Hoshizaki M029-897 User Manual

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Page 1

Hoshizaki America, Inc.

Hoshizaki

Stackable Square Cuber

Model IM-500SAA

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number: M029-897 Issued: 2-8-2013 Revised: 5-19-2014

Page 2

WARNING

Only qualied service technicians should install and service the appliance. To obtain the name and phone number of your local Hoshizaki Certied Service Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage. Proper installation is the responsibility of the installer. Product failure or property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the service of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance.

Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsupport@hoshizaki.com

HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269 Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

Page 3

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 4

I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 6

A. Construction .................................................................................................................. 6

B. Water/Refrigeration Circuit Diagram .............................................................................. 7

II. Sequence of Operation and Service Diagnosis ................................................................. 8

A. Sequence of Operation Flow Chart ............................................................................... 8

B. Sequence of Operation ................................................................................................. 9

1. Startup Cycle ............................................................................................................ 9

2. Harvest Cycle .......................................................................................................... 9

3. Freeze Cycle ............................................................................................................ 9

4. Shutdown ............................................................................................................... 10

C. Service Diagnosis Table ...............................................................................................11

D. Bin Control Check and Cleaning ................................................................................. 14

1. Bin Control Check .................................................................................................. 14

2. Bin Control Cleaning .............................................................................................. 15

E. Evaporator Thermistor Check ...................................................................................... 16

III. Controls and Adjustments ............................................................................................... 17

A. Control Switch ............................................................................................................. 17

B. Control Board .............................................................................................................. 17

1. Control Board Layout ............................................................................................. 18

C. Control Buttons ............................................................................................................ 19

D. Control Board Settings ................................................................................................ 20

E. Control Board Information Display .............................................................................. 23

F. Control Board Model Code Setting .............................................................................. 25

1. Control Board Replacement ................................................................................... 25

2. Checking or Changing the Control Board Model Code .......................................... 25

G. Error Codes ................................................................................................................ 27

H. Quick Adjustments ...................................................................................................... 28

1. Dimple Diameter .................................................................................................... 28

2. Ice Clarity .............................................................................................................. 29

IV. Refrigeration Circuit and Component Service Information.............................................. 30

A. Refrigeration Circuit Service Information .................................................................... 30

B. Component Service Information .................................................................................. 32

V. Maintenance .................................................................................................................... 34

VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 35

VII. Disposal ......................................................................................................................... 36

VIII. Technical Information .................................................................................................... 37

A. Specication Data ....................................................................................................... 37

B. Performance Data ....................................................................................................... 38

C. Wiring Diagram ........................................................................................................... 39

Page 4

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic precautions including the following:

• Only qualied service technicians should install and service this appliance.

• The appliance must be installed in accordance with applicable national, state, and local codes and regulations. Failure to meet these code requirements could result in death, electric shock, serious injury, re, or damage to the appliance.

• Electrical connection must be hard-wired and must meet national, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, re, or damage.

• The icemaker requires an independent power supply of proper capacity. See the nameplate for electrical specications. Failure to use an independent power supply of proper capacity can result in a tripped breaker, blown fuse, damage to existing wiring, or component failure. This could lead to heat generation or re.

• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker could result in death or serious injury.

• To reduce the risk of electric shock, do not touch the control switch with damp hands.

• Move the control switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

• Do not make any alterations to the appliance. Alterations could result in electric shock, serious injury, re, or damage.

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WARNING, continued

• The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

• Children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance or allow children or animals to do so. Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance could cause harm to individuals or damage to the appliance.

NOTICE

• Follow the instructions in this manual carefully to reduce the risk of costly water damage.

• In areas where water damage is a concern, install in a contained area with a oor drain.

• Install the appliance in a location that stays above freezing. Normal operating ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the appliance on during extended periods of non-use, extended absences, or in sub-freezing temperatures. To properly prepare the appliance for these occasions, follow the instructions in "VI. Preparing the Icemaker for Periods of Non-Use."

• Do not place objects on top of the appliance.

• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in the dispenser unit/ice storage bin.

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I. Construction and Water/Refrigeration Circuit Diagram

A. Construction

1. Air-Cooled Model (SAA)

Inlet Water Valve

Pump Motor

Actuator Motor

Evaporator

Drain Pan

Control Board Thermistor

Water Plate

Control Box

Thermostatic Expansion Valve

Hot Gas Valve

High-Pressure Switch

Condenser

Fan Motor

Drier

Compressor

Water Tank

Evaporator Thermistor

Fuse Holder

Control Switch

Bin Control

Model Shown: IM-500SAA

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B. Water/Refrigeration Circuit Diagram

1. Air-Cooled Model (SAA)

Inlet Water Valve

Thermostatic Expansion Valve

Evaporator

Evaporator Thermistor

Hot Gas Valve

Strainer

Water Pump

Condenser

Fan Motor

Compressor

Water Tank

Heat Exchanger

Drier

Water Circuit

Refrigerant Circuit

Page 8

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

"IM" Control Board

Cycle Steps

Startup

HGV energized

Shutdown and Restart Sequence Flow Chart

Shutdown and Restart

BC Operation

1. 30-Sec. Startup Cycle

1. Bin Full

2. Harvest Cycle

• HGV: If CBT≤81°F (27°C) (CB Setting

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.

WV Delay PM Delay

WV energized *2

HGV continues AMD energized Comp energized

ET≥41°F (5°C) (CB Setting 1)

Water Tank Closed (Actuator Motor PS)

Comp continues AMU energized FM energized WV energized *3 HGV de-energized

2. Icemaker Off

3. Freeze Cycle

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

PM energized

Comp continues FM continues WV energized *4+*5

3. Ice Level Lowered

ET≤-1.3°F (-18.5°C) (CB Setting 2)

Time varies based on control board calculation

If CBT>81°F (27°C) (CB Setting 74) and CBT≤111°F (44°C) (CB Setting 70), HGV energizes 5sec./de-energizes 25 sec./energizes 5 sec. (CB Setting 71, 72)

Icemaker restarts at

1.30-Sec. Startup Cycle.

Note

Setting

BC open 10 sec. or more

(BC actuator paddle engaged). Shutdown occurs at end of harvest cycle.

Initial Harvest and

Initial Freeze after

Power On

All components de-energized.

BC closed 80 sec. or more (BC actuator paddle disengaged).

Initial Harvest and Initial Freeze after

Bin Control Initiated Restart

Normal Harvest and Freeze

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: AMD–actuator motor down AMU–actuator motor up BC–bin control CBT–control board thermistor Comp–compressor ET–evaporator thermistor FD–full drain (CB Setting 14)

FM–fan motor HGV–hot gas valve PD–partial drain (CB Setting 14) PM–pump motor PS–position sensor WT–water temperature WV–inlet water valve

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B. Sequence of Operation

1. Startup Cycle

When power supply is turned on, "on" appears on CB display and HGV energizes. 30sec. later, harvest cycle starts.

• If the "RESET" button is pressed during 30-sec. startup cycle time, startup cycle ends immediately and harvest cycle starts.

2. Harvest Cycle

HGV continues. Comp and AMD energize. WV energizes as listed in table below.

Initial Harvest

Note

WV Delay NA 20 sec. 0 sec. 0 sec. 20 sec. 20 sec. WV Time after WV Delay WV Time when ET≥41°F (5°C) (CB Setting 1)

Setting

10, 11 95 sec. 10 sec.

NA 10 sec. 0 sec. 10 sec. 0 sec. 10 sec.

after Power On All WT WT>48°F (9°C) WT≤48°F (9°C) WT>48°F (9°C) WT≤48°F (9°C)

Initial Harvest after Bin Control

Initiated Restart

95 sec. 30 sec. 95 sec.

(CB Setting NA)

Normal Harvest

Note: ET temperature is recorded 30 seconds after PM energizes in the preceding

freeze cycle. Water temperature correction value (CB Setting 13) is added to ET temperature and this is used as WT value.

If CBT≤81°F (27°C) (CB Setting 74) at beginning of harvest cycle, HGV repeatedly energizes 40sec./de-energizes 40 sec. If CBT≥118°F (48°C) (CB Setting 34) at beginning of harvest cycle, FM operates continuously in harvest cycle. When ET reaches harvest cycle termination temperature (CB Setting 1) of 41°F (5°C) , HGV de-energizes, FM and AMU energize. Comp continues. WV energizes as listed in table above. Harvest cycle is complete when actuator motor PS indicates water tank is fully closed.

3. Freeze Cycle

Comp and FM continue. WV energizes for total time of WV Time 1 and WV Time 2 listed in table below. PM energizes after PM delay listed in table below.

Note

WV Time 1

and PM Delay

WV Time 2

WV Time 1

and PM Delay

WV Time 2

Setting

12 30 sec. × 2 30 sec. × 2 30 sec.

15 22 sec. × 2 22 sec. × 2 22 sec.

12 60 sec. 60 sec. 60 sec.

15 44 sec. 44 sec. 44 sec.

Initial Freeze after Power On All WT All WT All WT

Initial Freeze after Bin Control

Initiated Restart

Normal Freeze

Page 10

ET temperature is recorded 30 seconds after PM energizes. Water temperature correction value (CB Setting 13) is added to ET temperature and this is used as WT value in following harvest cycle. If CBT>81°F (27°C) (CB Setting 74) and CBT≤111°F (44°C) (CB Setting 70), when ET≤-1.3°F (-18.5°C) (CB Setting 2), HGV energizes 5 sec., de-energizes 25 sec., energizes 5 sec. (CB Settings 71 and 72) to reduce bonding of the water tank to the evaporator. CB monitors time after ET temperature≤32°F (0°C). CB terminates freeze cycle when the following equation is satised:

temp. (absolute value) × time (min.) = (absolute value of CB Setting 2) × (CB Setting 3)

Using default settings, freeze cycle is terminated when:

temp. (absolute value) × time (min.) = 185

This formula helps maintain consistent dimple size regardless of differences in seasonal ambient and water temperatures.

4. Shutdown

When BC is engaged (open) for more than 10 seconds, the icemaker shuts down after harvest cycle. When BC is disengaged (closed) for more than 80 seconds, icemaker restarts at startup cycle. If BC is engaged (open) while the water tank is opening after the power supply is turned on (or after the "RESET" button is pressed), shutdown does not start: Shutdown occurs 10seconds after actuator motor's internal position sensor indicates water tank is fully open.

Legend: AMD–actuator motor down; AMU–actuator motor up; BC–bin control; CB–control

board; CBT–control board thermistor; Comp–compressor; ET–evaporator thermistor; FD–full drain (CB Setting 14); FM–fan motor; HGV–hot gas valve; PM–pump motor; PD–partial drain (CB Setting 14); PS–position sensor; WT–water temperature; WV–inlet water valve

Page 11

C. Service Diagnosis Table

First see "III.G. Error Codes." If there are no recorded errors, refer to the table below.

No Ice Production - Possible Cause

1. Power Supply a) Off, blown fuse, or tripped breaker.

b) Not within specications.

2. Fuse (Control Box) a) Blown.

3. Control Switch a) In "OFF" or "WASH" position.

b) Bad contacts.

4. High-Pressure Switch a) Dirty condenser or air lter.

b) Fan motor not operating.

c) Refrigerant overcharged.

d) Bad contacts.

e) Refrigerant lines or components restricted.

5. Control Transformer (115VAC/10.5VAC)

6. Control Board a) Error. See "III.G. Error Codes."

7. Bin Control See "II.D. Bin Control Check and Cleaning"

8. Water Supply a) Water supply off or improper water pressure.

9. Inlet Water Valve a) Screen or orice restricted.

10. Compressor a) Compressor relay/magnetic contactor contacts bad or coil winding

11. Hot Gas Valve a) Defective.

12. Evaporator (Cube Control) Thermistor See "II.E. Evaporator Thermistor Check"

13. Pump Motor a) Mechanical seal worn out.

14. Thermostatic Expansion Valve a) Bulb loose.

15. Fan Motor a) Defective.

16. Water System a) Water leaks.

a) Coil winding open or shorted.

b) Defective.

a) Tripped with bin lled with ice.

b) Actuator does not move freely.

c) Defective.

b) External water lters restricted.

b) Coil winding open.

open.

b) Start capacitor or run capacitor defective (single phase).

c) Internal protector open.

d) Start relay contacts bad or coil winding open (single phase).

e) Defective.

a) Loose, disconnected, or defective.

b) Defective.

c) Defective capacitor.

b) Defective.

b) Defective capacitor.

Page 12

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up.

2. Refrigerant Charge a) Low.

3. Control Board a) Thermistor connection loose (K3).

b) Defective.

4. Evaporator (Cube Control) Thermistor See "II.E. Evaporator Thermistor Check"

5. Hot Gas Valve a) Erratic or closed.

6. Compressor a) Inefficient or off.

7. Thermostatic Expansion Valve a) Defective.

1. Evaporator a) Scaled up, dirty.

2. Hot Gas Valve a) Defective.

3. Condenser a) Restricted.

4. Control Board a) Defective.

5. Refrigerant Charge a) Low.

6. Thermostatic Expansion Valve a) Bulb loose.

7. Compressor a) Inefficient or off.

a) Loose, disconnected, or defective.

Long Freeze Cycle

b) Defective.

Slab Does Not Break Into Separate Cubes - Possible Cause

1. Spring a) Over-extended.

2. Water Plate a) Obstacle caught between evaporator and water plate.

Cubes Drop Separately - Possible Cause

1. Refrigerant Charge a) Low - Long harvest cycle.

2. Cam Arm a) Worn out.

Imperfect Ice Production - Possible Cause

1. Water Supply a) Improper water pressure.

b) External water lters restricted.

c) Water leaks from water tank or water plate due to broken tank or

plate or icemaker out of level.

2. Inlet Water Valve a) Water leaks from valve body or water supply pipe joint.

3. Water Plate a) Spray holes restricted.

4. Pump Motor a) Defective.

Large-Hole Cubes - Possible Cause (Also see III.H.1. Dimple Diameter")

1. Refrigerant Charge a) Low.

2. Condenser a) Dirty condenser or air lter.

3. Fan Motor a) Defective.

Page 13

Large-Hole Cubes - Possible Cause (Also see III.H.1. Dimple Diameter")

4. Icemaker Location a) Insufficient clearance.

b) Ambient temperature too high.

5. Water Supply a) Water leaks.

b) Improper water pressure.

Cloudy Cubes - Possible Cause

1. Water Quality a) High hardness. See "III.H.2. Ice Clarity."

2. Slush Ice a) Use Anti-Slush Control (Control Board Settings 50 and 51).

Page 14

D. Bin Control Check and Cleaning

1. Bin Control Check

This appliance uses a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required.

To check, 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. Clear any ice away from BC.

4) Check BC wire harness connections.

5) Disconnect BC wire harness connector from CB CN11 connector.

6) Check for continuity across the wires of BC wire harness connector. When the actuator paddle is not engaged, BC switch is closed. If open, check that the wire harness connector is properly connected and that the actuator paddle is not sticking. Clean if necessary. See "II.D.2. Bin Control Cleaning." If BC switch still reads open, replace BC.

7) Press and hold the actuator paddle; check for continuity across the wires of BC wire harness connector. When the actuator paddle is engaged, BC switch is open. If closed, check that the actuator paddle is not restricted. Clean if necessary. See "II.D.2. Bin Control Cleaning." If BC switch still reads closed, replace BC.

8) Reconnect BC wire harness connector to CB CN11 connector, then move the control switch to the "ICE" position. Turn on the power supply.

9) Allow the icemaker to cycle on. Press and hold the actuator paddle for at least 10seconds. The icemaker should shut down. If it does not, replace CB. Note: If BC is engaged (open) while the water tank is opening after the power supply

is turned on (or after the "RESET" button is pressed), shutdown does not start: Shutdown occurs 10seconds after actuator motor's internal position sensor indicates water tank is fully open.

Legend: BC–bin control; CB–control board

Bin Control Bracket

Thumbscrew

Bin Control Cable Connector

Fig. 1

Bin Control

Switch Mount

Actuator Paddle

Magnet

Page 15

2. Bin Control Cleaning

Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In this case, BC should be cleaned.

WARNING

CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the icemaker is serviced. Make sure that none have fallen into the dispense unit/ice storage bin.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Clear any ice away from BC.

4) Carefully remove the BC cable from the cable ties in the evaporator case, then remove the BC from the bin control bracket and move to the front of the icemaker for cleaning.

5) Remove the actuator paddle from the switch mount. See Fig. 1.

6) Wipe down BC with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm water. Rinse the parts thoroughly with clean water.

7) Reassemble BC and replace it in its correct position. Note: If the magnet was removed for cleaning, be sure to replace it in its correct

position.

8) Replace the BC cable into the cable ties in the evaporator case, then move the control switch to the "ICE" position.

9) Conrm CB wire harness connections are secure, then replace the control box cover in its correct position.

10) Turn on the power supply to start the automatic icemaking process.

11) Replace the front panel in its correct position.

Legend: BC–bin control; CB–control board

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

Page 17

III. Controls and Adjustments

A. Control Switch

The control switch has three positions: OFF for power off, ICE for icemaking, and WASH to energize the water pump when cleaning and sanitizing.

B. Control Board

• A Hoshizaki exclusive control board is employed in IM series appliances.

• All models are pretested and factory adjusted.

NOTICE

• Fragile, handle very carefully.

• 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 icemaker when handling or replacing the control board.

• Do not touch the electronic devices on the control board or the back of the control board.

• Do not change wiring and connections.

• Do not short out power supply to test for voltage.

• Always replace the whole control board assembly if it goes bad.

Page 18

1. Control Board Layout

• CN9 Connector

Display Output

• RESET Button

• SERVICE 1 Button

• SERVICE 2 Button

• CN16 Connector

Actuator Motor Position Sensor (Hall IC) Input

• CN11 Connector

Bin Control Input

• CN13 Connector

Evaporator (Cube Control) Thermistor Input

• CN10 Connector

Compressor Start DC Relay Drive Output

• CN4 Connector

Data Input/Output

• CN1 Connector

Control Transformer (10.5VAC) Input

• CN2 Connector

115VAC Input

• F1 Fuse

6.3A, 250VAC

• CN3 Connector

• CN5 Connector

Actuator Motor Output

115VAC Output: Pump Motor; Hot Gas Valve; Fan Motor; Inlet Water Valve; Compressor Relay

"IM" Control Board

Part Number P01873-01 Version 1.3A or Later

Page 19

C. Control Buttons

The control board features RESET, SERVICE 1, and SERVICE 2 Buttons

1. RESET Button

• Press briey to go to initial harvest cycle.

