Manitowoc Q270 Technician's Handbook
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Manitowoc Q270 Technician's Handbook

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See also: Installation and Servicing Manual , Installation, Use & Care Manual
Manitowoc
Q210/Q270
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
America's #1 Selling Ice Machine
Part Number STH039 8/13

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  • Page 1 Manitowoc Q210/Q270 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 America’s #1 Selling Ice Machine Part Number STH039 8/13...

  • Page 2: Safety Notices

    Safety Notices As you work on Manitowoc equipment, be sure to pay close attention to the safety notices in this handbook. Disregarding the notices may lead to serious injury and/or damage to the equipment. Throughout this handbook, you will see the following...
  • Page 3 Procedural Notices As you work on Manitowoc equipment, be sure to read the procedural notices in this handbook. These notices supply helpful information which may assist you as you work. Throughout this handbook, you will see the following types of procedural notices:...
  • Page 4 Warning Do not use electrical appliances or accessories other than those supplied by Manitowoc for your ice machine model. Warning Two or more people or a lifting device are required to lift this appliance.
  • Page 5 Warning This equipment contains high voltage electricity and refrigerant charge. Installation and repairs are to be performed by properly trained technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure.The technician must also be certified in proper refrigerant handling and servicing procedures.
  • Page 6 Warning Do not obstruct machine vents or openings. Warning Do not store gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance. Warning Do not clean with water jet. Warning It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures.
  • Page 7 Warning When using electric appliances, basic precautions must always be followed, including the following: a. Read all the instructions before using the appliance. b. To reduce the risk of injury, close supervision is necessary when an appliance is used near children. c.
  • Page 8 Warning These 50 hz models contain up to 150 grams of R290 (propane) refrigerant. R290 (propane) is flammable concentrations between approximately 2.1% and 9.5% by volume (LEL lower explosion limit and UEL upper explosion limit). An ignition source at a temperature higher than 470°C is needed for a combustion to occur.

  • Page 9: Table Of Contents

    GENERAL INFORMATION Model Numbers ..... 5 How to Read a Model Number ..6 Model/Serial Number Location .
  • Page 10 TROUBLESHOOTING Ice Machine Will Not Run ..47 Diagnosing Ice Thickness Control Circuitry ......48 Ice Production Check .
  • Page 11 Refrigerant Recovery/Evacuation ..96 Recovery and Recharging Procedures 96 Q270 Condenser Fan Motor Replacement 97 COMPONENT SPECIFICATIONS Main Fuse ......99 Bin Switch .
  • Page 12 Q210 ......106 Q270 ......107 Electronic Control Boards .

  • Page 13: General Information

    General Information Model Numbers This manual covers the following models: Self-contained Air-cooled QYP0214A QYP0274A Warning An ice machine contains high voltage electricity and refrigerant charge. Repairs are to be performed properly trained refrigeration technicians aware of the dangers of dealing with high voltage electricity and refrigerant under pressure.The technician must also be certified in proper...

  • Page 14: How To Read A Model Number

    Y - Half-dice 4 - Half-dice, Air-cooled P - Propane ! Caution Use only Manitowoc approved Ice Machine Cleaner (part number 94-0546-3 original green ice machine cleaner or 000000084 clear metal safe ice machine cleaner) and Sanitizer (part number 94-0565-3). It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling.

  • Page 15: Model/Serial Number Location

    Model/Serial Number Location The model and serial numbers are required when requesting information from your local Manitowoc distributor, service representative, or Manitowoc Ice. The model and serial number are listed on the OWNER WARRANTY REGISTRATION CARD. They are also listed on the MODEL/SERIAL NUMBER DECAL affixed to the ice machine.

  • Page 16: Ice Machine Warranty Information

    Warranty coverage begins the day the ice machine is installed. If the OWNER WARRANTY REGISTRATION CARD is not returned, Manitowoc will use the date of sale to the Manitowoc Distributor as the first day of warranty coverage for your new ice machine.
  • Page 17 Authorized Warranty Service To comply with the provisions of the warranty, a refrigeration service company qualified and authorized by your Manitowoc distributor, or a Contracted Service Representative must perform the warranty repair. Service Calls Normal maintenance, adjustments and cleaning as outlined in this manual are not covered by the warranty.

