AF300 INTRODUCTION To the owner or user: This service manual is intended to provide you, and the maintenance or service technician, with the information needed to install, start up, clean, maintain and repair this product. The AF300 is an ice machine that produces flaked ice and stores it in a insulated bin. It automatically maintains the level of ice by turning on when the ice level falls and switches off when it is full. This unit in serviceable in place; the ice storage bin and hood may be removed from the chassis to allow service access without removing the ice machine from its installed location. The refrigeration system uses R-22 as the refrigerant. Table of Contents Specifications Limitations Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4 Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5 Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6 Cabinet Removal Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8 Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9 Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11 Water Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15 Refrigeration Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 16 Technical Charateristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 17 Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18 Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 20 Parts lists and wiring diagrams are located in the center of this manual, printed on yellow paper. Keep this manual for reference. This manual was printed on recycled paper. AF300 Specifications 14.25 IN The nameplate is located on the back panel. A serial number plate is located behind the right grill, in front of the control box, on the base. SERIAL NUMBER PLATE The unit is equipped with an electrical power cord, but should only be plugged into a circuit dedicated to the ice machine. Model Number Dimensions (w/o) legs H xWxD AF300AE-1A 33 x 241/4 x 24 Basic Electrical 115/60/1 Ice Type Condenser Type Air Water Typical Amps 9 9 Maximum Fuse 15 15 Refrigerant Flake Flake R-22 R-22 AF300WE-1A 33 x 241/4 x 24 115/60/1 A scoop and legs (6") are included. January 1993 Page 2 AF300 For The Installer: Environmental Limitations The ice machine must be installed indoors in a controlled environment. Minimum Air Temp Water Temp Water Pressure Voltage 50 F. 400F. 20 PSI 103.5 0 Maximum 1000F. 1000F. 80 PSI 126.5 AIR OUT AIR IN Operating the ice machine outside of the above limitations, or outdoors, is potentially damaging to the machine, and it is misuse of the machine. This may void the warranty. Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards of UL, NSF, and CSA. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any part and/or other components not specifically approved by Scotsman. Scotsman reserves the right to make design changes and/or improvements at any time. Specifications and design are subject to change without notice. Airflow on air cooled models: · Intake through the right grill. · Exhaust from the left grill. Do not install wher this air flow is blocked. The AF300 has a removable cabinet. When installed, the machine should have some extra clearance (1/8") on the left and right sides so that the cabinet may be easily removed when the machine is in place. January 1993 Page 3 AF300 Installation: Water The water supply for this ice machine has been in contact with many materials since it fell from the sky as rain. All rain is slightly acidic, and tends to dissolve the materials it comes in contact with. During water's journey to the ice machine, it has flowed over and through the ground, been picked up by a municipal or private pump, forced through a series of pipes of differing construction and may have been treated by the municipality providing the water. The water supplied to this ice machine will then contain a variety of substances that will likely show up as solids during the ice making process. These solids are similar to those found when water is boiled out of a saucepan. Only the water boils away, and the minerals that were in the water solidify in the pan. During ice making the water is frozen into ice, and many of the minerals stay behind in the ice machine water system. After time the minerals will have to be dissolved by ice machine cleaner, then flushed away during the cleaning process. An ice machine is a food manufacturing plant; it takes a raw material, in this case water, and transforms it into a food product, ice. The purity of the water is very important in obtaining pure ice and in maximizing product life. The water to the ice machine should be filtered. Water filters vary greatly in ability and function. Install one that filters out suspended solids to a dimension of 5 microns or less. The finer the filter the better, but finer filters may plug-up sooner than course ones. It may be necessary to add a course filter ahead of the fine filter to prolong filter life. Have the water tested. Either acidic water or alkaline water will cause corrosion. Dissolved solids cannot be filtered out. Check with a water treatment specialist regarding testing, treatment and filters. This ice machine may be installed in the open or under a counter. No clearance is required at the sides or top beyond what's needed to place the cabinet into position. Air cooled models blow air in and out through the grills at the front. Space is required for utility connections at the back. The ice machine is not designed for outdoor use. It must be installed indoors, in a controlled environment. The air and water temperatures must not exceed rated limits. Electrical power is supplied through a cord connected to the unit. All local codes must be followed. Pre-installation: 1. Inspect the place where the ice machine is to be installed. Check for: · space for the cabinet · water supply, · drain availability · and electrical power supply. No extension cords are allowed. The building drain inlet must be lower than the drain outlet(s) at the back of the ice machine. The water supply must have a hand shut off valve accessible when the unit is installed. 2. Determine the method of installation, is the machine to be installed under the counter? Is the drain in the floor under the machine? Is the water inlet accessible from the top? January 1993 Page 4 AF300 Installation: For The Plumber 1. Connect cold potable water to the 3/8" male flare at the top back of the cabinet. A water filter is recommended. Flush the water line prior to connecting to the ice machine. A loop of copper tubing may be used between the ice machine and the water supply. This will allow the ice machine to be pulled out from its installed location without disconnecting the water line. No back-flow preventer is required in the inlet potable water line because provision for that is incorporated in this N.S.F. listed product (the float seat is above the reservoir water level and cannot siphon). 2. Connect a drain tube the drain fitting. If water cooled, the drain tubes must be run separately. The bin drain fitting is 3/4" F.P.T. brass. · Drain tube material must be rigid and meet local code. · Traps in the bin drain line without vents ahead of them will cause poor draining. · The bin drain must be vented if there is a long horizontal run (5' or more). All drains are gravity, and must have a minimum fall of 1/4" per foot of horizontal run. · Maintain the air gap required by local code between the end of the drain tubes and the building drain receptacle. · Drain tubing should be insulated to prevent condensation from forming on the tubing. 3.The unit is set up for drain connections on the outside of the cabinet. To connect the drains inside would require the removal of the drain fittings attached to the back panel, and field fabricated drain tubes routed inside the base of the unit. AIR COOLED PLUMBING BIN DRAIN FLOOR DRAIN POTABLE WATER INLET WATER COOLED PLUMBING RESERVOIR OVERFLOW DRAIN DETAIL OF DRAIN, VENT IF OVER 5' OF HORIZONTAL RUN POTABLE WATER INLET CONDENSER DRAIN January 1993 Page 5 CONDENSER INLET AF300 Installation For The Electrician This is a cord-connected unit, and must be on a separate 115 volt AC 60 cycle single phase power supply. The maximum fuse size for this circuit should be 15 amps, per the nameplate use fuses, or HACR circuit breakers. Follow All Local Codes - THIS UNIT MUST BE GROUNDED. Do not use extension cords and do not disable or by-pass ground plug on electrical plug. After Utility Connections: 1. Level the cabinet, use the leg levelers on the end of the legs to adjust the cabinet height. (Legs should have been installed when the unit was unpacked). 2. Wash the bin and hood. If desired, the interior of the bin could be sanitized. 3. Locate the scoop, wash it and have it available for use when needed. Final Check List 1. Is the ice maker cabinet in a room where ambient temperatures are within the minimum and maximum temperatures specified? 2. Has the water supply been connected? 3. Is the water pressure adequate? 4. Have the water connections been checked for water leaks? 5. Have the drain connections been made? 6. Have the drain connections been checked for leaks? 7. Is the cabinet level? 8. Is the ice machine plugged into a 115 volt electrical power supply and is the ice machine the only load on that circuit? 9. Has all of the shipping material been removed from the inside of the cabinet? 10. Has the bin and cabinet been wiped clean and sanitized? 11. Has the Customer Evaluation & Warranty Registration form been filled out? Check for correct model and serial numbers from the nameplate, then mail the completed form to Scotsman. January 1993 Page 6 12. Has the owner/user been given the name and telephone number of the authorized Scotsman Service Agency serving that location? AF300 Removal of the Cabinet One of the most useful features of this ice machine is the ability to remove the cabinet from the ice machine without removing the ice machine from its installed position. To Remove: 1. Switch the master switch to OFF. Be certain the ice machine has been switched off. 2. Open the bin door and turn the knobs to unscrew the mounting bolts at the left and right inside of the ice storage bin. Remove the mounting bolts. 3. Pull the hood and door assembly straight out until it can be lifted up. Caution: the door may be free to come out the back of the hood when removed from the cabinet base. 4. To remove the cabinet base the hood must be removed first. 5. Remove 4 screws and the two grills at the front of the base. 6. In the area exposed when the grills are removed are two knobs similar to those removed in step 2. Unscrew and remove the two knobs. 7. Locate bin drain. Loosen hose clamp holding drain tube to fitting and pull the drain tube off of the fitting. 8. Lift up the front of the base and rotate the base up and off of the ice machine. The machine is now exposed for service. STEP 8 STEP 5 STEP 2 STEP 3 HOOD STEP 6 BIN DRAIN January 1993 Page 7 AF300 Component Location The ice machine is designed for front service. Many components are serviceable from the front without removing the cabinet. With the cabinet removed, nearly all components are serviceable. In the bin area can be found · Float · Reservoir · Evaporator · Bin Thermostat sensing tube Behind the right front grill on the front edge of the control box: · Bin thermostat · Master switch Inside the control box are the auger delay control, low pressure cut out, and the contactor. Auger Delay Pressure Control: This pressure switch, connected to the low side of the refrigeration system, controls the auger drive motor. Low Pressure Control: This pressure switch, connected to the low side of the refrigeration system, is normally closed when the machine is operating. If the low side pressure should drop too low, the control will open (at 0-4 PSIG), stopping the ice maker. It is an automatic reset. High Pressure Control: The pressure switch is designed to open and shut off the machine s ...