Page 1
Manitowoc QM20/QM30/QM45 SM50 Q130/Q170/Q210/Q270 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 America’s #1 Selling Ice Machine Part Number 80-01111-9 7/10...
Safety Notices As you work on Manitowoc equipment, be sure to pay close attention to the safety notices in this handbook. Disregarding the notices may lead to serious injury and/or damage to the equipment. Throughout this handbook, you will see the following types of safety notices: Warning Text in a W arning box alerts you to a potentia l...
Page 4
Read These Before Proceeding: ! Caution Proper inst allation, care and maintenance are essential for maxi mum performance and troubl e- free ope ration of your Manitowoc equ ipment. If you encounter pro blems n ot covere d b y this handbook, do n ot procee d, cont act Mani towoc Foodservice Grou p.
General Information Model Numbers This manual covers the following models: Self-contained Self-contained Air-cooled Water-cooled QM20A* QM30A* QM45A* SM50A QR0130A QR0131W QD0132A QD0133W QY0134A QY0135W QD0172A QY0174A QR0210A QR0211W QD0212A QD0213W QY0214A QY0215W QR0270A QR0271W QD0272A QD0273W QY0274A QY0275W *QM Models – the suffix E represents 230 volt/1 ph/50 hz machine. Warning An ice machin e con tains h igh voltage electricity and refri gerant ch arge.
BIN CASTER Replaces standard legs. MANITOWOC CLEANER AND SANITIZER Manitowoc Ice Machine Cleaner and Sanitizer are available in convenient 16 oz. (473 ml) and 1 gal (3.78 l) bottles. These are the only cleaner and sanitizer approved for use with Manitowoc products.
Page 13
) accessory cannot be used with Undercounter ice machines SM50, QM20, QM30, QM45, Q130, Q170, Q210, or Q270. QM20, QM30, QM45 ice machines do not have a water curtain covering the evaporator. Q130, Q210, Q170, Q270 have an ice damper that performs the functions of the water curtain see Ice Damper Removal/Installation for Details.
Model/Serial Number Location The model and serial numbers are required when requesting information from your local Manitowoc distributor, service representative, or Manitowoc Ice. The model and serial number are listed on the OWNER WARRANTY REGISTRATION CARD. They are also listed on the MODEL/SERIAL NUMBER DECAL affixed to the ice machine.
QM20/QM30 MODEL/SERIAL NUMBER PLATE MODEL/SERIAL NUMBER PLATE SV1599 QM45 MODEL/SERIAL NUMBER PLATE MODEL/SERIAL NUMBER PLATE SV1732 Part Number 80-01111-9 7/10...
Page 16
SM50 MODEL/SERIAL NUMBER PLATE Part Number 80-01111-9 7/10...
The following Warranty outline is provided for your convenience. For a detailed explanation, read the warranty bond shipped with each product. Contact your local Manitowoc representative or Manitowoc Ice, if you need further warranty information. Parts Q130/Q170/Q210/Q270 1. Manitowoc warrants the ice machine against...
Page 18
2. Repairs due to unauthorized modifications to the ice machine or use of non-standard parts without prior written approval from Manitowoc Ice. 3. Damage caused by improper installation of the ice machine, electrical supply, water supply or drainage, or damage caused by floods, storms, or other acts of God.
Page 19
Authorized Warranty Service To comply with the provisions of the warranty, a refrigeration service company qualified and authorized by your Manitowoc distributor, or a Contracted Service Representative must perform the warranty repair. Service Calls Normal maintenance, adjustments and cleaning as outlined in this manual are not covered by the warranty.
RESIDENTIAL WARRANTY COVERAGE What Does this Limited Warranty Cover? Subject to the exclusions and limitations below, Manitowoc Ice (“Manitowoc”) warrants to the original consumer that any new ice machine manufactured by Manitowoc (the “Product”) shall be free of defects in...
Page 21
What Is Not Covered? This limited warranty does cover, and you are solely responsible for the costs of: (1) periodic or routine maintenance, (2) repair or replacement of the Product or parts due to normal wear and tear, (3) defects or damage to the Product or parts resulting from misuse, abuse, neglect, or accidents, (4) defects or damage to the Product or parts resulting from improper or...
Page 22
Manitowoc at the address shown above. Retain a copy for your records. HOW TO OBTAIN WARRANTY SERVICE To obtain warranty service or information regarding your Product, please contact us at: MANITOWOC ICE 2110 S. 26 St., P.O. Box 1720 Manitowoc, WI 54221-1720...
Q130/Q170/Q210/Q270/QM45 must be at least 40°F (4°C) but must not exceed 110°F (43.4°C). • QM20/QM30 must be at least 50°F (10°C) but must not exceed 113°F (45°C). • SM50 must be at least 50°F (10°C) but must not exceed 110°F (43°C).
The listed values are recommended for efficient operation and servicing only. Ice Machine Heat of Rejection Heat of Rejection* Series Ice Machine Air Conditioning** Peak SM50 1145 2300 QM20 1450 2100 QM30 1600 2350 QM45 1750 2600 Q130 2100 3300...
Leveling the Ice Machine QM45/Q130/Q170/Q210/Q270 1. Screw the leveling legs onto the bottom of the ice machine. 2. Screw the foot of each leg in as far as possible. ! Caution The leg s must be screwe d in tightly to preven t them from bending.
SM50/QM20/QM30 After moving the ice machine into the installation location, it must be leveled for proper operation. Follow these steps to level the ice machine: 1. Use a level to check the levelness of the ice machine from front to back and from side to side.
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). The 115/1/60 ice machines are factory pre-wired with a 6' (1.8 m) power cord, and NEMA 5-15P-plug configuration.
Water Service/Drains WATER SUPPLY Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste. Important If yo u are inst alling a Man itowoc w ater filter system, refer to t he Installation Inst ructions supplied with the filter system for ice making water inlet connections.
COOLING TOWER APPLICATIONS Water Cooled Models Only A water-cooling tower installation does not require modification of the ice machine. The water regulator valve for the condenser continues to control the refrigeration discharge pressure. It is necessary to know the amount of heat rejected, and the pressure drop through the condenser and water valves (inlet to outlet) when using a cooling tower on an ice machine.
Page 33
WATER SUPPLY AND DRAIN LINE SIZING/ CONNECTIONS QM45/Q130/Q170/Q210/Q270 Part Number 80-01111-9 7/10...
Component Identification QM45/Q130/Q170/Q210/Q270 ICE THICKNESS PROBE DISTRIBUTION TUBE (Q210/Q270 SHOWN) EVAPORATOR (Q210/Q270 SHOWN) DAMPER WATER WATER PUMP TROUGH SV1694A FLOAT VALVE SIPHON CAP BIN SWITCH MAGNET SV1695A Evaporator Compartment Part Number 80-01111-9 7/10...
QM20/QM30 WATER DISTRIBUTION TUBE WATER PUMP BRACKET ASSEMBLY WATER PUMP OUTLET HOSE OVERFLOW EVAPORATOR TUBE ASSEMBLY WATER TROUGH SV1716A Part Number 80-01111-9 7/10...
Page 40
ON/OFF/WASH TOGGLE SWITCH SV1711 QM20 Ice Machines CONDENSER AIR FILTER ON/OFF/WASH TOGGLE SWITCH SV1681A QM30 Ice Machines Part Number 80-01111-9 7/10...
SM50 CONTROL BIN LIGHT PANEL WATER SHUTTERS EVAPORATOR COMPARTMENT THERMOSTAT WATER FILTER GRILL WATER PUMP REFRIGERATION ELECTRICAL COMPRESSOR DRAIN PUMP WATER INLET DRAIN Part Number 80-01111-9 7/10...
Page 42
WATER PUMP EVAPORATOR WATER SHUTTER ASSEMBLY WATER SUPPLY LINE SPRAY NOTE: EVAPORATOR REMOVED FOR CLARITY SPRAY NOZZLES EVAPORATOR WATER BUCKET SHUTTERS CONTROL BOARD Part Number 80-01111-9 7/10...
Maintenance Ice Machine Inspection Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbing or vibrating against other tubing, panels, etc. Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate airflow through and around the ice machine to maximize ice production and ensure long component life.
AIR-COOLED CONDENSER A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below. Warning The conde nser fi ns are sharp. Use care whe n cleaning them.
QM45/Q130/Q170/Q210/Q270 INTERIOR CLEANING AND SANITIZING General Clean and sanitize the ice machine every six months for efficient operation. If the i c e machine requires more frequent cleaning and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.
Page 46
Step 2 Remove all ice from the bin. Step 3 To start a cleaning cycle, move the toggle switch to the WASH position. Step 4 Add the proper amount of Manitowoc Ice Machine Cleaner to the water trough. Model Amount of Cleaner QM45 1.5 ounce (45 ml)
Page 47
Step 6 Remove parts for cleaning. A. Remove Two Thumbscrews and Water Pump Cover (When Used). B. Remove the Vinyl Hose Connecting the Water Pump and Water Distribution Tube C. Remove Water Pump • Disconnect the water pump power cord •...
Page 48
Ice Thickness Probe Cleaning • Mix a solution of Manitowoc ice machine cleaner and water (2 ounces of cleaner to 16 ounces of water) in a container. •...
Page 49
E. Remove the Water Distribution Tube Q170/Q210/Q270 Models 1. LIFT UP 2. SLIDE BACK 3. SLIDE TO RIGHT DISTRIBUTION THUMB TUBE SCREW THUMB SCREW SV1630 Q170/Q210/Q270 Water Distribution Tube Removal • Loosen the two thumbscrews, which secure the distribution tube. •...
Page 50
Disassembly • Twist both of the inner tube ends until the tabs line up with the keyways. • Pull the inner tube ends outward. INNER TUBE INNER TUBE KEYWAY SV1211 Q210/Q270 Water Distribution Tube Disassembly Part Number 80-01111-9 7/10...
Page 51
Q130 Models DISTRIBUTION TUBE THUMBSCREW REMOVE ICE THUMBSCREW THICKNESS PROBE SV1731C Q130 Water Distribution Tube Removal • 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 keyway.
Page 52
F. Remove the Float Valve • Turn the splash shield counterclockwise one or two turns. FLOAT VALVE BRACKET COMPRESSION FITTING SHUT-OFF VALVE CAP AND FILTER SCREEN SPLASH SHIELD FLOAT SV1695-2 FLOAT VALVE REMOVAL • Pull the float valve forward and off the mounting bracket.
Page 53
G. 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 54
H. Remove the ice damper. Q130 • 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. STEP 1 STEP 2 SV1731F Installation •...
Page 55
• Grasp ice damper and apply pressure toward the left hand mounting bracket. • Apply pressure to the right hand mounting bracket with thumb. • Pull ice damper forward when the right hand ice damper pin disengages. STEP 3 STEP 2 STEP 1 SV1742A Installation...
Page 56
I. 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 pi n s will ride up into the track slot and slide backward to the stop tab).
Page 57
Step 7 Mix a solution of cleaner and warm 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 clean all parts. Solution Water Mixed with...
Page 58
Step 13 Replace all removed components. Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position. Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough. Model Amount of Sanitizer QM45 1.5 ounces (45 ml)
Page 59
Step 18 Use 1/2 of the sanitizer/water solution to 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.
QM20/QM30 CLEANING AND SANITIZING PROCEDURE ! Caution Use only Ma nitowoc app roved Ice Machine Cleaner (p art number 94-0 546-3) Sanitizer (p art n umber 94 -0565-3). It is a violation of F ederal law to use th ese solutions in a manner inconsistent with their labeling.
Page 61
Step 3 To start a cleaning cycle, move the toggle switch to the WASH position. Step 4 Wait until water flows over the evaporator (about three minutes) then add the proper amount of Manitowoc Ice Machine Cleaner to the water trough. Model Amount of Cleaner QM20/QM30...
Page 62
Step 6 Remove parts for cleaning. A. Remove the Overflow Tube • To remove the tube, lift it up while using a slight back and forth motion to loosen it from the drain hole. When installing the tube, be sure it is completely inserted into the drain hole to prevent water leakage during normal operation.
Page 63
C. Remove the Water Pump • 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. SCREWS WATER PUMP Removing the Water Pump D.
Page 64
Step 7 Mix a solution of cleaner and warm 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 clean all parts. Solution Type Water Mixed with...
Page 65
Step 13 Replace all removed components. Step 14 Reapply power and water to the ice machine and place the toggle switch in the WASH position. Step 15 Add the proper amount of Manitowoc Ice Machine Sanitizer to the water trough. Model...
Page 66
Step 20 Use half of the sanitizer/water solution to 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 •...
SM50 CLEANING PROCEDURE SM50 uses a tin plated evaporator. Do not use standard cleaner, use only 000000084 cleaner for this ice machine. ! Caution Use onl y Manitowoc app roved Ice Ma chine Cleaner (part number 94-0546-3 original green ice machine cl eaner or 000000084 cl ear met al safe ice mach ine cleaner) and Sani tizer (p art nu mber 94-0565-3).
4. Wait until the Clean light flashes (3 minutes) then add 3 oz of Manitowoc cleaner by lifting the water shutter and pouring directly into the spray area. The ice machine will automatically time out a ten minute cleaning cycle, followed by eight rinse cycles, and stop.
3. While components are soaking, use nylon brush or cloth to sanitize the inside of ice bin. Sanitize inside of door, door gasket, bin, top of evaporator and evaporator bucket. Do not rinse sanitized components. 4. Replace all components removed. 5.
Page 70
WATER SHUTTERS The water shutter is designed to keep the spraying water from escaping the evaporator compartment. To remove just the water shutters: 1. Grasp one end of the water shutter and lift up. 2. Pivot water shutter and disengage remaining end. 3.
Page 71
ICE CHUTE The ice chute is positioned over the spray nozzles and allows the ice to easily fall into the bin. It must be firmly positioned over the spray bar, with the front edge inside the water trough. Spray nozzles must align with the spray holes or spray water will fall into the bin.
Page 72
SUMP DRAIN OVERFLOW TUBE 1. Remove clamp. 2. Pull down to remove overflow tube and tubing as an assembly. The sump trough water will drain into the bin. 3. Remove overflow tube from vinyl tubing by pulling. REMOVE CLAMP PULL DOWN Part Number 80-01111-9 7/10...
Page 73
WATER TROUGH 1. Depress tabs on right and left side of the water trough. 2. Allow front of water trough to drop as you pull forward to disengage the rear pins. Part Number 80-01111-9 7/10...
Page 74
SPRAY BAR, WATER PUMP AND HOSE Warning Disconnect the e lectric power to the ice machine at the electric service switch b ox and turn off the water supply before proceeding. Remove spray bar clamp and spray bar. 1. Grasp pump and pull straight down until water pump disengages and electrical connector is visible.
Page 75
SPRAY BAR DISASSEMBLY The spray bar supplies water to the individual ice making cups. Water from the water pump sprays through the nozzles, located on the upper portion of the tubes. 1. Grasp one end of the spray bar, lift up and remove from seat formed in evaporator bucket.
Page 76
Warning Wear ru bber gloves an d sa fety g oggles (and/or face shie ld) whe n han dling Ice Ma chine Clea ner or Sanitizer. 6. Soak the removed part(s) in a properly mixed solution. Solution Water Mixed With Type 16 oz (500 ml) Cleaner...
Removal from Service/Winterization GENERAL Special precautions must be taken if the ice machi n e is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F (0°C) or below. ! Caution If water is allowed to remain in the ice machine in freezing temperatures, severe damag e to some components could result.
WATER-COOLED ICE MACHINES 1. Perform steps 1-6 under “Self-contained Air- cooled Ice Machines” on page 77. 2. Disconnect the incoming water and drain lines from the water-cooled condenser. 3. Insert a large screwdriver between the bottom spring coils of the water regulating valve. Pry upward to open the valve.
Operation QM45/Q130/Q170/Q210/Q270 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 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. Refrigeration System Start-up The compressor starts after the 15-second pressure equalization, and remains on throughout the entire Freeze and Harvest Sequences.
HARVEST SEQUENCE 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.
ENERGIZED PARTS CHART Q130/Q170/Q210/Q270/QM45 Self-Contained Ice Machines * Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control; therefore, it may cycle on and off. Part Number 80-01111-9 7/10...
QM20/QM30 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 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.
HARVEST SEQUENCE 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.
SM50 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF Sequence of Operation Bin thermostat and the optional drain pump safety switch must be closed before the ice machine will start. Initial Start-up or Start-up After Automatic Shut-off – Water Fill Before the compressor starts, the water pump, water inlet valve and hot gas valve are energized for about 3 minutes.
Page 87
Harvest The water pump de-energizes and the water inlet valve energizes to assist harvest and refill the water sump. The hot gas valve opens and the refrigerant gas warms the evaporator allowing the cubes to release from the evaporator and drop into the storage bin. The control system automatically determines: •...
