Hoshizaki KM-1301SAH-3, SRH-3 KM-1900SAH-3, SRH-3 KM-1400SWH-M, SRH3 KMH-2000SWH-3, SRH-3 KM-2100SWH3 User Manual

...

Hoshizaki America, Inc.

Hoshizaki

Stackable Crescent Cuber

Models KM-1301SAH/3, SWH/3, SRH/3 KM-1400SWH-M, SWH3-M KM-1601SAH/3, SWH/3, SRH/3

“A Superior Degree

of Reliability”

www.hoshizaki.com

KM-1900SAH/3, SWH/3, SRH/3 KM-2100SWH3, SRH3 KM-2500SWH3, SRH3 KMH-2000SWH/3, SRH/3

SERVICE MANUAL

Number: 73197 Issued: 8-16-2013 Revised: 1-10-2014

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 ................................................................................................. 6

I. Construction and Water/Refrigeration Circuit Diagram

A. KM Construction............................................................................................................ 8

1. Air-Cooled Models (SAH/3) ...................................................................................... 8

2. Water-Cooled Models (SWH/3/-M) .......................................................................... 9

3. Remote Models (SRH/3)

B. KMH Construction

1. Water-Cooled Models (SWH/3)

2. Remote Models (SRH/3) ....................................................................................... 12

C. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (SAH/3) .................................................................................... 13

2. Water-Cooled Models (SWH/3/-M) ........................................................................ 14

3a. Remote Models (SRH/3) Except KM-2500SRH3

3b. Remote Models (SRH3) KM-2500SRH3 ............................................................. 16

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart ............................................................................. 17

1. "E" and "G" Control Board without Harvest Pump Timer Operation ....................... 17

2. "G" Control Board with Harvest Pump Timer Operation

B. Service Diagnosis ....................................................................................................... 19

1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis

2. "G" Control Board with Harvest Pump Timer Diagnosis ........................................ 25

C. Control Board Check ................................................................................................... 31

D. Bin Control Check

E. Float Switch Check and Cleaning ............................................................................... 33

1. Float Switch Check

2. Float Switch Cleaning ............................................................................................ 34

F. Thermistor Check ......................................................................................................... 35

G. Diagnostic Tables

III. Controls and Adjustments ............................................................................................... 40

A. Control Board Layout

1. "E" Control Board .................................................................................................. 41

2. "G" Control Board ................................................................................................. 42

B. LED Lights and Audible Alarm Safeties

1. "E" Control Board .................................................................................................. 43

2. "G" Control Board

........................................................................................................11

....................................................................................................... 32

................................................................................................ 33

........................................................................................................ 36

.................................................................................................. 41

................................................................................................. 44

....................................................................................... 10

...............................................................................11

............................................................................ 13

............................................................... 17

....................................................................... 43

....................................................... 8

................................................ 15

....................................... 18

....................... 20

C. Settings and Adjustments

1. Default Dip Switch Settings .................................................................................... 45

a) "E" and "G" Control Board without Harvest Pump Timer Operation ................. 45

b) "G" Control Board with Harvest Pump Timer Operation ................................... 46

c) "G" Control Board S5 Dip Switch

2. Harvest Timer (S4 dip switch 1 & 2)

3. Pump-Out Timer (S4 dip switch 3 & 4) .................................................................. 47

4. Pump-Out Frequency Control (S4 dip switch 5 & 6) .............................................. 48

5. Bin Control Selector or Harvest Pump Timer Operation (S4 dip switch 7) ............. 48

a) Bin Control Selector: "E" Control Board ............................................................ 48

b) Harvest Pump Timer: "G" Control Board ........................................................... 49

6. Factory Use (S4 dip switch 8)

7. Freeze Timer (S4 dip switch 9 & 10)

8. Float Switch Selector (S5 dip switch 1): "G" Control Board ................................... 50

9. Rell Counter (S5 dip switch 2 through 5): "G" Control Board ............................... 50

D. Control Switch ............................................................................................................. 50

IV. Refrigeration Circuit and Component Service Information.............................................. 51

A. Refrigeration Circuit Service Information .................................................................... 51

B. Component Service Information .................................................................................. 54

C. Water Regulating Valve Adjustment (water-cooled models) ........................................ 55

V. Maintenance .................................................................................................................... 56

VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 57

VII. Disposal ......................................................................................................................... 59

VIII. Technical Information .................................................................................................... 60

A. Specication and Performance Data ........................................................................... 60

1. KM-1301SAH ......................................................................................................... 60

2. KM-1301SAH3 ....................................................................................................... 61

3. KM-1301SWH ....................................................................................................... 62

4. KM-1301SWH3 ..................................................................................................... 63

5. KM-1301SRH with URC-14F ................................................................................. 64

6. KM-1301SRH3 with URC-14F ............................................................................... 65

7. KM-1400SWH-M .................................................................................................... 66

8. KM-1400SWH3-M ................................................................................................. 67

9. KM-1601SAH ......................................................................................................... 68

10. KM-1601SAH3 ..................................................................................................... 69

11. KM-1601SWH ....................................................................................................... 70

12. KM-1601SWH3

13. KM-1601SRH with URC-21F Auxiliary Codes: R-0, R-1, and some S-1

14. KM-1601SRH with URC-21F Auxiliary Codes: some S-1 and S-2 and Later ...... 73

15. KM-1601SRH with URC-22F Auxiliary Codes: S-2 and Later ...............................74

16. KM-1601SRH3 with URC-21F Auxiliary Codes: R-0, R-1, and some S-1 ............ 75

17. KM-1601SRH3 with URC-21F Auxiliary Codes: some S-1 and S-2 and Later

18. KM-1601SRH3 with URC-22F Auxiliary Codes: S-2 and Later

19. KM-1900SAH ....................................................................................................... 78

20. KM-1900SAH3 ..................................................................................................... 79

21. KM-1900SWH ...................................................................................................... 80

22. KM-1900SWH3

............................................................................................ 45

..................................................................... 46

...................................................................... 46

................................................................................ 49

....................................................................... 49

.................................................................................................... 71

.............. 72

..... 76

............................ 77

.................................................................................................... 81

23. KM-1900SRH with URC-21F

24. KM-1900SRH with URC-22F ............................................................................... 83

25. KM-1900SRH3 with URC-21F ............................................................................. 84

26. KM-1900SRH3 with URC-22F ............................................................................. 85

27. KM-2100SWH3 .................................................................................................... 86

28. KM-2100SRH3 with URC-22F ............................................................................. 87

29. KM-2500SWH3 ................................................................................................... 88

30. KM-2500SRH3 with URC-23F ............................................................................. 89

31. KMH-2000SWH ................................................................................................... 90

32. KMH-2000SWH3 ................................................................................................. 91

33. KMH-2000SRH with URC-22F ............................................................................ 92

34. KMH-2000SRH3 with URC-22F .......................................................................... 93

B. Wiring Diagrams .......................................................................................................... 94

1. Diagrams without Harvest Pump Timer Relays ("E" and "G" Control Boards) ....... 94

a) KM-1601SWH, KM-1601SRH, KM-1900S_H, KMH-2000S_H .......................... 94

b) KM-1601SWH3, KM-1601SRH3, KM-1900S_H3, KM-2100S_H3,

KM-2500S_H3, KMH-2000S_H3 ...................................................................... 95

2. Diagrams with Harvest Pump Timer Relays ("G" Control Board) .......................... 96

a) KM-1301S_H Auxiliary Code T-0, U-0 ............................................................... 96

b) KM-1301S_H3 Auxiliary Code T-0, U-0 ............................................................. 97

c1) KM-1301S_H Auxiliary Code U-1 to D-0 and KM-1601SAH U-1 and Later ..... 98

c2) KM-1301SAH and KM-1301SWH Auxiliary Code D-1 and Later ..................... 99

c3) KM-1301SRH Auxiliary Code D-1 and Later ................................................. 100

d) KM-1301S_H3 Auxiliary Code U-1 and Later and KM-1601SAH3 ...................101

e) KM-1400SWH-M ............................................................................................. 102

f) KM-1400SWH3-M ............................................................................................ 103

............................................................................... 82

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.

Additional Warning for Remote Models

• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and ground connection to the remote condenser unit are supplied from the icemaker. Failure to properly ground the remote condenser unit could result in death or serious injury.

• Wire routing (conduit) and disconnect (if required) 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.

• Move the icemaker control switch to the "OFF" position and turn off the power

supply to the icemaker before servicing the remote condenser unit. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

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. KM Construction

1. Air-Cooled Models (SAH/3)

Evaporator Assembly

Cleaning Valve

Check Valve (water)

Water Pump

Inlet Water Valve

Spray Tubes

Low-Side Service Valve

High-Side Service Valve

Thermostatic Expansion Valves

Water Supply Inlet

Junction Box

Hot Gas Valve

Check Valves (refrigeration)

Condenser

Control Box

Fan Blade

Float Switch

Compressor

Thermostatic Bin Control

Z Bracket Used for Hoshizaki B-1300, B-1500, and Non-Hoshizaki Ice Storage Bins

Model Shown: KM-1301SAH3

Control Switch

Thermostatic Bin Control Brackets and Bulb Holder

Transformer Box (KM-1301SAH Auxiliary Code D-1 and Later and All 3 phase model)

Fan Motor

Drier

Liquid Line Valve

High-Pressure Switch

2. Water-Cooled Models (SWH/3/-M)

Evaporator Assembly

Cleaning Valve

Check Valve (water)

Water Pump

Float Switch

Inlet Water Valve

Compressor

Spray Tubes

Low-Side Service Valve

High-Side Service Valve

Thermostatic Expansion Valves

Water Supply Inlet

Junction Box

Hot Gas Valve

Check Valves (refrigeration)

Water-Cooled Condenser

Water Regulating Valve

Bin Control Thermostat

Z Bracket Used for Hoshizaki B-1300, B-1500, and Non-Hoshizaki Ice Storage Bins

Model Shown: KM-1301SWH3

Control Switch

Transformer Box (KM-1301SWH Auxiliary Code D-1 and Later and All 3 phase model)

Thermostatic Bin Control Brackets and Bulb Holder

Drier

Control Box

Liquid Line Valve

3. Remote Models (SRH/3)

Evaporator Assembly

Cleaning Valve

Check Valve (water)

Water Pump

Inlet Water Valve

Float Switch

Spray Tubes

Low-Side Service Valve

High-Side Service Valve

High-Side Liquid Service Valve

Water Supply Inlet

Hot Gas Valve

Junction Boxes

Check Valves (refrigeration)

Thermostatic Expansion Valves

Receiver

Control Box

Compressor

Bin Control Thermostat

Z Bracket Used for Hoshizaki B-1300, B-1500, and Non-Hoshizaki Ice Stoarage Bin

Note: KM-2500SRH3 Includes Headmaster (C.P.R.)

Model Shown: KM-1301SRH3

Control Switch

Transformer Box (KM-1301SRH Auxiliary Code D-1 and Later and All 3 phase model)

Thermostatic Bin Control Brackets and Bulb Holder

Access Valve

Drier

Liquid Line Valve

B. KMH Construction

1. Water-Cooled Models (SWH/3)

Spray Tubes

Evaporator Assembly

Cleaning Valve

Check Valve (water)

Water Pump

Float Switch

Low-Side Service Valve

Inlet Water Valve

High-Side Service Valve

Thermostatic Expansion Valves

Check Valves (refrigeration)

Transformer Box (3 phase model)

Control Box

Control Switch

Bin Control Thermostat

Model Shown: KMH-2000SWH3

Junction Box

Water Supply Inlet

Hot Gas Valve

Liquid Line Valve

Compressor

Thermostatic Bin Control Brackets and Bulb Holder

Z Bracket Used for Hoshizaki B-1300, B-1500, and Non-Hoshizaki Ice Stoarage Bin

High-Pressure Switch

Water Regulating Valve

Drier

Model Shown: KMH-2000SWH3

Water-Cooled Condenser

2. Remote Models (SRH/3)

Spray Tubes

Inlet Water Valve

Thermostatic Expansion Valves

Evaporator Assembly

Cleaning Valve

Check Valve (water)

Water Pump

Float Switch

Low-Side Service Valve

Model Shown: KMH-2000SRH3

Check Valves (refrigeration)

High-Side Service Valve

Transformer Box (3 phase model)

Control Box

Control Switch

Bin Control Thermostat

Thermostatic Bin Control Brackets and Bulb Holder

Z Bracket Used for Hoshizaki B-1300, B-1500, and Non-Hoshizaki Ice Stoarage Bin

High-Pressure Switch

Junction Box

Water Supply Inlet

Hot Gas Valve

Liquid Line Valve

Compressor

Drier

Model Shown: KMH-2000SRH3

Receiver

C. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (SAH/3)

Hot Gas

Val ve

High-Pressure

Switch

Check

Valves

Strainer

Drier

Suction Line

Fan

Condenser

Water Supply

Inlet Water Valve

Spray Tubes

Cleaning Valve

Liquid Line

Thermistor

Val ve

Heat Exchanger

Service

Val ve

Service

Val ve

Float Switch

Check Valve

Discharge Line

Compressor

Thermostatic Expansion Valves

Drain

Water Pump

Pump-Out

Spray Tubes

Evaporator

Water

Tank

Freeze/Harvest

Pump Timer

Refrigeration Circuit

Water Circuit

2. Water-Cooled Models (SWH/3/-M)

Check

Valves

Water Regulating Valve

Drain/Return

Condenser

Water Supply

High-Pressure

Switch

Hot Gas

Val ve

Strainer

Drier

Service

Val ve

Discharge Line

Suction Line

Liquid Line

Val ve

Service

Val ve

Compressor

Thermostatic Expansion Valves

Heat Exchanger

Thermistor

Cleaning Valve

Float Switch

Drain

Water Supply

Inlet Water Valve

Spray Tubes

Check Valve

Water Pump

Pump-Out

Evaporator

Freeze/Harvest

Pump Timer

Water

Tank

Refrigeration Circuit

Water Circuit

Spray Tubes

3a. Remote Models (SRH/3) Except KM-2500SRH3

Condenser Unit with Headmaster (CPR)

Check

Valves

Hot Gas

Service

Val ve

Fusible Plug

High Pressure

Switch

Val ve

Strainer

KM-2500SRH3: Headmaster

located in icemaker

Condenser

Water

Service

Val ve

Suction Line

Receiver

Drier

Headmaster

(C.P.R.)

Service

Liquid Line

Val ve

Fan

Thermistor

Cleaning Valve

Supply

Inlet Water Valve

Heat Exchanger

Val ve

Float Switch

Check Valve

Discharge Line

Compressor

Expansion Valves

Drain

Water Pump

Spray Tubes

Evaporator

Water

Tank

Pump-Out

Freeze/Harvest

Pump Timer

Refrigeration Circuit

Water Circuit

3b. Remote Models (SRH3) KM-2500SRH3

Condenser Unit without Headmaster (CPR)

Shut-Off Valve

(Factory Use Only)

High-Pressure

Switch

Strainer

Fusible Plug

Hot Gas

Val ve

Check

Valves

Condenser

Water

Supply

Fan

Spray Tubes

Receiver

Service Valve

Liquid Line

Evaporator

Val ve

Thermistor

Cleaning Valve

Drier

Headmaster

(C.P.R.)

Inlet Water Valve

Suction Line

Service Valve

Service

Val ve

Discharge Line

Compressor

Drain

Check Valve

Water

Tank

Expansion Valves

Float Switch

Pump-Out

Freeze

Water Pump

Refrigeration Circuit

Water Circuit

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. "E" and "G" Control Board without Harvest Pump Timer Operation

10th cycle

(S4 dip switch 5 & 6)

2 sec., then reverses

for 10/20 sec. (S4 dip

• Factory set for every

4. Pump-Out Cycle

• Pump motor stops for

switch 3 & 4)

FS in control

Comp continues

FMR continues

HGV energized

FS opens or

freeze timer

terminates

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

LLV de-energized

To 1. 1-Minute Fill Cycle

green "BC CLOSED" LED

(S4 dip switch 1 & 2)

FS closed

FS check

Thermistor temperature

FS closed

FS check

Comp continues

FMR continues

reaches 48°F (9°C)

Comp energized

FMR energized

WV energized

FM energized

LLV energized

(3.9kΩ or less). Harvest

timer starts (1 to 3 min.).

HGV energized

WV energized

FS open

PM energized

HGV de-energized

FS open

If FS is open, Comp stops and cycle returns to 1-min. ll.

WV de-energized

3. Ice Level Lowered

2. Icemaker Off

1. Bin Full

No ice touching BC bulb.

All components

Within 10 sec. after ice contacts BC bulb,

Icemaker starts at

"1. 1-Minute Fill Cycle."

de-energized.

icemaker shuts down.

BC closed

NOTE: "G" control board

on continuously when the K4 jumper is in place.

BC open

All components

de-energized

Ice contacts BC bulb

Legend:

BC–bin control

Comp–compressor

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH"

position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the

FM–fan motor

FMR–fan motor-remote

FS–oat switch

outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the

outside and the inside of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart

when the control switch is placed in the "ICE" position.

HGV–hot gas valve

LLV–liquid line valve

PM–pump motor

WV–inlet water valve

setting

5-min. timer in

3. Freeze Cycle

2. Harvest Cycle

1. 1-Minute

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer

• Max. WV time: 6 min.

• Max. harvest time: 20 min.

Fill Cycle

(S4 dip switch 9 & 10)

1 to 3-min. harvest

Thermistor

control

timer in control

in control

"E" and "G" Control Board without Harvest Pump Timer Operation Flow Chart

Cycle

Steps

Startup

Shutdown

and Restart

Operation

2. "G" Control Board with Harvest Pump Timer Operation

2 sec., then reverses

for 10/20 sec.

10th cycle

(S4 dip switch 5 & 6)

• Factory set for every

4. Pump-Out Cycle

• Pump motor stops for

(S4 dip switch 3 & 4)

FS in control

Comp continues

FMR continues

HGV energized

FS opens or

freeze timer

terminates

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

(FM continues on KM-1601SAH)

LLV de-energized

To 1. 1-Minute Fill Cycle

(S4 dip switch 9 & 10)

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer setting

3. Freeze Cycle

"G" Control Board with Harvest Pump Timer Operation Flow Chart

2. Harvest Cycle

1. 1-Minute

sec. (S4 dip switch 7), whichever is shorter. Do not

• WV time: 6 min. or the length of harvest minus 50

Fill Cycle

adjust S4 dip switch 7 out of the factory position.

• Max. harvest time: 20 min.

5-min. timer

in control

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

Harvest Pump

Timer

FS closed

50 sec.

PM energized

FS closed

FS check

Comp continues

FM continues

FMR continues

PM continues

LLV energized

HGV de-energized

3. Ice Level Lowered

No ice touching BC bulb.

Icemaker starts at

"1. 1-Minute Fill Cycle."

FS check

WV de-energized

Thermistor temperature

Comp energized

FMR energized

WV energized

FS open

reaches 48°F (9°C)

(3.9 kΩ or less).

Harvest timer starts.

HGV energized

WV energized

FS open

2. Icemaker Off

All components

de-energized.

1. Bin Full

Within 10 sec. after ice contacts BC bulb,

If FS is open, Comp stops and cycle returns to 1-Min. ll.

icemaker shuts down.

Green "BC CLOSED" LED on continuously

BC closed

NOTE:

when the K4 jumper is in place.

BC open

All components

de-energized

Legend:

BC–bin control

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position,

power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of the

evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the outside and the inside

of the evaporator plate assembly.

Comp–compressor

FM–fan motor

FMR–fan motor-remote

FS–oat switch

HGV–hot gas valve

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control

switch is placed in the "ICE" position.

LLV–liquid line valve

PM–pump motor

WV–inlet water valve

Ice contacts BC bulb

Cycle

Steps

Startup

Shutdown

and Restart

Operation

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service

personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Control switch in "OFF" position does not de-energize all

loads Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• Before servicing the appliance, move the control switch to the "OFF" position and

turn off the power supply.

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

• Make sure all food zones in the appliance and dispenser unit/ice storage bin are

clean after service.

The diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, proper voltage per nameplate, and adequate water supply. Check CB using the steps in "II.C. Control Board Check." Check dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and S5 dip switch 1 through 5 ("G" CB) are in the factory default position. S4 dip switch 1, 2,

5, 6 are cleaning adjustments and the settings are exible. For factory default settings,

see "III.C.1. Default Dip Switch Settings."

Note: • When checking high voltage (115VAC), always choose a white (W) neutral wire to

establish a good neutral connection.

• On models with a main transformer, the neutral (W) is provided through MT.

To conrm a good neutral, check for 60VAC from white (W) neutral to ground (GND). If 60VAC is present, neutral is good. If 60VAC is not present, check 208-230VAC main power supply to MT. If 208-230VAC is present, check MT continuity.

• When checking voltage from the CB K1 connector (10 pin connector), pull CB

K1connector out slightly to allow room for multimeter test leads contact.

1) Turn off the power supply, then access the control box. Move the control switch to the "OFF" position. Clear any ice from BC.

2) Check that BC is closed and the 115VAC 10A fuse is good.

1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis

3) Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5-sec. delay occurs.

