Hoshizaki FM-251AFE Service Manual
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Hoshizaki FM-251AFE Service Manual

Hoshizaki FM-251AFE Service Manual

Hoshizaki modular ice makers service manual
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See also: Instruction Manual , Installation Manual
MODULAR ICE MAKER
MODEL
HOSHIZAKI
FM-251AFE(-N)
FM-251AWFE(-N)
FM-481AGE(-N)
FM-481AWGE(-N)
SERVICE MANUAL
NO.
E2BB-695
ISSUED: JAN. 24, 2006
REVISED: APR. 18, 2011

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Summary of Contents for Hoshizaki FM-251AFE

  • Page 1 NO. E2BB-695 ISSUED: JAN. 24, 2006 REVISED: APR. 18, 2011 HOSHIZAKI MODULAR ICE MAKER FM-251AFE(-N) MODEL FM-251AWFE(-N) FM-481AGE(-N) FM-481AWGE(-N) SERVICE MANUAL...

  • Page 2: Table Of Contents

    [d] FM-251AWFE-N ------------------------------------------------------------------------------6 [e] FM-481AGE ------------------------------------------------------------------------------------7 [f] FM-481AGE-N - ---------------------------------------------------------------------------------8 [g] FM-481AWGE ---------------------------------------------------------------------------------9 [h] FM-481AWGE-N ---------------------------------------------------------------------------- 10 [i] WITH STORAGE BIN (B-300_F) -------------------------------------------------------- 11 3. CONSTRUCTION - ------------------------------------------------------------------------------ 12 [a] FM-251AFE/AWFE(-N) - ------------------------------------------------------------------- 12 [b] FM-481AGE/AWGE(-N) - ------------------------------------------------------------------ 13 II. MAINTENANCE AND CLEANING INSTRUCTIONS - -------------------------------------- 14 1. EXTRUDING HEAD (UPPER BEARING), HOUSING (LOWER BEARING) - ---- 14 2. MECHANICAL SEAL --------------------------------------------------------------------------- 14 3. GEAR MOTOR ---------------------------------------------------------------------------------- 15 4. CONDENSER - ----------------------------------------------------------------------------------- 15 5. AIR FILTER (AIR-COOLED MODEL ONLY) --------------------------------------------- 15 6. WATER VALVE ---------------------------------------------------------------------------------- 16...
  • Page 3 [e] CONTROLLER BOARD------------------------------------------------------------------- 58 [f] SURGE ABSORBER ----------------------------------------------------------------------- 59 [g] CAPACITOR - XY FILTER - --------------------------------------------------------------- 59 [h] BIN CONTROL SWITCH ----------------------------------------------------------------- 59 [i] CHUTE SWITCH - ---------------------------------------------------------------------------- 60 [j] DEICING HEATER (BELT HEATER) --------------------------------------------------- 60 7. OPERATION BOARD -------------------------------------------------------------------------- 61 [a] USER OPERATION ------------------------------------------------------------------------ 61 [b] SERVICE OPERATION ------------------------------------------------------------------- 61 8. PROTECTORS ---------------------------------------------------------------------------------- 65 [a] INDICATION --------------------------------------------------------------------------------- 65 [b] PROTECTORS - ----------------------------------------------------------------------------- 65 9. ERROR CODES - -------------------------------------------------------------------------------- 68 10. PERFORMANCE DATA ----------------------------------------------------------------------- 70 [a] FM-251AFE ---------------------------------------------------------------------------------- 70 [b] FM-251AFE-N ------------------------------------------------------------------------------- 71...
  • Page 4 [c] FM-251AWFE - ------------------------------------------------------------------------------- 72 [d] FM-251AWFE-N ---------------------------------------------------------------------------- 73 [e] FM-481AGE ---------------------------------------------------------------------------------- 74 [f] FM-481AGE-N - ------------------------------------------------------------------------------- 75 [g] FM-481AWGE ------------------------------------------------------------------------------- 76 [h] FM-481AWGE-N ---------------------------------------------------------------------------- 77 IV. SERVICE DIAGNOSIS - --------------------------------------------------------------------------- 78 1. NO ICE PRODUCTION - ----------------------------------------------------------------------- 78 2. LOW ICE PRODUCTION --------------------------------------------------------------------- 80 3. OTHERS ------------------------------------------------------------------------------------------ 80 V. REMOVAL AND REPLACEMENT OF COMPONENTS ----------------------------------- 82 1. SERVICE FOR REFRIGERANT LINES - -------------------------------------------------- 82 [a] SERVICE INFORMATION - --------------------------------------------------------------- 82 [b] REFRIGERANT RECOVERY------------------------------------------------------------ 83 [c] EVACUATION AND RECHARGE - ------------------------------------------------------ 83 2. BRAZING - ----------------------------------------------------------------------------------------- 84 3. COMPRESSOR --------------------------------------------------------------------------------- 85...

