Manitowoc SM050 Technician's Handbook
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Manitowoc SM050 Technician's Handbook

Undercounter ice machines
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Undercounter Ice Machines
QM20 / QM30 / QM45 / SM050
Q130 / Q170 / Q210 / Q270
Technicians Handbook
Part Number 8001119 10/19

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Summary of Contents for Manitowoc SM050

  • Page 1 Undercounter Ice Machines QM20 / QM30 / QM45 / SM050 Q130 / Q170 / Q210 / Q270 Technicians Handbook Part Number 8001119 10/19...
  • Page 3 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 4 ! Caution Proper installation, care and maintenance are essential for maximum performance and trouble- free operation of your Manitowoc equipment. If you encounter problems not covered by this handbook, do not proceed, contact Manitowoc Foodservice Group. We will be happy to provide assistance.

  • Page 5: Table Of Contents

    Bin Caster ..... . 12 Manitowoc Cleaner and Sanitizer ..12 Model/Serial Number Location ..14 Q130/Q170/Q210/Q270 .
  • Page 6 MAINTENANCE Ice Machine Inspection ....43 Exterior Cleaning ....43 Cleaning the Condenser .
  • Page 7 Operational Checks ....89 QM45/Q130/Q170/Q210/Q270 ..89 QM20/QM30 ....92 SM50 .
  • Page 8 SM50 ......144 Diagnosing an Ice Machine that Will Not Run ....144 Ice Machine Will Not Harvest .
  • Page 9 Compressor Electrical Diagnostics ..176 Check Resistance (Ohm) Values ..176 Single Phase Compressors ..176 Check Motor Windings to Ground ..176 Compressor Drawing Locked Rotor .
  • Page 10 CHARTS Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts ..203 QM20 Self-contained Air-cooled ..204 QM30 Self-contained Air-cooled ..205 QM45 Self-contained Air-cooled .

  • Page 11: General Information

    General Information Model Numbers This manual covers the following models: Self-contained Self-contained Air-cooled Water-cooled QM20A* QM30A* QM45A* SM50A QR0130A QR0131W QD0132A QD0133W QY0134A QY0135W QD0172A QY0174A QR0210A QR0211W QD0212A QD0213W QY0214A QY0215W QR0270A QR0271W QD0272A QD0273W QY0274A QY0275W *QM Models – the suffix E represents 230 volt/1 ph/50 hz machine. Warning An ice machine contains high voltage electricity and refrigerant charge.

  • Page 12: How To Read A Model Number

    3 - Dice, Water-cooled Y - Half-dice 4 - Half-dice, Air-cooled 5 - Half-dice, Water-cooled Accessories Contact your Manitowoc distributor for these optional accessories: BIN CASTER Replaces standard legs. MANITOWOC CLEANER AND SANITIZER Manitowoc Ice Machine Cleaner and Sanitizer are available in convenient 16 oz.
  • Page 13 ! 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 14: 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 15: Qm20/Qm30

    QM20/QM30 MODEL/SERIAL NUMBER PLATE MODEL/SERIAL NUMBER PLATE SV1599 QM45 MODEL/SERIAL NUMBER PLATE MODEL/SERIAL NUMBER PLATE SV1732 Part Number 8001119 10/19...
  • Page 16 SM50 MODEL/SERIAL NUMBER PLATE Part Number 8001119 10/19...

  • Page 17: Ice Machine Warranty Information

    REGISTRATION CARD as soon as possible to validate the installation date. 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 18 2. Repairs due to unauthorized modifications to the ice machine or use of non-standard parts without prior written approval from Manitowoc Ice. 3. Damage caused by improper installation of the ice machine, electrical supply, water supply or drainage, or damage caused by floods, storms, or other acts of God.
  • Page 19 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 20: 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 21 IN NO EVENT SHALL MANITOWOC OR ANY OF ITS AFFILIATES BE LIABLE TO THE CONSUMER OR ANY OTHER PERSON FOR ANY INCIDENTAL,...
  • Page 22 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 23: 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 24: 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)* *NOTE: The ice machine may be built into a cabinet. There is no minimum clearance requirement for the top or left and right sides of the ice machine.

  • Page 25: Leveling The Ice Machine

    Leveling the Ice Machine QM45/Q130/Q170/Q210/Q270 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.

  • Page 26: Sm50/Qm20/Qm30

    SM50/QM20/QM30 After moving the ice machine into the installation location, it must be leveled for proper operation. Follow these steps to level the ice machine: 1. Use a level to check the levelness of the ice machine from front to back and from side to side. 2.

  • Page 27: 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). The 115/1/60 ice machines are factory pre-wired with a 6' (1.8 m) power cord, and NEMA 5-15P-plug configuration.

  • Page 28: Electrical Specifications

    Electrical Specifications Q130/Q170/Q210/Q270 Air-cooled Ice Machine Max. Fuse/ Voltage Total Ice Machine Circuit Phase Cycle Amps Breaker 115/1/60 15 amp Q130 (Before 208-230/1/60 15 amp Serial Number 310047287) 230/1/50 15 amp 115/1/60 15 amp Q130 (After 208/1/60 15 amp Serial Number 310047287) 230/1/50 15 amp...
  • Page 29 Q130/Q210/Q270 Water-cooled Ice Machine Max. Fuse/ Voltage Total Ice Machine Circuit Phase Cycle Amps Breaker 115/1/60 15 amp Q130 (Before 208-230/1/60 15 amp Serial Number 310047287) 230/1/50 15 amp 115/1/60 15 amp Q130 (After 208/1/60 15 amp Serial Number 310047287) 230/1/50 15 amp 115/1/60...
  • Page 30 QM20/QM30/QM45 Air-cooled Ice Machine Max. Fuse/ Voltage Phase Total Circuit Machine Cycle Amps Breaker 115/1/60 15 amp QM20 230/1/50 15 amp 115/1/60 15 amp QM30 230/1/50 15 amp 115/1/60 15 amp QM45 230/1/50 15 amp SM50 Air-cooled Ice Machine Max. Fuse/ Voltage Phase Total Circuit...

