S Model Ice Machines 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. This manual is updated as new information and models are released. Visit our website for the latest manual. www.manitowocice.
Safety Notices Procedural Notices As you work on a S-Series Ice Machine, be sure to pay close attention to the safety notices in this manual. Disregarding the notices may lead to serious injury and/ or damage to the ice machine. As you work on a S-Series Ice Machine, be sure to read the procedural notices in this manual. These notices supply helpful information which may assist you as you work.
Attend A Manitowoc Factory Service School • 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 • Contact Your Distributor or Manitowoc Ice, Inc. for Details OR • Visit Our Website at www.manitowocice.com for School Dates MANITOWOC ICE, INC. 2110 South 26th Street P.O.
Table of Contents Section 1 General Information Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Read a Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ice Cube Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bin Caster . . . .
Table of Contents (continued) Remote Electrical Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Ice Machine With Single Circuit Model Condenser 115/1/60 or 208-230/1/60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Ice Machine With Single Circuit Model Condenser 208-230/3/60 or 380-415/3/50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Ice Machine With Single Circuit Model Condenser 230/1/50 . . . . .
Table of Contents (continued) Section 4 Maintenance General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ice Machine Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents (continued) Ice Thickness Probe (Harvest Initiation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How The Probe Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Harvest Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Freeze Time Lock-In Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Freeze Time . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents (continued) Refrigerant Recovery/Evacuation and Recharging . . . . . . . . . . . . . . . . . . . . Normal Self-Contained Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . . Normal Remote Model Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Contamination Clean-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing Pressure Controls Without Removing Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents (continued) 6 Part No.
Section 1 General Information Section 1 General Information Model Numbers How to Read a Model Number This manual covers the following models: Self-Contained Air-Cooled SD0302A SY0304A SD0322A SY0324A SR0420A SD0422A SY0424A SD0452A SY0454A SR0500A SD0502A SY0504A SD0602A SY0604A SR0850A SD0852A SY0854A SD1002A SY1004A SD1402A SY1404A SR1800A SD1802A SY1804A Self-Contained Water-Cooled SD0303W SY0305W SD0323W SY0325W SR0421W SD0423W SY0425W SD0453W SY0455W SR501W SD0503W SY0505W SD0603W SY0605W SR0851W
General Information Section 1 Accessories MANITOWOC CLEANER AND SANITIZER Contact your Manitowoc distributor for these optional accessories: Manitowoc Ice Machine Cleaner and Sanitizer are available in convenient 16 oz. (473 ml) bottles. These are the only cleaner and sanitizer approved for use with Manitowoc products. BIN CASTER Replaces standard legs. ICE BAGGER Maximize profits from bagged ice sales with this convenient accessory.
Section 1 General Information Model/Serial Number Location These numbers are required when requesting information from your local Manitowoc distributor, or Manitowoc Ice, Inc. The model and serial number are listed on the MODEL/ SERIAL NUMBER DECAL affixed to the ice machine, remote condenser and storage bin.
General Information Section 1 Owner Warranty Registration Card GENERAL EXCLUSIONS The packet containing this manual also includes warranty information. Warranty coverage begins the day your new ice machine is installed. The following items are not included in the ice machine’s warranty coverage: Important Complete and mail the OWNER WARRANTY REGISTARATION CARD as soon as possible to validate the installation date.
Section 2 Installation Instructions Section 2 Installation Instructions General These instructions are provided to assist the qualified installer. Check your local Yellow Pages for the name of the nearest Manitowoc distributor, or call Manitowoc Ice, Inc. for information regarding start-up services. Important Failure to follow these installation guidelines may affect warranty coverage. Ice Machine Dimensions S320/S420 AIR AND WATER-COOLED ICE MACHINES ELECTRICAL AUCS ELECTRICAL 2.20" (5.58cm) 5.
Installation Instructions Section 2 S600 AIR AND WATER-COOLED ICE MACHINES H 1.50" (3.81cm) ELECTRICAL 8.50" (21.60cm) A AUCS CONNECTIONS 6.50" (16.5cm) B CONDENSER WATER OUTLET 1/2"FPT (Water-Cooled Only) 2.61" (6.62cm) 5.06" (12.85cm) 1.81" 6.68" (16.96cm) (4.59cm) 2.85" (7.30cm) D AUXILLARY BASE DRAIN 1/2"CPVC SOCKET CONDENSER WATER INLET 3/8"FPT (Water-Cooled Only) DRAIN 1/2"NPTF 7.75" (19.7 cm) WATER INLET 3/8"FPT 4.25" (10.81 cm) 17.25" (43.81 cm) W Ice Machine S600 Dimension A 11.
Section 2 Installation Instructions S300/S450/S500/S850/S1000 AIR AND WATER-COOLED ICE MACHINES ELECTRICAL 2.20" (5.58cm) H A B C E 1.81" (4.59cm) 2.61" (6.62cm) AUCS CONNECTIONS F 4.21" (10.69cm) 2.85" (7.30cm) 5.06" (12.85cm) 1.06 (2.7cm) 6.68" (16.96cm) CONDENSER WATER OUTLET 1/2"FPT (Water-Cooled Only) D AUXILLARY BASE DRAIN 1/2"CPVC SOCKET 8.49" (21.56cm) 25.52" (64.
Installation Instructions Section 2 S500/S850/S1000 REMOTE ICE MACHINES ELECTRICAL REMOTE CONDENSER ELECTRICAL 2.20" (5.58cm) A H B 1.81" (4.59cm) 2.61" (6.62cm) 1.06 (2.69cm) 6.12" (15.54cm) D 5.06" (12.85cm) 6.68" (16.96cm) 12.26" (42.27cm) WATER INLET 3/8"FPT 16.64" (64.82cm) DRAIN 1/2"NPTF SV3146 Ice Machine S300 S450 S500 S850 S1000 2-4 W Dimension A 14.00 in (35.6 cm) 19.25 in (48.9 cm) 19.25 in (48.9 cm) 23.82 in (60.5 cm) 23.82 in (60.5 cm) Dimension B NA 17.5 in (44.
Section 2 Installation Instructions S1400 / S1800 AIR AND WATER-COOLED ICE MACHINES 2.50" (6.35cm) ELECTRICAL H A B C 11.0" (27.9cm) AuCS Connections E 2.0" (5.1cm) F WATER INLET 3/8"FPT 5.75" (14.6cm) CONDENSER WATER OUTLET 1/2"FPT (Water-Cooled Only) 1.1" (2.8cm) 4.0" 7.8" (19.8cm) (10.2cm) 10.25" (26.0cm) CONDENSER WATER INLET 3/8"FPT (Water-Cooled Only) D 3.0" (7.6cm) 11.0" (27.9cm) 3.75" (9.