  • Page 18: Residential Warranty Coverage

    Subject to the exclusions and limitations below, Manitowoc Ice (“Manitowoc”) warrants to the original consumer that any new ice machine manufactured by Manitowoc (the “Product”) shall be free of defects in material or workmanship for the warranty period outlined below under normal use and maintenance,...
  • Page 19 IN NO EVENT SHALL MANITOWOC OR ANY OF ITS AFFILIATES BE LIABLE TO THE CONSUMER OR ANY OTHER PERSON FOR ANY INCIDENTAL,...
  • Page 20 To secure prompt and continuing warranty service, this warranty registration card must be completed and sent to Manitowoc within thirty (30) days from the sale date. Complete the following registration card and send it to Manitowoc at the address shown above. Retain a copy for your records.

  • Page 21: 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 22: Ice Machine Clearance Requirements

    Series Ice Machine Air Conditioning** Peak Q210 2400 3400 Q270 3800 6000 * B.T.U./Hour ** Because the heat of rejection varies during the ice making cycle, the figure shown is an average. Ice machines, like other refrigeration equipment, reject heat through the condenser. It is helpful to know the...

  • Page 23: Leveling The Ice Machine

    Leveling the Ice Machine 1. Screw the leveling 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 24: Electrical Requirements

    Ice Machine Phase Cycle Circuit Amps Breaker Q210 230/1/50 15 amp Q270 230/1/50 15 amp * Indicates Preliminary Data Warning All wiring must conform to local, state and national codes and the appliance must be grounded. Part Number STH039 8/13...

  • Page 25: Component Identification

    Component Identification ICE THICKNESS PROBE DISTRIBUTION TUBE EVAPORATOR DAMPER WATER WATER PUMP TROUGH SV1694A Evaporator Compartment THUMBSCREWS WATER PUMP COVER WATER PUMP Part Number STH039 8/13...

  • Page 26: Evaporator Compartment

    FLOAT VALVE SIPHON CAP BIN SWITCH MAGNET SV1695A Evaporator Compartment Part Number STH039 8/13...

  • Page 27: Q270 Ice Machines

    ON/OFF/WASH TOGGLE SWITCH COMPRESSOR CONDENSER AIR COMPARTMENT FILTER ACCESS SCREWS SV1686G Q210 Ice Machines ON/OFF/WASH TOGGLE SWITCH CONDENSER AIR FILTER COMPRESSOR COMPARTMENT ACCESS SCREWS PT1288 Q270 Ice Machines Part Number STH039 8/13...
  • Page 28 This Page Intentionally Left Blank Part Number STH039 8/13...

  • Page 29: Maintenance

    Maintenance 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 30: Cleaning The Condenser

    Cleaning the Condenser Warning Disconnect electric power to the ice machine at the electric service switch and follow lockout tag out procedures before cleaning the condenser. ! Caution If you are cleaning the condenser fan blades with water, cover the fan motor to prevent water damage.
  • Page 31 4. Blow compressed air through the condenser fins from the inside. Be careful not to bend the fan blades. 5. Use a commercial condenser coil cleaner. Follow the directions and cautions supplied with the cleaner. 6. Straighten any bent condenser fins with a fin comb.

