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.
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 personal inju ry situation. Be sure to re ad th e Warning st atement be fore procee ding, an d work carefully.
Read These Before Proceeding: ! Caution Proper inst allation, care and maintenance are essential for maxi mum performance and troubl efree 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. We w ill b e hap py to provid e assistance. Important Routine a djustments an d mai ntenance procedures ou tlined in this h andbook a re not covered by the warranty.
Table of Contents GENERAL INFORMATION Model Numbers . . . . . . . . . . . . . . . . . . . . . 11 How to Read a Model Number . . . . . . . . . 12 Accessories . . . . . . . . . . . . . . . . . . . . . . . 12 Bin Caster . . . . . . . . . . . . . . . . . . . . . . 12 Manitowoc Cleaner and Sanitizer . . . . 12 Model/Serial Number Location . . . . . . . . 14 Q130/Q170/Q210/Q270 . . . . . . . . . . . 14 QM20/QM30 . . . . . . . . . . . . . . . . . . . . 15 QM45 . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Condenser . . . . . . . . . . . . . Air-cooled Condenser . . . . . . . . . . . . . Water-cooled Condenser and Water Regulating Valve . . . . . . . . . . . QM45/Q130/Q170/Q210/Q270 . . . . . . . . . Interior Cleaning and Sanitizing . . . . . QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . Cleaning and Sanitizing Procedure . . SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cleaning Procedure . . . . . . . . . . . . . . Sanitizing Procedure . . . . . . . . . . . . .
TROUBLESHOOTING QM45/Q130/Q170/Q210/Q270 . . . . . . . . . 99 Diagnosing an Ice Machine that Will Not Run . . . . . . . . . . . . . . . . . 99 Diagnosing Ice Thickness Control Circuitry . . . . . . . . . . . . . . . . . . . . . . . . 100 Ice Production Check . . . . . . . . . . . . . 103 Installation and Visual Inspection Checklist . . . . . . . . . . . . . . . . . . . . . . . 104 Water System Checklist . . . . . . . . . . . 105 Ice Formation Pattern . . . . . . . . . . . . . 106 Safety Limit Feature .
Freeze Cycle Is Long, Low Ice Production . . . . . . . . . . . . . . . . . . . . . 147 Ice Machine Runs and No Ice Is Produced . . . . . . . . . . . . . . . . . . . . 148 Analyzing Discharge Pressure . . . . . . 149 Discharge Pressure High Checklist . . 150 Freeze Cycle Discharge Pressure Low Checklist . . . . . . . . . . . . . . . . . . . . . . . 150 Analyzing Suction Pressure . . . . . . . . 151 Hot Gas Valve . . . . . . . . . . . . . . . . . . 154 COMPONENT CHECK PROCEDURES Main Fuse . . . . . . . .
High Pressure Cutout (HPCO) Control . . 179 QM45/Q130/Q170/Q210/Q270 . . . . . . 179 Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . 180 Liquid Line Filter Drier . . . . . . . . . . . . . 180 Refrigerant Recovery/Evacuation . . . . . . 181 Definitions . . . . . . . . . . . . . . . . . . . . . . 181 Refrigerant Re-use Policy . . . . . . . . . . 182 Recovery and Recharging . . . . . . . . . . 184 System Contamination Cleanup . . . . . . . 190 General . . . . . . . . . . . . . . . . . . . . . . .
CHARTS Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts . . . . . . . . . . QM20 Self-contained Air-cooled . . . . . QM30 Self-contained Air-cooled . . . . . QM45 Self-contained Air-cooled . . . . . QM45 Operating Temperatures . . . . . SM50 Self-contained Air-cooled . . . . . Q130 Self-contained Air-cooled (Before Serial Number 310047287) . . Q130 Self-contained Air-cooled (After Serial Number 310047287) . . . . Q130 Self-contained Water-cooled . . Q170 Self-contained Air-cooled . . .
General Information Model Numbers This manual covers the following models: Self-contained Air-cooled Self-contained Water-cooled QM20A* N/A QM30A* N/A QM45A* N/A SM50A N/A QR0130A QR0131W QD0132A QD0133W QY0134A QY0135W QD0172A N/A QY0174A N/A 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.
How to Read a Model Number Cube Size Capacity Condenser Type Series Q R 0130 A A - Air-cooled W - Water-cooled R - Regular D - Dice Y - Half-dice 0 - Regular, Air-cooled 1 - Regular, Water-cooled 2 - Dice, Air-cooled 3 - Dice, Water-cooled 4 - Half-dice, Air-cooled 5 - Half-dice, Water-cooled Accessories Contact your Manitowoc distributor for these optional accessories: BIN CASTER Replaces standard legs.
! Caution Use only Ma nitowoc app roved Ice Machine Cleaner (part nu mber 9 4-0546-3 original gre en ice machin e cleaner or 000 000084 clea r met al safe ice ma chine clea ner) a nd San itizer (p art number 94-0565-3). It is a viola tion of Federal law to use th ese so lutions in a manner inconsistent with thei r l abeling. Re ad a nd understand all lab els printed on bottles before use.
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 15
SM50 MODEL/SERIAL NUMBER PLATE 16 Part Number 80-01111-9 7/10
Ice Machine Warranty Information OWNER WARRANTY REGISTRATION CARD General Warranty coverage begins the day the ice machine is installed. Important Complete and mail the OWNER W ARRANTYREGISTRATION C ARD as soo n as p ossible to validate the installation date. If the OWNER WARRANTY REGISTRATION CARD is not returned, Manitowoc will use the date of sale to the Manitowoc Distributor as the first day of warranty coverage for your new ice machine.
Labor Q130/Q170/Q210/Q270 1. Labor required to repair or replace defective components is covered for three (3) years from the date of original installation. 2. The evaporator is covered by an additional two(2) year (five years total) labor warranty beginning on the date of the original installation (Q130/ Q170/Q210/Q270 only). SM50/QM20/QM30/QM45 1. Labor required to repair or replace defective components is covered for three (3) years from the date of original installation.
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 material or workmanship for the warranty period outlined below under normal use and maintenance, and upon proper installation and start-up in accordance with the instruction manual supplied with the Product.
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 unauthorized alterations, modifications, or changes; and (5) defects or damage to any Product that has not been installe
How State Law Applies This limited warranty gives you specific legal rights, and you may also have rights that vary from state to state or from one jurisdiction to another. Registration Card To secure prompt and continuing warranty service, this warranty registration card must be completed and sent to Manitowoc within thirty (30) days from the sale date. Complete the following registration card and send it to Manitowoc at the address shown above. Retain a copy for your records.
