Hoshizaki KMS-1400MLH User Manual

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Page 1

Hoshizaki America, Inc.

Hoshizaki

Modular Crescent Cuber Serenity Series

Model KMS-1400MLH

“A Superior Degree

of Reliability”

www.hoshizaki.com

Including Condensing Unit Model SRK-14H/3

SERVICE MANUAL

™

Number: 73162 Issued: 2-28-2008

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IMPORTANT

Only qualied service technicians should attempt to install, service, or maintain this 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, 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 Service (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.



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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

I. Specications ..................................................................................................................... 6

A. Icemaker ....................................................................................................................... 6

1. KMS-1400MLH – SRK-14H .................................................................................... 6

. KMS-1400MLH – SRK-14H3 ................................................................................... 7

B. Condensing Unit ........................................................................................................... 8

1. SRK-14H ................................................................................................................. 8

. SRK-14H3 ............................................................................................................... 9

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

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

1. Icemaker ............................................................................................................... 10

. Condensing Unit ................................................................................................... 11

B. Sequence of Operation ............................................................................................... 1

1. One Minute Fill Cycle ............................................................................................ 1

. Initial Harvest Cycle .............................................................................................. 1

3. Freeze Cycle ........................................................................................................ 1

4. Pump-Out Cycle .................................................................................................... 1

5. Normal Harvest Cycle .......................................................................................... 13

C. Control Board ............................................................................................................. 15

1. Control Board Layout ............................................................................................ 16

. Features ................................................................................................................ 17

a) Maximum Water Supply Period – 6 minutes ...................................................... 17

b) Harvest Backup Timer and Freeze Timer .......................................................... 17

c) High Temperature Safety ................................................................................... 17

d) Low Water Safety ............................................................................................... 17

e) High Voltage and Low Voltage Cut-outs ............................................................ 17

f) LED Lights and Audible Alarm Safeties .............................................................. 18

3. Controls and Adjustments ..................................................................................... 19

a) Default Dip Switch Settings ................................................................................ 19

b) Harvest Timer (S4 dip switch 1 & ) ................................................................... 19

c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................... 0

d) Pump-Out Frequency Control (S4 dip switch 5 & 6) .......................................... 0

e) Factory Use (S4 Dip Switch 7 & 8) .................................................................... 0

f) Freeze Timer (S4 dip switch 9 & 10) ................................................................... 1

g) Float Switch Control and Rell Counter (S5 dip switch 1 through 5) .................. 1

4. Control Board Check Procedure ........................................................................... 1

5. Control Board Replacement ................................................................................ 

D. Harvest Control – Thermistor...................................................................................... 

Page 4

E. Float Switch ................................................................................................................ 3

1. Explanation of Operation ....................................................................................... 3

. Cleaning ................................................................................................................ 3

3. Float Switch Check Procedure ............................................................................. 3

F. Bin Control .................................................................................................................. 5

1. Explanation of Operation ....................................................................................... 5

. Bin Control Check Procedure ............................................................................... 5

G. Switches ..................................................................................................................... 6

1. Control Switch ....................................................................................................... 6

. Service Switch ....................................................................................................... 6

a) DRAIN ................................................................................................................ 6

b) CIRC. .................................................................................................................. 6

c) WASH ................................................................................................................. 6

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

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

B. Wiring Diagrams ......................................................................................................... 8

1. KMS-1400MLH – SRK-14H ................................................................................... 8

. KMS-1400MLH – SRK-14H3 ................................................................................. 9

3. Wire Harness Connections .................................................................................... 30

C. Performance Data ...................................................................................................... 31

1. KMS-1400MLH – SRK-14H ................................................................................... 31

. KMS-1400MLH – SRK-14H3 ................................................................................. 3

IV. Service Diagnosis .......................................................................................................... 33

A. 10-Minute Diagnostic Procedure ................................................................................ 33

B. Diagnostic Charts ....................................................................................................... 36

1. No Ice Production .................................................................................................. 36

. Evaporator is Frozen Up ....................................................................................... 39

3. Low Ice Production ................................................................................................ 40

4. Abnormal Ice ......................................................................................................... 40

5. Other ..................................................................................................................... 40

V. Removal and Replacement of Components ................................................................... 41

A. Service for Refrigerant Lines ...................................................................................... 41

1. Refrigerant Recovery ............................................................................................ 41

. Brazing. ................................................................................................................. 4

3. Evacuation and Recharge (R-404A) ..................................................................... 4

B. Condensing Unit ......................................................................................................... 43

1. Removal and Replacement of Compressor .......................................................... 43

. Removal and Replacement of Condenser ........................................................... 44

3. Removal and Replacement of Hot Gas Valve and Liquid Line Valve ................... 45

4. Removal and Replacement of Headmaster ......................................................... 46

5. Removal and Replacement of Fan Motor .............................................................. 46

C. Icemaker .................................................................................................................... 47

1. Removal and Replacement of Evaporator ............................................................ 47

. Removal and Replacement of Expansion Valve ................................................... 48

3. Removal and Replacement of Hot Gas Valve and Liquid Line Valve ................... 49

4. Removal and Replacement of Pump Motor .......................................................... 50

5. Removal and Replacement of Fill and Harvest Water Valve ................................ 50

6. Removal and Replacement of Thermistor ............................................................. 51

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VI. Cleaning and Maintenance ........................................................................................... 5

A. Cleaning and Sanitizing Instructions ........................................................................... 5

1. Cleaning Procedure ............................................................................................... 5

. Sanitizing Procedure - Following Cleaning Procedure .......................................... 54

B. Maintenance ............................................................................................................... 54

C. Preparing the Icemaker for Long Storage .................................................................. 55

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I. Specications

SPECIFICATION DATA NO. 08A001 ISSUED: January 22,2008

REVISED:

ITEM: HOSHIZAKI MODULAR CRESCENT CUBER WITH REMOTE COMPRESSOR/CONDENSER UNIT MODEL: KMS-1400MLH with SRK-14H

AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V ) AMPERAGE 15 A ( 5 Min. Freeze AT 104°F / WT 80°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 * 1284 (582) 1242 (564) 1164 (528) Reference without *marks 80 1252 (568) 1188 (539) 1097 (497)

90 1242 (564) * 1142 (518) 1054 (478)

100 1170 (531) 1121 (509) 974 (442) SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 24 lbs. ( 10.9 kg ) 1248 pcs. APPROXIMATE STORAGE CAPACITY N/A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2522 ( 5.3 ) 2354 ( 4.4 ) WATER gal./24HR (gal./100 lbs.) 270 ( 23.6 ) 560 ( 43.6 ) EXTERIOR DIMENSIONS (WxDxH) KMS-1400MLH : 30" x 24" x 28" ( 762 x 610 x 711 mm )

SRK-14H : 50" x 17" x 28" ( 1270 x 432 x 711 mm )

EXTERIOR FINISH KMS-1400MLH : Stainless steel; Galvanized steel ( Rear )

SRK-14H : Galvanized steel

WEIGHT KMS-1400MLH : Net 143 lbs. (65kg ), Shipping 177 lbs. (80kg)

SRK-14H : Net 230 lbs. (104kg ), Shipping 273 lbs. (124kg)

CONNECTIONS - ELECTRIC Permanent Connection

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

- CONDENSATE DRAIN 5/8" OD Pipe 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 Mechanical Level Switch and Timer COMPRESSOR Hermetic, Model CS18K6E-PFV CONDENSER Air cooled, Fin and Tube type EVAPORATOR Vertical type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator

REFRIGERANT CHARGE R-404A, 16 lb. 5 oz. ( 7400 g )

( Icemaker 7 oz.; Comp/Cond unit 15 lbs. 14 oz. ) DESIGN PRESSURE High 467 PSIG, Low 230 PSIG 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 or Dispenser OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP.

KMS-1400MLH 45 - 100° F

SRK-14H ( Outdoor use ) -20 - 122° F WATER SUPPLY TEMP. 45 - 90° F WATER SUPPLY PRESSURE 10 - 113 PSIG

A. Icemaker

1. KMS-1400MLH – SRK-14H

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

notice.

Page 7

2. KMS-1400MLH – SRK-14H3

Intentionally Left Blank

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

notice.

Page 8

B. Condensing Unit

AC SUPPLY VOLTAGE 208-230/60/1 ( 3 wire with neutral for 115V )

( Connection to icemaker )

AMPERAGE 15 A ( 5 Min. Freeze AT 104°F / WT 80°F )

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS ( WxDxH ) 50" x 17" x 28" ( 1270 x 432 x 711 mm )

DIMENSIONS INCLUDING LEGS ( WxDxH ) 52-3/8" x 19-1/2" x 43" ( 1330 x 495 x 1092 mm )

EXTERIOR FINISH Galvanized steel

WEIGHT Net 230 lbs. ( 104 kg ) Shipping 273 lbs. ( 124 kg )

CONNECTIONS - ELECTRIC Permanent - Connection

- REFRIGERANT Suction line 1-1/8-12 UNF Fitting ( # 11 Parker )

Liquid line 1-1/16-12 UNF Fitting ( # 10 Parker )

COMPRESSOR Hermetic, Model CS18K6E-PFV

CONDENSER Air cooled, Fin and Tube type

COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )

FAN MOTOR PROTECTION Thermal Protection

REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch

REFRIGERANT CONTROL Condensing Pressure Regulator

REFRIGERANT CHARGE 15 lbs. 14 oz. ( 7200 g )

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V

AMBIENT TEMP. ( Outdoor use ) -20 - 122° F

ACCESSORIES -SUPPLIED Leg 2 pcs

Hex. Head Bolt w/Washer M8 x 16 16 pcs

Hex. Nut M8 16 pcs

1. SRK-14H

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

notice.

Page 9

2. SRK-14H3

Intentionally Left Blank

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

notice.

Page 10

II. General Information

A. Construction

1. Icemaker

Spray Tubes

Hot Gas Valve

Liquid Line Valve

Service Valve (High Side)

Bin Control Switch

Control Switch

Service Switch

Drier

Wash Valve

Thermistor

Service Valve (Low Side)

Harvest Water Valve

Fill Water Valve

Control Box

Control Board

Pump Motor

Float Switch

Drain Water Valve

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2. Condensing Unit

Headmaster (C.P. Regulator)

Shut-off Valve (Low Side)

Condenser

Liquid Line Valve

Hot Gas Valve

Control Box

Junction Box

Receiver Tank

Accumulator

Fan Motor and Fan Blade

Shut-off Valve (High Side)

Compressor

Thermostat (Discharge Pipe)

Page 12

B. Sequence of Operation

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 the control board come on (If the yellow BC OPEN LED is on, the unit will not start. In this case clear ice away from the bin control actuator in the 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, .

1. One Minute Fill Cycle

LED 4 is on. FWV opens and the ll period begins. After 1 minute, the board checks for a closed LF/S. If LF/S is closed, the harvest cycle begins. If not, FWV will remain energized through additional 1 minute cycles until water enters the sump and LF/S closes. This serves as a low water safety to protect the water pump.

2. Initial Harvest Cycle

LEDs 1, 4 and  are on. Comp, FMR, HGVs, HWV and X1 relay energize, FWV closes. The control board monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), the control board reads a

3.9 kΩ signal from the thermistor and turns harvest termination over to the adjustable harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 10, and 180 seconds (S4 dip switch 1 & ). When the harvest timer completes its count down, the harvest cycle is complete and the freeze cycle starts. The minimum total time allowed by the board for a complete harvest cycle is  minutes. HWV is open during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. LED 4 goes off when HWV closes. PM energizes and runs for the last 50 seconds of harvest. LED 3 comes on when PM energizes. At the end of harvest, the control board checks the position of LF/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, FMR and PM continue to run, LLVs open, HGVs close. For the rst 5 minutes, the control board will not terminate the freeze cycle. As ice builds and LF/S opens, FWV opens (LED 4 is on when FWV is open). The rell will last until U/FS closes or for 60 seconds, whichever is shorter. After UF/S closes, FWV closes 3 seconds later. The KMS-1400MLH rells 1 time. After the rell, the freeze continues until LF/S opens again. The freeze cycle is then terminated, provided the 5 minute freeze timer has expired.

4. Pump-Out Cycle

The 1st pump out occurs after the 11th freeze cycle and every 10th cycle thereafter. LEDs 1, 3, and  are on. Comp and FMR continue to run, DWV opens, HGVs open, LLVs close. PM stops for  seconds. PM restarts, pumping water from the water tank through the DWV and down the drain. At the same time, water ows through the vent tube to power ush the F/S. After 10 seconds, the pump out is complete. The pump-out frequency control is factory-adjusted to drain the water tank every 10 cycles, and 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. See "II.C.3.d) Pump-Out Frequency Control."

1

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5. Normal Harvest Cycle

LEDs 1, 4 and  are on. Comp, FMR and HGVs remain energized. HWV and X1 relay energize, PM stops. As the evaporator warms, the thermistor reaches 48°F (9°C). The control board then receives the thermistor's 3.9 kΩ signal and starts the harvest timer. When the harvest timer completes its count down, the harvest cycle is complete. The minimum total time allowed by the board for a complete harvest cycle is  minutes. HWV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. LED 4 goes off when HWV closes. PM energizes and runs for the last 50 seconds of harvest. LED 3 comes on when PM energizes. At the end of harvest, the control board checks the position of LF/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute ll if it is open. The unit continues to cycle through freeze and harvest cycles until the bin control activates (opens) and shuts the unit down.

Note: To prevent incomplete batches of ice from forming on the evaporator, the control

board will only shut down the machine within the rst 5 minutes of the freeze cycle. If ice pushes the bin control actuator in (open) after the rst ve minutes of the freeze cycle, the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine.

Legend: Comp–compressor; DWV–drain water valve; FMR –remote fan motor; F/S–oat

switch; FWV–ll water valve; HGV–hot gas valve; HWV–harvest water valve;

LF/S–lower oat switch contacts; LLV–liquid line valve; PM–pump motor;

UF/S–upper oat switch contacts

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Pump motor stops

for  sec. and then

4. Pump-Out Cycle

Factory set for every

10th cycle

runs for 10 sec.

Lower oat

switch in

3. Freeze Cycle

5 minute timer

• Minimum freeze time: 5 minutes

• Maximum freeze time: freeze timer setting

• Lower oat switch used to initiate water

tank rell (1 rell for KMS-1400MLH)

• Upper oat switch used to terminate

water tank rell (1 minute maximum ll time)

control

in control

LF/S closed

PM de-energizes  sec. ,

energizes for 10 sec.

Comp continues

FMR continues

DWV energized

HGV energized

LLV de-energized

Freeze cycle

operation turned

over to LF/S

Comp continues

FMR continues

PM continues

LLV energizes

FWV energized/

for rell only

HGV de-energized

de-energized

50 sec.

LF/S check

PM energized

1 to 3 minute timer

in control

HWV de-energized

Thermistor temp

2. Harvest Cycle

Thermistor in

(HWV time is 6 minutes or the length of

harvest minus 50 sec., whichever is shorter.

PM energizes and runs for the last 50 sec. of

• Maximum harvest water valve time: 6 minutes

KMS-1400MLH Sequence Flow Chart and Component Operation

Fill Cycle

harvest.)

• Maximum harvest time: 0 minutes

1. One Minute

control

LF/S closed

LF/S check

Comp energized

FMR energized

HGV energized

LF/S open

FWV energized

LF/S open

reaches 48°F (9°C)

(3.9 kΩ or less)

Harvest timer starts

HWV energized

FWV de-energized

DWV de-energized

If LF/S is open, compressor stops and cycle returns to 1 minute ll

Power is supplied to the pump and drain valve. This drains the water tank.

Power is supplied to the pump only. This operation can be used to circulate cleaner and

sanitizer for extended periods of time over the outside surface of the evaporator.

DRAIN

Components Energized when the Control Switch is in the SERVICE Position

When in the "SERVICE" position, the control switch supplies power to the service switch and the machine is

in service mode. The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information

CIRC.

below for details of each function.

Power is supplied to the pump and wash valve. This operation is used to circulate cleaner

and sanitizer over both the inside and outside surfaces of the evaporator.

WASH

Cycle Steps

"G" board will have

Initial startup always

5 second delay

begins here

Legend:

Comp - compressor

DWV - drain water valve

FMR - remote fan motor

FWV - ll water valve

HGV - hot gas valve

HWV - harvest water valve

LF/S - lower oat switch contacts

LLV - liquid line valve

PM - pump motor

UF/S - upper oat switch contacts

Page 15

C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in the KMS-1400MLH Modular Crescent Cuber.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

. A 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 when handling or replacing the board.

3. Do not touch the electronic devices on the board or the back of the board to prevent damage to the board.

4. Do not change wiring and connections. Do not misconnect K3, K4 and K5, because the same connector is used for the thermistor, mechanical bin control and oat switch.

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

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

Page 16

1. Control Board Layout

Control Products "G" Control Board

Bin Control Switch Closed LED (green)

Bin Control Switch Open LED (yellow)

Part Number

Alarm Buzzer

LED  (green) Hot Gas Valves (HGV)

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

LED 3 (green) Pump Motor (PM) (PM on, but LED off, at freeze cycle)

LED 4 (green) Fill Water Valve (FWV) (when LED  is off) Harvest Water Valve (HWV) (when LED  is on)

LED 1 (green) Compressor (Comp)

Alarm Reset Button

S4 Dip Switch

Output Test Button (used to test relays on board)

Connector K3 Harvest Control (thermistor)

Connector K4 Mechanical Bin Control

S5 Dip Switch (factory set do not adjust) Connector K5 Float Switch

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

Connector K1

Pins #1 through #10 #1, 9 Magnetic Contactor # Hot Gas Valves (HGV) Water Valve Relay #3 Liquid Line Valves (LLV) #4 Pump Motor (icemaking) #5 Pump Motor (harvest) #6 Fill Water Valve (FWV) #7 10 Supply Voltage #8 Open

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

Connector K Transformer

Control Board

Part Number A379-01 (factory); 2A3792-02 (service)

Page 17

2. Features

a) Maximum Water Supply Period – 6 minutes

The harvest water valve will be open during harvest for 6 minutes or the length of harvest minus 50 seconds, whichever is shorter.

