Hoshizaki IM-100A Service Manual
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Hoshizaki IM-100A Service Manual

Hoshizaki IM-100A Service Manual

Controller board
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CONTROLLER BOARD
SERVICE MANUAL
This service manual provides information on the controller board used for
Hoshizaki IM-220AA/AWA, IM-100A, and IM-130A cubers.
Please also refer to the applicable service manual for each model.
If any information contained herein is inconsistent with the instruction or
installation manual, follow the latter manual.
IM-100A
IM-130A
IM-220AA
IM-220AWA
M028-861 (070221)

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  • Page 1 SERVICE MANUAL This service manual provides information on the controller board used for Hoshizaki IM-220AA/AWA, IM-100A, and IM-130A cubers. Please also refer to the applicable service manual for each model. If any information contained herein is inconsistent with the instruction or installation manual, follow the latter manual.

  • Page 2: Table Of Contents

    CONTENTS PAGE 1. CONFIGURATION ---------------------------------------------------------------------- 1 [a] INPUT/OUTPUT LAYOUT -------------------------------------------------------- 1 [b] INPUT/OUTPUT CIRCUIT -------------------------------------------------------- 2 [c] BOARD CONFIGURATION ------------------------------------------------------ 3 [d] SWITCH OPERATION ------------------------------------------------------------- 4 [e] VERSION COMPARISON -------------------------------------------------------- 6 2. OPERATION ----------------------------------------------------------------------------- 7 [a] SOFT START ------------------------------------------------------------------------ 7 [b] WATER PAN OPENS -------------------------------------------------------------- 7 [c] DEFROST CYCLE ------------------------------------------------------------------ 8 [d] WATER PAN CLOSES ------------------------------------------------------------ 8...
  • Page 3 7. REMOVAL AND REPLACEMENT ------------------------------------------------ 40 8. TIMING CHART ----------------------------------------------------------------------- 42...

  • Page 4: Configuration

    1. CONFIGURATION [a] INPUT/OUTPUT LAYOUT Float Switch Input XA Connector (4P) * P01873-03 (Ver 1.0A or later) CN15...

  • Page 5: [B] Input/Output Circuit

    [b] INPUT/OUTPUT CIRCUIT FLOAT SWITCH * P01873-03 (Ver 1.0A or later)

  • Page 6: [C] Board Configuration

    [c] BOARD CONFIGURATION [Main Board] [Sub Board] 7-segment display board The direction to install the sub board depends on models and is easily changeable by connectors. Horizontal installation into control box Vertical installation into control box...

  • Page 7: [D] Switch Operation

    [d] SWITCH OPERATION 1) The following is the switch operation flow in different modes. When pressed and released, the switch detects the operation by its pressing duration. P01873-01 (Ver. 1.8D or earlier) P01873-02 (Ver. 1.2F or earlier) Water pan opens (initial cycle) Freeze setting mode Freeze setting mode Normal mode...
  • Page 8 2) To clear the current model code information and enter the model setting mode, press the up and down switches together for 15 seconds while the model code is indicated in the display mode (see “3. [c] DISPLAY MODE”). P01873-01 (Ver.

  • Page 9: [E] Version Comparison

    [e] VERSION COMPARISON Operator P01873-01 (Ver. 1.9A or later), P01873-01 (Ver. 1.8D or earlier), P01873-02 (Ver. 1.4A or later), P01873-02 (Ver. 1.2F or earlier) P01873-03 (Ver. 1.0A or later) End-user ● Control mode: Normal ● Control mode: Normal ● No. 2: Target integrated freeze ●...

  • Page 10: Operation

    Setting number P01873-01 (Ver. 1.9A or later), P01873-01 (Ver. 1.8D or earlier), P01873-02 (Ver. 1.4A or later), P01873-02 (Ver. 1.2F or earlier) P01873-03 (Ver. 1.0A or later) No. 71 Setting range: 0 to Setting range: 0 to Hot gas valve ON * every 1 sec * every 1 sec time to prevent ice...