• "E" Control Board: CB red "POWER OK" LED turns on.

• "G" Control Board: CB red "POWER OK" LED and green "BC CLOSED" LEDturn on.

Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is

interrupted (K2 connector).

• Check CB using the steps in "II.C. Control Board Check."

• "G" CB: If yellow "BC OPEN" LED is on, check that CB red K4jumper is in place.

a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm closed BC and

10A fuse is good. If BC is open, remove ice from bulb and warm bulb in hand. IfBC does not close, replace BC. See "II.D. Bin Control Check." Check for 115VAC at control switch #1(BR) to neutral (W) then at control switch #2(P) to neutral (W). If115VAC is present on control switch #1 (BR) and not on control switch #2(P), replace control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at HPS (P) to neutral (W), then HPS (BK) to neutral (W). If115VAC is present at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If115VAC is present at HPS (BK), check for 10.5VAC at CB K2#1 (R) to CB K2#2(R). If10.5VAC is not present, conrm that the cleaning valve interlock switch is closed. Next, check CT continuity. Ifopen, replace CT.

b) HPS Diagnosis: Conrm FM is energized and fan blade turns freely. Conrm

condenser coil is not dirty. Conrm that the location meets installation requirements. See the appliance's instruction manual for details. Conrm there are no restrictions in the refrigeration circuit. Harvest Cycle: HGV, strainer, or check valve. Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged line set or tting, and fan blade for binding. Let refrigeration circuit pressures equalize. If HPS does not reset and pressures are equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.

4) 1-Minute Fill Cycle – LED 4 is on.

FS. If FS is closed, harvest cycle begins. If harvest cycle begins (Comp, HGV, and FMR energize), continue to step 5. If FS is open, WV remains energized through additional 1-min. ll cycles until water enters the water tank and FS closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: Check that water enters the water tank. If not, check that the water supply line shut-off valve is open and screens or external lters are clear. Check for 115VAC at CB K1 #6(O) to neutral(W). If 115VAC is not present, replace CB. If 115VAC is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present, check coil continuity. Ifopen, replace WV. If the water tank lls, but the appliance fails to start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace CB.

WV energizes. After 1 min., CB checks for a closed

5) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV continues. Comp, FMR, and HGV energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180sec. Thepump-out timer (S4dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5 & 6). WV remains energized during harvest for a maximum of 6min. or the length of harvest, whichever is shorter.

a) Comp Diagnosis: Check that evaporator is warming. Ifnot, conrm that Comp

energizes. If not, check for 115VAC at CB K1 #1 or #9 (V) to neutral (W). If 115VAC is not present, check for 115VAC at CB K1 #7 or #10 (BR) to neutral (W). If115VAC is present at CB #7 or #10 (BR) and not at CB #1 or #9 (V), replace CB. If 115VAC is present, check for 115VAC at MC solenoid. If 115VAC is present, conrm contacts are closed. If not, replace MC. If MC contacts are closed, check Comp start and run capacitors, Comp start relay, and Comp motor winding.

b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W). If115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at HGV coil and check HGV coil continuity. Replace as needed.

c) LLV Diagnosis: Conrm that LLV is de-energized and closed (not bypassing).

Ifenergized, replace CB. If de-energized and bypassing, replace LLV.

d) WRV Diagnosis: Conrm WRV is not leaking by.

e) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F

(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). Check discharge line temperature. For a thermistor check, see "II.F.Thermistor Check." If 1-min. ll cycle starts after harvest timer terminates, check that FS is clean and operating properly. See "II.E. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle. Ifnot, replace CB.

Note: The min. total time allowed by CB for a complete harvest cycle is 2 min.

Max. harvest time allowed is 20 min.

NOTICE! On models with "G" control board and no harvest pump timer relays, S4dip switch 7 must remain off. Otherwise, PM energizes in reverse direction the last 50 seconds of harvest and empties water from water tank.

6) Freeze Cycle – LED 1 is on. Comp and FMR continue. PM, FM, and LLVenergize. WV and HGV de-energize. Appliance is held in freeze by a 5-min. short cycle protection timer. After 5-min. timer terminates and FSopens, freeze cycle terminates.

a) Freeze Cycle Diagnosis: Conrm Comp and FMR continue. Conrm that PM, FM,

and LLV energize. Conrm WRV opens. Next, conrm WV and HGV de-energize. During the rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV and FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specication and Performance Data."

b) Comp and FMR Diagnosis: If Comp and FMR de-energize once freeze begins,

check that appliance has not shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS Diagnosis" above. If "POWER OK" LED is on, check for 115VAC at CB K1#1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB. If 115VAC is present, check for 115VAC at CR or MC coil. If 115VAC is present, check CR or MC coil and contact continuity. Replace as needed. If CR or MC is ok, check Comp external overload, start relay, and start and run capacitors. Next, check Comp motor winding continuity. If Comp is energized but evaporator is not cooling, check for an inefficient Comp. See "VIII.A. Specication and Performance Data." If Comp is energized but FMR is not, check for 115VAC at the FMR junction box. If115VAC is not present, check icemaker wiring connections. If 115VAC is present, check for voltage at condenser unit. If115VAC is not present, check eld wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and fan blade for binding.

c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to

neutral (W). If 115VAC is present after PM energizes, replace CB. If 115VAC is not present, replace WV (bypassing). If HGV did not de-energize, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present after PM energizes, replace CB. If115VAC is not present, replace HGV (bypassing).

d) PM Diagnosis: Conrm water is owing over evaporator from PM and not WV. If PM

de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized, check for 115VAC at control switch #5 (R) to neutral (W). If 115VAC is present at CB K1 #4 (R) and not at control switch #5 (R), check control switch continuity between #5 (R) and #4 (R). Replace as needed. If 115VAC is present at control switch #5(R) to neutral (W), check PM impeller for binding, PM capacitor, and motor winding continuity.

e) FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB

K1#3 (BK) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present: For FM: check capacitor, motor winding, and blade for binding. For LLV: check coil voltage and continuity.

f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,

check refrigerant pressures. See "VIII.A. Specication and Performance Data." Next, check HM operation. If refrigeration pressures are above HM setpoint and HMis bypassing, replace HM. Check TXV for proper operation. Remove TXV bulb and hold it in your hand, refrigerant low-side pressure should rise, place TXV bulb in ice water, refrigerant low-side pressure should drop. A 10 to 15 pound pressure swing between warm and cold conditions indicate a good TXV. If a 10 to 15pound swing is not present, replace TXV.

g) WRV Diagnosis: WRV is factory set and generally no adjustment is required.

IfWRV fails to open in freeze, check for proper refrigerant pressures. See "VIII.A. Specication and Performance Data." If refrigerant pressures are correct and WRV does not open, adjust or replace as needed. See "IV.C. Water Regulating Valve Adjustment (water-cooled models)."

h) Freeze Termination Diagnosis:

After 5 min. in freeze, disconnect CB K5 FS connector. 15 sec. later appliance should switch out of the freeze cycle (15 second delay after FS opens before terminating the freeze cycle). If appliance remains in freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with FS removed but would previously not switch out of freeze with FS connected (long freeze - 3 beep alarm), see "II.E. Float Switch Check and Cleaning."

Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.

Cycle times and pressures should follow performance data provided in this manual. See "VIII.A. Specication and Performance Data."

i) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.

ll and harvest cycles. If not, check water supply lters, shut-off valve, WV screen. Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check

that CV is not leaking by (water owing down the potable drain). If CV is leaking by,

remove and clean CV, replace rubber seat and spring if necessary. If water tank is full, see "II.E. Float Switch Check and Cleaning" for erratic operating FS.

7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the rst pump-out is dependent on CB. "E" CB rst pump-out is after the rst freeze cycle. "G" CB rst pump-out is determined by S4 dip switch 5 & 6. See the table below.

"E" & "G" Control Board Settings 1st Pump-Out

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 1st freeze cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

Pump-Out Frequency

"E" Control Board "G" Control Board

Comp and FMR continue, HGV energizes. If S4dip switch 3 & 4 are set to 3 off and 4on, LED 4 turns on and WV energizes. FM and LLVde-energize. PM stops for 2 sec., then reverses for 10/20 sec. depending on pump-out timer (S4 dip switch 3 & 4) setting. When the pump-out timer terminates, pump-out is complete. The pump-out frequency control (S4 dip switch 5 & 6) is factory set, and generally no adjustment is required. However, the pump-out frequency control can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For details, see "III.C.4. Pump-Out Frequency Control (S4 dip switch 5 & 6)."

Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), disconnect CB black K5 connector (FS connector) after 5 min. of freeze. Check that PM

stops and re-starts and water is owing down the drain through CV. If PM does not stop

and re-start, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. IfLEDs1,3, and 2 are on and PM does not energize, check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, make sure the drain line is not clogged and that CV is clean and operating properly.

Conrm FM and LLV de-energize. If FM or LLV is energized with LEDs 1, 3, and 2 on, replace CB.

8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5 above. Note: Appliance continues to cycle until BC is satised or power is turned off. The

appliance always restarts at the 1-min. ll cycle.

9) Shutdown: "E" and "G" Control Board

position. This dip switch must be left in the factory default position or the appliance will not operate correctly. "G" Control Board: CB red K4connector must have the jumper in place. When the

jumper is in place, the green "BC CLOSED" LED remains on. If the jumper is not in place, yellow "BC OPEN" LED turns on and the icemaker turns off and remains off until the jumper is replaced in its original position.

Legend: BC–bin control; CB–control board; CR–compressor relay; CT–control transformer;

Comp–compressor; CV–check valve; FM–fan motor; FMR–fan motor-remote; FS– oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure switch; LLV–liquid line valve; MC–magnetic contactor; MT–main transformer;

PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water valve

Donot adjust S4 dip switch 7 out of the factory default

2. "G" Control Board with Harvest Pump Timer Diagnosis

3) Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn on. If yellow "BC OPEN" LED is on, check CB K4 jumper.

Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is

interrupted (K2 connector).

• Check CB using the steps in "II.C. Control Board Check."

• Conrm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,

conrm CB K4 jumper is in place. Otherwise, CB yellow "BC OPEN" LED is on and appliance will not start.

a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm 10A fuse is good.

Check for 115VAC at control switch #1 (BR) to neutral (W) then at control switch #2(P) to neutral (W). If 115VAC is present on #1 (BR) and not on #2(P), replace control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at HPS (P) to neutral (W) then HPS (BK) to neutral (W). If115VAC is present at HPS (P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If 115VAC is present at HPS (BK), check for 10.5VAC at CB K2#1 red wire to CB K2 #2 red wire. If 10.5VAC is not present, check that the cleaning valve interlock switch is closed. Next, check CT continuity. If open, replace CT.

b) HPS Diagnosis: Conrm FM is energized and fan blade turns freely. Conrm

4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGV, FMR energized), continue to step 5a. If FS is open, WV remains energized through additional 1-min. ll cycles until water enters the water tank and FS closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: Check that water enters the water tank. If not, check that the water supply line shut-off valve is open and screens or external lters are clear. Check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present, check coil continuity. Ifopen, replace WV. If the water tank lls, but the appliance fails to start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace CB.

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,

FMR, HGV, and X10 relay energize. CBmonitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 sec. The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5 & 6). WV and X11 relay are energized during harvest for a maximum of 6 min. or the length of harvest minus 50sec., whichever is shorter. 50sec. before harvest terminates, PM energizes. See step 5b below.

a) Comp Diagnosis: Check that evaporator is warming. Ifnot, conrm that Comp

energizes. If not, check for 115VAC at CB K1 #1 or #9 (V) to neutral (W). If 115VAC is not present, check for 115VAC at CB K1 #7 or #10 (BR) to neutral (W). If115VAC is present at #7 or #10 (BR) and not at #1 or #9 (V), replace CB. If 115VAC is present, check for 115VAC at CR or MC solenoid. If 115VAC is present, conrm contacts are closed. If not, replace CR or MC. If CR or MC contacts are closed, check Comp external overload, Comp start and run capacitors, Comp start relay, and Comp motor winding. If Comp is energized and evaporator is not warming, check that HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to a neutral(W). If 115VAC is not present and LED 2 is on, replace CB. If115VAC is present, check coil voltage and continuity. Replace as needed. Conrm that LLV is de-energized and closed (not bypassing). If energized, replace CB. Ifde-energized and bypassing, replace LLV. Conrm WRV is not leaking by. If evaporator is warming, PM energizes for the last 50sec. of harvest.

b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

c) LLV Diagnosis: Conrm that LLV is de-energized and closed (not bypassing).

Ifenergized, replace CB. If de-energized and bypassing, replace LLV.

d) WRV Diagnosis: Conrm WRV is not leaking by.

5b) Harvest Pump Timer – LEDs 1, 3, and 2 are on. When the thermistor reaches 48°F

(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). 50 sec. before the harvest timer terminates, LED 3turns on and PM energizes. Comp, FMR, HGV, and X10 relay continue. LED 4 turns off, WV and X11 relay de-energize. Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it warmed to 48°F (9°C) or warmer? Conrm thermistor status. See "II.F. Thermistor Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does not energize 50 sec. before harvest terminates, replace CB. If WV continues, check for 115VAC at CB K1 #6 (O). If115VAC is present, and LED 4 is off, replace CB. If LED 3is on and PM is not energized, check for 115VAC at CB K1 #5(DBU). If115VAC is not present, replace CB. If 115VAC is present and PM is not energized, check for 115VAC at X10relay terminal #7 (Y) to neutral (W). If 115VAC is not present, check for 115VAC at X10 relay terminal #3 (P) to neutral (W) and X10 relay terminal #5 (Y) to neutral (W).

If 115VAC is present on terminal #3(P) and not on terminal #5 (Y), replace X10 relay. If 115VAC is present on X10 relay terminal #7 (Y) and PM is not energized, check for 115VAC at X10 relay terminal #4 (R) to neutral (W) and terminal #6 (DBU) to neutral (W). If 115VAC is present on terminal #6(DBU) and not on terminal #4 (R), replace X10 relay. If 115VAC is present on X10relay terminal #4 (R), check control switch contact continuity between terminals #4(R) and #5(R). Ifcontacts are open, replace control switch. If contacts are closed and 115VAC is present between control switch terminal #5 (R) and neutral (W), check PM capacitor and motor winding continuity.

5c) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F

(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). Check discharge line temperature. For a thermistor check, see "II.F.Thermistor Check." If 1-min. ll cycle starts after harvest timer terminates, check that FS is clean and operating properly, see "II.E. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle. Ifnot, replace CB. Note: The minimum total time allowed by CB for a complete harvest cycle is 2 min.

Maximum harvest time allowed is 20 min.

NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during the last 50 sec. of harvest.

6) Freeze Cycle – LED 1 is on. Comp, FMR, and PM continue. FM and LLV energize. HGV and X10 relay de-energize. Appliance is held in freeze by a 5-min. short cycle protection timer. After 5-min. timer terminates and FS opens, freeze cycle terminates. Note: PM power supply switches from CBK1 #5(DBU) in harvest to K1 #4 (R) in freeze.

a) Freeze Cycle Diagnosis: Conrm Comp, FMR, and PM continue. Conrm that

FM and LLV energize. Conrm WRV opens. Next, conrm HGV and X10 relay de-energize. During the rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV and FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specication and Performance Data."

b) Comp and FMR Diagnosis: If Comp and FMR de-energize once freeze begins,

check that appliance has not shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS Diagnosis" above. If "POWER OK" LED is on, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB. If 115VAC is present, check for 115VAC at CR or MC coil. If 115VAC is present, check CR or MC coil and contact continuity. Replace as needed. If CR or MC is okay, check Comp start relay and start and run capacitors. Next, check Comp motor winding continuity. If Comp is energized but evaporator is not cooling, check for an inefficient Comp. See "VIII.A. Specication and Performance Data." If Comp is energized but FMR is not, check for 115VAC at the FMR junction box. If 115VAC is not present, check icemaker wiring connections. If 115VAC is present, check for voltage at condenser unit. If115VAC is not present, check eld wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and fan blade for binding.

c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to

neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB. If 115VAC is not present, replace WV (bypassing). If HGV did not de-energize at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present 50 sec. after PM energizes, replace CB. If 115VAC is not present, replace HGV (bypassing).

d) PM Diagnosis: Conrm water is owing over evaporator from PM and not WV. If PM

de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized, check for 115VAC at control switch #5 (R) to neutral (W). If 115VAC is present at CB K1 #4 (R) and not at control switch #5 (R), check control switch continuity between #5 (R) and #4 (R). Replace as needed. If 115VAC is present at control switch #5 (R) to neutral (W), check PM capacitor and motor winding continuity.

e) FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB

K1#3 (BK) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present: For FM, check capacitor, motor winding, and blade for binding. For LLV, check coil voltage and continuity.

f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,

g) WRV Diagnosis: WRV is factory set and generally no adjustment is required.

h) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS

connector. 15 sec. later appliance should switch out of the freeze cycle (15 second delay after FS opens before terminating the freeze cycle). If appliance remains in freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with FS removed but would previously not switch out of freeze with FS connected (long freeze - 3 beep alarm), see "II.E. Float Switch Check and Cleaning."

Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.

Cycle times and pressures should follow performance data provided in this manual. See "VIII.A. Specication and Performance Data."

i) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.

ll and harvest cycles. If not, check water supply lters, shut-off valve, WV screen. Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check

that CV is not leaking by (water owing down the potable drain). If CV is leaking by,

remove and clean CV, replace rubber seat and spring if necessary. If water tank is full, see "II.E. Float Switch Check and Cleaning." for erratic FS.

7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the rst pump-out is determined by S4 dip switch 5& 6. See the table below.

"G" Control Board Settings

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

Pump-Out Frequency

1st Pump-Out

"G" Control Board

Comp and FMR continue, HGV energizes. If S4dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV and X11 relay energize, energizing X10relay.

NOTICE!S4dip switch 3 & 4 must not be set to 3 off and 4 on. Otherwise, PM will rotate in freeze cycle direction instead of pump-out direction. FM and LLV

de-energize. PM stops for 2 sec., then reverses for 10/20 sec. depending on pump-out timer (S4dip switch 3 & 4) setting. When the pump-out timer terminates, pump-out is complete. The pump-out frequency control (S4 dip switch 5 & 6) is factory set, and generally no adjustment is required. However, the pump-out frequency control can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For details, see "III.C.4. Pump-Out Frequency Control (S4 dip switch 5 & 6)."

Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after 5min. of freeze disconnect CB black K5 connector (FS connector). Check that PM

stops and re-starts and that PM rotation is correct (water owing down the drain through

CV). If PM does not stop and re-start, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. IfLEDs1,3, and 2 are on and PM does not energize, check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, check that X10 relay is de-energized. If not, check X11 relay status. If X11 relay is energized, replace CB. If X11 relay is de-energized and X10 relay is energized, replace X11 relay (contacts sticking). If X10 relay is de-energized, check for 115VAC at terminal #6 (DBU) to neutral (W) and terminal #2 (DBU) to neutral (W). If 115VAC is present on terminal #6 (DBU) and not on terminal #2 (DBU), replace X10 relay. If PM is energized and rotating in pump-out rotation, make sure the drain line is not clogged and that CV is clean and operating properly.

Conrm FM and LLV de-energize. If FM or LLV are energized with LEDs 1, 3, and 2 on, replace CB.

8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5a) above. Note: Appliance continues to cycle until MBC is satised or power is switched off. The

appliance always restarts at the 1-min. ll cycle.

9) Shutdown: "G" Control Board

When the appliance is running, hold ice in contact with the thermostatic bulb. BC switch opens within 10 sec., shutting down the appliance. BC is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations. CB red K4connector must have the jumper in place. When the jumper is in place, the green "BC CLOSED" LED remains on. If the jumper is not in place, yellow "BC OPEN" LED turns on and the icemaker turns off and remains off until the jumper is replaced in its original position. Diagnosis: See "II.D. Bin Control Check."

Legend: BC–bin control; CB–control board; Comp–compressor; CR–compressor relay;

CT–control transformer; CV–check valve; FM–fan motor; FMR–fan motor remote; FS–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure switch; LLV–liquid line valve; MC–magnetic contactor; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet water

valve

+ 73 hidden pages

Hoshizaki KM-1301SAH-3, SRH-3 KM-1900SAH-3, SRH-3 KM-1400SWH-M, SRH3 KMH-2000SWH-3, SRH-3 KM-2100SWH3 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Safety Information

I. Construction and Water/Refrigeration Circuit Diagram

A. KM Construction

1. Air-Cooled Models (SAH/3)

2. Water-Cooled Models (SWH/3/-M)

3. Remote Models (SRH/3)

B. KMH Construction

1. Water-Cooled Models (SWH/3)

2. Remote Models (SRH/3)

C. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (SAH/3)

2. Water-Cooled Models (SWH/3/-M)

3a. Remote Models (SRH/3) Except KM-2500SRH3

3b. Remote Models (SRH3) KM-2500SRH3

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. "E" and "G" Control Board without Harvest Pump Timer Operation

2. "G" Control Board with Harvest Pump Timer Operation

B. Service Diagnosis

1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis

2. "G" Control Board with Harvest Pump Timer Diagnosis