AFE400 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 AFE400 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.
AFE400 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.
AFE400 For The Installer: Environmental Limitations The ice machine must be installed indoors in a controlled environment. Minimum Maximum Air Temp 0 50 F. 1000F. Water Temp 400F. 1000F. Water Pressure 20 PSI 80 PSI Voltage (60 Hz) 103.5 126.5 Voltage (50 Hz) 207 253 AIR IN AIR OUT 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.
AFE400 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.
AFE400 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.
AFE400 Installation For The Electrician This is a cord-connected unit, and must be on a separate single phase power supply. Check the nameplate for the correct voltage. 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.
AFE400 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. STEP 2 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.
AFE400 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.
AFE400 Electrical Sequence There are two circuits in the AFE400: one is a series circuit with several switches connected in series to the compressor. The other is a parallel branch of the series circuit, controlling the gear drive motor. • The series circuit begins at the contactor in the control box. From there, the line side power is connected to the Master Switch. • From the master switch the line side power is connected to the High Pressure Cut Out (water cooled).
AFE400 Initial Start Up After the final check list has been gone through, the ice machine may be started up. 1. Open the water shut off valve and allow the reservoir to fill with water. The ice machine will not operate without 20 pounds of water pressure. Note: The reservoir cannot be seen without removing the hood and cover plate, do not adjust float level unless the float does not shut off or overflows out the drain. 2. Remove two screws and the right grill. 3.
AFE400 Maintenance and Cleaning Cleaning Schedule: • Scrub the outside and inside of the cabinet once a week with soap and water. • Sanitize the bin interior once a month. • Clean the water system and air cooled condenser a minimum of twice per year. If in an area of high mineral concentration in the water supply, clean water system 4 times a year. This ice machine will perform at its best when kept clean.
AFE400 Maintenance and Cleaning Cleaning Water System: The water system is cleaned by pumping a mixture of water and Scotsman Ice Machine Cleaner through the water reservoir into the evaporator and into the ice storage bin as ice. 15. Pour the cleaning solution into the reservoir until it is full and wait 20 minutes. POURING CLEANING SOLUTION INTO RESERVOIR 1. Locate the master switch, and move it to the OFF position. 2. Empty the bin of ice. 3. Locate knobs holding hood to bin and remove them. 4.
AFE400 Maintenance and Cleaning The interior liner of the bin is in contact with a food grade product: ice. The storage bin must be cleaned regularly to maintain a sanitary environment. Once a week cleaning with soap and water, a hot water rinse and an air dry is a basic procedure. Scale that may form on the plastic liner can be removed by scrubbing the surface with a mixture of Scotsman Ice Machine Cleaner and hot water. Remove any scale prior to cleaning. To Remove Scale: 1.
AFE400 Maintenance and Cleaning Evaporator and Auger Ice Breaker and Auger Removal for Inspection The bearings and water seal should be checked once per year. Note: The auger can’t be pulled out when the unit is installed under the counter. Water Seal and Bearing Inspection: 1. Remove the hood, door and ice storage bin. 1. Remove the hood, door and ice storage bin. 2. Remove stainless steel cover plate. 2.
AFE400 Water Schematic: Water flows into the ice machine from its inlet connection at the back of the cabinet, through the float valve and into the reservoir. The water in the reservoir then flows by gravity into the bottom of the evaporator. In the evaporator the water chills into ice crystals and is pushed up the evaporator by the auger. At the top of the evaporator, the ice is pressed against a restriction, called a breaker, and some of the water is squeezed out of the crystalline ice.
AFE400 Refrigeration Schematic: From the compressor, hot discharge gas is pumped to the condenser, either air or water cooled. From the evaporator, the refrigerant flows back to the compressor through the suction line. At the condenser, heat from the refrigerant flows into the cooling medium, either air or water, and the refrigerant condenses into a liquid. From the condenser the liquid refrigerant flows through the liquid line to the metering device - a thermostatic expansion valve.
AFE400 Technical Characteristics Typical Low Side Pressure: • 12 PSIG Typical Discharge Pressure • 125 PSIG at 70oF. room air temperature (air cooled) & 50 oF. water • 160 PSIG at 90oF. room air temperature (air cooled) & 70 oF. water • 135 PSIG water cooled. Refrigerant Type • R-134a Refrigerant Charge: • 15 ounces air cooled. • 10 ounces water cooled. Hi Pressure Cut Out Point: • 250 PSIG Typical Compressor Amp Draw • Compressor amps should be about 6 - 7. Superheat • 6-8o F.
AFE400 Service Diagnosis: Condition - No Ice Being Produced STATUS: ICE MAKER DOES NOT OPERATE A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. If the voltage is correct and the unit will not start, go to B. B. Check: The master switch, switch ON if off. If the unit does not start go to C. C. Check: The reset switch, (high pressure): depress and release the high pressure reset switch. If the unit still does not start, go to D.
AFE400 Service Diagnosis: Condition - No Ice Being Produced STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT Check the compressor 1. Check the compressor start relay. 2. Check the overload. It could be open due to too much heat or too many amps. Too much heat could b e too much superheat or not enough refrigerant to cool the compressor. Too many amps could be a relay or internal compressor problem. 3. Check the start capacitor. if its open, the compressor will not start. 4.
AFE400 Removal And Replacement Bin Thermostat The bin thermostat controls the On and Off operation of the ice machine. The machine may take a long time to come on if the cabinet is in a cold environment. Do not change a bin thermostat because of reaction time if the ambient temperatures are extreme. It should be changed if, when ice is placed on the tube holder, it does not open within 2 minutes. It should also be changed if, when ice is removed from the tube holder, it does not ever re-close.
AFE400 Removal And Replacement Ice Breaker and Auger Removal Water Seal Installation Note: When the unit is installed under the counter, there is not enough room to remove the auger unless the evaporator is dismounted from the gearmotor or the ice machine is pulled out from under the counter. Inspect the water seal in it’s package. Do no use if mating surfaces are scratched or cracked. 1. Remove auger, unbolt evaporator from adaptor stand. Drive out old bottom bearing and water seal from the top down. 2.
AFE400 Removal And Replacement: Gearmotor Assembly Rebuilding The Gearmotor Assembly Removal of the Gearmotor Assembly Drive Motor Parts: 1. Remove the hood, door and ice storage bin.. To replace the centrifugal switch and mechanism or the motor winding or the motor rotor, removal of the gearbox assembly is not necessary. 2. Remove the evaporator and reservoir cover plate. 1. Disconnect electrical power. 3. Unscrew the bolts holding the gearmotor mounting plate to the ice machine chassis. 4.
AFE400 Removal And Replacement: Gearmotor Assembly Note: Some bearing grease should be placed in all bearings before assembly to insure proper lubrication upon start up. 4. Bench test the gearmotor assembly. Reassembly Return the gearmotor assembly to the unit. Be certain all mounting surfaces are clean and reassemble to the gearmotor mounting plate. Then bolt back onto ice machine chassis. 1. Set top gearcase on gears and spacers and oil. Be sure O-ring is in place. 2.
AFE400 Removal and Replacement Evaporator: The evaporator may be removed from the ice machine without removing the ice machine from its installed position. The evaporator should only need to be replaced if there is a refrigerant leak in the jacket or it has become worn or pitted internally. Electrical shock hazard. Electrical shock can cause personal injury. Disconnect power before beginning to service components. 12.
AFE400 Removal and Replacement: Refrigeration System If the refrigeration system must be serviced, the quality of service must insure that there will not be a repeat failure, as repeat failures will cause refrigerant to be discharged into the air by the failure or when the failure is corrected: The access valves are at the front of the cabinet, behind the left grill. To use them, remove the cap from the stem, and using an 3/16" allen wrench, check that the valve is CLOSED.
PS-14-91 October 1991 SERVICE BULLETIN SUBJECT: Ranco Thermostat Altitude Adjustment Scotsman currently specifies the Ranco brand of thermostat for use in its ice machines. Some of the thermostats are not adjustable, but do have an adjustment for altitude. This table describes that adjustment. The altitude refers to the location of the ice machine. The amount of adjustment is in degrees of rotation of the adjustment screw. Thermostat Part Number Adjustment Altitude (ft.
PS-14-91 October 1991 SERVICE BULLETIN SUBJECT: Ranco Thermostat Altitude Adjustment Scotsman currently specifies the Ranco brand of thermostat for use in its ice machines. Some of the thermostats are not adjustable, but do have an adjustment for altitude. This table describes that adjustment. The altitude refers to the location of the ice machine. The amount of adjustment is in degrees of rotation of the adjustment screw. Thermostat Part Number Adjustment Altitude (ft.
PS-5-93 July, 1993 SERVICE BULLETIN SUBJECT: Small Flaker Coupling Noise The correct diagnosis of any service problem is critical to making a correct repair. When small flakers (those using the 1⁄10 H.P. gearmotor - models such as AF1, AF325, FD470, and MF400) produce a "clicking" or "snapping" sound, one of the most likely possible problems is mis-alignment between the auger shaft and the gearmotor output shaft.
