Hoshizaki M029-897 User Manual

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

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.

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

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.

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.

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

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

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

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

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

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.

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.

+ 27 hidden pages

Hoshizaki M029-897 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual