Hoshizaki M029-897 II. Sequence of Operation and Service Diagnosis, IM Control Board

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II. Sequence of Operation and Service Diagnosis

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

"IM" Control Board

Cycle

 

1. 30-Sec.

2. Harvest Cycle

3. Freeze Cycle

 

Steps

 

Startup

• HGV: If CBT≤81°F (27°C) (CB Setting

• Max. freeze time: 45 min. (CB Setting 6)

 

 

Cycle

74), HGV repeatedly energizes 40 sec./

 

 

 

 

de-energizes 40 sec.

 

FM: If CBT≥118°F (48°C) (CB Setting 34), FM operates continuously in harvest cycle

 

 

 

 

 

• Max. harvest time: 30 min.

 

 

 

 

ET≤-1.3°F (-18.5°C)

 

 

 

 

WV Delay

ET≥41°F (5°C)

PM Delay

(CB Setting 2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(CB Setting 1)

 

 

 

 

 

 

 

Time varies based on

 

 

 

 

 

*1

 

 

*4

 

 

 

Startup

 

 

 

 

 

 

 

 

 

 

 

 

 

control board calculation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Water Tank Closed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HGV energized

 

WV energized *2 (Actuator Motor PS)

 

PM energized

If CBT>81°F (27°C) (CB

 

 

 

 

 

HGV continues

Comp continues

Comp continues

Setting 74) and CBT≤111°F

 

 

 

 

 

AMD energized

AMU energized

FM continues

 

(44°C) (CB Setting 70), HGV

 

 

 

 

 

Comp energized

FM energized

WV energized *4+*5

energizes 5 sec./de-energizes

 

 

 

 

 

 

 

 

 

WV energized *3

 

 

 

 

 

25 sec./energizes 5 sec. (CB

 

 

 

 

 

 

 

 

 

HGV de-energized

 

 

 

 

 

Setting 71, 72)

Shutdown and Restart Sequence Flow Chart

Shutdown

 

1. Bin Full

2. Icemaker Off 3. Ice Level Lowered

 

and Restart

 

 

BC Operation

 

 

 

 

 

 

 

BC open 10 sec. or more

All components

BC closed 80 sec. or more

 

 

 

 

(BC actuator paddle

de-energized.

(BC actuator paddle

 

 

engaged). Shutdown

 

disengaged).

 

 

occurs at end of harvest

 

 

 

 

 

cycle.

 

 

 

Icemaker restarts at

1. 30-Sec. Startup Cycle.

 

 

 

Initial Harvest and

Initial Harvest and Initial Freeze after

 

 

 

CB

 

Initial Freeze after

 

Normal Harvest and Freeze

Note

Setting

 

Power On

 

Bin Control Initiated Restart

 

 

 

 

 

All WT

 

WT>48°F (9°C)

WT≤48°F (9°C)

WT>48°F (9°C)

WT≤48°F (9°C)

*1

NA

 

20 sec.

 

0 sec.

0 sec.

20 sec.

20 sec.

*2

10, 11

 

95 sec.

 

10 sec. (CB Setting NA)

95 sec.

30 sec.

95 sec.

*3

NA

 

10 sec.

 

0 sec.

10 sec.

0 sec.

10 sec.

PD*4

12

 

30 sec. × 2

 

30 sec. × 2

30 sec. × 2

30 sec.

30 sec.

PD*5

15

 

22 sec. × 2

 

22 sec. × 2

22 sec. × 2

22 sec.

22 sec.

FD*4

12

 

60 sec.

 

60 sec.

60 sec.

60 sec.

60 sec.

FD*5

15

 

44 sec.

 

44 sec.

44 sec.

44 sec.

44 sec.

 

 

 

 

 

 

 

 

 

 

Legend:

 

FM–fan motor

 

 

 

 

AMD–actuator motor down

 

 

 

 

AMU–actuator motor up

HGV–hot gas valve

 

 

 

 

BC–bin control

 

PD–partial drain (CB Setting 14)

 

 

 

CBT–control board thermistor

PM–pump motor

 

 

 

 

Comp–compressor

PS–position sensor

 

 

 

 

ET–evaporator thermistor

WT–water temperature

 

 

 

 

FD–full drain (CB Setting 14)

WV–inlet water valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

Image 8
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 1. Air-Cooled Model SAA I. Construction and Water/Refrigeration Circuit DiagramA. Construction 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 BoardPart Number P01873-01 Version 1.3A or Later 1. Control Board LayoutIM Control Board C. Control Buttons 1. RESET Button2. SERVICE 1 and SERVICE 2 Buttons D. Control Board Settings Freeze Cycle Water Supply Time 2 Partial Drain CB water supply time 1 CB Setting 12 timer terminatesFreeze Cycle Water Supply Time 1 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 list1.0A, displays as follows Freeze cycles interrupted by bin control shutdownexample, 655,350 cycles 2. Checking or Changing the Control Board Model Code F. Control Board Model Code Setting1. Control Board Replacement Page G. Error Codes H. Quick Adjustments 1. Dimple Diametera To increase dimple diameter b To decrease dimple diameterDrain Position 2. Ice ClarityNormal Position 1. Refrigerant Recovery IV. Refrigeration Circuit and Component Service InformationA. Refrigeration Circuit Service Information 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 2. Drain the water tank VI. Preparing the Icemaker for Periods of Non-Use1. Remove the water from the icemaker water supply line VII. Disposal 1. IM-500SAA A. Specification DataVIII. Technical Information B. Performance Data C. Wiring Diagram 1. IM-500SAA