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1. Remove icemaker panels required to gain access to water reservoir' components (Fig. 5) and electrical control box. 2. Turn compressor switch on electrical box to OFF position. 3. Dispense all ice from dispenser. 4. Shut off water to icemaker. 5. Drain water from reservoir through float/evaporator drain line (Fig. 5.1). Reinsert hose into hose clip (Fig. 5.3). 6. Fill reservoir and evaporator (Fig. 5.2) with Solution A. 7. Verify compressor switch is in the off position. Restart icemaker and allow gearmotor to run for 15 minutes. 8. While waiting 15 minutes, follow steps 8a through 8c. a) Remove ice compression nozzle (Fig. 6.1). Soak in Solution A. Note: No compression nozzle on MFE400 series flake icemaker. b) Descale drain pans (Fig. 6.2) by grasping firmly and gently bending up and down. Vacuum residue out. c) Inspect all drain lines. Clean as necessary with Solution A (Fig. 5). 9. Disconnect icemaker power. 10. Drain Solution A through float/evaporator drain line (Fig. 5.3). Rinse evaporator by filling reservoir (Fig. 5.2) with potable water and draining evaporator through float/evaporator drain line (Fig. 5.3) three times. Reinsert hose into hose clip (Fig. 5.3) and insert plug into end of drain line (Fig. 5.1). 11. Connect ice transport tubes (Fig. 6.3) directly to evaporator outlet ports (without ice compression nozzle) (Fig 6.4). 12. Fill reservoir and evaporator (Fig. 5.2) with Solution B. 13. Rinse ice compression nozzle in clear water and submerge in cup of Solution B while performing steps 14 through 16. 14. Turn on bin signal switch in electrical box to allow gearmotor to run. 15. Wait 10 minutes. Turn compressor switch on. 16. Keep reservoir (Fig. 5.2) full of Solution B while making ice for 20 minutes. 17. Turn compressor switch off. 18. Rinse ice compression nozzle (Fig. 6.1) with water and reinstall. Note: No compression nozzle on MFE400 series flake icemaker. 19. Drain any remaining sanitizing solution from reservoir through float/evaporator drain line (Fig. 5.1). 20. Fill reservoir (Fig. 5.2) with 49°C (120°F) water. Empty water through float/evaporator drain line (Fig 5.3). Repeat 3 times. 21. Turn on water to icemaker. 22. Turn compressor switch on. 23. Replace reservoir cover and any panels removed to clean icemaker. 24. Make ice for 30 minutes. Dispense and discard all ice. 25. Clean and sanitize dispenser as outlined in dispenser operation and service manual. Fig. 6 1 3 2 1 2 3 4 18 Service Icemaker Operation Follett’s icemaker consists of four distinct functional systems: • Refrigeration system • Water system • Harvesting system • Electrical control system These four systems work together to accomplish the production and harvesting of ice. A problem in any one of these systems will result in improper operation of the entire ice production cycle. When troubleshooting the icemaker, it is important to analyze the entire system operation to determine which system is not functioning properly, then pinpoint the component within that system that is malfunctioning. Determine what corrective action must be taken before making any adjustments or replacing any components. The icemaking process The Follett icemaker uses a stainless steel jacketed evaporator and operates on a continuous freezing cycle. Water is supplied to the evaporator from the water reservoir where the water level is controlled by a float valve. This valve also shuts off the water supply when the icemaker is not running. When the icemaker is running, a Harvest system diagram layer of ice forms on the interior surface of the evaporator. This ice is continuously removed by a slowly rotating (12 RPM) auger. The auger carries the ice upward into the cavity formed by the top bearing housing and the compression loop, where it is compressed to remove excess water. When the ice reaches the desired hardness it rotates within the cavity and is forced through a discharge port and compression nozzle and into the ice transport tube. The discharge tube and compression nozzle are slightly restricted to further compress the ice and produce the desired hardness. As the formation of ice continues, ice in the transport tube is pushed through the tube to the storage compartment in the ice dispenser or ice storage bin. A solid state control board located in the electrical box of the icemaker controls the normal operation of the icemaker and monitors gearmotor torque. This control board will shut down the icemaker should an over-torque condition occur. It is very important that you familiarize yourself with the operational sequences detailed in this manual before attempting to service the icemaker. water inlet auger compression nozzle ice transport tube evaporator port 19 Technical specifications (all models) Refrigeration system diagram high side high pressure condenser filter dryer thermostatic expansion valve evaporator service port low side service port switch compressor high pressure vapor low pressure vapor high pressure liquid low pressu...

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