Manitowoc QuietQube ST3000W Technician's Handbook
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Manitowoc QuietQube ST3000W Technician's Handbook

Manitowoc QuietQube ST3000W Technician's Handbook

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ST3000W Water-cooled and
SF3000C QuietQube® Models
Technician's Handbook
Part Number: STH114_00 01/24

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Summary of Contents for Manitowoc QuietQube ST3000W

  • Page 1 ST3000W Water-cooled and SF3000C QuietQube® Models Technician’s Handbook Part Number: STH114_00 01/24...

  • Page 3: Safety Notices

    Safety Notices Read these precautions to prevent personal injury: • Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death. • Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.

  • Page 4: Definitions

    DEFINITIONS DANGER Indicates a hazardous situation that, if not avoided, will result in death or serious injury. This applies to the most extreme situations. Warning Indicates a hazardous situation that, if not avoided, could result in death or serious injury. Caution Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
  • Page 5 Warning Follow these electrical requirements during installation of this equipment: • All field wiring must conform to all applicable codes of the authority having jurisdiction. It is the responsibility of the end user to provide the disconnect means to satisfy local codes. Refer to rating plate for proper voltage.
  • Page 6 Warning Follow these precautions to prevent personal injury during installation of this equipment: • Installation must comply with all applicable equipment fire and health codes with the authority having jurisdiction. • Connect to a potable water supply only. • To avoid instability the installation area must be capable of supporting the combined weight of the equipment and product.
  • Page 7 DANGER Follow these flammable refrigeration system requirements during installation, use or repair of this equipment: • Refer to nameplate - Ice machine models may contain up to 150 grams of R290 (propane) refrigerant. R290 (propane) is flammable in concentrations of air between approximately 2.1% and 9.5% by volume (LEL lower explosion limit and UEL upper explosion limit).
  • Page 8 DANGER (continued) Follow these flammable refrigeration system requirements during installation, use or repair of this equipment: • All lockout and tag out procedures must be followed when working on this equipment. • This equipment contains high voltage electricity and refrigerant charge. Shorting electrical wires to refrigeration tubing may result in an explosion.
  • Page 9 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment: • Legs or casters must be installed and the legs/casters must be screwed in completely. When casters are installed the mass of this unit will allow it to move uncontrolled on an inclined surface.
  • Page 10 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment: • Objects placed or dropped in the bin can affect human health and safety. Locate and remove any objects immediately. • Never use sharp objects or tools to remove ice or frost.
  • Page 11 DANGER Follow these precautions to prevent personal injury during use and maintenance of this equipment: • It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures. • Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other Appliance.
  • Page 12 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Refer to nameplate to identify the type of refrigerant in your equipment. • Only trained and qualified personnel aware of the dangers are allowed to work on the equipment. •...
  • Page 13 Warning Follow these precautions to prevent personal injury during use and maintenance of this equipment: • Units with two power cords must be plugged into individual branch circuits. During movement, cleaning or repair it is necessary to unplug both power cords. •...
  • Page 14 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 15: Table Of Contents

    Table of Contents Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Definitions .
  • Page 16 Maintenance De-scaling and Sanitizing . . . . . . . . . . . . . . . . . . . . .47 General .
  • Page 17 Symptom #2 Low Production, Long Freeze Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88 Symptom #2 - Freeze Cycle Refrigeration System Operational Analysis Table Procedures .
  • Page 18 Diagnosing Ice Thickness Control Circuitry . . . . .133 Problem: Ice Machine Does Not Cycle into Harvest When Water Contacts the Ice Thickness Control Probe . . . . . . . . . . . . . .133 Problem: Ice Machine Cycles into Harvest Before Water Contact with the Ice Thickness Probe .
  • Page 19 Refrigerant Recovery/Evacuation . . . . . . . . . . . . .153 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . .153 Refrigerant re-use Policy .
  • Page 20 Charts Cycle Times/24-Hour Ice Production/ Refrigerant Pressure Charts . . . . . . . . . . . . . . . . . .181 For SF3000C/CVDF3000 models only .

  • Page 21: General Information

    CVD® Condensing Unit SDF3000C-161 CVDF3000-263 SYF3000C-161 Warning All Manitowoc ice machines require the ice storage system (bin, dispenser, etc.) to incorporate an ice deflector. Prior to using a non-Manitowoc ice storage system with other Manitowoc ice machines, contact the manufacturer to ensure their ice deflector is compatible with Manitowoc ice machines.

  • Page 22: How To Read A Model Number

    How to Read a Model Number HEAD SECTIONS Part Number: STH114_00 01/24...

  • Page 23: Warranty

    Warranty For warranty information visit: www.manitowocice.com/Service/Warranty • Warranty Coverage Information • Warranty Registration • Warranty Verification Warranty coverage begins the day the ice machine is installed. WARRANTY REGISTRATION Completing the warranty registration process is a quick and easy way to protect your investment. Scan the QR code with your smart device or enter the link in a web browser to complete your warranty registration.
  • Page 24 THIS PAGE INTENTIONALLY LEFT BLANK Part Number: STH114_00 01/24...

  • Page 25: Installation

    Installation Location of Ice Machine HEAD SECTION The location selected for the ice machine head section must meet the following criteria. If any of these criteria are not met, select another location. • The location must be indoors, and free of airborne and other contaminants.

  • Page 26: Installation Requirements

    INSTALLATION REQUIREMENTS Head Sections • Vent the ice machine and bin drains separately. • The ice machine and bin must be de‑scaled and sanitized after installation. • The drain line must contain a union or other suitable means of disconnection at the ice machine. QuietQube®...

  • Page 27: Bins

    Optional kits are available to adapt ice machines on large capacity bins. • S3000 ice machines are not approved for use on Manitowoc B970 or D970 bins. • Casters are not approved for use on large capacity bins. Minimum/Maximum Temperatures...

  • Page 28: Clearance Requirements

    Clearance Requirements Caution The ice machine must be protected if it will be subjected to temperatures below 32°F (0°C). Failure caused by exposure to freezing temperatures is not covered by the warranty. Head Sections Model Top/Sides Sides ST3000W 8" 24" SF3000C (20 cm) (61 cm)

  • Page 29: Bin Installation

    Use a level on top of the bin. Turn the base of each foot as necessary to level the bin. 6. Inspect bin gasket prior to ice machine installation. Manitowoc bins come with a closed cell foam gasket installed along the top surface of the bin. Warning Remove all panels from ice machine before lifting and installing on bin.

