Hoshizaki KM-320MAH-E User manual

Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Models

KM-320MAH-E

KM-515MAH-E

KM-650MAH-E

Modular Crescent Cuber

Hoshizaki America, Inc.

SERVICE MANUAL

Number: 73170

Issued: 11-13-2008

Revised: 3-22-2012

89/336

73/23

2

WARNING

Only qualied service technicians should install and service the icemaker. To

obtain the name and phone number of your local Hoshizaki Certied Service

Representative, visit www.hoshizaki-europe.com. No service should be undertaken

until the technician has thoroughly read this Service Manual. Failure to service and

maintain the icemaker 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 and maintenance of the icemaker. Should the reader have any questions or

concerns which have not been satisfactorily addressed, please call the appropriate

Hoshizaki Service Office:

UK/Ireland - Hoshizaki UK

TEL : +44 (0)845 456 0585

FAX: +44 (0)132 283 8331

Holland - Hoshizaki Europe

TEL : +31 (0)20 6918499

FAX: +31 (0)20 6918768

Belgium/Luxemburg - Hoshizaki Belgium

TEL : +32 (0)2 7123030

FAX: +32 (0)2 7123031

Germany/Switzerland/Austria - Hoshizaki Deutschland

TEL : +49 (0)2154 92810

FAX: +49 (0)2154 928128

France - Hoshizaki France

TEL : +33 (0)1 48639380

FAX: +33 (0)1 48639388

Other countries - Hoshizaki Europe

TEL: +31 (0)20 6918499

FAX: +31 (0)20 6918768

Web Site: www.hoshizaki-europe.com

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

following information:

   •ModelNumber________________________

   •SerialNumber________________________

   •Completeanddetailedexplanationoftheproblem.

3

CONTENTS

Important Safety Information ................................................................................................. 5

I. Specications ...................................................................................................................... 7

A. KM-320MAH-E ............................................................................................................. 7

B. KM-515MAH-E .............................................................................................................. 8

C. KM-650MAH-E .............................................................................................................. 9

II. General Information ......................................................................................................... 10

A. Construction ................................................................................................................ 10

1. KM-320MAH-E ....................................................................................................... 10

2. KM-515MAH-E .......................................................................................................11

3. KM-650MAH-E ...................................................................................................... 12

B. Sequence of Operation ............................................................................................... 13

1. Sequence Cycles and Shutdown ........................................................................... 13

a) "E" Control Board ............................................................................................. 13

b) "G" Control Board ............................................................................................ 15

2. Sequence Flow Chart ............................................................................................ 17

a) "E" Control Board: ............................................................................................ 17

b) "G" Control Board: ............................................................................................ 18

C. Control Board .............................................................................................................. 19

1. Control Board Layout ............................................................................................. 20

a) "E" Control Board ............................................................................................ 20

b) "G" Control Board ........................................................................................... 21

2. LED Lights and Audible Alarm Safeties ................................................................. 22

a) "E" Control Board ............................................................................................ 22

b) "G" Control Board ........................................................................................... 23

3. Controls and Adjustments ...................................................................................... 24

a) Default Dip Switch Settings ............................................................................... 24

b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 25

c) Pump-Out Timer (S4 dip switch 3 & 4) .............................................................. 25

d) Pump-Out Frequency Control (S4 dip switch 5 & 6) ......................................... 26

e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7) ............................. 26

f) Factory Use (S4 dip switch 8) ............................................................................ 27

g) Freeze Timer (S4 dip switch 9 & 10) ................................................................. 27

h) Float Switch Selector (S5 dip switch 1): "G" Control Board .............................. 28

i) Rell Counter (S5 dip switch 2 through 5): "G" Control Board ........................... 28

D. Control Switch ............................................................................................................. 28

IMPORTANT

This manual should be read carefully before the icemaker is serviced. Read

the warnings and guidelines contained in this booklet carefully as they provide

essential information for the continued safe use, service, and maintenance of the

icemaker. Retain this booklet for any further reference that may be necessary.

4

III. Technical Information ...................................................................................................... 29

A. Water Circuit and Refrigeration Circuit ........................................................................ 29

B. Wiring Diagram ............................................................................................................ 30

1. Thermostatic Bin Control ....................................................................................... 30

2. Mechanical Bin Control ......................................................................................... 31

C. Performance Data ....................................................................................................... 32

1. KM-320MAH-E ....................................................................................................... 32

2. KM-515MAH-E ...................................................................................................... 33

3. KM-650MAH-E ...................................................................................................... 34

IV. Service Diagnosis ........................................................................................................... 35

A. Diagnostic Procedure .................................................................................................. 35

B. Control Board Check ................................................................................................... 39

C. Bin Control Check ....................................................................................................... 40

1. Thermostatic Bin Control Check ............................................................................ 40

2. Mechanical Bin Control Check and Cleaning ....................................................... 41

a) Mechanical Bin Control Check .......................................................................... 41

b) Mechanical Bin Control Cleaning ...................................................................... 42

D. Float Switch Check and Cleaning ............................................................................... 43

1. Float Switch Check ................................................................................................ 43

2. Float Switch Cleaning ............................................................................................ 44

E. Thermistor Check ........................................................................................................ 45

F. Diagnostic Charts ........................................................................................................ 46

1. No Ice Production ................................................................................................... 46

2. Freeze-Up .............................................................................................................. 47

3. Low Ice Production ................................................................................................ 49

V. Replacement of Components .......................................................................................... 50

A. Service for Refrigerant Lines ....................................................................................... 50

1. Refrigerant Recovery ............................................................................................. 50

2. Brazing .................................................................................................................. 51

3. Evacuation and Recharge (R-404A) ...................................................................... 52

B. Important Notes for Component Replacement ............................................................ 53

VI. Cleaning and Maintenance ............................................................................................ 54

A. Cleaning and Sanitizing Instructions ........................................................................... 54

1. Cleaning Procedure ................................................................................................ 55

2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 56

B. Maintenance ................................................................................................................ 57

C. Preparing the Icemaker for Periods of Non-Use .......................................................... 58

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

5

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could

result in death, serious injury, damage to the icemaker, 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

icemaker or property.

IMPORTANT Indicates important information about the use and care of the

icemaker.

WARNING

This icemaker 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

icemaker 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icemaker.

•Electricalconnection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 severe damage to equipment.

•This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 fuses, damage to existing

wiring, or component failure. This could lead to heat generation or re.

• THE ICEMAKER MUST BE EARTHED (GROUNDED). 220-240VAC UK and the

Republic of Ireland: This appliance is equipped with a non-rewirable BSI BS-1363

three-prong 13A fused earthing (grounding) plug

to reduce the risk of potential

shock hazards. It must be plugged into a properly earthed (grounded), independent

3-prong mains socket. If the mains socket is not compatible, it is your personal

responsibility to have a qualied electrician replace it with a properly earthed

(grounded), independent, compatible 3-prong mains socket. Do not remove the

earth (ground) prong or fuse from the plug and do not use an adapter plug. The

BSI BS-1363 three-prong 13A fused earthing (grounding) plug must never be used

without a fuse cover being tted. Failure to follow these instructions may result in

death, electric shock, or re.

• 220-240VAC Continental: If the power cord and/or non-rewirable plug should need

to be tted or replaced, it should only be done by a qualied service technician.

Failure to follow these instructions may result in death, electric shock, or re.

•Toreducetheriskofelectricshock,donottouchthecontrolswitchorplugwith

damp hands.

6

WARNING, continued

•Beforeservicingtheicemaker,movethecontrolswitchtothe"OFF"position.

Unplug the icemaker from the mains socket.

•Donotuseanextensioncord.

•Donotuseanicemakerwithadamagedpowercord.Thepowercordshouldnotbe

altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could

result in electric shock or re. To unplug the icemaker, be sure to pull the plug, not

the cord, and do not jerk the cord.

•TheGREEN/YELLOWearth(ground)wireinthefactory-installedpowercordis

connected to the icemaker. If it becomes necessary to remove or replace the

power cord, be sure to connect the power cord's earth (ground) wire.