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. • Air temperature: • 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).
Ice Machine Clearance Requirements Self-contained Air-cooled Self-contained Water-cooled Top/Sides 5" (127 mm)* 5" (127 mm)* Back 5" (127 mm)* 5" (127 mm)* *NOTE: The ice machine may be built into a cabinet. There is no minimum clearance requirement for the top or left and right sides of the ice machine. The listed values are recommended for efficient operation and servicing only.
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. 3. Move the ice machine into its final position. 4. Level the ice machine to ensure that the siphon system functions correctly. Use a level on top of the ice machine. Turn each foot as necessary to level the ice machine from front to back and side to side.
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. 2. If the ice machine is not level, adjust the leveling glides or legs on each corner of the base of the ice machine as necessary. 3. Check the levelness of the ice machine after each adjustment. 4.
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. The 208-230/1/60 and 230/1/50 ice machines are factory pre-wired with a power cord only, no plug is supplied. FUSE/CIRCUIT BREAKER A separate fuse/circuit breaker must be provided for each ice machine.
Electrical Specifications Q130/Q170/Q210/Q270 Air-cooled Ice Machine Ice Machine Voltage Phase Cycle Max. Fuse/ Circuit Breaker Total Amps Q130 (Before Serial Number 310047287) 115/1/60 15 amp 7.6 208-230/1/60 15 amp 3.3 230/1/50 15 amp 3.3 Q130 (After Serial Number 310047287) 115/1/60 15 amp 7.0 208/1/60 15 amp 3.1 230/1/50 15 amp 3.0 Q170 115/1/60 15 amp 7.0 115/1/60 15 amp 6.5 208-230/1/60 15 amp 3.6 230/1/50 15 amp 3.
Q130/Q210/Q270 Water-cooled Ice Machine Ice Machine Voltage Phase Cycle Max. Fuse/ Circuit Breaker Total Amps Q130 (Before Serial Number 310047287) 115/1/60 15 amp 6.8 208-230/1/60 15 amp 2.8 230/1/50 15 amp 2.8 Q130 (After Serial Number 310047287) 115/1/60 15 amp 6.3 208/1/60 15 amp 2.6 Q210 Q270 Danfoss Q270 Tecumseh 230/1/50 15 amp 2.5 115/1/60 15 amp 6.1 208-230/1/60 15 amp 3.1 230/1/50 15 amp 3.1 115/1/60 15 amp 9.9 208-230/1/60 15 amp 4.7 230/1/50 15 amp 4.
QM20/QM30/QM45 Air-cooled Ice Machine Ice Machine QM20 QM30 QM45 Voltage Phase Cycle Max. Fuse/ Circuit Breaker Total Amps 115/1/60 15 amp 3.5 230/1/50 15 amp 1.5 115/1/60 15 amp 5.3 230/1/50 15 amp 2.6 115/1/60 15 amp 5.2 230/1/50 15 amp 2.6 SM50 Air-cooled Ice Machine Ice Machine Voltage Phase Cycle Max. Fuse/ Circuit Breaker Total Amps SM50 115/1/60 15 amp 4.
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. WATER INLET LINES Follow these guidelines to install water inlet lines: • Do not connect the ice machine to a hot water supply.
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. • Water entering the condenser must not exceed 90°F (32.2°C).
Water Pressure 20 psi (1.38 bar) min. 80 psi (5.5 bar) max. 20 psi (1.38 bar) min. 150 psi (10.3 bar) max. — — Water Temperature 33°F (0.6°C) min. 90°F (32.2°C) max. 33°F (0.6°C) min. 90°F (32.2°C) max. — — Location Ice Making Water Inlet Condenser Water Inlet Condenser Water Drain Bin Drain 3/8" (9.5 mm) min. inside diameter 3/8" (9.5 mm) min. inside diameter 1/2" (12.7 mm) min. inside diameter 3/8" Female Pipe Thread 1/2" Female Pipe Thread 3/8" (9.5 mm) min.
Tubing Size Up to Ice Machine Fitting 3/8" (.95 cm) min. inside diameter 5/8" (1.59 cm) min. inside diameter Ice Machine Fitting 3/4" Male Connection 5/8" (1.59 cm) inside diameter flexible hose Water Pressure 34.8 psi (2.4 bar) min. 89.9 psi (6.2 bar) max. — Water Temperature 50°F (10°C) min. 86°F (30°C) max.
Part Number 80-01111-9 7/10 20 psi (1.38 bar) min. 80 psi (5.5 bar) max. — — 50°F (10°C) min. 90°F (32.2°C) max. — — Ice Making Water Inlet Bin Drain Drain Pump Tubing Size Up to Ice Machine Fitting 1/4" (.64 cm) min. inside diameter 3/4" (1.9 cm) min. inside diameter 3/8" (.96 cm) min. inside diameter Ice Machine Fitting 1/4" (.64 cm) ID Copper Tubing 3/4" (1.9 cm) Hose Barb 3/8" (.96 cm) Hose Note: If air temperature is less than 60°F (15.
This Page Intentionally Left Blank 36 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) ICE DAMPER WATER TROUGH WATER PUMP SV1694A FLOAT VALVE SIPHON CAP BIN SWITCH MAGNET SV1695A Evaporator Compartment Part Number 80-01111-9 7/10 37
ON/OFF/WASH TOGGLE SWITCH CONDENSER AIR FILTER COMPRESSOR COMPARTMENT ACCESS SCREWS SV1686G QM45/Q130/Q170/Q210 Ice Machines ON/OFF/WASH TOGGLE SWITCH COMPRESSOR COMPARTMENT ACCESS SCREWS CONDENSER AIR FILTER PT1288 Q270 Ice Machines 38 Part Number 80-01111-9 7/10
QM20/QM30 WATER DISTRIBUTION TUBE WATER PUMP AND BRACKET ASSEMBLY WATER PUMP OUTLET HOSE OVERFLOW TUBE EVAPORATOR ASSEMBLY WATER TROUGH Part Number 80-01111-9 7/10 SV1716A 39
ON/OFF/WASH TOGGLE SWITCH SV1711 QM20 Ice Machines CONDENSER AIR FILTER ON/OFF/WASH TOGGLE SWITCH SV1681A QM30 Ice Machines 40 Part Number 80-01111-9 7/10
SM50 CONTROL PANEL BIN LIGHT WATER SHUTTERS EVAPORATOR COMPARTMENT WATER FILTER BIN BIN THERMOSTAT GRILL WATER PUMP ELECTRICAL DRAIN PUMP REFRIGERATION COMPRESSOR WATER INLET DRAIN Part Number 80-01111-9 7/10 41
WATER PUMP EVAPORATOR WATER SHUTTER ASSEMBLY WATER SUPPLY LINE NOTE: EVAPORATOR REMOVED FOR CLARITY EVAPORATOR BUCKET SPRAY BAR SPRAY NOZZLES WATER SHUTTERS CONTROL BOARD 42 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. Exterior Cleaning Clean the area around the ice machine as often as necessary to maintain cleanliness and efficient operation.