Installation Instructions Section 2 Ice Storage Bin Dimensions 30 INCH (76 CM) ICE STORAGE BINS 48 INCH (130 CM) ICE STORAGE BINS SV1609 Bin Model B170 B420 B570 SV1297 Dimension A 29.5 in (74.9 cm) 34.0 in (86.3 cm) 34.0 in (86.3 cm) Dimension B 19.1 in (48.5 cm) 32.0 in (81.3 cm) 44.0 in (111.7 cm) B970 Remote Condenser Dimensions JC0495/JC0895/JC1395 22 INCH (56 CM) ICE STORAGE BINS SV1297 SV1614 Bin Model B320 B420 2-6 Dimension A 34.0 in (86.3 cm) 34.0 in (86.3 cm) Dimension B 32.
Section 2 Installation Instructions Location of Ice Machine Ice Machine Heat of Rejection The location selected for the ice machine must meet the following criteria. If any of these criteria are not met, select another location. • The location must be free of airborne and other contaminants. • The air temperature must be at least 35°F (1.6°C), but must not exceed 110°F (43.4°C).
Installation Instructions Section 2 Removing Drain Plug and Leveling the Ice Storage Bin 1. Remove threaded plug from drain fitting. 2. Screw the leveling legs onto the bottom of the bin. 3. Screw the foot of each leg in as far as possible. ! Caution The legs must be screwed in tightly to prevent them from bending. Air-Cooled Baffle SELF-CONTAINED AIR-COOLED ONLY The air-cooled baffle prevents condenser air from recirculating. To install: 1. Remove the back panel screws next to the condenser. 2.
Section 2 Installation Instructions Electrical Service Important GENERAL Observe correct polarity of incoming line voltage. ! Warning All wiring must conform to local, state and national codes. VOLTAGE The maximum allowable voltage variation is ±10% of the rated voltage at ice machine start-up (when the electrical load is highest). ! Warning The ice machine must be grounded in accordance with national and local electrical codes.
Installation Instructions Section 2 Self-Contained Electrical Wiring Connections ! Warning These diagrams are not intended to show proper wire routing, wire sizing, disconnects, etc., only the correct wire connections. SELF CONTAINED ICE MACHINE 208-230/3/60 All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes. Though wire nuts are shown in the drawings, the ice machine field wiring connections may use either wire nuts or screw terminals.
Section 2 Installation Instructions Remote Electrical Wiring Connections REMOTE ICE MACHINE WITH SINGLE CIRCUIT MODEL CONDENSER 208-230/3/60 OR 380-415/3/50 ! Warning These diagrams are not intended to show proper wire routing, wire sizing, disconnects, etc., only the correct wire connections. SINGLE CIRCUIT REMOTE CONDENSER L1 All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes.
Installation Instructions Section 2 Water Supply and Drain Requirements DRAIN CONNECTIONS WATER SUPPLY Follow these guidelines when installing drain lines to prevent drain water from flowing back into the ice machine and storage bin: Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste.
Section 2 Installation Instructions WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS ! Caution Plumbing must conform to state and local codes. Location Water Temperature Water Pressure Ice Machine Fitting Ice Making Water Inlet 35°F (1.6°C) Min. 90°F (32.2°C) Max. 20 psi (137.9 kPA) Min. 80 psi (551.5 kPA) Max. 3/8" Female Pipe Thread Tubing Size Up to Ice Machine Fitting 3/8" (.95 cm) minimum inside diameter Ice Making Water Drain --- --- 1/2" Female Pipe Thread 1/2" (1.
Installation Instructions Section 2 Remote Condenser/Line Set Installation Ice Machine S500 S600/S800/S1000 Remote Single Circuit Condenser JC0495 JC0895 S1400/S1800 JC1395 *Line Set RT RL Discharge Line 1/2" (1.27 cm) 1/2" (1.27 cm) Line Set* RT-20-R404A RT-35-R404A RT-50-R404A RT-20-R404A RT-35-R404A RT-50-R404A RL-20-R404A RL-35-R404A RL-50-R404A IMPORTANT EPA CERTIFIED TECHNICIANS If remote line set length is between 50' and 100' (15.2530.5 m), add 1.5 lb. (24 oz) (0.
Section 2 Installation Instructions GENERAL GUIDELINES FOR ROUTING LINE SETS Condensers must be mounted horizontally with the fan motor on top. First, cut a 2.5" (6.35 cm) circular hole in the wall or roof for tubing routing. The line set end with the 90° bend will connect to the ice machine. The straight end will connect to the remote condenser. Remote condenser installations consist of vertical and horizontal line sets between the ice machine and the condenser.
Installation Instructions Section 2 Make the following calculations to make sure the line set layout is within specifications. CALCULATING REMOTE CONDENSER INSTALLATION DISTANCES Line Set Length 1. Insert the measured rise into the formula below. Multiply by 1.7 to get the calculated rise. (Example: A condenser located 10 feet above the ice machine has a calculated rise of 17 feet.) The maximum length is 100' (30.5 m). The ice machine compressor must have the proper oil return.
Section 2 Installation Instructions LENGTHENING OR REDUCING LINE SET LENGTHS REMOTE RECEIVER SERVICE VALVE In most cases, by routing the line set properly, shortening will not be necessary. When shortening or lengthening is required, do so before connecting the line set to the ice machine or the remote condenser. This prevents the loss of refrigerant in the ice machine or condenser. The receiver service valve is closed during shipment. Open the valve prior to starting the ice machine.
Installation Instructions Section 2 Remote Ice Machine Usage with Non-Manitowoc Multi-Circuit Condensers WARRANTY FAN MOTOR The sixty (60) month compressor warranty, including thirty six (36) month labor replacement warranty, shall not apply when the remote ice machine is not installed within the remote specifications. The foregoing warranty shall not apply to any ice machine installed and/or maintained inconsistent with the technical instructions provided by Manitowoc Ice, Inc.
Section 2 Installation Instructions NON-MANITOWOC MULTI-CIRCUIT CONDENSER SIZING CHART Ice Machine Model Refrigerant Type Charge Heat of Rejection Average Btu/hr Peak Btu/hr Internal Condenser Volume (cu ft) Min Design Pressure Max S500 R-404A 6 lbs. 7,000 9,600 0.020 0.035 S600 R404A 6.5 lbs. 9,000 13,900 0.045 0.060 S850 R-404A 8.5 lbs. 12,000 18,000 0.045 0.060 S1000 S1400 R-404A R-404A 8.5 lbs. 11 lbs. 16,000 19,000 22,000 28,000 0.045 0.085 0.060 0.
Installation Instructions Section 2 Installation Check List F F F F F F F F F Is the Ice Machine level? Has all of the internal packing been removed? Have all of the electrical and water connections been made? F F F Has the supply voltage been tested and checked against the rating on the nameplate? F Is there proper clearance around the ice machine for air circulation? F Has the ice machine been installed where ambient temperatures will remain in the range of 35° - 110°F (1.6° - 43.
Section 2 Installation Instructions Before Starting the Ice Machine AuCS® Automatic Cleaning System All Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do not require any adjustment. This optional accessory monitors ice making cycles and initiates cleaning procedures automatically. The AuCS® accessory can be set to automatically clean or sanitize the ice machine every 2, 4 or 12 weeks.
Installation Instructions Section 2 THIS PAGE INTENTIONALLY LEFT BLANK 2-22 Part Number 80-1480-3
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 Pump Water Inlet Location Water Inlet Valve (Located in Refrigeration Compartment) sv3150 Part Number 80-1480-3 3-1
Ice Machine Operation Section 3 Sequence Of Operation NOTE: The toggle switch must be in the ice position and the water curtain must be in place on the evaporator before the ice machine will start. INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 1. Water Purge Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds, to completely purge the ice machine of old water. This feature ensures that the ice making cycle starts with fresh water.
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. The water pump continues to run, and the water dump valve energizes for 45 seconds to purge the water in the sump trough. The water fill valve energizes (turns on) and de-energizes (turns off) strictly by time.
Ice Machine Operation Section 3 Operational Checks ICE THICKNESS CHECK GENERAL The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (.32 cm). Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do not require any adjustment.
Section 3 Ice Machine Operation HARVEST SEQUENCE WATER PURGE The harvest sequence water purge adjustment may be used when the ice machine is hooked up to special water systems, such as a de-ionized water treatment system. ! Warning • During the harvest sequence water purge, the water fill valve energizes and de-energizes by time. The water purge must be at the factory setting of 45 seconds for the water fill valve to energize during the last 15 seconds of the water purge.
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Section 4 Maintenance Section 4 Maintenance General Cleaning the Condenser You are responsible for maintaining the ice machine in accordance with the instructions in this manual. Maintenance procedures are not covered by the warranty. GENERAL ! Warning If you do not understand the procedures or the safety precautions that must be followed, call your local Manitowoc service representative to perform the maintenance procedures for you.
Maintenance Section 4 4. Straighten any bent condenser fins with a fin comb. “COMB” DOWN ONLY Water-Cooled Condenser and Water Regulating Valve Symptoms of restrictions in the condenser water circuit include: • Low ice production • High water consumption • High operating temperatures • High operating pressures CONDENSER If the ice machine is experiencing any of these symptoms, the water-cooled condenser and water regulating valve may require cleaning due to scale build-up.
Section 4 Maintenance Guardianf Slime is a leading cause of ice machine breakdowns and biological growth is a health concern. The Guardianf system releases chlorine dioxide on a controlled basis to inhibit the growth of bacteria and fungi that form slime and cause malodors in the food zone of ice machines. The Guardianf will not control mineral or other water borne buildup. Your water quality will determine the length of time before mineral buildup affects ice machine performance.
Maintenance Section 4 Interior Cleaning and Sanitizing ! Caution GENERAL Clean and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent cleaning and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment. An extremely dirty ice machine must be taken apart for cleaning and sanitizing.
Section 4 Maintenance SANITIZING PROCEDURE Use sanitizer to remove algae or slime. Do not use it to remove lime scale or other mineral deposits. 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 4 Use the sanitizing solution and a sponge or cloth to sanitize (wipe) all parts and interior surfaces of the ice machine. Sanitize the following areas: A.
Maintenance Section 4 REMOVAL OF PARTS FOR CLEANING/SANITIZING 1. Turn off the electrical and water supply to the ice machine (and dispenser when applicable). 5. Use a soft-bristle brush or sponge (NOT a wire brush) to carefully clean the parts. ! Caution ! Warning Disconnect electric power to the ice machine (and dispenser if applicable) at the electric switch box before proceeding. ! Caution 2. Remove all ice from the bin. 3. Remove the water curtain and the components you want to clean or sanitize.
Section 4 Maintenance 2. Ice Thickness Probe 1. Water Curtain A. Gently flex the curtain in the center and remove it from the right side. A. Compress the hinge pin on the top of the ice thickness probe. B. Slide the left pin out. STEP 1 STEP 2 COMPRESS HINGE PIN TO REMOVE SV3153 SV3135 Water Curtain Removal Ice Thickness Probe Removal B. 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.
Maintenance Section 4 3. Water Distribution Tube ! Warning Removing the distribution tube while the water pump is running will allow water to spray from ice machine. Disconnect the electrical power to the ice machine and dispenser at the electric service switch box and turn off the water supply. 4. Water Trough A. Depress tabs on right and left side of the water trough. B. Allow front of water trough to drop as you pull forward to disengage the rear pins.
Section 4 Maintenance Water Pump Water Level Probe 1. Remove the water trough. ! Warning ! Warning Disconnect the electrical power to the ice machine at the electrical disconnect before proceeding. 2. The water level probe normally does not require removal for cleaning. The probe can be wiped and cleaned in place or proceed to step 3. 3. Pull the water level probe straight down to disengage.
Maintenance Section 4 Water Dump Valve The water dump valve normally does not require removal for cleaning. To determine if removal is necessary: 1. Locate the water dump valve. 2. Set the toggle switch to ICE. 3. While the ice machine is in the freeze mode, check the dump valve’s clear plastic outlet drain hose for leakage. Important The plunger and the inside of the enclosing tube must be completely dry before assembly.
Section 4 Evaporator Tray Removal 1. Remove the water trough. 2. Remove thumbscrew on left side of tray. Maintenance Drain Line Check Valve The drain line check valve normally does not require removal for cleaning. Water loss from the sump trough will indicate removal and cleaning are required. 3. Allow left side of tray to drop as you pull the tray to the left side. Continue until the outlet tube disengages from the right side. sv3154 1. Remove check valve and tube assembly. A.
Maintenance Section 4 Water Inlet Valve Removing the Front Panels 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. NOTE: The front panels do not normally have to be removed. If needed perform the following procedure. 1. When the ice machine is off, the water inlet valve must completely stop water flow into the machine. 2.
Section 4 Maintenance 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 WATER-COOLED ICE MACHINES 1. Perform steps 1-6 under “Self-Contained Air-Cooled Ice Machines.” 2. Disconnect the incoming water and drain lines from the water-cooled condenser. 3.
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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 Ice machine does not operate. Ice machine stops, and can be restarted by moving the toggle switch to OFF and back to ICE. Ice machine does not release ice or is slow to harvest. Ice machine does not cycle into harvest mode.
Before Calling For Service Problem Ice machine produces shallow or incomplete cubes, or the ice fill pattern on the evaporator is incomplete. Low ice capacity. Section 5 Possible Cause Ice thickness probe is out of adjustment. To Correct Adjust the ice thickness probe. (See Section 4) Water trough level is too low. Check the water level probe for damage. (See Section 3) Water inlet valve filter screen is dirty. Remove the water inlet valve and clean the filter screen.