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 time is factory set using 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 rises above 17 ± 7°F (53 ± 4°C), the control board reads a .804 k and the icemaker automatically stops. 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.

Ω signal from the thermistor and operates the safety. This shuts down the circuit

d) Low Water Safety

The control board checks the position of the lower oat switch at the end of the initial one minute water ll cycle and at the end of each harvest cycle. If the lower oat switch is closed, the control board proceeds to the next cycle. If the lower oat switch is open, the control board calls for a one minute water ll cycle. After one minute, the control board checks the position of the oat and either proceeds to the next cycle if the lower oat switch is closed or calls for an additional one minute ll if the switch is open. This serves as a low water safety to protect the water pump.

e) High Voltage and Low Voltage Cut-outs

High voltage and low voltage cut-outs help protect the icemaker from supply voltages outside of the accepted range. If miswiring causes excessive voltage (147Vac ±5% or more for 3 seconds) on the control board, the high voltage cut-out shuts down the circuit 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.

Page 18

f) LED Lights and Audible Alarm Safeties

The control board includes LED indicator lights, audible alarm safeties, and an output test. The red LED indicates control voltage and will remain on unless a control voltage problem occurs. At startup a 5-second delay occurs while the board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. 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 board is 1, 4, 3, . For more information, see "II.B. Sequence of Operation."

Sequence Step LED

1 Minute Fill Cycle 4 FWV 60 seconds Harvest Cycle 1, 4 and  Comp, FMR

Last 50 seconds of harvest, HWV de-energizes and PM energizes. LEDs 1, 3 and  are on. Freeze Cycle 1 (and 4 at

rells)

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

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

Energized

Components

HWV, HGV

Comp, FMR, PM, LLV (FWV at rell)

HWV*, PM, HGV, DWV,

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

Min. Max. Avg.

 minutes 0 minutes 3 to 5 minutes

5 minutes freeze timer

10 seconds 0 seconds *pump-out

Time LEDs are On

30 to 35

setting

minutes

timer setting

 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)

Legend: Comp–compressor; DWV–drain water valve; FMR–remote fan motor; FWV–ll

water valve; HGV–hot gas valve; HM–headmaster; HWV–harvest water valve;

LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve

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

Check for a oat switch stuck closed (up), HWV or FWV leaking by, HGV leaking by, PM not pumping, TXV not feeding properly, low charge, HM not bypassing or inefcient compressor.

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

Page 19

3. Controls and Adjustments

a) Default Dip Switch Settings

The dip switches are factory-adjusted to the following positions:

S4 Dip Switch

Dip Switch No. 1  3 4 5 6 7 8 9 10

KMS-1400MLH OFF OFF OFF ON ON ON ON OFF OFF ON

S5 Dip Switch (Do Not Adjust)

Dip Switch No.

KMS-1400MLH OFF ON OFF OFF OFF

1  3 4 5

Freeze Timer (9 & 10)

S4 Dip Switch

Normally off (8)

Do not adjust (7)

Pump-Out Frequency Control (5 & 6)

Pump-Out Timer (3 & 4)

Harvest Timer (1 & )

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

The harvest timer starts counting when the thermistor reads 48°F (9°C) at the evaporator outlet. No adjustment is required under normal use, as the harvest timer is adjusted to the suitable position. 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 will decrease 4 hour production.

Dip Switch Setting

No. 1

OFF

No. 

OFF 60

OFF 90

ON 10

ON 180

Time (seconds)

Page 20

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

During cycles when a pump out is called for, the pump motor drains the water tank for the time determined by the pump-out timer (T1). The pump-out timer's harvest timer (T) acts in place of the harvest timer (S4 dip switch 1 & ) during cycles with a pump out. The pump-out timer is factory-adjusted, and no adjustment is required.

Dip Switch Setting Time (seconds)

OFF OFF 10 150 Closed

ON OFF 10 180 Closed

OFF ON 10 10 Open

ON ON 0 180 Closed

T

Harvest Water

ValveNo. 3 No. 4

T1: Time to drain the water tank T: Harvest timer at pump out

Depending on the pump-out frequency control setting (dip switch 5 & 6), pump out occurs every cycle, or every nd, 5th or 10th cycle.

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

The pump motor drains the water tank at the frequency set by the pump-out frequency control. The pump-out frequency control is factory-adjusted to drain the water tank every 10 cycles, and 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 as shown in the table below.

Dip Switch Setting

No. 5 No. 6

OFF OFF every cycle

ON OFF every  cycles

OFF ON every 5 cycles

ON ON every 10 cycles

e) Factory Use (S4 Dip Switch 7 & 8)

Factory set for optimum performance. Do not adjust.

Frequency

0

Page 21

f) Freeze Timer (S4 dip switch 9 & 10)

CAUTION

Adjust to proper specication, or the unit may not operate correctly.

The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze-up issues. Upon termination of freeze timer, the control board initiates the harvest cycle. After  consecutive timer terminations, the control board shuts the machine down. In this case, see "IV.B.3. Low Ice Production" for possible solutions. The freeze timer is factory adjusted and no adjustment is required.

Dip Switch Setting

No. 9 No. 10

OFF OFF 60

OFF ON 50

ON OFF 70

ON ON 60

Time

(minutes)

g) Float Switch Control and Refill Counter (S5 dip switch 1 through 5)

Do not adjust. These must be left in the factory default position or the unit will not operate properly. The KMS-1400MLH rells 1 time.

4. Control Board Check Procedure

Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis.

1) Check the S4 and S5 dip switch settings to assure that they are in the factory default positions.

) Turn the control switch to "ICE" and check for proper control voltage. If the red LED

is on, the control voltage is good. If the red LED is off, check the control transformer circuit.

3) Check the 115 volt input at the wire harness terminals and the 10-pin connector. Check the brown and white wire at pin #10 to a white neutral wire for 115 volts. (Always choose a white neutral wire to establish a good neutral connection when checking voltages.) On the 10 pin connector, a jumper also feeds 115 volts into pin #7. If no voltage is present, check the 115 volt supply circuit.

4) The output test button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press the output test button. The correct lighting sequence should be 1, 4, 3, . Some components (e.g., the compressor) will cycle during the test. Note that the order of the relays from the outer edge of the board is 1, 4, 3, . After checking the sequence, the unit automatically starts at the 1 minute ll cycle. If the LEDs light in a different sequence, the control board is bad and should be replaced.

1

Page 22

5. Control Board Replacement

The dip switches should be adjusted to the factory default settings as outlined in this manual. S4 dip switch #8 must remain off.

D. Harvest Control – Thermistor

A thermistor (semiconductor) is used for a harvest control sensor. The resistance varies depending on the suction line temperatures. The thermistor detects the temperature of the evaporator outlet to start the harvest timer. No adjustment is required. If necessary, check for resistance between thermistor leads, and visually check the thermistor mounting, located on the suction line next to the evaporator outlet.

Temperature (°F) Temperature (°C) Resistance (kΩ)

0 -18 14.401

10 -1 10.614

3 0 6.000

50 10 3.871

70 1 .474

90 3 1.633

Check a thermistor for resistance by using the following procedure:

1) Disconnect the connector K3 on the board.

) Remove the thermistor. See "V.C.6. Removal and Replacement of Thermistor."

3) Immerse the thermistor sensor portion in a glass containing ice and water for  or 3 minutes.

4) Check for a resistance between thermistor leads. Normal reading is within 3.5 to 7 kΩ. Replace the thermistor if it exceeds the normal reading.



Page 23

E. Float Switch

1. Explanation of Operation

The oat operates  switches within the oat switch. The lower switch (black and blue wires) is used for low water safety protection, initiating the freeze cycle rell and terminating the freeze cycle. The upper switch (black and red wires) is used to terminate the freeze cycle rell only. Rell will last until the upper oat switch closes or the 1 minute countdown timer ends, whichever comes rst.

2. Cleaning

Depending on local water conditions, scale may build up on the oat, oat switch shaft and inside the housing. Scale on the oat or shaft can cause the oat to stick causing erratic operation. The oat switch should be cleaned and checked before replacing. First, disconnect the black K5 oat switch connector from the control board and remove the oat switch and rubber boot from the icemaker. Remove the rubber boot from the oat switch. Twist the mechanical lock at the top of the oat housing and lower out the oat and oat shaft. Remove the retainer clip from the shaft and slide the oat off the shaft. Soak the switch assembly in ice machine cleaner. Wipe down the shaft, oat, housing, and rubber boot with cleaning solution. See "VI. Cleaning and Maintenance Instructions."