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. 1. The washable aluminum filter on self-contained aircooled ice machines is designed to catch dust, dirt, lint and grease. This helps keep the condenser clean.
QM45/Q130/Q170/Q210/Q270 INTERIOR CLEANING AND SANITIZING General Clean and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent cleaning and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment. The ice machine must be taken apart for cleaning and sanitizing. ! Caution Use only Ma nitowoc app roved Ice Machine Cleaner (p art number 94-0 546-3) and Sanitizer (p art n umber 94 -0565-3).
Step 1 Set the toggle switch to the OFF position after ice falls from the evaporator at the end of a Harvest cycle. Or, set the switch to the OFF position and allow the ice to melt off the evaporator. ! Caution Never use a nything to force ice fro m the evaporator. Damage may result. 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.
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 • Loosen the screws securing the pumpmounting bracket to the bulkhead • Lift the pump and bracket assembly off the mounting screws.
• D. Remove the Ice Thickness Probe Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket. ICE THICKNESS PROBE COMPRESS SIDES OF ICE THICKNESS PROBE SV1138A Ice Thickness Probe Removal NOTE: At this point, the ice thickness probe can easily be cleaned. If complete removal is desired follow the ice thickness probe wire to the bulkhead grommet (exit point) in the back wall.
E. Remove the Water Distribution Tube Q170/Q210/Q270 Models 1. LIFT UP 2. SLIDE BACK 3. SLIDE TO RIGHT 2 3 1 DISTRIBUTION TUBE THUMB SCREW THUMB SCREW SV1630 Q170/Q210/Q270 Water Distribution Tube Removal • • Loosen the two thumbscrews, which secure the distribution tube. Lift the right side of the distribution tube up off the locating pin, then slide it back and to the right. ! Caution Do not force this removal.
Disassembly • Twist both of the inner tube ends until the tabs line up with the keyways. • Pull the inner tube ends outward.
Q130 Models DISTRIBUTION TUBE THUMBSCREW THUMBSCREW REMOVE ICE 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. • Pull the inner tube end outward.
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 • • • 52 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 cleaning.
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. Remove the water trough from the bin area.
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 lefthand mounting pin disengages. STEP 1 STEP 2 SV1731F Installation • Grasp the right side of ice damper and place left hand pin in the mounting bracket. • While applying pressure against the left-hand mounting bracket push the damper until the right-hand mounting pin engages.
• 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 • Place ice damper pin in left hand mounting bracket and apply pressure toward the left hand mounting bracket. • Apply pressure to the right hand mounting bracket with thumb.
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 pins will ride up into the track slot and slide backward to the stop tab). While applying pressure against the bin door pull down on the rear of each bin door track until the door pins clear the stop tabs. Slide the rear door pins off the end and then below the door track.
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 Cleaner 1 gal. (4 l) 16 oz (500 ml) cleaner Step 8 Use ½ of the cleaner/water solution to clean all components.
Step 12 Use 1/2 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 • Bin bottom, sides and top Do not rinse the sanitized areas. 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 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. Step 19 Use 1/2 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.
QM20/QM30 CLEANING AND SANITIZING PROCEDURE ! Caution Use only Ma nitowoc app roved Ice Machine Cleaner (p art number 94-0 546-3) and 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. Read and unde rstand all lab els printed on bottles before use. ! Caution Do n ot mix Ice Machi ne Cleaner an d Sanitizer solutions toge ther.
Step 1 Set the toggle switch to the OFF position after ice falls from the evaporator at the end of a Harvest cycle. Or, set the switch to the OFF position and allow the ice to melt off the evaporator. ! Caution Never use anything to force ice evaporator. Damage may result. from th e Step 2 Remove all ice from the bin. Step 3 To start a cleaning cycle, move the toggle switch to the WASH position.
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. DRAIN HOLE OVERFLOW TUBE Removing the Overflow Tube • 62 B. Remove the Vinyl Hose Disconnect the water pump discharge hose from the distribution tube and water pump.
• • • 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. Remove the Water Trough Remove the screws holding the water trough to the walls of the cabinet.
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 Cleaner Water Mixed with 4L. (1 gal) 500 ml (16 oz) cleaner Step 8 Use half of the cleaner/water solution to clean all components.
Step 12 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 • Bin bottom, sides and top Do not rinse the sanitized areas. 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 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 • Bin bottom, sides and top Do not rinse the sanitized areas. Step 21 Replace all removed components. Step 22 Reapply power and water to the ice machine and place the toggle switch in the ICE position.
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). It is a viola tion of Fed eral law to use these solutions in a manner inconsistent with their labeling.
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. The Clean light will turn off to indicate the Clean cycle is complete. This entire cycle lasts approximately 30 minutes. 5. When the cleaning process stops, remove all parts as described in Removal of Parts for Cleaning and Sanitizing. 6.
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. To start a sanitizing cycle, press the CLEAN switch. The Clean light will energize to indicate the sanitizing cycle has started. 6. Wait until the Clean light flashes (3 minutes) then add 0.
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. To re-install into ice machine, grasp one end of the water shutters, install one end, pivot the opposite end and pull down into position. Make sure tabs are secure in grooves. To remove water shutter assembly: 1.
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. 1. Grab protruding spray hole on one end and lift up and remove. 2. To re-install ice chute, grasp protruding spray hole and position over Water Distribution Assembly.
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.
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.
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. 2. Disconnect the electrical connector. 3. Remove the water pump from ice machine. 4. Remove clamp from hose to remove from pump. 5. Do not submerse the water pumpmotor in cleaner or sanitizer.
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. 2. Remove clamp on water inlet tubing by grasping both ears on clip and separating. 3. Apply food grade lubricant to ease re-assembly of spray bar components when necessary. 4.
! 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 Type Water Mixed With Cleaner 1 gal (4 l) 16 oz (500 ml) cleaner Sanitizer 6 gal (23 l) 4 oz (120 ml) sanitizer 7. Use a soft-bristle brush or sponge (NOT a wire brush) to carefully clean the parts. ! Warning Do not mi x Cleaner and Sanitizer solu tions together.
Removal from Service/Winterization GENERAL Special precautions must be taken if the ice machine is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F (0°C) or below. ! Caution If water is allowed to remain in the ice machine in freezing temperatures, severe damag e to some components could result. Damage of this nature is not covered by the warranty. Follow the applicable procedure below. SELF-CONTAINED AIR-COOLED ICE MACHINES 1.
WATER-COOLED ICE MACHINES 1. Perform steps 1-6 under “Self-contained Aircooled 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. SV1624 Pry Open the Water Regulating Valve 4. Hold the valve open and blow compressed air through the condenser until no water remains.
Operation QM45/Q130/Q170/Q210/Q270 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.
HARVEST SEQUENCE 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. The sliding sheet of cubes contacts the ice damper, opening the bin switch.
Part Number 80-01111-9 7/10 4. Freeze 3. Pre chill Freeze Sequence 2. Refrigeration System Start-up 1. Water purge Initial Start-up ICE MAKING SEQUENCE OF OPERATION off off on on off off on Hot Gas Valve Water Pump off 2 1 3 on on on off Relay Coil Control Board Relays on on on off Compressor 3A 3B on on on off Compressor Fan Motor* Relay Until 7 sec.
Part Number 80-01111-9 7/10 6. Auto Shut-off Automatic Shut-off 5.
QM20/QM30 INITIAL START-UP OR START-UP 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. 2. Refrigeration System Start-up The compressor starts 2.9 minutes (175 seconds) after the water fill valve and hot gas valve are energized.
HARVEST SEQUENCE 4. Harvest Cycle The condenser fan motor and water pump deenergize. 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. The hot refrigerant gas warms the evaporator, causing the cubes to slide, as a sheet, off the evaporator and into the ice storage bin.
on off on off on on off 3. Freeze Cycle 4. Harvest Cycle 5. Auto-shut-off on Part Number 80-01111-9 7/10 off off on off off 3 Water Pump Fan Motor 2 Hot Gas Valve Water Fill Valve on off Compressor 1 Control Board Relays 2. Refrigeration System Start-up 1. Water purge Initial Start-up ICE MAKING SEQUENCE OF OPERATION Until bin thermostat re-closes Automatically determined Automatically determined 5 seconds 2.
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. 1. 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. 2. Refrigeration System Start-up The compressor starts after the water fill, and remains on throughout the Freeze and Harvest cycles.
4. 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.
on off off off Harvest Automatic Shutoff on off on Refrigeration System Start-up on on on Initial Start-up/ Start-up after Automatic Shutoff Water Inlet Valve (2) Freeze Cycle Water Pump (1) SEQUENCE (Relay) off on off on on Harvest Valve (3) off on on on off Compressor (4) Until bin thermostat Re-closes Automatically determined* on or off off Automatically determined* 5 seconds 175 seconds Duration on on off Fan Motor (5) ENERGIZED PARTS CHART SM50 Self-contain
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. The siphon action stops when the water level in the sump trough drops. When the siphon action stops, the float valve refills the water trough to the correct level.
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. 4. Adjust the water level to [1/4" to 3/8" (6.3 to 9.5 mm) below the standpipe] the line in the water trough: A. Loosen the two screws on the float valve bracket. B.
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.
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. The water level is not adjustable.
Ice Thickness Check QM20/QM30 dice ice cube formation is slightly different from our previous models. Manitowoc ice machines have a unique cube shape. 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 for the QM20/QM30 is determined by measuring the slab weight (the combined weight of all cubes from one harvest cycle).
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. ICE THICKNESS ADJUSTMENT DIAL DIAL IS FACTORY SET TO ZERO SV1710 Ice Thickness Adjustment Dial 7. Ensure all of the panels and air filter are reinstalled properly and the bin door is closed. Repeat steps 1 – 3.
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. The water level is not adjustable. Bin Thermostat Adjustment The bin thermostat stops the ice machine when the bin is full.
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. Depressing the “Clean” button for 6 seconds will reset the counter and de-energize the light.
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. The light will flash once for each additional minute of freeze cycle time. ADJUSTING FINISHING TIME Adjust in 1 minute increments and allow the ice machine to run several freeze/harvest cycles, then inspect the ice cubes.
This Page Intentionally Left Blank 98 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. 1. Verify primary voltage is supplied to ice machine and the fuse/circuit breaker is closed. 2. Verify control board fuse is okay. 3. If the bin switch light functions, the fuse is okay. 4.
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. Step 2 Clip the jumper wire to the ice thickness probe and any cabinet ground.
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. ICE THICKNESS PROBE PROBE CONNECTION JUMPER WIRE GROUND EVAPORATOR BIN SWITCH HARVEST LIGHT LIGHT (RED) (GREEN) SV1592J Step 3 Jumper wire connected from control board terminal to ground Monitoring Harvest Light Correction The harvest light comes on, and 6-10 seconds later, ice machine cycles from freeze to harvest.
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. Step 2 Disconnect the ice thickness probe from the control board terminal. ICE THICKNESS PROBE DISCONNECT PROBE WIRE BIN SWITCH LIGHT (GREEN) HARVEST LIGHT (RED) SV1592J_2 Step 2 Disconnect probe from control board terminal.
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. 1. Determine the ice machine operating conditions: Air temp entering condenser: ____° Air temp around ice machine: ____° Water temp entering sump trough: ____° 2.
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 • Run and vent drains according to the Installation Manual 104 Part Number 80-01111-9 7/10
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. Any number of problems can cause improper ice formation.
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" to 1" of ice formation. Possible cause: Water loss, low on refrigerant, starving TXV, hot water supply, faulty float valve, etc.
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. Move the ON/OFF/WASH switch to OFF and then back to ON. 2. If the safety limit feature has stopped the ice machine, it will restart after a short delay. Proceed to step 4. 3.
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. 3 cycles outside the time limit = 1 hour Stand-by Mode. Safety Limit #2: If the harvest time reaches 3.5 minutes, the control board automatically returns the ice machine to the freeze cycle.
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. • A continuous run of 100 harvests automatically erases the safety limit code. • The control board will store and indicate only one safety limit – the last one exceeded.
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. The safety limits protect the ice machine (primarily the compressor) from external failures by stopping ice machine operation before major component damage occurs. The safety limit system is similar to a high-pressure cutout control.
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.
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 7/10 113
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 • Vent tube not installed on water outlet drain • Water freezing behind evaporator • Plastic extrusions and gaskets not securely mounted to the evaporator • Low water pressure (20 psig min.
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” on page 203 for ice machine being checked. Use the operating conditions determined in step 1 to find the published normal discharge pressures. Freeze Cycle ______ Harvest Cycle ______ 3.
Discharge Pressure High Checklist Improper Installation • Refer to “Installation and Visual Inspection Checklist” on page 104.
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 cycle time.
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. Example: Published freeze cycle time: 14.8 - 15.
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.
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 • Undercharged • Wrong type of refrigerant Other • Non-Manitowoc components in system • Improper water supply over evaporator refer to “Water System Checklist” on page 105.
HOT GAS VALVE General The hot gas valve is an electrically operated valve that opens when energized, and closes when deenergized. 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. Prevents refrigerant from entering the evaporator during the freeze cycle. The hot gas valve is not used during the freeze cycle.
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. ! Caution Coil must be seated 100% on solenoid to function correctly. Inst all coil with a twisting motion to properly seat.
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. The h ot g as val ve o utlet i s on the suction sid e (cool refrigerant). It may be cool enough to touch even if the valve is leaking. 3. Feel the compressor discharge line.
Findings Comments The inlet of the harvest valve is cool enough to touch and the compressor discharge line is hot. This is normal as the discharge line should always be too hot to touch and the harvest valve inlet, although too hot to touch during harvest, should be cool enough to touch after 5 minutes into the freeze cycle. Cool & Hot The inlet of the harvest valve is hot and approaches the temperature of a hot compressor discharge line.
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. The actual temperatures entering and leaving the evaporator vary by model, and change throughout the freeze cycle.
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. Comparing the temperatures over several cycles will result in a consistent maximum discharge line temperature.
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 each cycle.
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. The tables list four different defects that may affect the ice machine’s operation.
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. Enter a check mark in the “low” box. Perform the procedures and check all information listed. Each item in this column has supporting reference material.
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. A low refrigerant charge normally affects both pressures. Verify the ice machine is not low on charge before replacing an expansion valve. Add refrigerant charge in 2 oz.
4 Part Number 80-01111-9 7/10 Ice Formation Pattern Ice formation is extremely thin on top of evaporator -orNo ice formation on entire evaporator Ice formation is extremely thin on top of evaporator -orNo ice formation on entire evaporator Ice formation is normal -orice formation is extremely thin on the bottom of the evaporator or No ice formation on evaporator Ice formation is normal -orNo ice formation on entire evaporator All installation and water related problems must be corrected before procee
Freeze cycle Suction Pressure _______ _______ _______ 1 minute Middle End Stops on safety limit: 1 2 Stops on safety limit: 1 or 2 3 Stops on safety limit: 1 4 Suction pressure is High Suction pressure is Low Suction pressure is High Suction pressure is High If suction pressure is High or Low refer to freeze cycle high or low suction pressure problem checklist to eliminate problems and/or components not listed on this table before proceeding.
Part Number 80-01111-9 7/10 Hot Gas Valve Leaking Discharge Line Temp. Record freeze cycle discharge line temp at the end of freeze cycle. Final Analysis Enter total number of boxes checked in each column.
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. 1. Verify primary voltage is supplied to ice machine. 2. Verify that the fuse or circuit breaker is closed. 3. Verify control board fuse is OK. If the power light functions, the fuse is OK. 4.
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. Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill pattern.
QM30 The QM30 ice machines have a very small refrigerant charge, 5.78 oz (165 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. Mineral build-up on the evaporator assembly can cause water tracking and an erratic ice fill 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. Any number of problems can cause improper ice formation.
Ice Production Check The QM20/QM30 dice ice cube formation is slightly different from our previous models. Manitowoc ice machines have a unique cube shape. 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 for the QM20/QM30 is determined by measuring the slab weight (the combined weight of all cubes from one harvest cycle).
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 • Safety limits Refer to the following pages for refrigeration diagnostics.
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. • Normal Ice Fill Pattern is less fill on the left side of the evaporator. This occurs because the refrigeration tubing exits the evaporator on the left side. OUTLET INLET QM45 Evaporator Tubing Routing Procedure 1.
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. Refer to “Drain Connections” on page 31 for installation details. BIN DRAIN 5/8" I.D. (1.
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 • Doors and all panels must be in place • Initial freeze cycle is not used for diagnostics. Start monitoring temperatures 3 minutes into the second freeze cycle. 6.
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. Ice fill pattern is thin on the left hand side of the evaporator.
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. 1. Verify primary voltage is supplied to ice machine. 2. Verify that the fuse or circuit breaker is closed and the ice machine is plugged into a receptacle. 3. Verify control board fuse is OK. 4.
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). • Verify control board is not set for additional freeze time to fill out the ice cubes, see “Cube Weight Adjustment” on page 97. 2. Observe control board light: • Steady light indicates thermistor operation is normal.
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 • Contact a qualified company to test the quality of the incoming water and make appropriate filter recommendations Water escaping from sump during freeze cycle • Check standpipe and drain • Check for water tracking out of water circuit
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 • Air temperature must not exceed 120°F (39°C) Water inlet valve filter screen is dirty • Remove the water inlet valve and clean the filter screen Water inlet valve stuck open or leaking • Turn off ice machine, if water continues to enter ice machine, veri
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.
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. Use the operating conditions determined in step 1 to find the published normal discharge pressures. Freeze Cycle ______ Harvest Cycle______ 3. Perform an actual discharge pressure check.
DISCHARGE PRESSURE HIGH CHECKLIST Improper Installation • Refer to“Installation and Visual Inspection Checklist” on page 104.
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. NOTE: Analyze discharge pressure before analyzing suction pressure.
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. Example: Published freeze cycle time: 19.1 - 21.
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.
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. HOT GAS VALVE General The hot gas valve is an electrically operated valve that opens when energized, and closes when deenergized.
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. Valve Remains Open in the Freeze Cycle Symptoms are dependent on the amount of leakage in the freeze cycle. A small amount of leakage will cause increased freeze cycle times.
Findings Comments The inlet of the harvest valve is cool enough to touch and the compressor discharge line is hot. This is normal as the discharge line should always be too hot to touch and the harvest valve inlet, although too hot to touch during harvest, should be cool enough to touch after 5 minutes into the freeze cycle. Cool & Hot The inlet of the harvest valve is hot and approaches the temperature of a hot compressor discharge line.
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. 1. Determine the ice machine operating conditions: Air temp entering condenser: ____ Air temp around ice machine: ____ Water temp entering sump trough: ____ 2.
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. The light will flash once for each additional minute of freeze cycle time. ADJUSTING FINISHING TIME Adjust in 1-minute increments and allow the ice machine to run several freeze/harvest cycles, and then inspect the ice cubes.
Component Check Procedures 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. R emoving th e con trol boa rd fuse or moving the to ggle sw itch to OFF wil l not remove the power supplied to the control board. CHECK PROCEDURE 1.
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. 2. Automatic ice machine shut-off. If the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the ice damper and holds it down.
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: • Always use the water curtain magnet to cycle the switch (a larger or smaller magnet will affect switch operation).
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. Pull wiring into evaporator compartment.
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. 4. While depressing mounting tab roll bin switch to right to release. 5. Pull wiring into evaporator compartment.
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. The ice machine remains off until enough ice has been removed from the bin. This causes the thermostat bulb holder to warm and closes the bin thermostat, restarting the ice machine.
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) Closed (O) Replace thermostat NOTE: After covering/uncovering the bulb holder with ice, wait at least three minutes to allow the thermostat to react. (Open/Close) DECREASE LEVEL OF ICE IN BIN WARMER 4" (10.
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. The ice machine remains off until enough ice has been removed from the bin.
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. Avoid contact with the fan blade and the electrical connections. 1. To access the thermostat, remove the two screws attaching the front grill and remove the grill. 2. Remove the lower white plastic panel by pulling straight down.
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. ! Warning Disconnect electrical pow er to th e entire ice machine before proceeding. 1. Verify the capillary tube is inserted correctly in the bulb holder (17"/43 cm). 2. Remove the 2 bottom front panels to access the bin thermostat. 3.
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. Check Procedure Thermistors generally fail because of moisture or physical damage.
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° - 21.1° 60° - 70° 15.31 - 11.88 21.1° - 26.7° 70° - 80° 11.88 - 9.29 26.7° - 32.2° 80° - 90° 9.29 - 7.33 32.2° - 37.8° 90° - 100° 7.33 - 5.82 37.8° - 43.3° 100° - 110° 5.82 - 4.66 43.3° - 48.
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. A good test is to install a known good substitute capacitor. Use a capacitor tester when checking a suspect capacitor.
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. 1. Inspect the toggle switch for correct wiring. 2.
QM45/Q130/Q170/Q210/Q270 Switch Setting ON WASH OFF Terminals Ohm Reading 24-21 Open 24-20 Closed 20-21 Open 24-20 Open 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.
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. Inspect the bridge connecting the cubes. It should be about 1/8" (3.2 mm) thick. 2. If adjustment is necessary, turn the ice thickness probe adjustment screw clockwise to increase bridge thickness, or counterclockwise to decrease bridge thickness.
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. SINGLE PHASE COMPRESSORS 1.
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. • If the pressures do not move, the compressor is seized. Replace the compressor. • If the pressures move, the compressor is turning slowly and is not seized. Check the capacitors and relay.
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.
High Pressure Cutout (HPCO) Control QM45/Q130/Q170/Q210/Q270 Function Stops the ice machine if subjected to excessive highside pressure. The HPCO control is normally closed, and opens on a rise in discharge pressure. Specifications Cut-out: 450 psig 10 Cut-in: Automatic reset (Must be below 300 psig to reset). Check Procedure 1. Set ON/OFF/WASH switch to OFF. 2. Connect manifold gauges. 3. Hook voltmeter in parallel across the HPCO, leaving wires attached. 4.
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 offthe-shelf drier is in filtration. A Manitowoc drier has dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action that takes place during every harvest cycle.
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. This term usually applies to procedures implemented at the field job site or at a local service shop.
REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of CFC and HCFC refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’ products to achieve this. Important Manitowoc Ice assumes no respon sibility for use of con taminated refrigerant.
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 • Compressor motor burnouts and improper past service prevent refrigerant re-use. • Refer to “System Contamination Cleanup” on page 190 to test for contamination. 5.
RECOVERY AND RECHARGING PROCEDURES Q130/Q170/Q210/Q270 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. Important Replace the liq uid line drie r before e vacuating and recharging. Use only a Man itowoc (O.E.M.
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. 4. Perform recovery or evacuation: A. Recovery: Operate the recovery unit as directed by the manufacturer’s instructions. B. Evacuation prior to recharging: Pull the system down to 500 microns.
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. Close the high side service valve at the ice machine. C. Open the low side service valve at the ice machine (when supplied) or disconnect the low loss fitting from the access valve. D.
QM20/QM30/QM45 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. Important Replace the liq uid line drie r before e vacuating and recharging. Use onl y a Man itowoc (O.E.M.
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. RECOVERY/EVACUATION 1. Place the toggle switch in the OFF position. 2. Install manifold gauges, charging scale, and recovery unit or two-stage vacuum pump. 3. Open the high and low side valves on manifold gauges. 4. Perform recovery or evacuation: A.
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. Be sure the toggle switch is in the OFF position. 2. Close the vacuum pump valve and the low side manifold gauge valve. 3. Open the high side manifold gauge valve. 4. Open the refrigerant cylinder and add the proper refrigerant charge (shown on nameplate) through the discharge service valve. 5.
System Contamination Cleanup 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. DETERMINING SEVERITY OF CONTAMINATION System contamination is generally caused by either moisture or residue from compressor burnout entering the refrigeration system.
Contamination/Cleanup Chart Symptoms/Findings Required Cleanup Procedure No symptoms or suspicion of contamination Normal evacuation/ recharging procedure Moisture/Air Contamination symptoms Refrigeration system open to atmosphere for longer than 15 minutes Refrigeration test kit and/or acid oil test shows contamination No burnout deposits in open compressor lines Mild contamination cleanup procedure Mild Compressor Burnout symptoms Oil appears clean but smells acrid Refrigeration test kit or acid oil
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. Do not position heat lamps too close to plastic components, or they may melt or warp. Important Dry nitroge n is re commended fo r th is proce dure. This will prevent CFC release. 4.