  • Page 31: Water Service/Drains

    Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste. 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.

  • Page 32: Cooling Tower Applications

    COOLING TOWER APPLICATIONS Water Cooled Models Only A water-cooling tower installation does not require modification of the ice machine. The water regulator valve for the condenser continues to control the refrigeration discharge pressure. It is necessary to know the amount of heat rejected, and the pressure drop through the condenser and water valves (inlet to outlet) when using a cooling tower on an ice machine.
  • Page 33 WATER SUPPLY AND DRAIN LINE SIZING/ CONNECTIONS QM45/Q130/Q170/Q210/Q270 Part Number 8001119 10/19...
  • Page 34 QM20/QM30 Part Number 8001119 10/19...
  • Page 35 SM50 Part Number 8001119 10/19...
  • Page 36 This Page Intentionally Left Blank Part Number 8001119 10/19...

  • Page 37: Component Identification

    Component Identification QM45/Q130/Q170/Q210/Q270 ICE THICKNESS PROBE DISTRIBUTION TUBE (Q210/Q270 SHOWN) EVAPORATOR (Q210/Q270 SHOWN) DAMPER WATER WATER PUMP TROUGH SV1694A FLOAT VALVE SIPHON CAP BIN SWITCH MAGNET SV1695A Evaporator Compartment Part Number 8001119 10/19...
  • Page 38 ON/OFF/WASH TOGGLE SWITCH COMPRESSOR CONDENSER AIR COMPARTMENT FILTER ACCESS SCREWS SV1686G QM45/Q130/Q170/Q210 Ice Machines ON/OFF/WASH TOGGLE SWITCH CONDENSER AIR FILTER COMPRESSOR COMPARTMENT ACCESS SCREWS PT1288 Q270 Ice Machines Part Number 8001119 10/19...

  • Page 39: Qm20/Qm30

    QM20/QM30 WATER DISTRIBUTION TUBE WATER PUMP BRACKET ASSEMBLY WATER PUMP OUTLET HOSE OVERFLOW EVAPORATOR TUBE ASSEMBLY WATER TROUGH SV1716A Part Number 8001119 10/19...
  • Page 40 ON/OFF/WASH TOGGLE SWITCH SV1711 QM20 Ice Machines CONDENSER AIR FILTER ON/OFF/WASH TOGGLE SWITCH SV1681A QM30 Ice Machines Part Number 8001119 10/19...

  • Page 41: Sm50

    SM50 CONTROL BIN LIGHT PANEL WATER SHUTTERS EVAPORATOR COMPARTMENT THERMOSTAT WATER FILTER GRILL WATER PUMP REFRIGERATION ELECTRICAL COMPRESSOR DRAIN PUMP WATER INLET DRAIN Part Number 8001119 10/19...
  • Page 42 WATER PUMP EVAPORATOR WATER SHUTTER ASSEMBLY WATER SUPPLY LINE NOTE: SPRAY EVAPORATOR REMOVED FOR CLARITY SPRAY NOZZLES EVAPORATOR WATER BUCKET SHUTTERS CONTROL BOARD Part Number 8001119 10/19...

  • Page 43: Ice Machine Inspection

    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 44: Air-Cooled Condenser

    AIR-COOLED 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. Warning The condenser fins are sharp. Use care when cleaning them.

  • Page 45: Qm45/Q130/Q170/Q210/Q270

    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 46 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 QM45 1.5 ounce (45 ml)
  • Page 47 Step 6 Remove parts for cleaning. A. Remove Two Thumbscrews and Water Pump Cover (When Used). B. Remove the Vinyl Hose Connecting the Water Pump and Water Distribution Tube C. Remove Water Pump • Disconnect the water pump power cord •...
  • Page 48 Ice Thickness Probe Cleaning • Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of water) in a container. •...
  • Page 49 E. Remove the Water Distribution Tube Q170/Q210/Q270 Models 1. LIFT UP 2. SLIDE BACK 3. SLIDE TO RIGHT DISTRIBUTION THUMB TUBE SCREW THUMB SCREW SV1630 Q170/Q210/Q270 Water Distribution Tube Removal • Loosen the two thumbscrews, which secure the distribution tube. •...
  • Page 50 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 Q210/Q270 Water Distribution Tube Disassembly Part Number 8001119 10/19...
  • Page 51 Q130 Models DISTRIBUTION TUBE THUMBSCREW REMOVE ICE THUMBSCREW THICKNESS PROBE SV1731C Q130 Water Distribution Tube Removal • 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 keyway.
  • Page 52 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 53 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 54 Q130 • 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. STEP 1 STEP 2 SV1731F Installation • Grasp the right side of ice damper and place left hand pin in the mounting bracket.
  • Page 55 Q170/Q210/Q270 • 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 SV1742A...
  • Page 56 Remove the Bin Door • Grasp the rear of the bin door and pull bin door forward approximately 5". • 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 57 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 58 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 QM45 1.5 ounces (45 ml)
  • Page 59 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 60: Qm20/Qm30