  • Page 30: Electrical Requirements

    Electrical Requirements All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes. The following precautions must be observed: • The ice machine must be grounded. • A separate fuse/circuit breaker (dedicated circuit) must be provided for each ice machine head section, or condensing unit.

  • Page 31: Minimum Circuit Ampacity

    MINIMUM CIRCUIT AMPACITY • The minimum circuit ampacity is used to help select the wire size of the electrical supply. (Minimum circuit ampacity is not the ice machine’s running amp load.) • The wire size (or gauge) also depends on location, materials used, length of run, etc., so it must be determined by a qualified electrician.

  • Page 32: Maximum And Minimum Circuit

    Maximum Minimum Voltage/ Minimum Fuse/ Wire Size Unit Phase/ Circuit Circuit Required by Cycle Amps Breaker Manitowoc ST3000W 208‑ Head 30 amp 30.0 230/3/60 Section SF3000C #14 Solid QuietQube 115/1/60 15 amp Copper Head...

  • Page 33: Water Supply And Drains

    Water Supply and Drains WATER SUPPLY AND DRAIN LINE SIZING/ CONNECTIONS Tubing Size Water Water up to Ice Location Machine Temperature Pressure Machine Fitting Fitting 35°F (4.4°C) 20 psi Min. 0.375" 0.375" Ice Making Min. (1.37 bar) (10 mm) (10 mm) Water Inlet 90°F (32°C) 80 psi Max.
  • Page 34 (1.37 bar to 24.1 bar). • SF3000C ‑ If water pressure exceeds the maximum recommended pressure of 80 psig (1.5 bar), obtain a water pressure regulator from your Manitowoc distributor. • Install a water shut‑off valve and union for potable water and water cooled condenser lines.
  • Page 35 Water-Cooled Condenser Water Pressure ST3000W ‑ Water pressure at the condenser cannot exceed 350 psi (24.1 bar). Cooling Tower Applications (Water-Cooled Models) 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.
  • Page 36 Drain Connections • Drain lines must have a 1.5" drop per 5 feet of run, and must not create traps. • The floor drain must be large enough to accommodate drainage from all drains. • Run separate bin and ice machine drain lines. Insulate them to prevent condensation.
  • Page 37 Water Supply & Drain Connections Item Description Electrical Entrance (2) Options Vent Tube ‑ Minimum Height 18" (46 cm) Ice Making Water Inlet 0.375" (10 mm) Ice Making Water Drain 1.0" (25 mm) Water Condenser Drain 0.75"(19 mm) Install Separate Drain When Used Condenser Water Inlet 0.75"...

  • Page 38: Condensing Unit Installation

    Liquid Line *All line sets must be insulated with Armaflex Notice Manitowoc systems are only approved and warranted as a complete new package. Warranty on the refrigeration system will be void if a new ice machine head section is connected to preexisting (used) tubing or condensing units or vice versa.
  • Page 39 Caution The refrigeration system warranty will not apply if the Manitowoc Ice Machine and Manitowoc CVD Condensing Unit are not installed according to specifications. This warranty also will not apply if the refrigeration system is modified with a condenser, heat reclaim device, or other parts or assemblies not manufactured by Manitowoc.
  • Page 40 A suction line oil trap is required when rise is more than 20 feet (6 meters). • Only one trap is allowed in the line set. • Shorten the line set as required, do not coil line set. Manitowoc S-Trap Kit S-Trap Tubing Model Kit Number Size 0.75"...
  • Page 41 SF3000C has 2 suction lines and requires installation of a tee at the condensing unit. Item Description Suction Line on Condensing Unit Suction Line from Head Section Suction Line from Head Section VALVES MUST REMAIN CLOSED AND BE PROTECTED FROM HEAT WHEN BRAZING (WRAP WITH WET RAG) Part Number: STH114_00 01/24...
  • Page 42 Step 3 Pressure Test and Evacuate Line Set and CVD Condensing Unit • Shutoff valves for the line set must remain closed until pressure testing and evacuation are complete. • Valve core removal tools that allow for removal and installation of the valve cores without removing hoses for the manifold gauge set are recommended to decrease the evacuation time.
  • Page 43 Step 4 Open Valves for the Line Set and Receiver You will not hear refrigerant flow when the valves are opened. Refrigerant will not flow until the ice machine is started and the solenoid valve opens. • All valve caps must be reinstalled, tightened and leak‑ checked to ensure no refrigerant leakage exists.
  • Page 44 Step 5 Leak-Check the Refrigeration System Connect power to the ice machine head section ‑ Do not connect power to the CVD condensing unit. Place the ICE/OFF/CLEAN toggle switch in the ICE position for 60 seconds to equalize pressures. Disconnect power to the ice machine head section.

  • Page 45: Ice Machine Refrigerant Amounts

    Ice Machine Refrigerant Amounts Ice Machine Head Section Each ice machine head section ships from the factory with a R‑404A or R‑410A refrigerant charge appropriate for the entire system operation. The serial tag on the ice machine indicates the refrigerant charge. The refrigerant charge is sufficient to operate the ice machine at all ambients with line set lengths up to 100 feet (30 m).
  • Page 46 THIS PAGE INTENTIONALLY LEFT BLANK Part Number: STH114_00 01/24...

  • Page 47: Maintenance

    An extremely dirty ice machine must be taken apart for De-scaling and sanitizing. Manitowoc Ice Machine De-scaler and Sanitizer are the only products approved for use in Manitowoc ice machines. Using non-Manitowoc de-scalers, sanitizers, cleaners or solutions may result in bodily harm and/or cause damage to the ice machine that is not covered under the warranty.

  • Page 48: Exterior Cleaning

    EXTERIOR CLEANING Clean the area around the ice machine as often as necessary to maintain cleanliness and efficient operation. Wipe surfaces with a damp cloth rinsed in water to remove dust and dirt from the outside of the ice machine. If a greasy residue persists, use a damp cloth rinsed in a mild dish soap and water solution.
  • Page 49 Caution Use only Manitowoc approved Ice Machine De-scaler and Sanitizer for this application (Manitowoc De-scaler part number 9405463 and Manitowoc Sanitizer part number 9405653). It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling.

  • Page 50: Detailed De-Scaling Procedure

    DETAILED DE-SCALING PROCEDURE Step 1 Set the toggle switch to the OFF position after ice falls from the evaporator at the end of a Harvest cycle. Or, set the switch to the OFF position and allow the ice to melt off the evaporator. Step 2 Remove top cover.
  • Page 51 Step 6 Mix a solution of de-scaler and warm water. Depending upon 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.

  • Page 52: Detailed Sanitizing Procedure

    Step 7 Wait until the water trough refills and water flows over each evaporator (approximately 3 minutes). Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough by pouring between the water curtain and evaporator. Amount of Sanitizer...

  • Page 53: Parts Removal For Detailed De-Scaling

    Step 8 Move the toggle switch to the ICE position and replace the front panel. The ice machine will automatically start ice making after the sanitize cycle is complete (approximately 80 minutes) Parts Removal for Detailed De‑scaling & Sanitizing Notice Electrical connector must never be exposed to any liquids.
  • Page 54 D. Remove ice thickness probes • Compress the hinge pin on the top of each ice thickness probe. • Pivot the ice thickness probe to disengage one pin then the other. The ice thickness probe can be cleaned at this point without complete removal. If complete removal is desired, disconnect the ice thickness control wiring from the control board.
  • Page 55 H. Remove ice dampers NOTE: Each evaporator has an ice damper that must be removed - total of four ice dampers. • Grasp ice damper and apply pressure toward the back mounting bracket. • Apply pressure to the front mounting bracket with thumb.

  • Page 56: Remedial De-Scaling & Sanitizing Procedure

    Remedial De‑scaling & Sanitizing Procedure This procedure de-scales/sanitizes all components in the water flow path, and is used to de-scale/sanitize the ice machine between the bi-yearly detailed de-scaling and sanitizing procedure. Ice machine de-scaler is used to remove lime scale and mineral deposits.

  • Page 57: Exterior Cleaning

    Step 3 Remove all ice from the bin. Step 4 Place the toggle switch in the CLEAN position. The water will flow through the water dump valve and down the drain. Wait until the water trough refills and water flows over the evaporator, then add the proper amount of ice machine de-scaler or sanitizer.

  • Page 58: Removal From Service/Winterization

    Removal from Service/Winterization All Models 1. De-scale and sanitize the ice machine. 2. Move the ICE/OFF/CLEAN switch to OFF. 3. Turn off the water supply, disconnect and drain the incoming ice-making water line at the rear of the ice machine and drain the water trough. 4.

  • Page 59: Operation

    Operation Ice Making Sequence of Operation NOTE: The toggle switch must be in the ice position and the water curtain/ice dampers must be in place on the evaporator before the ice machine will start. INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 1.
  • Page 60 2. Refrigeration System Start-Up Ice Machine Head Section The liquid line solenoid valve and water inlet valve energize. Five seconds later evaporator models de-energize the harvest valve(s) and air compressor (when used). CVD Condensing Unit When the refrigerant pressure is high enough to close the low-pressure control the contactor coil energizes and the compressor starts.

  • Page 61: Freeze Sequence

    FREEZE SEQUENCE 3. Pre chill The compressor lowers the temperature of the evaporator(s) before the water pump(s) are energized. The water fill valve will remain energized until water contacts the water level probe. ENERGIZED CONTROL BOARD LIGHTS Quad Evaporators = All Curtain Switches (green), Water Solenoid (red), Liquid Solenoid (red) 4.

  • Page 62: Harvest Sequence

    HARVEST SEQUENCE 5. Water Purge The air compressor (when used) and the harvest valve(s) open at the beginning of the water purge to divert hot refrigerant gas into the evaporator. The water pump continues to run, and the water dump valve energizes to purge the water in the water trough.
  • Page 63 6. Harvest The air compressor (when used) remains energized and the harvest valve(s) remains open. The refrigerant gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage bin. ENERGIZED CONTROL BOARD LIGHTS Quad Evaporators = All Curtain Switches (green), Liquid Solenoid (red), Harvest (red), All Harvest Valves (red) Quad Evaporator Models...

  • Page 64: Automatic Shut-Off

    Quad Evaporator Models Only Water Assist Harvest Feature Typical duration of a Harvest sequence is less than 2.5 minutes. When the Harvest sequence time reaches 4 minutes, the following occurs: • 4 minutes into a Harvest sequence: The water fill valve will energize to fill the trough with water until reaching the water level probe.
  • Page 65 CVD Condensing Unit The liquid line solenoid valve closes, allowing the refrigeration system to pump down. When the refrigerant pressure is low enough to open the fan cycling pressure control the condenser fan motor stops. When the refrigerant pressure is low enough to open the low pressure control, the contactor coil is de-energized and the compressor stops.
  • Page 66 Part Number: STH114_00 01/24...
  • Page 67 Part Number: STH114_00 01/24...
  • Page 68 Safety Timers The control board has the following non-adjustable safety timers: • The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can be initiated. • The maximum freeze time is 60 minutes at which time the control board automatically initiates a harvest sequence (steps 5 &...

  • Page 69: Control Board Timers

    Control Board Timers The control board has the following non-adjustable timers: • The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can be initiated. Freeze lock is bypassed after moving the toggle switch from OFF to ICE position for the first cycle only. •...

  • Page 70: Safety Limits

    Safety Limits Safety Limits are stored and indicated by the control board after three cycles. The number of cycles required to stop the ice machine varies for each Safety Limit. • Safety Limit 1 - If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle.

  • Page 71: Minimum/Maximum Slab Weight

    Minimum/Maximum Slab Weight Adjust ice thickness to meet chart specifications. Minimum Ice Maximum Ice Evaporator Weight Per Cycle Weight Per Cycle 24.4 lbs 27.5 lbs Quad Evaporators (11.07 kg) (12.5 kg) NOTE: S3000 series has four evaporators. Notice Routine adjustments and maintenance procedures are not covered by the warranty.

  • Page 72: Ice Thickness Check

    Ice Thickness Check After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (3 mm). NOTE: Make sure the water curtain is in place when performing this check.

  • Page 73: Troubleshooting

    Troubleshooting Safety Limits In addition to standard safety controls, the control board has built in safety limit controls which protect the ice machine from major component failures. Use the following procedures to determine if the control board contains a safety limit indication. 1.
  • Page 74 QUAD EVAPORATOR MACHINES ONLY When a safety limit condition causes the ice machine to stop, the harvest light on the control board continually flashes on and off. Use the following procedures to determine which safety limit has stopped the ice machine. 1.

  • Page 75: Safety Limit Analysis

    Eliminate all electrical components and external causes first. If it appears that the refrigeration system is causing the problem, use Manitowoc’s Freeze Cycle Refrigeration System Operational Analysis Table, along with detailed charts, checklists, and other references to determine the cause.

  • Page 76: Safety Limit #1

    Contactor not energizing • Compressor electrically non-operational • Defective fan cycling control • Defective fan motor Miscellaneous • Non-Manitowoc components • Improper refrigerant charge • Defective head pressure control • Defective harvest valve • Defective compressor Part Number: STH114_00 01/24...

  • Page 77: Safety Limit #2

    • TXV starving or flooding (check bulb mounting) • Non-condensible in refrigeration system • Plugged or restricted high side refrigerant lines or component • Restricted air flow/dirty condenser fins • High inlet air temperature • Condenser discharge air recirculation SAFETY LIMIT #2 Quad Models - Harvest time exceeds 7 minutes for 500 consecutive harvest cycles Possible Cause Checklist...

  • Page 78: Safety Limit #3

    Ice thickness probe out of adjustment • Ice thickness probe dirty • Bin switch closed/defective • Premature harvest Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective head pressure control valve • Defective harvest valve • TXV flooding (check bulb mounting) •...

  • Page 79: Control Board Testing

    Control Board Testing All replacement S Model control boards and ice machines with serial numbers larger than 110924847 have a control board that includes a diagnostic test cycle. The control board can be identified by the blue printed circuit board and a push button switch on the bottom left corner labeled “service mode”.

  • Page 80: Troubleshooting By Symptom

    Troubleshooting By Symptom The troubleshooting procedures follow flow charts. There are four symptoms, the symptom that you are experiencing will determine which flow chart to use. The flow chart asks yes and no questions to determine the problem. The flow chart will direct you to a procedure to correct the problem.

  • Page 81: Symptom #1 Ice Machine Will Not Run

    Part Number: STH114_00 01/24...
  • Page 82 Part Number: STH114_00 01/24...

  • Page 83: Section That Will Not Run

    DIAGNOSING AN ICE MACHINE HEAD SECTION THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #55 and #56) 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 84: Will Not Run

    DIAGNOSING A CONDENSING UNIT THAT WILL NOT If the ice machine water pump is not energized, refer to “Diagnosing an Ice Machine Head Section that Will Not Run” on page 83 1. Verify primary voltage is supplied to ice machine condensing unit and the fuse/circuit breaker is closed. 2.

  • Page 85: 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 86: Compressor Drawing Locked Rotor

    CHECK MOTOR WINDINGS TO GROUND Check continuity between all three terminals and the compressor shell or copper refrigeration line. Scrape metal surface to get good contact. If continuity is present, the compressor windings are grounded and the compressor should be replaced. COMPRESSOR DRAWING LOCKED ROTOR To determine if the compressor is seized, check the amp draw while the compressor is trying to start.

  • Page 87: Diagnosing Capacitors

    DIAGNOSING CAPACITORS • If the compressor attempts to start, or hums and trips the overload protector, check the starting components before replacing the compressor. • 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 88: Freeze Cycle

    Symptom #2 Low Production, Long Freeze Cycle Ice Machine has a Long Freeze Cycle. Ice Formation is Thick Thin Ice Fill on Top or Bottom of Evaporator Low Production How to Use the Freeze Cycle Refrigeration System Operational Analysis Table GENERAL These tables must be used with charts, checklists and other references to eliminate refrigeration components...
  • Page 89 PROCEDURE Step 1 Complete the “Operation Analysis” column. Read down the left “Operational Analysis” column. Perform all procedures and check all information listed. Each item in this column has supporting reference material to help analyze each step. While analyzing each item separately, you may find an “external problem”...
  • Page 90 Part Number: STH114_00 01/24...
  • Page 91 Part Number: STH114_00 01/24...
  • Page 92 Part Number: STH114_00 01/24...
  • Page 93 SYMPTOM #2 - FREEZE CYCLE REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLE PROCEDURES The following is the procedures for completing each step of the Symptom #2 - Freeze Cycle Refrigeration System Operational Analysis Tables see page 90. Each procedure must be performed exactly for the table to work correctly. Before Beginning Service Ice machines may experience operational problems only during certain times of the day or night.
  • Page 94 Ice Production Check The amount of ice a machine produces directly relates to the operating water and air temperatures. This means a condensing unit with a 70°F (21.2°C) outdoor ambient temperature and 50°F (10.0°C) water produces more ice than the same model condensing unit with a 90°F (32.2°C) outdoor ambient temperature and 70°F (21.2°C) water.
  • Page 95 Weighing the ice is the only 100% accurate check. However, if the ice pattern is normal and the 1/8 in. thickness is maintained, the ice slab weights listed with the 24-Hour Ice Production Charts may be used. 4. Compare the results of step 3 with step 2. Ice production is normal when these numbers match closely.
  • Page 96 Installation/Visual Inspection Checklist Inadequate Clearances • Check all clearances on sides, back and top. 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 97 Water dump valve leaking during the Freeze cycle • Clean/replace dump valve as needed Vent tube is not installed on water outlet drain • See Installation Instructions Hoses, fittings, etc., are leaking water • Repair/replace as needed Water fill valve or float is stuck open or closed •...
  • Page 98 Analyzing the ice formation pattern alone cannot diagnose an ice machine malfunction. However, when this analysis is used along with Manitowoc’s Symptom #2 - Refrigeration System Operational Analysis Table, it can help diagnose an ice machine malfunction. Any number of problems can cause improper ice formation.
  • Page 99 Ice Formation Pattern IB Models Tubing routing for Ice Beverage evaporators is different. The evaporator outlet is moved lower on the evaporator. • IB600 and IB800 evaporators outlets exit roughly 1/2 way down the evaporator. Extremely Thin at the Evaporator Outlet will first be visible near the middle of the evaporator •...
  • Page 100 Ice Formation Patterns 1. Normal Ice Formation Ice forms across the entire evaporator surface. At the beginning of the Freeze cycle, it may appear that more ice is forming at the evaporator inlet, than on the evaporator outlet. At the end of the Freeze cycle, ice formation at the outlet will be close to, or just a bit thinner than, ice formation at the inlet.
  • Page 101 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-Hour Ice Production/ Refrigeration Pressure Chart for ice machine being checked.
  • Page 102 • Overcharged • Non-condensible in system • Wrong type of refrigerant Other • Non-Manitowoc components in system • High side refrigerant lines/component restricted (before mid-condenser) • Defective head pressure control valve • Water Inlet Valve is incorrectly adjusted (CVD1486 only) NOTE: Do not limit your diagnosis to only the items listed in the checklists.
  • Page 103 Refer to “Installation/Visual Inspection Checklist” on page 96 Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Manitowoc components in system • High side refrigerant lines/component restricted (before mid-condenser) • Defective head pressure control valve • Defective fan cycle control •...

  • Page 104: Procedures

    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 105 Overcharged • Wrong type of refrigerant • Non-condensible in system Other • Non-Manitowoc components in system • Harvest valve leaking • TXV flooding (check bulb mounting) • Defective compressor NOTE: Do not limit your diagnosis to only the items listed in the checklists.
  • Page 106 Improper Refrigerant Charge • Undercharged • Wrong type of refrigerant Other • Non-Manitowoc components in system • Improper water supply over evaporator – refer to page 96 • Loss of heat transfer from tubing on back side of evaporator •...

  • Page 107: Normal Operation

    Harvest Valve The harvest 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 108 A small amount of leakage will cause an audible indication as the vapor passes through the valve. As the size of the leak increases, the audible indication becomes more apparent. If replacement is necessary, use only “original” Manitowoc replacement parts. Part Number: STH114_00 01/24...
  • Page 109 Analyzing Freeze Cycle Suction Line Temperature Suction line temperature cannot diagnose an ice machine. However, comparing this temperature during the freeze cycle, along with using Manitowoc’s Symptom #2 - Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.
  • Page 110 Final Analysis The column with the highest number of check marks identifies the refrigeration problem. COLUMN 1 - HARVEST VALVE LEAKING A leaking harvest valve must be replaced. COLUMN 2 - LOW CHARGE OR TXV STARVING Normally, a starving expansion valve only affects the freeze cycle pressures, not the harvest cycle pressures.
  • Page 111 COLUMN 4 - COMPRESSOR Replace the compressor and start components. To receive warranty credit, the compressor ports must be soldered closed to prevent oil leakage in transit. NOTE: This table must be used with charts, checklists and other references to eliminate refrigeration components not listed on the table and external items and problems, which can cause good refrigeration components to appear defective.

  • Page 112: Symptom #3 Ice Will Not Harvest

    Symptom #3 Ice Will Not Harvest ICE MACHINE WILL NOT HARVEST DIAGNOSTICS Ice release issues fall into two main categories mechanical or refrigeration. The first step in solving an ice release issue is to determine which condition exists. At the end of the harvest cycle place the toggle switch in the OFF position, then remove and inspect the sheet of ice.
  • Page 113 Harvest Problems Melted Out Ice Cube Normal Ice Cube Definition of a harvest problem; At the end of a 3.5 minute harvest cycle the slab of ice is still contacting the evaporator. The slab of ice may or may not be removable by hand.

  • Page 114: Are Not Melted Flowchart

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  • Page 118: Are Melted Flowchart

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  • Page 121: Component Check Procedures

    Component Check Procedures Electrical Components MAIN FUSE Function The control board fuse stops ice machine operation if electrical components fail, causing high amp draw. Specifications The main fuse is 250 Volt, 7 amp. Warning High (line) voltage is applied to the control board (terminals #55 and #56) at all times.

  • Page 122: Ice/Off/Clean Toggle Switch

    ICE/OFF/CLEAN TOGGLE SWITCH Function The switch is used to place the ice machine in ICE, OFF or CLEAN 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 123: Bin Switch

    BIN SWITCH Function Movement of the ice dampers control bin switch operation. 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 30 seconds during the Harvest cycle.

  • Page 124: Diagnostic Aids

    Symptoms Bin Switch Fails Open • The ice machine will not start with the toggle switch in the ice position, but runs normally with the toggle switch in the clean position. Bin Switch Fails Closed Safety limit 2 is recorded in the control board memory and the harvest cycle continues after the ice opens and closes the ice dampers (harvest cycle is 7 minutes for Quad evaporator models).

  • Page 125: Ice Damper Removal Notes

    Ice Damper Removal Notes The ice dampers must be on (bin switch closed) to start ice making. While a Freeze cycle is in progress, the dampers can be removed and installed at any time without interfering with the electrical control sequence. If the ice machine goes into Harvest sequence while the ice dampers are removed, one of the following will happen: •...

  • Page 126: Water Level Control Circuitry

    FREEZE CYCLE CIRCUITRY Manitowoc’s electronic sensing circuit does not rely on float switches or timers to maintain consistent water level control. During the Freeze cycle, the water inlet valve energizes and de-energizes in conjunction with the water level probe located in the water trough.
  • Page 127 After 45 seconds into the Freeze cycle: The water inlet valve will cycle ON, and then OFF one more time to refill the water trough. The water inlet valve is now OFF for the duration of the freeze cycle. Harvest Cycle Circuitry The water level probe does not control the water inlet valve during the harvest cycle.

  • Page 128: Diagnosing Water Level Control Circuitry

    DIAGNOSING WATER LEVEL CONTROL CIRCUITRY Problem: Water trough overfilling during the freeze cycle Step 1 Start a new Freeze sequence by moving the ICE/OFF/CLEAN toggle switch to OFF and then back to ICE. (if water flows with the switch off, check the water inlet valve).

  • Page 129: Water Trough Overfilling Continued

    WATER TROUGH OVERFILLING CONTINUED Step 4 Jumper wire connected from control board terminal to ground. Is Water The Water Flowing into The Water Inlet Valve Cause the Water Level Light Is: Solenoid Coil Trough? The water level probe is causing the problem.
  • Page 130 Important This restart must be done prior to performing diagnostic procedures. This ensures the ice machine is not in a freeze cycle water inlet valve safety shut- off mode. You must complete the entire diagnostics within 6 minutes of starting. Step 3 Disconnect the water level probe from the water level probe terminal on the control board.

  • Page 131: Ice Thickness Probe (Harvest Initiation)

    Ice Thickness Probe (Harvest Initiation) 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.

  • Page 132: Maximum Freeze Time

    MAXIMUM FREEZE TIME The control system includes a built-in safety which will automatically cycle the ice machine into harvest after 60 minutes in the freeze cycle. ICE THICKNESS CHECK The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (32 mm). NOTE: Make sure the water curtain/splash shields are in place when performing this check.

  • Page 133: Diagnosing Ice Thickness Control Circuitry

    Diagnosing Ice Thickness Control Circuitry PROBLEM: 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 ICE/OFF/CLEAN switch to OFF and back to ICE. Step 2 Wait until water starts to flow over the evaporator (freeze cycle).

  • Page 134: Ice Thickness Probe

    PROBLEM: 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 ICE/OFF/CLEAN switch to OFF and back to ICE. Step 2 Disconnect the ice thickness probe from the control board.

  • Page 135: Harvest Assist Air Pump

    Harvest Assist Air Pump FUNCTION The air pump breaks the vacuum between the sheet of ice and the evaporator which results in shorter harvest cycles. SPECIFICATIONS 115 Volt or 230 Volt - matches the ice machine voltage. CHECK PROCEDURE 1. Verify when the air pump should be running in the sequence of operation.

  • Page 136: Electronic Bin Thermostat Control

    ELECTRONIC BIN THERMOSTAT CONTROL The temperature control opens the bin switch circuit when ice contacts the sensor. When ice no longer contacts the sensor, the circuit closes and the ice machine starts. SPECIFICATIONS Setpoint Range: -30 to 212°F (-34 - 100°C) CONTROL SETTINGS Verify control is set properly before proceeding.
  • Page 137 KEYPAD JUMPER LOCATION RED LEAD SENSOR PROBE BLACK LEAD SENSOR PROBE MATCH WIRING TO ICE BIN SWITCH MACHINE WIRE VOLTAGE (RED) 240V COM 115V BIN SWITCH WIRE (WHITE) Inside of Bin Thermostat Control P4 Jumper The P4 jumper labeled Jump 1 is used to set the control for heating or cooling mode.
  • Page 138 SETTING CONTROL SETPOINT VALUE To view and adjust setpoint, follow these steps: 1. Press MENU until the display flashes SP. 2. Press MENU again to display the existing setpoint value. 3. Press Up or Down (arrows) to change the setpoint value.
  • Page 139 DIFFERENTIAL, ANTI-SHORT CYCLE DELAY, TEMPERATURE OFFSET, OR SENSOR FAILURE OPERATION To set or verify the Differential, Anti-Short Cycle Delay, Temperature Offset or Sensor Failure Operation use the following method. Factory Preset Temperature Control Code Settings as follows: 1. Press and hold MENU until the display changes to flashing SP.
  • Page 140 CHECK PROCEDURE Warning Line voltage is present inside control. Contact with line voltage can cause serious injury or death. If the control system does not function properly, verify that the control is wired and set up properly. If the problem persists use the following procedures to determine the cause of the problem.
  • Page 141 3. Check for proper operation. NOTE: Perform Steps 1 and 2 before performing this step. Disconnect the load from the output relay terminals. Reconnect the sensor leads and supply power to the control. Replace the cover. Check the control settings for proper values. Press and hold MENU until SP appears.

  • Page 142: Cleaning The Ice Thickness Or Water Level

    Cleaning the Ice Thickness or Water Level Probe Clean the probes using the following procedure. 1. Mix a solution of Manitowoc ice machine descaler and water (2 ounces of cleaner to 16 ounces of water) in a container. 2. Soak probes in container of cleaner/water solution while disassembling and cleaning water circuit components (soak probes for 10 minutes or longer).

  • Page 143: 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 144 Check Motor Windings to Ground Check continuity between all three terminals and the compressor shell or copper refrigeration line. Scrape metal surface to get good contact. If continuity is present, the compressor windings are grounded and the compressor should be replaced. Compressor Drawing Locked Rotor To determine if the compressor is seized, check the amp draw while the compressor is trying to start.

  • Page 145: 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 146: Relay

    RELAY The relay has a set of contacts that connect and disconnect the start capacitor from the compressor start winding. The contacts on the relay are normally closed (start capacitor in series with the start winding). The relay senses the voltage generated by the start winding and opens the contacts as the compressor motor starts.

  • Page 147: Refrigeration Components

    Refrigeration Components HIGH PRESSURE CUTOUT (HPCO) CONTROL ST3000W PROCEDURES Function Stops the ice machine if subjected to excessive high-side pressure. The HPCO control is normally closed, and opens on a rise in discharge pressure. Specifications Cut-Out Cut-In 600 psig ±10 450 psig ±10 (3147 kPa ±69 bar) (3103 kPa ±69 bar) Check Procedure...

  • Page 148: Sf3000C Procedures

    SF3000C PROCEDURES Function Stops the ice machine if subjected to excessive highside pressure. The HPCO control is normally closed, and opens on a rise in discharge pressure. Specifications Cut-Out Cut-In 450 psig ±10 300 psig ±10 (3103 kPa ±69 (2068 kPa ±69 31 bar ±0.69) 20.68 bar ±0.69) Automatic Reset...

  • Page 149: Low Pressure Cutout (Lpco) Control

    LOW PRESSURE CUTOUT (LPCO) CONTROL ST3000W PROCEDURES Function Signals the control board to energize and de-energize the ice machine when suction pressure rises above or falls below setpoint. The LPCO control is closed at pressures above setpoint and opens at pressures below setpoint. Two controls have been used and either will function correctly.

  • Page 150: Sf3000C Procedures

    SF3000C PROCEDURES Function Energizes and de-energizes the contactor coil when suction pressure rises above or falls below setpoint. The LPCO control is closed at pressures above setpoint and opens at pressures below setpoint. Specifications Cut-Out Cut-In 7 psig ±3 22 psig ±3 CHECK PROCEDURE 1.

  • Page 151: Water Regulating Valve

    Water Regulating Valve SELF-CONTAINED WATER-COOLED MODELS ONLY – ST3000W Function The water regulating valve maintains the freeze cycle discharge pressure. Valve Setting for the ST3000W 350 psig Set at 275 psig Flow Rate 14.0 GPM Setpoint Range 160-340 psig Check Procedure 1. Determine if the head pressure is high or low (refer to “Cycle Times/24-Hour Ice Production/Refrigerant Pressure Charts”...

  • Page 152: St3000W Harvest Pressure Solenoid Valve

    ST3000W Harvest Pressure Solenoid Valve FUNCTION Transfers refrigerant from the high side to the low side during the harvest cycle. CHECK PROCEDURE 1. Reset the ice machine with the toggle switch to override the 6 minute freeze lock. 2. Initiate a premature harvest by grounding the ice thickness probe.

  • Page 153: 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 154: Refrigerant Re-Use Policy

    REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’...

  • Page 155: St3000W Model Procedures

    Important Replace the liquid line drier after recovering the refrigerant and before evacuating and recharging. Use only a Manitowoc (OEM) liquid line filter-drier to prevent voiding the warranty. Connections Manifold gauge sets must utilize low loss fittings to comply with local rules and regulations.
  • Page 156 ST3000W RECOVERY/EVACUATION PROCEDURES 1. Press the Power button and cycle the ice machine off. 2. Install manifold gauge, scale and recovery unit or two-stage vacuum pump and open high, low and charging ports. 3. Perform recovery or evacuation: Recovery: Operate the recovery unit as directed by the manufacturer’s instructions.

  • Page 157: St3000W Charging Procedures

    ST3000W CHARGING PROCEDURES Important The charge is critical on all Manitowoc ice machines. Use a scale to ensure the proper charge is installed. 1. Be sure the ice machine is off. 2. Isolate the vacuum pump valve, low side and high side access valves from the refrigeration system.
  • Page 158 NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs. 7. Make sure that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses. Run the ice machine in freeze cycle.

  • Page 159: Sf3000C Model Procedures

    Important Replace the liquid line drier after recovering the refrigerant and before evacuating and recharging. Use only a Manitowoc (OEM) liquid line filter-drier to prevent voiding the warranty. Important Recovery/evacuation of a QuietQube® remote system requires connections at either 4 or 5 recovery points for complete system recovery/evacuation.

  • Page 160: Connections

    CONNECTIONS Manifold gauge sets must utilize low loss fittings to comply with U.S. Government rules and regulations. CVD condensing units with reciprocating compressors are manufactured with a check valve in the compressor discharge line. The check valve requires an additional connection on the condensing unit during evacuation or recovery procedures.

  • Page 161: Sf3000C Recovery/Evacuation Procedures

    SF3000C RECOVERY/EVACUATION PROCEDURES 1. Press the power button to stop the ice machine and disconnect all power to the ice machine and condensing unit. 2. Install manifold gauges, charging scale, and recovery unit or two-stage vacuum pump. 3. Open high and low side on the manifold gauge set. 4.

  • Page 162: Sf3000C Charging Procedures

    SF3000C CHARGING PROCEDURES 1. The ice machine must be off. 2. Close the vacuum pump valve and the low side manifold gauge valve. 3. Open the refrigerant cylinder and add the proper refrigerant charge (shown on nameplate) into the system high side (receiver service valve and discharge line shut-off valve).

  • Page 163: System Contamination Clean-Up

    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 164 Contamination Cleanup Chart Symptoms/Findings Required Cleanup Procedure • No symptoms or suspicion of Normal evacuation/recharging contamination procedure • Moisture/Air Contamination symptoms • Refrigeration system open to atmosphere for longer than 15 minutes • Refrigeration test kit and/ Mild contamination cleanup or acid oil test shows procedure contamination •...

  • Page 165: Cleanup Procedure

    Cleanup Procedure ST3000W MILD SYSTEM CONTAMINATION 1. Replace any failed components. 2. If the compressor is good, change the oil. Pour the oil from the compressor into a graduated vessel and replace with the same amount removed. 3. Replace the liquid line drier. NOTE: If the contamination is from moisture, use heat lamps during evacuation.

  • Page 166: St3000W Severe System Contamination

    ST3000W SEVERE SYSTEM CONTAMINATION 1. Remove the refrigerant charge. 2. Remove the compressor and inspect the refrigeration lines. If burnout deposits are found, install a new harvest valve, replace the manifold strainer, TXV and harvest pressure regulating valve. 3. Wipe away any burnout deposits from suction and discharge lines at compressor.
  • Page 167 9. Follow the normal evacuation procedure, except replace the evacuation step with the following: Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig (35 kPa, .35 bar). Change the vacuum pump oil. Pull vacuum to 500 microns.

  • Page 168: Sf3000C Mild System Contamination

    SF3000C MILD SYSTEM CONTAMINATION 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 169: Sf3000C Severe System Contamination

    SF3000C SEVERE SYSTEM CONTAMINATION 1. Remove the refrigerant charge. 2. Remove the compressor and inspect the refrigeration lines. If burnout deposits are found, install a new harvest valve and TXV. 3. Wipe away any burnout deposits from suction and discharge lines at compressor. 4.
  • Page 170 9. Follow the normal evacuation procedure, except replace the evacuation step with the following: Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psig (35 kPa, 0.35 bar). Change the vacuum pump oil. Pull vacuum to 500 microns.

  • Page 171: Sf3000C Liquid Line Filter-Driers

    SF3000C LIQUID LINE FILTER-DRIERS The filter-driers used on Manitowoc ice machines are manufactured to Manitowoc specifications. A Manitowoc drier has dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action that takes place during every Harvest cycle.

  • Page 172: Replacing Pressure Controls Without

    Replacing Pressure Controls Without Removing Refrigerant Charge ST3000W PROCEDURE 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. • Water regulating valve (water cooled only) •...

  • Page 173: Sf3000C Procedure

    SF3000C PROCEDURE 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 • Low Pressure cut-out control •...
  • Page 174 Using Pinch-Off Tool Part Number: STH114_00 01/24...

  • Page 175: Component Specifications

    Component Specifications MAIN FUSE The main control board fuse is 250 Volt, 7 amp. BIN SWITCH The bin switch is a magnetically operated reed switch. The magnet is attached to the lower right corner of the water curtain. The switch is attached to the right bulkhead wall. The bin switch is connected to a varying D.C.

  • Page 176: Water Regulating Valve

    WATER REGULATING VALVE SELF-CONTAINED WATER-COOLED MODELS ONLY – ST3000W Function The water regulating valve maintains the freeze cycle discharge pressure. Valve Setting for the ST3000W 350 psig Set at 275 psig Flow Rate 14.0 GPM Setpoint Range 160-340 psig Check Procedure 1. Determine if the head pressure is high or low (refer to “Cycle Times/24-Hour Ice Production/Refrigerant Pressure Charts”...

  • Page 177: Fan Cycle Control - Sf3000C Only

    FAN CYCLE CONTROL - SF3000C ONLY Specifications Cut-In (Close) Cut-Out (Open) First Condenser Fan 250 psig ±5 200 psig ±5 Second Condenser Fan 275 psig ±5 225 psig ±5 HIGH PRESSURE CUTOUT (HPCO) CONTROL ST3000W Specifications Cut-Out Cut-In 600 psig ±10 450 psig ±10 (3147 kPa ±69) (3103 kPa ±69) SF3000C Specifications...

  • Page 178: Filter-Driers

    The filter-driers 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 filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action that takes place during every Harvest cycle.

  • Page 179: Total System Refrigerant Charge

    Suction Line Filter - CVDF3000 Only The suction filter traps particulate only and does not contain a desiccant. The filter needs replacement when: 1. The pressure drop across the drier exceeds 2 psig. 2. The total system refrigerant charge has escaped and the refrigeration system has been exposed to the atmosphere.
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  • Page 181: Cycle Times/24-Hour Ice Production

    Charts Cycle Times/24-Hour Ice Production/ Refrigerant Pressure Charts These charts are used as guidelines to verify correct ice machine operation. Accurate collection of data is essential to obtain the correct diagnosis. • Production and cycle times are for dice cube - Half dice cube cycle times can be 2 - 3 minutes faster, depending on model and ambient temperature.

  • Page 182: For Sf3000C/Cvdf3000 Models Only

    FOR SF3000C/CVDF3000 MODELS ONLY • All pressure readings are taken at the ice machine head section. Connect Manifold gauge set at the suction and liquid line shut-off valves to obtain pressure readings Pressures taken at the condensing unit will vary with line set length, ambient, exposed line set etc.

  • Page 183: St3000W Series

    ST3000W SERIES SDT3000W Self Contained Water-Cooled All Dice Cube, Self-Contained Water-cooled Ice Machines Characteristics vary depending on operating conditions. All data on this page is preliminary and subject to change Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp.
  • Page 184 SYT3000W Self Contained Water-Cooled All Dice Cube, Self-Contained Water-cooled Ice Machines Characteristics vary depending on operating conditions. All data on this page is preliminary and subject to change Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Around Ice Harvest...

  • Page 185: Sf3000C Models

    SF3000C MODELS SDF3000C/CVDF3000 Series Characteristics vary depending on operating conditions. All data on this page is preliminary and subject to change Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Entering Harvest Water Temperature °F/°C Condenser Time ¹...
  • Page 186 SYF3000C/CVDF3000 Series Characteristics vary depending on operating conditions. All data on this page is preliminary and subject to change Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Entering Harvest Water Temperature °F/°C Condenser Time ¹...

  • Page 187: 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. Some components are wired differently on energy efficient machines.

  • Page 188: Water-Cooled Wiring Diagrams

    Water-Cooled Wiring Diagrams ST3000W Self-Contained - 3 Phase Part Number: STH114_00 01/24...

  • Page 189: Quietqube Wiring Diagrams

    QuietQube Wiring Diagrams Part Number: STH114_00 01/24...
  • Page 190 SF3000C 115/60/1 Part Number: STH114_00 01/24...
  • Page 191 SF3000C 230V/50Hz/1Ph Part Number: STH114_00 01/24...
  • Page 192 CVDF3000 - 1 Phase Part Number: STH114_00 01/24...
  • Page 193 CVDF3000 - 3 Phase Part Number: STH114_00 01/24...
  • Page 194 CVDF3000 380V/50hz/3ph Part Number: STH114_00 01/24...

  • Page 195: Electronic Control Board

    Electronic Control Board ST3000W & SF3000C Ice Machines AC LINE VOLTAGE PLUG FUSE 7A HARVEST VALVES CLEAN (YELLOW) HARVEST (RED) WATER LEVEL (GREEN) WATER SOLENOID (RED) LIQUID SOLENOID (RED) DUMP VALVE (RED) ICE PROBE WATER PUMP (RED) CURTAIN SWITCH 4 (GREEN) WATER LEVEL PROBE HARVEST VALVE 4 (RED) CURTAIN SWITCH 3 (GREEN)

  • Page 196: Refrigeration Tubing Schematics

    Refrigeration Tubing Schematics ST3000W Part Number: STH114_00 01/24...
  • Page 197 SF3000C Part Number: STH114_00 01/24...
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  • Page 200 MANITOWOC ICE 2110 SOUTH 26TH STREET MANITOWOC, WI 54220 800-545-5720 WWW.MANITOWOCICE.COM ©2024 Manitowoc Ice except where explicitly stated otherwise. All rights reserved. Part Number: STH114_00 01/24...

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