ENERGIZED PARTS CHART SM50 Self-contained Ice Machines * Liquid line thermistor determines the length of the freeze and harvest cycles. Liquid line temperature also determines fan motor operation during the harvest cycle. Part Number 80-01111-9 7/10...
Operational Checks QM45/Q130/Q170/Q210/Q270 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.
Page 90
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 91
ADJUSTING SCREW 1/8" ICE BRIDGE THICKNESS SV3114 SV3113 Ice Thickness Adjustment 2. Make sure the ice thickness probe wire and bracket does not restrict movement of the probe. Part Number 80-01111-9 7/10...
QM20/QM30 Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty. Water Inlet Valve The water inlet valve energizes in the harvest cycle. The water level will rise and flow out the overflow tube and down the drain. Verify the overflow tube is in place in the water trough.
Page 93
It is normal to have a dimple in the ice cube (a concave indentation in the cube). Ice cubes from the QM20/QM30 may appear to have a slightly larger dimple than other Manitowoc ice cube machines. Therefore, cube size...
Page 94
5. Remove the two screws holding the front panel in place and remove the front cover. 6. Locate the ice thickness control dial on the control board (see below). Turn the dial clockwise for a thicker cube or counterclockwise for a thinner cube.
SM50 Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty Water Inlet Valve The water inlet valve energizes in the harvest cycle. The water level will rise and flow out the overflow tube and down the drain. Verify the overflow tube is in place in the water trough.
Page 96
Clean (Green) Pressing the “Clean” button will initiate a clean cycle and de-energize the “Automatic Ice Making” light. The clean light will flash during the clean cycle to indicate the proper time to add ice machine cleaner or sanitizer. Replace Filter (Red) When the ice machine completes 8000 freeze/harvest cycles the light will energize to indicate the filter needs replacement.
Page 97
Cube Weight Adjustment The cube weight can be increased from the factory setting by adjusting the finish time. ADDITIONAL FINISHING TIME CHECK 1. Press and hold the power button for 5 seconds. 2. Count the flashes on the Automatic Ice Making light.
Page 98
This Page Intentionally Left Blank Part Number 80-01111-9 7/10...
Troubleshooting QM45/Q130/Q170/Q210/Q270 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals # 2 a nd # 4) at a ll times. Re moving control board fuse o r moving the tog gle switch to OFF wi ll not remove the po wer supp lied to the control board.
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 ON/OFF/WASH switch to OFF and back to ON. Wait until the water starts to flow over the evaporator.
Page 101
Step 3 Disconnect the ice thickness probe from the control board terminal. Clip the jumper wire to the terminal on the control board and any cabinet ground. Monitor the harvest light. PROBE ICE THICKNESS CONNECTION PROBE JUMPER WIRE GROUND BIN SWITCH HARVEST LIGHT EVAPORATOR LIGHT...
Page 102
Ice Machine Cycles Into Harvest Before Water Contact with the Ice Thickness Probe Step 1 Bypass the freeze time lock-in feature by moving the 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.
ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21.2°C) ambient temperature and 50°F (10.0°C) water produces more ice than the same ice machine with 90°F (32.2°C) ambient and 70°F (21.2°C) water.
INSTALLATION AND 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 •...
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.
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 107
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"...
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. Before calling for service, re-start the ice machine using the following procedure: 1.
Page 109
Safety Limits In addition to standard safety controls, 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.
Page 110
Safety Limit Notes • A safety limit indication is completed before the water pump starts. Water contacting the ice thickness probe in the freeze cycle will cause the harvest light to flash. Do not mistake a harvest light flashing in the freeze cycle with a safety limit indication.
Page 111
ANALYZING WHY SAFETY LIMITS MAY STOP THE ICE MACHINE According to the refrigeration industry, a high percentage of compressor failure is a result of external causes. These can include flooding or starving expansion valves, dirty condensers, water loss to the ice machine, etc.
Page 112
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 113
Refrigeration System • Non-Manitowoc components • Improper refrigerant charge • Defective compressor • TXV starving or flooding (check bulb mounting) • Non-condensable in refrigeration system • Plugged or restricted high side refrigerant lines or component • Defective hot gas valve Part Number 80-01111-9 7/10...
Page 114
Safety Limit #2 Harvest time exceeds 3.5 minutes for 6 Consecutive harvest cycles. Possible Cause Checklist Improper installation • Refer to “Installation and Visual Inspection Checklist” on page 104. Water System • Water area (evaporator) dirty • Dirty/defective water dump valve •...
ANALYZING DISCHARGE PRESSURE Q130/Q170/Q210/Q270 Ice Machines Only 1. Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough ______ 2. Refer to “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts”...
Page 116
Discharge Pressure High Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist” on page 104. Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan cycling control •...
ANALYZING SUCTION PRESSURE Q130/Q170/Q210/Q270 Ice Machines Only 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...
Page 118
Procedure Step 1. Determine the ice machine operating conditions. Example: Air temp. entering condenser: 90°F/32.2°C Air temp. around ice machine: 80°F/26.7°C Water temp. entering water fill valve: 70°F/21.1°C 2A. Refer to “Cycle Time” and “Operating Pressure” 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 119
Suction Pressure High Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist” on page 104. Discharge Pressure • Discharge pressure is too high, and is affecting suction pressure, refer to “Discharge Pressure High Checklist” on page 150. Improper Refrigerant Charge •...
Page 120
Suction Pressure Low Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist” on page 104. Discharge Pressure • Discharge pressure is too low, and is affecting suction pressure, refer to “Freeze Cycle Discharge Pressure Low Checklist” Improper Refrigerant Charge •...
HOT GAS VALVE General The hot gas valve is an electrically operated valve that opens when energized, and closes when de- energized. Normal Operation The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the receiver and the evaporator and performs two functions: 1.
Page 122
Hot Gas Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. VALVE WILL NOT OPEN IN THE HARVEST CYCLE Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
Page 123
Use the following procedure and table to help determine if a hot gas valve is remaining partially open during the freeze cycle. 1. Wait five minutes into the freeze cycle. 2. Feel the inlet of the hot gas valve(s). Important Feeling the hot g as valve outlet or across the hot gas valve itself will not work for this comparison.
Page 124
Findings Comments The inlet of the harvest This is normal as the valve is cool enough to discharge line should touch and the compressor always be too hot to touch discharge line is hot. and the harvest valve inlet, although too hot to touch during harvest, should be Cool &...
COMPARING EVAPORATOR INLET/OUTLET TEMPERATURES Q130/Q170/Q210/Q270 Ice Machines Only 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.
DISCHARGE LINE TEMPERATURE ANALYSIS Q130/Q170/Q210/Q270 Ice Machines Only 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.
Page 127
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...
REFRIGERATION COMPONENT DIAGNOSTIC CHART Q130/Q170/Q210/Q270 Ice Machines Only 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 129
PROCEDURE Step 1 Complete each item individually in the “Operational Analysis” column. Enter check marks (✓) in the boxes. Each time the actual findings of an item in the “Operational Analysis” column matches the published findings on the table, enter a check mark. Example: Freeze cycle suction pressure is determined to be low.
FINAL ANALYSIS The column with the highest number of check marks identifies the refrigeration problem. Column 1 – Hot Gas Valve Leaking A leaking hot gas 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.
QM20/QM30 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the co ntrol board (terminals #8 and #2 ) at all times. Removin g control board fuse or moving the toggle switch to OFF wil l not remove the powe r supplied to th e control board.
REFRIGERATION DIAGNOSTICS QM20 The QM20 ice machines have a very small refrigerant charge, 4.59 oz (130 g) and we do not recommend diagnosing the ice machine using refrigerant pressures. For this reason we have not included refrigeration access fittings. Verify that your water flow is even across the entire evaporator before diagnosing the refrigeration system.
Page 136
Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill pattern. Clean with Manitowoc Ice Machine cleaner to remove any mineral build- up before entering the refrigeration system. The following can be used for diagnostics: Capillary Tube failures or low refrigerant charge will always result in a starving evaporator.
Example: An ice formation that is “extremely thin at the outlet” could be caused by a hot water supply, water leaking water out the overflow pipe, a faulty water float valve, a low refrigerant charge, etc. INLET OUTLET QM20/QM30 Evaporator Tubing Routing Part Number 80-01111-9 7/10...
Page 138
QM20/QM30 may appear to have a slightly larger dimple than other Manitowoc ice cube machines. Therefore, cube size for the QM20/QM30 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.
QM45 ELECTRICAL The QM45 electrical sequence of Operation and troubleshooting is identical to the Q130/Q210/Q270. Refer to those models for electrical troubleshooting of: • Ice machine will not run • Diagnosing Ice Thickness Control Circuitry • Ice production check • Ice formation pattern •...
REFRIGERATION DIAGNOSTICS Important: • DO NOT install a manifold gauge set on the ice machine! Refrigerant pressures are not used to diagnose this ice machine. • If the ice machine is “slushing” remove the screen from the bottom of the water pump. •...
Page 141
3. Verify that the ice thickness probe is properly adjusted. ADJUSTING SCREW 1/8" ICE BRIDGE THICKNESS SV3114 SV3113 Ice Thickness Adjustment 4. Verify that the machine has properly sized drain line leaving the machine and that the bin drain is not restricted.
Page 142
5. Install thermometer thermocouples on Suction and Discharge line: • Digital thermometers with remote thermocouples must be used to obtain temperatures • Suction and Discharge line thermocouples must be within 3" (76.2 mm) of the compressor • Thermocouples must be insulated •...
FLOODING EXPANSION VALVE 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.
SM50 DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN Warning High (line) voltage is applied to the control board (terminals #20 an d # 21) at all times. Re moving control board fuse o r moving the tog gle switch to OFF wi ll not remove the po wer supp lied to the control board.
ICE MACHINE WILL NOT HARVEST 1. Verify cubes are present in evaporator and freeze time exceeds freeze chart cycle time. • Initial freeze cycle after resetting at toggle switch will be 5 minutes longer than chart time (refer to “Sequence of Operation” on page 86). •...
ICE QUALITY IS POOR — CUBES ARE SHALLOW, INCOMPLETE OR WHITE Ice machine is dirty • Clean and sanitize the ice machine Water filtration is poor • Replace the filter Water softener is working improperly (if applicable) • Repair the water softener Poor incoming water quality •...
FREEZE CYCLE IS LONG, LOW ICE PRODUCTION Water temperature is too high • Connect to a cold water supply, verify check valves in faucets and other equipment are functioning correctly Dirty Condenser • Clean condenser High air temperature entering condenser •...
ICE MACHINE RUNS AND NO ICE IS PRODUCED No water to ice machine • Correct water supply Incorrect incoming water pressure • Water pressure must be 20-80 psi (1.4-5.5 bar) Spray nozzle is blocked with mineral buildup • Clean and sanitize the ice machine Ambient temperature is too high or low •...
ANALYZING DISCHARGE PRESSURE 1. Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough ______ 2. Refer to “Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts” on page 203 for ice machine being checked.
DISCHARGE PRESSURE HIGH CHECKLIST Improper Installation • Refer to“Installation and Visual Inspection Checklist” on page 104. Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-circulation • Dirty condenser fins • Defective fan motor Improper Refrigerant Charge •...
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 152
Procedure Step 1. Determine the ice machine operating conditions. Example: Air temp. entering condenser: 90°F/32.2°C Air temp. around ice machine: 80°F/26.7°C Water temp. entering water fill valve: 70°F/21.1°C 2A. Refer to “Cycle Time” and “Operating Pressure” 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 153
Suction Pressure High Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist” on page 104. Discharge Pressure • Discharge pressure is too high, and is affecting suction pressure, refer to “Discharge Pressure High Checklist” on page 150. Improper Refrigerant Charge •...
Other • Non-Manitowoc components in system • Improper water supply over evaporator refer to “Water System Checklist” on page 105. • Loss of heat transfer from tubing on back side of evaporator • Restricted/plugged liquid line drier • Restricted/plugged tubing in suction side of refrigeration system NOTE: Do not limit your diagnosis to only the items listed in the checklists.
Page 155
Hot Gas Valve Analysis The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during the freeze cycle. Valve Will Not Open in the Harvest Cycle Although the circuit board has initiated a harvest cycle, the evaporator temperature remains unchanged from the freeze cycle.
Page 156
Findings Comments The inlet of the harvest This is normal as the valve is cool enough to discharge line should touch and the compressor always be too hot to touch discharge line is hot. and the harvest valve inlet, although too hot to touch during harvest, should be Cool &...
Page 157
Ice Production Check The amount of ice a machine produces directly relates to the operating water and air temperatures. This means an ice machine with a 70°F (21.2°C) ambient temperature and 50°F (10.0°C) water produces more ice than the same ice machine with 90°F (32.2°C) ambient and 70°F (21.2°C) water.
Page 158
ADJUSTING CUBE WEIGHT The cube weight can be increased from the factory setting by adjusting the finish time. ADDITIONAL FINISHING TIME CHECK Press and hold the power button for 5 seconds. • Count the flashes on the Automatic Ice Making light.
Main Fuse FUNCTION The control board fuse stops ice machine operation if electrical components fail causing high amp draw. SPECIFICATIONS • QM20/QM30 The main fuse is 250 Volt, 8 amp. • QM45/SM50/Q130/Q170/Q210/Q270 The main fuse is 250 Volt, 10 amp. Warning High (line) voltage is applied to the control b oard at all ti mes.
Bin Switch QM45/Q130/Q170/Q210/Q270 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 161
Ohm Test 1. Disconnect the bin switch wires to isolate the bin switch from the control board. 2. Connect an ohmmeter to the disconnected bin switch wires. 3. Cycle the bin switch open and closed numerous times by opening and closing the water curtain. NOTE: To prevent misdiagnosis: •...
Page 162
Bin Switch Removal — QM45/Q130 1. Disconnect power to the ice machine at service disconnect. 2. Disconnect bin switch wires in control box. 3. Depress tab on right side of evaporator with thumb. 4. Slide bin switch to right to remove. 5.
Page 163
Bin Switch Removal — Q170/Q210/Q270 1. Disconnect power to the ice machine at service disconnect. 2. Disconnect bin switch wires in control box. 3. Insert a small screwdriver through the hole located in the top of the bin switch, and depress mounting tab slightly.
Bin Thermostat QM20/QM30 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 165
1. Remove the back panel to access the bin thermostat. 2. Disconnect both wires #12 and #1 from the bin thermostat and check the resistance across the bin thermostat terminals. No Ice on Bulb Ice on Bulb Result Closed (O) Open (OL) Thermostat good Open (OL)
SM50 Function The bin thermostat stops the ice machine when the bin is full. It is preset for normal ambient temperatures and adjustments are usually not required. 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 167
Adjusting If the ice machine stops before the bin is full or runs after the bin is full, ambient temperatures are probably high or low and the bin thermostat can be adjusted as follows: Warning HAZARDOUS MOVING PARTS Power i s suppl ied to ice machi ne d uring th is procedure.
Page 168
Check Procedure Warning High (line) voltage is appl ied to the control bo ard (terminals #2 0 and #21) at al l ti mes. Remo ving the control bo ard fuse or dep ressing the power button will n ot re move the p ower supplied to the control board.
Liquid Line Thermistor QM20/QM30/SM50 Function The liquid line thermistor senses the refrigeration system liquid line temperature. This is used in conjunction with the control board to determine the length of the freeze and harvest cycles. Specifications 10,000 Ohms 2% at 25°C (77°F) ! Caution Use only Manitowoc thermistors.
Page 170
Temperature/Resistance Chart As the temperature rises at the thermistor block, the resistance drops. Important If the ohmmeter read s “OL,” check the sca le setting o n the meter before assuming the thermistor is bad. Temperature of Thermistor Resistance °C °F K Ohms (x 1000) 15.6°...
Diagnosing Start Components If the compressor attempts to start, or hums and trips the overload protector, check the start components before replacing the compressor. CAPACITOR Visual evidence of capacitor failure can include a bulged terminal end or a ruptured membrane. Do not assume a capacitor is good if no visual evidence is present.
ON/OFF/WASH Toggle Switch 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.
WASH 24-21 Closed 20-21 Open 24-20 Open 24-21 Open 20-21 Open Replace the toggle switch if ohm readings do not match all three-switch settings. QM20/QM30 Switch Setting Terminals Ohm Reading Open 7-12 Closed 12-4 Open 7-12 Open WASH Closed 12-4...
Ice Thickness Probe QM45/Q130/Q170/Q210/Q270 How The Probe Works Manitowoc’s electronic sensing circuit does not rely on refrigerant pressure, evaporator temperature, water levels or timers to produce consistent ice formation. As ice forms on the evaporator, water (not ice) contacts the ice thickness probe. After the water completes this circuit across the probe continuously for 6-10 seconds, a harvest cycle is initiated.
ICE THICKNESS CHECK The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (3.2 mm). NOTE: Make sure the water curtain is in place when performing this check. It prevents water from splashing out of the water trough. 1.
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.
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 gauges. 2. Try to start the compressor. 3. Watch the pressures closely. •...
Fan Cycle Control QM45/Q130/Q170/Q210/Q270 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 Cut-In Cut-Out Model (Close) (Open) QM45 145 psig 5 110 psig 5...
High Pressure Cutout (HPCO) Control QM45/Q130/Q170/Q210/Q270 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).
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.
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.
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 assumes no respon sibility for use of con taminated refrigerant. Da mage resulting from the...
Page 183
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 •...
Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice assumes no responsibility for the use of contaminated refrige rant. Damag e resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
Page 185
SELF-CONTAINED RECOVERY/EVACUATION 1. Place the toggle switch in the OFF position. 2. Install manifold gauges, 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 gauges.
Page 186
NOTE: Manifold gauges 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. A. Run the ice machine in freeze cycle. B.
Page 187
Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice assumes no responsibility for the use of contaminated refrige rant. Damag e resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
Page 188
Important Manifold gau ges must be re moved pro perly to ensure th at n o refri gerant con tamination or loss occurs. A quick disconnect is required for the high side connection u nless high sid e val ve ha s shut off.
Page 189
CHARGING PROCEDURES Important The cha rge i s criti cal o n a ll Man itowoc i ce machines. Use a scale to e nsure the prop er charge is installed. A quick disconnect is required for the high side connection. 1.
GENERAL This section describes the basic requirements for restoring contaminated systems to reliable service. Important Manitowoc Ice assumes no responsibility for the use of contaminated refrige rant. Damag e resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
Page 191
Contamination/Cleanup Chart Required Symptoms/Findings Cleanup Procedure No symptoms or suspicion of Normal contamination evacuation/ recharging procedure Moisture/Air Contamination symptoms Mild Refrigeration system open to contamination atmosphere for longer than 15 minutes cleanup Refrigeration test kit and/or acid oil test procedure shows contamination No burnout deposits in open compressor lines...
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.
SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Remove the refrigerant charge. 2. Remove the compressor. 3. Disassemble the hot gas solenoid valve. If burnout deposits are found inside the valve, install a rebuild kit, and replace the TXV and head pressure control valve. 4.
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 195
FIG. A - “PINCHING OFF” TUBING FIG. B - RE-ROUNDING TUBING SV1406 Using Pinch Off Tool Part Number 80-01111-9 7/10...
Q270 Condenser Fan Motor Replacement Access to remove, clean or replace the condenser fan/ motor can be obtained by performing the following: 1. Disconnect electrical power to the ice machine at the electrical service disconnect. 2. Remove the screws that secure the condenser to the cabinet and the base to the cabinet.
Brazing Procedures for Danfoss Solenoid Valves • Danfoss stainless steel solenoid valves require a slightly different brazing technique than brass- bodied valves. Copper clad stainless steel does not require as much flame contact as copper tubing. Apply heat to the copper tubing first then the solenoid socket.
Page 198
MAX. 1300°F (700°C) SV3071 4. Apply heat to copper tubing first and move flame toward valve socket. A. Heat copper tubing for approximately 10 to 15 seconds then direct the heat to the solenoid socket. B. Heat the solenoid socket for 2 to 5 seconds and apply silver solder to joint.
Component Specifications Main Fuse Volt QM20/QM30 QM45/SM50/ Q130/Q170/Q210/Q270 Bin Switch QM45/Q130/Q170/Q210/Q270 Bin switch operation is controlled by the movement of the ice damper. Bin Thermostat QM20/QM30/SM50 Control Setting Cut in: 40°F (4.5°C) Bin Thermostat Cut out: 34°F (1.0°C) ON/OFF/WASH Toggle Switch Single-pole, double-throw switch.
31 bar ±.69 Must be below 300 psig (2068 kPa, 20.68 bar) to reset. Filter-Driers Drier with dirt-retaining filtration. Liquid Line Thermistor QM20/QM30/SM50 10,000 Ohms ± 2% at 25°C (77°F) ! Caution Use only Manitowoc thermistors. Part Number 80-01111-9 7/10...
Se rial p late in formation overrid es information listed on this page. Air- Water- Refrigerant Model Cooled Cooled Type 4.6 oz QM20 R134A (130 g) 5.8 oz QM30 R134A (165 g) 8 oz QM45 R134A (227 g)
Page 202
This Page Intentionally Left Blank Part Number 80-01111-9 7/10...
Charts Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts These charts are used as guidelines to verify correct ice machine operation. Accurate collection of data is essential to obtain the correct diagnosis. • Refer to “Operational Analysis Chart” for the list of data that must be collected for refrigeration diagnostics.
QM20 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Air Temp. Freeze Time...
QM30 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C...
QM45 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: The first cycle, at any temperature, will take up to three minutes longer. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C...
SM50 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 15.6-17.8 15.3-17.4 15.6-17.8 70/21 16.6-18.9...
Q130 SELF-CONTAINED AIR-COOLED (Before Serial Number 310047287) NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32...
Q130 SELF-CONTAINED AIR-COOLED (After Serial Number 310047287) NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 10.2-12.4...
Q130 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Around Ice Harvest Water Temperature °F/°C Machine Time °F/°C 50/10 70/21 90/32 10.2-12.4 12.3-14.8 14.3-17.2 70/21...
Q170 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. NOTE: Data is preliminary. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 17.6-20-1...
Q210 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 14.8-16.9 17.5-19.9 19.8-22.5 70/21 16.1-18.3...
Q210 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Freeze Time Air Temp. Harvest Around Ice Water Temperature °F/°C Time Machine °F/°C 50/10 70/21 90/32 14.5-16.5 15.6-17.8 19.2-21.8 70/21 14.8-16.9...
Q270 SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Entering Harvest Water Temperature °F/°C Condenser Time °F/°C 50/10 70/21 90/32 11.0-12.6 12.8-14.7 14.5-16.5 70/21 11.3-12.9...
Q270 SELF-CONTAINED WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Total Cycle Time Freeze Time Air Temp. Around Ice Harvest Water Temperature °F/°C Machine Time °F/°C 50/10 70/21 90/32 10.6-12.2 12.3-14.0 13.5-15.4 70/21...
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 di sconnect po wer before w orking o n electrical circuitry. Wiring Diagram Legend The following symbols are used on all of the wiring diagrams: Internal Compressor Overload...
QM20 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L2 (N) COMPRESSOR OVERLOAD (24) PROTECTOR THERMISTOR STARTING DEVICE ICE THICKNESS (23) ADJUSTMENT FAN MOTOR CONTROL DIAL (AIR COOLED ONLY)
QM30 115V/1 Ph/60 Hz CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. (27) (26) COMPRESSOR COMPRESSOR OVERLOAD (24) RELAY CONTACTS PROTECTOR THERMISTOR STARTING DEVICE (25) CONTROL FAN MOTOR BOARD COMPRESSOR (AIR COOLED ONLY) RELAY COIL OVERFLOW 1 (23)
QM30 230V/1 Ph/50 Hz CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L2 (N) COMPRESSOR OVERLOAD (24) PROTECTOR THERMISTOR STARTING DEVICE ICE THICKNESS (23) ADJUSTMENT FAN MOTOR CONTROL DIAL (AIR COOLED ONLY) BOARD...
QM45 CAUTION: DISCONNECT POWER BEFORE L2 (N) WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. (22) (24) THICKNESS PROBE BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (10) (21) SWITCH LIGHT (11) HARVEST LIGHT...
SM50 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. START CAPACITOR COMPRESSOR (23) (32) (33) START RELAY CONTROL BOARD (24) (20) TRANS. DRAIN FUSE (7A) PUMP (25) HOT GAS SOLENOID (26) (47) (29) (48) FAN MOTOR (42)
Q130/Q210 Tecumseh Compressor L2 (N) NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) ICE THICKNESS (24) PROBE BIN SWITCH (23) WASH TOGGLE SWITCH (20) CONTROL BOARD (21) (10) SWITCH (11) LIGHT HARVEST LIGHT CONTACTOR COIL HOT GAS SOLENOID FUSE...
Q130/Q170/Q210 Danfoss Compressor NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) (22) ICE THICKNESS (24) PROBE BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (21) (10) SWITCH (11) LIGHT HARVEST LIGHT RELAY COIL HOT GAS SOLENOID FUSE...
Q270 Tecumseh Compressor CAUTION: DISCONNECT POWER BEFORE L2 (N) WORKING ON ELECTRICAL CIRCUITRY. DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) THICKNESS (24) PROBE BIN SWITCH (23) WASH TOGGLE SWITCH CONTROL (20) BOARD (21) (10) SWITCH LIGHT CONTACTOR COIL (16)
Q270 Danfoss Compressor NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) TOGGLE SWITCH (22) (24) ICE THICKNESS PROBE BIN SWITCH WASH (23) (20) CONTROL BOARD (21) (11) SWITCH LIGHT (10) (GREEN) HARVEST LIGHT (RED) RELAY HOT GAS SOLENOID...
Electronic Control Boards QM20/QM30 ICE BRIDGE LIQUID LINE THICKNESS THERMISTOR CONTROL CONNECTION POWER LIGHT 8 AMP FUSE Part Number 80-01111-9 7/10...
Page 228
QM45/Q130/Q170/Q210/Q270 DC LOW VOLTAGE ICE THICKNESS ELECTRICAL PLUG PROBE BIN SWITCH LIGHT HARVEST LIGHT AC LINE VOLTAGE ELECTRICAL PLUG 10 AMP FUSE Part Number 80-01111-9 7/10...
Page 229
SM50 FUSE (7A) TRANSFORMER THERMISTOR BIN LIGHT CONNECTION DISPLAY BOARD CONNECTION BIN THERMOSTAT BIN LIGHT CONNECTION SWITCH Part Number 80-01111-9 7/10...
Tubing Schematics QM20/QM30 Tubing Schematic EVAPORATOR HEAT EXCHANGER CAP TUBE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER DRIER SV3022 Part Number 80-01111-9 7/10...
Page 231
QM45/Q130 Tubing Schematic EVAPORATOR HEAT EXPANSION EXCHANGER VALVE HOT GAS SOLENOID COMPRESSOR AIR OR WATER CONDENSER STRAINER DRIER RECEIVER (Q130 WATER COOLED ONLY) SV3024 Part Number 80-01111-9 7/10...
Page 232
SM50 Tubing Schematic HEAT EVAPORATOR EXCHANGER CAP TUBE HOT GAS SOLENOID VALVE COMPRESSOR CONDENSER DRIER Part Number 80-01111-9 7/10...
Page 233
Q170/Q210/Q270 Tubing Schematic EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE AIR OR COMPRESSOR WATER CONDENSER STRAINER DRIER COMPRESSOR RECEIVER (WATER COOLED ONLY) SV3023 Part Number 80-01111-9 7/10...
Page 234
This Page Intentionally Left Blank Part Number 80-01111-9 7/10...
Need help?
Do you have a question about the QM20 and is the answer not in the manual?
Questions and answers