  • Page 11: [C] Defrost Cycle

    [c] DEFROST CYCLE 1) After the water pan opens, the hot gas valve opens until the defrost completion temperature is reached. 2) If the defrost completion temperature is not reached even when the defrost backup timer counts up (30 minutes after water pan starts to open), the display shows “E2”...
  • Page 12 Note: Full drain flush - After a freeze cycle ends, the unit drains all the remaining water in the tank and refills the tank in the next freeze cycle. Partial drain flush (default setting) - After a freeze cycle ends, the unit leaves the remaining water in the tank and adds some water to fill the tank in the next freeze cycle.

  • Page 13: [F] Freeze Completion Control

    [f] FREEZE COMPLETION CONTROL 1) The target integrated values (cube control thermistor temperature and freeze cycle time) are set for freeze completion. * The target integrated freeze completion temperature and time are adjustable in the maintenance mode (see “3. [b] MAINTENANCE MODE”). 2) After the cube control thermistor senses a temperature below 0°C, the cube control thermistor temperature and freeze cycle time are integrated every second.
  • Page 14 1) Spring/fall 2) Summer Dimple size 5mm Smaller dimple size -18°C -18°C Freeze cycle time (min) Freeze cycle time (min) 3) Winter Larger dimple size -18°C Freeze cycle time (min) Comparison of the evaporator temperature curves finds that the red-colored area varies in different seasons.

  • Page 15: [G] Water Supply Control

    This area corresponds to the energy on ice. Making these different areas into one can equalize the dimple size. To calculate the energy required for ice production, the actual ice production area under 0°C in the evaporator temperature curve is approximated into a triangle. This area can be calculated by Time x temperature ÷...

  • Page 16: [H] Ambient Temperature Correction

    partial drain flush and full drain flush. * The icemaking water supply time and additional water supply time are adjustable in the maintenance mode (see “3. [b] MAINTENANCE MODE”). 2) After the water pan starts to open, the water valve opens in 20 seconds to supply defrosting water (water pan cleaning water) for a specific time.

  • Page 17: [J] Bin Control Cycle

    [j] BIN CONTROL CYCLE 1) When the bin control switch stays on for more than 10 seconds, the bin control cycle starts and the icemaker stops. After the bin control switch stays off for more than 80 seconds, the bin control cycle ends and the icemaker restarts. (The hot gas valve opens 30 seconds before the icemaker restarts.) 2) After the bin control cycle ends (or when the power supply is turned on), the water pan starts to open (if the icemaker stopped while the water pan was...

  • Page 18: [L] 7-Segment Led

    [l] 7-SEGMENT LED 1) When the power supply is turned on, the display shows “on” and the automatic icemaking process starts. 2) When the up or down switch is pressed, the display shows the current setting. When the switch is pressed again, the setting becomes adjustable. When the switches are not pressed for 30 seconds, the adjusted setting is determined with “on”...

  • Page 19: [B] Self-Cleaning Mode (For M028-C106 And M028-C207)

    operates and the display shows “E1”. To reset, press the down switch for 3 seconds. Note: 1. The freeze backup timer and defrost backup timer are available in the water circuit flush mode. As the compressor is off in the flush mode, these timers operates to stop the icemaker in case the freeze or defrost cycle does not complete.