• Press and hold for 3 seconds to enter control board setting mode. For details about control board settings, see "III.D. Control Board Setting Mode and Control Board Settings."

2. SERVICE 1 and SERVICE 2 Buttons

• Press the "SERVICE 1" or "SERVICE 2" button briey to display the current freeze cycle termination temperature (Control Board Setting 2). This setting controls dimple diameter. For details about adjusting the dimple diameter, see "III.H.1. Dimple Diameter." NOTICE! Do not decrease dimple size below 3/16" (5 mm).

• Press and hold the "SERVICE 1" button for 3 seconds to enter information display and model code setting mode. For details about information display and model code setting, see "III.F. Model Code Setting Mode."

Page 20

D. Control Board Settings

NOTICE

Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact your Hoshizaki Service Center.

1) With "on" in display, press and hold the "RESET" button for 3 seconds. Display changes to "1".

2) Use the "SERVICE 1" and "SERVICE 2" buttons to choose a control board setting.

3) Press the "RESET" button to view the setting’s value. Current value ashes in display.

4) Use the "SERVICE 1" and "SERVICE 2" buttons to change value.

5) Press the "RESET" button to select value. Display returns to control board setting number.

6) Once display returns to "on" (20 seconds), the new setting is saved.

Control Board (CB) Setting Menu

IM-500SAA

Category No. Item Range

Basic 1

Water Supply

Harvest Cycle Termination Temperature Temperature to complete harvest cycle.

Freeze Cycle Termination Temperature Integrated with freeze cycle termination time (CB Setting 3) to control length of freeze cycle after evaporator (cube control) thermistor temperature drops to 32°F (0°C). To use this setting for dimple size adjustment, see "III.H.1. Dimple Diameter."

Freeze Cycle Termination Time

Integrated with freeze cycle termination temperature (CB Setting 2) to control length of freeze cycle after evaporator (cube control) thermistor temperature drops to 32°F (0°C).

Ambient Temperature Correction Value for Freeze

Cycle Termination

DO NOT ADJUST

Ambient Temperature Correction Rate for Freeze

Cycle Termination

DO NOT ADJUST

Freeze Cycle Backup Timer

Maximum allowed freeze time to prevent possible freeze-up issues.

Harvest Cycle Water Supply Time: Water

Temperature 48°F (9°C) or Lower When set to "99", inlet water valve energized until harvest cycle termination temperature (CB Setting 1) is reached.

Harvest Cycle Water Supply Time: Water

Temperature Higher Than 48°F (9°C) When set to "99", inlet water valve energized until harvest cycle termination temperature (CB Setting 1) is reached.

2 to 20°C (1°C increments)

-5 to -40°C (0.5°C increments. The "." in the lower, right corner of the display indicates .5°C.)

5 to 90 min. (1 min. increments)

10 to 50°C (1°C increments)

10 to 100% (00 = 100) (1% increments)

45 to 90 min. (5 min. increments)

1 to 99 sec, 99 = continuous (1 sec. increments)

Default

-18.5

100

Page 21

Control Board (CB) Setting Menu

Category No. Item Range

Water Supply, continued

Other 21

Model 30

Harvest Cycle High Temperature Control

Water Regulating Valve

Freeze Cycle Water Supply Time 1: Partial Drain (CB Setting 14)

Freeze Cycle Water Supply Time 1: Full Drain (CB Setting 14)

Water Temperature Correction Value

Value added to correct the difference between the temperature at the evaporator (cube control) thermistor and actual water supply temperature.

Partial/Full Drain Selection

Controls timing for inlet water valve and pump motor in the freeze cycle. Partial Drain: Pump motor energizes after freeze cycle water supply time 1 (CB Setting 12) timer terminates. During the rst freeze cycle after startup or following a bin control initiated shutdown and restart, freeze cycle water supply times 1 and 2 (CB Settings 12 and 15) are doubled. Full Drain: Pump motor energizes after freeze cycle water supply time 1 (CB Setting 12) timer terminates. If full drain is selected, change freeze cycle making water supply times 1 and 2 (CB Settings 12 and 15) to the full drain times listed in this table and move the water tank drain pipe to the drain position. For details, see "III.H.2. Ice Clarity."

Freeze Cycle Water Supply Time 2: Partial Drain (CB

Setting 14)

Freeze Cycle Water Supply Time 2: Full Drain (CB Setting 14)

Stackable Bin Control Allows for stacked units to be controlled through one bin control.

DO NOT ADJUST

Refrigeration Circuit Cycling when Bin Full

DO NOT ADJUST

Type 0: WC, PS, No CondTherm, Ignore CB Setting 34 1: AC, No PS, No CondTherm, Use CB Setting 34 2: AC, No PS, CondTherm, Use CB Setting 34 3: AC, PS, No CondTherm, Use CB Setting 34

DO NOT ADJUST

Harvest Cycle High Temperature Control Active if type setting (CB Setting 30) is set to 1, 2, or 3. If control board thermistor temperature at the beginning of harvest cycle is equal to or greater than the harvest cycle high temperature control setting, fan motor operates continuously in harvest cycle.

Water Regulating Valve Error Detection Temperature

DO NOT ADJUST

0 to 90 sec. (1 sec. increments)

+0 to +20°C (1°C increments)

Partial=1; Full=0 1

0 to 90 sec. (1 sec. increments)

Yes=1; No=0 1

On=1; Off=0 0

0 to 3 3

40 to 70°C (1°C increments)

0 to 50°C 0=ignore, air-cooled model (1°C increments)

IM-500SAA

Default

Page 22

Control Board (CB) Setting Menu

Category No. Item Range

Compressor 37

Anti-Slush Control

Hard Water Control

Water Tank Ice Control7071

Water Tank Ice Control & Ice Bridge Control

Water Tank Ice Control

Ice Bridge Control

Compressor Output Selection

DO NOT ADJUST

Pump De-Energized Time

When temperature at evaporator (cube control) thermistor drops to 37°F (3°C) in the freeze cycle, pump de-energizes for the length of time set.

Anti-Slush Control Water Supply Time

Time inlet water valve is energized while pump is de-energized if pump de-energized time (CB Setting

50) is greater than 0.

Integrated Value

If hard water control water supply time (CB Setting

61) is greater than 0: After evaporator (cube control) thermistor indicates temperature of 32°F (0°C) in freeze cycle, inlet water valve energized starting when percentage of freeze cycle termination temperature and freeze cycle time integrated value has been achieved.

DO NOT ADJUST

Hard Water Control Water Supply Time

Time inlet water valve is energized after integrated value (CB Setting 60) conditions are met. Before using this setting, follow the instructions to improve ice clarity; see "III.H.2. Ice Clarity."

If control board thermistor temperature is above the water tank ice control lower temperature setting

(CBSetting 74) and equal to or less than the

water tank ice control upper temperature setting (CB Setting 70) when freeze cycle termination temperature (CB Setting 2) is met, the hot gas valve energizes/de-energizes/energizes for the times set by the hot gas valve energized/de-energized times (CB Settings 71 and 72) to reduce bonding of the water tank to the evaporator.

Water Tank Ice Control Upper Temperature

See CB Setting 70, 71, 72, 74 description above. Ice Bridge Control Temperature See CB Setting 73 description below.

Water Tank Ice Control Hot Gas Valve Energized

Time See CB Setting 70, 71, 72, 74 description above.

Water Tank Ice Control Hot Gas Valve De-Energized

Time See CB Setting 70, 71, 72, 74 description above.

Ice Bridge Control Hot Gas Valve De-Energized Time

Time hot gas valve is de-energized after 20 sec. in harvest cycle if control board thermistor temperature is above the ice bridge control temperature (CBSetting 70) when freeze cycle termination temperature (CB Setting 2) is met.

0: X8 (DC Relay) On 1: X1 (AC Relay) On

0 to 90 sec. 0=ignore, no anti-slush (1 sec. increments)

0 to 5 sec. (1 sec. increments)

10 to 100% (00=100) (1% increments)

0 to 90 sec. (1 sec. increments)

See Ranges Below See

10 to 60°C (1°C increments)

0 to 20 sec. (1 sec. increments)

10 to 60 sec. (1 sec. increments)

0 to 30 sec. (1 sec. increments)

IM-500SAA

Default

Defaults Below

Page 23

Control Board (CB) Setting Menu

IM-500SAA

Category No. Item Range

Water Tank Ice Control & Harvest Cycle Low Temperature Control

Water Tank Ice Control Lower Temperature

See CB Setting 70, 71, 72, 74 description above. Harvest Cycle Low Temperature Control If control board thermistor temperature at the beginning of harvest cycle is equal to or less than the harvest cycle low temperature control setting, hot gas valve repeatedly energizes for 40 seconds then de-energizes for 40 seconds to promote a balanced harvest across the evaporator plate.

0 to 40°C (1°C increments)

Default

E. Control Board Information Display

1. With unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes to "n1".

2. Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list.

3. Press the "RESET" button to view the item’s value.

4. Press the "RESET" button to return to list.

5. Display returns to normal if no buttons are touched for 20 seconds.

Control Board Information Display

No. Item Description

Freeze Cycle Time

During Freeze Cycle: Time since freeze cycle started. After Freeze Cycle: Time of previous freeze cycle.

Freeze Cycle Completion Rate

During Freeze Cycle: Percent of freeze cycle completed. After Freeze Cycle: Percent of previous freeze cycle completed.

Current Evaporator (Cube Control) Thermistor

Temperature

Current Control Board Thermistor Temperature °C No

Water Temperature Temperature at evaporator (cube control) thermistor 30 seconds after pump motor energized in freeze cycle plus the water temperature correction value (Control Board Setting 13).

Current Condenser Thermistor Temperature

Not Applicable to IM-500SAA

0 to 99 min. No

0 to 100% 00 = 100%

°C No

"H" if Higher than 48°F (9°C) "L" if 48°F (9°C) or Lower

°C No

History Cleared by Pressing and Holding SERVICE 1 and SERVICE 2 Buttons Simultaneously for 5Sec. when Item Value is Displayed?

Page 24

Control Board Information Display

No. Item Description

Last Completed Freeze Cycle Time

Freeze cycles interrupted by bin control shutdown or the "RESET" button are not recorded.

Number of Completed Freeze Cycles Since Last

Counter Reset Counter updates every 10 freeze cycles. Freeze cycles interrupted by bin control shutdown or the "RESET" button are not recorded.

Total Number of Completed Freeze Cycles

Counter updates every 10 freeze cycles. Freeze cycles interrupted by bin control shutdown or the "RESET" button are not recorded.

Error Log

Displays up to 5 errors with the most recent error rst. For error details, see "III.G. Error Codes."

Firmware Version

Displays control board's rmware version.

Model Code

The model code puts all settings for a given model to the correct default settings. The model code setting mode should only be used when the control board has been changed, the model code is incorrect, or to reset all settings to the default. For details about the model code setting mode, see "III.F. Model Code Setting Mode."

0 to 99 min. Yes

Displays up to 999,999 cycles. Displays two digits at a time. For example, 655,350 cycles display as follows: 65>off>53>off>50>off>- (repeat)

For example, E5 (most recent), E4, E3, E2, E1 (least recent of up to 5 errors) displays as follows: E5>off>E4>off>E3>off>E 2>off>E1>off>- - (repeat)

For example, version

1.0A, displays as follows:

01.>off>0A>off>- (repeat)

Displays two-character model code. "00" to "FF"

History Cleared by Pressing and Holding SERVICE 1 and SERVICE 2 Buttons Simultaneously for 5Sec. when Item Value is Displayed?

Ye s

Page 25

F. Control Board Model Code Setting

1. Control Board Replacement

WARNING

• This appliance should be diagnosed and repaired only by qualied service personnel to reduce the risk of death, electric shock, serious injury, or re.

• Move the control switch to the "OFF" position and turn off the power supply. Place the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

1) Move the control switch to the "OFF" position and turn off the power supply. Place the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

2) Remove the front cover and control box cover.

3) Disconnect all the connectors from the control board.

4) Remove the old control board and install the new control board (

or Later).

5) Connect the connectors to the new control board.

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

7) Turn on the power supply, then move the control switch to the "ICE" position.

8) "00" appears in the display of the new control board.