3. Float Switch Check Procedure

Before replacing a oat switch that you suspect is bad, make sure the oat switch has been cleaned. This procedure will help you verify your diagnosis. The oat switch has three wires. The black wire is common. The blue wire is for the lower oat switch contact and the red wire is for the upper oat switch contact.

1) Disconnect the black K5 oat switch connector from the control board.

) Drain the reservoir water.

3) Turn the control switch to "ICE".

4) As water lls the reservoir, the oat switch contacts should close. Check continuity of the lower oat switch contacts using the black and blue wires and the upper oat switch contacts using the black and red wires. With the oat positioned all the way up, both oat switch contacts should be closed. If either oat switch contact fails, the assembly should be replaced.

5) Turn the control switch to "OFF".

6) Drain the reservoir water.

7) As water drains, the oat switch contacts should open. Check continuity of the upper oat switch contacts using the black and red wires and the lower oat switch contacts using the black and blue wires. With the oat positioned all the way down, both oat switch contacts should be open. If either oat switch contact fails, the assembly should be replaced.

8) Reconnect the black K5 connector to the control board when nished.

3

Page 24

Blue - Lower Switch

Housing

Lower Switch

Black - Common

Red - Upper Switch

Mechanical Lock

Upper Switch

Retainer Clip

Float

Fig. 1

Float Switch

4

Page 25

F. Bin Control

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

1. Explanation of Operation

The bin control is connected to the red K4 connector on the control board. When the bin control is calling for ice (proximity switch closed; green LED, BC CLOSED, on), the control board continues icemaking operations. When the bin control is activated in the bin full position (proximity switch open; yellow LED, BC OPEN, on), the control board shuts down the unit. However, to prevent incomplete batches of ice from forming on the evaporator, the control board will only shut down the machine within the rst 5 minutes of the freeze cycle. If ice pushes the lever in after the rst ve minutes of the freeze cycle, the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine.

2. Bin Control Check Procedure

1) Clear any ice away from the bin control.

) Turn the control switch to "ICE".

3) Check that the green "BC CLOSED" LED on the control board is on.

4) Activate the bin control actuator (press the actuator in). Check that the yellow "BC OPEN" LED on the control board is on.

5) Disconnect the red K4 bin control connector from the control board.

6) Check for continuity across the bin control leads. When calling for ice, the bin control proximity switch should be closed. If open, replace the bin control. Activate the bin control actuator (press the actuator in), check for continuity across the bin control leads. The bin control proximity switch should be open. If closed, replace the bin control.

7) Reconnect the red K4 connector. Allow the machine to cycle into the freeze cycle. In the rst 5 minutes of the freeze cycle, activate the bin control actuator (press the actuator in). The yellow "BC OPEN" LED should come on and the machine should turn off. If not, replace the control board.

Bin Control

Switch Closed (calling for ice)

Bin Control Switch Open (bin full)

5

Fig. 2

Bin Control

Page 26

G. Switches

Two control switches are used to control operation in KMS Series Modular Crescent Cubers. These switches are referred to as the "control switch" and the "service switch" and are located on the control box.

1. Control Switch

The control switch has three positions: "OFF" for power off; "ICE" for icemaking, and "SERVICE" to activate the service switch.

2. Service Switch

When the control switch is in the "SERVICE" position, the control switch supplies power to the service switch and the machine is in service mode. The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.

Note:

1. When the service switch is activated, power is supplied to the water pump in all three positions.

. When the control switch is in the "OFF" position or in the "ICE" position, the

service switch has no power and can be left in any position.

a) DRAIN

The KMS series utilizes a pump-out drain system. When the service switch is active and placed in the "DRAIN" position, power is supplied to the pump and drain valve.

b) CIRC.

When the service switch is active and placed in the "CIRC." position, power is supplied to the pump only. This operation can be used to circulate cleaner for extended periods of time over the outside surface of the evaporator.

c) WASH

The KMS series utilizes a solenoid operated wash (bypass) valve. When the service switch is active and placed in the "WASH" position, power is supplied to the pump and wash valve. This operation is used to circulate cleaner and sanitizer over both the inside and outside of the evaporator.

6

Page 27

III. Technical Information

A. Water Circuit and Refrigeration Circuit

SRK-14H/3

Strainer

Service Valve

Drier

Line Valve

Condenser

Fan

Line Valve

Headmaster

(C.P. Regulator)

Check Valve

Shutoff

Valve

Hot Gas

Valve

Access Valve

Strainer

Fusible Plug

High

Suction Line

OS Quick

Thermistor

Pressure

Switch

Strainer

Discharge

Line

Hot Gas

Valve

Thermostat

Compressor

Receiver Tank

Accumulator

Check Valve

Expansion Valve

Wash Valve

Water Supply

Harvest

Water Valve

KMS-1400MLH

Spray Tube

Evaporator

Fill

Water Valve

7

Float Switch

Drain

Water Valve

Drain

Pump Motor

Water Tank

Page 28

B. Wiring Diagrams

1. KMS-1400MLH – SRK-14H

Thermostat Switch **

Cut-out 66°F±9°F

Cut-in 39°F±9°F

PSIG

1

Transformer Output

10.5V at 115V

* Pressure Switch

Cut-out 41±

Cut-in 37±1 PSIG

8

Page 29

2. KMS-1400MLH – SRK-14H3

Thermostat Switch **

Cut-out 66°F±9°F

Cut-in 39°F±9°F

PSIG

1

Transformer Output

10.5V at 115V

* Pressure Switch

Cut-out 41±

Cut-in 37±1 PSIG

9

Page 30

3. Wire Harness Connections

P BK

V P

Neutral

LLV

HGV

KMS Icemaker Unit

(factory connected)

Wire Harness Connections

Fuse 10A

GND

SRK Condensing Unit

BK W

BR V

LLV

HGV

Neutral

Contactor

Legend:

GND-ground

HGV-hot gas valve

CB-control board

LLV-liquid line valve

L2-single phase power supply

Wire Color Code:

BK-black

BR-brown

GN-green

P-pink

V-violet

L3-three phase power supply

W-white

Page 31

C. Performance Data

PERFORMANCE DATA NO. 08A001 ISSUED: January 22,2008

REVISED:

ITEM: HOSHIZAKI MODULAR CRESCENT CUBER WITH REMOTE COMPRESSOR/CONDENSER UNIT MODEL: KMS-1400MLH with SRK-14H

70/21

1284

582

1242 564 1164 528

80/27 1252 568 1188 539 1097 497

90/32 1242 564

1142

518

1054 478

lbs./day kg./day

100/38 1170 531 1121 509 974 442

70/21

80/27

90/32

watts

100/38

70/21

560

2.12

475 1.80 413 1.56

80/27 495 1.87 363 1.37 331 1.25

90/32 475 1.80

270

1.02

223 0.85

gal./day m3/day

100/38 370 1.40 259 0.98 181 0.69

70/21

80/27

90/32

min.

100/38

70/21

80/27

90/32

min.

100/38

70/21

186

13.1

204 14.3 224 15.7

80/27 200 14.0 228 16.0 245 17.2

90/32 204 14.3

247

17.4

266 18.7

PSIG kg/cm2G

100/38 206 14.5 252 17.7 283 19.9

70/21

2.7 40 2.8 41 2.9

80/27 39 2.8 41 2.9 42 3.0

90/32 40 2.8

2.9

43 3.0

PSIG kg/cm2G

100/38 40 2.8 42 3.0 45 3.1

CONDENSER VOLUME (SRK-14H UNIT) 226 CU. IN

2468 2531 2597

APPROXIMATE ICE PRODUCTION PER 24 HR.

AMBIENT TEMP.

(ºF/ºC)

WATER TEMP. (ºF/ºC)

50/10 70/21 90/32

APPROXIMATE ELECTRIC CONSUMPTION

2354

2403 2449

2391 2468 2501

2403

2522

2561

APPROXIMATE WATER CONSUMPTION PER 24 HR.

FREEZING CYCLE TIME

23 26

26 27 29

HARVEST CYCLE TIME

5 5

5 4 4

4 3 2

TOTAL HEAT OF REJECTION (SRK-14H UNIT) 25270 BTU/h [ AT 90ºF (32ºC) / WT 70ºF (21ºC) ]

HEAD PRESSURE

SUCTION PRESSURE

1. KMS-1400MLH – SRK-14H

Note:

1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold

. We reserve the right to make changes in specications and design without prior

should be used for reference only.

notice.

Page 32

2. KMS-1400MLH – SRK-14H3

Intentionally Left Blank

Note:

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

. We reserve the right to make changes in specications and design without prior

notice.

3

Page 33

IV. Service Diagnosis

A. 10-Minute Diagnostic Procedure

The 10-minute check out procedure is basically a sequence check which can be used at unit start-up or for system diagnosis. Using this check out procedure will allow you to diagnose electrical system and component failures in approximately 10 minutes under normal operating conditions of 70°F (1°C) or warmer air and 50°F (10°C) or warmer water temperatures. Before conducting a 10 minute checkout, check for correct installation, proper voltage per unit nameplate and adequate water supply. As you go through the procedure, check to assure the components energize and de-energize correctly. If not, those components and controls are suspect.

1) Turn power off and access the icemaker's control box. Clear any ice from the bin control actuator located in the bin.

) Turn power on and place the control switch in the "ICE" position. A 5 second delay

occurs. The red "POWER OK" LED and the green "BC CLOSED" LED on the control board come on.

3) One Minute Fill Cycle – LED 4 is on. The ll water valve is energized. After 1 minute, the control board checks for a closed lower oat switch. If the lower oat switch is closed, the harvest cycle begins. If closed, continue to step 4. If the lower oat switch is open, the ll water valve will remain energized through additional 1 minute ll cycles until water enters the sump and the lower oat switch closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: If the ll water valve does not open, check for no supply voltage at water valve terminals, bad coil, or plugged screen or external lter (no water ow). If the reservoir lls, but the unit fails to start harvest, check for open lower oat switch (see "II.F.3. Float Switch Check Procedure") or bad 1 minute timer in control board. See "II.C.4. Control Board Check Procedure."

4) Initial Harvest Cycle – LEDs 1, 4 and  are on. The contactor coil energizes to start the compressor and fan motors, the hot gas valves energize (also energizing the X1 relay), the harvest water valve energizes and the ll water valve de-energizes. The harvest water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. The pump motor energizes and runs for the last 50 seconds of harvest.

The evaporator warms and the thermistor senses 48°F (9°C). The control board then

receives the thermistor's 3.9 kΩ signal and turns operation of harvest over to the harvest countdown timer. The last 50 seconds of the harvest countdown timer, the harvest water valve de-energizes and the water pump energizes, (LED 4 goes off and LED 3 comes on). When the harvest countdown timer completes, the freeze cycle starts. Diagnosis: Check if evaporator is warming up, compressor and fan motors are on, hot gas valves are open, harvest water valve open. If these are okay, next check for at least 48°F (9°C) on the suction line. If the evaporator is cool, check for inlet water too cold or liquid line valves stuck open. If the suction line is at least 48°F (9°C), disconnect the thermistor at the white K3 connector on the control board and check for resistance of 3.9 kΩ or less. If different, see "II.D. Harvest Control – Thermistor," for check procedure. Replace if necessary. If resistance is 3.9 kΩ or less, reconnect the thermistor to the white K3 connector on the control board. If harvest does not terminate within 3 minutes, replace the control board.

Page 34

5) Freeze Cycle – LED 1 is on. The compressor, fan motors and pump motor remain energized. The liquid line valves energize and the hot gas valves de-energize (also de-energizing the X1 relay). The lower oat switch activates (open)  times during the course of a freeze cycle; the rst is for rell, the second is for freeze termination. After the second lower oat switch activation, the control board terminates freeze and initiates harvest. Every 10th cycle, the control board initiates a 10 second pump-out cycle between the freeze and harvest cycles. See "II.C.3.d) Pump-Out Frequency Control."

a. Lower Float Switch 1st Activation: Rell – LEDs 1 and 4 are on. The rell can occur

at any time during the freeze cycle (1 rell per cycle). As ice builds the water level drops in the reservoir and the lower oat switch activates (opens). LED 4 comes on and the control board energizes the ll water valve. The ll water valve remains energized until the upper oat switch closes or the 1 minute ll timer terminates, whichever comes rst.

b. Lower Float Switch 2nd Activation: LED 1 is on. The unit is held in freeze by a

5 minute short cycle protection timer. After the 1st lower oat switch activation and rell, ice continues to form and the water level drops in the reservoir. When the lower oat switch activates (opens) a second time, the freeze cycle terminates (freeze can only be terminated on the second activation of the lower oat switch and after 5 minutes of freeze). Diagnosis: Minimum freeze time is 5 minutes. During the rst 5 minutes of freeze, conrm that the evaporator temperature drops, compressor, fan motors, pump motor, and liquid line valves are energized and that the hot gas valves, harvest water valve and ll water valve (except during rell) are de-energized and not bypassing. Make sure the expansion valves are operating properly and, in cold conditions, make sure the headmaster (C.P. Regulator) is operating correctly. Make sure that the drain water valve is not leaking by (water owing down the potable drain). Check for proper unit pressures (see "III.C. Performance Data"), or an inoperative compressor. Disconnect the black K5 oat switch connector from the control board. 15 seconds after disconnecting the black K5 oat switch connector, LED 4 comes on and rell begins. Connect the black K5 oat switch connector back on the control board. When the rell is nished (LED 4 goes off), disconnect the black K5 oat switch connector again. If 5 or more minutes have elapsed in the freeze cycle, the unit should switch out of the freeze cycle. After the unit switches out of freeze, reconnect the black K5 oat switch connector to the control board. If the unit remains in freeze with the oat switch disconnected, replace the board. To check the oat switch, see "II.F.3. Float Switch Check Procedure."

Note: Normal freeze cycle will last 30 to 35 minutes depending on model and

conditions. Cycle times and pressures should follow performance data provided in this manual.

Page 35

6) Pump-Out Cycle – The 1st pump out occurs after the 11th freeze cycle and every 10th cycle thereafter. LEDs 1, 3,  are on. The compressor and fan motors remain energized. The drain water valve, hot gas valves and X1 relay energize, the liquid line valves de-energize. The pump motor stops for  seconds then restarts for 10 seconds (pump out frequency can be adjusted on S4 dip switches 5 and 6). This pump out removes contaminants from the water reservoir through the drain water valve and allows for a power ush of the oat switch. Diagnosis: If the pump motor does not come on, check the circuit and capacitor. If water does not pump out, remove the drain water valve housing and check/clean the valve assembly, check for voltage on the drain valve coil with LED 3 on, make sure that the drain line is not clogged.

7) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 4. Note: Unit continues to cycle until bin control is satised or power is switched off. The

unit always restarts at the 1 minute ll cycle.

Page 36

B. Diagnostic Charts

1. No Ice Production

Problem Possible Cause Remedy

[1] The icemaker will not

start.

Power Supply

(Condensing Unit)

Water Supply 1. Water supply off or

High Pressure Control 1. Open contacts. 1. Check for continuity, let

Thermostat

(Condensing Unit High Temperature Safety)

Wire Harness Terminal

Block: Condensing Unit and Icemaker

Fuse (Icemaker fused

disconnect, if any)

Fuse (10A fuse in

icemaker)

Control Switch 1. "OFF" position. 1. Move to "ICE" position.

Transformer 1. Open windings. 1. Replace.

1. Off, blown fuse, or tripped breaker.

Loose connections. . Tighten.

.

3. Bad contacts. 3. Check for continuity and

4. Not within specications.

pressure too low.

.

Dirty condenser coil. . Clean.

3. Refrigerant overcharged.

4. Fan not operating. 4. See chart 1.[6]

5. Refrigerant line or components plugged.

1. Open contacts. 1. Let cool and reset. Check

1. Loose connection. 1. Tighten.

1. Blown. 1. Check for short circuit and

.

Bad contacts. . Check for continuity and

3. Loose connection. 3. Tighten.

1. Turn on, replace, or reset.

replace.

4. Refer to nameplate and correct.

1. Check and get recommended pressure.

reset or replace.

3. Recharge.

5. Clean and replace drier.

for continuity and replace if open.

correct. Reset or replace.

replace.

Bin Control 1. Tripped with bin lled

with ice.

.

Proximity switch stuck open.

Wiring to Control Board 1. Loose connections or

open.

1. Remove ice.

. Replace bin control.

1. Check for continuity and replace.

Page 37

Problem Possible Cause Remedy

[1] The icemaker will not

start. (continuted)

Water continues to

[]

be supplied, and the icemaker will not start.

[3] Compressor will

not start or stops operating.

Fill Water Valve 1. Mesh lter or orice

clogged.

Coil winding opened. . Replace.

.

3. Wiring to water valve. 3. Check for loose

Control Board 1. Defective. 1. See "II.C.4. Control Board

Control Board in Alarm 1. Audible alarm. 1. See "II.C..f) LED Lights

Float Switch 1. Connector

disconnected. Leads opened or

.

defective switch.

3. Float does not move freely.

Control Board 1. Defective. 1. Replace. See "II.C.4.

Control Switch 1. "SERVICE" position. 1. Move to "ICE" position.

Bad contacts. . Check and replace.

.

Control Board 1. Defective. 1. See "II.C.4. Control Board

Wire Harness Terminal

Block: Condensing Unit and Icemaker

Magnetic Contactor 1. Bad contacts. 1. Check for continuity and

Starter 1. Bad contacts. 1. Check and replace.

Start Capacitor or Run

Capacitor Overload Protector 1. Bad contacts. 1. Check for continuity and

Compressor 1. Wiring to compressor. 1. Check for loose

1. Loose connection. 1. Tighten.

Coil winding opened. . Replace.

.

Coil winding opened. . Replace.

1. Defective. 1. Replace.

Voltage too low. . Increase voltage.

.

3. Refrigerant overcharged or undercharged.

4. Line valve continues to close in freeze cycle and overload protector operates.

. Defective. . Replace.

1. Clean.

connection or open, and replace.

Check Procedure".

and Audible Alarm Safeties".

1. Reconnect.

. Check and replace.

3. Clean or replace.

Control Board Check Procedure."

Check Procedure."

replace.

3. Recharge.

4. Check line valves operation in freeze cycle and replace.

connection or open, and replace.

Page 38

Problem Possible Cause Remedy

[4] Water continues to

be supplied in freeze cycle (outside of rell).

[5] No water comes from

spray tubes. Water pump will not start, or freeze cycle time is too short.

[6] Fan motor will

not start, or is not operating.

[7] All components

run, but no ice is produced.

Fill or Harvest Water

Valve Control Board 1. Defective. 1. See "II.C.4. Control Board

Water Supply Line 1. Water pressure too

Fill or Harvest Water

Valve

Water System 1. Water leaks. 1. Check connections for

Pump Motor 1. Motor winding

Control Board 1. Defective. 1.

Fan Motor 1. Motor winding

Magnetic Contactor 1. Bad contacts. 1. Check for continuity and

Refrigerant 1. Undercharged. 1. Check for leaks and

Compressor 1. Defective valve. 1. Replace.

1. Diaphragm does not close.

low and water level in water tank too low.

1. Dirty mesh lter or orice and water level in water tank too low.

Clogged. . Clean.

.

3. Drain valve leaking by. 3. Check assembly and

opened.

Bearing worn out. . Replace.

.

3. Wiring to pump motor. 3. Check for loose

4. Defective capacitor. 4. Replace.

5. Defective or bound impeller.

6. Mechanical seal worn out.

opened.

Bearing worn out. . Replace.

.

3. Wiring to fan motor. 3. Check for loose

4. Defective capacitor. 4. Replace.

5. Fan blade bound. 5. Check and replace.

Air or moisture

.

trapped.

1. Check for water leaks with icemaker off.

Check Procedure".

1. Check and get recommended pressure.

1. Clean.

water leaks, and replace.

clean.

1. Replace.

connection or open, and replace.

5. Replace or clean.

6. Check and replace.

See "II.C.4. Control Board Check Procedure".

1. Replace.

connection or open, and replace.

replace.

recharge.

. Replace drier and

recharge.

Hot Gas Valve 1. Continues to open in

freeze cycle.

Liquid Line Valve 1. Continues to close in

freeze cycle.

Fill or Harvest Water Valve

1. Water valve is wide open during freeze (outside of rell).

1. Check and replace.

1. Check for water leaks.

Page 39

2. Evaporator is Frozen Up

Problem Possible Cause Remedy

[1]Freeze cycle time is

too long.

[]

All ice formed on evaporator does not fall into bin in harvest cycle.

a)Float Switch 1. Leads short-circuit or

defective switch.

. Float does not move

freely.

b)Fill or Harvest Water

Valve

Control Board

a)Evaporator 1. Scaled up. 1. Clean.

b)Water Supply Line 1. Water pressure too

c) Water Filter System 1. Dirty/restricted. 1. Replace lter.

d)Harvest Water Valve 1. Dirty mesh lter or

e) Ambient and/or Water

Temperature

f) Liquid Line Valve 1. Continues to open in

1. Diaphragm does not close.

1. Defective. 1.

low.

orice.

. Diaphragm does not

close.

1. Too cool. 1. Increase temperature.

harvest cycle.

1. Check and replace.

. Clean or replace.

1. Check for water leaks.

See "II.C.4. Control Board Check Procedure".

1. Check and get recommended pressure.

1. Clean.

. Check for water leaks.

1. Check operation in harvest cycle and replace.

g)Thermistor 1. Out of position or

loose attachment.

h)Control Board 1. Defective. 1.

[3]Other a) Spray Tubes 1. Clogged. 1. Clean.

Out of position. . Place in position.

.

b)Water System 1. Dirty. 1. Clean.

c) Refrigerant 1. Undercharged. 1. Check for leaks and

d)Expansion Valve 1. Bulb out of position or

loose attachment.

Defective. . Replace.

.

e)Hot Gas Valve 1. Coil winding opened. 1. Replace.

Plunger does not

.

move.

3. Wiring to hot gas valve.

f) Water Supply Line 1. Too small; requires

1/" OD line dedicated per machine.

g)Water Filter 1. Flow rate too small. 1. Replace with lter that has

1. See "V.C.6. Removal and Replacement of Thermistor."

See "II.C.4. Control Board Check Procedure".

recharge.

1. Place in position.

. Replace.

3. Check for loose connection or open, and replace.

1. Increase water line size.

larger ow rate.

Page 40

3. Low Ice Production

Problem Possible Cause Remedy

[1] Freeze cycle time is

long.

[]

Harvest cycle time is long.

a) See chart 1.[3]. Also check dirty condenser coil, ambient temperature and

refrigerant charge.

b) See chart .[1] and check oat switch, water valves and control board.

a) See chart .[] and check evaporator, water supply line, harvest water valve,

ambient and/or water temperature, liquid line valve, thermistor, and control board.

4. Abnormal Ice

Problem Possible Cause Remedy

[1] Small cubes. a) Ice Cube Guide or Ice

Separator

b) See chart 1.[5] and check water supply line, water valves, water system, pump

motor, and control board.

c) Drain Water Valve 1. Leaking. 1. Check and replace.

1. Out of position. Circulated water falls into bin.

1. Place in position.

Cloudy or irregular

[]

cubes.

a) See chart .[1] and .[3], and check oat switch, water valves, control board,

spray tubes, water system, refrigerant charge, and expansion valve.

b) Spray Guide 1. Dirty. 1. Clean.

c) Water Quality 1. High hardness or

contains impurities.

1. Install a water softener or lter.

5. Other

Problem Possible Cause Remedy

[1] Icemaker will not stop

when bin is lled with ice.

Abnormal noise. a)Pump Motor 1. Bearings worn out. 1. Replace.

[]

[3] Ice in storage bin

often melts.

a) Bin Control 1. Defective. 1. Replace.

b) Control Board 1. Defective. 1.

b) Fan Motor 1. Bearings worn out. 1. Replace.

. Fan blade deformed. . Replace fan blade.

3. Fan blade does not move freely.

c) Compressor 1. Bearings worn out or

cylinder valve broken.

. Mounting pad out of

position.

d) Refrigerant Lines 1. Rub or touch other

lines or surfaces.

a) Bin Drain 1. Plugged. 1. Clean.

b) Icemaker and Bin 1. Drains not run

separately.

See "II.C.4. Control Board Check Procedure".

3. Replace.

1. Replace.

. Reinstall.

1. Reposition.

1. Separate the drain lines.

Page 41

V. Removal and Replacement of Components

IMPORTANT

1.Ensure all components, fasteners, and thumbscrews are securely in place after the equipment is serviced.

. The Polyol Ester (POE) oils used in R-404A units can absorb moisture

quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.

3. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made.

4. Do not leave the system open for longer than 15 minutes when replacing or servicing parts.

A. Service for Refrigerant Lines

WARNING

Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

IMPORTANT

1. The condensing unit is provided with two shutoff valves, one on the low-side, one on the high-side and also with an access valve on the receiver tank. The icemaker unit is provided with two service valves, one on the low-side and one on the high-side.

. For refrigerant recovery, evacuation and recharge of the system, always use

the access valve on the receiver tank for the high-side and either the shutoff valve of the condensing unit or the service valve of the icemaker unit for the low-side line.

1. Refrigerant Recovery

Using proper refrigerant practices, recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere.

Page 42

2. Brazing.

WARNING

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

. Refrigerant R-404A itself is not explosive or poisonous. However, when

exposed to high temperatures (open ames), R-404A can be decomposed to form hydrouoric acid and carbonyl uoride both of which are hazardous.

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

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

5. Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

1) Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

Note: Because the pipes in the evaporator case are specially coated to resist corrosion,

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

3) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

3. Evacuation and Recharge (R-404A)

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

IMPORTANT

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

) Turn on the vacuum pump. Open the system service valves and service manifold

valves. Never allow the oil in the vacuum pump to ow backwards.

3) Allow the vacuum pump to pull down to a 9.9" Hg vacuum. Evacuating period depends on pump capacity.

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

4

Page 43

5) Disconnect the vacuum pump and attach a refrigerant service cylinder to the high-side line. Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the rating label inside the front panel on the icemaker or on the nameplate on the condensing unit. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.

6) A liquid charge is recommended for charging an R-404A system. Invert the service cylinder and place it on scales. Open the high-side valve on the service manifold.

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

8) If necessary, add any remaining charge to the system through the low-side. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side access port with the unit running.

9) Close the service manifold valves, the two refrigerant access valves and disconnect the service manifold hoses.

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

B. Condensing Unit

1. Removal and Replacement of Compressor

IMPORTANT

Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

Note: When replacing a compressor with a defective winding, be sure to install the

new start capacitor and start relay supplied with the replacement compressor. Due to the ability of the POE oil in the compressor to absorb moisture quickly, the compressor must not be opened more than 15 minutes for replacement or service. Do not mix lubricants of different compressors even if both are charged with R-404A, except when they use the same lubricant.

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the terminal cover on the compressor and disconnect the compressor wiring.

5) Remove the hold-down bolts, washers, and rubber grommets.

6) Remove the discharge and suction pipes.

7) Remove the compressor. Unpack the new compressor package.

8) Attach the rubber grommets of the prior compressor.

9) Place the compressor in position and secure it using the bolts and washers.

10) Remove the drier, then place the new drier in position, (located in the icemaker). Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

Page 44

11) Remove the plugs from the suction, discharge, and process pipes.

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

13) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

14) Evacuate the system and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

15) Connect the terminals and replace the terminal cover in its correct position.

16) Replace the panels in their correct positions.

17) Turn on the power supply.

2. Removal and Replacement of Condenser

IMPORTANT

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Disconnect the condenser refrigerant tubing.

5) Remove the condenser.

6) Place the new condenser in position and secure with the mounting screws.

7) Remove the drier, then place the new drier in position, (located in the icemaker). Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

8) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

10) Evacuate the system, and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

11) Replace the panels in their correct positions.

1) Turn on the power supply.

Page 45

3. Removal and Replacement of Hot Gas Valve and Liquid Line Valve

CAUTION

1. The condensing unit has 1 hot gas valve and 1 liquid line valve. Both valves have a strainer prior to the valve body. It is advisable to change the strainer when replacing the hot gas or liquid line valve.

. Always use a copper tube of the same diameter and length when replacing

the hot gas and liquid lines; otherwise performance may be reduced.

3. Always install a new drier every time the sealed refrigeration system is opened. Do not replace the drier until after all other repair or replacement has been made. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the screw and the solenoid.

5) Disconnect the valve body. Remove the strainer and check valve.

6) Place the new valve and strainer in position.

7) Remove the drier, then place the new drier in position (located in the icemaker). Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

8) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

CAUTION

Always protect the valve body by using a damp cloth to prevent the valve from overheating. Do not braze with the valve body exceeding 50°F (11°C).

10) Evacuate the system, and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

11) Cut the leads of the solenoid allowing enough lead length to reconnect using closed end connectors.

1) Connect the new solenoid leads.

13) Attach the solenoid to the valve body and secure it with a screw.

14) Replace the panels in their correct positions.

15) Turn on the power supply.

Page 46

4. Removal and Replacement of Headmaster

(Condensing Pressure Regulator - C.P. Regulator)

IMPORTANT

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Before heating, break off the stub on the dome to release the dome charge.

5) Disconnect the headmaster.

6) Place the new headmaster in position.

7) Remove the drier, then place the new drier in position (located in the icemaker). Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

8) Braze all ttings with nitrogen gas owing at a pressure of 3 to 4 PSIG.

CAUTION

Always protect the headmaster body by using a damp cloth to prevent it from overheating. Do not braze with the headmaster body exceeding 50°F (11°C).

10) Evacuate the system and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

11) Replace the panels in their correct positions.

1) Turn on the power supply.

5. Removal and Replacement of Fan Motor

Note: When replacing a fan motor with defective winding, it is recommended that a new

capacitor be installed.

1) Turn off the power supply.

) Remove the panels.

3) Remove the closed end connectors from the fan motor leads.

4) Remove the fan motor bracket and fan motor.

Page 47

5) Install the new fan motor and replace the removed parts in the reverse order of which they were removed.

6) Replace the panels in their correct positions.

7) Turn on the power supply.

C. Icemaker

IMPORTANT

Note: Because the pipes in the evaporator case are specially coated to resist corrosion,

1. Removal and Replacement of Evaporator

1) Turn off the power supply.

) Remove the panels and insulation pieces.

3) Recover the refrigerant and store it in an approved container.

4) Remove the spray tubes and the insulation at the "U" shaped notch where the refrigeration tubing passes through the molded chassis.

5) Disconnect the evaporator tubing.

6) Remove the pop rivets securing the evaporator, then lift out the evaporator.

7) Install the new evaporator.

8) Remove the drier, then place the new drier in position. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

9) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

10) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

11) Evacuate the system, and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

1) Replace the removed parts in the reverse order of which they were removed.

13) Replace the insulation pieces and the panels in their correct positions.

14) Turn on the power supply.

Page 48

2. Removal and Replacement of Expansion Valve

IMPORTANT

1. Sometimes moisture in the refrigerant circuit exceeds the drier capacity and freezes up at the expansion valve. Always install a new drier every time the sealed refrigeration system is opened. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

. It is advisable to change out both expansion valves when replacing an

expansion valve.

3. Connect the expansion valve bulb to the corresponding refrigeration circuit suction line.

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the insulation and the expansion valve bulb on the suction line.

5) Remove the expansion valve cover and disconnect the expansion valve. Place the new expansion valve in position.

6) Remove the drier, then place the new drier in position. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

7) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

WARNING

1. Do not heat the wall of the machine. Place a steel barrier for protection.

. Always protect the valve body by using a damp cloth to prevent the valve

from overheating. Do not braze with the valve body exceeding 50°F (11°C).

8) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with pressurized air for leak testing.

9) Evacuate the system and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

10) Attach the expansion valve bulb to the suction line in the same location as the previous bulb. The bulb should be at the 1 o’clock position on the tube. Be sure to secure the bulb with the clamp and holder and to insulate it.

11) Place the new expansion valve cover in position.

1) Replace the panels in their correct positions.

13) Turn on the power supply.

Page 49

3. Removal and Replacement of Hot Gas Valve and Liquid Line Valve

CAUTION

1. The icemaker unit has 1 hot gas valve and 1 liquid line valve. The hot gas valve has a strainer prior to the valve body. It is advisable to change the strainer and check valves when replacing the hot gas valve.

. Always use a copper tube of the same diameter and length when replacing

the hot gas and liquid lines; otherwise performance may be reduced.

1) Turn off the power supply.

) Remove the panels.

3) Recover the refrigerant and store it in an approved container.

4) Remove the screw and the solenoid.

5) Disconnect the valve body. Remove the strainer and check valve (if applicable).

6) Place the new valve, strainer and check valve in position.

7) Remove the drier, then place the new drier in position. Install the new drier with the arrow on the drier in the direction of the refrigerant ow.

8) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

CAUTION

Always protect the valve body by using a damp cloth to prevent the valve from overheating. Do not braze with the valve body exceeding 50°F (11°C).

10) Evacuate the system, and charge it with refrigerant. See the nameplate on the condensing unit for the required refrigerant charge.

11) Cut the leads of the solenoid allowing enough lead length to reconnect using closed end connectors.

1) Connect the new solenoid leads.

13) Attach the solenoid to the valve body and secure it with a screw.

14) Replace the panels in their correct positions.

15) Turn on the power supply.

Page 50

4. Removal and Replacement of Pump Motor

1) Turn off the power supply.

) Remove the panels.

3) Drain the water tank by removing the insulation panel, front frame and suction hose. (See Fig. 3.)

4) Disconnect the pump suction and discharge hoses.

5) Unplug the water pump connector.

6) Remove the screws and pump motor bracket.

7) Remove the pump housing and check the impeller.

8) If the impeller is defective, install a new impeller.

9) Install the new motor or new parts, and replace the removed parts in the reverse order of which they were removed.

10) Turn on the power supply and check for leaks.

11) Replace the panels in their correct positions.

Thumbscrew

Fig. 3

Suction Hose

Front Frame

5. Removal and Replacement of Fill and Harvest Water Valve

1) Turn off the power supply.

) Close the water supply line shut-off valve.

3) Open the water supply line drain valve and let the water supply line drain.

4) Remove the panels.

5) Remove the valve outlet tubing and tting nut.

6) Disconnect the terminals from the water valve.

7) Remove the bracket and water valve from the unit.

8) Install the new water valve and replace the removed parts in the reverse order of which they were removed.

9) Close the water supply line drain valve.

10) Open the water supply line shut-off valve.

11) Turn on the power supply and check for leaks.

1) Replace the panels in their correct positions.

Page 51

6. Removal and Replacement of Thermistor

CAUTION

1. Fragile, handle very carefully.

. Always use a recommended sealant (high thermal conductive type),

Model KE4560RTV manufactured by SHINETSU SILICONE, Part Code 60Y000-11, or Part Code 4A0683-01 equivalent.

3. Always use a recommended foam insulation (Non-absorbent Type) or equivalent.

4. Do not shorten or cut the thermistor leads when installing.

1) Turn off the power supply.

) Remove the panels.

3) Remove the control box cover.

4) Disconnect the thermistor leads from the K3 connector on the control board.

5) Remove the plastic cable ties, foam insulation, thermistor holder and thermistor.

6) Scrape away the old sealant on the thermistor holder and the suction pipe.

7) Wipe off moisture or condensation on the suction pipe.

8) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or 4A0683-01) to the thermistor holder concave.

9) Attach the new thermistor to the suction pipe in the same position as the previous thermistor. Be very careful to prevent damage to the leads. Secure it using the thermistor holder and recommended foam insulation.

Thermistor Lead Cable Tie

Foam Insulation Thermistor Holder

Fig. 4

10) Secure the insulation using plastic cable ties.

11) Connect the thermistor leads through the bushing of the control box to the K3 connector on the control board. Note: Do not shorten or cut the thermistor leads.

1) Replace the control box cover and the panels in their correct positions.

13) Turn on the power supply.

Page 52

VI. Cleaning and Maintenance

IMPORTANT

Ensure all components, fasteners, and thumbscrews are securely in place after any cleaning or maintenance is done to the equipment.

A. Cleaning and Sanitizing Instructions

HOSHIZAKI recommends cleaning this unit at least once a year. More frequent cleaning, however, may be required in some existing water conditions.

WARNING

1. To prevent injury to individuals and damage to the icemaker, do not use ammonia type cleaners.

. Always wear liquid-proof gloves to prevent the cleaning and sanitizing

solutions from coming into contact with skin.

3. Carefully follow any instructions provided with the bottles of cleaning and sanitizing solution.

4. Never run the icemaker when the water tank is empty.

1. Cleaning Procedure

1) Dilute  . oz. (650 ml) of the recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) with 4 gal. (15 l) of warm water.

) Remove all ice from the evaporator and the dispenser unit/storage bin.

Note: To remove cubes on the evaporator, turn off the power supply and turn it on

after 3 minutes. The harvest cycle starts and the cubes will be removed from the evaporator.

3) Turn off the power supply. Remove the front panel.

4) Place the control switch in the "SERVICE" position. Then place the service switch in the "DRAIN" position.

5) Replace the front panel and turn on the power supply for  minutes.

6) Turn off the power supply.

7) Remove the front panel.

8) In bad or severe water conditions, clean the oat switch as described below. Otherwise, continue to step 9.

a. Remove the right-side panel. b. Disconnect the vent tube from the top of the oat switch, then remove the oat switch

and rubber boot.

c. Twist the wire stem on top of the oat switch housing to release the oat assembly,

then lower it out of the housing.

d. Wipe down the oat switch housing, shaft, and oat with cleaning solution. Clean the

inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water.

5

Page 53

e. Reassemble the oat switch. Replace the rubber boot and the oat switch in their

correct positions. Reconnect the vent tube.

f. Replace the right-side panel in its correct position.

9) Remove the insulation panel by removing the thumbscrews, then pour the cleaning solution into the water tank.

10) Move the service switch to the "WASH" position.

11) Replace the insulation panel and the front panel in their correct positions.

1) Turn on the power supply to start the washing process.

13) Turn off the power supply after 30 minutes. Remove the front panel.

14) Move the service switch to the "DRAIN" position.

15) Replace the front panel and turn on the power supply for  minutes.

16) Turn off the power supply and remove the front panel.

17) Move the control switch to the "ICE" position.

18) Replace the front panel in its correct position.

19) Turn on the power supply to ll the water tank with water.

0) Turn off the power supply after 3 minutes.

1) Remove the front panel.

) Move the control switch to the "SERVICE" position, then move the service switch to the

"WASH" position.

3) Replace the front panel in its correct position.

4) Turn on the power supply to rinse off the cleaning solution.

5) Turn off the power supply after 5 minutes.

6) Remove the front panel.

7) Move the service switch to the "DRAIN" position.

8) Replace the front panel and turn on the power supply for  minutes.

9) Turn off the power supply. Remove the front panel.

30) Repeat steps 17 through 9 three more times to rinse thoroughly. Note: If you do not sanitize the icemaker, go to step 13 in ". Sanitizing Procedure."

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2. Sanitizing Procedure - Following Cleaning Procedure

1) Dilute  . oz. (60 ml or 4 tbs) of a 5.5% sodium hypochlorite solution (chlorine bleach) with 4 gal. (15 l) of warm water.

) Remove the insulation panel if it is in its normal position.

3) Pour the sanitizing solution into the water tank.

4) Move the service switch to the "WASH" position.

5) Replace the insulation panel and the front panel in their correct positions.

6) Turn on the power supply to start the sanitizing process.

7) Turn off the power supply after 15 minutes. Remove the front panel.

8) Move the service switch to the "DRAIN" position.

9) Replace the front panel and turn on the power supply for  minutes.

10) Turn off the power supply. Remove the front panel.

11) Repeat steps 17 through 9 in "1. Cleaning Procedure" two times to rinse thoroughly.

1) Repeat steps 1 through 11 above one more time.

13) Move the control switch to the "ICE" position.

14) Replace the front panel in its correct position.

15) Clean the dispenser unit/storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

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

B. Maintenance

IMPORTANT

This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker.

1. Stainless Steel Exterior

To prevent corrosion, wipe the exterior occasionally with a clean and soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up.

2. Dispenser Unit/Storage Bin and Scoop

• Wash your hands before removing ice. Use the plastic scoop provided (bin accessory).

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

dispenser unit/storage bin.

• Clean the scoop and the dispenser unit/storage bin liner using a neutral cleaner. Rinse

thoroughly after cleaning.

3. Condenser

Check the condenser once a year, and clean if required by using a brush or vacuum cleaner. More frequent cleaning may be required depending on location.

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C. Preparing the Icemaker for Long Storage

CAUTION

When shutting off the icemaker for an extended time, drain out all water from the water tank and remove the ice from the dispenser unit/storage bin. The dispenser unit/storage bin should be cleaned and dried. Drain the icemaker to prevent damage to the water supply line at sub-freezing temperatures, using air or carbon dioxide. Shut off the icemaker until the proper ambient temperature is resumed.

When the icemaker is not used for two or three days, it is sufcient to only move the control switch to the "OFF" position, unless the icemaker will be at sub-freezing temperatures.

1. Remove the water from the inlet water supply line: See Fig. 11.

1) Remove the front panel.

) Move the control switch to the "OFF" position. Conrm that the service switch is in the

"CIRC" position.

3) Remove the front insulation, front frame, right side panel, and control box cover.

4) Disconnect the thermistor from the K3 connector on the control board, and unplug the water pump connector at the water pump.

5) Wait 3 minutes, then move the control switch to the "ICE" position. Conrm that the bin control switch is closed and calling for ice. The green BC CLOSED LED on the control board should be on.

6) Once LED 1 and  on the control board energize (the order of the LEDs from the outer edge of the control board is 1,4,3,), close the inlet water supply line shut-off valve and open the inlet water supply line drain valve. Allow the line to drain by gravity.

7) Disconnect the harvest water valve hose in the evaporator section and blow out the water line to the harvest water valve using compressed air or carbon dioxide. This will clear water from the harvest water valve.

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

9) Move the service switch to the "WASH" position and the control switch to the "SERVICE" position.

10) Using the same hose as with the harvest water valve, blow out the wash valve using compressed air or carbon dioxide.

11) Move the service switch to the "CIRC" position and the control switch to the "OFF" position.

1) Remove the 4 hoses connected to the water tank. Allow the tank and hoses to

completely drain.

13) Move the control switch to the "ICE" position.

14) Using the ll water valve hose, blow the water line out using compressed air or carbon dioxide. This will clear water from the ll water valve.

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

16) Disconnect the oat switch vent hose from the drain hose tee. Move the service switch to the "DRAIN" position and the control switch to the "SERVICE" position.

17) From the tee on the drain hose, blow the drain water valve out using compressed air or carbon dioxide.

18) Move the service switch to the "CIRC" position and the control switch to the "OFF" position.

19) Reconnect the thermistor to the K3 connector on the control board. Reconnect the water pump connector.

0) Close the inlet water supply line drain valve.

1) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage

bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

) Turn off the power supply.

3) Replace all removed parts and panels in their correct positions.

Harvest Water Valve Hose

Harvest Water Valve

Wash Valve

Fill Water Valve

Fill Water Valve Hose

Drain Water Valve

Suction Hose

Fig. 5

Float Switch Vent Hose

Drain Hose Tee