Hoshizaki KM-901MAH Service Manual
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Hoshizaki KM-901MAH Service Manual

Modular crescent cuber
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Hoshizaki
Hoshizaki America, Inc.
"A Superior Degree
of Reliability"
www.hoshizaki.com
Modular Crescent Cuber
Models
KM-901MAH
KM-901MWH
KM-901MRH/3
SERVICE MANUAL
1
™
Number: 73156
Issued: 4-18-2008
Revised: 6-23-2009

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Summary of Contents for Hoshizaki KM-901MAH

  • Page 1 Hoshizaki America, Inc. “A Superior Degree of Reliability” www.hoshizaki.com Modular Crescent Cuber Models KM-901MAH KM-901MWH KM-901MRH/3 SERVICE MANUAL ™ Number: 73156 Issued: 4-18-2008 Revised: 6-23-2009...
  • 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

    A. Icemaker ... 7 1a. KM-901MAH (air-cooled) Auxiliary Code T-0, U-0 ... 7 1b. KM-901MAH (air-cooled) Auxiliary Code U-1 and Later ... 8 2a. KM-901MWH (water-cooled) Auxiliary Code T-0, U-0 ... 9 2b. KM-901MWH (water-cooled) Auxiliary Code U-1 and Later ... 10 3a.
  • Page 4 3. KM-901MRH/3 (remote air-cooled) ... 39 B. Wiring Diagrams ... 40 1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 ... 40 a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) ... 40 b) KM-901MRH (remote air-cooled) ... 41 c) KM-901MRH3 (remote air-cooled) ... 42 2.
  • Page 5 V. Removal and Replacement of Components ... 68 A. Service for Refrigerant Lines ... 68 1. Refrigerant Recovery ... 68 2. Brazing ... 69 3. Evacuation and Recharge (R-404A) ... 69 B. Removal and Replacement of Compressor ... 70 C. Removal and Replacement of Expansion Valve ... 71 D.

  • Page 6: Important Safety Information

    Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, or damage to the unit. WARNING Indicates a hazardous situation which could result in death or serious injury. CAUTION Indicates a situation which could result in damage to the unit.

  • Page 7: Specifications

    I. Specifications A. Icemaker 1a. KM-901MAH (air-cooled) Auxiliary Code T-0, U-0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 8: 1B. Km-901Mah (Air-Cooled) Auxiliary Code U-1 And Later

    1b. KM-901MAH (air-cooled) Auxiliary Code U-1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 9: 2A. Km-901Mwh (Water-Cooled) Auxiliary Code T-0, U-0

    2a. KM-901MWH (water-cooled) Auxiliary Code T-0, U-0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 10: 2B. Km-901Mwh (Water-Cooled) Auxiliary Code U-1 And Later

    2b. KM-901MWH (water-cooled) Auxiliary Code U-1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 11: 3A. Km-901Mrh (Remote Air-Cooled) Auxiliary Code T-0, U-0

    3a. KM-901MRH (remote air-cooled) Auxiliary Code T-0, U-0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 12: 3B. Km-901Mrh (Remote Air-Cooled) Auxiliary Code U-1 And Later

    3b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 13: 4A. Km-901Mrh3 (Remote Air-Cooled) Auxiliary Code T-0, U-0

    4a. KM-901MRH3 (remote air-cooled) Auxiliary Code T-0, U-0 AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 14: 4B. Km-901Mrh (Remote Air-Cooled) Auxiliary Code U-1 And Later

    4b. KM-901MRH (remote air-cooled) Auxiliary Code U-1 and Later AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC &...

  • Page 15: Condenser Unit

    B. Condenser Unit 1. URC-9F...

  • Page 16: Specifications

    Specifications MODEL: URC-9F AC SUPPLY VOLTAGE FAN MOTOR EXTERIOR DIMENSIONS (WxDxH) DIMENSIONS INCLUDING LEGS (WxDxH) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - REFRIGERANT CONDENSER FAN MOTOR PROTECTION REFRIGERANT CONTROL REFRIGERANT CHARGE DESIGN PRESSURE OPERATING CONDITIONS ACCESSORIES -SUPPLIED Note: We reserve the right to make changes in specifications and design without prior notice.

  • Page 17: General Information

    II. General Information A. Construction 1. KM-901MAH (air-cooled) Spray Tubes Cleaning Valve Expansion Valves Control Switch Float Switch Water Pump Thermostatic Bin Control Bracket & Bulb Holder Auxiliary Code T-0, U-0 Water Supply Inlet Thermostatic Bin Control Auxiliary Code T-0, U-0...

  • Page 18: Km-901Mwh (Water-Cooled)

    2. KM-901MWH (water-cooled) Spray Tubes Cleaning Valve Expansion Valves Control Switch Float Switch Water Pump Compressor Thermostatic Bin Control Bracket & Bulb Holder Auxiliary Code T-0, U-0 Water Supply Inlet Hot Gas Valve Thermostatic Bin Control Auxiliary Code T-0, U-0 Mechanical Bin Control and Bracket Auxiliary Code U-1 and later Junction...

  • Page 19: Km-901Mrh/3 (Remote Air-Cooled)

    3. KM-901MRH/3 (remote air-cooled) Spray Tubes Cleaning Valve Expansion Valves Control Switch Float Switch Water Pump Compressor Thermostatic Bin Control Bracket & Bulb Holder Auxiliary Code T-0, U-0 Water Supply Inlet Hot Gas Valve Liquid Line Valve Thermostatic Bin Control Auxiliary Code T-0, U-0 Mechanical Bin Control and Bracket Auxiliary Code U-1 and later...

  • Page 20: Sequence Of Operation

    B. Sequence of Operation 1. Sequence Cycles and Shutdown a) "E" Control Board: Auxiliary Code T-0, U-0 The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED comes on. There is a 5-second delay before startup. Note that the order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.

  • Page 21: B) "G" Control Board: Auxiliary Code U-1 And Later

    (5) Harvest Cycle Same as the initial harvest cycle. See "II.B.1.a)(2) Initial Harvest Cycle." Note: Unit continues to cycle until TBC is satisfied or power is turned off. The unit always restarts at the 1-minute fill cycle. (6) Shutdown When ice contacts the thermostatic bulb (TBC switch open), TBC shuts down the unit within 10 seconds.

  • Page 22: Pump-Out Cycle

    (3) Freeze Cycle LED 1 is on. Comp and FMR remain energized, PM, FM, and LLV energize. HGV and WV de-energize. For the first 5 minutes, CB will not accept a signal from F/S. This minimum 5-minute freeze time is short cycle protection for Comp. At the end of 5 minutes, F/S assumes control.
  • Page 23 (6) Shutdown When MBC is activated (MBC open), the yellow "BC OPEN" LED comes on. The unit then shuts down as outlined in the table below. Cycle at Shutdown Mechanical Bin Control Activation Fill Cycle 15 seconds after activation. Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated at the end of the harvest cycle.

  • Page 24: Sequence Flow Chart

    2. Sequence Flow Chart a) "E" Control Board: Auxiliary Code T-0, U-0...

  • Page 25: B) "G" Control Board: Auxiliary Code U-1 And Later

    b) "G" Control Board: Auxiliary Code U-1 and Later...

  • Page 26: Control Board

    C. Control Board • A Hoshizaki exclusive solid-state control board is employed in KM-901MAH, KM-901MWH, and KM-901MRH/3 Modular Crescent Cubers. • All models are pretested and factory set. 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the control board.