  • Page 32: Interior Cleaning And Sanitizing

    The ice machine must be taken apart for cleaning and sanitizing. ! Caution Use only Manitowoc approved Ice Machine Cleaner (part number 95-0546-3) Sanitizer (part number 94-0565-3). It is a...
  • Page 33 Step 2 Remove all ice from the bin. Step 3 To start a cleaning cycle, move the toggle switch to the WASH position. Step 4 Add the proper amount of Manitowoc Ice Machine Cleaner to the water trough. Model Amount of Cleaner...
  • Page 34 Step 6 Remove parts for cleaning. A. Remove Two Thumbscrews and Water Pump Cover. B. Remove the Vinyl Hose Connecting the Water Pump and Water Distribution Tube C. Remove Water Pump • Disconnect the water pump power cord • Loosen the screws securing the pump- mounting bracket to the bulkhead •...
  • Page 35 Ice Thickness Probe Cleaning • Mix a solution of Manitowoc ice machine cleaner and water (60 ml of cleaner to 475 ml of water) in a container. •...
  • Page 36 E. Remove the Water Distribution Tube 1. LIFT UP 2. SLIDE BACK 3. SLIDE TO RIGHT DISTRIBUTION THUMB TUBE SCREW THUMB SCREW SV1630 Water Distribution Tube Removal • Loosen the two thumbscrews, which secure the distribution tube. • Lift the right side of the distribution tube up off the locating pin, then slide it back and to the right.
  • Page 37 Disassembly • Twist both of the inner tube ends until the tabs line up with the keyways. • Pull the inner tube ends outward. INNER TUBE INNER TUBE KEYWAY SV1211 Water Distribution Tube Disassembly Part Number STH039 8/13...
  • Page 38 F. Remove the Float Valve • Turn the splash shield counterclockwise one or two turns. FLOAT VALVE BRACKET COMPRESSION FITTING SHUT-OFF VALVE CAP AND FILTER SCREEN SPLASH SHIELD FLOAT SV1695-2 Float Valve Removal • Pull the float valve forward and off the mounting bracket.
  • Page 39 G. 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 40 H. Remove Damper • Grasp ice damper and apply pressure toward the left hand mounting bracket. • Apply pressure to the right hand mounting bracket with thumb. • Pull ice damper forward when the right hand ice damper pin disengages. STEP 3 STEP 2 STEP 1...
  • Page 41 Remove the Bin Door • Grasp the rear of the bin door and pull bin door forward approximately 13 cm. • Slide bin door to the rear while applying upward pressure (The rear door pins will ride up into the track slot and slide backward to the stop tab).
  • Page 42 Step 7 Mix a solution of cleaner and warm water. 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 clean all parts. Solution Water Mixed with...
  • Page 43 Step 13 Replace all removed components. Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position. Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough. Model Amount of Sanitizer...
  • Page 44 Step 18 Use 1/2 of the sanitizer/water solution to 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.

  • Page 45: Removal From Service/Winterization

    Removal from Service/Winterization General 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 0°C or below. ! Caution If water is allowed to remain in the ice machine in freezing temperatures, severe damage to some components could result.
  • Page 46 This Page Intentionally Left Blank Part Number STH039 8/13...

  • Page 47: Operation

    Operation INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 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. Refrigeration System Start-up The compressor starts after the 15-second pressure equalization, and remains on throughout the entire Freeze and Harvest Sequences.

  • Page 48: Harvest Sequence

    HARVEST SEQUENCE 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.

  • Page 49: Energized Parts Chart

    ENERGIZED PARTS CHART * Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control; therefore, it may cycle on and off. Part Number STH039 8/13...
  • Page 50 Part Number STH039 8/13...

  • Page 51: Operational Checks

    Operational Checks 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.
  • Page 52 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. Remove the siphon cap from the standpipe. 3. Place the main ON/OFF/WASH toggle switch to the ON position, and wait until the float valve stops adding water.
  • Page 53 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 3 mm. If an adjustment is needed, follow the steps below. 1. Turn the ice thickness probe adjustment screw clockwise for a thicker ice bridge, or counterclockwise for a thinner ice bridge.
  • Page 54 This Page Intentionally Left Blank Part Number STH039 8/13...

  • Page 55: Troubleshooting

    Troubleshooting ICE MACHINE WILL NOT RUN Warning An ice machine contains high voltage electricity and refrigerant charge. Repairs are to be performed properly trained refrigeration technicians aware of the dangers of dealing with high voltage electricity and R290 (propane) refrigerant under pressure.The technician must also be certified in proper refrigerant handling and servicing procedures.

  • Page 56: 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 Step 1 Bypass the freeze time lock-in feature by moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator.
  • Page 57 Step 3 Disconnect the ice thickness probe from the control board terminal. Clip the jumper wire to the terminal on the control board and any cabinet ground. Monitor the harvest light. PROBE ICE THICKNESS CONNECTION PROBE JUMPER WIRE GROUND BIN SWITCH HARVEST LIGHT EVAPORATOR LIGHT...
  • Page 58 Ice Machine Cycles Into Harvest Before Water Contact with the Ice Thickness Probe Step 1 Bypass the freeze time lock-in feature by moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator, then monitor the harvest light.

  • Page 59: Ice Production Check

    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 STH039 8/13...

  • Page 60: Installation And Visual Inspection Checklist

    INSTALLATION AND 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 61: Water System Checklist

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

  • Page 62: Ice Formation Pattern

    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. Any number of problems can cause improper ice formation.
  • Page 63 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 12 mm to 25 mm of ice formation.