9) Press the "SERVICE 1" button to increase the rst digit in the display and the "SERVICE2" button to increase the second digit. Digits appear in the following order:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. When a valid model code is displayed, the dot in the bottom right of the display turns on. For IM-500SAA, set model code to "08".

10) When the desired model code is displayed, press the "RESET" button to save the setting. "on" appears in the display.

11) Replace the front panel in its correct position.

2. Checking or Changing the Control Board Model Code

1) With unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes to "n1".

2) Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list until "h6" is displayed.

P01873-01 Version 1.3A

3) Press the "RESET" button to view the current model code. To change the model code, continue through the remaining steps; otherwise, the display returns to normal if no buttons are touched for 20 sec.

4) Press and hold the "SERVICE 1" and "SERVICE 2" buttons simultaneously for 15 sec. "00" appears in display.

Page 26

5) Press the "SERVICE 1" button to increase the rst digit in the display and the "SERVICE2" button to increase the second digit. Digits appear in the following order:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. When a valid model code is displayed, the dot in the bottom right of the display turns on. For IM-500SAA, set model code to "08".

6) When the desired model code is displayed, press the "RESET" button to save the setting. "on" appears in the display.

Page 27

G. Error Codes

When the control board detects an error, the display shows one of the following error codes in the display mode. Error codes other than E1 and E2 are displayed as "EE" at the time of occurrence. To see the actual error code, see the error log.

1. With the unit on, press and hold the "SERVICE 1" button for 3 seconds. Display changes to "n1".

2. Use the "SERVICE 1" and "SERVICE 2" buttons to move through the list until "h4" is displayed.

3. Press the "RESET" button to view the error log. Displays up to 5 errors with the most recent error rst.

4. Press the "RESET" button to return to list. To clear error log history, press and hold the "SERVICE1" and "SERVICE 2" buttons simultaneously for 5 sec.

5. Display returns to normal if no buttons are touched for 20 sec.

Error Codes

Error Code

EE (E3)

EE (E4)

Problem Corrective Action/Reset Details

Freeze Cycle Backup Timer Freeze cycle backup timer (Control Board Setting

6) has terminated. 45 min. after water tank starts to close in preceding harvest cycle, unit stops if the evaporator temperature is above 32°F (0°C).

Harvest Cycle Backup Timer Harvest cycle backup timer has terminated. 30 min. after water tank starts to open in harvest cycle, unit stops if harvest cycle termination temperature (Control Board Setting 1) has not been reached.

Water Tank Opening Backup Timer 3-minute opening backup timer starts when water tank starts to open. If actuator motor's internal position sensor does not indicate water tank is fully open within 3minutes, display shows "EE" and unit stops for 60 minutes. If error recurs after unit resumes operation, display shows "EE" and unit shuts down.

Water Tank Closing Backup Timer 3-minute closing backup timer starts when water tank starts to close. If actuator motor's internal position sensor does not indicate water tank is fully closed within 3minutes, display shows "EE" and unit stops for 60 minutes. If error recurs after unit resumes operation, display shows "EE" and unit shuts down.

Check for inlet water valve leaking by, hot gas valve leaking by, pump motor not pumping, thermostatic expansion valve not feeding properly, low charge, or inefficient compressor.

Press the "RESET" button to reset.

Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefficient compressor.

Press the "RESET" button to reset.

Check actuator motor and control board.

Press the "RESET" button to reset.

Check actuator motor and control board.

Press the "RESET" button to reset.

Page 28

Error Codes

Error Code

EE (E5)

EE (E9)

EE (EA)

EE (EC)

EE (Ed)

Problem Corrective Action/Reset Details

High Evaporator Temperature If evaporator temperature 140°F (60°C) or higher for 5sec., unit stops.

Condenser Thermistor Error If condenser thermistor is open or shorted for 2sec., unit stops. Note: IM-500SAA does not utilize a condenser thermistor, therefore E9 error will not occur.

Control Board Error If model data IC is defective, unit stops.

Evaporator (Cube Control) Thermistor Error If evaporator thermistor is open or shorted for 2sec., unit stops.

Water Regulating Valve Error If water regulating valve thermistor detects a temperature below the water regulating valve error detection temperature (Control Board Setting 36), error is displayed but unit continues to operate. Note: IM-500SAA does not utilize a water regulating valve, therefore Ed error will not occur.

Check for harvest problem (stuck HGV or control board relay), hot water entering unit, or shorted thermistor.

Press the "RESET" button to reset.

Replace condenser thermistor.

Replace control board.

Replace evaporator thermistor.

Check water regulating valve.

Press the "RESET" button to reset.

H. Quick Adjustments

1. Dimple Diameter The factory set dimple diameter is 3/16" (5 mm). NOTICE! Do not decrease the dimple diameter below 3/16" (5 mm).

a) To increase dimple diameter:

1) Remove front panel.

2) Press the "SERVICE 1" button to view the current freeze cycle termination temperature setting.

3) Press the "SERVICE 1" button to raise freeze cycle termination temperature setting (Control Board Setting 2). Temperature setting rises in .5°C increments. The "." in the lower, right corner of the display indicates .5°C. Default is -18.5°C. For reference, raising freeze cycle termination temperature setting to -13°C will result in a dimple diameter of approximately 3/8" (10mm).

4) Once the display returns to "on" (20 seconds), the new setting is saved.

b) To decrease dimple diameter:

1) Remove front panel.

2) Press the "SERVICE 2" button to view the current freeze cycle termination temperature setting.

Page 29

3) Press the "SERVICE 2" button to lower freeze cycle termination temperature setting (Control Board Setting 2). Temperature setting lowers in .5°C increments. The "." in the lower, right corner of the display indicates .5°C. Default is -18.5°C. NOTICE! Do not

decrease dimple size below 3/16" (5 mm).

4) Once the display returns to "on" (20 seconds), the new setting is saved.

2. Ice Clarity

In hard water conditions, white ice may be produced. In such cases, install a water lter and/or water softener, then follow the instructions below.

1) Move the control switch to the "OFF" position, then turn off the power supply.

2) Remove the front panel.

3) Remove the screw, then move the water tank drain pipe to the drain position. See Fig. 2. Use the screw to secure the water tank drain pipe in the drain position.

4) Turn on the power supply, then move the control switch to the "ICE" position.

