Hoshizaki M029-897 service manual E. Evaporator Thermistor Check

Page 16

E. Evaporator Thermistor Check

To check thermistor resistance, follow the steps below.

1)Turn off the power supply.

2)Remove the front panel. Move the control switch to the "OFF" position.

3)Remove the control box cover.

4)Remove the thermistor from the evaporator.

5)Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.

6)Disconnect the thermistor connector from CB CN13 connector and check the resistance between thermistor leads. Normal range is 4.7 to 6.2 kΩ. If outside the normal range, replace the thermistor. See "IV.B. Component Service Information." If within the normal range, continue to the next step.

7)Replace the thermistor in its correct position. See "IV.B. Component Service Information."

8)Reconnect the thermistor connector to CB CN13 connector.

9)Replace the control box cover in its correct position.

10)Move the control switch to the "ICE" position.

11)Replace the front panel in its correct position.

12)Turn on the power supply.

Legend: CB–control board; Comp–compressor

16

Image 16

Contents HoshizakiHoshizaki America, Inc Stackable Square Cuber Model IM-500SAAComplete and detailed explanation of the problem Phone 1-800-233-1940 770 Fax618 Highway 74 South Peachtree City, GA Attn Hoshizaki Technical Support DepartmentCONTENTS Important Safety Information serious injuryIndicates a situation which could result in damage to the appliance or propertyWARNING, continued A. Construction I. Construction and Water/Refrigeration Circuit Diagram1. Air-Cooled Model SAA B. Water/Refrigeration Circuit Diagram Water TankII. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow ChartShutdown and Restart Sequence Flow Chart IM Control BoardB. Sequence of Operation 1. Startup Cycle2. Harvest Cycle 3. Freeze Cycle4. Shutdown C. Service Diagnosis Table No Ice Production - Possible CauseLow Ice Production - Possible Cause Long Harvest CycleLong Freeze Cycle Slab Does Not Break Into Separate Cubes - Possible CauseCloudy Cubes - Possible Cause D. Bin Control Check and Cleaning 1. Bin Control Check2. Bin Control Cleaning E. Evaporator Thermistor Check III. Controls and Adjustments A. Control Switch B. Control BoardIM Control Board 1. Control Board LayoutPart Number P01873-01 Version 1.3A or Later 2. SERVICE 1 and SERVICE 2 Buttons 1. RESET ButtonC. Control Buttons D. Control Board Settings Freeze Cycle Water Supply Time 1 Partial Drain CB water supply time 1 CB Setting 12 timer terminatesFreeze Cycle Water Supply Time 2 Partial Drain CB Control Board CB Setting Menu E. Control Board Information Display 2. Use the SERVICE 1 and SERVICE 2 buttons to move through the list3. Press the RESET button to view the item’s value 4. Press the RESET button to return to listexample, 655,350 cycles Freeze cycles interrupted by bin control shutdown1.0A, displays as follows 1. Control Board Replacement F. Control Board Model Code Setting2. Checking or Changing the Control Board Model Code Page G. Error Codes H. Quick Adjustments 1. Dimple Diametera To increase dimple diameter b To decrease dimple diameterNormal Position 2. Ice ClarityDrain Position A. Refrigeration Circuit Service Information IV. Refrigeration Circuit and Component Service Information1. Refrigerant Recovery 2. Brazing 3. Evacuation and Recharge R-404AB. Component Service Information Refer to illustration for assembly AssemblyJ. Pump Motor Assembly G. Water Pan AssemblyV. Maintenance 1. Remove the water from the icemaker water supply line VI. Preparing the Icemaker for Periods of Non-Use2. Drain the water tank VII. Disposal VIII. Technical Information A. Specification Data1. IM-500SAA B. Performance Data C. Wiring Diagram 1. IM-500SAA