  • Page 64: 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. Before calling for service, re-start the ice machine using the following procedure: 1.
  • Page 65 Safety Limits In addition to standard safety controls, the control board has two built in safety limit controls which protect the ice machine from major component failures. Safety Limit #1: If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle.
  • Page 66 Safety Limit Notes • A safety limit indication is completed before the water pump starts. Water contacting the ice thickness probe in the freeze cycle will cause the harvest light to flash. Do not mistake a harvest light flashing in the freeze cycle with a safety limit indication.
  • Page 67 Safety Limit 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. Safety Limit #1 Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.
  • Page 68 • Low water pressure 1.37 bar minimum • High water temperature 32°C maximum • Dirty condenser Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensable in refrigeration system •...
  • Page 69 Ice thickness probe out of adjustment • Ice thickness probe dirty • Bin switch defective • Premature harvest Refrigeration system • Non-Manitowoc components • Improper refrigerant charge • Defective hot gas valve • TXV flooding (check bulb mounting) • Defective fan cycling control...

  • Page 70: Analyzing Discharge Line Temperature

    ANALYZING DISCHARGE LINE TEMPERATURE 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 Temperature Charts” on page 101 for ice machine being checked.
  • Page 71 Improper Refrigerant Charge • Overcharged • Non-condensable in system • Wrong type of refrigerant Other • Non-Manitowoc components in system • High side refrigerant lines/component • Restricted (before mid-condenser) Freeze Cycle Discharge temperature Low Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist”...

  • Page 72: Analyzing Suction Temperature

    ANALYZING SUCTION TEMPERATURE The suction temperature gradually drops throughout the freeze cycle. The actual suction temperature (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 temperature drop throughout the freeze cycle, compare the published suction temperature to the published freeze cycle time.
  • Page 73 Procedure Step 1. Determine the ice machine operating conditions. Example: Air temp. entering condenser: 32°C Air temp. around ice machine: 27°C Water temp. entering water fill valve: 21°C 2A. Refer to “Cycle Time” and “Operating temperature” charts for ice machine model being checked. Using operating conditions from Step 1, determine published freeze cycle time and published freeze cycle suction temperature.
  • Page 74 Step 4. Compare the actual freeze cycle suction temperature (Step 3) to the published freeze cycle time and temperature comparison (Step 2B). Determine if the suction temperature is high, low or acceptable. Example: In this example, the suction temperature is considered high throughout the freeze cycle.
  • Page 75 Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensables in system Other • Non-Manitowoc components in system • Hot gas valve leaking • TXV flooding (check bulb mounting) • Defective compressor Part Number STH039 8/13...
  • Page 76 Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Manitowoc components in system • Improper water supply over evaporator refer to “Water System Checklist” on page 53. • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 77: 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 78 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 STH039 8/13...
  • Page 79 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 hot gas valve(s). Important Feeling the hot gas valve outlet or across the hot gas valve itself will not work for this comparison.
  • Page 80 Findings Comments The inlet of the harvest This is normal as the valve is cool enough to discharge line should touch and the compressor always be too hot to touch discharge line is hot. and the harvest valve inlet, although too hot to touch Cool &...

  • Page 81: Comparing Evaporator Inlet/Outlet Temperatures

    The temperature 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 82: 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 83 Discharge Line Temperature Above 66°C at End of Freeze Cycle: Ice machines that are operating normally will have consistent maximum discharge line temperatures above 66°C. Verify the expansion valve sensing bulb is positioned and secured correctly. Discharge Line Temperature Below 66°C at End of Freeze Cycle Ice machines that have a flooding expansion valve will have a maximum discharge line temperature that...

  • Page 84: Refrigeration Component Diagnostic Chart

    REFRIGERATION COMPONENT DIAGNOSTIC CHART All electrical and water related problems must be corrected before these charts will work properly. These tables must be used with charts, checklists and other references to eliminate refrigeration components not listed and external items and problems that will cause good refrigeration components to appear defective.
  • Page 85 PROCEDURE Step 1 Complete each item individually in the “Operational Analysis” column. Enter check marks (✓) in the boxes. Each time the actual findings of an item in the “Operational Analysis” column matches the published findings on the table, enter a check mark. Example: Freeze cycle suction temperature is determined to be low.

  • Page 86: Final Analysis

    FINAL ANALYSIS The column with the highest number of check marks identifies the refrigeration problem. Column 1 – Hot Gas Valve Leaking A leaking hot gas valve must be replaced. Column 2 – Low Charge/TXV Starving Normally, a starving expansion valve only affects the freeze cycle temperatures, not the harvest cycle temperatures.