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Before Calling For Service Section 5 THIS PAGE INTENTIONALLY LEFT BLANK 5-4 Part Number 80-1480-3
Section 6 Electrical System Section 6 Electrical System Energized Parts Charts SELF-CONTAINED AIR- AND WATER-COOLED MODELS Control Board Relays Ice Making Sequence Of Operation START-UP 1 1. Water Purge 2. Refrigeration System Start-Up FREEZE SEQUENCE 3. Pre-Chill 4. Freeze 1 2 3 Water Pump Harvest Valve (Left) Harvest Valve (Right)* On On (when used) On Off Off On On Off Off Off Off 5 Air Comp.* Water Inlet Valve Dump Valve Off On Off Off Off Off On On On 6.
Electrical System Section 6 REMOTE MODELS Control Board Relays Ice Making Sequence Of Operation 2 3 4 5 6 7 Water Pump Harvest Valve (Left) HPR Valve Harvest Valve (Right)* Air Comp.* Water Inlet Valve Dump Valve Off On START-UP 1 1. Water Purge On On On 35 sec. Off 10 sec. On 2. Refrigeration System Start-Up Off On On Off FREEZE SEQUENCE 3. Pre-Chill 4. Freeze Contactor 1 Off On Off Off Off Off Off Off May Cycle On/Off during first 45 sec.
Section 6 Wiring Diagram Sequence of Operation Electrical System L2 or N L1 Ground SELF-CONTAINED MODELS Initial Start-Up or Start-Up After Automatic Shut-Off (89) (20) (55) (61) High Pressure Cutout (88) The harvest valve(s) is also energized during the water purge. In the case of an initial refrigeration start-up or auto shut-off, it stays on for an additional 5 seconds (50 seconds total). (42) (99) (22) Control Board (2) (6) (5) (1) (7) (4) 1.
Electrical System 2. REFRIGERATION SYSTEM START-UP The compressor starts after the 45second water purge, and it remains on throughout the Freeze and Harvest cycles. Section 6 L2 or N L1 Ground (89) (20) (55) (61) High Pressure Cutout (88) (42) Harvest Valve (77) (80) Dump Valve (76) (81) (60) (75) Water Pump (57) (98) Trans. The harvest valve(s) remains on for the first 5 seconds of the initial compressor start-up and then shuts off.
Section 6 Electrical System Freeze Sequence L2 or N L1 3. PRE-CHILL Ground To pre-chill the evaporator, the compressor runs for 30 seconds (60 seconds initial cycle) prior to water flow. (89) Water Valve (21) (22) (20) (55) (61) High Pressure Cutout (88) Control Board (2) (6) (5) (1) (7) (4) The water fill valve remains on until the water level probe is satisfied. (42) (99) Harvest Valve (77) (80) Dump Valve (76) (81) (60) (75) Water Pump (57) (98) Trans.
Electrical System 4. FREEZE The water pump starts after the prechill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. Section 6 L2 or N L1 Ground (89) (20) (55) (61) High Pressure Cutout (88) Control Board (2) (6) (5) (1) (7) (4) The water fill valve will cycle off then on one more time to refill the water trough. (42) When sufficient ice has formed, the water flow (not the ice) contacts the ice thickness probes.
Section 6 Electrical System Harvest Sequence L2 or N L1 5. WATER PURGE Ground The harvest valve(s) opens at the beginning of the water purge to divert hot refrigerant gas into the evaporator. (89) The water pump continues to run, and the water dump valve energizes for 45 seconds to purge the water in the sump trough. The water fill valve energizes and de-energizes strictly by time. The water fill valve energizes for the last 15 seconds of the 45second water purge.
Electrical System 6. HARVEST The harvest valve(s) remains open and the refrigerant gas warms the evaporator. This causes the cubes to slide, as a sheet, off the evaporator and into the storage bin. The sliding sheet of cubes swings the water curtain out, opening the bin switch. This momentary opening and closing of the bin switch terminates the Harvest Cycle and returns the ice machine to the Freeze Cycle (steps 3-4).
Section 6 Electrical System Automatic Shut-Off 7. AUTOMATIC SHUT-OFF L2 or N L1 Ground When the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the water curtain and holds it open. After the water curtain is held open for 30 seconds, the ice machine shuts off. (89) (20) (55) (61) High Pressure Cutout (88) The ice machine remains off until enough ice is removed from the storage bin to allow the sheet of cubes to drop clear of the water curtain.
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Section 6 Electrical System REMOTE MODELS Water Valve Initial Start-Up Or Start-Up After Automatic Shut-Off (22) Ground (89) 1. WATER PURGE Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds to purge old water from the ice machine. This ensures that the ice-making cycle starts with fresh water.
Electrical System Section 6 2. REFRIGERATION SYSTEM START-UP The compressor, remote condenser fan motor and liquid line solenoid valve energize after the 45-second water purge, and remain on throughout the Freeze and Harvest cycles. The water fill valve is energized at the same time as the compressor. It remains on until the water level sensor closes for 3 continuous seconds.
Section 6 Electrical System Freeze Sequence 3. PRE-CHILL To pre-chill the evaporator, the compressor runs for 30 seconds (60 seconds initial cycle) prior to water flow. Water Valve (21) (20) (L1) (22) Ground (89) (88) (L2) (82) HPR Valve (78) (55) (61) (79) (77) Control Board High Pressure Cut-out (2) (6) (5) (1) NOTE: The water fill valve remains on until the water level probe is satisfied.
Electrical System Section 6 4. FREEZE The water pump starts after the prechill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. The water fill valve will cycle off then on one more time to refill the water trough. When sufficient ice has formed, the water flow (not the ice) contacts the ice thickness probes. After approximately 10 seconds of continual contact, a harvest cycle is initiated.
Section 6 Electrical System Harvest Sequence 5. WATER PURGE The harvest valve and HPR solenoid also 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 for 45 seconds to purge the water in the sump trough. The water fill valve energizes (turns on) and deenergizes (turns off) strictly by time. The water fill valve energizes for the last 15 seconds of the 45-second water purge.
Electrical System Section 6 6. HARVEST The harvest valve(s) and HPR solenoid valve remain open, allowing refrigerant gas to warm the evaporator. This causes the cubes to slide, as a sheet, off the evaporator and into the storage bin. The sliding sheet of cubes swings the water curtain out, opening the bin switch. This momentary opening and closing of the bin switch terminates the Harvest Cycle and returns the ice machine to the Freeze Cycle (steps 3-4).
Section 6 Electrical System Automatic Shut-Off 7. AUTOMATIC SHUT-OFF Water Valve (20) (L1) If the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the water curtain and holds it open. After the water curtain is held open for 30 seconds, the ice machine shuts off. The ice machine remains off until enough ice is removed from the storage bin to allow the sheet of cubes to drop clear of the water curtain.
Electrical System Section 6 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.