  • Page 27: Control Board Layout

    1. Control Board Layout a) "E" Control Board: Auxiliary Code T-0, U-0 S4 Dip Switch "ALARM RESET" Button Freeze Timer LED Harvest Timer LED Alarm Buzzer Power LED (lights when power is supplied to the control board) Relay LEDs (4) (indicate which relays are energized as listed below)

  • Page 28: "G" Control Board

    b) "G" Control Board: Auxiliary Code U-1 and Later Bin Control Switch "ALARM RESET" Button Closed LED (green) (on continuously in thermostatic bin control application) Bin Control Switch Open LED (yellow) (mechanical bin control application only) Part Number Alarm Buzzer Power LED (red) (lights when power is supplied...

  • Page 29: Features

    2. Features a) Maximum Water Supply Period - 6 minutes "E" control board: The inlet water valve is open during harvest for 6 minutes or the length of harvest, whichever is shorter. "G" control board: The inlet water valve is open during harvest for 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter.

  • Page 30: F) Led Lights And Audible Alarm Safeties

    f) LED Lights and Audible Alarm Safeties (1) "E" Control Board: Auxiliary Code T-0, U-0 At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when power is turned off. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs.
  • Page 31 (2) "G" Control Board: Auxiliary Code U-1 and Later At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs.

  • Page 32: Controls And Adjustments

    Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 24-hour production.

  • Page 33: C) Pump-Out Timer (S4 Dip Switch 3 & 4)

    c) Pump-Out Timer (S4 dip switch 3 & 4) When a pump-out is called for, the pump motor de-energizes after the preceding freeze cycle. The pump motor energizes 2 seconds later in the reverse direction, taking water from the bottom of the tank and forcing pressure against the check valve seat allowing water to go through the check valve and down the drain.

  • Page 34: E) Bin Control Selector/Harvest Pump Timer (S4 Dip Switch 7)

    e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7) Depending on the control board, S4 dip switch 7 is either a bin control selector or harvest pump timer. Do not adjust. This dip switch must be left in the factory default position or this unit will not operate correctly.

  • Page 35: G) Freeze Timer (S4 Dip Switch 9 & 10)

    In this case, see "IV.F.3. Low Ice Production" for possible solutions. The freeze timer is factory set, and generally no adjustment is required. Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations.

  • Page 36: Bin Control

    D. Bin Control 1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 When the ambient temperature is below 45°F (7°C), the thermostatic bin control switch opens and shuts down the icemaker even if the ice storage bin is empty. When the thermostat is set in the prohibited range, the icemaker operates continuously even if the ice storage bin is filled with ice.

  • Page 37: Technical Information

    III. Technical Information A. Water Circuit and Refrigeration Circuit 1. KM-901MAH (air-cooled) Inlet Water Valve Water Supply Cleaning Valve Float Switch Drain Refrigeration Circuit Water Circuit Spray Tubes Condenser Evaporator Thermistor Suction Line Access Valve Water Pump Water Tank Pump-Out...

  • Page 38: Km-901Mwh (Water-Cooled)

    2. KM-901MWH (water-cooled) Inlet Water Valve Water Supply Cleaning Valve Float Switch Drain Refrigeration Circuit Water Circuit Spray Tubes Evaporator Thermistor Access Valve Water Pump Water Tank Pump-Out Freeze Check Valve Water Regulating Valve Condenser High Pressure Switch Strainer Drier Suction Line Access Valve...

  • Page 39: Km-901Mrh/3 (Remote Air-Cooled)

    3. KM-901MRH/3 (remote air-cooled) Inlet Water Valve Water Supply Cleaning Valve Float Switch Drain Refrigeration Circuit Water Circuit Condenser Headmaster (C.P.R.) Spray Tubes Receiver Tank Evaporator Thermistor Access Valve Water Pump Water Tank Pump-Out Freeze Check Valve Access Valve Drier High Pressure Switch Liquid Line...

  • Page 40: Wiring Diagrams

    B. Wiring Diagrams 1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) Thermostatic Bin Control: Auxiliary Code T-0, U-0...

  • Page 41: B) Km-901Mrh (Remote Air-Cooled)

    b) KM-901MRH (remote air-cooled) Thermostatic Bin Control: Auxiliary Code T-0, U-0...

  • Page 42: C) Km-901Mrh3 (Remote Air-Cooled)

    c) KM-901MRH3 (remote air-cooled) Thermostatic Bin Control: Auxiliary Code T-0, U-0...

  • Page 43: Mechanical Bin Control: Auxiliary Code U-1 And Later

    2. Mechanical Bin Control: Auxiliary Code U-1 and Later a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) Mechanical Bin Control: Auxiliary Code U-1 and Later...

  • Page 44: B) Km-901Mrh (Remote Air-Cooled)

    b) KM-901MRH (remote air-cooled) Mechanical Bin Control: Auxiliary Code U-1 and Later...

  • Page 45: C) Km-901Mrh3 (Remote Air-Cooled)

    c) KM-901MRH3 (remote air-cooled) Mechanical Bin Control: Auxiliary Code U-1 and Later...

  • Page 46: Performance Data

    C. Performance Data 1. KM-901MAH (air-cooled) APPROXIMATE ICE AMBIENT TEMP. PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm...

  • Page 47: Km-901Mwh (Water-Cooled)

    2. KM-901MWH (water-cooled) APPROXIMATE ICE AMBIENT TEMP. PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm SUCTION PRESSURE PSIG kg/cm TOTAL HEAT OF REJECTION FROM CONDENSER TOTAL HEAT OF REJECTION FROM COMPRESSOR...

  • Page 48: Km-901Mrh (Remote Air-Cooled)

    3. KM-901MRH (remote air-cooled) APPROXIMATE ICE AMBIENT TEMP. PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm SUCTION PRESSURE PSIG kg/cm TOTAL HEAT OF REJECTION FROM CONDENSER...

  • Page 49: Km-901Mrh3 (Remote Air-Cooled)

    4. KM-901MRH3 (remote air-cooled) APPROXIMATE ICE AMBIENT TEMP. PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm SUCTION PRESSURE PSIG kg/cm TOTAL HEAT OF REJECTION FROM CONDENSER...

  • Page 50: Service Diagnosis

    IV. Service Diagnosis 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices.
  • Page 51 3) 1-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 minute, CB checks for a closed F/S. If F/S is closed, the harvest cycle begins. If closed, continue to step 4. If open, WV remains energized through additional 1-minute fill cycles until water fills the tank and closes F/S (low water safety).
  • Page 52 5) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM, LLV, and FM energize. WV and HGV de-energize. The unit is held in freeze by a 5-minute short cycle protection timer (CB will not accept a signal from F/S). After the 5-minute short cycle protection timer expires, CB turns freeze termination over to F/S.

  • Page 53: Control Board Check

    7) Normal Harvest Cycle – same as the initial harvest cycle – See "IV.A.4) Initial Harvest Cycle." 8) Shutdown a) Thermostatic Bin Control: Auxiliary Code T-0, U-0 When the unit is running hold ice in contact with the thermostatic bulb, TBC switch opens within 10 seconds, shutting down the unit.

  • Page 54: Bin Control Check

    3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press the "OUTPUT TEST" button. For the correct lighting sequence, see the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2.

  • Page 55: Mechanical Bin Control Check And Cleaning: Auxiliary Code U-1 And Later

    2. Mechanical Bin Control Check and Cleaning: Auxiliary Code U-1 and Later a) Mechanical Bin Control Check To check the mechanical bin control switch, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF" position. 3) Remove the control box cover, then clear any ice away from the mechanical bin control.

  • Page 56: B) Mechanical Bin Control Cleaning

    5) Remove the actuator paddle from the switch mount. See Fig. 1. 6) Wipe down the mechanical bin control assembly with a mixture of 1 part of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) and 25 parts of warm water. Rinse the parts thoroughly with clean water.

  • Page 57: Float Switch Check And Cleaning

    D. Float Switch Check and Cleaning 1. Float Switch Check To check the float switch, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel and move the control switch to the "OFF" position. 3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank.

  • Page 58: Float Switch Cleaning

    6) Wipe down the float switch housing, shaft, float, and retainer rod with a mixture of 1 part of recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) and 25 parts of warm water. Clean the inside of the rubber boot and hose with cleaning solution.

  • Page 59: Thermistor Check

    E. Thermistor Check To check thermistor resistance, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF" position. 3) Remove the control box cover. 4) Remove the thermistor. See "V.L. Removal and Replacement of Thermistor." 5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes.

  • Page 60: Diagnostic Charts

    F. Diagnostic Charts 1. No Ice Production Problem Possible Cause [1] The icemaker will not a) Power Supply start. b) Transformer (115V primary) (3 phase only) c) Water Supply d) Thermostatic Bin Control e) Fuse (Control Box) f) Control Switch g) High Pressure Control Remedy 1.
  • Page 61 Problem Possible Cause [1] The icemaker will not h) Transformer start. (continued) i) Wiring to Control Board 1. Loose connections or j) Interlock Switch (Cleaning Valve) k) Mechanical Bin Control 1. Movement restricted. l) Thermistor m)Hot Gas Valve n) Inlet Water Valve o) Float Switch p) Control Board [2] Fill cycle will not...
  • Page 62 Problem Possible Cause [3] Compressor will a) Magnetic Contactor not start or stops operating. b) Start Capacitor or Run Capacitor c) Internal Overload Protector Open (check 1 through 3 to the right and d through f below) d) Starter e) Compressor f) Control Board [4] Water continues to a) Water Pressure...

  • Page 63: Evaporator Is Frozen Up

    Problem Possible Cause [7] Fan motor will a) Fan Motor not start, or is not operating (except water-cooled model). b) Control Board [8] All components a) Refrigerant run, but no ice is produced. b) Compressor c) Hot Gas Valve d) Liquid Line Valve (if applicable) e) Inlet Water Valve f) Expansion Valve...
  • Page 64 Problem Possible Cause [1]Freeze cycle time is f) Thermistor too long. (continued) g) Refrigerant h) Expansion Valve i) Control Board [2]All ice formed on a) Evaporator evaporator does not fall into bin in harvest b) Ambient and/or Water cycle. Temperature c) Water Supply Line d) Water System e) Inlet Water Valve...

  • Page 65: Low Ice Production

    Problem Possible Cause [2]All ice formed on l) Refrigerant evaporator does not fall into bin in harvest cycle. (continued) m)Water Regulating Valve (water-cooled model) [3]Other. a) Ice Cube Guide b) Thermostatic Bin Control c) Mechanical Bin Control 1. Movement restricted. 3.

  • Page 66: Abnormal Ice

    Problem Possible Cause [1] Freeze cycle time is n) Control Board long. (continued) [2] Harvest cycle time is a) Water Supply long. b) Thermistor c) Control Board d) Inlet Water Valve e) Evaporator f) Hot Gas Valve g) Expansion Valve h) Water Regulating Valve (water-cooled model) i) Liquid Line Valve (if...
  • Page 67 Problem Possible Cause [2] Cloudy or irregular a) Evaporator cubes. b) Water System c) Spray Guide 5. Other Problem Possible Cause [1] Icemaker will not stop a) Thermostatic Bin when bin is filled with Control ice. b) Mechanical Bin Control 1. Movement restricted. c) Control Board ("G"...

  • Page 68: Removal And Replacement Of Components

    V. Removal and Replacement of Components 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Move the control switch to the "OFF" position and turn off the power supply before servicing.

  • Page 69: Brazing

    2. Brazing 1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous. 3.

  • Page 70: Removal And Replacement Of Compressor

    For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

  • Page 71: Removal And Replacement Of Expansion Valve

    8) Attach the rubber grommets of the prior compressor to the new compressor. 9) Place the compressor in position and secure it using the bolts and washers. 10) Remove the drier, then place the new drier in position. 11) Remove the plugs from the suction, discharge, and process pipes. 12) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.

  • Page 72: Removal And Replacement Of Hot Gas Valve Or Liquid Line Valve

    8) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

  • Page 73: Removal And Replacement Of Evaporator

    10) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker. 11) Replace the solenoid in its correct position. 12) Replace the panels in their correct positions.

  • Page 74: Removal And Replacement Of Air-Cooled Condenser

    F. Removal and Replacement of Air-Cooled Condenser 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.

  • Page 75: Removal And Replacement Of Water-Cooled Condenser

    G. Removal and Replacement of Water-Cooled Condenser 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.

  • Page 76: Removal And Replacement Of Remote Air-Cooled Condenser

    H. Removal and Replacement of Remote Air-Cooled Condenser 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.

  • Page 77: Removal And Replacement Of Water Regulating Valve (Water-Cooled Model)

    I. Removal and Replacement of Water Regulating Valve (water-cooled model) 1. Always install a new drier every time the sealed refrigeration system is opened. 2. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.

  • Page 78: K. Removal And Replacement Of Headmaster (Condensing Pressure Regulator - C.p.r Remote Air-Cooled Model)

    18) Check for water leaks. 19) Replace the panels in their correct positions. 20) Turn on the power supply. J. Adjustment of Water Regulating Valve (water-cooled model) The water regulating valve (also called "water regulator") is factory set, and generally no adjustment is required.

  • Page 79: Removal And Replacement Of Thermistor

    8) Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG).

  • Page 80: Removal And Replacement Of Fan Motor (Air-Cooled And Remote Air-Cooled Models)

    10) Secure the insulation using plastic cable ties. 11) Connect the white thermistor connector through the bushing of the control box to the control board WHITE K3 connector. Note: Do not cut the leads of the thermistor. 12) Replace the control box cover and the panels in their correct positions. 13) Turn on the power supply.

  • Page 81: Removal And Replacement Of Pump Motor

    12) Replace the front panel in its correct position. 13) Turn on the power supply. O. Removal and Replacement of Pump Motor 1) Turn off the power supply. 2) Remove the front panel. 3) Remove the base cover, then disconnect one end of the pump tubing to drain the water tank.

  • Page 82: Removal And Replacement Of Control Board

    P. Removal and Replacement of Control Board When replacing a control board follow the precautions below. 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the control board.

  • Page 83: Cleaning And Maintenance

    A. Cleaning and Sanitizing Instructions Hoshizaki recommends cleaning and sanitizing this unit at least once a year. More frequent cleaning and sanitizing, however, may be required in some existing water conditions.

  • Page 84: Cleaning Procedure

    1. Cleaning Procedure 1) Dilute 16 fl. oz. (473 ml) of Hoshizaki "Scale Away" with 3 gal. (11 l) of warm water. 2) Remove all ice from the evaporator and the storage bin. Note: To remove cubes on the evaporator, turn off the power supply and turn it back on after 3 minutes.

  • Page 85: Sanitizing Procedure - Following Cleaning Procedure

    19) Turn off the power supply after 3 minutes. 20) Remove the front panel and fully open the cleaning valve. 21) Move the control switch to the "WASH" position. 22) Replace the front panel in its correct position. 23) Turn on the power supply to rinse off the cleaning solution. 24) Turn off the power supply after 5 minutes.

  • Page 86: Maintenance

    B. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. 1. Only qualified service technicians should attempt to service or maintain this icemaker. 2. Disconnect power before performing service or maintenance. 1.
  • Page 87 5) Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve. 6) Move the control switch to the "ICE" position. 7) Replace the front panel in its correct position, then turn on the power supply. 8) Blow the icemaker water supply line out using the compressed air or carbon dioxide supply.

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