  • Page 87: Refrigeration Component Diagnostic Chart

    REFRIGERATION COMPONENT DIAGNOSTIC CHART SINGLE EXPANSION VALVE SELF CONTAINED AIR COOLED CONDENSER Operational Analysis Ice Production Air-Temperature Entering Condenser_____________ Water Temperature Entering Ice Machine_________ Published 24 hour ice production________________ Calculated (actual) ice production_______________ NOTE: The ice machine is operating properly if the ice fill patterns is normal and ice production is within 10% of charted capacity.
  • Page 88 SINGLE EXPANSION VALVE SELF CONTAINED AIR COOLED CONDENSER Operational Analysis Suction Line Temperature Normal or High Normal or High Normal or High 3 minutes into the freeze cycle Freeze Cycle If suction temperature is High or Low refer to freeze cycle high or low suction temperature problem checklist page 67 to eliminate problems and/or components not listed on this table before proceeding.
  • Page 89 SINGLE EXPANSION VALVE SELF CONTAINED AIR COOLED CONDENSER Operational Analysis Wait 5 minutes into the The harvest valve inlet is The harvest valve inlet The harvest valve inlet The harvest valve inlet is Cool enough to hold freeze cycle. is Cool enough to hold is Cool enough to hold -and- hand on...
  • Page 90 This Page Intentionally Left Blank Part Number STH039 8/13...

  • Page 91: 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 The main fuse is 250 Volt, 10 amp. Warning High (line) voltage is applied to the control board at all times.

  • Page 92: Bin Switch

    Bin Switch 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 93 Ohm Test 1. Disconnect the bin switch wires to isolate the bin switch from the control board. 2. Connect an ohmmeter to the disconnected bin switch wires. 3. Cycle the bin switch open and closed numerous times by opening and closing the water curtain. NOTE: To prevent misdiagnosis: •...
  • Page 94 Bin Switch Removal 1. Disconnect power to the ice machine at service disconnect. 2. Disconnect bin switch wires in control box. 3. Insert a small screwdriver through the hole located in the top of the bin switch, and depress mounting tab slightly. 4.

  • Page 95: Diagnosing Start Components

    Diagnosing Start Components If the compressor attempts to start, or hums and trips the overload protector, check the start components before replacing the compressor. CAPACITOR Visual evidence of capacitor failure can include a bulged terminal end or a ruptured membrane. Do not assume a capacitor is good if no visual evidence is present.

  • Page 96: On/Off/Wash Toggle Switch

    ON/OFF/WASH Toggle Switch Function The switch is used to place the ice machine in ON, OFF or WASH mode of operation. Specifications Single-pole, double-throw switch. The switch is connected into a varying low D.C. voltage circuit. Check Procedure NOTE: Because of a wide variation in D.C. voltage, it is not recommended that a voltmeter be used to check toggle switch operation.

  • Page 97: Ice Thickness Probe

    Ice Thickness Probe How The Probe Works Manitowoc’s electronic sensing circuit does not rely on refrigerant temperature, evaporator temperature, water levels or timers to produce consistent ice formation. As ice forms on the evaporator, water (not ice) contacts the ice thickness probe. After the water completes this circuit across the probe continuously for 6-10 seconds, a harvest cycle is initiated.

  • Page 98: Ice Thickness Check

    ICE THICKNESS CHECK The ice thickness probe is factory-set to maintain the ice bridge thickness at 3 mm. NOTE: Make sure the water curtain is in place when performing this check. It prevents water from splashing out of the water trough. 1.

  • Page 99: 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 49°C) to ensure that the overload is closed and the resistance readings will be accurate.
  • Page 100 Check Motor Windings to Ground Check continuity between all three terminals and the compressor shell or copper refrigeration line. Scrape metal surface to get good contact. 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.

  • Page 101: Fan Cycle Control

    13.78 bar ±.34 10.34 bar ±.34 Q210 13.78 bar ±.34 10.34 bar ±.34 Q270 Check Procedure Disconnect electrical power to the ice machine at the electrical service disconnect. Verify fan motor windings are not open or grounded, and fan spins freely.

  • Page 102: High Pressure Cutout (Hpco) Control

    High Pressure Cutout (HPCO) Control 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 24.13 ±.69 bar Cut-out: Cut-in: Automatic reset (Must be below 17.23 bar to reset). Check Procedure 1.

  • Page 103: Liquid Line Filter-Driers

    Liquid Line 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.

  • Page 104: Refrigerant Recovery/Evacuation

    Refrigerant Recovery/Evacuation RECOVERY AND RECHARGING PROCEDURES Requirements and procedures vary by location. Follow your local laws governing the recovery, evacuation and charging of equipment that contains propane refrigerant. Part Number STH039 8/13...

  • Page 105: Q270 Condenser Fan Motor Replacement

    Q270 Condenser Fan Motor Replacement Access to remove, clean or replace the condenser fan/ motor can be obtained by performing the following: 1. Disconnect electrical power to the ice machine at the electrical service disconnect. 2. Remove the screws that secure the condenser to the cabinet and the base to the cabinet.
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  • Page 107: Component Specifications

    Component Specifications Main Fuse Volt Q210/Q270 Bin Switch Bin switch operation is controlled by the movement of the ice damper. ON/OFF/WASH Toggle Switch Single-pole, double-throw switch. The switch is connected into a varying low D.C. voltage circuit. Fan Control Cycle...

  • Page 108: High Pressure Cutout (Hpco) Control

    This information is for reference only. Refer to the ice machine serial number tag to verify the system charge. Serial plate information overrides information listed on this page. Model Air-Cooled Refrigerant Type Q210 130 grams R290 Q270 130 grams R290 Part Number STH039 8/13...

  • Page 109: Cycle Times, 24 Hr. Ice Production And Refrigerant Temperature Charts

    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. • Beginning temperatures are taken 1 minute after the water pump energizes.

  • Page 110: Q210 Self-Contained Air-Cooled

    Q210 SELF-CONTAINED AIR-COOLED CYCLE TIMES Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Entering Harvest Water Temperature °C/°F Condenser Time °C/°F 10°C/50°F 21°C/70°F 32°C/90°F 21°C/70°F 14.8-16.9 17.5-19.9 19.8-22.5 27°C/80°F 16.5-16.9 19.8-22.5 22.7-25.8 1-2.5 32°C/90°F 18.6-21.1 22.7-25.8 26.6-30.2 38°C/100°F...

  • Page 111: Q270 Self-Contained Air-Cooled

    Q270 SELF-CONTAINED AIR-COOLED CYCLE TIMES Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Entering Harvest Water Temperature °C/°F Condenser Time °C/°F 10°C/50°F 21°C/70°F 32°C/90°F 21°C/70°F 11.0-12.6 12.6-14.3 13.8-15.7 27°C/80°F 12.0-13.7 13.8-15.7 15.2-17.4 1-2.5 32°C/90°F 13.1-15.0 15.6-17.8...
  • Page 112 This Page Intentionally Left Blank Part Number STH039 8/13...

  • Page 113: 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. Wiring Diagram Legend The following symbols are used on all of the wiring diagrams: Internal Compressor Overload (Some models have external compressor...

  • Page 114: Q210

    Q210 L2 (N) NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) (24) BIN SWITCH ICE THICKNESS (23) WASH TOGGLE SWITCH (20) CONTROL BOARD (21) (10) SWITCH (11) LIGHT HARVEST LIGHT CONTACTOR COIL HOT GAS SOLENOID FUSE TRANS.

  • Page 115: Q270

    Q270 NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) (22) TOGGLE SWITCH (24) BIN SWITCH WASH ICE THICKNESS (23) (20) CONTROL BOARD (21) (11) SWITCH LIGHT (10) (GREEN) HARVEST LIGHT (RED) RELAY HOT GAS...

  • Page 116: Electronic Control Boards

    Electronic Control Boards DC LOW VOLTAGE ICE THICKNESS ELECTRICAL PLUG PROBE BIN SWITCH LIGHT HARVEST LIGHT AC LINE VOLTAGE ELECTRICAL PLUG 10 AMP FUSE Part Number STH039 8/13...

  • Page 117: Tubing Schematic

    Tubing Schematic EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER STRAINER DRIER COMPRESSOR Part Number STH039 8/13...
  • Page 118 This Page Intentionally Left Blank Part Number STH039 8/13...
  • Page 120 Manitowoc Ice © 2012 Manitowoc 2110 South 26th Street, P.O. Box 1720 Part Number STH039 8/13 Manitowoc, WI 54221-1720, USA Ph: 001-920-682-0161 Fax: 001-920-683-7589 Visit us online at: www.manitowocfsg.com...

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Q210

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