Page 1 Undercounter Ice Machines Technician’s Handbook This manual is updated as new information and models are released. Visit our website for the latest manual. www.manitowocice.com Part Number 000014797 Rev02 05/19...
Page 3 Safety Notices Read these precautions to prevent personal injury: • Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death. • Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.
Page 4 Warning Follow these electrical requirements during installation of this equipment. • All field wiring must conform to all applicable codes of the authority having jurisdiction. It is the responsibility of the end user to provide the disconnect means to satisfy local codes. Refer to rating plate for proper voltage.
Page 5 Warning Follow these precautions to prevent personal injury during installation of this equipment: • Installation must comply with all applicable equipment fire and health codes with the authority having jurisdiction. • To avoid instability the installation area must be capable of supporting the combined weight of the equipment and product.
Page 6 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Legs or casters must be installed and the legs/casters must be screwed in completely. When casters are installed the mass of this unit will allow it to move uncontrolled on an inclined surface.
Page 7 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Objects placed or dropped in the bin can affect human health and safety. Locate and remove any objects immediately. • Never use sharp objects or tools to remove ice or frost.
Page 8 DANGER Follow these precautions to prevent personal injury during use and maintenance of this equipment: • It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures. • Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other...
Page 9: Table Of Contents
Table of Contents General Information Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 How to Read a Model Number .
Page 10 Operation Sequence of Operation U0140/UF0140/U0190/ UF0190/UF0240/U0240/U0310/UF0310 . . . . . . 65 Touch Pad Features . . . . . . . . . . . . . . . . . . . . . . . . 65 Ice Making Sequence of Operation .
Page 11 Troubleshooting Troubleshooting U0140/UF0140/U0190/ UF0190/U0240/UF0240/U0310/UF0310 . . . . . . 89 Problem Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 89 Control Board Test Mode .
Page 12 Troubleshooting UDE0065 . . . . . . . . . . . . . . . . . . . 130 Diagnosing an ice machine that will not run .
Page 13 Component Check Procedures Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Bin Switch UDE0080/U0140/UF0140/U0190/UF0190/ U0240/UF0240/U0310/UF0310 .
Page 14 Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Refrigerant Recovery/Evacuation .
Page 15 Charts Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts . . . . . . . . . . . . . . . . . . 216 UDE0065 Operating Temperatures .
Page 16 Electronic Control Boards . . . . . . . . . . . . . . . . . . . . 242 Electronic Control Board UF Models .
Page 17: General Information
General Information Model Numbers This manual covers the following models: Self-contained Self-contained Air-cooled Water-cooled UDE0065A – UDE0080A – UDF0140A – UYF0140A – URF0140A – UYP0140A – UDF0190A – UYF0190A – UDF0240A UDF0240W UYF0240A UYF0240W UDF0310A UDF0310W UYF0310A UYF0310W URF0310A URF0310W Self-contained Self-contained Air-cooled...
Page 18 Self-contained Self-contained Air-cooled Water-cooled UD0140A UD0140W UD0140AE UD0140WE UY0140A UY0140W UY0140AE UY0140WE UR0140A – UR0140AE – UD0190A – UD0190AE – UY0190A – UY0190AE – UR0190A – UR0190AE – UD0240A UD0240W UD0240AE UD0240WE UY0240A UY0240W UY0240AE UY0240WE UR0240A – UR0240AE – UD0310A UD0310W UD0310AE...
Page 19: How To Read A Model Number
How to Read a Model Number Cube Size Capacity Condenser Series Type U D F 0140 A E Refrigerant E - WRAS 50Hz E - R134A F - R404a P - R290 R - Regular Blank - Not A - Air-cooled D - Dice Indicated W - Water-cooled Y - Half-dice...
Page 20: Warranty
Warranty For warranty information visit: www.manitowocice.com/Service/Warranty • Warranty Coverage Information • Warranty Registration • Warranty Verification Warranty coverage begins the day the ice machine is installed. WARRANTY REGISTRATION Completing the warranty registration process is a quick and easy way to protect your investment. Scan the QR code with your smart device or enter the link in a web browser to complete your warranty registration.
Page 21: Installation
Installation Location of Ice Machine The location selected for the ice machine must meet the following criteria. If any of these criteria are not met, select another location. • The location must be indoors. • The location must be free of airborne and other contaminants.
Page 22: Ice Machine Clearance Requirements
Ice Machine Clearance Requirements Self-contained Self-contained Air-cooled Water-cooled Top/Sides 5" (127 mm)* 5" (127 mm)* Back 5" (127 mm)* 5" (127 mm)* *The ice machine may be built into a cabinet. Ice Machine Heat of Rejection Series Heat of Rejection* Ice Machine Air Conditioning** Peak...
Page 23: Leveling The Ice Machine
Leveling the Ice Machine 1. Screw the legs onto the bottom of the ice machine. 2. Screw the foot of each leg in as far as possible. Caution The legs must be screwed in tightly to prevent them from bending. 3.
Page 24: Electrical Requirements
Electrical Requirements Voltage The maximum allowable voltage variation is ±10% of the rated voltage on the ice machine model/serial number plate at start-up (when the electrical load is highest). Fuse/Circuit Breaker A separate fuse/circuit breaker must be provided for each ice machine.
Page 25 Water-cooled Ice Machine Voltage Phase Max. Fuse/ Ice Machine Total Amps Cycle Circuit Breaker 115/1/60 U0240 208-230/1/60 UF0240 230/1/50 115/1/60 10.0 U0310 208-230/1/60 UF0310 230/1/50 NOTE: Model/serial plate information overrides all data listed in this chart. Warning All wiring must conform to local, state and national codes.
Page 26: Water Service/Drains
Water Service/Drains WATER SUPPLY Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste. Importar If you are installing a Manitowoc water filter system, refer to the Installation Instructions supplied with the filter system for ice making water inlet connections.
Page 27: Cooling Tower Applications
Drain Connections Follow these guidelines when installing drain lines to prevent drain water from flowing back into the ice machine and storage bin: • Drain lines must have a 1.5-inch drop per 5 feet of run (2.5 cm per meter), and must not create traps. •...
Page 28 Water Supply and Drain Line Sizing/Connections Part Number 000014797 Rev02 05/19...
Page 29: Maintenance
Maintenance Interior Cleaning and Sanitizing General Descale and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent descaling and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.
Page 30 Touch Pad Operation Pressing and holding the clean button for 3 seconds starts the cycle. The Clean & On/Off lights energize indicating the cycle has started and ice making will automatically start when the cycle is complete. • Setting the ice machine to stop after the cycle: Press the On/Off button.
Page 31 Caution Do not mix Ice Machine Cleaner/Descaler and Sanitizer solutions together. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling. To start a descaling cycle, select Clean. Water Step 3 will flow through the water dump valve and down the drain.
Page 32 Mix a solution of cleaner/descaler and warm Step 5 water. Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly descale all parts. Solution Type Water Mixed with...
Page 33 Mix a solution of sanitizer and warm water. Step 7 Solution Type Water Mixed With Sanitizer 3 gal. (12 l) 2 oz (60 ml) sanitizer part number 9405653 Use half of the sanitizer/water solution to sanitize all removed components. Use a spray bottle to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution.
Page 34 Remove Parts for Descaling Warning Disconnect electric power to the ice machine at the electric switch box before proceeding. 1. Remove the Harvest Float Switch and Ice Thickness Float Switch • Pull forward on the bottom of the bracket until clear of the tab, then slide bracket upward to remove the bracket and float as an assembly.
Page 35 WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD PULL THROUGH GROMMET TO DISCONNECT HARVEST FLOAT ICE THICKNESS FLOAT SWITCH & BRACKET SWITCH & BRACKET DISCONNECT WIRES FOR COMPLETE REMOVAL Caution Do not disassemble float for descaling - Incorrect reassembly will result in an ice machine that will not harvest.
Page 36 2. Remove the Water Trough Thermistor and Water Trough • Remove the upper thumbscrew. • While supporting the water trough remove the thumbscrew and thermistor. • While supporting the water trough remove the lower thumbscrew from beneath the water trough. •...
Page 37 3. Remove the Ice Damper • Remove thumbscrew from bin switch cover. • Support ice damper and then pull bin switch cover and ice damper forward to remove. 1. REMOVE THUMBSCREW 2. SUPPORT ICE DAMPER THEN SLIDE RIGHT SIDE FORWARD TO REMOVE Part Number 000014797 Rev02 05/19...
Page 38 4. Remove the Water Distribution Tube • Distribution tube thumbscrews are retained to prevent loss. Loosen thumbscrews but do not pull thumbscrews out of distribution tube. • Loosen the two outer screws and pull forward on the distribution tube to release. NOTE: For ease of assembly when reinstalling the water distribution tube, install the top edge first.
Page 39: Remedial Cleaning
REMEDIAL CLEANING This procedure can be performed between the bi-annual detailed descaling and sanitizing cycles. This procedure does not require removing the ice from the bin. Press the On/Off button after ice falls from the Step 1 evaporator at the end of a Harvest cycle. Or, press the On/ Off button and allow the ice to melt off the evaporator.
Page 40 Ice Machine Inspection Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc. Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.
Page 41: Cleaning The Condenser
CLEANING THE CONDENSER General Warning Disconnect electric power to the ice machine head section and the remote condensing unit at the electric service switches before cleaning the condenser. A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life.
Page 42: Removal From Service/Winterization
REMOVAL FROM SERVICE/WINTERIZATION Self-contained Air-cooled ice machines 1. Descale and sanitize the ice machine. 2. Press the On/Off button to turn off the ice machine. 3. Turn off the water supply, disconnect and drain the incoming ice-making water line at the rear of the ice machine and drain the water trough.
Page 43: Bin Removal
BIN REMOVAL U0140/UF140/U0190/UF190/U0240/UF0240/U0310/ UF0310 1. Disconnect power. 2. Remove all ice from bin. 3. Remove air filter and louver from lower front of machine. 4. Loosen screws and rotate clips to release bin from base. 5. Disconnect clamp and remove bin drain. 6.
Page 44: Detailed Descaling And Sanitizing Procedure
Detailed Descaling and Sanitizing Procedure UDE0065 Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime. Move the toggle switch to Off after ice falls Step 1 from the evaporator at the end of a Harvest cycle. Or, set the toggle switch to Off and allow the ice to melt off the evaporator.
Page 45 Wait until the cycle is complete (approximately Step 5 45 minutes) then place the toggle switch in the Off position and disconnect power and water supplies to the ice machine. Warning Disconnect electric power to the ice machine at the electric switch box before proceeding.
Page 46 Remove the Water Pump • Remove the two thumbscrews and the water pump cover. • Disconnect the water pump power cord. • Loosen the screws that hold the water pump in place. • Lift the water pump and bracket assembly up and off the screws.
Page 47 While components are soaking, use ½ of Step 9 the cleaner/descaler and water solution to descale all foodzone surfaces of the ice machine and bin. Use a nylon brush or cloth to thoroughly descale the following ice machine areas: • Evaporator plastic parts –...
Page 48 Reapply power and water to the ice machine Step 14 and place the toggle switch in the WASH position. Add the proper amount of Manitowoc Ice Step 15 Machine Sanitizer to the water trough. Model Amount of Sanitizer Part Number 9405653 UDE0065 1.5 ounces (45 ml) Wait until the sanitize cycle is complete...
Page 49 Use 1/2 of the sanitizer/water solution to Step 20 sanitize all foodzone surfaces of the ice machine and bin. Use a cloth or sponge to liberally apply the solution. When sanitizing, pay particular attention to the following areas: • Evaporator plastic parts - including top, bottom and sides.
Page 50: Cleaning The Condenser
CLEANING THE CONDENSER A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below. 1. The washable aluminum filter on self-contained ice machines is designed to catch dust, dirt, lint and grease.
Page 51: Removal From Service/Winterization
REMOVAL FROM SERVICE/WINTERIZATION Self-contained Air-cooled ice machines 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 320F (00C) or below. 1. Disconnect the electric power at the circuit breaker or the electric service switch.
Page 52: Detailed Descaling And Sanitizing Procedure
Detailed Descaling and Sanitizing Procedure UDE0080 Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime. Move the toggle switch to Off after ice falls Step 1 from the evaporator at the end of a Harvest cycle. Or, set the toggle switch to Off and allow the ice to melt off the evaporator.
Page 53 Wait until the cycle is complete (approximately Step 5 22 minutes) then place the toggle switch in the Off position and disconnect power and water supplies to the ice machine. Warning Disconnect electric power to the ice machine at the electric switch box before proceeding.
Page 54 Remove the Ice Thickness Probe • Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket. NOTE: At this point, the ice thickness probe can easily be descaled. If complete removal is desired follow the ice thickness probe wire to the bulkhead grommet (exit point) in the back wall.
Page 55 Remove the Water Distribution Tube • Loosen the two thumbscrews, which secure the distribution tube. • Lift the distribution tube up off the thumbscrews. Disassembly • Twist the barbed end until the tab lines up with the key way. • Pull the inner tube end outward Part Number 000014797 Rev02 05/19...
Page 56 Remove the Float Valve • Turn the splash shield counterclockwise one or two turns. • Pull the float valve forward and off the mounting bracket. • Disconnect the water inlet tube from the float valve at the compression fitting. • Remove the cap and filter screen for descaling.
Page 57 Remove the Water Trough • Apply downward pressure on the siphon tube and remove from the bottom of the water trough. • Remove the upper thumbscrew. • While supporting the water trough remove the two thumbscrews from beneath the water trough. •...
Page 58 Remove the ice damper. • Grasp left side of ice damper and apply pressure against the right-hand ice damper mounting bracket. • Pull forward on the ice damper until the left hand mounting pin disengages. Installation • Grasp the right side of ice damper and place left hand pin in the mounting bracket.
Page 59 Remove the Bin Door • Grasp the rear of the bin door and pull bin door forward approximately 5”. • Slide bin door to the rear while applying upward pressure (The rear door pins will ride up into the track slot and slide backward to the stop tab).
Page 60 Mix a solution of cleaner/descaler and warm Step 7 water. Depending on the amount of mineral buildup, a larger quantity of solution may be required. Use the ratio in the table below to mix enough solution to thoroughly descale all parts. Solution Type Water Mixed with...
Page 61 Use 1/2 of the sanitizer/water solution to Step 11 sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution. Do not rinse parts after sanitizing. Use 1/2 of the sanitizer/water solution to Step 12 sanitize all foodzone surfaces of the ice machine and bin.
Page 62 Mix a solution of sanitizer and warm water. Step 18 Solution Type Water Mixed With Sanitizer 6 gal. (23 l) 4 oz (120 ml) sanitizer part number 9405653 Use 1/2 of the sanitizer/water solution to Step 19 sanitize all removed components. Use a cloth or sponge to liberally apply the solution to all surfaces of the removed parts or soak the removed parts in the sanitizer/water solution.
Page 63: Cleaning The Condenser
CLEANING THE CONDENSER A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below. 1. The washable aluminum filter on self-contained ice machines is designed to catch dust, dirt, lint and grease.
Page 64: Removal From Service/Winterization
REMOVAL FROM SERVICE/WINTERIZATION Self-contained Air-cooled ice machines 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 320F (00C) or below. 1. Disconnect the electric power at the circuit breaker or the electric service switch.
Page 65: Sequence Of Operation U0140/Uf0140/U0190/ Uf0190/Uf0240/U0240/U0310/Uf0310
Operation Sequence of Operation U0140/UF0140/U0190/ UF0190/UF0240/U0240/U0310/UF0310 TOUCH PAD FEATURES The touch pad offers a series of pressure sensitive buttons to control ice machine operation and provide operational status. On/Off - Blue = Machine On Off = Machine Is Off Delay - Blue = Delay Mode On Off = Delay Mode Is Off Clean - Yellow = Clean Cycle On Off = Cleaning is Off...
Page 66 On/Off The On/Off Button is used to start and stop ice making. The blue light indicates whether the ice machine is in Ice Making (light on) or Off (light off). NOTE: Stopping and restarting a freeze cycle with ice on the evaporator will result in a thick bridge and larger than normal cubes;...
Page 67 Clean Pressing the Clean button for 3 seconds will start a clean cycle. After the clean cycle is complete, the ice machine will automatically start an ice making cycle. • Pressing the Clean button again within 45 seconds of the clean cycle starting will abort the clean cycle. •...
Page 68: Ice Making Sequence Of Operation
Ice Making Sequence of Operation CONTROL BOARD REVISIONS 1. Original control board 2. Control board with J4 terminal, which can utilize a thermistor to control when/if a water pump delay occurs in the freeze cycle. 3. Control board with the addition of J8 & J9 terminals. The J8 terminal can control an EC fan motor.
Page 69: Sequence Of Operation
SEQUENCE OF OPERATION The On/Off button must be depressed and the ice damper must be closed before the ice machine will start. The following is the primary sequence of operation. Software revisions will alter some of the timing sequences and are noted in software revisions. Initial Start-up From Shutoff The dump valve energizes to purge any water in the water trough down the drain.
Page 70 Full Bin Cycle If the ice damper is held open by ice cubes the ice machine shuts off. When the ice damper closes the ice machine starts a new cycle at Initial Start-up From Shutoff. The ice machine will remain off for a 3 minute delay period. Thaw Cycle The maximum harvest time is a total of 7 minutes.
Page 71: Control Board Timers
CONTROL BOARD TIMERS • The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can be initiated. • The freeze time lock in feature is bypassed on the initial cycle (manual start or after a full bin/safety limit condition).
Page 72: Safety Limits
SAFETY LIMITS Safety limits are stored and indicated by the control board. The number of cycles required to stop the ice machine varies for each safety limit. Safety limits can be reset by pressing the On/Off button and starting a new ice making cycle. A safety limit shutdown is indicated by the red Service light on the touch pad.
Page 73 Safety Limit 3 If the freeze time reaches 4 minutes and water is not sensed (float remains down for 10 continuous seconds) the ice machine stops. • Safety Limit 3 is bypassed on the initial cycle (manual start or after a full bin/safety limit condition). For all subsequent cycles if the freeze time reaches 4 minutes and water is not sensed, the ice machine stops and initiates a 30 minute delay period.
Page 74 Part Number 000014797 Rev02 05/19...
Page 75 Part Number 000014797 Rev02 05/19...
Page 76: Operational Checks
Operational Checks ICE THICKNESS CHECK After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice bridge connects the ice cubes and must be set to maintain an ice bridge thickness of 1/8" (3.2 mm). To adjust the thickness of the bridge refer to ice thickness adjustment.
Page 77: Minimum/Maximum Slab Weight
MINIMUM/MAXIMUM SLAB WEIGHT Minimum Maximum Model Ice Weight Per Cycle Ice Weight Per Cycle Grams Grams U0140 1.13 lbs 1.36 lbs UF0140 513 grams 617 grams 2.26 lbs 2.93 lbs U0190/UF0190 1025 grams 1329 grams U0240 2.26 lbs 2.93 lbs UF0240 1025 grams 1329 grams...
Page 78: Sequence Of Operation Ude0065
Sequence of Operation UDE0065 Initial startup or startup after automatic shut-off 1. Water Purge The water fill valve and the hot gas valve are energized for 2.9 minutes (175 seconds). This ensures that the ice making cycle starts with fresh water, and that the refrigerant pressures are equalized prior to refrigeration system start-up.
Page 79 4. Harvest Cycle The condenser fan motor and water pump de-energize. The water fill valve energizes to purge the water in the water trough. The hot gas valve also energizes at the beginning of the harvest cycle to divert hot refrigerant gas into the evaporator.
Page 80: Ude0065 Energized Parts Chart
Part Number 000014797 Rev02 05/19...
Page 81: Ice Thickness Adjustment
ICE THICKNESS ADJUSTMENT It is normal to have a dimple in the ice cube (a concave indentation in the cube). Cube size is determined by measuring the slab weight (the combined weight of all cubes from one harvest cycle). To determine proper slab weight follow the instructions listed below.
Page 82: Sequence Of Operation Ude0080
Sequence of Operation UDE0080 Initial start-up or start-up after automatic shut-off 1. Pressure Equalization Before the compressor starts the hot gas valve is energized for 15 seconds to equalize pressures during the initial refrigeration system start-up. 2. Refrigeration System Start-up The compressor starts after the 15-second pressure equalization, and remains on throughout the entire Freeze and Harvest Sequences.
Page 83 5. Harvest The water pump de-energizes stopping flow over the evaporator. The rising level of water in the sump trough diverts water out of the overflow tube, purging excess minerals from the sump trough. The hot gas valve also opens to divert hot refrigerant gas into the evaporator. The refrigerant gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage bin.
Page 84: Ude0080 Energized Parts Chart
Part Number 000014797 Rev02 05/19...
Page 85 Part Number 000014797 Rev02 05/19...
Page 86: Operational Checks Ude0080
Operational Checks UDE0080 SIPHON SYSTEM To reduce mineral build-up and cleaning frequency, the water in the sump trough must be purged during each harvest cycle. When the water pump de-energizes the level in the water trough rises above the standpipe starting a siphon action. The siphon action stops when the water level in the sump trough drops.
Page 87: Water Level Check
WATER LEVEL CHECK The float valve is factory-set for the proper water level. If adjustments are necessary: 1. Verify the ice machine is level. 2. Remove the siphon cap from the standpipe. 3. Place the main ON/OFF/WASH toggle switch to the ON position, and wait until the float valve stops adding water.
Page 88: Ice Thickness Check
ICE THICKNESS CHECK After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is set to maintain an ice bridge of 1/8” (3.2 mm). If an adjustment is needed, follow the steps below. 1.
Page 89: Troubleshooting
Troubleshooting Troubleshooting U0140/UF0140/U0190/ UF0190/U0240/UF0240/U0310/UF0310 NOTE: Refer to “Troubleshooting UDE0065” on page 130 and “Troubleshooting UDE0080” on page 154 for these models. PROBLEM CHECKLIST Problem Possible Cause Correction No electrical power to Replace the fuse/reset the the ice machine. breaker/turn on the main switch/plug power cord into receptacle.
Page 90 Problem Possible Cause Correction The six-minute freeze Wait for freeze lock-in to time lock-in has not expire. expired yet. Harvest float switch Descale and sanitize the ice Ice machine does is dirty. machine. not cycle into Harvest float switch Connect the wire wire is disconnected.
Page 91 Problem Possible Cause Correction Water trough level is Adjust ice thickness float too high Power button was Allow ice to thaw turned off/on during and release from the the freeze cycle and evaporator, then restart ice remained on the evaporator Ice sheet is thick Ice damper was opened Allow ice to thaw...
Page 92: Control Board Test Mode
CONTROL BOARD TEST MODE NOTE: The ice damper/bin switch can be open or closed and does not effect the operation of the test mode. To enter the test mode press and hold the test switch on the control board for 3 seconds. Refer to “Electronic Control Board UF Models”...
Page 93: Diagnosing An Ice Machine That Will Not Run
DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board at all times. Removing the control board fuse or pressing the power button will not remove the power supplied to the control board. 1.
Page 94: Ice Machine Does Not Cycle Into Harvest When The Harvest Float Is Down/Closed
ICE MACHINE DOES NOT CYCLE INTO HARVEST WHEN THE HARVEST FLOAT IS DOWN/CLOSED NOTE: The ice machine will make a thick or double slab when a new freeze cycle is started with ice already present on the evaporator. Two of the most common scenarios are: •...
Page 95 Disconnect power to the ice machine, remove Step 1 the electrical panel to allow viewing of the control board lights and pull the wire connector for the harvest float switch through the bulkhead and disconnect. Attach a jumper wire to the wire terminals connected to the control board.
Page 96: Ice Machine Cycles Into Harvest Before The Harvest Float Is Down/Closed
ICE MACHINE CYCLES INTO HARVEST BEFORE THE HARVEST FLOAT IS DOWN/CLOSED Disconnect power to the ice machine, remove Step 1 the electrical panel to allow viewing of the control board lights and pull the wire connector for the harvest float switch through the bulkhead and disconnect.
Page 97 Reapply power and press the power button to Step 2 cycle the ice machine off/on and bypass the freeze time lock-in feature. Wait until water flows over the evaporator, then refer to chart. Result Correction The harvest light does not come on The ice thickness float and the ice machine stays in freeze.
Page 98: Ice Production Check
ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21°C) ambient temperature and 50°F (10°C) water produces more ice than the same ice machine with 90°F (32°C) ambient and 70°F (21°C) water.
Page 99 Weighing the ice is the only 100% accurate check. 4. Compare the results of step 3 with step 2. Ice production is normal when these numbers match closely. If they match closely, determine if: • Another larger ice machine is required. •...
Page 100: Installation/Visual Inspection Checklist
INSTALLATION/VISUAL INSPECTION CHECKLIST Ice machine is not level • Level the ice machine Condenser is dirty • Clean the condenser Water filtration is plugged (if used) • Install a new water filter Water drains are not run separately and/or are not vented •...