Section 6 Electrical System S320 SELF CONTAINED- 1 PHASE SEE SERIAL PLATE FOR VOLTAGE L2 OR N L1 (21) (20) GROUND WATER VALVE (61) (22) CONTROL BOARD (55) (89) (2) (60) (6) HIGH PRESSURE CUTOUT HARVEST SOLENOID (5) (80) (75) (76) (1) (88) (99) (77) DUMP SOLENOID (7) (57) (4) (81) (98) TRANS. WATER PUMP FUSE (7A) CLEAN LEFT BIN RIGHT BIN RMT BIN WTR PROBE ICE PROBE HARV SL-1 SL-2 (42) ICE THICKNESS PROBE (58) (59) CONTACTOR COIL (56) (9) (8) (6) LOW D.C.
Electrical System Section 6 S300/S420/S450- SELF CONTAINED - 1 PHASE Water Valve L1 (20) Ground (21) (61) (22) Control Board (89) (55) Harvest Valve (77) (2) (60) (6) (88) (80) (5) High Pressure Cutout Dump Valve (75) (76) (1) (7) (81) (4) (57) (98) Water Pump (99) Trans.
Section 6 Electrical System S500/S600/S850/S1000/S1200 - SELF CONTAINED - 1 PHASE L1 L2 or N Ground (99) Water Valve (20) (89) (21) (55) (22) (61) (88) Control Board (2) High Pressure Cutout Harvest Valve (77) (60) (6) (80) (5) Dump Valve (76) (1) (7) (75) (81) Water Pump (4) (98) (57) (99) Trans.
Electrical System Section 6 S850/S1000/S1200 - SELF CONTAINED - 3 PHASE L3 L2 (99) Water Valve L1 Ground (20) (21) (61) (89) (22) Control Board (55) Harvest Valve (2 High Pressure Cutout (77) (80) (60) (6) (88) (5) Dump Valve (76) (1) (7) (81) (4) Water Pump (57) (98) (99) Trans.
Section 6 Electrical System S500/S600/S850/S1000 - REMOTE - 1 PHASE Water Valve L1 (22) (21) (20) L2 or N Ground HPR Valve (89) (78) (55) (79) (61) (88) Harvest Valve Control Board (2) High Pressure Cutout (82) (77) (80) (60) (6) Dump Valve (76) (5) (81) (1) (7) Water Pump (4) (98) (57) (99) Trans.
Electrical System Section 6 S850/S1000 - REMOTE - 3 PHASE Water Valve L3 L2 (22) (21) (20) L1 Ground HPR Valve (89) (55) (78) (61) (77) (80) (2) (6) (88) (79) Harvest Valve Control Board High Pressure Cutout (82) (60) Dump Valve (76) (5) (81) (1) (7) Water Pump (98) (57) (4) (99) (82) Liquid Solenoid (83) Trans.
Section 6 Electrical System S1400/S1600/S1800 - SELF-CONTAINED - 1 PHASE WATER VALVE L1 L2 OR N (21) (20) (22) (89) (55) LH HARVEST (77) SOLENOID (61) (87) CONTROL BOARD HIGH PRESSURE CUTOUT (88) (2) (6) (88) (99) RH HARVEST SOLENOID (60) (80) (5) (76) (1) (57) (4) (81) DUMP SOLENOID (7) (98) WATER PUMP TRANS.
Electrical System Section 6 S1400/S1600/S1800 - SELF-CONTAINED - 3 PHASE WATER VALVE (21) (20) (22) L3 L1 L2 LH HARVEST SOLENOID (77) (61) (87) (55) (89) (99) (88) CONTROL BOARD (2) HIGH PRESSURE CUTOUT (6) RH HARVEST SOLENOID (60) (80) (5) (88) (76) (1) DUMP SOLENOID (7) (57) (4) (81) (98) WATER PUMP TRANS.
Section 6 Electrical System S1400/S1600/S1800 - REMOTE - 1 PHASE WATER VALVE (21) (20) L1 (22) HPR SOLENOID (55) (89) (82) (78) HIGH PRESSURE CUTOUT CONTROL BOARD (88) (2) (79) RH HARVEST SOLENOID (88) (61) L2 OR N (87) (77) (60) (6) (5) LH HARVEST SOLENOID (80) (76) (1) (7) DUMP SOLENOID (57) (4) (81) (99) (98) WATER PUMP TRANS.
Electrical System Section 6 S1400/S1600/S1800 - REMOTE - 3 PHASE WATER VALVE (21) (20) L1 L2 L3 HPR SOLENOID (78) (89) (55) RH HARVEST SOLENOID (88) HIGH PRESSURE CUTOUT (22) (82) (79) (87) (61) (88) (77) CONTROL BOARD (2) (60) (6) (80) LH HARVEST SOLENOID (5) (76) (1) DUMP SOLENOID (7) (81) (99) (98) (57) (4) WATER PUMP TRANS.
Section 6 Electrical System Component Specifications and Diagnostics MAIN FUSE BIN SWITCH Function Function The control board fuse stops ice machine operation if electrical components fail causing high amp draw. Movement of the water curtain controls bin switch operation. The bin switch has two main functions: 1. Terminating the harvest cycle and returning the ice machine to the freeze cycle. Specifications The main fuse is 250 Volt, 7 amp.
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 curtain can be removed and installed at any time without interfering with the electrical control sequence. • 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.
Section 6 Electrical System COMPRESSOR ELECTRICAL DIAGNOSTICS Determine if the Compressor is Seized The compressor will not start or will trip repeatedly on overload. Check the amp draw while the compressor is trying to start. Check Resistance (Ohm) Values COMPRESSOR DRAWING LOCKED ROTOR NOTE: Compressor windings can have very low ohm values. Use a properly calibrated meter. The two likely causes of this are: Perform the resistance test after the compressor cools.
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. The PTCR is wired across the run capacitor (in series with the start winding). A PTCR (or Positive Temperature Coefficient Resistor) is made from high-purity, semi-conducting ceramics. A PTCR is useful because of its resistance versus temperature characteristic.
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, the sheet of cubes fails to clear the water curtain and will hold it open. After the water curtain is held open for 30 seconds, the ice machine shuts off. To assure the PTCR has cooled, the ice machine remains off for 3 minutes before it can automatically restart.
Electrical System Section 6 There are other problems that may cause compressor start-up failure with a good PTCR in a new, properly wired ice machine. • 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.
Section 6 Electrical System DIAGNOSING START COMPONENTS HARVEST ASSIST AIR COMPRESSOR If the compressor attempts to start, or hums and trips the overload protector, check the start components before replacing the compressor. Function 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. A good test is to install a known good substitute capacitor.
Electrical System Section 6 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, single-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 volt meter be used to check toggle switch operation. 1. Inspect the toggle switch for correct wiring. 2.
