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Hoshizaki IM-51BAE - page 1
1 IM SERVICE TRAINING Featuring the IM-51BAE 80041 9/9/99 ...
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Hoshizaki IM-51BAE - page 2
2 All IM models have similar sequence of operation. This manual is designed as a generic IM Training manual. The Hoshizaki IM series ice machine uses a horizontal evaporator design. This compact unit is designed for counter-top, under-counter, or free- standing installations. A standard 120 volt power cord provides the electrical connection. The un ...
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Hoshizaki IM-51BAE - page 3
3 This horizontal evaporator and water distribution system is unique to the IM series. The ABS water plate sprays water up into the evaporator cells to form the square IM cube. The moveable water pan assembly includes the water plate, reservoir pan, and pump motor assembly. Tension springs connect two cam arms to the water plate assembly. An actuat ...
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Hoshizaki IM-51BAE - page 4
4 The front cam arm has a switch lever that operates the actuator toggle switch located above the pan assembly. The actuator toggle switch controls the direction of rotation for the actuator motor and energizes the pump motor during the freeze cycle. • When the switch is in the right position, the actuator motor rotates counter clock wise to lowe ...
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Hoshizaki IM-51BAE - page 5
5 The louver has a flip down cover to access the control switch. The switch has 3 positions. ICE, OFF, & WASH. The louver covers the compressor compartment. Remove the louver screws and lift the louver forward to access the condenser coil fan assembly and compressor. For easy access during preventative maintenance or service, the inlet water va ...
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Hoshizaki IM-51BAE - page 6
6 The control box is accessed from the rear of the unit. Remove the screws holding the pipe cover and the control box cover to reach the control board and other components. A solid state board controls the IM operation. Several adjustments are included on the board. These adjustments are factory set for proper operation. Later, we will cover the ad ...
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Hoshizaki IM-51BAE - page 7
7 The actuator motor turns counter clock wise to rotate the cam arms and lower the water pan away from the evaporator. When the water plate is completely down the switch lever moves the actuator toggle switch to the left. The board energizes the inlet water valve and condenser fan motor and de-energizes the hot gas valve. Switching the actuator tog ...
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Hoshizaki IM-51BAE - page 8
8 The freeze cycle is controlled by a thermistor, which is mounted at the evaporator outlet. The pump is spraying water up into the evaporator cells to form the square IM cubes. The evaporator temperature lowers as the ice cubes form. A thermistor temperature of – 9.4 ° F signals the control board to begin harvest and energize the hot gas valve ...
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Hoshizaki IM-51BAE - page 9
9 The unit will continue through the freeze and harvest cycle until the bin control shuts down the refrigeration system. When pushed over, the bin control has a 10-second delay before shut down occurs. An 85-second delay occurs at startup when the bin control is released. Now let’s take a look at the control board adjustments. Remember that the a ...
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Hoshizaki IM-51BAE - page 10
10 The maximum freeze timer is VR3. This timer will automatically switch the unit to the harvest cycle if the freeze cycle last longer than the setting time. The factory setting is 45 minutes. The defrost control VR2 will adjust the time period between ice-drop and actuator motor restart during harvest. The factory setting is 4. This setting repres ...
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Hoshizaki IM-51BAE - page 11
11 A red Service Indicator LED is also included on the control board. This LED will either light continually or flash to indicate a service fault. A fault diagnosis chart in the service manual will help the technician determine the actual problem. See chart next page. Preventative maintenance for the IM is simple. Follow these steps to allow the un ...
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Hoshizaki IM-51BAE - page 12
12 FAULT DIAGNOSIS Check the status of the Service lamp on the Controller Board (LED-5) by removing the Control Box Cover. Lamp ON – Water Plate closed This tends to indicate the Back-up Timer has stopped machine operation during the freeze cycle. High ambient and water temperature are an obvious cause. But check out each component that could res ...
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Hoshizaki IM-51BAE - page 13
13 PATTERN INTERLOCK INDICATOR WATER TANK POSITION POSSIBLE CAUSE REMEDY 1 2 0V Leak 3 Hot Gas leak 4 5 Gas 2 6 1 115v 2 Gas 3 3 1 Lever 2 3 4 Actuator motor Pin 4 5 Freeze Cycle Clogged Air Filter and/or Condenser Clean or Replace Replace Replace Check for leak Replace Comp. Start Capacitor Replace Water leak from Water Solenoid Valve Gas leak fro ...
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Hoshizaki IM-51BAE - page 14
14 WIRING DIAGRAM IM-51BAE ...
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Hoshizaki IM-51BAE - page 15
15 IM SERIES REVIEW QUIZ C hoose the best answer for each question below. 1. The IM control board is located in the rear or the unit. True False 2. The IM unit uses a thermostatic bin control. True False 3. The bin control switch must OPEN or Close to shut the unit down. 4. The IM series uses R-404A or R-134A refrigerant. 5. To raise the water pan ...
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Hoshizaki IM-51BAE - page 16
16 NOTES: Quiz answers: 1.True , 2. False , 3. Close , 4. R-134A , 5. Left , 6. CW , 7. – 9.4ºF , 8. 45 min. , 9. Harvest initiation , 10. 24 volt ...
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