Scotsman MDT5N25 manual

INTRODUCTION T o 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 machine is a combination nugget ice maker and countertop dispenser , with the option of wall mounti[...]

FOR THE INSTALLER: Specifications This ice maker-dispenser is designed to be mounted on a machine stand, or a countertop, or using wall mounting kit KWB3, hung from a wall. The sink may be retained, or removed and the optional longer splash panel (KSP5) installed in place of the original. Instructions for each kit are included in this service manua[...]

FOR THE INSTALLER: Environmental Limitations Installation Limitations This ice system is designed to be installed indoors, in a controlled environment. Minimum Maximum Air T emp 50 0 F . 100 0 F. W ater T emp 40 0 F . 100 0 F. W ater Pressure 20 PSI 80 PSI V oltage (1 15v) 104 126 Operating the machine outside of the above limitations, or outdoors,[...]

FOR THE INSTALLER Location After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space above and behind it for service. Air cooled models require a minimum of 6 inches to the left and right of the machine for air circulation. Machine Stand Installation T i[...]

FOR THE INSTALLER: Wall Mount Kit CAUTION It is recommended that the wall mounting installation be done by an experienced contractor . The weight of the machine when in use may exceed 350 pounds. The unit should be mounted on a solid, rigid wall with proper fasteners for that type of wall and of adequate strength to support the weight of the machin[...]

FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES W ater Inlet Air Cooled Models: The recommended water supply is clean, cold water . Use 3/8" O.D. copper tubing, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply . W ater T reatment: In most areas, a water filter of [...]

FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through 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 . The machine requires a solid chassis to earth ground wire. The ice maker should be [...]

FOR THE INSTALLER: Final Check List 1. Is the icemaker-dispenser installed indoors, in a location where the air and water temperatures are controlled, and where they do not go beyond design limitations? 2. Is there an electrical disconnect (switch or plug as required) within sight of the installed machine? Is the machine on a separate circuit? Has [...]

INITIAL START UP Pre Start Inspection 1. Remove the two front panels. 2. Check that all shipping blocks have been removed. 3. Remove any and all packing tape (check inside the storage bin). 4. Inspect the interior of the machine for loose screws or wires. Check that no refrigerant lines are rubbing each other . Check that the fan blade on air coole[...]

COMPONENT DESCRIPTION High Pressure Cut Out Switch : A manual reset switch sensing the high side refrigeration pressure. It is set to shut the machine off if the discharge pressure should ever exceed 450 psig. Evaporator: A vertical stainless steel tube, refrigerated, and water filled. In it there is a stainless steel auger . Reservoir: Float opera[...]

COMPONENT DESCRIPTION Evaporator : A refrigerated vertical tube filled with water and containing a water seal and auger . Auger: A solid stainless steel double spiral auger , it pushes the ice crystals up to the top of the evaporator . W ater Seal: A two part “face” seal, the top half rotating with the auger , the bottom half stationary , the s[...]

COMPONENT DESCRIPTION: 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. · Water level in the reservoir. The loads include: · Compressor contactor · Fan [...]

ELECTRICAL SEQUENCE Refer the wiring diagram as needed. The “Power” light on the board glows whenever there is power to the machine (and the master switch is ON). If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to ON does the following: · The bin empty and power lights on the circu[...]

OPERATION: Water W ater enters the machine through the 3/8" male flare at the rear of the cabinet, goes to a strainer and then 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 water in the s[...]

OPERATION: Refrigeration Beginning at the compressor , the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser . At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line to t[...]

OPERATION: Ice Vending Dispensing takes place when the T ouch Free sensor ’ s infrared beam bounces back to the sensor from a container placed directly in front of it. If the container is in front of the T ouch Free sensor on the left side, the ice dispensing vane will rotate and sweep ice over the ice dispensing chute: ice will continue to disch[...]

MDT5N25 & MDT5N40 May 2001 Page 17 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 . W ash and sanitize it. 2. The sink grill may be removed for washing and sanitizing. 3. The sink should be flush[...]

CLEANING and SANITIZING A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order to receive the best return for that investment, it MUST receive periodic maintenance. It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and less costly in the lon[...]

MAINTENANCE AND CLEANING 1. Air Cooled Models: Check the air cooled condenser for lint, dirt or grease build-up. Clean with vacuum or soft brush until light can be seen thru the fins. 2. The ice machine senses water level by a probe located in the water reservoir . At least twice a year , the probe should be removed from the reservoir , and the tip[...]

MAINTENANCE AND CLEANING 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 more frequent removal than twice per year . If in doubt about the condition of the evaporator and auger , the auger can be removed s[...]

MDT5N25 & MDT5N40 May 2001 Page 21 SERVICE DIAGNOSIS Symptom Possible Cause Probable Correction No ice made, nothing operates Unit off due to no power Restore power Unit off due to master switch in OFF position Switch master switch to ON Unit off due to low water level Check water supply, filter, strainer, float valve. Correct water supply Unit[...]

MDT5N25 & MDT5N40 May 2001 Page 22 Symptom Possible Cause Probable Correction No water is vended Check ice vending system, if no ice will dispense, check the splash panel cleaning switch Allow 2 minutes for system to reset Check water supply Restore water supply Check inlet water valve Replace valve if necessary Makes ice, but with excessive no[...]

MDT5N25 & MDT5N40 May 2001 Page 23 Explanation of Indicator Light Position On Board Name and Meaning of Light or Reset On at all times when the master switch is ON and machine is connected to electrical power. 1 Power , ON = Normal On when ice level is low (unit making ice). 2 Bin Empty , ON = Needs Ice Normal 6 minute off/delay start. To preve[...]

REMOVAL AND REPLACEMENT W A TER RESERVOIR 1. Shut off the water supply to the icemaker . 2. Remove front panel and reservoir cover . 3. Disconnect inlet water line from valve. 4. T o remove just the float, push the locking tab at the back of the valve mounting block in and lift the valve and block up and out of the reservoir tank. Note: inside the [...]

REMOVAL AND REPLACEMENT: Bearing And Breaker Note: Removal of the auger , water seal, evaporator and gearmotor must begin at the top of the assembly . T o Remove the Breaker Bearing Assembly: 1. Remove panels and disconnect electrical power . 2. Move bail clamp back and remove ice chute cover . 3. Unscrew and remove ice sweep. 4. Remove insulation [...]

REMOVAL AND REPLACEMENT T o Remove the Auger: T urn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container . 1. The top panel must be removed. 2. Remove ice chute cover . 3. Unscrew ice sweep. 4. Remove ice chute body . 5. The auger and breaker/bearing may now be removed[...]

REMOVAL AND REPLACEMENT: Water Seal T o Remove the W ater Seal: (Assuming all steps to remove the auger have been performed.) 1. The gearmotor/evaporator assembly will have to be exposed. (See illustration - next page) 2. Remove the 4 hex head cap screws holding the evaporator to the gearmotor assembly . Lift the evaporator up and off of the gearmo[...]

REMOVAL AND REPLACEMENT T o Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker , auger , and water seal have been performed.) 1. Discharge the refrigerant from the ice maker . 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. CAUTION Heat sink the TXV body when unsweating [...]

TO REMOVE AND REPAIR THE GEARMOTOR ASSEMBLY (Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor . 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate. 3. Remove the gearmotor from the icemaker . T o Inspect the gearmotor . A) Remove the c[...]

REFRIGERATION SERVICE: R-404A (HP62) THIS ICE MACHINE USES HP62 REFRIGERANT AND POL YOLESTER COMPRESSOR OIL. DO NOT USE MINERAL OIL IN THIS REFRIGERA TION SYSTEM. · R-404A is a “Near Azeotrope”, and therefore liquid charging is required. Weigh into the discharge side as much as possible of the charge as liquid refrigerant. Install a sight glas[...]

MDT5N25 & MDT5N40 May 2001 Page 31 REFRIGERATION SERVICE General Information: Work on the refrigeration system should only be done when it is certain that the system needs repair . · Refrain from checking refrigeration pressures without reason. Visual inspection of the water system, observation of the ice formation, amp draw, voltage, and othe[...]

MDT5N25 & MDT5N40 May 2001 Page 32 CIRCUIT BOARD SERVICE Printed Circuit Board Handling Precautions Follow these simple precautions when replacing a Printed Circuit Board 1. Keep the replacement PC Board in the anit-static packaging until it is ready to be installed. 2. Be sure that your hands are clean. 3. Just before touching the board, touch[...]