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. Wipe away any burnout deposits from suction and discharge lines at compressor. 5. Sweep through the open system with dry nitrogen. Important Refrigerant swee ps are not re commended, as they release CFCs into the atmosphere.
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 • High side access valve • Low side access valve Important This is a required in-warranty repair procedure. 1. Disconnect power to the ice machine. 2. Follow all manufacturers’ instructions supplied with the pinch-off tool.
FIG. A - “PINCHING OFF” TUBING FIG.
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. 3. Slide the base forward until contact is made with the stop screw (approximately 2.5" [6.3 cm]). ! Caution Do not move base p ast the st op scre w, t ubing damage could result. 4.
Brazing Procedures for Danfoss Solenoid Valves • • Danfoss stainless steel solenoid valves require a slightly different brazing technique than brassbodied 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. 15% silver solder is recommended although silver bearing solder in the 5% to 55% range can be used. 1. Remove coil and verify direction of flow. DIRECTION OF FLOW ARROW SV3069 2.
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. C. Do not attempt to fill solenoid flange with solder. Solder will draw into socket. 5. Install new liquid line drier. 6. Leak check joints by pressurizing system with 150 psig nitrogen. 7.
Component Specifications Main Fuse Volt Amp QM20/QM30 250 8 QM45/SM50/ Q130/Q170/Q210/Q270 250 10 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 Bin Thermostat Cut in: 40°F (4.5°C) Cut out: 34°F (1.0°C) ON/OFF/WASH Toggle Switch Single-pole, double-throw switch. The switch is connected into a varying low D.C. voltage circuit.
High Pressure Cutout (HPCO) Control Cut-out Cut-in 450 psig ±10 (3103 kPa ±69) 31 bar ±.69 Automatic Reset 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.
Total System Refrigerant Charge Important This information is for reference only. Refer to the ice machine serial number tag to verify the system charge. Se rial p late in formation overrid es information listed on this page. Model AirCooled WaterCooled Refrigerant Type QM20 4.6 oz (130 g) NA R134A QM30 5.
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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. Entering Condenser °F/°C Freeze Time Harvest Time Water Temperature °F/°C 50/10 68/20 86/30 68/20 15-18 16-19 16-19 77/25 16-19 18-21 18-21 86/30 20-23 21-24 21-24 95/35 24-27 26-29 26-29 1.5-3.
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 Condenser °F/°C 50/10 95/35 104/40 70/21 9.1-12.9 9.4-13.4 10.2-14.5 Water Temperature °F/°C 80/27 10.0-14.2 10.5-14.8 11.4-16.1 90/32 10.9-15.4 11.4-16.1 12.6-17.7 100/38 12.3-17.3 12.9-18.1 14.3-20.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 14.6-16.5 17.6-19.9 20.3-23.0 80/27 15.5-17.5 18.9-21.3 22.0-24.9 90/32 17.6-19.9 22.0-24.9 26.3-29.7 100/38 20.3-23.0 23.9-27.1 29.0-32.
QM45 OPERATING TEMPERATURES NOTE: Suction temp drops gradually throughout the freeze cycle. 50°F (10°C) Water Freeze Cycle Air Temp.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 15.6-17.8 15.3-17.4 15.6-17.8 80/27 16.6-18.9 17.0-19.4 17.4-19.8 90/32 17.4-19.8 19.1-21.7 18.2-20.7 100/38 19.2-22.1 19.8-22.7 22.4-25.4 110/43 24.9-28.2 25.7-29.1 31.4-35.5 Water Temperature °F/°C Harvest Time 1.0-3.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 10.2-11.7 12.4-14.1 14.6-16.5 Harvest Time Water Temperature °F/°C 80/27 11.2-12.8 13.0-14.8 15.5-17.5 90/32 13.0-14.8 15.5-17.5 17.6-19.9 100/38 14.6-16.5 17.6-19.9 20.3-23.0 1.0-2.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 10.2-12.4 12.3-14.8 14.3-17.2 80/27 11.7-14.1 13.6-16.3 16.1-19.3 90/32 13.6-16.3 15.2-18.2 18.3-21.9 100/38 15.2-18.2 18.3-21.9 21.1-25.2 Water Temperature °F/°C Harvest Time 0.75-2.
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 Machine °F/°C 50/10 70/21 90/32 70/21 10.2-12.4 12.3-14.8 14.3-17.2 80/27 10.7-12.9 12.3-14.8 15.2-18.2 90/32 10.7-12.9 12.9-15.5 15.2-18.2 100/38 11.2-13.5 12.9-15.5 16.1-19.3 Water Temperature °F/°C Harvest Time 1.0-2.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 17.6-20-1 NA 24.5-28.0 Water Temperature °F/°C 80/27 NA 20.9-23.9 NA 90/32 20.9-23.9 24.5-28.0 28.1-31.9 100/38 NA NA 33.7-38.3 Harvest Time 1.0-2.5 Times in minutes 24 Hour Ice Production Water Temperature °F/°C Air Temp.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 14.8-16.9 17.5-19.9 19.8-22.5 80/27 16.1-18.3 19.2-21.8 21.9-24.9 90/32 17.5-19.9 21.2-24.0 24.5-27.8 100/38 19.2-21.8 23.6-26.8 27.8-31.5 Water Temperature °F/°C Harvest Time 1.0-2.
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. Around Ice Machine °F/°C Water Temperature °F/°C 50/10 70/21 90/32 70/21 14.5-16.5 15.6-17.8 19.2-21.8 80/27 14.8-16.9 16.1-18.3 19.8-22.5 90/32 15.6-17.8 17.0-19.3 21.2-24.0 100/38 16.1-18.3 17.5-19.9 21.9-24.9 Harvest Time 1.0-2.5 Times in minutes 24 Hour Ice Production Air Temp.
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 Condenser °F/°C 50/10 70/21 90/32 70/21 11.0-12.6 12.8-14.7 14.5-16.5 80/27 11.3-12.9 13.1-15.0 14.8-16.9 90/32 12.6-14.3 14.8-16.9 17.0-19.3 100/38 14.1-16.1 17.0-19.3 19.8-22.5 Water Temperature °F/°C Harvest Time 1.0-2.
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 Machine °F/°C 50/10 70/21 90/32 70/21 10.6-12.2 12.3-14.0 13.5-15.4 80/27 10.8-12.4 12.6-14.3 13.8-15.7 90/32 11.0-12.6 12.8-14.7 14.1-16.1 100/38 11.3-12.9 13.1-15.0 14.5-16.5 Water Temperature °F/°C Harvest Time 1.0-2.5 Times in minutes 24 Hour Ice Production Air Temp.
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 electrical circuitry.
QM20 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L1 L2 (N) COMPRESSOR THERMISTOR R OVERLOAD PROTECTOR (3) C ICE THICKNESS ADJUSTMENT DIAL (9) CONTROL BOARD (24) S STARTING DEVICE FAN MOTOR (AIR COOLED ONLY) (23) LIGHT (14) 1 WATER PUMP (22) HOT GAS SOLENOID (21) 2 3 (13) (20) (6) FUSE TRANS.
QM30 115V/1 Ph/60 Hz CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. L1 (N) (27) (26) COMPRESSOR THERMISTOR COMPRESSOR RELAY CONTACTS R OVERLOAD PROTECTOR (3) C CONTROL BOARD S (25) 1 3 COMPRESSOR RELAY COIL (9) (24) STARTING DEVICE FAN MOTOR (AIR COOLED ONLY) OVERFLOW 1 JUMPER WIRE (AIR COOLED) OVERFLOW 2 LIGHT (23) (14) 1 (22) WATER PUMP HOT GAS SOLENOID (21) 2 3 (13) FUSE (20) (6) TRANS.
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. L1 L2 (N) COMPRESSOR THERMISTOR R OVERLOAD PROTECTOR (3) C ICE THICKNESS ADJUSTMENT DIAL CONTROL BOARD (9) LIGHT (24) STARTING DEVICE S (23) FAN MOTOR (AIR COOLED ONLY) OVERFLOW 1 JUMPER WIRE (AIR COOLED) OVERFLOW 2 (14) 1 WATER PUMP (22) HOT GAS SOLENOID (21) 2 3 (13) (20) (6) FUSE TRANS.
QM45 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE. L1 (22) ICE THICKNESS PROBE L2 (N) ON (24) OFF BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (10) (21) BIN SWITCH LIGHT (11) HARVEST LIGHT (2) RELAY COIL (3) 3 2 (7) HOT GAS SOLENOID 1 (6) FUSE (8) TRANS.
SM50 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. L1 L2 START CAPACITOR S COMPRESSOR (23) (32) C R (33) CONTROL BOARD START RELAY (24) (20) TRANS.
Q130/Q210 Tecumseh Compressor L1 L2 (N) NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE (22) ICE THICKNESS PROBE ON (24) OFF BIN SWITCH (23) WASH TOGGLE SWITCH (20) CONTROL BOARD (21) (10) BIN SWITCH LIGHT (11) HARVEST LIGHT (2) CONTACTOR COIL (3) 3 2 (7) HOT GAS SOLENOID 1 (6) FUSE (8) TRANS. WATER PUMP (5) (14) (4) HIGH PRES.
Q130/Q170/Q210 Danfoss Compressor NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L1 (22) ICE THICKNESS PROBE L2 (N) ON (24) OFF BIN SWITCH WASH (23) TOGGLE SWITCH (20) CONTROL BOARD (21) (10) BIN SWITCH LIGHT (11) (2) HARVEST LIGHT RELAY COIL (3) 3 2 (7) HOT GAS SOLENOID 1 (6) (8) FUSE WATER PUMP TRANS. (14) (5) (4) HIGH PRES.
Q270 Tecumseh Compressor CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L1 (22) ICE THICKNESS PROBE L2 (N) ON (24) OFF BIN SWITCH (23) WASH TOGGLE SWITCH CONTROL BOARD (20) (21) BIN SWITCH LIGHT (GREEN) (10) CONTACTOR COIL (2) HOT GAS SOLENOID 3 (7) (6) 2 WATER PUMP (5) 1 TRANS. FUSE (10A) FAN CYCLE CONTROL (4) (14) (16) (3) HARVEST LIGHT (RED) HIGH PRES.
Q270 Danfoss Compressor NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L1 TOGGLE SWITCH (22) ON (24) ICE THICKNESS PROBE L2 (N) OFF BIN SWITCH WASH (23) (20) CONTROL BOARD (21) (11) BIN SWITCH LIGHT (GREEN) (10) HARVEST LIGHT (RED) (2) RELAY (3) 3 2 (7) HOT GAS SOLENOID 1 (6) FUSE (8) TRANS. WATER PUMP (5) (9) (4) HIGH PRES.
Electronic Control Boards QM20/QM30 LIQUID LINE THERMISTOR CONNECTION ICE BRIDGE THICKNESS CONTROL -2 -3 -4 -1 0 1 2 -5 3 4 POWER LIGHT 8 AMP FUSE Part Number 80-01111-9 7/10 227
QM45/Q130/Q170/Q210/Q270 ICE THICKNESS PROBE DC LOW VOLTAGE ELECTRICAL PLUG BIN SWITCH LIGHT HARVEST LIGHT AC LINE VOLTAGE ELECTRICAL PLUG 10 AMP FUSE 228 Part Number 80-01111-9 7/10
SM50 FUSE (7A) TRANSFORMER THERMISTOR BIN LIGHT CONNECTION DISPLAY BOARD CONNECTION BIN LIGHT SWITCH BIN THERMOSTAT CONNECTION Part Number 80-01111-9 7/10 229
Tubing Schematics QM20/QM30 Tubing Schematic HEAT EXCHANGER CAP TUBE COMPRESSOR EVAPORATOR HOT GAS SOLENOID VALVE CONDENSER DRIER SV3022 230 Part Number 80-01111-9 7/10
QM45/Q130 Tubing Schematic EVAPORATOR HEAT EXCHANGER EXPANSION VALVE COMPRESSOR HOT GAS SOLENOID STRAINER AIR OR WATER CONDENSER DRIER RECEIVER (Q130 WATER COOLED ONLY) SV3024 Part Number 80-01111-9 7/10 231
SM50 Tubing Schematic HEAT EXCHANGER CAP TUBE COMPRESSOR EVAPORATOR HOT GAS SOLENOID VALVE CONDENSER DRIER 232 Part Number 80-01111-9 7/10
Q170/Q210/Q270 Tubing Schematic EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR STRAINER AIR OR WATER CONDENSER DRIER COMPRESSOR RECEIVER (WATER COOLED ONLY) SV3023 Part Number 80-01111-9 7/10 233
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