    QM20/QM30 CLEANING AND SANITIZING PROCEDURE ! Caution Use only Manitowoc approved Ice Machine Cleaner (part number 94-0546-3) Sanitizer (part number 94-0565-3). 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 61 Step 3 To start a cleaning cycle, move the toggle switch to the WASH position. Step 4 Wait until water flows over the evaporator (about three minutes) then add the proper amount of Manitowoc Ice Machine Cleaner to the water trough. Model Amount of Cleaner QM20/QM30...
  • Page 62 Step 6 Remove parts for cleaning. A. Remove the Overflow Tube • To remove the tube, lift it up while using a slight back and forth motion to loosen it from the drain hole. When installing the tube, be sure it is completely inserted into the drain hole to prevent water leakage during normal operation.
  • Page 63 C. Remove the Water Pump • Disconnect the water pump power cord. • Loosen the screws that hold the water pump in place. • Lift the water pump and bracket assembly up and off the screws. SCREWS WATER PUMP Removing the Water Pump D.
  • Page 64 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 Type Water Mixed with...
  • Page 65 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. Step 15 Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough. Model...
  • Page 66 Step 20 Use half of the sanitizer/water solution to sanitize all foodzone surfaces of the ice machine and bin. Use a cloth or sponge to liberally apply the solution. When sanitizing, pay particular attention to the following areas: • Evaporator plastic parts - including top, bottom and sides •...

  • Page 67: Sm50

    4. Wait until the Clean light flashes (3 minutes) then add 3 oz of Manitowoc cleaner by lifting the water shutter and pouring directly into the spray area. The ice machine will automatically time out a ten minute cleaning cycle, followed by eight rinse cycles, and stop.

  • Page 68: Sanitizing Procedure

    5. When the cleaning process stops, remove all parts as described in Removal of Parts for Cleaning and Sanitizing. 6. Mix 16 oz (480 ml) cleaner with 1 gal (4 L) of warm water in a non metallic container.- 7. Take all components to sink for cleaning. Use 1/2 of the Cleaner/Water mixture and clean all components with a soft nylon brush or cloth.

  • Page 69: Removal Of Parts For Cleaning And Sanitizing

    6. Wait until the Clean light flashes (3 minutes) then add 0.5 oz (15 ml) of Manitowoc sanitizer by lifting the water shutter and pouring directly into the spray area. The ice machine will automatically time out a ten minute cleaning cycle, followed by eight rinse cycles, and stop.
  • Page 70 3. To re-install into ice machine, grasp one end of the water shutters, install one end, pivot the opposite end and pull down into position. Make sure tabs are secure in grooves. To remove water shutter assembly: 1. Slide evaporator bucket forward 1/2" (13 mm). 2.
  • Page 71 ICE CHUTE The ice chute is positioned over the spray nozzles and allows the ice to easily fall into the bin. It must be firmly positioned over the spray bar, with the front edge inside the water trough. Spray nozzles must align with the spray holes or spray water will fall into the bin.
  • Page 72 SUMP DRAIN OVERFLOW TUBE 1. Remove clamp. 2. Pull down to remove overflow tube and tubing as an assembly. The sump trough water will drain into the bin. 3. Remove overflow tube from vinyl tubing by pulling. REMOVE CLAMP PULL DOWN Part Number 8001119 10/19...
  • Page 73 WATER TROUGH 1. Depress tabs on right and left side of the water trough. 2. Allow front of water trough to drop as you pull forward to disengage the rear pins. Part Number 8001119 10/19...
  • Page 74 SPRAY BAR, WATER PUMP AND HOSE Warning Disconnect the electric power to the ice machine at the electric service switch box and turn off the water supply before proceeding. Remove spray bar clamp and spray bar. 1. Grasp pump and pull straight down until water pump disengages and electrical connector is visible.
  • Page 75 SPRAY BAR DISASSEMBLY The spray bar supplies water to the individual ice making cups. Water from the water pump sprays through the nozzles, located on the upper portion of the tubes. 1. Grasp one end of the spray bar, lift up and remove from seat formed in evaporator bucket.
  • Page 76 Warning Wear rubber gloves and safety goggles (and/or face shield) when handling Ice Machine Cleaner or Sanitizer. 6. Soak the removed part(s) in a properly mixed solution. Solution Water Mixed With Type 16 oz (500 ml) Cleaner 1 gal (4 l) cleaner 4 oz (120 ml) Sanitizer...

  • Page 77: 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 32°F (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 78: Water-Cooled Ice Machines

    WATER-COOLED ICE MACHINES 1. Perform steps 1-6 under “Self-contained Air- cooled Ice Machines” on page 77. 2. Disconnect the incoming water and drain lines from the water-cooled condenser. 3. Insert a large screwdriver between the bottom spring coils of the water regulating valve. Pry upward to open the valve.

  • Page 79: Operation

    Operation QM45/Q130/Q170/Q210/Q270 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 80: 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 81: Energized Parts Chart

    ENERGIZED PARTS CHART Q130/Q170/Q210/Q270/QM45 Self-Contained Ice Machines * Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control; therefore, it may cycle on and off. Part Number 8001119 10/19...
  • Page 82 Part Number 8001119 10/19...

  • Page 83: Qm20/Qm30

    QM20/QM30 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF Water Purge The water fill valve and the hot gas valve are energized for 2.9 minutes (175 seconds). This ensures that the ice making cycle starts with fresh water, and that the refrigerant pressures are equalized prior to refrigeration system start-up.

