness probe from the Step 2 control box terminal.

  • Page 111: Ice Production Check

    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 112 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 Icetro distributor for information on available options and accessories.

  • Page 113: Installation/Visual Inspection Checklist

    INSTALLATION/VISUAL INSPECTION CHECKLIST Ice machine is not level • Level the ice machine Condenser is dirty • Clean the condenser Water filtration is not installed or plugged • Install a new water filter Water drains are not run separately and/or are not vented •...

  • Page 114: Water System Checklist

    WATER SYSTEM CHECKLIST A water-related problem often causes the same symptoms as a refrigeration system component malfunction. Water system problems must be identified and eliminated prior to replacing refrigeration components. Water area (evaporator) is dirty • Descale as needed Water inlet pressure not between 20 and 80 psig (1–5 bar, 138–552 kPa) •...
  • Page 115 Hoses, fittings, etc., are leaking water • Repair/replace as needed Water valve is stuck open, closed or is leaking • Descale/replace as needed Water is spraying out of the sump trough area • Stop the water spray Water is leaking through the sump trough overflow •...

  • Page 116: Wu-0100 Refrigeration Diagnostics

    WU-0100 Refrigeration Diagnostics This machine uses a capillary tube metering device system. An irregular ice fill pattern could indicate an improper refrigerant charge. If this is determined to be the case, recover any refrigerant left in the system, evacuate the system and weigh in a new charge according the the machine's data plate.

  • Page 117: Analyzing Discharge Line Temperature

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

  • Page 118: Analyzing Suction Line Temperature

    “Discharge Line Temperature High Checklist” on page 116. Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensible in system Other • Non-Icetro components in system • Hot gas valve leaking • Defective compressor...
  • Page 119 Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Icetro components in system • Improper water supply over evaporator refer to ”Water System Checklist” on page 113. • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 120: 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 and the evaporator and performs two functions: 1.
  • Page 121 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. If replacement is necessary, use only “original” Icetro replacement parts.
  • Page 122 Use the following procedure and table to help determine if a hot gas valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the harvest valve(s).  I mportant Feeling the hot gas valve outlet or across the hot gas valve itself will not work for this comparison.
  • Page 123 Findings Comments This is normal as the discharge The inlet of the hot gas valve line should always be too hot to is cool enough to touch and touch and the hot gas valve inlet, the compressor discharge although too hot to touch during line is hot.

  • Page 124: Component Check Procedures

    Component Check Procedures MAIN FUSE Function The control board fuse stops ice machine operation if electrical components fail causing high amp draw. Specifications • IC-0170/IU-0170/IC-0220/IU-0220 - 250 Volt, 5 amp • WU-0100 - 250 Volt 1 amp Warning High (line) voltage is applied to the control board at all times.

  • Page 125: Bin Switch All Models

    BIN SWITCH All Models Function Bin switch operation is controlled by the movement of the ice damper. The bin switch has two main functions: 1. Terminating the harvest cycle and returning the ice machine to the freeze cycle. This occurs when the bin switch is opened and closed again within 7 seconds of opening during the harvest cycle.
  • Page 126 Check Procedure 1. Toggle the 'ICE/OFF/WASH' switch to 'OFF'. 2. Watch the 'FULL' light on the front of the machine. 3. Move the ice damper upward, toward the evaporator. The bin switch must close. The 'FULL' light off indicates the bin switch has closed properly. 4.

  • Page 127: Float Switch

    FLOAT SWITCH IC-0170/IU-0170/IC-0220/IU-0220 Function The ice machine uses two float switches, which open and close to indicate to the control board the level of water in the water trough. Low-Level/Harvest Float -Indicates the water level has reached it's minimum point and verifies when the water level is low enough to initiate a harvest sequence.
  • Page 128 Testing The Float Switch: A simple continuity test can be used to test both of the float switches. 1. Disconnect power to the ice machine and disconnect the wire connector for the float switch on the backside of the bulkhead. 2.

  • Page 129: Water Trough Thermistor

    WATER TROUGH THERMISTOR IC-0170/IU-0170/IU-0220/IU-01220 Function Thermistor resistance values change with temperature. The value supplied to the control board is used to identify temperature at the thermistor location. Check procedure If the thermistor is open or shorted, replace it.

  • Page 130: Ice/Off/Wash Toggle Switch All Models

    ICE/OFF/WASH TOGGLE SWITCH All Models FUNCTION The switch is used to place the ice machine in ICE, OFF or WASH mode of operation. SPECIFICATIONS Single-pole, double-throw switch. CHECK PROCEDURE 1. Inspect the toggle switch for correct wiring. 2. Isolate the toggle switch by disconnecting all wires from the switch.

  • Page 131: 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 132 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 133: High Pressure Cutout (Hpco) Control

    HIGH PRESSURE CUTOUT (HPCO) CONTROL IC-0170/IU-0170/IU-0220/IU-0220 Function Stops the ice machine if subjected to excessive high-side pressure. The HPCO control is normally closed, and opens on a rise in discharge pressure. Specifications Cut-out: 426 psig ±10 Cut-in: Automatic reset (Must be below 355 psig to reset) Check Procedure 1.

  • Page 134: Filter-Driers

    Filter-Driers Liquid Line Filter Drier The filter-drier used on Icetro ice machines are manufactured to Icetro specifications. Always make sure to use an (O.E.M.) filter-drier when opening the refrigeration system. Important The liquid line drier is covered as a warranty part. The liquid line drier must be replaced any time the system is opened for repair.

  • Page 135: Refrigerant Recovery/Evacuation

    Refrigerant Recovery/Evacuation DEFINITIONS Recover To remove refrigerant, in any condition, from a system and store it in an external container, without necessarily testing or processing it in any way. Recycle To clean refrigerant for re-use by oil separation and single or multiple passes through devices, such as replaceable core filter-driers, which reduce moisture, acidity and particulate matter.

