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Summary of Contents for Manitowoc S600M

• Page 1 Service Manual Thank you for selecting a Manitowoc Ice Machine, the dependability leader in ice making equipment and related products. With proper installation, care and maintenance, your new Manitowoc Ice Machine will provide you with many years of reliable and economical performance.

• Page 2: Safety Notices

  Caution statement before proceeding, valuable care and maintenance information. If you and work carefully. 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 3: Table Of Contents

  Ice Machine Dimensions ..... . S600M Water-Cooled Ice Machines ...
• Page 4 Table of Contents (continued) Cooling Tower Applications ....Water Supply and Drain Line Sizing/Connections .
• Page 5 Wiring Diagram Legend ....S600M - Self Contained - 1 Phase ....
• Page 6 S600M Series ....

• Page 7: General Information

  Section 1 General Information Section 1 General Information Model Numbers How to Read a Model Number This manual covers the following models: # CUBE SIZE CONDENSER TYPE DICE WATER-COOLED Self-Contained HALF-DICE WATER-COOLED Water-Cooled SD0603W MARINE MODEL SY0605W S Y 0605 W M NOTE: Model numbers ending in 3 indicate a 3-phase ICE MACHINE unit.

• Page 8: Accessories

  General Information Section 1 Accessories MANITOWOC CLEANER AND SANITIZER Manitowoc Ice Machine Cleaner and Sanitizer are Contact your Manitowoc distributor for these optional available in convenient 16 oz. (473 ml) bottles. These accessories: are the only cleaner and sanitizer approved for use with BIN CASTER Manitowoc products.

• Page 9: Model/serial Number Location

  These numbers are required when requesting The model and serial number are listed on the MODEL/ information from your local Manitowoc distributor, or SERIAL NUMBER DECAL affixed to the ice machine, Manitowoc Ice, Inc. remote condenser and storage bin. SV13147 MODEL/SERIAL DECAL..

• Page 10: Owner Warranty Registration Card

  2. The evaporator and compressor are covered by an your Manitowoc distributor or Manitowoc Ice, Inc. for the additional two (2) year (five years total) warranty name of the nearest authorized service representative.

• Page 11: Installation Instructions

  These instructions are provided to assist the qualified Important installer. Check your local Yellow Pages for the name of the nearest Manitowoc distributor, or call Manitowoc Ice, Failure to follow these installation guidelines may Inc. for information regarding start-up services.

• Page 12: Location Of Ice Machine

  Heat of Rejection following criteria. If any of these criteria are not met, Series Ice Machine select another location. Air Conditioning Peak S600M 9000 13900 • The location must be free of airborne and other B.T.U./Hour contaminants. Because the heat of rejection varies during the ice making cycle, the figure shown is an average.

• Page 13: Electrical Service

  ELECTRICAL REQUIREMENTS Refer to Ice Machine Model/Serial Plate for voltage/ amperage specifications. S Series Ice Machines Water Cooled Ice Machine Voltage Phase Cycle Maximum Fuse/Circuit Minimum Circuit Amps Breaker 208-230/1/60 S600M 230/1/50 Part Number 80-1630-3..

• Page 14: Self-contained Electrical Wiring Connections

  Installation Instructions Section 2 Self-Contained Electrical Wiring Connections SELF CONTAINED ICE MACHINE Warning 208-230/3/60 These diagrams are not intended to show proper wire routing, wire sizing, disconnects, etc., only the correct wire connections. All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes.

• Page 15: Water Supply And Drain Requirements

  Section 2 Installation Instructions Water Supply and Drain Requirements DRAIN CONNECTIONS Follow these guidelines when installing drain lines to WATER SUPPLY prevent drain water from flowing back into the ice Local water conditions may require treatment of the machine and storage bin: water to inhibit scale formation, filter sediment, and •..

• Page 16: Water Supply And Drain Line Sizing/connections

  Installation Instructions Section 2 WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS ! Caution Plumbing must conform to state and local codes. Tubing Size Up to Ice Location Water Temperature Water Pressure Ice Machine Fitting Machine Fitting 35°F (1.6°C) Min. 20 psi (137.9 kPA) Min. 3/8'..