•Donotmakeanyalterationstotheicemaker.Alterationscouldresultinelectric

shock, injury, re, or damage to the icemaker.

•This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thisappliance.

•Donotclimb,stand,orhangontheicemakerorallowchildrenoranimalstodoso.

Serious injury could occur or the icemaker could be damaged.

•Donotusecombustiblesprayorplacevolatileorammablesubstancesnearthe

icemaker. They might catch re.

•Keeptheareaaroundtheicemakerclean.Dirt,dust,orinsectsintheicemaker

could cause harm to individuals or damage to the icemaker.

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icemaker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icemakeronduringextendedperiodsofnon-use,extended

absences, or in sub-freezing temperatures. To properly prepare the icemaker for

these occasions, follow the instructions in "VI.C. Preparing the Icemaker for Periods

of Non-Use."

•Donotplaceobjectsontopoftheicemaker.

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

7

I. Specications

A. KM-320MAH-E

Note: We reserve the right to make changes in specications and design without prior

notice.

AC SUPPLY VOLTAGE 220-240/50/1

AMPERAGE 3.5 A (5 Min. Freeze at 109°F/WT 59°F)

MINIMUM CIRCUIT AMPACITY 15 A

MAXIMUM FUSE SIZE 15 A

APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)

PER 24 HR. Temp. (°F) 50 70 90

lbs./day (kg/day) 70 *293 (133) 275 (125) 255 (116)

Reference without *marks 80 279 (127) 252 (114) 234 (106)

90 275 (125) *232 (105) 213 (97)

100 273 (124) 228 (103) 196 (89)

FOR THE EUROPEAN MARKET 10/10°C 20/15°C 30/25°C

ICE CAPACITY lbs./day (kg/day) 346 (157) 303 (137) 236 (107)

SHAPE OF ICE Crescent Cube

ICE PRODUCTION PER CYCLE 8 lbs. (3.6 kg) 360pcs.

APPROXIMATE STORAGE CAPACITY N/A

ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F

ELECTRIC W (kWH/100 lbs.) 710 (7.3) 650(5.3)

WATER gal./24HR (gal./100 lbs.) 52(22.2) 117(40.1)

EXTERIOR DIMENSIONS (WxDxH) 22"x27-3/8"x30-5/16" (560x695x770 mm)

EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)

WEIGHT Net 153 lbs. (69 kg), Shipping 175 lbs. (79 kg)

CONNECTIONS - ELECTRIC Power Cord - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

3/8" OD Hard Tube

CUBE CONTROL SYSTEM Float Switch

HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer

ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe

COOLING WATER CONTROL N/A

BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control

COMPRESSOR Hermetic, Model ASE32C3E-CAZ-254

CONDENSER Air-Cooled , Fin and tube type

EVAPORATOR Vertical type, Stainless Steel and Copper

REFRIGERANT CONTROL Thermostatic Expansion Valve

REFRIGERANT CHARGE R404A, 1 lb. 4.3 oz. (575g)

DESIGN PRESSURE High 467PSIG, Low 230PSIG

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 Float Switch

ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Storage Bin

OPERATING CONDITIONS VOLTAGE RANGE 198 - 254 V

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

ENG.F-011.1.0205

8

B. KM-515MAH-E

Note: We reserve the right to make changes in specications and design without prior

notice.

AC SUPPLY VOLTAGE 220-240/50/1

AMPERAGE 7.14 A ( 5 Min. Freeze AT 109°F / WT 59°F)

MINIMUM CIRCUIT AMPACITY 15A

MAXIMUM FUSE SIZE 15 A

APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)

PER 24 HR. Temp.(°F) 50 70 90

lbs./day ( kg/day ) 70 *513 (233) 482 (219) 441 (200)

Reference without *marks 80 490 (222) 442 (200) 401 (182)

90 482 (219) *408 (185) 366 (166)

100 474 (215) 398 (181) 328 (149)

FOR THE EUROPEAN MARKET 10/10°C 21/15°C 30/25°C

ICE CAPACITY lbs./day ( kg/day ) 582 (264) 528 (239) 406 (184)

SHAPE OF ICE Crescent Cube

ICE PRODUCTION PER CYCLE 10.2 lbs. (4.6 kg) 480pcs.

APPROXIMATE STORAGE CAPACITY N/A

ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F

ELECTRIC W (kWH/100 lbs.) 1200(7.1) 1080(5.1)

WATER gal./24HR (gal./100 lbs.) 108(26.5) 159(31.1)

EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 30-5/16" (560 x 695 x 770 mm)

EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)

WEIGHT Net 151 lbs. (68 kg), Shipping 175 lbs. (79 kg)

CONNECTIONS - ELECTRIC Power Cord - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

3/8" OD Hard Tube

CUBE CONTROL SYSTEM Float Switch

HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer

ICE MAKING WATER CONTROL Time Controlled. Overflow Pipe

COOLING WATER CONTROL N/A

BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control

COMPRESSOR Hermetic, Model RST64C1E-CAZ-202

CONDENSER Air-Cooled , Fin and Tube Type

EVAPORATOR Vertical Type, Stainless Steel and Copper

REFRIGERANT CONTROL Thermostatic Expansion Valve

REFRIGERANT CHARGE R404A, 1 lb. 2.5 oz. L33 (525g)

DESIGN PRESSURE High 467PSIG, Low 230PSIG

P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )

COMPRESSOR PROTECTION Auto-Reset Protector ( Internal )

REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch

LOW WATER PROTECTION Float Switch

ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Storage Bin

OPERATING CONDITIONS VOLTAGE RANGE 198-254VAC

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

ENG.F-011.1.0205

9

C. KM-650MAH-E

Note: We reserve the right to make changes in specications and design without prior

notice.

AC SUPPLY VOLTAGE 220-240/50/1

AMPERAGE 6.8 A ( 5 Min. Freeze AT 109°F / WT 59°F)

MINIMUM CIRCUIT AMPACITY 15 A

MAXIMUM FUSE SIZE 15 A

APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)

PER 24 HR. Temp.(°F) 50 70 90

lbs./day ( kg/day ) 70 *653 (296) 610 (277) 558 (253)

Reference without *marks 80 620 (281) 554 (251) 506 (229)

90 610 (277) *507 (230) 456 (207)

100 602 (273) 495 (225) 409 (186)

FOR THE EUROPEAN MARKET 10/10°C 20/15°C 30/25°C

ICE CAPACITY lbs./day (kg/day) 734 (333) 603 (274) 535 (243)

SHAPE OF ICE Crescent Cube

ICE PRODUCTION PER CYCLE 14 lbs. (6.4 kg) 720pcs.

APPROXIMATE STORAGE CAPACITY N/A

ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F

ELECTRIC W (kWH/100 lbs.) 1200(5.7) 1090(4.0)

WATER gal./24HR (gal./100 lbs.) 94(18.5) 162(24.8)

EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 37-7/16" (560 x 695 x 950 mm)

EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)

WEIGHT Net 169 lbs. (77 kg), Shipping 200 lbs. (91 kg)

CONNECTIONS - ELECTRIC Power Cord - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

3/8" OD Hard Tube

CUBE CONTROL SYSTEM Float Switch

HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer

ICE MAKING WATER CONTROL Time Controlled. Overflow Pipe

COOLING WATER CONTROL N/A

BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control

COMPRESSOR Hermetic, Model RST64C1E-CAZ-202

CONDENSER Air-Cooled , Fin and Tube Type

EVAPORATOR Vertical Type, Stainless Steel and Copper

REFRIGERANT CONTROL Thermostatic Expansion Valve

REFRIGERANT CHARGE R404A, 1 lb. 6.6 oz. (640g)

DESIGN PRESSURE High 467PSIG, Low 230PSIG

P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )

COMPRESSOR PROTECTION Auto-Reset Protector ( Internal )

REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch

LOW WATER PROTECTION Float Switch

ACCESSORIES -SUPPLIED N/A

-REQUIRED Ice Storage Bin

OPERATING CONDITIONS VOLTAGE RANGE 198-254VAC

AMBIENT TEMP. 45 -100° F

WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

ENG.F-011.1.0205

10

II. General Information

A. Construction

1. KM-320MAH-E

Thermostatic Bin Control

Auxiliary Code U-0 and Earlier

Control Switch

Expansion Valve

Compressor

Float Switch

Water Pump

Control Box

Drier

Fan Motor

Hot Gas Valve

Condenser

Water Supply Pipe

Spray Tubes

Main Transformer

(230V→115V)

High-Pressure

Switch

Strainer

Thermistor

Evaporator

Inlet Water Valve

Power Cord with

Fused Plug

(250V, 13A fuse)

Mechanical Bin Control

Auxiliary Code U-1 and Later

U-0 and Earlier

U-1 and Later

11

2. KM-515MAH-E

Main Transformer

(230V→115V)

Control Switch

Expansion Valve

Compressor

Float Switch

Water Pump

Control Box

Drier

Fan Motor

Hot Gas Valve

Condenser

Water Supply Pipe

Spray Tubes

High-Pressure

Switch

Strainer

Thermistor

Liquid Line Valve

Evaporator

Inlet Water Valve

Thermostatic Bin Control

Auxiliary Code U-1 and Earlier

Mechanical Bin Control

Auxiliary Code U-2 and Later

U-1 and Later

U-0 and Earlier

Power Cord with

Fused Plug

(250V, 13A fuse)

12

3. KM-650MAH-E

Main Transformer

(230V→115V)

Control Switch

Thermostatic

Expansion Valve

Compressor

Float Switch

Water Pump

Control Box

Drier

Fan Motor

Hot Gas Valve

Condenser

Water Supply Pipe

Spray Tubes

High-Pressure

Switch

Strainer

Thermistor

Evaporator

Inlet Water Valve

Thermostatic Bin Control

Auxiliary Code U-0 and Earlier

Mechanical Bin Control

Auxiliary Code U-1 and Later

U-1 and Later

U-0 and Earlier

Power Cord with

Fused Plug

(250V, 13A fuse)

13

B. Sequence of Operation

1. Sequence Cycles and Shutdown

a) "E" Control Board

KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier

KM-515MAH-E Auxiliary Code U-1 and Earlier

The steps in the sequence are as outlined below. When power is supplied, CB red

"POWER OK" LED comes on. There is a 5-second delay before startup. Note that the

order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.

(1) 1-Minute Fill Cycle

LED 4 is on. WV energizes and the ll period begins. After 1 minute, CB checks for

a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized

through additional 1-minute ll cycles until water enters the water tank and F/S closes.

This serves as a low water safety to protect PM.

(2) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains energized, Comp 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 adjustable harvest timer (S4 dip switch 1 & 2).

The harvest timer has settings of 60, 90, 120, and 180 seconds. 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 is energized during harvest for a maximum of 6 minutes or

the length of harvest, whichever is shorter. LED 4 turns off when WVde-energizes.

The minimum total time allowed by CB for a complete harvest cycle is 2 minutes. At

the end of harvest, CB checks position of F/S and proceeds to the freeze cycle if it is

closed or calls for a 1-minute ll if it is open.

(3) Freeze Cycle

LED 1 is on. Comp remains energized, PM, FM, and LLV(KM-515MAH-E) energize.

HGV and WV de-energize. For the rst 5 minutes, CB will not terminate the freeze

cycle. This minimum 5-minute freeze time is short cycle protection for Comp. As ice

builds on the evaporator, the water level in the water tank lowers. Freeze continues

until F/S opens, provided the 5-minute minimum freeze timer has terminated.

14

(4) Pump-Out Cycle

LEDs 1, 3, and 2 are on. Comp remains energized. HGV energizes. WV energizes if

S4 dip switch 3 off and 4 on (LED 4 on). LLV (KM-515MAH-E) and FM de-energize.

PM stops for 2 seconds then reverses for 10 or 20 seconds (S4 dip switch 3 & 4).

Water is removed from the bottom of the water tank through the check valve and

downthedrain.Atthesametime,waterowsthroughthesmallF/Stubetopower

ushF/S.Whenthepump-outtimerterminates,pump-outiscomplete.

The 1st pump-out occurs after the 1st freeze cycle, then every 10th cycle

thereafter(KM-320MAH-E) or every cycle thereafter (KM-515MAH-E and

KM-650MAH-E). The pump-out frequency control is factory set, and generally no

adjustment is required. However, the pump-out frequency control (S4 dip switch 5 &

6) can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For

details, see "II.C.3.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."

(5) Harvest Cycle

LEDs 1, 4, and 2 are on. Same as the initial harvest cycle. See "II.B.1.a)(2) Initial

Harvest Cycle."

Note: Icemaker continues to cycle until TBC is satised or power is turned off. The

icemaker always restarts at the 1-minute ll cycle.

(6) Shutdown

When ice contacts the thermostatic bulb (TBC switch open), TBC shuts down the

icemaker within 10 seconds. TBC is factory set, and generally no adjustment is

required. However, adjustment may be needed in some conditions, particularly at

higher altitude locations. NOTICE! Do not adjust S4 dip switch 7 out of the factory

default position. This dip switch must be left in the factory default position or

this icemaker will not operate correctly.

Legend: CB–control board; Comp–compressor; FM–fan motor; F/S–oatswitch;HGV–hot

gas valve; L LV–liquid line valve (KM-515MAH-E); PM–pump motor;

TBC–thermostatic bin control; WV–inlet water valve

15

b) "G" Control Board

KM-320MAH-E and KM-650MAH-E Auxiliary Code U-1 and Later

KM-515MAH-E Auxiliary Code U-2 and Later

The steps in the sequence are as outlined below. When power is supplied, the red

"POWER OK" LED and the green "BC CLOSED" LED on CB turn on (If yellow

"BC OPEN" LED is on, the icemaker will not start. In this case clear ice away from BC

actuator paddle in the storage bin area). A 5-second delay occurs at startup. Note that

the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.

(1) 1-Minute Fill Cycle

LED 4 is on. WV energizes and the ll period begins. After 1 minute, CB checks for

a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized

through additional 1-minute ll cycles until water enters the water tank and F/S closes.

This serves as a low water safety to protect PM.

(2) Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains energized, Comp 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 adjustable harvest timer (S4dip switch 1 & 2).

The harvest timer has settings of 60, 90, 120, and 180 seconds. 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 is energized during harvest for a maximum of 6 minutes

or the length of harvest, whichever is shorter. NOTICE! Do not adjust S4 dip switch

7 out of the factory default position. This dip switch must be left in the factory

default position or this icemaker will not operate correctly. For details, see

"II.C.3.e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7)." LED 4 turns

off when WV de-energizes. The minimum total time allowed by CB for a complete

harvest cycle is 2 minutes. At the end of harvest, CB checks position of F/S and

proceeds to the freeze cycle if it is closed or calls for a 1-minute ll if it is open.

(3) Freeze Cycle

LED 1 is on. Comp remains energized, PM, FM, and LLV(KM-515MAH-E) energize.

HGV and WV de-energize. For the rst 5minutes, CB will not terminate the freeze

cycle. At the end of 5 minutes, F/S assumes control of the freeze cycle. As ice builds

on the evaporator, the water level in the water tank lowers. Freeze continues until

F/S opens, provided the 5-minute minimum freeze timer has terminated. There is a

15second delay before CB acknowledges an open F/S.

16

(4) Pump-Out Cycle

LEDs 1, 3, and 2 are on. Comp remains energized. HGV energizes. WV energizes if

S4 dip switch 3 off and 4 on (LED 4 on). LLV (KM-515MAH-E) and FM de-energize.

PM stops for 2 seconds then reverses for 10 or 20 seconds (S4 dip switch 3 & 4).

Water is removed from the bottom of the water tank through the check valve and

downthedrain.Atthesametime,waterowsthroughthesmallF/Stubetopower

ushF/S.Whenthepump-outtimerterminates,pump-outiscomplete.

The 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter

(KM-320MAH-E) or every cycle thereafter (KM-515MAH-E and the KM-650MAH-E).

The pump-out frequency control is factory set, and generally no adjustment is

required. However, the pump-out frequency control (S4 dip switch 5 & 6) can be set

to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For details, see

"II.C.3.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."

"G" Control Board Settings

S4 Dip Switch Setting

Pump-Out

Frequency

1st Pump-Out

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

(5) Harvest Cycle

LEDs 1, 4, and 2 are on. Same as the initial harvest cycle. See "II.B.1.b)(2) Initial

Harvest Cycle."

Note: Icemaker continues to cycle until MBC is satised or power is turned off. The

icemaker always restarts at the 1-minute ll cycle.

(6) Shutdown

When MBC is activated (MBC open), the yellow "BC OPEN" LED comes on. The

icemaker then shuts down as outlined in the table below.

Cycle at

Mechanical Bin

Control Activation

Shutdown

Fill Cycle 15 seconds after activation.

Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated

at the end of the harvest cycle.

Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short

cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.

Legend: CB–control board; Comp–compressor; FM–fan motor; F/S–oatswitch; 

HGV–hot gas valve; L LV–liquid line valve (KM-515MAH-E); MBC–mechanical bin

control; PM–pump motor; WV–inlet water valve

17

2. Sequence Flow Chart

a) "E" Control Board:

KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier

KM-515MAH-E Auxiliary Code U-1 and Earlier

•Maximuminletwatervalvetime:6min.

•Maximumharvesttime:20min.

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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.

Legend:

Comp–compressor

FM–fan motor

F/S–oatswitch

HGV–hot gas valve

LLV–liquid line valve (KM-515MAH-E)

PM–pump motor

TBC–themostatic bin control

WV–inlet water valve

1. Bin Full

Within 10 sec.

after ice contacts

TBC bulb,

icemaker shuts

down.

Shutdown

and Restart

TBC

Operation

Ice contacts TBC bulb

2. Icemaker Off

All components

de-energized.

3. Ice Level Lowered

No ice touching

TBC bulb.

Icemaker starts at

"1. 1-Minute Fill Cycle."

TBC closed

TBC open

All components

de-energized

To 1 above

F/S check

1 to 3-min. harvest

timer in control

(S4 dip switch 1 & 2)

"E" Control Board Sequence Flow Chart

1. 1-Minute

Fill Cycle

Cycle

Steps

2. Harvest Cycle

Thermistor

in control

3. Freeze Cycle

•Minimumfreezetime:5min.

•Maximumfreezetime:freeze

timer setting

(S4 dip switch 9 & 10)

F/S in control

4. Pump-Out Cycle

•Factorysetforevery

10th cycle (S4 dip

switch 5 & 6)

•Pumpmotorstops

for 2 sec., then

reverses for 10/20

sec. (S4 dip switch

3 & 4)

WV energized

F/S open

WV continues

Comp energized

HGV energized

Thermistor temperature

reaches 48°F (9°C) (3.9

kΩ or less). Harvest

timer starts (1 to 3 min.).

F/S open

Comp continues

FM energized

LLV energized

PM energized

HGV de-energized

WV de-energized

F/S closed

Comp continues

HGV energized

WV energized (dependent on

pump-out timer setting)

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

LLV de-energized

F/S check

Startup

If F/S is open, Comp stops and cycle returns to 1-min. ll.

5-min.

minimum

freeze timer in

control

F/S closed

F/S open or

freeze timer

terminates

KM-320MAH-E, KM-515MAH-E, KM-650MAH-E

18

b) "G" Control Board:

KM-320MAH-E and KM-650MAH-E Auxiliary Code U-1 and Later

KM-515MAH-E Auxiliary Code U-2 and Later

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

•Maximuminletwatervalvetime:6min.

•Maximumharvesttime:20min.

F/S check

Legend:

Comp–compressor

FM–fan motor

F/S–oatswitch

HGV–hot gas valve

LLV–liquid line valve (KM-515MAH-E)

MBC–mechanical bin control

PM–pump motor

WV–inlet water valve

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

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.

"G" Control Board Sequence Flow Chart

1. 1-Minute

Fill Cycle

Cycle

Steps

2. Harvest Cycle

Thermistor

in control

3. Freeze Cycle

•Minimumfreezetime:5min.

•Maximumfreezetime:freeze

timer setting

(S4 dip switch 9 & 10)

F/S in control

4. Pump-Out Cycle

•Factorysetforevery

10th cycle (S4 dip

switch 5 & 6)

•Pumpmotorstops

for 2 sec., then

reverses for 10/20

sec. (S4 dip switch

3 & 4)

WV energized

F/S open

WV continues

Comp energized

HGV energized

Thermistor temperature reaches

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts (1 to 3 min.).

F/S open

Comp continues

FM energized

LLV energized

PM energized

HGV de-energized

WV de-energized

F/S closed

Comp continues

HGV energized

WV energized (dependent on

pump-out timer setting)

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FM de-energized

LLV de-energized

F/S check

Startup

If F/S is open, Comp stops and cycle returns to 1-min. ll.

1. Bin Full

Shutdown Delay:

•Fill Cycle–15 sec. after activation.

•Harvest Cycle–At the end of the harvest cycle, or up to 15 sec. into the

freeze cycle if activated at the end of the harvest cycle.

•Freeze Cycle–15 sec. after activation if activated at least 15 sec. before

the 5-min. short cycle protection timer terminates

Otherwise, at the end of the next harvest cycle.

Shutdown

and Restart

MBC Operation

MBC open (MBC actuator paddle engaged)

Green "BC CLOSED" LED off

Yellow"BCOPEN"LEDon

Yellow"BCOPEN"LEDcontinues.

All components de-energized

5-min.

minimum

freeze timer

in control

F/S closed

F/S open or

freeze timer

terminates

2. Icemaker Off

All components

de-energized.

3. Ice Level Lowered

Icemaker starts at

"1. 1-Minute Fill Cycle."

To 1 above

MBC closed

(MBC actuator paddle disengaged)

Green "BC CLOSED" LED on

Yellow"BCOPEN"LEDoff

KM-320MAH-E, KM-515MAH-E, KM-650MAH-E

19

C. Control Board

•A Hoshizaki exclusive control board is employed in Hoshizaki icemakers.

•All models are pretested and factory adjusted.

•For a control board check procedure, see "IV.B. Control Board Check."

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misconnectterminals.

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

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

20

"E" Control Board

Part Number 2A1410-02

"E" Control Board

1. Control Board Layout

a) "E" Control Board

KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier

KM-515MAH-E Auxiliary Code U-1 and Earlier

Microprocessor

(board revision level

indicated by last

2 digits on label)

• Part Number

• K1 Connector

Pins #1 through #10

#1, 9 Magnetic Contactor

#2 Hot Gas Valve

#3 Fan Motor (all)

Liquid Line Valve

(KM-515MAH-E)

#4 Pump Motor (icemaking)

#5 Pump Motor (pump-out)

#6 Inlet Water Valve

#7, 10 Power Supply Voltage

#8 Open

Switch for "C" control board

and "ALPINE" control board

(service control board only)

Set to "ALP" for icemakers

covered in this manual.

• Freeze Timer

LED (yellow)

• Harvest Backup

Timer LED (orange)

• K2 Connector

Control Transformer

(10.5VAC)

• "ALARM RESET" Button

• S4 Dip Switch

• "OUTPUT TEST" Button

(used to test relays on control board)

• K3 (white) Connector

Harvest Control

(thermistor)

• K4 (red) Connector

Mechanical Bin Control

(open on thermostatic bin

control application)

• K5 (black) Connector

Float Switch

• LED 1 (X1 Relay)

K1 Connector Pin #1, #9

• LED 4 (X4 Relay)

K1 Connector Pin #6

• LED 3 (X3 Relay)

LED 3 on:

K1 Connector Pin #5

LED 3 off:

K1 Connector Pin #4

(energized in freeze)

• LED 2 (X2 Relay)

LED 2 on:

K1 Connector Pin #2

LED 2 off:

K1 Connector Pin #3

• Relay LEDs

(4) (indicate which

relays are energized

and which K1

connector pins are

energized

• Power LED (red)

(lights when

10.5VAC is

supplied to

K2 connector)

• Alarm Buzzer

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