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INTRODUCTION
To the owner or user: The service manual you are
reading is intended to provide you, and the
maintenance or service technician with the
information needed to install, start up, clean,
maintain, and service this ice maker-dispenser.
The MDT6 is a combination nugget ice maker and
countertop dispenser. A water station is standard.
FOR THE INSTALLER: Specifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2
FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 3
FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4
FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5
FOR THE INSTALLER: Final Check List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6
INITIAL START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9
CONTROL BOX
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10
ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11
OPERATION: Water · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13
OPERATION: Ice Vending · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14
DISPENSE AREA SANITATION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15
CLEANING and SANITIZING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16
SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17
BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18
AUGER MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19
SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20
CONTROL SYSTEM DIAGNOSTICS
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 22
REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 23
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24
REMOVAL AND REPLACEMENT: Water Seal · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
REMOVAL AND REPLACEMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26
TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY · · · · · · · · · · · · · · · · · · Page 27
REFRIGERATION SERVICE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28
This manual was printed on recycled paper.
Keep it for future reference.
The ice making section is equipped with the
following features: electronic controls for bin level
and low water; thermostatic expansion valve; front
service for most components; and R-404A
refrigerant. The ice dispensing section is a
seamless plastic storage bin, with a stainless steel
ice agitator at the bottom to sweep the ice into the
dispensing chute.
Table of Contents
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21
May 2001
Page 1
Note this symbol when it appears.
It marks a possible hazard.
MDT6N90
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Related Manuals for Scotsman MDT6N90W1J
Summary of Contents for Scotsman MDT6N90W1J
- Page 1 MDT6N90 INTRODUCTION To the owner or user: The service manual you are The ice making section is equipped with the reading is intended to provide you, and the following features: electronic controls for bin level maintenance or service technician with the and low water;...
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Page 2: For The Installer: Specifications
MDT6N90 FOR THE INSTALLER: Specifications Scotsman assumes no liability or responsibility of This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop. any kind for products manufactured by Scotsman Before beginning the installation, check that all the... -
Page 3: For The Installer
Counter Top or Machine Stand Installation The base of the icemaker-dispenser must be sealed to the object it rests upon. Food grade silastic sealant such as Scotsman part number 19-0529-01 is recommended. Place a bead of the sealant on the machine stand or counter top to match the outside edge of the cabinet base and sink. -
Page 4: For The Plumber
MDT6N90 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: Connect a clean, potable and cold water supply to the ” male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. Use ”... -
Page 5: For The Electrician
MDT6N90 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Connect the electrical power supply for the unit to the wires in the junction box at the rear of the machine. Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. -
Page 6: For The Installer: Final Check List
MDT6N90 FOR THE INSTALLER: Final Check List 1. Is the icemaker-dispenser installed ELECTRICAL? indoors, in a location where the air and LEVELED? water temperatures are controlled, and where they do not go beyond design limitations? 2. is there an electrical service disconnect within sight of the installed machine? Is the machine on a separate circuit? Has the voltage been checked... -
Page 7: Initial Start-Up
10. Fill out the Customer Evaluation and warranty between 200 PSIG and 300 PSIG. Registration form, and mail it in to Scotsman or Water cooled discharge pressure should be about register on line at www.scotsman-ice.com 245 PSIG. -
Page 8: Component Description
MDT6N90 COMPONENT DESCRIPTION RESERVOIR WATER LEVEL ICE LEVEL SENSOR SENSOR ICE STORAGE BIN CONTROL BOX EVAPORATOR DRAIN TUBE CONDENSER Ice Level Sensor: An electronic “eye”, it senses PRESSURE the presence of ice in the bottom of the ice CUT OUT discharge chute. -
Page 9: Water Seal
MDT6N90 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled with Motor: A split phase motor that drives the gear water and containing a water seal and auger. reducer. Auger: A solid stainless steel double spiral auger, Thrust Bearing: As the ice is pushed up the it pushes the ice crystals up to the top of the evaporator, the auger is thrust down, and pressure evaporator. -
Page 10: Control Box
MDT6N90 CONTROL BOX Circuit Board: The circuit board receives input signals from several sensors and translates them to control the electrical power supply to the various loads. The sensors include: · Touch Free ice or water. · Ice level in the bin. ·... -
Page 11: Electrical Sequence
MDT6N90 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. After a 6 minute delay, If the ice level sensor is clear (bin empty) for more than 15 seconds, the The “Power” light on the board glows whenever machine will start up again. there is power to the machine (and the master switch is ON). -
Page 12: Operation: Water
MDT6N90 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. Reservoir overflow, evaporator condensation and Note: The correct water level is determined when the machine is operating. - Page 13 MDT6N90 OPERATION: Refrigeration Beginning at the compressor, the refrigerant is At the evaporator, the refrigerant enters an area of compressed into a high temperature gas. The relatively low pressure, where it can easily “boil off” discharge line directs this gas to the condenser. At or evaporate.
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Page 14: Operation: Ice Vending
MDT6N90 OPERATION: Ice Vending When the ice dispensing sensor detects a container in front of it, the control board connects an electrical circuit to the ice chute door solenoid causing the ice chute door to open. At the same time power is connected to the agitator drive motor. -
Page 15: Dispense Area Sanitation
MDT6N90 DISPENSE AREA SANITATION The dispense area; spouts, sink, grill and splash panel will need periodic cleaning and maintenance. 1. The ice chute may be pulled down to remove it from the ice dispenser. Wash and sanitize it. 2. The sink grill may be removed for washing and sanitizing. -
Page 16: Cleaning And Sanitizing
- continue icemaking until ice tastes sweet. 7. Prepare the cleaning solution: Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water. The water should be between 90-115 DO NOT USE any ice produced from the degrees F. -
Page 17: Sensor Maintenance
MDT6N90 SENSOR MAINTENANCE 1. The ice machine senses water level by a probe 2. The bin control uses devices that sense light, located in the water reservoir. At least twice a year, therefore they must be kept clean enough so that the probe should be removed from the reservoir, they can “see”. -
Page 18: Bearing Maintenance
If the bearing only needs grease, inject grease into the bearing using Scotsman grease needle pn Breaker 02-3559-01 and Scotsman bearing grease Cover cartridge, pn A36808-001. -
Page 19: Auger Maintenance
MDT6N90 AUGER MAINTENANCE In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator and auger becoming coated with these minerals, requiring a BREAKER AND more frequent removal than twice per year. If in AUGER ASSEMBLY doubt about the condition of the evaporator and auger, the auger can be removed so the parts can... -
Page 20: Service Diagnosis
MDT6N90 SERVICE DIAGNOSIS Symptom Possible Cause Probable Correction No ice is made, nothing operates Unit off due to no power Restore Power Unit off due to master switch in Switch master switch to ON. OFF position. Unit off due to low water level. Check water supply, filter, float valve. -
Page 21: Control System Diagnostics
MDT6N90 CONTROL SYSTEM DIAGNOSTICS The control system consists of: · Control Board · Water Sensor · Ice Sensors · Vending Sensors 1, Power Light 2, Bin Empty Light 3, Delay Timer Light 4, No Water Light Explanation of Indicator Light Position On Name and Meaning of Board... -
Page 22: Removal And Replacement
MDT6N90 REMOVAL AND REPLACEMENT WATER RESERVOIR 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. To remove float only, pry the mounting flanges apart enough to lift one float pivot pin out of the flange hole, and pull float up and out of the reservoir. -
Page 23: Removal And Replacement: Bearing And Breaker
2. Unscrew three studs and remove ice chute materials are required to install properly. cover. a. Add food grade grease such as Scotsman part 3. Unscrew and remove ice sweep. number 19-0569-01 to the seal area before 4. Lift up and remove ice chute. -
Page 24: Sharp Edges
MDT6N90 REMOVAL AND REPLACEMENT To Remove the Auger: e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole. Turn off the water to the machine, and unclip the The size of that hole is 5/8"-18. evaporator drain hose, pull it down and drain the evaporator into the bin or a container. -
Page 25: Removal And Replacement: Water Seal
4. Place a small bead of food grade silastic sealant (such as 732 RTV or Scotsman part number 19-0529-01) on the area of the auger where the water seal is to be mounted. - Page 26 MDT6N90 REMOVAL AND REPLACEMENT To Replace the Evaporator: To Reassemble the Evaporator and Auger (Assuming all the steps for removal of the thrust 1. After the gearmotor has been inspected, fasten bearing, breaker, auger, and water seal have been the evaporator to the gear motor, be sure that the performed.) number of shims indicated on the gear case cover is in place between the gearcase cover and the...
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Page 27: To Remove And Repair The Gearmotor Assembly
MDT6N90 TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY (Assuming that the procedures through removal of D) After replacing parts as required, (if any) reassemble the gearcase. The two smaller gears the water seal have been performed.) and the oil should be in the lower case, the output 1. -
Page 28: Refrigeration Service
MDT6N90 REFRIGERATION SERVICE General: This ice machine uses R-404A refrigerant Instructions for Liquid Charging R-404A and polyolester oil. Do NOT use mineral oil in this In preparation for charging, the low side hose refrigeration system. should have a sight glass, and/or a restricting device (such as a “Charge Faster”) installed in it for ·...
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