  • Page 84: Harvest Sequence

    HARVEST SEQUENCE Harvest Cycle The condenser fan motor and water pump de- energize. The water fill valve energizes to purge the water in the water trough. The hot gas valve also energizes at the beginning of the harvest cycle to divert hot refrigerant gas into the evaporator.

  • Page 85: Energized Parts Chart

    ENERGIZED PARTS CHART QM20/QM30 Self-Contained Ice Machines Part Number 8001119 10/19...

  • Page 86: Sm50

    SM50 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF Sequence of Operation Bin thermostat and the optional drain pump safety switch must be closed before the ice machine will start. Initial Start-up or Start-up After Automatic Shut-off – Water Fill Before the compressor starts, the water pump, water inlet valve and hot gas valve are energized for about 3 minutes.
  • Page 87 Harvest The water pump de-energizes and the water inlet valve energizes to assist harvest and refill the water sump. The hot gas valve opens and the refrigerant gas warms the evaporator allowing the cubes to release from the evaporator and drop into the storage bin. The control system automatically determines: •...

  • Page 88: Energized Parts Chart

    ENERGIZED PARTS CHART SM50 Self-contained Ice Machines * Liquid line thermistor determines the length of the freeze and harvest cycles. Liquid line temperature also determines fan motor operation during the harvest cycle. Part Number 8001119 10/19...

  • Page 89: Operational Checks

    Operational Checks QM45/Q130/Q170/Q210/Q270 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 90 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 91 ADJUSTING SCREW 1/8" ICE BRIDGE THICKNESS SV3114 SV3113 Ice Thickness Adjustment 2. Make sure the ice thickness probe wire and bracket does not restrict movement of the probe. Part Number 8001119 10/19...

  • Page 92: Qm20/Qm30

    QM20/QM30 Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty. Water Inlet Valve The water inlet valve energizes in the harvest cycle. The water level will rise and flow out the overflow tube and down the drain. Verify the overflow tube is in place in the water trough.
  • Page 93 Ice Thickness Check QM20/QM30 dice ice cube formation is slightly different from our previous models. Manitowoc ice machines have a unique cube shape. It is normal to have a dimple in the ice cube (a concave indentation in the cube). Ice cubes from the QM20/QM30 may appear to have a slightly larger dimple than other Manitowoc ice cube machines.
  • Page 94 Repeat steps 1 – 3. After completing the procedure above, if you are unable to obtain a sheet of ice weighing 7 – 9 oz (200 – 270 g) contact the Manitowoc Service Department for further assistance. Part Number 8001119 10/19...

  • Page 95: Sm50

    SM50 Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty Water Inlet Valve The water inlet valve energizes in the harvest cycle. The water level will rise and flow out the overflow tube and down the drain. Verify the overflow tube is in place in the water trough.

  • Page 96: Delay Start

    Delay Start Pressing the “Delay Start” button will initiate a delay cycle. The ice machine will not run until the delay time expires. • Pressing the button once will energize the 2 hour light and initiate a two hour delay period. •...
  • Page 97 6 times will reset the finishing time to zero additional minutes. REPLACE WATER FILTER DELAY POWER CLEAN START AUTOMATIC TO RESET: HOURS PUSH AND HOLD CLEAN MAKING BUTTON FOR 6 SECONDS SM050 Control Panel SM050 Ice Cube Part Number 8001119 10/19...
  • Page 98 This Page Intentionally Left Blank Part Number 8001119 10/19...

  • Page 99: Troubleshooting

    Troubleshooting QM45/Q130/Q170/Q210/Q270 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #2 and #4) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.

  • Page 100: 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 101 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 102 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 103: 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 8001119 10/19...

  • Page 104: 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 105: 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 106: 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 107 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 108: 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 109 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 110 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 111 Eliminate all electrical components and external causes first. If it appears that the refrigeration system is causing the problem, use Manitowoc’s Refrigeration System Operational Analysis Table, along with detailed charts, checklists, and other references to determine the cause.
  • Page 112 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 113 Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensable in refrigeration system • Plugged or restricted high side refrigerant lines or component • Defective hot gas valve...
  • Page 114 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 115: Analyzing Discharge Pressure

    ANALYZING DISCHARGE PRESSURE Q130/Q170/Q210/Q270 Ice Machines Only 1. Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough ______ 2. Refer to “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts”...
  • Page 116 • 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 Pressure Low Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist”...

  • Page 117: Analyzing Suction Pressure

    ANALYZING SUCTION PRESSURE Q130/Q170/Q210/Q270 Ice Machines Only 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...
  • Page 118 Procedure Step 1. Determine the ice machine operating conditions. Example: Air temp. entering condenser: 90°F/32.2°C Air temp. around ice machine: 80°F/26.7°C Water temp. entering water fill valve: 70°F/21.1°C 2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice machine model being checked. Using operating conditions from Step 1, determine published freeze cycle time and published freeze cycle suction pressure.
  • Page 119 High Checklist” on page 150. 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 8001119 10/19...
  • Page 120 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 105. • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 121: 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 122 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 8001119 10/19...
  • Page 123 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 124 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 125: Comparing Evaporator Inlet/Outlet Temperatures

    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 126: Discharge Line Temperature Analysis

    DISCHARGE LINE TEMPERATURE ANALYSIS Q130/Q170/Q210/Q270 Ice Machines Only 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.
  • Page 127 Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle: Ice machines that are operating normally will have consistent maximum 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 maximum discharge line temperature that...

  • Page 128: Refrigeration Component Diagnostic Chart

    REFRIGERATION COMPONENT DIAGNOSTIC CHART Q130/Q170/Q210/Q270 Ice Machines Only 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 129 PROCEDURE Step 1 Complete each item individually in the “Operational Analysis” column. Enter check marks (3) 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 pressure is determined to be low.

  • Page 130: 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 pressures, not the harvest cycle pressures.

  • Page 131: Refrigeration Component Diagnostic Chart

    REFRIGERATION COMPONENT DIAGNOSTIC CHART Q130/Q170/Q210/Q270 Ice Machines Only Part Number 8001119 10/19...
  • Page 132 Q130/Q170/Q210/Q270 Ice Machines Only (continued) Part Number 8001119 10/19...
  • Page 133 Q130/Q170/Q210/Q270 Ice Machines Only (continued) Part Number 8001119 10/19...

  • Page 134: Qm20/Qm30

    QM20/QM30 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #8 and #2) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.

  • Page 135: Refrigeration Diagnostics

    Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill pattern. Clean with Manitowoc Ice Machine cleaner to remove any mineral build- up before entering the refrigeration system. The following can be used for diagnostics: Capillary Tube failures or low refrigerant charge will always result in a starving evaporator.
  • Page 136 Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill pattern. Clean with Manitowoc Ice Machine cleaner to remove any mineral build- up before entering the refrigeration system. The following can be used for diagnostics: Capillary Tube failures or low refrigerant charge will always result in a starving evaporator.

  • Page 137: 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 138 Ice Production Check The QM20/QM30 dice ice cube formation is slightly different from our previous models. Manitowoc ice machines have a unique cube shape. It is normal to have a dimple in the ice cube (a concave indentation in the cube). Ice cubes from the QM20/QM30 may appear to have a slightly larger dimple than other Manitowoc ice cube machines.

  • Page 139: Qm45

    QM45 ELECTRICAL The QM45 electrical sequence of Operation and troubleshooting is identical to the Q130/Q210/Q270. Refer to those models for electrical troubleshooting of: • Ice machine will not run • Diagnosing Ice Thickness Control Circuitry • Ice production check • Ice formation pattern •...

  • Page 140: Refrigeration Diagnostics

    REFRIGERATION DIAGNOSTICS Important: • DO NOT install a manifold gauge set on the ice machine! Refrigerant pressures are not used to diagnose this ice machine. • If the ice machine is “slushing” remove the screen from the bottom of the water pump. •...
  • Page 141 3. Verify that the ice thickness probe is properly adjusted. ADJUSTING SCREW 1/8" ICE BRIDGE THICKNESS SV3114 SV3113 Ice Thickness Adjustment 4. Verify that the machine has properly sized drain line leaving the machine and that the bin drain is not restricted.
  • Page 142 5. Install thermometer thermocouples on Suction and Discharge line: • Digital thermometers with remote thermocouples must be used to obtain temperatures • Suction and Discharge line thermocouples must be within 3" (76.2 mm) of the compressor • Thermocouples must be insulated •...

  • Page 143: Flooding Expansion Valve

    FLOODING EXPANSION VALVE A flooding expansion valve will have discharge and suction line temperatures 20°F (-7°C) lower than normal freeze cycle temperatures. Normal suction line temperature and low discharge line temperature DO NOT verify a flooding valve. Both discharge line temperature and suction line temperature must be low to verify a flooding expansion valve.

  • Page 144: Sm50

    SM50 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #20 and #21) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.

  • Page 145: Ice Machine Will Not Harvest

    ICE MACHINE WILL NOT HARVEST 1. Verify cubes are present in evaporator and freeze time exceeds freeze chart cycle time. • Initial freeze cycle after resetting at toggle switch will be 5 minutes longer than chart time (refer to “Sequence of Operation” on page 86). •...

  • Page 146: Ice Quality Is Poor - Cubes Are Shallow, Incomplete Or White

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

  • Page 147: Freeze Cycle Is Long, Low Ice Production

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

  • Page 148: Ice Machine Runs And No Ice Is Produced

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

  • Page 149: Analyzing Discharge Pressure

    ANALYZING DISCHARGE PRESSURE 1. Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough ______ 2. Refer to “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 203 for ice machine being checked.

  • Page 150: Discharge Pressure High Checklist

    • 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 PRESSURE LOW CHECKLIST Improper Installation • Refer to “Installation and Visual Inspection Checklist”...

  • Page 151: 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 152 Procedure Step 1. Determine the ice machine operating conditions. Example: Air temp. entering condenser: 90°F/32.2°C Air temp. around ice machine: 80°F/26.7°C Water temp. entering water fill valve: 70°F/21.1°C 2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice machine model being checked. Using operating conditions from Step 1, determine published freeze cycle time and published freeze cycle suction pressure.
  • Page 153 Improper Refrigerant Charge • Overcharged • Wrong type of refrigerant • Non-condensables in system Other • Non-Manitowoc components in system • Hot gas valve leaking • Defective compressor • Water inlet valve leaking Suction Pressure Low Checklist Improper Installation •...

  • Page 154: Hot Gas Valve

    Other • Non-Manitowoc components in system • Improper water supply over evaporator refer to “Water System Checklist” on page 105. • Loss of heat transfer from tubing on back side of evaporator • Restricted/plugged liquid line drier • Restricted/plugged tubing in suction side of...
  • Page 155 Hot Gas Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. Valve Will Not Open in the Harvest Cycle Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
  • Page 156 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 157 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 (21.2°C) ambient temperature and 50°F (10.0°C) water produces more ice than the same ice machine with 90°F (32.2°C) ambient and 70°F (21.2°C) water.
  • Page 158 ADJUSTING CUBE WEIGHT The cube weight can be increased from the factory setting by adjusting the finish time. ADDITIONAL FINISHING TIME CHECK Press and hold the power button for 5 seconds. • Count the flashes on the Automatic Ice Making light.

  • Page 159: 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 • QM20/QM30 The main fuse is 250 Volt, 8 amp. • QM45/SM50/Q130/Q170/Q210/Q270 The main fuse is 250 Volt, 10 amp. Warning High (line) voltage is applied to the control board at all times.

  • Page 160: Bin Switch

    Bin Switch QM45/Q130/Q170/Q210/Q270 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 161 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 162 Bin Switch Removal — QM45/Q130 1. Disconnect power to the ice machine at service disconnect. 2. Disconnect bin switch wires in control box. 3. Depress tab on right side of evaporator with thumb. 4. Slide bin switch to right to remove. 5.
  • Page 163 Bin Switch Removal — Q170/Q210/Q270 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.

  • Page 164: Bin Thermostat

    Bin Thermostat QM20/QM30 Function The bin thermostat stops the ice machine when the bin is full. The level of ice in the ice storage bin controls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens the bin thermostat to stop the ice machine.
  • Page 165 1. Remove the back panel to access the bin thermostat. 2. Disconnect both wires #12 and #1 from the bin thermostat and check the resistance across the bin thermostat terminals. No Ice on Bulb Ice on Bulb Result Closed (O) Open (OL) Thermostat good Open (OL)

  • Page 166: Sm50

    SM50 Function The bin thermostat stops the ice machine when the bin is full. It is preset for normal ambient temperatures and adjustments are usually not required. The level of ice in the ice storage bin controls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens the bin thermostat to stop the ice machine.
  • Page 167 Adjusting If the ice machine stops before the bin is full or runs after the bin is full, ambient temperatures are probably high or low and the bin thermostat can be adjusted as follows: Warning HAZARDOUS MOVING PARTS Power is supplied to ice machine during this procedure.
  • Page 168 Check Procedure Warning High (line) voltage is applied to the control board (terminals #20 and #21) at all times. Removing the control board fuse or depressing the power button will not remove the power supplied to the control board. Warning Disconnect electrical power to the entire ice machine before proceeding.

  • Page 169: Liquid Line Thermistor

    Use only Manitowoc thermistors. Check Procedure Thermistors generally fail because of moisture or physical damage. Manitowoc liquid line thermistors are encased in a specially designed, moisture-sealed aluminum block. This eliminates physical damage and moisture concerns. Verify that the thermistor resistance is accurate and corresponds to the high and low temperature ranges.
  • Page 170 Temperature/Resistance Chart As the temperature rises at the thermistor block, the resistance drops. Important If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad. Temperature of Thermistor Resistance °C °F K Ohms (x 1000) 15.6°...

  • Page 171: 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 172: 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 173: Qm45/Q130/Q170/Q210/Q270

    QM45/Q130/Q170/Q210/Q270 Switch Setting Terminals Ohm Reading 24-21 Open 24-20 Closed 20-21 Open 24-20 Open WASH 24-21 Closed 20-21 Open 24-20 Open 24-21 Open 20-21 Open Replace the toggle switch if ohm readings do not match all three-switch settings. QM20/QM30 Switch Setting Terminals Ohm Reading Open...

  • Page 174: Ice Thickness Probe

    Ice Thickness Probe QM45/Q130/Q170/Q210/Q270 How The Probe Works Manitowoc’s electronic sensing circuit does not rely on refrigerant pressure, 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 175: Ice Thickness Check

    ICE THICKNESS CHECK The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (3.2 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 176: 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 177: Compressor Drawing Locked Rotor

    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 gauges. 2. Try to start the compressor. 3. Watch the pressures closely. •...

  • Page 178: Fan Cycle Control

    Fan Cycle Control QM45/Q130/Q170/Q210/Q270 Function Cycles the fan motor on and off to maintain proper operating discharge pressure. The fan cycle control closes on an increase, and opens on a decrease in discharge pressure. Specifications Cut-In Cut-Out Model (Close) (Open) 145 psig 5 110 psig 5 QM45...

  • Page 179: High Pressure Cutout (Hpco) Control

    High Pressure Cutout (HPCO) Control QM45/Q130/Q170/Q210/Q270 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 450 psig 10 Cut-out: Cut-in: Automatic reset (Must be below 300 psig to reset).

  • Page 180: Filter-Driers

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

  • Page 181: 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 182: Refrigerant Re-Use Policy

    REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of CFC and HCFC 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 183 Compressor motor burnouts and improper past service prevent refrigerant re-use. • Refer to “System Contamination Cleanup” on page 190 to test for contamination. 5. “Substitute” or “Alternative” Refrigerant • Must use only Manitowoc-approved alternative refrigerants. • Must follow Manitowoc-published conversion procedures. Part Number 8001119 10/19...

  • Page 184: Recovery And Recharging Procedures

    Q130/Q170/Q210/Q270 Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice assumes no responsibility for the contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 185 Follow the Charging Procedures below. CHARGING PROCEDURES Important 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 toggle switch is in the OFF position.
  • Page 186 NOTE: Manifold gauges 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. A. Run the ice machine in freeze cycle. B.
  • Page 187 QM20/QM30/QM45 Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice assumes no responsibility for the contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 188 Important Manifold gauges must be removed properly to ensure that no refrigerant contamination or loss occurs. A quick disconnect is required for the high side connection unless high side valve has shut off. RECOVERY/EVACUATION 1. Place the toggle switch in the OFF position. 2.
  • Page 189 CHARGING PROCEDURES Important The charge is critical on all Manitowoc ice machines. Use a scale to ensure the proper charge is installed. A quick disconnect is required for the high side connection. 1. Be sure the toggle switch is in the OFF position.

  • Page 190: System Contamination Cleanup

    System Contamination Cleanup GENERAL This section describes the basic requirements for restoring contaminated systems to reliable service. Important Manitowoc Ice assumes no responsibility for the contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 191 Contamination/Cleanup Chart Required Symptoms/Findings Cleanup Procedure No symptoms or suspicion of Normal contamination evacuation/ recharging procedure Moisture/Air Contamination symptoms Mild Refrigeration system open to contamination atmosphere for longer than 15 minutes cleanup Refrigeration test kit and/or acid oil test procedure shows contamination No burnout deposits in open compressor lines...

  • Page 192: Mild System Contamination Cleanup Procedure

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

  • Page 193: Severe System Contamination Cleanup Procedure

    SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Remove the refrigerant charge. 2. Remove the compressor. 3. Disassemble the hot gas solenoid valve. If burnout deposits are found inside the valve, install a rebuild kit, and replace the TXV and head pressure control valve. 4.

  • Page 194: 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. • Fan cycle control • High pressure cut-out control •...
  • Page 195 FIG. A - “PINCHING OFF” TUBING FIG. B - RE-ROUNDING TUBING SV1406 Using Pinch Off Tool Part Number 8001119 10/19...

  • Page 196: 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.

  • Page 197: Brazing Procedures For Danfoss Valves

    Brazing Procedures for Danfoss Solenoid Valves • Danfoss stainless steel solenoid valves require a slightly different brazing technique than brass- bodied valves. Copper clad stainless steel does not require as much flame contact as copper tubing. Apply heat to the copper tubing first then the solenoid socket.
  • Page 198 MAX. 1300°F (700°C) SV3071 4. Apply heat to copper tubing first and move flame toward valve socket. A. Heat copper tubing for approximately 10 to 15 seconds then direct the heat to the solenoid socket. B. Heat the solenoid socket for 2 to 5 seconds and apply silver solder to joint.

  • Page 199: Component Specifications

    Component Specifications Main Fuse Volt QM20/QM30 QM45/SM50/ Q130/Q170/Q210/Q270 Bin Switch QM45/Q130/Q170/Q210/Q270 Bin switch operation is controlled by the movement of the ice damper. Bin Thermostat QM20/QM30/SM50 Control Setting Cut in: 40°F (4.5°C) Bin Thermostat Cut out: 34°F (1.0°C) ON/OFF/WASH Toggle Switch Single-pole, double-throw switch.

  • Page 200: High Pressure Cutout (Hpco) Control

    31 bar ±.69 Must be below 300 psig (2068 kPa, 20.68 bar) to reset. Filter-Driers Drier with dirt-retaining filtration. Liquid Line Thermistor QM20/QM30/SM50 10,000 Ohms ± 2% at 25°C (77°F) ! Caution Use only Manitowoc thermistors. Part Number 8001119 10/19...

  • Page 201: 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. Air- Water- Refrigerant Model Cooled Cooled Type 4.6 oz QM20 R134A...
  • Page 202 This Page Intentionally Left Blank Part Number 8001119 10/19...

  • Page 203: 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. • Refer to “Operational Analysis Chart” for the list of data that must be collected for refrigeration diagnostics.

  • Page 204: Qm20 Self-Contained Air-Cooled

    QM20 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Entering Harvest Water Temperature °F/°C...

  • Page 205: Qm30 Self-Contained Air-Cooled

    QM30 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C...

  • Page 206: Qm45 Self-Contained Air-Cooled

    QM45 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C...

  • Page 207: Qm45 Operating Temperatures

    QM45 OPERATING TEMPERATURES NOTE: Suction temp drops gradually throughout the freeze cycle. 50°F (10°C) Water Freeze Cycle Harvest Cycle Air Temp. Entering Discharge Suction Discharge Suction Condenser Temp Temp Temp Temp °F (°C) °F (°C) °F (°C) °F (°C) 50°F 150-165 67-50 155-190...

  • Page 208: Sm50 Self-Contained Air-Cooled

    SM50 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21 15.6-17.8 15.3-17.4 15.6-17.8 80/27...

  • Page 209: Q130 Self-Contained Air-Cooled

    Q130 SELF-CONTAINED AIR-COOLED (Before Serial Number 310047287) NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21...

  • Page 210: Q130 Self-Contained Air-Cooled

    Q130 SELF-CONTAINED AIR-COOLED (After Serial Number 310047287) NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21...

  • Page 211: Q130 Self-Contained Water-Cooled

    Q130 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Around Ice Harvest Water Temperature °F/°C Machine Time °F/°C 50/10 70/21 90/32 70/21 10.2-12.4 12.3-14.8 14.3-17.2...

  • Page 212: Q170 Self-Contained Air-Cooled

    Q170 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: Data is preliminary. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21...

  • Page 213: Q210 Self-Contained Air-Cooled

    Q210 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21 14.8-16.9 17.5-19.9 19.8-22.5 80/27...

  • Page 214: Q210 Self-Contained Water-Cooled

    Q210 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Freeze Time Air Temp. Harvest Around Ice Water Temperature °F/°C Time Machine °F/°C 50/10 70/21 90/32 70/21 14.5-16.5 15.6-17.8 19.2-21.8 80/27...

  • Page 215: Q270 Self-Contained Air-Cooled

    Q270 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 70/21 11.0-12.6 12.8-14.7 14.5-16.5 80/27...

  • Page 216: Q270 Self-Contained Water-Cooled

    Q270 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Around Ice Harvest Water Temperature °F/°C Machine Time °F/°C 50/10 70/21 90/32 70/21 10.6-12.2 12.3-14.0 13.5-15.4...

  • Page 217: 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 218: Qm20

    QM20 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L2 (N) COMPRESSOR OVERLOAD (24) PROTECTOR THERMISTOR STARTING DEVICE ICE THICKNESS (23) ADJUSTMENT FAN MOTOR CONTROL DIAL (AIR COOLED ONLY) BOARD LIGHT (22)

  • Page 219: Qm30

    QM30 115V/1 Ph/60 Hz CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. (27) (26) COMPRESSOR COMPRESSOR OVERLOAD (24) RELAY CONTACTS PROTECTOR THERMISTOR STARTING DEVICE (25) CONTROL FAN MOTOR BOARD COMPRESSOR (AIR COOLED ONLY) RELAY COIL OVERFLOW 1 (23)

  • Page 220: Qm30

    QM30 230V/1 Ph/50 Hz CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L2 (N) COMPRESSOR OVERLOAD (24) PROTECTOR THERMISTOR STARTING DEVICE ICE THICKNESS (23) ADJUSTMENT FAN MOTOR CONTROL DIAL (AIR COOLED ONLY) BOARD...

  • Page 221: Qm45

    QM45 CAUTION: DISCONNECT POWER BEFORE L2 (N) WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. (22) (24) THICKNESS PROBE BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (10) (21) SWITCH LIGHT (11) HARVEST LIGHT...

  • Page 222: Sm50

    SM50 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. START CAPACITOR COMPRESSOR (23) (32) (33) START RELAY CONTROL BOARD (24) (20) TRANS. DRAIN FUSE (7A) PUMP (25) HOT GAS SOLENOID (26) (47) (29) (48) FAN MOTOR (42)

  • Page 223: Q130/Q210

    Q130/Q210 Tecumseh Compressor L2 (N) NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) ICE THICKNESS (24) PROBE BIN SWITCH (23) WASH TOGGLE SWITCH (20) CONTROL BOARD (21) (10) SWITCH (11) LIGHT HARVEST LIGHT CONTACTOR COIL HOT GAS SOLENOID FUSE...

  • Page 224: Q130/Q170/Q210

    Q130/Q170/Q210 Danfoss Compressor NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) (22) ICE THICKNESS (24) PROBE BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (21) (10) SWITCH (11) LIGHT HARVEST LIGHT RELAY COIL HOT GAS SOLENOID FUSE...

  • Page 225: Q270

    Q270 Tecumseh Compressor CAUTION: DISCONNECT POWER BEFORE L2 (N) WORKING ON ELECTRICAL CIRCUITRY. DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) THICKNESS (24) PROBE BIN SWITCH (23) WASH TOGGLE SWITCH CONTROL (20) BOARD (21) (10) SWITCH LIGHT CONTACTOR COIL (16)

  • Page 226: Q270

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

  • Page 227: Electronic Control Boards

    Electronic Control Boards QM20/QM30 ICE BRIDGE LIQUID LINE THICKNESS THERMISTOR CONTROL CONNECTION POWER LIGHT 8 AMP FUSE Part Number 8001119 10/19...
  • Page 228 QM45/Q130/Q170/Q210/Q270 DC LOW VOLTAGE ICE THICKNESS ELECTRICAL PLUG PROBE BIN SWITCH LIGHT HARVEST LIGHT AC LINE VOLTAGE ELECTRICAL PLUG 10 AMP FUSE Part Number 8001119 10/19...
  • Page 229 SM50 FUSE (7A) TRANSFORMER THERMISTOR BIN LIGHT CONNECTION DISPLAY BOARD CONNECTION BIN THERMOSTAT BIN LIGHT CONNECTION SWITCH Part Number 8001119 10/19...

  • Page 230: Tubing Schematics

    Tubing Schematics QM20/QM30 Tubing Schematic EVAPORATOR HEAT EXCHANGER CAP TUBE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER DRIER SV3022 Part Number 8001119 10/19...
  • Page 231 QM45/Q130 Tubing Schematic EVAPORATOR HEAT EXPANSION EXCHANGER VALVE HOT GAS SOLENOID COMPRESSOR AIR OR WATER CONDENSER STRAINER DRIER RECEIVER (Q130 WATER COOLED ONLY) SV3024 Part Number 8001119 10/19...
  • Page 232 SM50 Tubing Schematic HEAT EVAPORATOR EXCHANGER CAP TUBE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER DRIER Part Number 8001119 10/19...
  • Page 233 Q170/Q210/Q270 Tubing Schematic EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE AIR OR COMPRESSOR WATER CONDENSER STRAINER DRIER COMPRESSOR RECEIVER (WATER COOLED ONLY) SV3023 Part Number 8001119 10/19...
  • Page 234 This Page Intentionally Left Blank Part Number 8001119 10/19...
  • Page 236 MANITOWOC ICE 2110 SOUTH 26TH STREET MANITOWOC, WI 54220 800-545-5720 WWW.MANITOWOCICE.COM © 2008 Manitowoc Part Number 8001119 10/19...

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