AFE325 AFE325 Product Manual Purpose of this manual: To provide detailed installation and operation instructions; to give insights into how the machine works; to list possible causes for problems; and to suggest procedures for specific types of service. The AFE325 is an ice maker that makes and stores flaked ice. The refrigeration system is either air or water cooled, and it uses R-134a as a refrigerant. The control system uses thermostat as a bin control and a water pressure switch as the water safety control. Table of Contents Specifications: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 To The Installer: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 For The Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4 For The Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5 Final Check List & Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6 User Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7 Component Location: Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8 Refrigeration System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9 Water System Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10 Mechanical Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11 Sanitation and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12 Maintenance And Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13 Maintenance: Air Cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14 Maintenance: Component Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15 Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16 Removal and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18 Water Seal & Bottom Bearing Replacement: . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19 Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20 Gear Reducer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21 Gear Reducer Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22 A Parts List and Wiring Diagram are located in the center of this manual, printed on yellow paper. August 1994 Page 1 AFE325 Specifications: The finish for this machine is either painted enamel or stainless steel. No panel kit is available to convert an enamel machine to stainless steel. Scotsman ice machines, like the AFE325, are designed to be installed indoors, in a controlled environment. The minimum and maximum operating conditions are: ·Minimum Air Temperature: 50oF. ·Maximum Air Temperature: 100oF. ·Minimum Water Temperature: 40oF. ·Maximum Water Temperature: 100oF. ·60 Hz Voltage may vary between 104 and 126 volts. ·Water Pressure may vary between 20 and 80 psi. Operating the machine outside these conditions constitutes misuse and voids 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 parts and/of other components not specifically approved by Scotsman. Scotsman reserves the right to make design changes and/or improvements at any time. Specifications and designs are subject to change without notice . Model Dimensions H' x W" x D" AFE325AE-1A 33 x 36 1/16 x 24 AFE325AE-6A 33 x 36 1/16 x 24 Basic Electrical 115/60/1 230/50/1 Condenser Type Air Cooled Air Cooled Min. Circ. Max. Fuse Ampacity Size 10.7 15 5.4 15 Refrigerant Charge (R-134a) 11 oz. 11 oz. August 1994 Page 2 AFE325 To The Installer: A professional installation of any product is critical to the long term satisfaction of the user. The AFE325 is designed to be installed indoors, near a drain. Determine the location from the anticipated use and any options planned for. This air cooled machine blows air out the back and left sides of the cabinet. Do not install the machine where the air flow might be blocked. The machine will require electrical power, water and a drain. Follow all local codes. Rough in the utilities before placing the machine into position (see For The Electrician and For The Plumber). After uncrating, install the legs or optional casters. If the building's drain is a floor drain near the machine, the cabinet can be placed on the floor and sealed around the edges. Place the cabinet in the place where it will be operating. Note that the electrical and water connections need to be made. Level the unit front to back and left to right. Water Quality: The quality of the water supplied to the machine will directly affect the purity of the ice and the reliability of the machine. While the condition of the water supplied to a building is normally out of the control of the user, water can be treated at the point of use. There are two major types of water impurities: suspended solids (those that are carried along with the water and may be filtered out) and dissolved solids (those that are part of the water and have to be treated). A water filter is always a good idea, but does require regular maintenance to change the cartridge. In some water conditions, water treatment may be required. Generally this means a polyphosphate feeder of some kind. Water softeners are not recommended for the AFE325. Nameplate Is Located On The Back Panel. Warm Air Out Utility Connections Here Airflow Direction Cool Air In Warm Air Out August 1994 Page 3 AFE325 For The Plumber Drains: The ice maker requires a gravity drain for the reservoir overflow and bin drain. The pitch on the drain tubes must be at least 1/4 inch fall per foot of horizontal run. On long horizontal runs, a vent at the back of the cabinet will improve draining, and is recommended. Water supply: Connect cold, potable water to the machine. A hand valve near the location is recommended. A water filter is also a good idea. Follow all local codes. There are two drains and one water inlet connection to make. The drains are: a copper bin drain tube; and a rubber reservoir overflow tube. The water inlet connection is a 3/8" male flare. Route a drain line to the reservoir overflow drain hose. Route a separate drain to the bin drain tube. Route the inlet water line to the fitting on the corner post. Water Inlet 3/8" Male Flare 7/16" Drain I.D. Flexible Hose January 2005 Page 4 AFE325 For The Electrician Electrical connections: Follow All Local, State & National Codes Check the nameplate for voltage and current requirements. An electrical cord is not supplied. Connect the AFE325 to a separate electrical circuit. Wiring to the machine must conform to all codes. A licensed electrician may be required in some situations. The electrical connection is made in the control box inside the machine. This unit must be grounded. Route the electrical power cord thru the corner post to the control box inside the cabinet. To make the electrical connection, remove the following parts: ·Top panel ·Bin door ·Rubber moulding ·Left moulding cover ·Left track ·Upper front panel ·Upper baffle ·Left side panel ·Front louvered panel ·Control box cover If the machine will be started up later, after making the electrical connections, replace all panels. Top Panel Electrical Inlet Control Box Cover Ice Discharge Tube (Ref) Upper Front Panel Bin Door Spacer Bin Door Serial Number Plate Left Track Left Side Panel Front Louvered Panel Upper Baffle Left Moulding Cover August 1994 Page 5 AFE325 Final Check List & Initial Start Up 1. Is the machine located indoors where the temperature limitations are not exceeded? 2. Is there at least 6" clearance on the left side and the back of the cabinet for adequate air flow? 3. Is the water supply adequate, and has a shut off valve been installed? 4. Is the cabinet level? 5. Have all of the electrical and drain connections been made? Initial Start Up 1. Remove the following parts: ·Top panel ·Bin door ·Rubber molding ·Left molding cover ·Left track ·Upper front panel ·Upper baffle ·Left side panel ·Front louvered panel ·Control box cover ·the top panel. 2. Open the water shut off valve. 3. Watch the water fill the reservoir. Check that it flows in and fills the reservoir near to the mark molded into the side of the reservoir. Check that the float shuts off the water flow when the tank is full. Check for leaks. Tighten hose clamps as needed. 4. Plug the unit in or switch on the electrical power. 5. Switch the master switch to ON. 6. Let the machine operate, listen for any unusual noises. If needed, reposition tubing & panels to eliminate vibration. After the unit has been operating for about 10 minutes, there should be enough ice in the bin to test the bin thermostat. 7. Pick up some ice and hold it up against the bottom of the ice thermostat tube. 8. After a short time the bin thermostat should switch the machine off. 9. Pour water into the bin and check that the drain does not leak but drains the water rapidly. 10. Replace all panels. 11. Explain to the user the maintenance requirements and operation of the machine. 12. Fill out the Warranty Registration and Customer Evaluation form. Mail it to Scotsman. 13. Leave the service manual with the owner/user and explain who should be called if service is needed. Note: For High Altitude Installations an Altitude Adjustment May Be Required: (11-0354-01, 20 Ranco brand bin thermostats only) Adjustment Altitude (ft. Amount of above seal level) adjustment from factory setting 2,000 4,000 6,000 8,000 35o 90o 145o 190o Range Screw CW August 1994 Page 6 AFE325 User Operation The AFE325 is an automatic ice flaked machine. All it requires is cool air, clean water, a drain, and an adequate supply of electrical power. The user must regularly sanitize and clean the machine. Component Location & Function Evaporator. This is a vertical cylinder full of water and refrigerated. Also in the cylinder is a slowly rotating auger. The auger forces the ice up the evaporator walls and compresses it at the top. The resulting flaked ice then falls by gravity into the ice storage bin. Water Reservoir. The water reservoir contains the inlet float valve and the water level sensor. The float valve controls the flow of water into the reservoir. Water Pressure Cut Out Switch: The purpose of this switch is to stop the ice maker if the water supply fails. Condenser. The AFE325 uses an air cooled condenser. It blows air out, away from the fan motor. The heat removed from the water is exhausted from the condenser. Compressor. The refrigeration system compressor provides the force to move the refrigerant around the system. Auger Drive. The auger drive is a direct drive gear reducer. August 1994 Page 7 AFE325 Component Location: Control Box Auger Delay Pressure Control: This pressure switch, connected to the low side of the refrigeration system, controls the auger drive motor. On-Off switch: This toggle switch shuts off the machine. It is not a complete disconnect. Bin Thermostat: This thermostat turns the machine on and off in response to changes in temperature of the capillary tube. It opens at 350 F. and closes at 450 F. The capillary tube is mounted on the inside of the ice chute. Toggle Switch Auger Delay Pressure Control Terminal Strip Bin Thermostat Control Box August 1994 Page 8 AFE325 Refrigeration System Operation The AFE325 uses a forced draft air cooled condenser, capillary tube and hermetic compressor. The system uses R-134a as a refrigerant. High pressure, high temperature refrigerant is forced thru the condenser where it looses enough heat to condense. The high pressure liquid refrigerant then passes thru the capillary tube which causes a pressure drop in the evaporator. As the high pressure liquid refrigerant moves into the evaporator's area of low pressure, the warm water and low pressure cause the refrigerant to evaporate and absorb heat from the metal walls of the evaporator. After the refrigerant has flowed thru the evaporator it goes back to the compressor thru the suction line as a low pressure vapor. At the compressor the cycle is repeated. The AFE325 uses a low side pressure control as a safety, it will shut the system down if the suction pressure is too low for reliable operation. System Characteristics: Note: This ice machin ...