  • Page 20: [C] Maintenance Mode

    display shows “Pr” in the self-cleaning mode. When the reset switch is pressed, the unit starts operation from the preset process (step 1 in the timing chart). The unit shuts down if the water pan opening error (E3) or water pan closing error (E4) occurs while the display shows some other code than “Pr”.
  • Page 21 Maintenance Mode List Item Range Step 1 Defrost completion temp 2 to 20°C 2 Integrated constant 1 (temp) -5 to -40°C 3 Integrated constant 2 (time) 5 to 90 min 4 Ambient temp correction operating 10 to 50°C Basic temp for integrated value 5 Ambient temp correction rate for 10 to 100% (00 = 100) integrated value...
  • Page 22 Ice bridge 73 Hot gas valve off time 0 to 30 sec Low temp in 74 Operating temp 0 to 40°C defrost cycle High 80 Sensed temp 55 to 70°C pressure For the controller board of P01873-03 (Ver. 1.0A or later): (*1) To prevent possible failure, do not change Nos.
  • Page 23 Maintenance Mode Descriptions Item Description 1 Defrost completion Temperature to complete defrost cycle (detected by temp cube control thermistor). 2 Integrated constant 1 Target integrated value inside controller board is (temp) determined by constants 1 and 2. Temperature in freeze cycle is integrated, and freeze cycle continues until target integrated value is reached.
  • Page 24 21 Double stack bin Selection of bin control in case of double stack control application. 22 Refrigeration unit Selection of control to prevent ice in storage bin from operation in bin melting in bin control cycle (by operating refrigeration control cycle unit).
  • Page 25 73 Hot gas valve off Time to keep hot gas valve closed after 20 sec in Ice bridge time defrost cycle. Prevent ice bridge in bin by delaying ice dropping time. Low temp in 74 Operating temp Upper temperature limit at the beginning of defrost defrost cycle cycle.
  • Page 26 Note: To prevent the actuator motor defects, *1. Do not set the defrost completion temperature low. The defrost completion temperature is used to ensure the required standby time until the water pan starts to close after ice is released from the evaporator.
  • Page 27 *2. Do not make dimple diameter small. The dimple in ice is necessary and important to repeat the freeze and defrost cycles normally. The freeze completion temperature and time are factory adjusted to make the dimple diameter more than 5 mm on average. If dimple in ice is small…...
  • Page 28 Maintenance Mode Settings ** Auxiliary code F1 and earlier 220AA 130A 130A 100A (50Hz**) (50Hz) (50Hz) (50Hz) Item Embraco Secop comp. comp. 1 Defrost completion temp 2 Integrated constant 1 (temp) 3 Integrated constant 2 (time) 4 Ambient temp correction operating temp for Basic integrated value 5 Ambient temp correction rate for integrated...
  • Page 29 220AA-21 220AA-23 130A-21 130A-23 Item (50Hz) (50Hz) (50Hz) (50Hz) 1 Defrost completion temp 2 Integrated constant 1 (temp) -8.5 -20.5 3 Integrated constant 2 (time) 4 Ambient temp correction operating Basic temp for integrated value 5 Ambient temp correction rate for integrated value 6 Freeze backup timer 10 Defrosting water supply time, water...
  • Page 30 ** Auxiliary code F2 and later 100A-23 220AA 130A 100A Item (50Hz) (50Hz**) (60Hz) (60Hz) (60Hz) 1 Defrost completion temp 2 Integrated constant 1 (temp) -23.5 -19.5 3 Integrated constant 2 (time) 4 Ambient temp correction operating temp Basic for integrated value 5 Ambient temp correction rate for integrated value 6 Freeze backup timer...
  • Page 31 220AWA 220AWA-21 220AWA Item (50Hz) (50Hz) (60Hz) Defrost completion temp Integrated constant 1 (temp) Integrated constant 2 (time) Ambient temp correction operating temp for Basic integrated value Ambient temp correction rate for integrated value Freeze backup timer 10 Defrosting water supply time, water temp less than 13°C 11 Defrosting water supply time, water temp 13°C or more...
  • Page 32 ** Self-cleaning model 220AA 220AWA Item (50Hz**) (50Hz**) 1 Defrost completion temp 2 Integrated constant 1 (temp) -22.0 -21.5 3 Integrated constant 2 (time) Basic 4 Ambient temp correction operating temp for integrated value 5 Ambient temp correction rate for integrated value 6 Freeze backup timer 10 Defrosting water supply time, water temp less than 13°C...

  • Page 33: [D] Display Mode (Log Clearing)

    [d] DISPLAY MODE (LOG CLEARING) When the up switch is pressed for more than 3 seconds, the display mode starts to allow various items and logs to be checked, displayed or cleared. 1) Press the up switch for more than 3 seconds while the unit is running. The display shows “n1”.

  • Page 34: [E] Model Code Setting Mode

    h4 Error log Display up to 5 errors from latest to oldest for 1 sec ON, 0.5 sec OFF, “- -“ at the end, then back to latest error. In case of less than 5 errors, display oldest error, “- -“, then back to latest one. <...
  • Page 35 Model Code List 1st Digit 2nd Digit Model IM-220AA (50Hz) [auxiliary code F1 & earlier] IM-130A (50Hz) [Embraco comp.] IM-100A (50Hz) IM-220AA-23 (50Hz) IM-130A-23 (50Hz) IM-100A-23 (50Hz) IM-220AA (60Hz), IM-220AA (50Hz) [auxiliary code F2 & later] IM-130A (60Hz) IM-100A (60Hz)

  • Page 36: Segment Display

    4. 7-SEGMENT DISPLAY [a] NORMAL MODE Item Display Power on Defrost cycle Freeze cycle Bin full Display range from -5.0 to -40.0 Freeze temp setting Flash E1: Abnormal freeze cycle E2: Abnormal defrost cycle EE: Other Error code (See “5. ERROR CODES”) Water circuit flush [b] MAINTENANCE MODE...
  • Page 37 4 Ambient temp correction Same as No. 1 operating temp for integrated value 5 Ambient temp correction 100% rate for integrated value (last 2 digits only) 6 Freeze backup timer Same as No. 3 10 Defrosting water supply Same as No. 3 (unit: sec) time, water temp less than 13°C 11 Defrosting water supply...

  • Page 38: [C] Display Mode

    73 Ice bridge, hot gas valve off Same as No. 3 (unit: sec) time 74 Low temp in defrost cycle, Same as No. 1 operating temp 80 High pressure, sensed Same as No. 1 temp [c] DISPLAY MODE Item Display (example) –...

  • Page 39: [D] Self-Cleaning Mode (For M028-C106 And M028-C207)

    Default model code Set model codes from “00” to “9F” (hexadecimal, 160 patterns) [d] SELF-CLEANING MODE (for M028-C106 and M028-C207) Item Display Power on Defrost cycle Freeze cycle Bin full Preset Display switches every 0.2 sec as follows. Ready for cleaning solution supply Display switches every 0.2 sec as follows.
  • Page 40 Error Item Description Operation Reset Freeze backup timer (45 - 90 minutes after water pan starts to close) counts up before Press reset Freeze error Shut down freeze cycle completes, and evaporator switch temperature is 0°C or higher. Defrost backup timer (30 minutes after water Press reset Defrost error pan starts to open) counts up before defrost...

  • Page 41: [B] Service Diagnosis

    [b] SERVICE DIAGNOSIS Error Check Possible Cause Remedy Water valve Closing failure Clean or replace Gas leak Repair Refrigeration circuit Clogged capillary Replace heat exchanger Clogged expansion valve Replace Defective Replace Compressor Check supply voltage or Starting failure replace electrical components Compressor relay Coil circuit open Replace...

  • Page 42: Troubleshooting

    6. TROUBLESHOOTING [a] INSTRUCTIONS FOR SERVICE ENGINEER 1) Check that the icemaker has been earthed properly. If not, the controller board will not work properly. 2) Do not change wiring and connections, or the controller board will not work properly. 3) Do not touch the electronic devices on the controller board or the back of the controller board.

  • Page 43: Removal And Replacement

    7. REMOVAL AND REPLACEMENT The replacement controller board is in common use for all the models. To replace: 1) Unplug the icemaker or disconnect the power source. 2) Remove the front cover and control box cover. 3) Disconnect all the connectors from the controller board. Remove the controller board from the control box.
  • Page 44 the up and down switches for 15 seconds whilst the code is displayed (in display mode). The machine will stop working and the display will reset to “00” (cleared memory). The controller board will then need to be reprogrammed (select and memorise the correct code for the machine) using steps 7) and 8) above.

  • Page 45: Timing Chart

    8. TIMING CHART...
  • Page 53 SELF-CLEANING MODE (for M028-C106 and M028-C207)
  • Page 54 Notes on timing charts (*1, *2) See "3. [b] MAINTENANCE MODE" for models not listed here. 220AA (50Hz) 220AWA (50Hz) 220AA-21 (50Hz) Item 220AWA-21 (50Hz) 220AA-23 (50Hz) 220AWA (60Hz) 220AA (60Hz) Ambient temp in control 21°C - 40°C 40°C or less *1 Water pan defrost control Hot gas valve on/off time T1...
  • Page 55 1) When the power is turned on or the unit resumes operation after a bin control cycle, the water temperature is considered less than 13°C and the water valve opens for T3 seconds to supply defrosting water. If the water temperature is normal, the water pan opens and immediately starts to close again.

This manual is also suitable for:

Im-130aIm-220aaIm-220awa

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