  • Page 5: Specifications

    I. SPECIFICATIONS 1. FEATURES [a] LOW VOLTAGE When the supply voltage is too low or surrounding high-current equipment starts up, the voltage in the icemaker may drop temporarily. In this case, the Compressor will fail to start, or the Gear Motor will lock during the icemaking operation. The locked Gear Motor may apply the maximum torque to the icemaking mechanism and damage its parts.

  • Page 6: [F] Other Information

    [f] OTHER INFORMATION Other information is also available from the Controller Board. See “III. 7. OPERATION BOARD” for details. [g] CHANGE OF ICE TYPE With the older models, changes between flake ice and nugget ice were available by replacing the Extruding Head and Cutter. With the new models, not only the Extruding Head and Cutter but also the refrigeration circuit is different between the flake ice model and nugget ice model.

  • Page 7: Dimensions/Specifications

    2. DIMENSIONS/SPECIFICATIONS [a] FM-251AFE...

  • Page 8: [B] Fm-251Afe

    [b] FM-251AFE-N...

  • Page 9: [C] Fm-251Awfe

    [c] FM-251AWFE...

  • Page 10: [D] Fm-251Awfe

    [d] FM-251AWFE-N...

  • Page 11: [E] Fm-481Age

    [e] FM-481AGE...

  • Page 12: [F] Fm-481Age

    [f] FM-481AGE-N...

  • Page 13: [G] Fm-481Awge

    [g] FM-481AWGE...

  • Page 14: [H] Fm-481Awge-N

    [h] FM-481AWGE-N...

  • Page 15: [I] With Storage Bin (B-300_F)

    [i] WITH STORAGE BIN (B-300_F)

  • Page 16: Construction

    3. CONSTRUCTION Modular flaker models FM-251AFE/AWFE(-N) and FM-481AGE/AWGE(-N) include Water Supply, Evaporator, Compressor, Condenser and Control Assemblies. As the unit is not equipped with an Ice Storage Bin, this must be purchased separately as an optional extra. [a] FM-251AFE/AWFE(-N) Control Box...

  • Page 17: [B] Fm-481Age/Awge(-N)

    [b] FM-481AGE/AWGE(-N) Pressure Switch Control Box Evaporator Gear Motor Flush Water Valve Ice Chute Control Water Valve Reservoir Compressor Drier...

  • Page 18: Maintenance And Cleaning Instructions

    II. MAINTENANCE AND CLEANING INSTRUCTIONS IMPORTANT 1. This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. 2. To achieve optimum icemaker performance, the following parts need periodic inspection and maintenance: Extruding head (upper bearing) Housing (lower bearing) Mechanical seal These parts should be inspected after two years from installation or 10,000...

  • Page 19: Gear Motor

    Total operation time Water leakage 3,000 hours 0.1 mL/h 10,000 hours 0.5 mL/h Note: The water leakage will exceed the above amount with scale/dirt build up or damage on the mating surface. Replace the mechanical seal when the water leakage exceeds 0.5 mL/h.

  • Page 20: Water Valve

    6. WATER VALVE 1) Disconnect the power source. 2) Close the water supply tap. 3) Disconnect the Inlet Hose from the Water Valve. 4) Remove the Mesh Filter from the Water Valve. 5) Clean the Mesh using a brush. 6) Replace the Mesh and Inlet Hose in their correct positions. 7) Open the water supply tap.

  • Page 21: Cleaning Of Water System

    7. CLEANING OF WATER SYSTEM WARNING 1. HOSHIZAKI recommends cleaning this unit at least twice a year. More frequent cleaning, however, may be required in some existing water conditions. 2. Do not touch the Operation Switch with damp hands. 3. Always wear rubber gloves, eye protectors, apron, etc. for safe handling of the cleaner and sanitiser.
  • Page 22 2) Press the Stop Button to activate the flush cycle (approx. 10 minutes). 3) Remove all ice from the Storage Bin to avoid contamination by the cleaner. 4) Unplug the icemaker. Remove the Top and Front Panels. 5) Remove the Cover of the Reservoir. Remove any loose debris or scale. 6) Carefully fill the Reservoir with the solution to the overflow point.

  • Page 23: Periodical Cleaning

    5) Rinse thoroughly with fresh water and a clean cloth to wipe off the solution. Close the Bin Door. Note: Some solutions may cause damage to the Bin liner surfaces or corrosion on the metal parts. Always rinse the sanitiser unless directed otherwise by Hoshizaki guidelines.

  • Page 24: Technical Information

    III. TECHNICAL INFORMATION 1. WATER CIRCUIT AND REFRIGERANT CIRCUIT [a] FM-251AFE(-N) Pressure Switch Cut-out 28.5 ± 1.5/0 bar Cut-in 23.0 ± 1.5 bar...

  • Page 25: [B] Fm-251Awfe(-N)

    [b] FM-251AWFE(-N) Pressure Switch Cut-out 28.0 ± 1.5/0 bar Cut-in 23.0 ± 1.5 bar...

  • Page 26: [C] Fm-481Age(-N)

    [c] FM-481AGE(-N) Pressure Switch Cut-out 28.5 ± 1.5/0 bar Cut-in 23.0 ± 1.5 bar...

  • Page 27: [D] Fm-481Awge(-N)

    [d] FM-481AWGE(-N) Pressure Switch Cut-out 22.0 ± 1.5/0 bar Cut-in 18.0 ± 1.5 bar...

  • Page 28: Wiring Diagram

    2. WIRING DIAGRAM [a] WIRING DIAGRAM FM-251AFE(-N), FM-251AWFE(-N)
  • Page 29 FM-481AGE(-N)
  • Page 30 FM-481AWGE(-N)

  • Page 31: [B] Control Box Layout

    [b] CONTROL BOX LAYOUT FM-251AFE(-N), FM-251AWFE(-N)
  • Page 32 FM-481AGE(-N)
  • Page 33 FM-481AWGE(-N)

  • Page 34: Icemaking Mechanism

    3. ICEMAKING MECHANISM SEALING BOLT [a] EVAPORATOR (CASING) The Evaporator consists of a stainless steel icemaking cylinder coiled with a refrigeration pipe and wrapped together with a polyurethane foam insulation material. Water coming from the inlet into the Evaporator will be frozen into ice. The Ice Spout is located on top of the Evaporator.

  • Page 35: [C] Extruding Head (Bearing)

    [c] EXTRUDING HEAD (BEARING) The stainless steel Extruding Head is provided with a press-fit plastic Bearing inside and fixed on top of the Evaporator. The Extruding Head functions as the Auger Bearing and compresses the sherbet ice carried up by the Auger into a column shape with the path resistance.