Page 101: Water System Checklist
WATER SYSTEM CHECKLIST A water-related problem often causes the same symptoms as a refrigeration system component malfunction. Example: A water dump valve leaking during the freeze cycle, a system low on charge, and a starving TXV have similar symptoms. Water system problems must be identified and eliminated prior to replacing refrigeration components.
Page 102: Ice Formation Pattern
ICE FORMATION PATTERN Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. 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.
Page 103 Extremely Thin at Evaporator Outlet There is no ice, or a considerable lack of ice formation on the outlet of the evaporator. Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the outlet of the evaporator already has 1/2”...
Page 104: Safety Limit Feature
SAFETY LIMIT FEATURE In addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure. Service Light: The Service light energizes whenever a safety limit has been exceeded.
Page 105 Safety Limit 3 If the freeze time reaches 4 minutes and water is not sensed (float remains down for 10 continuous seconds) the ice machine stops. • Safety Limit 3 is bypassed on the initial cycle (manual start or after a full bin/safety limit condition). For all subsequent cycles if the freeze time reaches 4 minutes and water is not sensed, the ice machine stops and initiates a 30 minute delay period.
Page 106 Determining Which Safety Limit Stopped the Ice Machine: When a safety limit condition causes the ice machine to stop, the safety limit light on the control board continually flashes on and off. CONTROL BOARD SAFETY LIMIT LIGHT OPERATION, BEFORE THE POWER BUTTON HAS BEEN CYCLED ON/ OFF: Watch the safety limit lights on the control board: •...
Page 107 Safety Limit Checklist The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed. Safety Limit #1 Freeze time exceeds 45 minutes for 3 consecutive freeze cycles.
Page 108 Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensible in refrigeration system • Plugged or restricted high side refrigerant lines or component • Defective harvest valve Part Number 000014797 Rev02 05/19...
Page 109 Safety Limit #2 Harvest time exceeds 3.5 minutes for 3 Consecutive harvest cycles. Possible Cause Checklist Improper installation • Refer to “Installation/Visual Inspection Checklist” on page 100 Water System • Water area (evaporator) dirty • Dirty/defective water dump valve • Vent tube not installed on water outlet drain •...
Page 110 Safety Limit 3 Freeze time reaches 4 minutes and water is not sensed. Possible Cause Checklist Improper installation • Refer to “Installation/Visual Inspection Checklist” on page 100 Water System • Dirty/defective water dump valve • Low water float valve dirty or defective •...
Page 111: Analyzing Discharge Pressure
ANALYZING DISCHARGE PRESSURE 1. Determine the ice machine operating conditions: Air temperature entering condenser ______ Air temperature around ice machine ______ Water temperature entering sump trough ______ 2. Refer to “Installation/Visual Inspection Checklist” on page 100 for ice machine being checked. Use the operating conditions determined in step 1 to find the published normal discharge pressures.
Page 112 Discharge Pressure High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 100 Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan cycling control • Defective fan motor Improper Refrigerant Charge •...
Page 113: Analyzing Suction Pressure
ANALYZING SUCTION PRESSURE The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction pressure drop throughout the freeze cycle, compare the published suction pressure to the published freeze cycle time.
Page 114 Procedure Step 1. Determine the ice machine operating conditions. Example: Air temperature entering condenser: 90°F/32.2°C Air temperature around ice machine: 80°F/26.7°C Water temperature entering water fill valve: 70°F/21.1°C 2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice machine model being checked. Using operating conditions from Step 1, determine published freeze cycle time and published freeze cycle suction pressure.
Page 115 Suction Pressure High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 100 Discharge Pressure • Discharge pressure is too high, and is affecting suction pressure, refer to “Discharge Pressure High Checklist” on page 112. Improper Refrigerant Charge •...
Page 116 Suction Pressure Low Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 100 Discharge Pressure • Discharge pressure is too low, and is affecting suction pressure, refer to “Freeze Cycle Discharge Pressure Low Checklist” on page 112. Improper Refrigerant Charge •...
Page 117: Harvest Valve
HARVEST VALVE General The harvest valve is an electrically operated valve that opens when energized, and closes when de-energized. Normal Operation The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the receiver and the evaporator and performs two functions: 1.
Page 118 Harvest Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. VALVE WILL NOT OPEN IN THE HARVEST CYCLE Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
Page 119 Use the following procedure and table to help determine if a harvest valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the harvest valve(s). Ipprttat Feeling the harvest valve outlet or across the harvest valve itself will not work for this comparison.
Page 120 Findings Comments The inlet of the harvest valve This is normal as the discharge is cool enough to touch and line should always be too hot to the compressor discharge touch and the harvest valve inlet, line is hot. although too hot to touch during harvest, should be cool enough to touch after 5 minutes into the Cppl &...
Page 121: Comparing Evaporator Inlet/Outlet
COMPARING EVAPORATOR INLET/OUTLET TEMPERATURES The temperatures of the suction lines entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle, along with using Manitowoc’s Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.
Page 122: Discharge Line Temperature Analysis
DISCHARGE LINE TEMPERATURE ANALYSIS GENERAL Knowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.
Page 123 Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle: Ice machines that are operating normally will have consistent maximum discharge line temperatures above 150°F (66°C). Verify the expansion valve sensing bulb is positioned and secured correctly. Discharge Line Temperature Below 150°F (66°C) at End of Freeze Cycle Ice machines that have a flooding expansion valve will have a maximum discharge line temperature that decreases...
Page 124: Refrigeration Component Diagnostics
REFRIGERATION COMPONENT DIAGNOSTICS All electrical and water related problems must be corrected before these charts will work properly. These tables must be used with charts, checklists and other references to eliminate refrigeration components not listed and external items and problems that will cause good refrigeration components to appear defective.
Page 125 Final Analysis The column with the highest number of check marks identifies the refrigeration problem. Column 1 – Harvest Valve Leaking A leaking harvest valve must be replaced. Column 2 – Low Charge/TXV Starving Normally, a starving expansion valve only affects the freeze cycle pressures, not the harvest cycle pressures.
Page 126: Refrigeration Analysis Chart
Part Number 000014797 Rev02 05/19...
Page 127 Part Number 000014797 Rev02 05/19...
Page 128 Part Number 000014797 Rev02 05/19...
Page 129 Part Number 000014797 Rev02 05/19...
Page 130: Troubleshooting Ude0065
Troubleshooting UDE0065 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #2 and #4) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.
Page 131: Refrigeration Diagnostics Overview Ude0065
REFRIGERATION DIAGNOSTICS OVERVIEW UDE0065 UDE0065 ice machines have a very small refrigerant charge and we do not recommend diagnosing the ice machine using refrigerant pressures. For this reason refrigeration access fittings are not installed during production and the ice machine is diagnosed with temperatures. Verify that your water flow is even across the entire evaporator before diagnosing the refrigeration system.
Page 132 Normal Operation Example below is for normal operation at 86°F (30°C) air temperature 68°F (20°C) water temperature. FREEZE CYCLE • Normal suction line temperature at the compressor will range from 86°F (30°C) three minutes into the cycle to 8°F (-13°C) at the end of the freeze cycle. •...
Page 133 Abnormal temperatures Higher than normal freeze cycle temperatures. • A dirty filter or condenser will result in higher than normal temperatures. Always clean the filter and condenser before diagnosing the refrigeration system. • Hot water entering the ice machine will result in high suction and discharge line temperatures in the freeze cycle.
Page 134: Ice Production Check
ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21°C) ambient temperature and 50°F (10°C) water produces more ice than the same ice machine with 90°F (32°C) ambient and 70°F (21°C) water.
Page 135 Weighing the ice is the only 100% accurate check. 4. Compare the results of step 3 with step 2. Ice production is normal when these numbers match closely. If they match closely, determine if: • Another larger ice machine is required. •...
Page 136: Installation/Visual Inspection Checklist
INSTALLATION/VISUAL INSPECTION CHECKLIST Ice machine is not level • Level the ice machine Condenser is dirty • Clean the condenser Water filtration is plugged (if used) • Install a new water filter Water drains are not run separately and/or are not vented •...
Page 137: Water System Checklist
WATER SYSTEM CHECKLIST A water-related problem often causes the same symptoms as a refrigeration system component malfunction. Water system problems must be identified and eliminated prior to replacing refrigeration components. Water area (evaporator) is dirty • Descale as needed Water inlet pressure not between 20 and 80 psig (1–5 bar, 138–552 kPa) •...
Page 138: Ude0065 Refrigeration Diagnostics
UDE0065 Refrigeration Diagnostics Perform the procedures on the preceding pages before performing refrigeration diagnostics. The first pages cover an overview of the diagnostic procedures followed by diagnostics checklists. Install thermometer thermocouples on Suction and Discharge line: • Digital thermometers with remote thermocouples must be used to obtain temperatures.
Page 139: Flooding Expansion Valve Symptoms
FLOODING EXPANSION VALVE SYMPTOMS A flooding expansion valve will have discharge and suction line temperatures 20°F (-7°C) lower than normal freeze cycle temperatures. Normal suction line temperature and low discharge line temperature DO NOT verify a flooding valve. Both discharge line temperature and suction line temperature must be low to verify a flooding expansion valve.
Page 140: Analyzing Ice Formation Pattern
ANALYZING ICE FORMATION PATTERN Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. 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.
Page 141 Extremely Thin at Evaporator Outlet There is no ice, or a considerable lack of ice formation on the outlet of the evaporator. Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the outlet of the evaporator already has 1/2”...
Page 142: Analyzing Discharge Line Temperature
ANALYZING DISCHARGE LINE TEMPERATURE 1. Determine the ice machine operating conditions: Air temperature entering condenser ______ Air temperature around ice machine ______ Water temperature entering sump trough ______ 2. Refer to “Installation/Visual Inspection Checklist” on page 136 for ice machine being checked. Use the operating conditions determined in step 1 to find the published normal discharge temperatures.
Page 143 Discharge Line Temperature High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 136 Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan cycling control • Defective fan motor Improper Refrigerant Charge •...
Page 144: Analyzing Suction Line Temperature
ANALYZING SUCTION LINE TEMPERATURE The suction line temperature gradually drops throughout the freeze cycle. The actual suction temperature (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction temperature drop throughout the freeze cycle, compare the published suction temperature to the published freeze cycle time.
Page 145 Suction Temperature High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 136 Discharge Pressure • Discharge temperature is too high, and is affecting suction temperature, refer to “Discharge Line Temperature High Checklist” on page 143. Improper Refrigerant Charge •...
Page 146 Suction Temperature Low Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 136 Discharge Pressure • Discharge temperature is too low, and is affecting suction temperature, refer to “Freeze Cycle Discharge Temperature Low Checklist” on page 143. Improper Refrigerant Charge •...
Page 147: Comparing Evaporator Inlet/Outlet
COMPARING EVAPORATOR INLET/OUTLET TEMPERATURES The temperatures of the suction line entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle can help diagnose an ice machine malfunction. The actual temperatures entering and leaving the evaporator vary by model, and change throughout the freeze cycle.
Page 148: Discharge Line Temperature Analysis
DISCHARGE LINE TEMPERATURE ANALYSIS GENERAL Knowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.
Page 149 Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle: Ice machines that are operating normally will have consistent maximum discharge line temperatures above 150°F (66°C). Verify the expansion valve sensing bulb is positioned and secured correctly. Discharge Line Temperature Below 150°F (66°C) at End of Freeze Cycle Ice machines that have a flooding expansion valve will have a maximum discharge line temperature that decreases...
Page 150: Harvest Valve
HARVEST VALVE General The harvest valve is an electrically operated valve that opens when energized, and closes when de-energized. Normal Operation The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the and the evaporator and performs two functions: 1.
Page 151 Harvest Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. VALVE WILL NOT OPEN IN THE HARVEST CYCLE Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
Page 152 Use the following procedure and table to help determine if a harvest valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the harvest valve(s). Ipprttat Feeling the harvest valve outlet or across the harvest valve itself will not work for this comparison.
Page 153 Findings Comments The inlet of the harvest valve This is normal as the discharge is cool enough to touch and line should always be too hot to the compressor discharge touch and the harvest valve inlet, line is hot. although too hot to touch during harvest, should be cool enough to touch after 5 minutes into the Cppl &...
Page 154: Troubleshooting Ude0080
Troubleshooting UDE0080 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #2 and #4) at all times. Removing control board fuse or moving the toggle switch to OFF will not remove the power supplied to the control board.
Page 155: Safety Limit Feature
SAFETY LIMIT FEATURE In addition to the standard safety controls, your Manitowoc ice machine features built-in safety limits that will stop the ice machine if conditions arise which could cause a major component failure. Safety Limit #1: If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle.
Page 156 Determining Which Safety Limit Stopped the Ice Machine: When a safety limit condition causes the ice machine to stop, the harvest light on the control board continually flashes on and off. Use the following procedures to determine which safety limit has stopped the ice machine. 1.
Page 157 Safety Limit Checklist The following checklists are designed to assist the service technician in analysis. However, because there are many possible external problems, do not limit your diagnosis to only the items listed. Safety Limit #1 Freeze time exceeds 60 minutes for 6 consecutive freeze cycles.
Page 158 Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensible in refrigeration system • Plugged or restricted high side refrigerant lines or component • Defective harvest valve Part Number 000014797 Rev02 05/19...
Page 159 Safety Limit #2 Harvest time exceeds 3.5 minutes for 3 Consecutive harvest cycles. Possible Cause Checklist Improper installation • Refer to “Installation/Visual Inspection Checklist” on page 164 Water System • Water area (evaporator) dirty • Dirty/defective water dump valve • Vent tube not installed on water outlet drain •...
Page 160: Diagnosing Ice Thickness Control Circuitry
DIAGNOSING ICE THICKNESS CONTROL CIRCUITRY Ice Machine Does Not Cycle Into Harvest when Water Contacts the Ice Thickness Control Probe Bypass the freeze time lock-in feature by Step 1 moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator. Clip the jumper wire to the ice thickness probe Step 2 and any cabinet ground.
Page 161 Ice Machine Cycles Into Harvest Before Water Contact with the Ice Thickness Probe Bypass the freeze time lock-in feature by Step 1 moving the ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator, then monitor the harvest light.
Page 162: Ice Production Check
ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21°C) ambient temperature and 50°F (10°C) water produces more ice than the same ice machine with 90°F (32°C) ambient and 70°F (21°C) water.
Page 163 3. Perform an ice production check using the formula below. Freeze Harvest Total Cycle Time Time Time 1440 ÷ Minutes Total Cycle Cycles per Day in 24 Hrs. Time Weight Cycles per Actual 24-Hour of One Production Harvest Weighing the ice is the only 100% accurate check. 4.
Page 164: Installation/Visual Inspection Checklist
INSTALLATION/VISUAL INSPECTION CHECKLIST Ice machine is not level • Level the ice machine Condenser is dirty • Clean the condenser Water filtration is plugged (if used) • Install a new water filter Water drains are not run separately and/or are not vented •...
Page 165: Water System Checklist
WATER SYSTEM CHECKLIST A water-related problem often causes the same symptoms as a refrigeration system component malfunction. Water system problems must be identified and eliminated prior to replacing refrigeration components. Water area (evaporator) is dirty • Descale as needed Water inlet pressure not between 20 and 80 psig (1–5 bar, 138–552 kPa) •...
Page 166: Ude0080 Refrigeration Diagnostics
UDE0080 Refrigeration Diagnostics Perform the procedures on the preceding pages before performing refrigeration diagnostics. The first pages cover an overview of the diagnostic procedures followed by diagnostics checklists. Install thermometer thermocouples on Suction and Discharge line: • Digital thermometers with remote thermocouples must be used to obtain temperatures.
Page 167: Flooding Expansion Valve Symptoms
FLOODING EXPANSION VALVE SYMPTOMS A flooding expansion valve will have discharge and suction line temperatures 20°F (-7°C) lower than normal freeze cycle temperatures. Normal suction line temperature and low discharge line temperature DO NOT verify a flooding valve. Both discharge line temperature and suction line temperature must be low to verify a flooding expansion valve.
Page 168: Analyzing Ice Formation Pattern
ANALYZING ICE FORMATION PATTERN Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. 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.
Page 169 Extremely Thin at Evaporator Outlet There is no ice, or a considerable lack of ice formation on the outlet of the evaporator. Examples: No ice at all at the outlet of the evaporator, but ice forms at the inlet half of the evaporator. Or, the ice at the outlet of the evaporator reaches the correct thickness, but the inlet of the evaporator already has 1/2”...
Page 170: Analyzing Discharge Line Temperature
ANALYZING DISCHARGE LINE TEMPERATURE 1. Determine the ice machine operating conditions: Air temperature entering condenser ______ Air temperature around ice machine ______ Water temperature entering sump trough ______ 2. Refer to “Installation/Visual Inspection Checklist” on page 164 for ice machine being checked. Use the operating conditions determined in step 1 to find the published normal discharge temperatures.
Page 171 Discharge Line Temperature High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 164 Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan cycling control • Defective fan motor Improper Refrigerant Charge •...
Page 172: Analyzing Suction Line Temperature
ANALYZING SUCTION LINE TEMPERATURE The suction line temperature gradually drops throughout the freeze cycle. The actual suction temperature (and drop rate) changes as the air and water temperature entering the ice machine changes. These variables also determine the freeze cycle times. To analyze and identify the proper suction temperature drop throughout the freeze cycle, compare the published suction temperature to the published freeze cycle time.
Page 173 Suction Temperature High Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 164 Discharge Pressure • Discharge temperature is too high, and is affecting suction temperature, refer to “Discharge Line Temperature High Checklist” on page 171. Improper Refrigerant Charge •...
Page 174 Suction Temperature Low Checklist Improper Installation • Refer to “Installation/Visual Inspection Checklist” on page 164 Discharge Pressure • Discharge temperature is too low, and is affecting suction temperature, refer to “Freeze Cycle Discharge Temperature Low Checklist” on page 171. Improper Refrigerant Charge •...
Page 175: Comparing Evaporator Inlet/Outlet
COMPARING EVAPORATOR INLET/OUTLET TEMPERATURES The temperatures of the suction line entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle can help diagnose an ice machine malfunction. The actual temperatures entering and leaving the evaporator vary by model, and change throughout the freeze cycle.
Page 176: Discharge Line Temperature Analysis
DISCHARGE LINE TEMPERATURE ANALYSIS GENERAL Knowing if the discharge line temperature is increasing, decreasing or remaining constant can be an important diagnostic tool. Maximum compressor discharge line temperature on a normally operating ice machine steadily increases throughout the freeze cycle. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.
Page 177 Discharge Line Temperature Above 150°F (66°C) at End of Freeze Cycle: Ice machines that are operating normally will have consistent maximum discharge line temperatures above 150°F (66°C). Verify the expansion valve sensing bulb is positioned and secured correctly. Discharge Line Temperature Below 150°F (66°C) at End of Freeze Cycle Ice machines that have a flooding expansion valve will have a maximum discharge line temperature that decreases...
Page 178: Harvest Valve
HARVEST VALVE General The harvest valve is an electrically operated valve that opens when energized, and closes when de-energized. Normal Operation The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the and the evaporator and performs two functions: 1.
Page 179 Harvest Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. VALVE WILL NOT OPEN IN THE HARVEST CYCLE Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
Page 180 Use the following procedure and table to help determine if a harvest valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the harvest valve(s). Ipprttat Feeling the harvest valve outlet or across the harvest valve itself will not work for this comparison.
Page 181 Findings Comments The inlet of the harvest valve This is normal as the discharge is cool enough to touch and line should always be too hot to the compressor discharge touch and the harvest valve inlet, line is hot. although too hot to touch during harvest, should be cool enough to touch after 5 minutes into the Cppl &...
Page 182 THIS PAGE INTENTIONALLY LEFT BLANK Part Number 000014797 Rev02 05/19...
Page 183: Component Check Procedures
Component Check Procedures MAIN FUSE Function The control board fuse stops ice machine operation if electrical components fail causing high amp draw. Specifications • UDE0080/U0140/UF0140/U0190/UF0190/U0240/ UF0240/U0310/UF0310 - 250 Volt, 10 amp. • UDE0065 - 250 Volt 8 amp Warning High (line) voltage is applied to the control board at all times.
Page 184: Bin Switch
BIN SWITCH UDE0080/U0140/UF0140/U0190/UF0190/U0240/ UF0240/U0310/UF0310 Function Bin switch operation is controlled by the movement of the ice damper. The bin switch has two main functions: 1. Terminating the harvest cycle and returning the ice machine to the freeze cycle. This occurs when the bin switch is opened and closed again within 7 seconds of opening during the harvest cycle.
Page 185 Check Procedure 1. Press the power button to OFF. 2. Watch the curtain light on the control board. 3. Move the ice damper upward, toward the evaporator. The bin switch must close. The curtain light “on” indicates the bin switch has closed properly. 4.
Page 186 TOUCH PAD U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/ UF0310 Function User interface to select ice making, delay start or cleaning cycle and provides feedback on ice machine operation. Check For Normal Operation Action Normal Function Press and hold the control All Touch Pad lights turn on board test button for 3 seconds Press test button All Touch Pad lights turn off...
Page 187 Ohm Test Disconnect power from ice machine. Disconnect wire from control board and Ohm touch pad and interconnecting wire to verify correct operation. Pressing and depressing the touch pad must open and close the circuit. A switch that functions correctly will close as the button is pressed and open as the button is released.
Page 188: Float Switch
FLOAT SWITCH U0140/UF0140/U0190/UF0190/UF0240/U0240/U0310/ UF0310 Function Open and close to indicate to the control board the level of water in the water trough. Specifications Normally closed, float operated magnetic reed switch. The float switch contacts are closed in the down position. When water raises the float to the up position the magnet in the float opens the contacts.
Page 189 Ice Thickness Float Switch: The light must be off in the down position. The light must be on in the up position. If the control board light does not respond to the float proceed with step 1 below. 1. Disconnect power to the ice machine, pull the wire connector for the float switch through the bulkhead and disconnect.
Page 190: Water Trough Thermistor
WATER TROUGH THERMISTOR U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/ UF0310 Function Thermistor resistance values change with temperature. The value supplied to the control board is used to identify temperature at the thermistor location. When the resistance value indicates a temperature of 34°F (1.1°C) the control board will delay the water pump for 25 seconds.
Page 191 THERMISTOR CHART Importar If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad. Temperature of Thermistor Resistance °C °F K Ohms (x1000) -7 - -1.0 19 - 30 47.06 - 34.36 32.65 31.82 33.8 31.03...
Page 192: Bin Thermostat
BIN THERMOSTAT UDE0065 Function The bin thermostat stops the ice machine when the bin is full. The level of ice in the ice storage bin controls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens the bin thermostat to stop the ice machine.
Page 193: Liquid Line Thermistor
LIQUID LINE THERMISTOR UDE0065 Function The liquid line thermistor senses the refrigeration system liquid line temperature. This is used in conjunction with the control board to determine the length of the freeze and harvest cycles. Specifications 10,000 Ohms +/- 2% at 25°C (77°F) Check Procedure Verify that the thermistor resistance is accurate and corresponds to the high and low temperature ranges.
Page 194 Temperature/Resistance Chart UDE0065 As the temperature rises at the thermistor block, the resistance drops. Importar If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad. Temperature of Thermistor Resistance °C °F K Ohms (x1000) 15.6 - 21.1 60 - 70 15.31 - 11.88...
Page 195: On/Off/Wash Toggle Switch
ON/OFF/WASH TOGGLE SWITCH UDE0065/UDE0080 FUNCTION The switch is used to place the ice machine in ON, OFF or WASH mode of operation. SPECIFICATIONS Single-pole, double-throw switch. The switch is connected into a varying low D.C. voltage circuit. CHECK PROCEDURE NOTE: Because of a wide variation in D.C. voltage, it is not recommended that a voltmeter be used to check toggle switch operation.
Page 196: Compressor Electrical Diagnostics
COMPRESSOR ELECTRICAL DIAGNOSTICS The compressor does not start or will trip repeatedly on overload. Check Resistance (Ohm) Values NOTE: Compressor windings can have very low ohm values. Use a properly calibrated meter. Perform the resistance test after the compressor cools. The compressor dome should be cool enough to touch (below 120°F/49°C) to ensure that the overload is closed and the resistance readings will be accurate.
Page 197 Compressor Drawing Locked Rotor The two likely causes of this are: • Defective starting component • Mechanically seized compressor To determine which you have: 1. Install high and low side gauge. 2. Try to start the compressor. 3. Watch the pressures closely. •...
Page 198: Fan Cycle Control
FAN CYCLE CONTROL UDE0080/U0140/UF0140/U0190/UF0190/U0240/ UF0240/U0310/UF0310 Function Cycles the fan motor on and off to maintain proper operating discharge pressure. The fan cycle control closes on an increase, and opens on a decrease in discharge pressure. Specifications Model Cut-In (Close) Cut-Out (Open) UDE0080 145 psig ±5 110 psig ±5...
Page 199: High Pressure Cutout (Hpco) Control
HIGH PRESSURE CUTOUT (HPCO) CONTROL UDE0080 U0140/UF0140/U0190/UF0190/U0240/ UF0240/U0310/UF0310 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 Cut-in: Automatic reset (Must be below 300 psig to reset) Check Procedure 1.
Page 200: Filter-Driers
Filter-Driers Liquid Line Filter Drier The filter-drier used on Manitowoc ice machines are manufactured to Manitowoc specifications. The difference between a Manitowoc drier and an off- the-shelf drier is in filtration. A Manitowoc drier has dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends.
Page 201: Refrigerant Recovery/Evacuation
Refrigerant Recovery/Evacuation DEFINITIONS Recover To remove refrigerant, in any condition, from a system and store it in an external container, without necessarily testing or processing it in any way. Recycle To clean refrigerant for re-use by oil separation and single or multiple passes through devices, such as replaceable core filter-driers, which reduce moisture, acidity and particulate matter.
Page 202: Refrigerant Re-Use Policy
REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’...
Page 203 4. Recovered refrigerant must come from a “contaminant-free” system. To decide whether the system is contaminant free, consider: • Type(s) of previous failure(s) • Whether the system was cleaned, evacuated and recharged properly following failure(s) • Whether the system has been contaminated by this failure •...
Page 204: Recovery And Recharging Procedures
RECOVERY AND RECHARGING PROCEDURES U0140/UF0140/U0190/UF0190/U0240/UF0240/U0310/ UF0310 Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Importar Manitowoc Ice assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
Page 205 SELF-CONTAINED RECOVERY/EVACUATION 1. Place the power button in the OFF position. 2. Install manifold gauge set, charging cylinder/scale, and recovery unit or two-stage vacuum pump. 3. Open (backseat) the high and low side ice machine service valves, and open high and low side on manifold gauge set.
Page 206 7. Close the high side on the manifold gauge set. NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs. 8. Make sure that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.
Page 207: Recovery And Recharging Procedures
RECOVERY AND RECHARGING PROCEDURES UDE0065/UDE0080 Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Importar Manitowoc Ice assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
Page 208 RECOVERY/EVACUATION 1. Place the toggle switch in the OFF position. 2. Install manifold gauge set, charging scale, and recovery unit or two-stage vacuum pump. 3. Open the high and low side valves on manifold gauge set. 4. Perform recovery or evacuation: Recovery: Operate the recovery unit as directed by the manufacturer’s instructions.
Page 209 6. Let the system “settle” for 2 to 3 minutes. 7. Place the toggle switch in the ICE position. NOTE: Manifold gauge set must be removed properly to ensure that no refrigerant contamination or loss occurs. 8. Verify that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.
Page 210: System Contamination Cleanup
System Contamination Cleanup This section describes the basic requirements for restoring contaminated systems to reliable service. Importar Manitowoc Ice 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. DETERMINING SEVERITY OF CONTAMINATION System contamination is generally caused by either moisture or residue from compressor burnout entering the...
Page 211 Contamination/Cleanup Chart Symptoms/Findings Required Cleanup Procedure No symptoms or suspicion of Normal evacuation/ contamination recharging procedure Moisture/Air Contamination symptoms Mild contamination Refrigeration system open to atmosphere cleanup procedure for longer than 15 minutes Refrigeration test kit and/or acid oil test shows contamination No burnout deposits in open compressor lines...
Page 212: Mild System Contamination Cleanup
MILD SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Replace any failed components. 2. If the compressor is good, change the oil. 3. Replace the liquid line drier. NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evaporator prior to evacuation.
Page 213: Severe System Contamination Cleanup
SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Remove the refrigerant charge. 2. Remove the compressor. 3. If burnout deposits are found, replace the TXV. 4. Wipe away any burnout deposits from suction and discharge lines at compressor. 5. Sweep through the open system with dry nitrogen. 6.
Page 214: Replacing Pressure Controls Without
REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE This procedure reduces repair time and cost. Use it when any of the following components require replacement, and the refrigeration system is operational and leak-free. • Fan cycle control • High pressure cut-out control •...
Page 215: Total System Refrigerant Charge
Total System Refrigerant Charge Importar 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. Refrigerant Model Air-Cooled Water-Cooled Type 5.8 oz UDE0065 R134A (165 g)
Page 216: Cycle Times, 24 Hr. Ice Production And Refrigerant Pressure Charts
Charts Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts These charts are used as guidelines to verify correct ice machine operation. Accurate collection of data is essential to obtain the correct diagnosis. • Production and cycle times are for dice cube - Half dice cube cycle times can be 1-2 minutes faster depending on model and ambient temperature.
Page 217: Ude0065 Operating Temperatures
UDE0065 OPERATING TEMPERATURES NOTE: These characteristics will vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 9.4-12.4 10.7-14.1 11.7-15.5 50/10 9.6-12.7...
Page 218 UDE0065 Operating Temperatures Air Temp. Freeze Cycle Harvest Cycle Entering Discharge Suction Discharge Suction Condenser Line Line Line Line °F/°C Temp °F/°C Temp °F/°C Temp °F/°C Temp °F/°C 105-120 52-12 130-140 100-115 50°F 40-50 11- -11 54-60 38-46 10°C 125-155 60- -4 145-155 115-135...
Page 219: Ude0080 Self-Contained Air-Cooled
UDE0080 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 14.6-16.5 17.6-19.9 20.3-23.0 70/21 15.5-17.5...
Page 220: Ude0080 Operating Temperatures
UDE0080 OPERATING TEMPERATURES 70°F/21°C Water Air Temp. Freeze Cycle Harvest Cycle Entering Discharge Suction Discharge Suction Condenser Line Line Line Line °F/°C Temp °F/°C Temp °F/°C Temp °F/°C Temp °F/°C 155-175 68-58 160-175 50-60 50°F 68-79 20-14 71-79 10-16 10°C 160-185 70-50 160-190...
Page 221: U0140/Uf0140 Self-Contained Air-Cooled
U0140/UF0140 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 10.2-11.7 12.4-14.1 13.0-14.8 70/21 11.2-12.8...
Page 222: U0140/Uf0140 Self-Contained Water-Cooled
U0140/UF0140 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Around Ice Time Water Temperature °F/°C Machine 50/10 70/21 90/32 °F/°C 9.8-11.2 11.2-12.8 13.0-14.8 70/21...
Page 223: U0190/Uf0190 Self-Contained Air-Cooled
U0190/UF0190 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 16.1-18.3 19.8-22.5 21.2-24.0 70/21 19.8-22.5...
Page 224: U0240/Uf0240 Self-Contained Air-Cooled
U0240/UF0240 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 14.1-16.1 17.0-19.3 18.6-21.1 70/21 15.2-17.4...
Page 225: U0240/Uf0240 Self-Contained Water-Cooled
U0240/UF0240 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Around Ice Time Water Temperature °F/°C Machine 50/10 70/21 90/32 °F/°C 16.1-18.3 17.0-19.3 18.0-20.5 70/21...
Page 226: U0310/Uf0310 Self-Contained Air-Cooled
U0310/UF0310 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Entering Time Water Temperature °F/°C Condenser 50/10 70/21 90/32 °F/°C 10.0-11.5 11.8-13.4 14.1-16.1 70/21 10.4-11.9...
Page 227: U0310/Uf0310 Self-Contained Water-Cooled
U0310/UF0310 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time Harvest Around Ice Time Water Temperature °F/°C Machine 50/10 70/21 90/32 °F/°C 11.5-13.2 11.3-12.9 12.0-13.7 70/21...
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Page 229: Wiring Diagrams
Diagrams Wiring Diagrams The following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice machine you are servicing. Warning Always disconnect power before working on electrical circuitry. Wiring Diagram Legend The following symbols are used on all of the wiring diagrams: Internal Compressor Overload (Some models have external compressor...
Page 230: Ude0065 Wiring Diagram
UDE0065 WIRING DIAGRAM 1PH Self Contained Air-cooled (L1) GRND (27) (26) (24) (25) (23) (14) (22) (21) (13) (20) (12) 040006021_00 Part Number 000014797 Rev02 05/19...
Page 231 UDE0065 Wiring Diagram 1PH Self Contained Air-cooled Number Component Bin Thermostat Compressor Compressor Overload Compressor Start Relay Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Jumper Air cooled or Drain Pump Safety Switch Water-cooled Fuse Ice Thickness Control Light Harvest On/Off/Clean Switch See Control Board Schematic For Detail Solenoid Valve Harvest...
Page 232: Ude0080 Wiring Diagram
UDE0080 WIRING DIAGRAM 1PH Self Contained Air-cooled (L1) L2 (N) GRND (22) (24) (23) (20) 19 41 (21) (10) (11) 34-1 34-2 (14) (12) (13) (15) 000001517_00 Part Number 000014797 Rev02 05/19...
Page 233 UDE0080 Wiring Diagram 1PH Self Contained Air-cooled Number Component Bin Switch Compressor Compressor Overload Compressor Start Capacitor Compressor Start Relay Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Fan Cycle Control Fuse High Pressure Cutout Ice Thickness Probe 34-1 Light Bin Switch 34-2 Light Harvest...
Page 234: U0140/U0190/U0240 Wiring Diagram
U0140/U0190/U0240 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL - 1PH AIR/WATER Self Contained Air & Water-cooled L2 (N) (10) (11) (42) WHT (30) BLU (31) BLU (37) ORG (32) BLU (2) BLU (4) YEL (3) YEL (6) RED (5) PNK (14) BRN (32) BLK (12) PRPL (34) PRPL...
Page 235 U0140/U0190/U0240 Wiring Diagram With J4 Thermistor Terminal - 1Ph Air/Water Number Component Bin Switch Compressor Compressor Overload Compressor Start Capacitor Compressor Start Relay Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Fan Cycle Control Float Switch - Harvest Float Switch-Water Level Fuse High Pressure Cutout On/Off/Clean Switch...
Page 236: U0140/U0190/U0240 Wiring Diagram
U0140/U0190/U0240 WIRING DIAGRAM PRIOR TO THERMISTOR TERMINAL - 1PH AIR/WATER Self Contained Air & Water-cooled L2 (N) (10) (42) WHT (30) BLU (31) BLU (37) ORG (32) BLK (2) BLU (3) YEL (4) YEL (6) RED (5) PNK (14) BRN (32) BLK (30) BLU (34) PRPL...
Page 237 U0140/U0190/U0240 Wiring Diagram Prior to Thermistor Terminal - 1PH Air/Water Number Component Bin Switch Compressor Compressor Overload Compressor Start Capacitor Compressor Start Relay Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Fan Cycle Control Float Switch - Harvest Float Switch-Water Level Fuse High Pressure Cutout On/Off/Clean Switch...
Page 238: U0310 Wiring Diagram With J4 Thermistor Terminal - 1Ph Air/Water
U0310 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL - 1PH AIR/WATER Self Contained Air & Water-cooled L2 (N) (10) (42) WHT (30) BLU (31) BLU (37) ORG (32) BLK (2) BLU (3) YEL (4) YEL (6) RED (5) PNK (14) BRN (32) BLK (12) PRPL (34) PRPL...
Page 239 U0310 Wiring Diagram With J4 Thermistor Terminal - 1PH Air/Water Number Component Bin Switch Compressor Compressor Overload Compressor PTCR Compressor Run capacitor Compressor Start Capacitor Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Fan Cycle Control Float Switch - Harvest Float Switch - Water Level Fuse High Pressure Cutout...
Page 240: U0310 Wiring Diagram Prior To Thermistor Terminal - 1Ph Air/Water
U0310 WIRING DIAGRAM PRIOR TO THERMISTOR TERMINAL - 1PH AIR/WATER Self Contained Air & Water-cooled L2 (N) (10) (42) WHT (30) BLU (31) BLU (37) ORG (32) BLK (2) BLU (3) YEL (4) YEL (6) RED (5) PNK (14) BRN (32) BLK (12) PRPL (34) PRPL...
Page 241 U0310 Wiring Diagram Prior To Thermistor Terminal - 1PH Air/Water Number Component Bin Switch Compressor Compressor Overload Compressor PTCR Compressor Run capacitor Compressor Start Capacitor Condenser Fan Motor Contactor Coil Contactor Contacts Control Board Fan Cycle Control Float Switch - Harvest Float Switch - Water Level Fuse High Pressure Cutout...
Page 242: Electronic Control Boards
Electronic Control Boards ELECTRONIC CONTROL BOARD UF MODELS Part Number 000014797 Rev02 05/19...
Page 243 Electronic Control Board UF Models Number Component LED Water Pump Relay LED Compressor Relay LED Water Dump Valve Relay LED Harvest Solenoid Valve LED Clean LED Thermistor LED Thermistor LED Thermistor LED Water Fill Valve LED Harvest Float LED Water Level Float LED Bin Switch LED Safety Limit 2 LED Safety Limit 1...
Page 244: Electronic Control Board U Models With J4
ELECTRONIC CONTROL BOARD U MODELS WITH J4 THERMISTOR TERMINAL Part Number 000014797 Rev02 05/19...
Page 245 Electronic Control Board U Models With J4 Thermistor Terminal Number Component LED Water Pump Relay LED Compressor Relay LED Water Dump Valve Relay LED Harvest Solenoid Valve LED Clean LED Thermistor JP1 Jumper or Thermistor Connector LED Water Fill Valve LED Harvest Float LED Water Level Float LED Bin Switch...
Page 246: Electronic Control Board U Models Prior To
ELECTRONIC CONTROL BOARD U MODELS PRIOR TO THERMISTOR TERMINAL Part Number 000014797 Rev02 05/19...
Page 247 Electronic Control Board U Models Prior To Thermistor Terminal Number Component Water Pump Relay Compressor Relay Water Dump Valve Relay Harvest Solenoid Valve Water Inlet Valve Relay Fuse LED Ice Level Float LED Test Mode LED Curtain Switch LED Safety Limit 2 LED Safety Limit 1 LED Harvest LED Water Level Float...
Page 248: Electronic Control Board Ude0065
ELECTRONIC CONTROL BOARD UDE0065 Part Number 000014797 Rev02 05/19...
Page 249 Electronic Control Board UDE0065 Number Component Liquid Line Thermistor Ice Thickness Adjustment Overflow Jumper Wire Harvest Light Fuse Control Board Transformer Part Number 000014797 Rev02 05/19...
Page 250: Electronic Control Board Ude0080
ELECTRONIC CONTROL BOARD UDE0080 Part Number 000014797 Rev02 05/19...
Page 251 Electronic Control Board UDE0080 Number Component Ice Thickness Probe Connection Ice/Off/Clean Toggle Switch Connection Bin Switch Light Harvest Light Control Board Transformer Compressor Relay Harvest Valve Relay Water Pump Relay Line Voltage Connector Fuse Part Number 000014797 Rev02 05/19...
Page 252: Tubing Schematics
Tubing Schematics TUBING SCHEMATIC - UDE0065 EVAPORATOR HEAT EXCHANGER HARVEST SOLENOID AIR OR WATER COMPRESSOR CONDENSER DRIER Part Number 000014797 Rev02 05/19...
Page 253: Tubing Schematic - Ude0080/U0140/Uf0140
TUBING SCHEMATIC - UDE0080/U0140/UF0140 EVAPORATOR HEAT EXPANSION EXCHANGER VALVE HARVEST SOLENOID STRAINER COMPRESSOR DRIER AIR OR WATER CONDENSER RECEIVER (WATER COOLED ONLY) TUBING SCHEMATIC - U0190/UF0190/U0240/UF0240/ U0310/UF0310 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HARVEST SOLENOID VALVE STRAINER COMPRESSOR DRIER AIR OR WATER CONDENSER RECEIVER (WATER COOLED ONLY)
Page 254 THIS PAGE INTENTIONALLY LEFT BLANK Part Number 000014797 Rev02 05/19...
Page 256 All of our products are backed by KitchenCare® – our aftermarket, repair, and parts service. CLEVELAND FRYMASTER® MANITOWOC® CONVOTHERM® GARLAND MERCO® DELFIELD® KOLPAK® MERRYCHEF® FITKITCHEN™ LINCOLN MULTIPLEX® ©2018 Welbilt Inc. except where explicitly stated otherwise. All rights reserved. Part Number 000014797 Rev02 05/19...

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