• Page 17: Installation Check List

  Section 2 Installation Instructions Installation Check List Is the Ice Machine level? Are the ice machine and bin drains vented? Has all of the internal packing been Are all electrical leads free from contact with removed? refrigeration lines and moving equipment? Have all of the electrical and water Has the owner/operator been instructed connections been made?

• Page 18: Before Starting The Ice Machine

  Before Starting the Ice Machine AuCS Automatic Cleaning System ® All Manitowoc ice machines are factory-operated and This optional accessory monitors ice making cycles and adjusted before shipment. Normally, new installations do initiates cleaning procedures automatically. The AuCS® not require any adjustment.

• Page 19: Ice Machine Operation

  Section 3 Ice Machine Operation Section 3 Ice Machine Operation Component Identification Water Distribution Tube Toggle Switch Water Curtain Dump Valve Check Valve sv3149 Ice Thickness Probe Bin Switch Water Level Probe Water Inlet Location Water Pump Water Inlet Valve (Located in Refrigeration Compartment) sv3150 Part Number 80-1630-3..

• Page 20: Sequence Of Operation

  Ice Machine Operation Section 3 Sequence Of Operation NOTE: The toggle switch must be in the ice position and FREEZE SEQUENCE the water curtain must be in place on the evaporator 3. Prechill before the ice machine will start. The compressor is on for 30 seconds (60 seconds initial INITIAL START-UP OR START-UP AFTER cycle) prior to water flow, to prechill the evaporator.

• Page 21: Harvest Sequence

  Section 3 Ice Machine Operation HARVEST SEQUENCE SAFETY TIMERS 5. Water Purge The control board has the following non-adjustable safety timers: The harvest valve(s) opens at the beginning of the water purge to divert hot refrigerant gas into the evaporator. •..

• Page 22: Operational Checks

  The ice thickness probe is factory-set to maintain the ice GENERAL bridge thickness at 1/8' (.32 cm). Manitowoc ice machines are factory-operated and NOTE: Make sure the water curtain is in place when adjusted before shipment. Normally, new installations do performing this check.

• Page 23: Harvest Sequence Water Purge

  Section 3 Ice Machine Operation HARVEST SEQUENCE WATER PURGE • During the harvest sequence water purge, the water fill valve energizes and de-energizes by time. The The harvest sequence water purge adjustment may be water purge must be at the factory setting of 45 used when the ice machine is hooked up to special seconds for the water fill valve to energize during the water systems, such as a de-ionized water treatment..
• Page 24 Ice Machine Operation Section 3 THIS PAGE INTENTIONALLY LEFT BLANK Part Number 80-1630-3..

• Page 25: Maintenance

  Section 4 Maintenance Section 4 Maintenance General Water-Cooled Condenser and Water Regulating Valve You are responsible for maintaining the ice machine in accordance with the instructions in this manual. Symptoms of restrictions in the condenser water circuit Maintenance procedures are not covered by the include: warranty.

• Page 26: Guardian

  3. Clean the bin/dispenser. Flush the drain thoroughly S600M to prevent future drain blockage. Guardian™ sachet packets are available through your 4. Sanitize the bin/dispenser. local Manitowoc ice machine dealer. 5. Install a replacement sachet packet and reinstall all panels. Part Number 80-1630-3..

• Page 27: Interior Cleaning And Sanitizing

  Step 3 Wait about two minutes or until water starts to flow over the evaporator. ! Caution Step 4 Add the proper amount of Manitowoc Ice Use only Manitowoc approved Ice Machine Cleaner Machine Cleaner to the water trough. (part number 94-0546-3) and Sanitizer (part number 94-0565-3).

• Page 28: Sanitizing Procedure

  Maintenance Section 4 SANITIZING PROCEDURE Use sanitizer to remove algae or slime. Do not use it to Step 4 Use the sanitizing solution and a sponge or remove lime scale or other mineral deposits. cloth to sanitize (wipe) all parts and interior surfaces of the ice machine.

• Page 29: Removal Of Parts For Cleaning/sanitizing

  Section 4 Maintenance REMOVAL OF PARTS FOR CLEANING/SANITIZING 5. Use a soft-bristle brush or sponge (NOT a wire brush) to carefully clean the parts. 1. Turn off the electrical and water supply to the ice machine (and dispenser when applicable). ! Caution Do not mix Cleaner and Sanitizer solutions together.
• Page 30 Maintenance Section 4 1. Water Curtain 2. Ice Thickness Probe A. Gently flex the curtain in the center and remove A. Compress the hinge pin on the top of the ice it from the right side. thickness probe. B. Slide the left pin out. STEP 1 STEP 2 COMPRESS..
• Page 31 Section 4 Maintenance 3. Water Distribution Tube 4. Water Trough A. Depress tabs on right and left side of the water Warning trough. Removing the distribution tube while the water B. Allow front of water trough to drop as you pull pump is running will allow water to spray from ice forward to disengage the rear pins.
• Page 32 Maintenance Section 4 Water Level Probe Water Pump 1. Remove the water trough. Warning Disconnect the electric power to the ice machine at Warning the electric service switch box and turn off the water Disconnect the electrical power to the ice machine supply before proceeding.
• Page 33 Section 4 Maintenance Water Dump Valve Important The water dump valve normally does not require The plunger and the inside of the enclosing tube removal for cleaning. To determine if removal is must be completely dry before assembly. necessary: 1. Locate the water dump valve. NOTE: During cleaning, do not stretch, damage or 2.
• Page 34 Maintenance Section 4 Evaporator Tray Removal Drain Line Check Valve 1. Remove the water trough. The drain line check valve normally does not require removal for cleaning. Water loss from the sump trough 2. Remove thumbscrew on left side of tray. will indicate removal and cleaning are required.
• Page 35 Section 4 Maintenance Water Inlet Valve The water inlet valve normally does not require removal for cleaning. Refer to Section 5 for a list of causes for “No Water Entering Water Trough” or “Water Overflows Water Trough. 1. When the ice machine is off, the water inlet valve must completely stop water flow into the machine.

• Page 36: Removal From Service/winterization

  Maintenance Section 4 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 37: Before Calling For Service

  Section 5 Before Calling For Service Section 5 Before Calling For Service Checklist If a problem arises during operation of your ice machine, follow the checklist below before calling service. Routine adjustments and maintenance procedures are not covered by the warranty. Problem Possible Cause To Correct..

• Page 38: Safety Limit Feature

  In addition to the standard safety controls, such as the A. If the safety limit feature has stopped the ice high pressure cutout, your Manitowoc ice machine machine, it will restart after a short delay. features built-in safety limits which will stop the ice Proceed to step 2.
• Page 39 Section 5 Before Calling For Service THIS PAGE INTENTIONALLY LEFT BLANK Part Number 80-1630-3..
• Page 40 Before Calling For Service Section 5 THIS PAGE INTENTIONALLY LEFT BLANK Part Number 80-1630-3..

• Page 41: Electrical System

  Section 6 Electrical System Section 6 Electrical System Energized Parts Charts SELF-CONTAINED WATER-COOLED MODELS Control Board Relays Contactor Ice Making Length Sequence Of Harvest Harvest Water Cond. Of Time Water Dump Contactor Operation Valve Valve Inlet Comp. Pump Comp.* Valve Coil (Left) (Right)*..

• Page 42: Wiring Diagram Sequence Of Operation

  Electrical System Section 6 Wiring Diagram Sequence of L2 or N Operation Ground Water Valve (21) SELF-CONTAINED MODELS (20) (55) (99) (89) (61) (22) High Initial Start-Up or Start-Up After Control Board Harvest Valve Pressure (77) Automatic Shut-Off Cutout (88) (60) (80) Dump Valve..
• Page 43 Section 6 Electrical System 2. REFRIGERATION SYSTEM L2 or N START-UP Ground Water Valve (99) (21) (20) The compressor starts after the 45- (55) (89) (61) (22) second water purge, and it remains High Control Board Harvest Valve Pressure on throughout the Freeze and (77) Cutout (88)
• Page 44 Electrical System Section 6 Freeze Sequence L2 or N 3. PRE-CHILL Ground Water Valve (99) (21) (20) (55) (89) To pre-chill the evaporator, the (22) (61) High compressor runs for 30 seconds (60 Control Board Harvest Valve Pressure (77) seconds initial cycle) prior to water Cutout (88) (60)
• Page 45 Section 6 Electrical System 4. FREEZE L2 or N Ground The water pump starts after the pre- Water Valve (99) (21) (20) chill. An even flow of water is directed (55) (89) (22) (61) across the evaporator and into each High Control Board Harvest Valve..
• Page 46 Electrical System Section 6 Harvest Sequence L2 or N Ground 5. WATER PURGE Water Valve (99) (21) (20) (55) (89) The harvest valve(s) opens at the (22) (61) High beginning of the water purge to divert Control Board Harvest Valve Pressure (77) Cutout..
• Page 47 Section 6 Electrical System 6. HARVEST L2 or N Ground The harvest valve(s) remains open Water Valve (99) (21) (20) and the refrigerant gas warms the (55) (89) (22) (61) evaporator. This causes the cubes to High Control Board Harvest Valve Pressure slide, as a sheet, off the evaporator (77)
• Page 48 Electrical System Section 6 Automatic Shut-Off 7. AUTOMATIC SHUT-OFF L2 or N Ground When the storage bin is full at the Water Valve (99) (21) (20) end of a harvest cycle, the sheet of (55) (89) (22) (61) cubes fails to clear the water curtain High Control Board Harvest Valve..

• Page 49: Wiring Diagrams

  Section 6 Electrical System Wiring Diagrams The following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice machine which 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 overloads)

• Page 50: S600m - Self Contained - 1 Phase

  Electrical System Section 6 S600M - SELF CONTAINED - 1 PHASE L2 or N Ground (99) Water Valve (20) (21) (89) (55) (22) (61) Control Harvest Valve High Pressure Board Cutout (77) (88) (60) (80) Dump Valve (76) (75) (81)

• Page 51: Component Specifications And Diagnostics

  Section 6 Electrical System Component Specifications and Diagnostics MAIN FUSE BIN SWITCH Function Function The control board fuse stops ice machine operation if Movement of the water curtain controls bin switch electrical components fail causing high amp draw. operation. The bin switch has two main functions: Specifications 1.
• Page 52 Electrical System Section 6 Symptoms Water Curtain Removal Notes Bin Switch Fails Open The water curtain must be on (bin switch closed) to start ice making. While a freeze cycle is in progress, the water • The ice machine will not start with the toggle switch curtain can be removed and installed at any time without in the ice position, but runs normally with the toggle interfering with the electrical control sequence.

• Page 53: Compressor Electrical Diagnostics

  Section 6 Electrical System COMPRESSOR ELECTRICAL DIAGNOSTICS Determine if the Compressor is Seized The compressor will not start or will trip repeatedly on Check the amp draw while the compressor is trying to overload. start. Check Resistance (Ohm) Values COMPRESSOR DRAWING LOCKED ROTOR NOTE: Compressor windings can have very low ohm The two likely causes of this are: values.

• Page 54: Ptcr Diagnostics

  Electrical System Section 6 PTCR DIAGNOSTICS Compressor Start Sequence What is a PTCR? PTCR’s provide additional starting torque by increasing the current in the auxiliary (start) winding during starting. A PTCR (or Positive Temperature Coefficient Resistor) is The PTCR is wired across the run capacitor (in series made from high-purity, semi-conducting ceramics.
• Page 55 Section 6 Electrical System S-Model Automatic Shut-Off and Restart Troubleshooting PTCR’s When the storage bin is full at the end of a harvest cycle, WHY A GOOD PTCR MAY FAIL the sheet of cubes fails to clear the water curtain and will TO START THE COMPRESSOR hold it open.
• Page 56 • The voltage at the compressor during start-up is too low. Manitowoc ice machines are rated at ±10% of nameplate voltage at compressor start-up. (Ex: An ice machine rated at 208-230 should have a compressor start-up voltage between 187 and 253 volts.)

• Page 57: Diagnosing Start Components

  Section 6 Electrical System DIAGNOSING START COMPONENTS ICE/OFF/CLEAN TOGGLE SWITCH If the compressor attempts to start, or hums and trips the Function overload protector, check the start components before The switch is used to place the ice machine in ICE, OFF replacing the compressor.

• Page 58: Electronic Control Board

  Electrical System Section 6 ELECTRONIC CONTROL BOARD N 115V L2 208-230V PRIMARY POWER SUPPLY AC LINE VOLTAGE ELECTRICAL PLUG (NUMBERS MARKED ON WIRES) MAIN FUSE (7A) AIR COMPRESSOR (NOT USED ON ALL MODELS) WATER PURGE CLEAN LIGHT (YELLOW) ADJUSTMENT LEFT BIN LIGHT (GREEN) RIGHT BIN LIGHT (GREEN) REMOTE BIN LIGHT (GREEN) WATER LEVEL LIGHT (GREEN)
• Page 59 Section 6 Electrical System General Inputs S-Model control boards use a dual voltage transformer. The control board, along with inputs, controls all This means only one control board is needed for both electrical components, including the ice machine 115V and 208-230V use. sequence of operation.

• Page 60: Ice Thickness Probe (harvest Initiation)

  The ice machine control system incorporates a freeze time lock-in feature. This prevents the ice machine from 1. Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of short cycling in and out of harvest.

• Page 61: Diagnosing Ice Thickness Control Circuitry

  Section 6 Electrical System 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 ICE/OFF/CLEAN switch to OFF and back to ICE. Step 2 Wait until the water starts to flow over the evaporator (freeze cycle).

• Page 62: Water Level Control Circuitry

  Electrical System Section 6 Water Level Control Circuitry FREEZE CYCLE CIRCUITRY Manitowoc’s electronic sensing circuit does not rely on WATER LEVEL PROBE LIGHT float switches or timers to maintain consistent water The water level probe circuit can be monitored by level control.

• Page 63: Diagnosing Water Level Control Circuitry

  Section 6 Electrical System DIAGNOSING WATER LEVEL CONTROL CIRCUITRY Problem: Water Trough Overfilling During The Step 2 Wait until the freeze cycle starts Freeze Cycle (the freeze cycle starts when the water pump energizes). Step 1 Start a new freeze sequence by moving the ICE/ Step 3 Disconnect water level probe wire from control OFF/CLEAN toggle switch to OFF, then back to ICE.
• Page 64 Electrical System Section 6 Problem: Water Will Not Run Into The Sump Trough Step 2 Wait until the freeze cycle starts (approximately During The Freeze Cycle 45 seconds, the freeze cycle starts when the compressor energizes). Step 1 Verify water is supplied to the ice machine, and then start a new freeze sequence by moving the ICE/ Step 3 Disconnect the water level probe from the water OFF/CLEAN toggle switch to OFF then back to ICE.

• Page 65: Diagnosing An Ice Machine That Will Not Run

  Section 6 Electrical System Diagnosing An Ice Machine 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 66 Electrical System Section 6 S600M - SELF CONTAINED - 1 PHASE WITH TERMINAL BOARD SV2071 6-26 Part Number 80-1630-3..

• Page 67: Refrigeration System

  Section 7 Refrigeration System Section 7 Refrigeration System Sequence of Operation SELF-CONTAINED WATER -COOLED MODELS EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR AIR OR WATER STRAINER CONDENSER DRIER RECEIVER (WATER COOLED ONLY) HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1569..
• Page 68 Refrigeration System Section 7 E V A P O R A T O R H E A T E X C H A N G E R E X P A N S I O N V A L V E H O T G A S S O L E N O I D V A L V E A I R O R W A T E R C O M P R E S S O R..

• Page 69: Operational Analysis (diagnostics)

  Section 7 Refrigeration System Operational Analysis (Diagnostics) 2. An ice machine that is low on charge may cause a good expansion valve to starve. If a service GENERAL technician fails to verify the system charge, he may When analyzing the refrigeration system, it is important replace the expansion valve in error.

• Page 70: Before Beginning Service

  Refrigeration System Section 7 BEFORE BEGINNING SERVICE 2. Refer to the appropriate 24 Hour Ice Production Chart. Use the operating conditions determined in Ice machines may experience operational problems only Step 1 to find published 24 hour ice production. during certain times of the day or night. A machine may function properly while it is being serviced, but 3.

• Page 71: Installation/visual Inspection Checklist

  Section 7 Refrigeration System INSTALLATION/VISUAL INSPECTION CHECKLIST WATER SYSTEM CHECKLIST A water-related problem often causes the same Possible Problem Corrective Action symptoms as a refrigeration system component Ice machine is not level Level the ice machine malfunction. Condenser is dirty Clean the condenser Water system problems must be identified and Water filtration is plugged (if..

• Page 72: Ice Formation Pattern

  Refrigeration System Section 7 ICE FORMATION PATTERN 2. Extremely Thin at Evaporator Outlet Evaporator ice formation pattern analysis is helpful in ice There is no ice, or a considerable lack of ice formation at machine diagnostics. the outlet of the evaporator. Analyzing the ice formation pattern alone cannot Examples: No ice at all at the outlet half of the diagnose an ice machine malfunction.
• Page 73 Section 7 Refrigeration System 3. Extremely Thin at Evaporator Inlet 5. No Ice Formation There is no ice, or a considerable lack of ice formation at The ice machine operates for an extended period, but the inlet of the evaporator. Examples: The ice at the there is no ice formation at all on the evaporator.

• Page 74: Safety Limits

  Refrigeration System Section 7 SAFETY LIMITS Analyzing Why Safety Limits May Stop the Ice Machine General According to the refrigeration industry, a high percentage In addition to standard safety controls, such as high of compressors fail as a result of external causes. These pressure cut-out, the control board has two built in safety can include: flooding or starving expansion valves, dirty limit controls which protect the ice machine from major..
• Page 75 Section 7 Refrigeration System Safety Limit #1 Refer to previous page for safety limit operation. Freeze time exceeds 60 minutes for 6 consecutive freeze cycles. Possible Cause Check/Correct Improper installation See “Installation/Visual Inspection Checklist” Water system Low water pressure [20 psi (138 kPa) min.] High water pressure [80 psi (552 kPa) max.] High water temperature (90°F/32.2°C max.) Clogged water distribution tube..
• Page 76 Refrigeration System Section 7 Safety Limit #2 Refer to page 7-11 for safety limit operation. Harvest time exceeds 3.5 minutes for 500 consecutive harvest cycles. Possible Cause Check/Correct Improper installation See “Installation/Visual Inspection Checklist” Water system Water area (evaporator) dirty Dirty/defective water dump valve Vent tube not installed on water outlet drain Water freezing behind evaporator..

• Page 77: Analyzing Discharge Pressure During Freeze Or Harvest Cycle

  Section 7 Refrigeration System ANALYZING DISCHARGE PRESSURE 3. Perform an actual discharge pressure check. DURING FREEZE OR HARVEST CYCLE Procedure Freeze Cycle Harvest Cycle PSIG (kPa) PSIG (kPa) 1. Determine the ice machine operating conditions: Beginning of Cycle __________ __________ Middle of Cycle __________ __________..

• Page 78: Analyzing Suction Pressure During Freeze Cycle

  Refrigeration System Section 7 ANALYZING SUCTION PRESSURE NOTE: Analyze discharge pressure before analyzing DURING FREEZE CYCLE suction pressure. High or low discharge pressure may be causing high or low suction pressure. The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperatures entering the ice machine change.
• Page 79 Section 7 Refrigeration System Freeze Cycle Suction Pressure High Checklist Possible Cause Check/Correct Improper installation See “Installation/Visual Inspection Checklist” Discharge pressure Discharge pressure is too high, and is affecting low side (See “Freeze Cycle Discharge Pressure High Checklist” ) Improper refrigerant charge Overcharged Wrong type of refrigerant Other..

• Page 80: Single Expansion Valve Ice Machines - Comparing Evaporator Inlet And Outlet Temperatures

  Refrigeration System Section 7 SINGLE EXPANSION VALVE ICE MACHINES - Use this procedure to document freeze cycle inlet and COMPARING EVAPORATOR INLET AND outlet temperatures. OUTLET TEMPERATURES 1. Use a quality temperature meter, capable of taking NOTE: This procedure will not work on the dual temperature readings on curved copper lines.

• Page 81: Harvest Valve Temperature Check

  Section 7 Refrigeration System HARVEST VALVE TEMPERATURE CHECK 3. Feel the compressor discharge line. General Warning A harvest valve requires a critical orifice size. This The inlet of the harvest valve and the compressor meters the amount of hot gas flowing into the evaporator discharge line could be hot enough to burn your during the harvest cycle.

• Page 82: Discharge Line Temperature Analysis

  Refrigeration System Section 7 DISCHARGE LINE TEMPERATURE ANALYSIS Procedure General Connect a temperature probe on the compressor discharge line with-in 6' of the compressor and insulate. Knowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important Observe the discharge line temperature for the last three diagnostic tool.

• Page 83: How To Use The Refrigeration System Operational Analysis Tables

  Section 7 Refrigeration System HOW TO USE THE REFRIGERATION SYSTEM Final Analysis OPERATIONAL ANALYSIS TABLES The column with the highest number of check marks General identifies the refrigeration problem. These tables must be used with charts, checklists and COLUMN 1 - HARVEST VALVE LEAKING other references to eliminate refrigeration components A leaking harvest valve must be replaced.

• Page 84: Refrigeration System Operational Analysis Tables

  Refrigeration System Section 7 REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES S Models Single Expansion Valve - Ice Machine Model Number_________________ 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 85: Pressure Control Specifications And Diagnostics

  Section 7 Refrigeration System Pressure Control Specifications and Diagnostics HIGH PRESSURE CUT-OUT (HPCO) CONTROL Function Stops the ice machine if subjected to excessive high- side pressure. The HPCO control is normally closed, and opens on a rise in discharge pressure. Specifications Cut-out: 450 psig ±10 (3103 kPa ±69, 31 Bar ±.69)

• Page 86: Cycle Time/24 Hour Ice Production/refrigerant Pressure Charts

  Refrigeration System Section 7 Cycle Time/24 Hour Ice Production/ S600M SERIES Refrigerant Pressure Charts Self-Contained Water-Cooled These charts are used as guidelines to verify correct ice NOTE: These characteristics may vary depending on machine operation. operating conditions. Accurate collection of data is essential to obtain the Cycle Times correct diagnosis.

• Page 87: Refrigerant Recovery/evacuation And Recharging

  Follow the two-stage vacuum pump. manufacturer’s recommendations. MANIFOLD SET Important OPEN OPEN Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is BACKSEATED BACKSEATED LOW SIDE HIGH SIDE the sole responsibility of the servicing company.
• Page 88 3. Open the high side manifold gauge valve, and backseat the high side service valve. The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to 4. Open the charging cylinder and add the proper ensure the proper charge is installed.
• Page 89 Section 7 Refrigeration System EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVES LOW SIDE SERVICE VALVE (BACKSEATED) COMPRESSOR STRAINER HARVEST PRESSURE HARVEST CHECK SOLENOID PRESSURE VALVE VALVE REGULATING VALVE HIGH SIDE LIQUID SERVICE VALVE LINE (BACKSEATED) SOLENOID DISCHARGE LINE QUICK CONNECT DRIER SCHRAEDER FITTING..
• Page 90 Refrigeration System Section 7 Remote Charging Procedures NOTE: Backseat the receiver outlet service valve after charging is complete and before operating the ice 1. Be sure the toggle switch is in the OFF position. machine. If the access valve core removal and 2.

• Page 91: Part Number

  Section 7 Refrigeration System HEAT EXCHANGER EVAPORATOR EXPANSION VALVE HOT GAS SOLENOID VALVES LOW SIDE SERVICE VALVE (BACKSEATED) STRAINER COMPRESSOR HARVEST PRESSURE HARVEST SOLENOID CHECK PRESSURE VALVE VALVE REGULATING VALVE HIGH SIDE LIQUID SERVICE VALVE LINE (BACKSEATED) SOLENOID DISCHARGE LINE DRIER QUICK CONNECT SCHRAEDER FITTING..

• Page 92: System Contamination Clean-up

  If a refrigerant test kit indicates harmful levels of Important contamination, or if a test kit is not available, inspect the Manitowoc Ice, Inc. assumes no responsibility for compressor oil. the use of contaminated refrigerant. Damage 1. Remove the refrigerant charge from the ice resulting from the use of contaminated refrigerant is machine.
• Page 93 Section 7 Refrigeration System Mild System Contamination Cleanup Procedure Severe System Contamination Cleanup Procedure 1. Replace any failed components. 1. Remove the refrigerant charge. 2. If the compressor is good, change the oil. 2. Remove the compressor. 3. Replace the liquid line drier. 3.

• Page 94: Replacing Pressure Controls Without Removing Refrigerant Charge

  Refrigeration System Section 7 10. Follow the normal evacuation procedure, except REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE replace the evacuation step with the following: This procedure reduces repair time and cost. Use it Important when any of the following components require replacement, and the refrigeration system is operational Dry nitrogen is recommended for this procedure.
• Page 95 Section 7 Refrigeration System SV1406 Figure 7-11. Using Pinch-Off Tool 7-29 Part Number 80-1630-3..

• Page 96: Filter-driers

  Refrigeration System Section 7 FILTER-DRIERS The filter-driers used on Manitowoc ice machines are TOTAL SYSTEM REFRIGERANT CHARGES manufactured to Manitowoc specifications. Important The difference between Manitowoc driers and off-the- shelf driers is in filtration. Manitowoc driers have dirt- This information is for reference only. Refer to the..

• Page 97: Refrigerant Definitions

  Section 7 Refrigeration System REFRIGERANT DEFINITIONS Reclaim Recover To reprocess refrigerant to new product specifications (see below) by means which may include distillation. A To remove refrigerant, in any condition, from a system chemical analysis of the refrigerant is required after and store it in an external container, without necessarily processing to be sure that product specifications are testing or processing it in any way.

• Page 98: Refrigerant Re-use Policy

  Important • Recovered refrigerant must come from a Manitowoc Ice, Inc. assumes no responsibility for “contaminant-free” system. To decide whether use of contaminated refrigerant. Damage resulting the system is contaminant free, consider: from the use of contaminated, recovered, or –..

• Page 99: Hfc Refrigerant Questions And Answers

  Section 7 Refrigeration System HFC REFRIGERANT QUESTIONS AND ANSWERS Manitowoc uses R-404A and R-134A HFC refrigerants with ozone depletion potential (ODP) factors of zero (0.0). R- 404A is used in ice machines and reach-in freezers and R-134A is used in reach-in refrigerators. 1.
• Page 100 Refrigeration System Section 7 THIS PAGE INTENTIONALLY LEFT BLANK 7-34 Part Number 80-1630-3..
• Page 101 Section 7 Refrigeration System THIS PAGE INTENTIONALLY LEFT BLANK 7-35 Part Number 80-1630-3..
• Page 103 • Improve Your Service Techniques • Network with Your Peers • 4 1/2 Days of Intensive Training on Manitowoc Ice Machines • Extensive “Hands On” Training on a Variety of Equipment • Breakfast, Lunch and Hotel Room Included with Tuition •..