5) Press and hold the "RESET" button for 3 seconds. "1" appears in the display.

6) Press the "SERVICE 1" button until "12" appears in the display. Press the "RESET" button. The current icemaking water supply time value ashes in the display. Press the "SERVICE 1" or "SERVICE 2" buttons to change the setting to "60".

7) Press the "RESET" button to save the setting and return to the menu.

8) Using the same procedure as above, change the full/partial drain setting (Control Board Setting 14) from "1" (partial drain) to "0" (full drain).

9) Using the same procedure as above, change the additional icemaking water supply time setting (Control Board Setting 15) to "44".

10) Once the display returns to "on" (20 seconds), the new setting is saved.

11) Replace the front panel in its correct position. Note: If white ice continues to be an issue, set hard water setting water supply time

(Control Board Setting 61) to "15". This results in the inlet water valve energizing for 15 seconds part way through the freeze cycle and diluting the water in the water tank. Do not increase this setting beyond 15 seconds; otherwise, freeze cycle times may become long and bridging may occur in the ice storage bin.

Normal Position

Screw

Drain Position

Water Tank Drain Pipe

Fig. 2

Page 30

IV. Refrigeration Circuit and Component Service Information

WARNING

• This appliance should be diagnosed and repaired only by qualied service personnel to reduce the risk of death, electric shock, serious injury, or re.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the icemaker is serviced. Make sure that none have fallen into the dispenser unit/ice storage bin.

• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are clean after service.

A. Refrigeration Circuit Service Information

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA-certied service personnel.

• 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.

NOTICE

• Always recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

• Do not leave the system open for longer than 15 min. when replacing or servicing parts. The Polyol Ester (POE) oils used in R-404A applications can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.

• Always install a new drier every time the sealed refrigeration system is opened. 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 ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).

1. Refrigerant Recovery

The icemaker is provided with refrigerant access valves. Using proper refrigerant practices, recover the refrigerant. Store the refrigerant in an approved container. Do not discharge the refrigerant into the atmosphere.

Page 31

2. Brazing

WARNING

• R-404A itself is not ammable at atmospheric pressure and temperatures up to 176°F (80°C).

• R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open ames), R-404A can be decomposed to form hydrouoric acid and carbonyl uoride both of which are hazardous.

• Do not use silver alloy or copper alloy containing arsenic.

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG. Note: Because the pipes in the evaporator case are specially coated to resist corrosion,

it is important to make connections outside the evaporator case when possible. If it is necessary to braze inside the evaporator case, use sandpaper to remove the coating from the brazing connections before unbrazing the components.

NOTICE

• Always install a new drier every time the sealed refrigeration system is opened.

• 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 ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).

2) 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.

3. Evacuation and Recharge (R-404A)

1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both high and low-side refrigerant access valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for POE oils.

2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the vacuum pump to ow backwards.

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity.

4) Close the low-side valve and high-side valve on the gauge manifold.

Page 32

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the nameplate. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.

6) A liquid charge is required when charging an R-404A system (to prevent fractionation). Place the service cylinder on the scales; if the service cylinder is not equipped with a dip tube, invert the service cylinder, then place it on the scales. Open the high-side valve on the gauge manifold.

7) Allow the system to charge with liquid until the proper charge weight is met.

8) If necessary, add any remaining charge to the system through the low-side.

NOTICE!To prevent compressor damage, use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side refrigerant access valve with the icemaker running.

9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold hoses.

10) Cap the refrigerant access valves to prevent a possible leak.

B. Component Service Information

NOTICE

When replacing a component listed below, see the notes to help ensure proper operation.

Component Notes

Compressor Install a new start capacitor, run capacitor, and start relay.

Thermostatic Expansion Valve

Hot Gas Valve • Replace the strainer if applicable.

Fan Motor Install a new capacitor.

Pump Motor Install a new capacitor.

Actuator Motor Install a new capacitor.

Evaporator (Cube Control) Thermistor

• Attach the thermostatic expansion valve bulb to the suction line in the same location as the previous bulb.

• The bulb should be between the 10 and 2 o'clock positions on the tube.

• Secure the bulb with the clamp and holder, then insulate it.

• Use copper tube of the same diameter and length when replacing valve lines.

• Attach the new thermistor to the same location on the evaporator as the previous thermistor.

• Smoothly ll the recessed area of the thermistor holder with high thermal conductive type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound 10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu Silicones), or equivalent are recommended.

• Attach the new thermistor in position on the evaporator and press down the thermistor holder over the thermistor.

• Be very careful to prevent damage to the leads.

Page 33

Water Pan Assembly

Refer to illustration for assembly.

1. Water Tank

2. Water Plate Bracket

3. Bracket

4. Spring Hook Screw

5. Pump Tubing (Suction)

6. Pump Tubing (Discharge)

7. Pump Motor Bracket

8. Water Plate

9. Overow Pipe

10. Screw (for Overow Pipe)

11. Nylon Tie

12. O-ring

J. Pump Motor Assembly

S1-4. Tapping Screw S5. Machine Screw

Icemaking Assembly and Cam Mechanism

Refer to illustration for assembly.

G. Water Pan Assembly

1. Evaporator

2. Bolt

3. Collar (Spacer)

4. Bearing

5. Actuator Motor

7. Shaft

9. Actuator Motor Bracket

10. Cam Shaft Bearing

11. Spring Pin

13. Cam Arm (B)

14. Cam Shaft

15. Snap Pin

16. Split Pin

17. Spring

18. Washer (A)

19. Washer (B)

20. Washer (C)

21. Thermistor Holder

22. Label (for Overow Pipe)

23. Thermistor (Cube Control)

26. Frame

27. Frame

28. Wire Saddle

29. Washer

30. Cam Arm (A)

31. Change Lever S1-5. Machine Screw

Page 34

V. Maintenance

The maintenance schedule below is a guideline. More frequent maintenance may be required depending on water quality, the appliance's environment, and local sanitation regulations

WARNING

• Only qualied service technicians should service the appliance.

• To reduce the risk of electric shock, do not touch the control switch or service switch with damp hands

• Before servicing: Move the control switch to the "OFF" position and turn off the power supply. Place the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after any maintenance is done to the icemaker. Make sure that none have fallen into the dispenser unit/ice storage bin.