  • Page 36: [J] Sealing Bolt

    [j] SEALING BOLT Sometimes the icemaking operation may produce white solids on the Drip Pan. They are deposits of silica and calcium contents in the icemaking water leaking from the sealing bolt. The bolt is provided with retaining and sealing functions, which may be reduced by the load and vibration during a freeze cycle.

  • Page 37: [D] Flush Water Valve

    bar at the water supply inlet, the built-in flow controller maintains almost the same water flow (24V AC). [d] FLUSH WATER VALVE When the Flush Timer operates or the Stop Button is pressed to shut down the icemaker, the Flush Water Valve will be energized to open and flush out the Evaporator Casing and Reservoir (21.7V DC).

  • Page 38: Refrigeration Circuit

    If the icemaker is shut down, the Water Regulator is closed with a low condensing pressure. Sending air in this condition will not drain the water from the Condenser. 5. REFRIGERATION CIRCUIT [a] APPLICABLE PARTS FM-251AFE(-N) FM-251AWFE(-N) FM-481AGE(-N) FM-481AWGE(-N) Refrigerant (R404A) Compressor...

  • Page 39: [C] Refrigerant

    [c] REFRIGERANT The icemaker employs refrigerant R404A which itself is not flammable or poisonous. However, a small room filled with R404A may cause suffocation with a lack of oxygen. Also, when exposed to an open flame, R404A creates Phosgene gas, hazardous in large amounts.

  • Page 40: [G] Condenser Cooling Fan Motor

    b) Water-cooled Condenser (Tube-in-tube type) Cooling water flows in the inner tube and refrigerant gas flows in the outer tube in opposite directions (counterflow) for efficient heat exchange. The valve position of the Water Regulator is automatically controlled to regulate the discharge pressure in the refrigerant circuit and change the flow rate of cooling water.

  • Page 41: [H] Water Regulator

    [h] WATER REGULATOR - WATER-COOLED MODEL ONLY The Water Regulator controls the water flow in the Water-cooled Condenser to maintain a certain level of the discharge pressure. The discharge pressure may rise at startup but stabilize in 30 minutes. The Water Regulator is factory-adjusted. No adjustment is required under normal use except for replacement of the FM-251AWFE(-N) or FM-481AWGE(-N) Water Regulator.

  • Page 42: Electric Circuit

    valve position to regulate the superheat (difference between evaporating temperature and suction gas temperature). No superheat control is available from outside. To check the Expansion Valve for proper operation, remove the Bulb while the Compressor is running. If the suction pressure rises, the Expansion Valve is working normally. Note: Do not leave the Bulb removed for a long time while the Compressor is running.

  • Page 44: [C] Sequence

    [c] SEQUENCE FM-251AFE(-N), FM-251AWFE(-N) (1) Startup - Water Supply...
  • Page 45 FM-251AFE(-N) , FM-251AWFE(-N) (2) Startup - After completion of water supply, Gear Motor and Fan Motor start (5 min).
  • Page 46 FM-251AFE(-N) , FM-251AWFE(-N) (3) Startup - Ice production starts...
  • Page 47 FM-251AFE(-N) , FM-251AWFE(-N) (4) Normal Operation - Bin Control...
  • Page 48 FM-251AFE(-N) , FM-251AWFE(-N) (5) Shutdown - Compressor stops (5 min)
  • Page 49 FM-251AFE(-N) , FM-251AWFE(-N) (6) Shutdown - Drain...
  • Page 50 FM-481AGE(-N) (1) Startup - Water Supply...
  • Page 51 FM-481AGE(-N) (2) Startup - After completion of water supply, Gear Motor and Fan Motor start (5 min).
  • Page 52 FM-481AGE(-N) (3) Startup - Ice production starts...
  • Page 53 FM-481AGE(-N) (4) Normal Operation - Bin Control...
  • Page 54 FM-481AGE(-N) (5) Shutdown - Compressor stops (5 min)
  • Page 55 FM-481AGE(-N) (6) Shutdown - Drain...
  • Page 56 FM-481AWGE(-N) (1) Startup - Water Supply...
  • Page 57 FM-481AWGE(-N) (2) Startup - After completion of water supply, Gear Motor and Fan Motor start (5 min).
  • Page 58 FM-481AWGE(-N) (3) Startup - Ice production starts...
  • Page 59 FM-481AWGE(-N) (4) Normal Operation - Bin Control...
  • Page 60 FM-481AWGE(-N) (5) Shutdown - Compressor stops (5 min)
  • Page 61 FM-481AWGE(-N) (6) Shutdown - Drain...

  • Page 62: [D] Operation Board

    [d] OPERATION BOARD The Operation Board is provided for operation of the icemaker. See “7. OPERATION BOARD” for details. [e] CONTROLLER BOARD The icemaker is controlled by the Controller Board based on the following logic: 1) Low Voltage Standby In a low voltage condition, the Compressor and Gear Motor may fail to start or rotate properly due to insufficient torque.

  • Page 63: [F] Surge Absorber

    [f] SURGE ABSORBER The Surge Absorber is provided to protect the Controller Board from lightning. [g] CAPACITOR - XY FILTER The Capacitor - XY Filter is provided to prevent the Controller Board from signal errors caused by internal and external noises.

  • Page 64: [I] Chute Switch

    [i] CHUTE SWITCH The Chute Switch consists of a microswitch and a band securing the Spout and Chute. When the Bin Control Switch breaks down, the band opens and presses the button on the microswitch (contacts open) to stop the icemaker (error code: EL). To restart the icemaker, remove ice from the Spout and Chute, and move the Operation Switch to the “STOP”...

  • Page 65: Operation Board

    7. OPERATION BOARD Visible from Window Panel [a] USER OPERATION (accessible from the Window Panel) ICE = When pressed in the STOP mode, the unit will be supplied with water and start icemaking operation. STOP = When pressed in the ICE mode, the unit will stop icemaking operation and drain. RESET = When pressed during shutdown with an error code displayed, the unit may restart icemaking operation.
  • Page 66 Press the Set Button again to complete the setting and start icemaking operation in the ICE mode. 2) Displaying Model Setting No. Keep pressing the Option Button in the ICE or STOP mode. The Display Window will show the compressor operating hours ([b] - 3). Press and release the Ice Button.
  • Page 67 6) Displaying Ongoing Error Keep pressing the Option Button in the ICE or STOP mode. The Display Window will show the compressor operating hours ([b] - 3). Press and release the Stop Button to display the error record ([b] - 5). The most recent errors will be displayed in reverse order of occurrence.
  • Page 68 The numerals and/or letters will appear in the following order: GM locking detected by current + GM hunting detected by current + (Low GM rotation speed + High GM current + Voltage above low voltage sensor reset level) GM locking detected by current GM hunting detected by current Low GM rotation speed + High GM current + Voltage above low voltage sensor reset level...

  • Page 69: Protectors

    10) Reducing Compressor Startup Time With the Operation Switch in the OFF position, keep pressing the Option Button, and turn ON the Operation Switch. Release the Option Button when the Display Window shows the ICE mode. The Compressor will start up about 30 seconds after completion of water supply. 8.
  • Page 70 2) Gear Motor Rotation Sensor Counts the motor rotation time in every cycle. Controls to reduce the load by flowing hot gas when the rotation slows down. Shuts down the icemaker when the rotation slows down further. Thermal Protector Provided on the motor coil. Operates when the motor temperature rises. The protector is auto-reset, but the controller shuts down the icemaker.
  • Page 71 8) Water Leak Detects a water leak if the water level goes down with the Compressor out of operation after the first water supply cycle (i.e. no ice production). “E0” will appear in the Display Window. 9) Float Switch The Float Switch or connector may have a bad contact if the Float Switch trips at the upper float level but not at the lower float level with the Flush Water Valve closed.

  • Page 72: Interlock Errors

    9. ERROR CODES Interlock Errors Code Error Condition Operation Reset Check/Repair Following initial water supply, Float Switch trips at Water leak, Flush Icemaking Whole unit Press Reset lower float level after Gear Water Valve not Water Leak stops. Button. Motor starts and before closing, Float Switch Compressor starts.
  • Page 73 Code Error Condition Operation Reset Check/Repair Frequent c3 error occurs 3 times in Whole unit Press Reset Supply voltage Voltage Error 24 hours. stops. Button. Gear Motor Ed and EE occur 10 times Replace Evaporator Failure EJ blinks. in total. and Gear Motor.

  • Page 74: Performance Data

    10. PERFORMANCE DATA [a] FM-251AFE Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 75: [B] Fm-251Afe-N

    [b] FM-251AFE-N Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 76: [C] Fm-251Awfe

    [c] FM-251AWFE Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 77: [D] Fm-251Awfe-N

    [d] FM-251AWFE-N Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 78: [E] Fm-481Age

    [e] FM-481AGE Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 79: [F] Fm-481Age-N

    [f] FM-481AGE-N Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 80: [G] Fm-481Awge

    [g] FM-481AWGE Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 81: [H] Fm-481Awge-N

    [h] FM-481AWGE-N Head Pressure(bar) Suction Pressure(bar) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) Ice Production Capacity(kg/day) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C) 10/10 21/15 32/21 Ambient Temp/Water Temp(°C)

  • Page 82: Service Diagnosis

    IV. SERVICE DIAGNOSIS Display error record by operating the Operation Board (See “III. 7. [b] 5) Displaying Error Record”). Check for a possible cause and service the unit. 1. NO ICE PRODUCTION PROBLEM POSSIBLE CAUSE REMEDY [1] The icemaker a) Power Supply 1.
  • Page 83 PROBLEM POSSIBLE CAUSE REMEDY [3] (Continued) b) Gear Motor 1. Tripped. 1. Find out the cause, resolve it, Protector and press Reset Button on (Thermal Motor Protector. Breaker) c) Controller Board 1. Broken. 1. Replace. d) Pressure Switch 1. Dirty Condenser fins. 1.

  • Page 84: Low Ice Production

    2. LOW ICE PRODUCTION PROBLEM POSSIBLE CAUSE REMEDY [1] Low ice a) Refrigerant Line 1. Gas leaks. 1. See 1 - [5] - a). production. 2. Refrigerant line 2. Replace the clogged clogged. component. 3. Overcharged. 3. Recharge. b) High-side 1.
  • Page 85 PROBLEM POSSIBLE CAUSE REMEDY [2] Overflow from a) Water Supply 1. Water pressure too 1. Install a Pressure Reducing Reservoir (Water high. Valve. does not stop.) b) Water Valve 1. Diaphragm does not 1. Clean or replace. close. c) Float Switch 1.

  • Page 86: Removal And Replacement Of Components

    V. REMOVAL AND REPLACEMENT OF COMPONENTS 1. SERVICE FOR REFRIGERANT LINES [a] SERVICE INFORMATION 1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R404A] The compressor must not be opened more than 30 minutes in replacement or service. Do not mix lubricants of different compressors even if both are charged with the same refrigerant, except when they use the same lubricant.

  • Page 87: [B] Refrigerant Recovery

    7) Evacuation, Vacuum Pump and Refrigerant Charge [R404A] Never allow the oil in the vacuum pump to flow backward. The vacuum level and vacuum pump may be the same as those for the current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for R404A.

  • Page 88: Brazing

    7) Turn on the icemaker. Release the High-side Access Connector, and allow pressure in the charging line to slowly enter the low side of the system. Cap off the High- side Access Valve. When pressure reduces on the low side, disconnect the low side charging line and cap off the Access Valve.

  • Page 89: Compressor

    3. COMPRESSOR IMPORTANT Always install a new Drier every time the sealed refrigeration system is opened. Do not replace the Drier until after all other repair or replacement has been made. 1) Disconnect the power source. 2) Remove the panels. 3) Remove the Terminal Cover on the Compressor, and disconnect the Compressor wiring.

  • Page 90: Drier

    15) Evacuate the system, and charge it with refrigerant. See the Nameplate for the required refrigerant charge (See “1. [c] EVACUATION AND RECHARGE”). 16) Connect the Terminals to the Compressor, and replace the Terminal Cover in its correct position. 17) Refit the panels in their correct position. 18) Connect the power source.

  • Page 91: Expansion Valve

    5. EXPANSION VALVE IMPORTANT Sometimes moisture in the refrigerant circuit exceeds the Drier capacity and freezes up at the Expansion Valve. Always install a new Drier every time the sealed refrigeration system is opened. Do not replace the Drier until after all other repair or replacement has been made.

  • Page 92: Water Regulating Valve - Water-Cooled Model Only

    6. WATER REGULATING VALVE - WATER-COOLED MODEL ONLY IMPORTANT Always install a new Drier every time the sealed refrigeration system is opened. Do not replace the Drier until after all other repair or replacement has been made. 1) Unplug the icemaker. 2) Close the water supply tap.

  • Page 93: Evaporator Assembly

    7. EVAPORATOR ASSEMBLY 1) Push the Stop Button to drain the water in the Evaporator. 2) Disconnect the power source. 3) Remove the panels. 4) Remove the Band connecting the Spout with the Chute Assembly. 5) Remove the three Thumbscrews, and take off the Spout from the Evaporator. CUTTER 6) Remove the Bolt and lift off the Cutter.
  • Page 94 12) Recover the refrigerant and store it in a proper container, if required by an applicable law (See "1. [b] REFRIGERANT RECOVERY"). IMPORTANT Always install a new Drier every time the sealed refrigeration system is opened. Do not replace the Drier until after all other repair or replacement has been made.
  • Page 95 GEAR MOTOR 22) Cut the Connectors. 23) Remove the three Socket Head Cap Screws securing the Gear Motor. 24) Assemble the removed parts in the reverse order of which they were removed. WARNING Be careful not to scratch the surface of the O-ring, or it may cause water leaks.
  • Page 96 (FM-251AFE) (FM-251AFE-N) (FM-251AWFE) (FM-251AWFE-N) (FM-481AGE) (FM-481AGE-N) (FM-481AWGE) (FM-481AWGE-N) Rubber O-ring Rubber O-ring Nylon Ring Nylon Ring Screw Screw Cutter Cutter Extruding Extruding Head Head Dowel Pin Flange Sealing Bolt Auger Belt Heater [FM-481AGE-N/ AWGE-N only] Mechanical Seal O-ring Housing Evaporator...

  • Page 97: Control Water Valve

    8. CONTROL WATER VALVE 1) Disconnect the power source. 2) Close the water supply tap. 3) Remove the panels. 4) Disconnect the Terminals from the Control Water Valve. 5) Remove the Cover - Reservoir Inlet from the Control Water Valve. 6) Loosen the Fitting Nut on the Control Water Valve Inlets, and remove the Control Water Valve.

  • Page 98: Flush Water Valve

    9. FLUSH WATER VALVE 1) Close the water supply tap. 2) Remove the panels. 3) Push the Stop Button, and after 5 minutes disconnect the power source. 4) Remove the Clamp and disconnect the Hose from the Flush Water Valve. Note: Water may still remain inside the Evaporator.

  • Page 99: Controller Board

    10. CONTROLLER BOARD IMPORTANT A single type Controller Board is supplied as a Service Board. Some modifications and adjustment will be required to fit the icemaker models. Do not repair any parts and electronic devices on the Controller Board in the field. Replace the whole board with a new Service Board.

This manual is also suitable for:

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