Compact CMS050A004 Owner's Manual
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Compact CMS050A004 Owner's Manual

Cm series ice machine
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CM050
CM Model
Ice Machines
This manual is updated as new
STH003
Information and models are released
06/06
Visit our website for the latest manual:
©Manitowoc Ice, Inc.
www.compact-ice.com

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Summary of Contents for Compact CMS050A004

  • Page 1 CM050 CM Model Ice Machines This manual is updated as new STH003 Information and models are released 06/06 Visit our website for the latest manual: ©Manitowoc Ice, Inc. www.compact-ice.com...
  • Page 2 Safety Notices When using or servicing these Ice Machines, 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 ice machine. Throughout this handbook, you will see the following types of safety notices: WARNING Text in a Warning box alerts you to a potential...
  • Page 3 Procedural Notices When using or servicing these Ice Machines, be sure to read the procedural notices in this handbook. These notices supply helpful information that may assist you as you work. Throughout this handbook, you will see the following types of procedural notices: IMPORTANT Text in an Important box provides you with information that may help you perform a procedure...
  • Page 4 Compact Ice Machine. Read and understand this manual. If you encounter problems not covered by this manual, do not proceed, contact Manitowoc Ice, Inc. We will be happy to provide assistance. IMPORTANT Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS GENERAL INFORMATION......7 MODEL NUMBERS ........7 ACCESSORIES...........8 MODEL/SERIAL NUMBER LOCATION ..9 OWNER WARRANTY REGISTRATION... 9 INSTALLATION .......... 13 LOCATION OF ICE MACHINE ....13 ICE MACHINE HEAT OF REJECTION ..14 LEVELING THE ICE MACHINE ....15 WATER SERVICE/DRAINS .......16 ELECTRICAL REQUIREMENTS....18 COMPONENT IDENTIFICATION ....19 OPERATIONAL CHECKS ......19...
  • Page 6 HOT GAS VALVE........52 BIN THERMOSTAT........55 ICE PRODUCTION CHECK ...... 57 ADJUSTING CUBE WEIGHT ....58 LIQUID LINE THERMISTOR ....59 TOTAL SYSTEM REFRIGERATION CHARGE..........61 COMPONENT SPECIFICATIONS AND CHECK PROCEDURES ..........62 MAIN FUSE ..........62 COMPRESSOR ELECTRICAL DIAGNOSTICS.........

  • Page 7: General Information

    GENERAL INFORMATION MODEL NUMBERS This manual covers the following models: CMS050A004 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.

  • Page 8: Accessories

    LEGS Four inch adjustable legs are available. DRAIN PUMP Pumps waste water from ice machine to drain. MANITOWOC ICE MACHINE CLEANER AND SANITIZER These are the only cleaner and sanitizer approved for use with Compact products. Cleaner Part Number...

  • Page 9: Model/Serial Number Location

    MODEL/SERIAL NUMBER LOCATION The model and serial numbers are required when requesting information from your local Compact retailer or Compact Ice at 800-235-9698. The model and serial number are listed on the MODEL/SERIAL NUMBER DECAL affixed to the ice machine MODEL/SERIAL NUMBER DECAL MODEL/SERIAL...

  • Page 10: Owner Warranty Registration

    1. Labor. For a period of ninety (90) days from the date of purchase by the consumer (“Purchaser”), if the Product is determined to be defective, Manitowoc Ice shall, at its option, replace the Product or pay the labor charges to any authorized Manitowoc Ice service facility to repair the Product.
  • Page 11 Product that has not been installed in accordance with the instruction manual or technical instructions provided by Manitowoc Ice; and (7) any Product that has not been maintained, cleaned or sanitized in accordance with the instruction manual or technical instructions provided by Manitowoc Ice.
  • Page 12 To secure prompt and continuing warranty service, the warranty registration card must be completed and sent to Manitowoc Ice within thirty (30) days from the date of purchase by the Purchaser. Complete the enclosed registration card and send it to Manitowoc Ice at the...

  • Page 13: 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 14: Ice Machine Heat Of Rejection

    ICE MACHINE HEAT OF REJECTION Heat of Rejection* Air Conditioning** Peak 1,145 2,300 * 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.

  • Page 15: Leveling The Ice Machine

    LEVELING THE ICE MACHINE After moving the ice machine into the installation location, it must be leveled for proper operation. Follow these steps to level the ice machine: Use a level to check the levelness of the ice machine from front to back and from side to side. If the ice machine is not level, adjust the leveling glides or legs on each corner of the base of the ice machine as necessary.

  • Page 16: Water Service/Drains

    WATER SERVICE/DRAINS WATER SUPPLY 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 17 WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS...

  • Page 18: 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). • A qualified electrician must determine proper wire size dependent upon location, materials used and length of run (minimum circuit ampacity can be used to help select the wire size).

  • Page 19: Component Identification

    COMPONENT IDENTIFICATION Bin Light Control Panel Water Shutters Water Trough Evaporator Compartment Thermostat Adjustment Grill Water Pu mp Electrical Drain Pu mp (Optio nal) Drain Refrig erat io n Water In let Comp ression...
  • Page 20 Water Pum p Evaporator Water Shutter Assembly Water Supply Line Note: Evap orator removed for clarity Spray Bar Spray Evaporator Nozzles Bucket Water Shutters Control Board...

  • Page 21: Operational Checks

    OPERATIONAL CHECKS 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.
  • Page 22 SAFETY TIMERS The control board has the following non- adjustable safety timers: • Initial cycle is 5 minutes longer than subsequent cycles. • The ice machine is locked into the freeze cycle for 10 minutes (15 minutes initial cycle) before a harvest cycle can be initiated.

  • Page 23: 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 24 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 25: Interior Cleaning And Sanitizing

    INTERIOR CLEANING AND SANITIZING CAUTION Use only Manitowoc approved Ice Machine Cleaner (part number 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 26 CAUTION Damage to the ice machine evaporator caused by incorrect chemical usage is not covered by the warranty. Use Manitowoc Ice Machine Cleaner (part number 000000084) and Sanitizer (part number 94-0565-3) only. IN PLACE CLEANING/SANITIZING PROCEDURE This procedure allows monthly in place cleaning of all surfaces that come in contact with the water system.
  • Page 27 This entire cycle lasts approximately 30 minutes. Step 6 Prepare 1/2 oz (1 tablespoon) of undiluted Manitowoc Ice Machine Sanitizer (part number 94- 0565-3 only) in a container that will fit into the same area.

  • Page 28: Cleaning Procedure

    CLEANING PROCEDURE Ice machine cleaner is used to remove lime scale and other mineral deposits. Ice machine sanitizer disinfects and removes algae and slime. NOTE: All ice must be removed from the bin. Step 1 Prepare 4 oz (1/2 cup) of undiluted Manitowoc Ice Machine Cleaner (part number 000000084 only) in a container that will fit easily under the lifted water shutters.
  • Page 29 Step 7 Take all removed components to a sink for cleaning. Use 1/2 of the cleaner/water mixture to clean all components. The cleaner solution will foam when it contacts lime scale and mineral deposits; once the foaming stops, use a soft-bristle nylon brush, sponge or cloth (NOT a wire brush) to carefully clean the parts.
  • Page 30 Step 15 Wait 3 minutes until the Clean light flashes, then add the prepared Manitowoc Sanitizer by lifting the water shutters and pouring directly into the spray area. The ice machine will automatically time out a ten minute sanitizing cycle, followed by eight rinse cycles, and stop.

  • Page 31: Removal Of Parts For Cleaning And Sanitizing

    REMOVAL OF PARTS FOR CLEANING AND SANITIZING TOP COVER Remove two back screws. Slide back and lift cover off. WARNING Disconnect electric power to the ice machine at the electric switch box before proceeding.
  • Page 32 WATER SHUTTERS The water shutter is designed to keep the spraying water from escaping the evaporator compartment. To remove just the water shutters: Grasp one end of the water shutter and lift up. Pivot water shutter and disengage remaining end. 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.
  • Page 33 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 34 SUMP DRAIN OVERFLOW TUBE Remove clamp. Pull down to remove overflow tube and tubing as an assembly. The sump trough water will drain into the bin. Remove overflow tube from vinyl tubing by pulling. Remove Clamp & Pull Down...
  • Page 35 WATER TROUGH Depress tabs on right and left side of the water trough. Allow front of water trough to drop as you pull forward to disengage the rear pins.
  • Page 36 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. Grasp pump and pull straight down until water pump disengages and electrical connector is visible.
  • Page 37 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. Grasp one end of the spray bar, lift up and remove from seat formed in evaporator bucket.
  • Page 38 REMOVAL FROM SERVICE/LONG TERM STORAGE/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 39: Ice Making Sequence Of Operation

    ICE MAKING SEQUENCE OF OPERATION Depending on ambient conditions and cold water supply temperature, the ice making process will take approximately 30 minutes. Initial Start-Up or Start-Up After Automatic Shut-Off — Water Fill Before the compressor starts, the water inlet valve will energize to purge old water from the system for about 3 minutes.
  • Page 40 ENERGIZED PARTS CHART SELF-CONTAINED ICE MACHINES...

  • Page 41: Troubleshooting

    TROUBLESHOOTING 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 42 Verify the “Power” switch functions properly. • If the red control board light is energized and depressing the “Power” switch does not energize the green “Power” light, check the interconnecting wire, then replace the interface board. Verify the bin thermostat functions properly. •...

  • Page 43: Ice Machine Will Not Harvest

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

  • Page 44: Ice Quality Is Poor - Cubes Are Shallow, Incomplete Or White

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

  • Page 45: Freeze Cycle Is Long, Low Ice Production

    FREEZE CYCLE IS LONG, LOW ICE PRODUCTION Problem • Cause 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 46: Ice Machine Runs & No Ice Is Produced

    ICE MACHINE RUNS & NO ICE IS PRODUCED Problem • Cause 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 •...

  • Page 47: Analyzing Discharge Pressure

    ANALYZING DISCHARGE PRESSURE Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough______ Refer to Cycle Times/24 Hour Ice Production/Refrigeration Pressure Chart for ice machine being checked. Use the operating conditions determined in Step 1 to find the published normal discharge pressures.
  • Page 48 DISCHARGE PRESSURE HIGH CHECKLIST Problem • Cause Improper Installation • Refer to “Installation/Visual Inspection Checklist” Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan motor Improper Refrigerant Charge •...

  • Page 49: 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 50 PROCEDURE Step 1. Determine the ice Air temp. entering condenser: machine operating 90°F/32.2°C conditions. 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” 19.1 - 21.7 minutes charts for ice machine Published freeze cycle time: model being checked.
  • Page 51 SUCTION PRESSURE HIGH CHECKLIST Problem • Cause Improper Installation • Refer to “Installation/Visual Inspection Checklist” Discharge Pressure • Discharge pressure is too high, and is affecting suction pressure, refer to “Freeze Cycle Discharge Pressure High Checklist” Improper Refrigerant Charge • Overcharged •...

  • Page 52: 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: Prevents refrigerant from entering the evaporator during the freeze cycle.
  • Page 53 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 54 EXAMPLES OF HOT GAS VALVE INLET/COMPRESSOR DISCHARGE LINE TEMPERATURE COMPARISON Findings Comments The inlet of the This is normal as the discharge hot gas valve is line should always be too hot to cool enough to touch and the hot gas valve touch and the inlet, although too hot to touch compressor...

  • Page 55: Bin Thermostat

    BIN THERMOSTAT 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 56 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 57: Ice Production Check

    ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21.2°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 58: Adjusting Cube Weight

    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. The light will flash once for each additional minute of freeze cycle time.

  • Page 59: Liquid Line Thermistor

    LIQUID LINE THERMISTOR Function The liquid line thermistor senses the refrigeration system liquid line temperature. This is used in conjunction with the control board to determine the length of the freeze and harvest cycles. Specifications 10,000 Ohms ± 2% at 25°C (77°F) CAUTION Use only Manitowoc thermistors.
  • Page 60 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. SM50 Resistance Chart Temperature of Thermistor Resistance °C °F K Ohms (x 1000) 15.6°...

  • Page 61: Total System Refrigeration Charge

    TOTAL SYSTEM REFRIGERATION 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. Model Refrigerant Refrigerant Charge (grams) Type CM50 R-134A Air Cooled...

  • Page 62: Component Specifications And Check Procedures

    COMPONENT SPECIFICATIONS AND CHECK PROCEDURES MAIN FUSE Function The control board fuse stops ice machine operation if electrical components fail causing high amp draw. Specifications Volt CM50 Check Procedure WARNING High (line) voltage is applied to the control board at all times. Removing the control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.

  • Page 63: 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 assure that the overload is closed and the resistance readings will be accurate.
  • Page 64 COMPRESSOR DRAWING LOCKED ROTOR The two likely causes of this are: • Defective starting component • Mechanically seized compressor To determine which you have: • Install high and low side gauges. • Try to start the compressor. • Watch the pressures closely. If the pressures do not move, the compressor is seized.

  • Page 65: 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 66: Cycle Times, 24 Hr Ice Production And Refrigerant Pressure 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 67: Operating Pressures

    NOTE: THESE CHARACTERISTICS MAY VARY DEPENDING ON OPERATING CONDITIONS. Cycle Times Freeze Time + Harvest Time = Cycle Time AIR TEMP. FREEZE TIME HARVEST ENTERING TIME WATER TEMPERATURE °F/°C CONDENSER °F/°C 50/10.0 70/21.1 90/32.2 70/21.1 15.6-17.8 15.3-17.4 15.6-17.8 80/26.7 16.6-18.9 17.0-19.4 17.4-19.8 1.0-3.5...

  • Page 68: Refrigerant Definitions

    REFRIGERANT 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 69: Refrigerant Re-Use Policy

    IMPORTANT Manitowoc Ice, Inc. assumes no responsibility for use of contaminated refrigerant. Damage resulting from the use of contaminated, recovered, or recycled refrigerant is the sole responsibility of the servicing company.
  • Page 70 Recovered refrigerant must come from a “contaminant-free” system. To decide whether the system is contaminant free, consider: • Type(s) of previous failure(s) • Whether the system was cleaned, evacuated and recharged properly following failure(s) • Whether the system has been contaminated by this failure •...
  • Page 71 Follow the manufacturer’s recommendations. Install and uninstall your manifold gauge set correctly to prevent refrigerant loss. IMPORTANT Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 72 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. Recovery/Evacuation Place the toggle switch in the OFF position. Install manifold gauges, charging scale, and recovery unit or two-stage vacuum pump.
  • Page 73 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 Be sure the toggle switch is in the OFF position.
  • Page 74 Make sure that all refrigerant in the charging hose is drawn into the ice machine before disconnecting the manifold gauge set. Drain the water from the sump trough. Run the ice machine in the freeze cycle for 5 minutes. C. Remove the high side hose with the quick disconnect.

  • Page 75: System Contamination Cleanup

    This section describes the basic requirements for restoring contaminated systems to reliable service. IMPORTANT Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 76 Contamination/Cleanup Chart Symptoms/Findings Required Cleanup Procedure No symptoms or suspicion Normal of contamination evacuation/recharging procedure Moisture/Air Contamination Mild contamination symptoms Refrigeration cleanup procedure system open to atmosphere for longer than 15 minutes Refrigeration test kit and/or acid oil test shows contamination No burnout deposits in open compressor lines...
  • Page 77 MILD SYSTEM CONTAMINATION CLEANUP Procedure Replace any failed components. If the compressor is good, change the oil. 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 78: Severe System Contamination Cleanup Procedure

    SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE Remove the refrigerant charge. Remove the compressor. Wipe away any burnout deposits from suction and discharge lines at compressor. Sweep through the open system with dry nitrogen. IMPORTANT Refrigerant sweeps are not recommended, as they release CFC’s into the atmosphere.
  • Page 79 Charge the system with the proper refrigerant to the nameplate charge. 10. Operate the ice machine for one hour. Then, check the pressure drop across the suction line filter-drier. If the pressure drop is less than 2 psig, the filter-drier should be adequate for complete cleanup.

  • Page 80: 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 81 FIG. A - “PINCHING OFF” TUBING FIG. B - RE-ROUNDING TUBING SV1406 Using Pinch Off Tool...

  • Page 82: Brazing Procedures For Danfoss Solenoid 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 83 MAX. 1300°F (700°C) SV3071 Apply heat to copper tubing first and move flame toward valve socket. Heat copper tubing for approximately 10 to 15 seconds then direct the heat to the solenoid socket Heat the solenoid socket for 2 to 5 seconds and apply silver solder to joint.

  • Page 84: Filter-Driers

    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 85: Control Board

    CONTROL BOARD FUSE (7A) TRANSFORMER THERMISTOR BIN LIGHT CONNECTION DISPLAY BOARD CONNECTION THERMISTAT CONNECTION BIN LIGHT SWITCH...

  • Page 86: Wiring Diagrams

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

  • Page 87: Tubing Schematic

    TUBING SCHEMATIC HEAT EXCHANGER EVAPORATOR CAP TUBE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER DRIER...
  • Page 88 Compact Ice by Manitowoc Manitowoc WI 54221-1720 Phone: 1-800-235-9698 Website – www.compact-ice.com ©2006 Manitowoc Ice, Inc.

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