Section 6 Electrical System 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 ADJUSTMENT CLEAN LIGHT (YELLOW) LEFT BIN LIGHT (GREEN) RIGHT BIN LIGHT (GREEN) REMOTE BIN LIGHT (GREEN) WATER PROBE LIGHT (GREEN) ICE PROBE LIGHT (GREEN) HARVEST LIGHT (RED) SAFETY LIMIT 1 LIGHT (RED) SAFETY LIMIT 2 LIGHT (RED) ICE THICKNESS PROBE (3/16'' CONNECTION) AUTOMATIC CLEANIN
Electrical System Section 6 General Inputs S-Model control boards use a dual voltage transformer. This means only one control board is needed for both 115V and 208-230V use. The control board, along with inputs, controls all electrical components, including the ice machine sequence of operation. Prior to diagnosing, you must understand how the inputs affect the control board operation.
Section 6 Electrical System Ice Thickness Probe (Harvest Initiation) ICE THICKNESS CHECK HOW THE PROBE WORKS The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (.32 cm). 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.
Electrical System Section 6 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).
Section 6 Electrical System Water Level Control Circuitry FREEZE CYCLE CIRCUITRY WATER LEVEL PROBE LIGHT 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 (turns on) and de-energizes (turns off) in conjunction with the water level probe located in the water trough. The water level probe circuit can be monitored by watching the water level light.
Electrical System Section 6 DIAGNOSING WATER LEVEL CONTROL CIRCUITRY Problem: Water Trough Overfilling During The Freeze Cycle Step 2 Wait until the freeze cycle starts (the freeze cycle starts when the water pump energizes). Step 1 Start a new freeze sequence by moving the ICE/ OFF/CLEAN toggle switch to OFF, then back to ICE. (if water flows with the switch off, check the water inlet valve).
Section 6 Electrical System Problem: Water Will Not Run Into The Sump Trough During The Freeze Cycle Step 1 Verify water is supplied to the ice machine, and then start a new freeze sequence by moving the ICE/ OFF/CLEAN toggle switch to OFF then back to ICE. Step 2 Wait until the freeze cycle starts (approximately 45 seconds, the freeze cycle starts when the compressor energizes). Step 3 Disconnect the water level probe from the water level probe terminal on the control board.
Electrical System Section 6 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. Step 1 2 3 4 5 6 7 6-44 Check Verify primary voltage supply to ice machine. Verify the high-pressure cutout is closed. Verify control board fuse is OK. Verify the bin switch functions properly.
Section 6 Electrical System S1000 - SELF CONTAINED 1 PHASE WITH TERMINAL BOARD 1 2 3 4 6 5 SV2071 Part Number 80-1480-3 6-45
Electrical System Section 6 THIS PAGE INTENTIONALLY LEFT BLANK 6-46 Part Number 80-1480-3
Section 7 Refrigeration System Section 7 Refrigeration System Sequence of Operation SELF-CONTAINED AIR OR WATER -COOLED MODELS EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE X COMPRESSOR STRAINER AIR OR WATER CONDENSER DRIER RECEIVER (WATER COOLED ONLY) HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1569 Figure 7-1.
Refrigeration System Section 7 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR STRAINER AIR OR WATER CONDENSER DRIER RECEIVER (WATER COOLED ONLY) HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1570 Figure 7-2. Self-Contained Harvest Cycle Harvest Cycle Refrigeration Sequence Hot gas flows through the energized harvest valve, heating the evaporator.
Section 7 Refrigeration System REMOTE MODELS EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER X COMPRESSOR HOT GAS SOLENOID VALVE REMOTE CONDENSER CHECK VALVE LIQUID LINE SOLENOID VALVE HARVEST PRESSURE REGULATING VALVE HEAD PRESSURE CONTROL VALVE X DRIER H.P.R. SOLENOID VALVE R CHECK VALVE B C RECEIVER SERVICE VALVE RECEIVER HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1566 Figure 7-3.
Refrigeration System Section 7 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER COMPRESSOR HOT GAS SOLENOID VALVE REMOTE CONDENSER CHECK VALVE LIQUID LINE SOLENOID VALVE DRIER RECEIVER SERVICE VALVE HEAD PRESSURE CONTROL VALVE HARVEST PRESSURE REGULATING VALVE B H.P.R. SOLENOID VALVE R CHECK VALVE C RECEIVER HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1567 Figure 7-4.
Section 7 Refrigeration System EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER X COMPRESSOR HOT GAS SOLENOID VALVE REMOTE CONDENSER CHECK VALVE X LIQUID LINE SOLENOID VALVE HEAD PRESSURE CONTROL VALVE HARVEST PRESSURE REGULATING VALVE DRIER X RECEIVER SERVICE VALVE H.P.R. SOLENOID VALVE B R CHECK VALVE C RECEIVER LIQUID/VAPOR EQUALIZED TO AMBIENT CONDITIONS SV1568 Figure 7-5.
Refrigeration System Section 7 S1400/S1600/S1800 SELF-CONTAINED TUBING SCHEMATIC HEAT EXCHANGER EXPANSION VALVE EXPANSION VALVE HARVEST SOLENOID VALVE COMPRESSOR x x EVAPORATOR HARVEST SOLENOID VALVE STRAINER DRIER RECEIVER AIR OR WATER COOLED CONDENSER NOTE: The refrigeration sequence for self-contained dual expansion valve ice machines is identical to selfcontained single expansion valve ice machines. See Pages 7-1 and 7-2 for sequence of operation.
Section 7 Refrigeration System S1400/S1600/S1800 REMOTE TUBING SCHEMATIC HEAT EXCHANGER EXPANSION VALVE EXPANSION VALVE LLSV x x EVAPORATOR HARVEST SOLENOID VALVE HARVEST SOLENOID VALVE COMPRESSOR STRAINER DRIER CHECK VALVE x HPR VALVE CHECK VALVE HEAD PRESSURE CONTROL VALVE REMOTE CONDENSER RECEIVER NOTE: The refrigeration sequence for remote dual expansion valve ice machines is identical to remote single expansion valve ice machines. See Pages 7-3, 7-4, and 7-5 for sequence of operation.
Refrigeration System Operational Analysis (Diagnostics) GENERAL When analyzing the refrigeration system, it is important to understand that different refrigeration component malfunctions may cause very similar symptoms. Also, many external factors can make good refrigeration components appear bad. These factors can include improper installation, or water system malfunctions such as hot incoming water supply or water loss.
Section 7 BEFORE BEGINNING SERVICE Ice machines may experience operational problems only during certain times of the day or night. A machine may function properly while it is being serviced, but malfunctions later. Information provided by the user can help the technician start in the right direction, and may be a determining factor in the final diagnosis. Refrigeration System 2. Refer to the appropriate 24 Hour Ice Production Chart.