  • Page 136: Refrigerant Re-Use Policy

    REFRIGERANT RE-USE POLICY Icetro recognizes and supports the need for proper handling, re-use, and disposal of refrigerants. Icetro 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 137 • Compressor motor burnouts and improper past service prevent refrigerant re-use. • Refer to page 145 to test for contamination. 5. “Substitute” or “Alternative” Refrigerant • No substitute or alternative refrigerants are allowed without expressed, written approval from Icetro America.

  • Page 138: Recovery And Recharging Procedures

     I mportant Replace the liquid line drier before evacuating and recharging. Use only a Icetro (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 139 Follow the Charging Procedures below. CHARGING PROCEDURES  I mportant The charge is critical on all Icetro ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed. 1. Be sure the 'ICE/OFF/WASH' switch is in the 'OFF' position.
  • Page 140 7. Close the high side on the manifold gauge set. NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs. 8. Make sure that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.

  • Page 141: Recovery And Recharging Procedures Wu-0100

    WU-0100 Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations.  I mportant Icetro America assumes no responsibility for the contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 142 CHARGING PROCEDURES  I mportant The charge is critical on all Icetro ice machines. Use a scale to ensure the proper charge is installed. 1. Verify the 'ICE/OFF/WASH' switch is in the 'OFF' position.

  • Page 143: System Contamination Cleanup

    System Contamination Cleanup This section describes the basic requirements for restoring contaminated systems to reliable service.  I mportant Icetro America assumes no responsibility for the contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 144 Contamination/Cleanup Chart Symptoms/Findings Required Cleanup Procedure Normal evacuation/ No symptoms or suspicion of recharging contamination procedure Moisture/Air Contamination symptoms Refrigeration system open to atmosphere for longer than 15 minutes Mild contamination Refrigeration test kit and/or acid oil test cleanup procedure shows contamination No burnout deposits in open compressor lines...

  • Page 145: Mild System Contamination Cleanup

    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 146: Severe System Contamination Cleanup

    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 147 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 148: Replacing Pressure Controls Without Removing Refrigerant Charge

    REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE This procedure reduces repair time and cost. Use it when any of the following components require replacement, and the refrigeration system is operational and leak-free. • High pressure cut-out control • High side access valve •...

  • Page 149: Total System Refrigerant Charge

    Total System Refrigerant Charge Important This information is for reference only. Refer to the ice machine serial number tag to verify the system charge. Serial plate information overrides information listed on this page. Refrigerant Model Air-Cooled Water-Cooled Type 6.7 oz WU-0100 R134A 14.11 oz...

  • Page 150: Cycle Times, 24 Hr. Ice Production And Refrigerant Pressure Charts

    Charts Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts These charts are used as guidelines to verify correct ice machine operation. Accurate collection of data is essential to obtain the correct diagnosis. • Production and cycle times are for dice cube - Half dice cube cycle times can be 1-2 minutes faster depending on model and ambient temperature.
  • Page 151 WU-0100 SELF-CONTAINED AIR-COOLED NOTE: These characteristics will vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time...

  • Page 152: Ic/Id-0170 & Ic/Id-0220

    IC-0170/IU-0170/IC-0220/IU-0220 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time...

  • Page 153: Wiring Diagrams

    Diagrams Wiring Diagrams The following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice machine you are servicing. Warning Always disconnect power before working on electrical circuitry.

  • Page 154: Wu-0100 Wiring Diagram

    WU-0100 WIRING DIAGRAM Self Contained Air-cooled...

  • Page 155: Iu-0170 & Iu-0220 Wiring Diagram

    IC-0170/IU-0170/IC-0220/IU-0220 WIRING DIAGRAM Self Contained Air-cooled...

  • Page 156: Printed Circuit Boards (Pcb) Wu-0100 Pcb

    Printed Circuit Bards (PCB) WU-0100 PCB...

  • Page 157: Ic/Iu-0170 & Ic/Iu-0220 Pcb (Floats)

    IC-0170/IU-0170/IC-0220/IU-0220 PCB Part # 415010200 - V1 PCB Using High/Low Floats NOTE: PCB is backwards compatible with the original part # 415009100...

  • Page 158: Iu-0170 & Iu-0220 Pcb (Ice Thickness Probe)

    IC-0170/IU-0170/IC-0220/IU-0220 PCB Part # 415010201 - V2 PCB Using Ice Thickness Probe NOTE: PCB is not backwards compatible with part # 415009100 or part # 415010200...

  • Page 159: Tubing Schematics

    Tubing Schematics TUBING SCHEMATIC - WU-0100 EVAPORATOR HEAT EXCHANGER HARVEST SOLENOID AIR OR WATER COMPRESSOR CONDENSER DRIER...

  • Page 160: Tubing Schematic

    TUBING SCHEMATIC - IU0170 & IU0220 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HARVEST SOLENOID VALVE STRAINER COMPRESSOR DRIER AIR OR WATER CONDENSER...
  • Page 161 SPACE FOR TECHNICIAN'S NOTES...
  • Page 162 SPACE FOR TECHNICIAN'S NOTES...
  • Page 163 SPACE FOR TECHNICIAN'S NOTES...
  • Page 164 SPACE FOR TECHNICIAN'S NOTES...
  • Page 166 ICETRO AMIERICA 1565 W BROADWAY ANAHEIM, CA 92802 (714) 215-4864 WWW.ICETROAMERICA.COM ©2022 Icetro America except where explicitly stated otherwise. All rights reserved. Continuing product improvement may necessitate change of specifications without notice.

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