Maintenance Schedule

Frequency Area Task

Daily Scoop Clean the ice scoop using a neutral cleaner. Rinse thoroughly after

cleaning. Bi-Weekly Air Filters Inspect. Wash with warm water and neutral cleaner if dirty. Monthly External Water

Filters Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a

Yearly Icemaker and

Dispenser Unit/Ice Storage Bin Liner

Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water

Condenser Inspect. Clean if necessary by using a brush or vacuum cleaner. More

Water Hoses Inspect the water hoses and clean/replace if necessary.

Check for proper pressure and change if necessary.

neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining

(rust colored spots) using a non-abrasive cleanser.

Clean and sanitize per the cleaning and sanitizing instructions provided

in the instruction manual or maintenance label on the icemaker.

system. Clean the water supply inlet screen.

frequent cleaning may be required depending on location.

Page 35

VI. Preparing the Icemaker for Periods of Non-Use

NOTICE

• When storing the appliance for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage.

• To prevent damage to the water pump, do not operate the appliance with the control switch in the "WASH" position when the water tank is empty.

When the appliance is not used for two or three days under normal conditions, it is sufficient to move the control switch to the "OFF" position. When storing the appliance for an extended time or in sub-freezing temperatures, follow the instructions below.

1. Remove the water from the icemaker water supply line:

1) Turn off the power supply.

2) Move the control switch to the "OFF" position.

3) Close the icemaker water supply line shut-off valve and open the icemaker water supply line drain valve.

4) Allow the icemaker water supply line to drain by gravity.

5) Attach compressed air or carbon dioxide supply to the icemaker water supply line drain valve.

6) Move the control switch to the "ICE" position and turn on the power supply.

7) Blow the icemaker water supply line out using compressed air or carbon dioxide.

2. Drain the water tank:

1) Turn off the power supply.

2) Remove the front panel.

3) Remove the screw, and move the tank drain pipe to the drain position.

4) Close the icemaker water supply line.

5) Turn on the power supply.

6) Press the the "RESET" button. The water tank will start to open. Note: This procedure is necessary to protect the icemaker from freezing up at

subfreezing temperatures.

7) Turn off the power supply when the water tank has fully opened.

8) Move the tank drain pipe to the normal position, and secure it with the screw.

9) Replace the front panel.

Page 36

VII. Disposal

The appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations. Refrigerant must be recovered by properly certied service personnel.

Page 37

VIII. Technical Information

We reserve the right to make changes in specications and design without prior notice.

A. Specication Data

1. IM-500SAA

AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACIT MAXIMUM FUSE SIZE APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *500 (227) 481 (218) 447 (203) Reference without *marks 80 485 (220) 456 (207) 417 (189)

SHAPE OF ICE ICE PRODUCTION PER CYCLE APPROXIMATE STORAGE CAPACITY ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 990(5.45) 920(4.40) WATER gal./24HR (gal./100 lbs.) 86(19.8) 105(21.0) CEC/CEE TIER LEVEL ENERGY STAR YES EXTERIOR DIMENSIONS (WxDxH) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT CONNECTIONS - ELECTRIC

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT CUBE CONTROL SYSTEM HARVESTING CONTROL SYSTEM Hot Gas, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe COOLING WATER CONTROL N/A BIN CONTROL SYSTEM COMPRESSOR CONDENSER EVAPORATOR REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE DESIGN PRESSURE P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal ) COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal ) REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch LOW WATER PROTECTION ACCESSORIES -SUPPLIED

-REQUIRED Ice Storage Bin OPERATING CONDITIONS VOLTAGE RANGE

115/60/1

11.5 A ( 5 Min. Freeze AT 104°F / WT 80°F) 20 A 20

90 481 (218) *435 (197) 397 (180)

100 471 (214) 426 (193) *363 (165)

Cube Ice

6.9.lbs. (3.15kg) 140 pcs. N

44" x 27.6" x 21.7" (1118 x 700 x 550 mm)

Net 196 lbs. (89 kg), Shipping 220 lbs. (100 kg) Permanent-Connection

Thermistor and Timer

Mechanical Level Switch with Delay Hermetic, Model NT6222GKV

ir-Cooled, Fin and tube type

Cell type, Coppe

R-404A 1lb, 10.5oz (750g) High 350PSIG, Low 220PSIG

AMBIENT TEMP. 45 -100° F WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE

and Tin dipping

104 - 127 V

10 - 113 PSIG

Page 38

B. Performance Data

Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be used for reference only.

1. IM-500SAA

APPROXIMATE ICE PRODUCTION PER 24 HR.

lbs./day kg./da APPROXIMATE ELECTRIC

CONSUMPTION

watts 100/38 APPROXIMATE WATER CONSUMPTION PER 24 HR.

gal./day m3/day FREEZING CYCLE TIME

min. 100/38 HARVEST CYCLE TIME

min. 100/38 HEAD PRESSURE

PSIG kg/cm2G SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC)

70/21 500 227 481 218 447 203 80/27 485 220 456 207 417 189

90/32 481 218 435 197 397 180

100/38 471 214 426 193 363 165

70/21 80/27 90/32

70/21 105 0.40 80/27 101 0.38 92 0.35 84 0.32 90/32 99 0.38 86 0.33 78 0.30

100/38 91 0.34 84 0.32 71 0.27

70/21 80/27

90/32

70/21 80/27

90/32

70/21 210 14.8 80/27 226 15.9 260 18.2 281 19.7 90/32 231 16.3 283 19.9 306 21.5

100/38 234 16.5 288 20.3 327 23.0

70/21 42 3.0 45 3.1 48 3.4 80/27 44 3.1 48 3.4 52 3.6 90/32 45 3.1 51 3.6 55 3.8

100/38 45 3.2 52 3.6 58 4.1

WATER TEMP. (ºF/ºC)

50/10 70/21 90/32

920

936 941 945

18 18 19

3.6

3.2

3.0 1.5

2.4

941 968

990

996

99 0.38 92 0.35

18 20

3.0

2.2

1.6

231 16.3 255 18.0

967 993

1016

1040

20 23

2.0

1.4

TOTAL HEAT OF REJECTION FROM CONDENSER 4,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)] TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

Page 39

C. Wiring Diagram

1. IM-500SAA

Hoshizaki M029-897 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual