Hoshizaki American, Inc. KM-1301SAH-E Service Manual

Hoshizaki America, Inc.

Hoshizaki

Stackable Crescent Cuber

Models KM-1301SAH-E

“A Superior Degree

of Reliability”

www.hoshizaki.com

KM-1301SWH-E KM-1301SRH-E

SERVICE MANUAL

™

Number: 73172 Issued: 9-4-2009 Revised: xx-xx-xxxx

IMPORTANT

Only qualied service technicians should install, service, and maintain the icemaker. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, component life, and warranty coverage.

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, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance.

HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 3069

Attn: Hoshizaki Technical Support Department

Phone: 1-800-33-1940 Technical Support (770) 487-331 Fax: 1-800-843-1056 (770) 487-3360 E-mail: techsupport@hoshizaki.com

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 icemaker is serviced or maintenance operations are performed. Only qualied service technicians should install, service, and maintain the icemaker. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 6

I. Specications ..................................................................................................................... 7

A. Icemaker ....................................................................................................................... 7

1. KM-1301SAH-E (air-cooled) ................................................................................... 7

. KM-1301SWH-E (water-cooled) .............................................................................. 8

3. KM-1301SRH-E (remote air-cooled) ....................................................................... 9

B. Condenser Unit ........................................................................................................... 10

II. General Information ......................................................................................................... 1

A. Construction ................................................................................................................ 1

1. KM-1301SAH-E (air-cooled) ................................................................................. 1

. KM-1301SWH-E (water-cooled) ............................................................................ 13

3. KM-1301SRH-E (remote air-cooled) ..................................................................... 14

B. Sequence of Operation ............................................................................................... 15

1. Sequence Cycles and Shutdown .......................................................................... 15

a) 1-Minute Fill Cycle ........................................................................................... 15

b) Initial Harvest Cycle ........................................................................................ 15

c) Freeze Cycle ................................................................................................... 15

d) Pump-Out Cycle ............................................................................................. 16

e) Harvest Cycle ................................................................................................. 16

f) Shutdown .......................................................................................................... 16

. Sequence Flow Chart ............................................................................................ 17

C. Control Board ............................................................................................................. 18

1. Control Board Layout ............................................................................................ 19

. Features ................................................................................................................

a) Maximum Water Supply Period - 6 minutes .................................................... 0

b) Harvest Backup Timer and Freeze Timer ........................................................ 0

c) High Temperature Safety ................................................................................. 0

d) Low Water Safety ............................................................................................ 0

e) High Voltage and Low Voltage Cut-outs .......................................................... 0

f) LED Lights and Audible Alarm Safeties ............................................................ 1

3. Controls and Adjustments ..................................................................................... 

a) Default Dip Switch Settings ............................................................................. 

b) Harvest Timer (S4 dip switch 1 & ) ................................................................

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

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

e) Harvest Pump Timer (S4 dip switch 7) ............................................................ 4

f) Factory Use (S4 dip switch 8) ........................................................................... 4

g) Freeze Timer (S4 dip switch 9 & 10) ............................................................... 4

h) Float Switch Control (S5 dip switch 1) ............................................................ 5

i) Rell Counter (S5 dip switch  through 5) ........................................................ 5

0



D. Bin Control .................................................................................................................. 6

E. Float Switch ................................................................................................................ 6

F. Thermistor ................................................................................................................... 6

G. Control Switch ............................................................................................................ 6

III. Technical Information ..................................................................................................... 7

A. Water Circuit and Refrigeration Circuit ....................................................................... 7

1. KM-1301SAH-E (air-cooled) ................................................................................. 7

. KM-1301SWH-E (water-cooled) ............................................................................ 8

3. KM-1301SRH-E (remote air-cooled) ..................................................................... 9

B. Wiring Diagrams ......................................................................................................... 30

1. Auxiliary Code T-0, U-0 ........................................................................................ 30

a) KM-1301SAH-E (air-cooled) ............................................................................ 30

. Auxiliary Code U-1 and Later ............................................................................... 31

a) KM-1301SAH-E (air-cooled) ........................................................................... 31

b) KM-1301SWH-E (water-cooled) ..................................................................... 3

c) KM-1301SRH-E (remote air-cooled) ................................................................ 33

C. Performance Data ...................................................................................................... 34

1. KM-1301SAH-E (air-cooled) ................................................................................. 34

. KM-1301SWH-E (water-cooled) ........................................................................... 35

3. KM-1301SRH-E (remote air-cooled) ..................................................................... 36

IV. Service Diagnosis .......................................................................................................... 37

A. Diagnostic Procedure ................................................................................................ 37

B. Control Board Check .................................................................................................. 41

C. Bin Control Check ....................................................................................................... 4

D. Float Switch Check and Cleaning ............................................................................... 4

1. Float Switch Check ................................................................................................ 4

. Float Switch Cleaning ............................................................................................ 43

E. Thermistor Check ....................................................................................................... 44

F. Diagnostic Charts ........................................................................................................ 45

V. Removal and Replacement of Components ................................................................... 53

A. Service for Refrigerant Lines ...................................................................................... 53

1. Refrigerant Recovery ............................................................................................ 53

. Brazing .................................................................................................................. 54

3. Evacuation and Recharge (R-404A) ..................................................................... 54

B. Removal and Replacement of Compressor ................................................................ 55

C. Removal and Replacement of Expansion Valve......................................................... 56

D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve............................ 57

E. Removal and Replacement of Evaporator .................................................................. 58

F. Removal and Replacement of Air-Cooled Condenser ................................................ 59

G. Removal and Replacement of Water-Cooled Condenser .......................................... 60

H. Removal and Replacement of Remote Air-Cooled Condenser .................................. 61

I. Removal and Replacement of Water Regulating Valve (water-cooled model) ............ 6

J. Adjustment of Water Regulating Valve (water-cooled model) .................................... 63

K. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)

(remote air-cooled model) ......................................................................................... 63

L. Removal and Replacement of Thermistor ................................................................... 64

M. Removal and Replacement of Fan Motor (air-cooled and remote air-cooled models) 65

N. Removal and Replacement of Inlet Water Valve ........................................................ 65

O. Removal and Replacement of Pump Motor................................................................ 66

P. Removal and Replacement of Control Board ............................................................. 67

VI. Cleaning and Maintenance ............................................................................................ 68

A. Cleaning and Sanitizing Instructions ........................................................................... 68

1. Cleaning Procedure ............................................................................................... 68

. Sanitizing Procedure - Following Cleaning Procedure .......................................... 70

B. Maintenance Instructions ............................................................................................ 71

C. Preparing the Icemaker for Long Storage .................................................................. 71

Important Safety Information

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

WARNING Indicates a hazardous situation which could result in death or

serious injury.

CAUTION Indicates a situation which could result in damage to the unit.

IMPORTANT Indicates important information about the use and care of the

unit.

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 eventual damage caused by improper, incorrect, and unreasonable use.

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

• 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 severe damage to equipment.

• This unit requires an independent power supply. See the nameplate for proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse can result in a tripped breaker, blown fuse, or damage to existing wiring. This could lead to heat generation or re.

• THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could result in death or serious injury.

• This unit should be disassembled or repaired only by qualied service personnel to reduce the risk of electric shock, injury, or re.

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

I. Specications

AC SUPPLY VOLTAGE 220-240/50/1 AMPERAGE 11.8 A ( 5 Min. Freeze AT 109°F / WT 59°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1114 (505) 1082 (491) 992 (450) Reference without *marks 80 1089 (494) 1039 (471) 924 (419)

90 1082 (491) *1004 (455) 897 (407)

100 1048 (475) 979 (444) 799 (362)

FOR THE EUROPEAN MARKET 10/10°C 20/15°C 30/25°C ICE CAPACITY lbs./day (kg/day) 1288 (584) 1151 (522) 1025 (465) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 29.1 lbs. (13.2 kg) 1440pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2120(5.1) 1900(4.1) WATER gal./24HR (gal./100 lbs.) 157(15.6) 537(48.2) EXTERIOR DIMENSIONS (WxDxH) 48" x 27-3/8" x 27-3/8" (1219 x 695 x 695 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 275 lbs. (125 kg), Shipping 315 lbs. (143 kg) CONNECTIONS - ELECTRIC Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 3/8" OD 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 Thermostat COMPRESSOR Hermetic, Model CS14K6E-PFJ-237 CONDENSER Air-Cooled , Fin and tube type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve REFRIGERANT CHARGE R404A, 3 lb. 9.1 oz. (1620g) 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

A. Icemaker

1. KM-1301SAH-E (air-cooled)

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

notice.

2. KM-1301SWH-E (water-cooled)

Intentionally Left Blank

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

notice.

3. KM-1301SRH-E (remote air-cooled)

Intentionally Left Blank

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

notice.

B. Condenser Unit

1. URC-14F

Unit: inches (mm)

Intentionally Left Blank

SPECIFICATIONS

AC SUPPLY VOLTAGE 115/60/1 (Connection to Icemaker)

FAN MOTOR 115 V Total 2.6FLA 130W

EXTERIOR DIMENSIONS (WxDxH) 35-11/16" x 15-11/16" x 21-15/16" (907.2 x 398 x 557.8 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 37-13/16" x 18-1/8" x 36-15/16" (960 x 460 x 937.8 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 80 lbs. ( 36 kg ) Shipping 87 lbs. ( 39 kg )

CONNECTIONS - ELECTRIC Permanent - Connection

- REFRIGERANT Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)

Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)

CONDENSER Air-cooled, Fin and tube type

FAN MOTOR PROTECTION Thermal Protection

REFRIGERANT CONTROL Condensing Pressure Regulator

REFRIGERANT CHARGE R-404A 4 lb. 7 oz. (2000g)

DESIGN PRESSURE High 467 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 104 ~ 127 V

AMBIENT TEMP. -20 ~ 122 °F

ACCESSORIES -SUPPLIED Leg 2 pcs

Hex. Head Bolt w/Washer 8 x 16 8 pcs

Hex. Nut 8 8 pcs

MODEL: URC-14F

Intentionally Left Blank

II. General Information

A. Construction

1. KM-1301SAH-E (air-cooled)

Evaporator Assembly

Check Valve (water)

Water Pump

Inlet Water Valve

Spray Tubes

Low-Side Service Valve

High-Side Service Valve

Expansion Valves

Water Supply Inlet

Junction Box

Hot Gas Valve

Check Valves

Air-Cooled Condenser

Control Box

Fan Blade

Float Switch

Compressor

Bin Control Thermostat

Control Switch

Fan Motor

Drier

Liquid Line Valve

Transformer Box

1

2. KM-1301SWH-E (water-cooled)

Evaporator Assembly

Intentionally Left Blank

Cleaning Valve

Check Valve (water)

Water Pump

Float Switch

Inlet Water Valve

Compressor

Spray Tubes

Low-Side Service Valve

High-Side Service Valve

Expansion Valves

Water Supply Inlet

Junction Box

Hot Gas Valve

Check Valves

Water-Cooled Condenser

Water Regulating Valve

Bin Control Thermostat

Control Switch

Drier

Control Box

Liquid Line Valve

Transformer Box (KM-1301SWH3)

3. KM-1301SRH-E (remote air-cooled)

Evaporator Assembly

Cleaning Valve

Intentionally Left Blank

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

Expansion Valves

Receiver Tank

Control Box

Compressor

Bin Control Thermostat

Control Switch

Transformer Box (KM-1301SRH3)

Access Valve

Drier

Liquid Line Valve

B. Sequence of Operation

IMPORTANT

This unit utilizes a thermostatic bin control. For operation, the K4 jumper (4A4883G01) must be in place on the control board RED K4 connector.

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED and green "BC CLOSED" LED come on. The green "BC CLOSED" LED is on continuously when the K4 jumper is in place. If CB yellow "BC OPEN" LED is on, check that CB has the K4 jumper in place on CB RED K4 connector. This unit will not operate unless the K4 jumper is in place. 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, .

a) 1-Minute Fill Cycle

LED 4 is on. WV and X relay (auxiliary code T-0 and U-0), X11 relay (auxiliary code U-1 and later) energize and the 1-minute ll cycle 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 lls the tank and closes F/S. This serves as a low water safety to protect PM.

b) Initial Harvest Cycle

LEDs 1, 4, and  are on. WV and X relay (auxiliary code T-0, U-0), X11 relay (auxiliary code U-1 and later) remain energized, HGV, X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later), Comp, and FMR 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 a 3.9 kΩ signal from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & ). The harvest timer has settings of 60, 90, 10, and 180 seconds. For details, see "II.C.3.b) Harvest Timer (S4 dip switch 1 & )." WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter. CAUTION! Do not adjust S4 dip switch 7 out of the factory

default position on this model. Adjustment outside of the factory default position may result in damage to the icemaker. For details, see "II.C.3.e) Harvest Pump Timer

(S4 dip switch 7)." LED 4 goes off when WV and X relay (auxiliary code T-0, U-0), X11 relay (auxiliary code U-1 and later) de-energize. LED 3 comes on and PM energizes and runs for the last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting. This circulates water over the evaporator for the last 0 or 50 seconds of harvest. PM is energized through the #5 pin (DBu wire) on the CB K1 ten-pin connector and the X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later). When the harvest timer expires, the harvest cycle is complete. CB checks the position of F/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute ll cycle if it is open. The minimum total time allowed by CB for a complete harvest cycle is  minutes.

c) Freeze Cycle

LED 1 is on. Comp and FMR remain energized, PM energizes or remains energized depending on harvest pump timer (S4 dip switch 7) setting. FM and LLV energize. HGV and X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later)

de-energize. For the rst 5 minutes, CB will not accept a signal from F/S. This minimum 5-minute freeze time is short cycle protection for Comp. At the end of 5 minutes, F/S assumes control. As ice builds on the evaporator, the water level in the tank lowers. The freeze cycle continues until F/S opens and terminates the cycle. There is a 15 second delay before CB acknowledges an open F/S.

d) Pump-Out Cycle

LEDs 1, 3, and  are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and 4 on.

CAUTION! Do not adjust S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this model prevents the unit from operating correctly and may cause damage. For details, see "II.C.3.c) Pump-Out Timer (S4 dip switch 3 & 4)." Comp and

FMR remain energized, HGV energizes, WV energizes if S4 dip switch 3 off and 4 on. LLV and FM de-energize. PM stops for  seconds then reverses, taking water from the bottom of the tank and forcing pressure against the check valve seat allowing water to go through the check valve and down the drain. At the same time, water ows through the small tube to power ush F/S. When the pump-out timer expires, the pump-out is complete.

The rst pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter. The pump-out frequency control is factory set, and generally no adjustment is required. However, where water quality is bad and the icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The pump-out frequency control (S4 dip switch 5 &

6) can be set to have a pump-out occur every cycle, or every , 5, or 10 cycles. Timing of the rst pump-out is dependent on S4 dip switch 5 & 6 settings. See the table below. For details, see "II.C.3.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After nd freeze cycle

ON OFF Every  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

e) Harvest Cycle

Same as the initial harvest cycle. See "II.B.1.b) Initial Harvest Cycle."

Note: Unit continues to cycle until BC is satised or power is turned off. The unit always

restarts at the 1-minute ll cycle.

f) Shutdown

When ice contacts the thermostatic bulb (BC switch open), BC shuts down the unit within 10 seconds. The bin control is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations.

Legend: BC–bin control; CB–control board; Comp–compressor; FMR–fan motor-remote;

FM–fan motor; F/S–oat switch; HGV–hot gas valve; LLV–liquid line valve; PM–pump motor; WV–inlet water valve

2. Sequence Flow Chart

for  sec., then

10th cycle (S4 dip

• Factory set for every

4. Pump-Out Cycle

reverses for 10/0

switch 5 & 6)

sec. (S4 dip switch

• Pump motor stops

3 & 4)

Comp continues

FMR continues

HGV energized

PM de-energizes for  sec.,

then reverses for 10/0 sec.

FM de-energized

LLV de-energized

F/S in control

(S4 dip switch 9 & 10)

• Minimum freeze time: 5 min.

• Maximum freeze time: freeze timer setting

5-min. timer in

control

3. Freeze Cycle

Harvest Pump

Timer

1 to 3-min. timer in control

(S4 dip switch 1 & )

F/S open or freeze

F/S closed

F/S check

0 or 50 sec.

PM energized

WV de-energized

timer expires

Comp continues

FMR continues

PM continues

FMS energized

LLV energized

HGV de-energized

F/S open

"G" Control Board Sequence Flow Chart

Thermistor temperature

reaches 48°F (9°C)

Harvest timer starts.

KM-1301SAH-E, KM-1301SWH-E, KM-1301SRH-E

Thermistor

50 sec. (S4 dip switch 7), whichever is shorter. DO

NOT ADJUST S4 dip switch 7 on this model.

• WV time: 6 min. or the length of harvest minus 0 or

• Maximum harvest time: 0 min.

2. Harvest Cycle

in control

F/S closed

(3.9 kΩ or less).

WV continues

Comp energized

FMR energized

HGV energized

To 1 above

3. Ice Level Lowered

No ice touching

thermostatic bulb.

Icemaker starts at

"1. 1-Minute Fill Cycle."

2. Icemaker Off

All components

de-energized.

BC closed

NOTE: Green "BC CLOSED" LED on continuously

when the K4 jumper is in place.

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. This allows cleaner and sanitizer to ow over the outside of the evaporator plate assembly.

BC-open

All components

de-energized

Fill Cycle

1. 1-Minute

Cycle Steps

F/S check

WV energized

Initial startup

begins here

after 5-sec.

delay

F/S open

If F/S is open, compressor stops and cycle returns to 1-Minute Fill Cycle

1. Bin Full

Within 10 sec.

unit shuts down.

after ice contacts

thermostatic bulb,

Ice contacts

thermostatic bulb

Legend:

BC–bin control

Shutdown

and Restart

BC Operation

Comp–compressor

FM–fan motor

FMR–fan motor-remote

F/S–oat switch

HGV–hot gas valve

LLV–liquid line valve

PM–pump motor

WV–inlet water valve

C. Control Board

• A Hoshizaki exclusive solid-state control board is employed in Hoshizaki Stackable Crescent Cubers.

• All models are pretested and factory set.

CAUTION

1. The control board is 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 unit before handling or replacing the control board.

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

4. Do not change wiring and connections. Do not misconnect K3, K4, and K5, because the same connector is used for the thermistor, K4 jumper, and oat switch. The control board RED K4 connector must have the K4 jumper in place for proper operation.

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

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

1. Control Board Layout

"G" Control Board

Bin Control Switch Closed LED (green) (on continuously in thermostatic bin control application)

Bin Control Switch Open LED (yellow) (mechanical bin control application only)

Part Number

Alarm Buzzer

Power LED (red) (lights when power is supplied to the control board)

Relay LEDs (4) (indicate which relays are energized as listed below)

LED  (X Relay) Hot Gas Valve (HGV) Fan Motor (FM) (FM off when LED on)

LED 3 (X3 Relay) Pump Motor (PM) (on at pump-out, harvest (if applicable))

LED 4 (X4 Relay) Inlet Water Valve (WV)

"ALARM RESET" Button

S4 Dip Switch

"OUTPUT TEST" Button (used to test relays on control board)

WHITE K3 Connector Harvest Control (thermistor)

RED K4 Connector K4 Jumper (4A4883G01 thermostatic bin control application) or Mechanical Bin Control

S5 Dip Switch

BLACK K5 Connector Float Switch

Label (control board revision level indicated on label on side of relay)

K1 Ten-Pin Connector

Pins #1 through #10 #1, 9 Magnetic Contactor # Hot Gas Valve (HGV) #3 Liquid Line Valve (LLV), Fan Motor (FM) #4 Pump Motor (icemaking) #5 Pump Motor (pump-out, harvest (if applicable)) #6 Inlet Water Valve (WV) #7, 10 Component Power Supply #8 Open

LED 1 (X1 Relay) Compressor (Comp), Fan Motor-Remote (FMR)

Switch for "C" control board and "ALPINE" control board (service control board only)

K Connector Transformer

Control Board

Part Number A379-01

2. Features

a) Maximum Water Supply Period - 6 minutes

The inlet water valve will be open during harvest for 6 minutes or the length of harvest minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter. For details, see "II.C.3.e) Harvest Pump Timer (S4 dip switch 7)."

b) Harvest Backup Timer and Freeze Timer

The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest cycle takes more than 0 minutes to complete. The control board will signal this problem using  beeps every 3 seconds. The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle takes longer than the time specied to complete. The control board will signal this problem using 3 beeps every 3 seconds. The freeze timer is factory set using S4 dip switch 9 & 10. For details, see "II.C.3.g) Freeze Timer (S4 dip switch 9 & 10). The "ALARM RESET" button on the control board must be pressed with power on to reset either of these safeties.

c) High Temperature Safety

The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety. This protects the unit from excessively high temperatures. If the evaporator temperature reaches 17°F±7°F (53°C±4°C), the control board reads a .8 kΩ signal from the thermistor and shuts down the icemaker. The control board will signal this problem using 1 beep every 3 seconds. The "ALARM RESET" button on the control board must be pressed with power on to reset the safety.

d) Low Water Safety

The control board checks the position of the oat switch at the end of the initial 1-minute ll cycle and at the end of each harvest cycle. If the oat switch is in the up position (electrical circuit closed), the control board changes to the next cycle. If the oat switch is in the down position (electrical circuit open), the control board changes to additional 1-minute ll cycles until water enters the tank and closes the oat switch. When the oat switch closes, the control board changes to the next cycle. The unit will not start without adequate water in the tank. This serves as a low water safety to protect the water pump. For water-cooled model, if the condenser water supply is shut off, the unit is protected by the high-pressure switch.

e) High Voltage and Low Voltage Cut-outs

The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut-outs. If miswiring (especially on single phase 3 wire models) causes excessive voltage (147Vac±5% or more), the high voltage cut-out shuts down the circuit in 3 seconds and the icemaker automatically stops. The control board will signal this problem using 7 beeps every 3 seconds. The icemaker also automatically stops in cases of insufcient voltage (9Vac±5% or less). The control board will signal this problem using 6 beeps every 3 seconds. When the proper supply voltage is resumed, the icemaker automatically starts running again.

0

f) LED Lights and Audible Alarm Safeties

At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. The red LED indicates proper control voltage and will remain on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, . For details, see "II.B. Sequence of Operation."

Sequence Step LED

1-Minute Fill Cycle 4 WV 1 minute Harvest Cycle 1, 4,  Comp, FMR, WV,

Harvest Pump Timer 1, 3,  Comp, FMR, PM,

Freeze Cycle 1 Comp, FM/FMR,

Pump-Out Cycle 1, 4*, 3,  Comp, FMR, WV*,

Energized

Components

HGV

PM, LLV

PM, HGV

Min. Max. Avg.

 minutes 0 minutes 3 to 5 minutes

0 seconds 50 seconds harvest pump timer

5 minutes freeze timer

10 seconds 0 seconds *pump-out timer

Time LEDs are On

setting 30 to 35 minutes

setting

The built-in safeties shut down the unit and have alarms as listed below.

No. of Beeps

(every 3 sec.)

1 High Evaporator Temp.

(temperature > 17°F) (53°C)

Type of Alarm Notes

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

 Harvest Backup Timer

(harvest > 0 min. for two cycles in a row)

3 Freeze Timer

(freeze > specied setting for two cycles in a row) Timer is factory set using S4 dip switch 9 & 10

To reset the above safeties, press the "ALARM RESET" button with the power supply on.

6 Low Voltage

(9Vac±5% or less)

7 High Voltage

(147Vac±5% or more)

Check for open thermistor, HGV not opening, TXV or LLV leaking by, low charge, or inefcient Comp.

Check for F/S stuck closed (up), WV leaking by, HGV leaking by, PM not pumping, TXV not feeding properly, LLV not opening, low charge, HM not bypassing, or inefcient Comp.

Red LED will turn off if voltage protection operates. The control voltage safeties automatically reset when voltage is corrected.

Legend: Comp–compressor; FM–fan motor; FMR–fan motor-remote; F/S–oat switch;

HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve; WV–inlet water valve

1

3. Controls and Adjustments

CAUTION

Dip switches are factory set. Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact Hoshizaki Technical Support at 1-800-33-1940.

a) Default Dip Switch Settings

The dip switches are factory set to the following positions:

S4 Dip Switch

S4 Dip Switch No. 1 2 3 4 5 6 7 8 9 10

KM-1301SAH-E

KM-1301SWH-E

KM-1301SRH-E

S5 Dip Switch (Do Not Adjust)

S5 Dip Switch No.

KM-1301SAH-E OFF OFF OFF OFF OFF

KM-1301SWH-E

KM-1301SRH-E

OFF OFF ON ON ON ON ON OFF ON ON

Intentionally Left Blank

1 2 3 4 5

Intentionally Left Blank

Freeze Timer (9 & 10)

Factory Use (8)

Harvest Pump Timer (7) (Do not adjust)

Pump-Out Frequency Control (5 & 6)

Pump-Out Timer (3 & 4) (Do not adjust to 3 off and 4 on)

Harvest Timer (1 & )

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

The harvest timer starts when the thermistor reads 48°F (9°C) at the evaporator outlet and the control board reads the thermistor's 3.9 KΩ signal. The harvest timer is factory set, and generally no adjustment is required. However, a setting longer than the factory setting may be advised in cases where the ush provided at harvest needs to be prolonged for extra cleaning. Before changing this setting, contact Hoshizaki Technical Support at 1-800-33-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 4-hour production.

S4 Dip Switch Setting Time

No. 1 No. 2

OFF OFF 60

ON OFF 90

OFF ON 10

ON ON 180

(seconds)



+ 50 hidden pages