Hoshizaki F-450MAH Service Manual
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Hoshizaki F-450MAH Service Manual

Modular flaker
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Hoshizaki
Hoshizaki America, Inc.
Modular Flaker
Models
F-450MAH(-C)
SERVICE MANUAL
"A Superior Degree
of Reliability"
www.hoshizaki.com
Issued: 8-25-2009

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Summary of Contents for Hoshizaki F-450MAH

  • Page 1 Hoshizaki Hoshizaki America, Inc. Modular Flaker Models F-450MAH(-C) SERVICE MANUAL “A Superior Degree of Reliability” www.hoshizaki.com Issued: 8-25-2009...
  • Page 2 Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance. HOSHIZAKI AMERICA, INC.

  • Page 3: Table Of Contents

    Only qualified service technicians should service and maintain the icemaker. This manual should be made available to the technician prior to service or maintenance. I. Specifications ... 4 1. F-450MAH ... 4 2. F-450MAH-C ... 5 II. General Information ... 6 1. Construction ... 6 2.

  • Page 4: Specifications

    I. Specifications 1. F-450MAH AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR OTHER MAXIMUM FUSE SIZE MAX. HACR BREAKER (USA ONLY) MAX. CIRC. BREAKER (CANADA ONLY) MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks...

  • Page 5: F-450Mah-C

    2. F-450MAH-C AC SUPPLY VOLTAGE COMPRESSOR GEAR MOTOR FAN MOTOR OTHER MAXIMUM FUSE SIZE MAX. HACR BREAKER (USA ONLY) MAX. CIRC. BREAKER (CANADA ONLY) MINIMUM CIRCUIT AMPACITY APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks...

  • Page 6: General Information

    II. General Information 1. Construction Control Water Valve Bin Control Ice Chute Evaporator Flush Water Valve Control Box Gear Motor Water Supply Inlet Junction Box Condenser Fan Motor Compressor Drier...

  • Page 7: Control Box Layout

    2. Control Box Layout Note: The above component names are identical with the wiring label, but not with the parts list.

  • Page 8: Timer Board

    3. Timer Board [a] Solid-State Control 1) A HOSHIZAKI exclusive solid-state control is employed in the self-contained flaker icemakers. 2) A printed circuit board (hereafter called “timer board”) includes a stable and high quality control system. 3) All models are pre-tested and factory-adjusted.

  • Page 9: [C] Sequence

    Fig. 1 [c] Sequence Fig. 2...
  • Page 10 Fig. 3 ± ± ± ± ±...
  • Page 11 Functions of Terminals 1) Terminals 1, 2 Power supply AC 24V. 2) Terminals 3, 4 Control X (GM) and X When closed, energize X When opened, de-energize X 3) Terminals 5, 6 Control X (GM) and X When opened, de-energize X When closed again, energize X 4) Terminals 7, 8, 9 X1 (GM) contacts.

  • Page 12: Technical Information

    III. Technical Information 1. Water Circuit and Refrigeration Circuit...

  • Page 13: Wiring Diagram

    2. Wiring Diagram [a] F-450MAH...

  • Page 14: [B] F-450Mah-C

    [b] F-450MAH-C...

  • Page 15: Sequence Of Electrical Circuit

    3. Sequence of Electrical Circuit [a] When power switch is moved to “ON” position and flush switch to “ICE” position, water starts to be supplied to reservoir.
  • Page 16 [b] When reservoir has been filled, gear motor starts immediately.
  • Page 17 [c] Compressor starts about 60 sec. after gear motor starts.
  • Page 18 [d] Bin control operates, and about 6 sec. later, compressor and gear motor stop simultaneously.
  • Page 19 [e] Low water (except water-cooled model).
  • Page 20 [f] When flush switch is moved to “FLUSH” position, flush water valve opens and flushes reservoir and evaporator.
  • Page 21 [g] When flush timer operates (for 21 min. every 12 hours), flush water valve opens and flushes reservoir and evaporator.
  • Page 22 [h] When 208-230V are supplied to circuit protect relay, it protects the circuit from being miswired. If the power supply is properly connected, the contact of circuit protect relay does not move even when the coil is energized.
  • Page 23 [i] When pressure switch opens, power supply to the control board is cut off causing the compressor and gear motor to turn off immediately.
  • Page 24 [j] When input voltage is too low (less than 70%) gear motor fuse (1.5A) is blown causing compressor and gear motor to turn off immediately.

  • Page 25: Timing Chart

    4. Timing Chart 1. CIRCUIT PROTECT RELAY UPPER 2. WATER LEVEL LOWER BOTTOM UPPER 3. FLOAT SWITCH LOWER 4. WATER CONTROL RELAY 5. CONTROL WATER VALVE 1 - 2 6. FLUSH TIMER 2 - 3 FLUSH 7. FLUSH SWITCH 8. FLUSH WATER VALVE 9.
  • Page 26 1. CIRCUIT PROTECT RELAY UPPER 2. WATER LEVEL LOWER BOTTOM UPPER 3. FLOAT SWITCH LOWER 4. WATER CONTROL RELAY 5. CONTROL WATER VALVE 1 - 2 6. FLUSH TIMER 2 - 3 FLUSH 7. FLUSH SWITCH 8. FLUSH WATER VALVE 9.
  • Page 27 1. CIRCUIT PROTECT RELAY UPPER 2. WATER LEVEL LOWER BOTTOM UPPER 3. FLOAT SWITCH LOWER 4. WATER CONTROL RELAY 5. CONTROL WATER VALVE 1 - 2 6. FLUSH TIMER 2 - 3 FLUSH 7. FLUSH SWITCH 8. FLUSH WATER VALVE 9.

  • Page 28: Performance Data

    5. Performance Data [a] F-450MAH APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day kg/day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day l/day EVAPORATOR OUTLET TEMP °F °C HEAD PRESSURE PSIG kg/cm²G SUCTION PRESSURE PSIG kg/cm²G TOTAL HEAT OF REJECTION 4724 BTU/h (AT 90°F /WT 70°F) We reserve the right to make changes in specifications and design without prior notice.

  • Page 29: [B] F-450Mah-C

    [b] F-450MAH-C APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day kg/day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day l/day EVAPORATOR OUTLET TEMP °F °C HEAD PRESSURE PSIG kg/cm²G SUCTION PRESSURE PSIG kg/cm²G TOTAL HEAT OF REJECTION 5150 BTU/h (AT 90°F /WT 70°F) We reserve the right to make changes in specifications and design without prior notice.

  • Page 30: Service Diagnosis

    IV. Service Diagnosis 1. No Ice Production PROBLEM [1] The icemaker will a) Power Supply not start. b) Power Switch c) Fuse (Control Box) d) Circuit Protect Relay 1. Miswiring. e) Flush Timer g) Transformer h) Control Water Valve [2] Water does not a) Water Control Relay stop, and the icemaker will not...
  • Page 31 PROBLEM c) Gear Motor Relay d) Control Timer (Printed Circuit Board) e) Gear Motor Protect Relay [4] Water has been a) Gear Motor Fuse supplied. Fan Motor (Bussman GMD starts, but 1.5A) Compressor and b) Thermal Protector Gear Motor will not (Gear Motor) start.
  • Page 32 PROBLEM [7] Gear Motor and a) Refrigerant Line Compressor start but no ice is produced. b) Shut-off Valves on POSSIBLE CAUSE 1. Gas leaks. 2. Refrigerant line clogged. 1. Closed. Condensing Unit REMEDY 1. Check for leaks with a leak detector. Reweld leak, replace drier and charge with refrigerant.

  • Page 33: Low Ice Production

    2. Low Ice Production PROBLEM [1] Low ice production a) Refrigerant Line b) High-side Pressure c) Expansion Valve POSSIBLE CAUSE 1. Gas leaks. 2. Refrigerant line clogged. 3. Overcharged. 1. Dirty Air Filter or Too High Condenser. 2. Ambient temperature too warm.

  • Page 34: Other

    3. Other PROBLEM [1] Abnormal noise a) Fan Motor b) Compressor c) Refrigerant Lines d) Gear Motor (Ice e) Evaporator [2] Overflow from a) Water Supply Reservoir (Water does not stop.) b) Control Water Valve c) Float Switch [3] Gear Motor Fuse a) Power Supply blows or circuit breaker trips...

  • Page 35: Removal And Replacement Of Components

    5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-side line. Remember to loosen the connection, and purge the air from the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.

  • Page 36: Brazing

    6) A liquid charge is recommended for charging an R-404A system. Invert the service cylinder. Open the high-side, service manifold valve. 7) Allow the system to charge with liquid until the pressures balance. 8) If necessary, add any remaining charge to the system through the low-side. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side access port with the unit running.

  • Page 37: Removal And Replacement Of Compressor

    3. Removal and Replacement of Compressor 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) Remove the panels. 2) Remove the terminal cover on the compressor, and disconnect the compressor wiring.

  • Page 38: Removal And Replacement Of Drier

    13) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles. 14) Evacuate the system, and charge it with refrigerant. See the nameplate for the required refrigerant charge and type. 15) Connect the terminals to the compressor, and replace the terminal cover in its correct position.

  • Page 39: Removal And Replacement Of Expansion Valve

    5. Removal and Replacement of Expansion Valve 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 repairs or replacement have been made.

  • Page 40: Removal And Replacement Of Evaporator Assembly

    6. Removal and Replacement of Evaporator Assembly 1) Drain the water from the evaporator by switching the flush switch to “FLUSH” on the control box. 2) Unplug the icemaker. 3) Remove the panels. 4) Remove the three thumbscrews and take off the spout from the evaporator. Cutter 5) Loosen the cutter by a wrench and remove it.
  • Page 41 11) Remove the bulb of the expansion valve. 12) Disconnect the brazing-connections of the expansion valve and the copper tube- low side from the evaporator, using brazing equipment. 13) Remove the two truss head machine screws and the bracket securing the evaporator.

  • Page 42: Removal And Replacement Of Fan Motor

    23) When replacing the evaporator: (a) Braze the new evaporator with nitrogen gas flowing at the pressure of 3-4 PSIG. (b) Replace the drier. (c) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles. (d) Evacuate the system. Charge it with refrigerant. See the nameplate for required refrigerant charge and type.

  • Page 43: Removal And Replacement Of Flush Water Valve

    6) Remove the water supply hose from the control water valve. 7) Install the new control water valve. 8) Assemble the removed parts in the reverse order of the above procedure. 9) Open the water supply line shut-off valve. 10) Check for water leaks. 11) Replace the panels in their correct position.

  • Page 44: Cleaning And Maintenance

    14) Move the flush switch to the “ICE” position. 15) Check for water leaks. 16) Move the flush switch to the “FLUSH” position, and make sure water is flushing. 17) Move the flush switch to the “ICE” position. 18) Replace the panels in their correct position. VI.

  • Page 45: Cleaning And Sanitizing Instructions

    [a] Cleaning Solution Dilute 4.8 fl. oz. (142 ml) of recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY” (Economics Laboratory, Inc.) with 0.8 gallons (3 l) of warm water. This is a minimum amount. Make more solution if necessary.

  • Page 46: [B] Cleaning Procedure

    [b] Cleaning Procedure The cleaning process will remove lime deposits from the water system. 1) Remove the front panel and top panel, then turn off the power supply. 2) Close the water supply line shut-off valve. 3) Remove all ice from the storage bin. 4) Move the flush switch to the “FLUSH”...

  • Page 47: [C] Sanitizing Solution

    [c] Sanitizing Solution Dilute 2.5 fl. oz. (74 ml or 5 tbs) of IMS-II Sanitizer or a 5.25% sodium hypochlorite solution (chlorine bleach) with 5 gallons (19 l) of warm water. For safety and maximum effectiveness, use the solution immediately after dilution.

  • Page 48: [E] Sanitizing Procedure - Final

    14) Replace all parts in their correct positions. When installing the baffles, make sure that the bent surface (the one without the studs) faces the actuator so that the bent surface can guide the ice to the center of the actuator. 15) Move the flush switch to the “ICE”...
  • Page 49 16) When the gear motor starts, remove the front panel and turn off the power supply. 17) Drain out all water from the water line. See 2) and 3). 18) Move the flush switch to the “ICE” position and run the icemaker. 19) Turn off the power supply after 30 minutes.

  • Page 50: Maintenance Instructions

    More frequent inspection and maintenance are recommended. Consult with your local distributor about inspection and maintenance service. To obtain the name and phone number of your local distributor, call Hoshizaki Technical Support at 1-800-233-1940 in the USA. 1) Stainless Steel Exterior To prevent corrosion, wipe the exterior occasionally with a clean and soft cloth.
  • Page 51 3) Air Filter A plastic mesh air filter removes dirt or dust from the air, and keeps the condenser from getting clogged. As the filter gets clogged, the icemaker’s performance will be reduced. Check the filter at least twice a month. When clogged, use warm water and a neutral cleaner to wash the filter.

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F-450mah-c

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