Refrigeration System Section 7 INSTALLATION/VISUAL INSPECTION CHECKLIST Possible Problem Ice machine is not level Condenser is dirty Water filtration is plugged (if used) Water drains are not run separately and/or are not vented Line set is improperly installed 7-10 Corrective Action Level the ice machine Clean the condenser Install a new water filter Run and vent drains according to the Installation Manual Reinstall according to the Installation Manual WATER SYSTEM CHECKLIST A water-related problem of
Section 7 Refrigeration System ICE FORMATION PATTERN 2. Extremely Thin at Evaporator Outlet Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. There is no ice, or a considerable lack of ice formation at the outlet of the evaporator. Analyzing the ice formation pattern alone cannot diagnose an ice machine malfunction. However, when this analysis is used along with Manitowoc’s Refrigeration System Operational Analysis Table, it can help diagnose an ice machine malfunction.
Refrigeration System Section 7 3. Extremely Thin at Evaporator Inlet 5. No Ice Formation There is no ice, or a considerable lack of ice formation at the inlet of the evaporator. Examples: The ice at the outlet of the evaporator reaches 1/8" to initiate a harvest, but there is no ice formation at all at the inlet of the evaporator. The ice machine operates for an extended period, but there is no ice formation at all on the evaporator.
Section 7 SAFETY LIMITS General In addition to standard safety controls, such as high pressure cut-out, the control board has two built in safety limit controls which protect the ice machine from major component failures. Safety Limit #1: If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle. If 6 consecutive 60-minute freeze cycles occur, the ice machine stops. Safety Limit #2: If the harvest time reaches 3.
Refrigeration System Section 7 Safety Limit #1 Refer to previous page for safety limit operation. Freeze time exceeds 60 minutes for 6 consecutive freeze cycles. Possible Cause Improper installation Water system Electrical system Miscellaneous Refrigeration system SAFETY LIMIT NOTES • Because there are many possible external problems, do not limit your diagnosis to only the items listed in this chart. • A continuous run of 100 harvests automatically erases the safety limit code.
Section 7 Refrigeration System 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 Improper installation Water system Electrical system Refrigeration system SAFETY LIMIT NOTES • Because there are many possible external problems, do not limit your diagnosis to only the items listed in this chart. • A continuous run of 100 harvests automatically erases the safety limit code.
Refrigeration System Section 7 3. Perform an actual discharge pressure check. ANALYZING DISCHARGE PRESSURE DURING FREEZE OR HARVEST CYCLE Procedure 1. Determine the ice machine operating conditions: Air temp. entering condenser Air temp. around ice machine Water temp. entering sump trough ______ ______ ______ 2. Refer to Operating Pressure Chart for ice machine being checked. Use the operating conditions determined in step 1 to find the published normal discharge pressures.
Section 7 Refrigeration System NOTE: Analyze discharge pressure before analyzing suction pressure. High or low discharge pressure may be causing high or low suction pressure. ANALYZING SUCTION PRESSURE DURING FREEZE CYCLE 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. This affects freeze cycle times.
Refrigeration System Section 7 Freeze Cycle Suction Pressure High Checklist Possible Cause Improper installation Discharge pressure Improper refrigerant charge Other Check/Correct See “Installation/Visual Inspection Checklist” Discharge pressure is too high, and is affecting low side (See “Freeze Cycle Discharge Pressure High Checklist” ) Overcharged Wrong type of refrigerant Non-Manitowoc components in system H.P.R.
Section 7 SINGLE EXPANSION VALVE ICE MACHINES COMPARING EVAPORATOR INLET AND OUTLET TEMPERATURES NOTE: This procedure will not work on the dual expansion valve ice machines. The temperatures of the suction lines entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle, along with using Manitowoc’s Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.
Refrigeration System HARVEST VALVE TEMPERATURE CHECK Section 7 3. Feel the compressor discharge line. General NOTE: This procedure requires checking both harvest valves on dual expansion valve S1400 and S1800 ice machines. A harvest valve requires a critical orifice size. This meters the amount of hot gas flowing into the evaporator during the harvest cycle. If the orifice is even slightly too large or too small, long harvest cycles will result.
Section 7 Refrigeration System 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 diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle.
Refrigeration System HOW TO USE THE REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES General These tables must be used with charts, checklists and other references to eliminate refrigeration components not listed on the tables and external items and problems which can cause good refrigeration components to appear defective. The tables list five different defects that may affect the ice machine’s operation.
Section 7 Refrigeration System 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.
Refrigeration System Section 7 REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES S Models Dual 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.
Section 7 Refrigeration System HARVEST PRESSURE REGULATING (H.P.R.) SYSTEM FREEZE CYCLE The H.P.R. system is not used during the freeze cycle. The H.P.R. solenoid is closed (de-energized), preventing refrigerant flow into the H.P.R. valve. Remotes Only GENERAL HARVEST CYCLE The harvest pressure regulating (H.P.R.) system includes: • Harvest pressure regulating solenoid valve (H.P.R. solenoid). This is an electrically operated valve which opens when energized, and closes when deenergized.
Refrigeration System HPR DIAGNOSTICS Steps 1 through 4 can be quickly verified without attaching a manifold gauge set or thermometer. All questions must have a yes answer to continue the diagnostic procedure. 1. Liquid line warm? (Body temperature is normal) If liquid line is warmer or cooler than body temperature, refer to headmaster diagnostics. 2. Ice fill pattern normal? Refer to “Ice Formation Pattern” if ice fill is not normal. Section 7 5.
Section 7 Refrigeration System Diagnosing HEADMASTER CONTROL VALVE Manitowoc remote systems require headmaster control valves with special settings. Replace defective headmaster control valves only with “original” Manitowoc replacement parts. Operation The R404A headmaster control valve is non adjustable. At ambient temperatures of approximately 70°F (21.1°C) or above, refrigerant flows through the valve from the condenser to the receiver inlet.
Refrigeration System Section 7 FAN CYCLE CONTROL VS. HEADMASTER A fan cycle control cannot be used in place of a headmaster. The fan cycle control is not capable of bypassing the condenser coil and keeping the liquid line temperature and pressure up. This is very apparent when it rains or the outside temperature drops. When it rains or the outside temperature drops, the fan begins to cycle on and off. At first, everything appears normal.
Section 7 Refrigeration System Pressure Control Specifications and Diagnostics FAN CYCLE CONTROL (Self-Contained Air-Cooled Models Only) Function Cycles the fan motor on and off to maintain proper operating discharge pressure. The fan cycle control closes on an increase, and opens on a decrease in discharge pressure. HIGH PRESSURE CUT-OUT (HPCO) CONTROL Function Stops the ice machine if subjected to excessive highside pressure.
Refrigeration System Section 7 Cycle Time/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. • Refer to “OPERATIONAL ANALYSIS TABLE” for the list of data that must be collected for refrigeration diagnostics.
Section 7 Refrigeration System S300 SERIES S300 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Refrigeration System Section 7 S320 SERIES S320 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Section 7 Refrigeration System S420 SERIES S420 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 9.4-10.
Refrigeration System Section 7 S450 SERIES S450 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 9.4-10.
Section 7 Refrigeration System S500 SERIES S500 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Refrigeration System Section 7 S500 SERIES S600 SERIES Remote Self-Contained Air-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Section 7 Refrigeration System S600 SERIES S600 SERIES Self-Contained Water-Cooled Remote NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Around Ice Machine °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 7.6-9.0 7.8-9.2 7.
Refrigeration System Section 7 S850 SERIES S850 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Section 7 Refrigeration System S850 SERIES S1000 SERIES Remote Self-Contained Air-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Refrigeration System Section 7 S1000 SERIES S1000 SERIES Self-Contained Water-Cooled Remote NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Around Ice Machine °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 6.8-7.9 6.9-8.
Section 7 Refrigeration System S1200 SERIES S1200 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Refrigeration System Section 7 S1400 SERIES S1400 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Section 7 Refrigeration System S1400 SERIES S1600 SERIES Remote Self-Contained Air-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 9.
Refrigeration System Section 7 S1600 SERIES S1600 SERIES Self-Contained Water-Cooled Remote NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Around Ice Machine °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 9.8-10.8 10.
Section 7 Refrigeration System S1800 SERIES S1800 SERIES Self-Contained Air-Cooled Self-Contained Water-Cooled NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.
Refrigeration System Section 7 S1800 SERIES Remote NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Entering Condenser °F/°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°C 50/10.0 70/21.1 90/32.2 8.9-9.8 10.0-11.0 10.7-11.7 9.0-9.9 9.2-10.1 9.6-10.5 10.4-11.5 10.1-11.1 10.1-11.1 10.0-11.0 11.5-12.6 10.8-11.9 10.8-11.9 11.6-12.7 12.5-13.7 Harvest Time 1-2.
Section 7 Refrigeration System Refrigerant Recovery/Evacuation and Recharging NORMAL SELF-CONTAINED MODEL PROCEDURES SELF-CONTAINED RECOVERY/EVACUATION Refrigerant Recovery/Evacuation 1. Place the toggle switch in the OFF position. Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. 2. Install manifold gauges, scale, and recovery unit or two-stage vacuum pump. MANIFOLD SET Important Manitowoc Ice, Inc.
Refrigeration System Section 7 2. Close the vacuum pump valve, the low side service valve, and the low side manifold gauge valve. Self-Contained Charging Procedures Important The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed. 1. Be sure the toggle switch is in the OFF position. 4. Open the charging cylinder and add the proper refrigerant charge (shown on nameplate) through the discharge service valve. 5.
Section 7 Refrigeration System NORMAL REMOTE MODEL PROCEDURES Refrigerant Recovery/Evacuation Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. 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.
Refrigeration System Section 7 HEAT EXCHANGER EVAPORATOR EXPANSION VALVE x SOLENOID VALVES LOW SIDE SERVICE VALVE (BACKSEATED) COMPRESSOR STRAINER HARVEST PRESSURE SOLENOID VALVE CHECK VALVE x HARVEST PRESSURE REGULATING VALVE x HIGH SIDE SERVICE VALVE (BACKSEATED) LIQUID LINE SOLENOID DISCHARGE LINE QUICK CONNECT SCHRAEDER FITTING DRIER REMOTE CONDENSER RECEIVER SERVICE VALVE 1/2 OPEN B CHECK VALVE R C HEAD PRESSURE CONTROL VALVE MANIFOLD SET OPEN TEE OPEN OPEN VACUUM PUMP/ RECOVE
Section 7 Remote Charging Procedures 1. Be sure the toggle switch is in the OFF position. 2. Close the vacuum pump valve, the low and high side service valves (frontseat), and the low side manifold gauge valve. Refrigeration System NOTE: Backseat the receiver outlet service valve after charging is complete and before operating the ice machine.
Refrigeration System Section 7 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER COMPRESSOR x HARVEST PRESSURE SOLENOID VALVE CHECK VALVE x HARVEST PRESSURE REGULATING VALVE SOLENOID VALVES x LOW SIDE SERVICE VALVE (BACKSEATED) HIGH SIDE SERVICE VALVE (BACKSEATED) LIQUID LINE SOLENOID DISCHARGE LINE QUICK CONNECT SCHRAEDER FITTING DRIER REMOTE CONDENSER RECEIVER SERVICE VALVE 1/2 OPEN B CHECK VALVE R C HEAD PRESSURE CONTROL VALVE MANIFOLD SET TEE CLOSED OPEN CLOSED SCALE VACUUM
Section 7 Refrigeration System SYSTEM CONTAMINATION CLEAN-UP General 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. If either condition is found, or if contamination is suspected, use a Total Test Kit from Totaline or a similar diagnostic tool.
Refrigeration System Mild System Contamination Cleanup Procedure Section 7 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. Disassemble the harvest solenoid valve. If burnout deposits are found inside the valve, install a new harvest valve, and replace manifold strainer, TXV and harvest pressure regulating valve.
Section 7 Refrigeration System 10. Follow the normal evacuation procedure, except replace the evacuation step with the following: Important Dry nitrogen is recommended for this procedure. This will prevent CFC release. REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE This procedure reduces repair time and cost. Use it when any of the following components require replacement, and the refrigeration system is operational and leak-free. • Fan cycle control (air-cooled only) A.
Refrigeration System Section 7 SV1406 Figure 7-17.
Section 7 Refrigeration System FILTER-DRIERS The filter-driers used on Manitowoc ice machines are manufactured to Manitowoc specifications. The difference between Manitowoc driers and off-theshelf driers is in filtration. Manitowoc driers have dirtretaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action which takes place during every harvest cycle.
Refrigeration System Section 7 TOTAL SYSTEM REFRIGERANT CHARGES Additional Refrigerant Charges For line sets between 50’ - 100’. Important This information is for reference only. Refer to the ice machine serial number tag to verify the system charge. Serial plate information overrides information listed on this page.
Section 7 Refrigeration System REFRIGERANT DEFINITIONS Reclaim Recover To reprocess refrigerant to new product specifications (see below) by means which may include distillation. A chemical analysis of the refrigerant is required after processing to be sure that product specifications are met. This term usually implies the use of processes and procedures available only at a reprocessing or manufacturing facility.
Refrigeration System REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of, CFC and HCFC refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’ products to achieve this. Important Manitowoc Ice, Inc. assumes no responsibility for use of contaminated refrigerant.
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). R404A is used in ice machines and reach-in freezers and R-134A is used in reach-in refrigerators. 1. What compressor oil does Manitowoc require for use with HFC refrigerants? Manitowoc products use Polyol Ester (POE) type compressor oil. It is the lubricant of choice among compressor manufacturers. 2.
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