Hoshizaki · SERVICE MANUAL ™ 2 IMPORTANT Only ... f) Shutdown ... EXTERIOR DIMENSIONS (WxDxH) KMS-1401MLH: 30"x24"x28" (762 x 610 x 711 mm) SRK-14H: 50"x17"x28" (1270 x 432 x 711

Hoshizaki

“A Superior Degree of Reliability”

www.hoshizaki.com

Model KMS-1401MLH

IncludingCondensing Unit Models SRK-14H/3

Modular Crescent Cuber Serenity Series

Hoshizaki America, Inc.

Number: 73176Issued: 4-20-2011

SERVICE MANUAL

™

2

IMPORTANTOnly qualified 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 qualified 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.6Highway 74 SouthPeachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Phone: 1-800-233-1940 Technical Service (770) 487-2331Fax: 1-800-843-1056 (770) 487-3360E-mail: [email protected]

Web Site: www.hoshizaki.com

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

•ModelNumber________________________

•SerialNumber________________________

•Completeanddetailedexplanationoftheproblem.

3

CONTENTSImportant Safety Information ................................................................................................. 5I. Specifications ...................................................................................................................... 7

A. Icemaker ....................................................................................................................... 71. KMS-1401MLH with SRK-14H ................................................................................. 72. KMS-1401MLH with SRK-14H3 .............................................................................. 8

B. Condensing Unit ............................................................................................................ 91. SRK-14H .................................................................................................................. 92. SRK-14H3 ............................................................................................................. 10

C. Condensing Unit Dimensions .......................................................................................11II. General Information ......................................................................................................... 12

A. Construction ............................................................................................................... 121. Icemaker ............................................................................................................... 122. Condensing Unit ................................................................................................... 13

B. Sequence of Operation ............................................................................................... 141. Sequence Cycles and Shutdown ........................................................................... 14

a) 1-Minute Fill Cycle ............................................................................................ 14b) Initial Harvest Cycle ........................................................................................ 14c) Freeze Cycle ................................................................................................... 14d) Pump-Out Cycle ............................................................................................... 15e) Harvest Cycle .................................................................................................. 15 f) Shutdown ......................................................................................................... 15

2. Sequence Flow Chart ............................................................................................ 16C. Control Board .............................................................................................................. 17

1. Control Board Layout ............................................................................................. 182. LED Lights and Audible Alarm Safeties ................................................................. 193. Controls and Adjustments ...................................................................................... 20

a) Default Dip Switch Settings .............................................................................. 20b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 20c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................. 21d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 21e) Harvest Pump Timer (S4 dip switch 7) ............................................................. 22f) Factory Use (S4 dip switch 8) ........................................................................... 22g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 22h) Float Switch Control (S5 dip switch 1) ............................................................ 23i) Refill Counter (S5 dip switch 2 through 5) ......................................................... 23

IMPORTANTThis manual should be read carefully before the icemaker is serviced ormaintenance operations are performed. Only qualified service techniciansshould install, service, and maintain the icemaker. Read the warningscontained in this booklet carefully as they give important information regardingsafety. Please retain this booklet for any further reference that may benecessary.

4

D. Control and Service Switches ..................................................................................... 241. Control Switch ........................................................................................................ 242. Service Switch ....................................................................................................... 24

a) DRAIN .............................................................................................................. 24b) CIRC. ............................................................................................................... 24c) WASH ............................................................................................................... 24

III. Technical Information ...................................................................................................... 25A. Water Circuit and Refrigeration Circuit ........................................................................ 25B. Wiring Diagrams .......................................................................................................... 26

1. KMS-1401MLH with SRK-14H ............................................................................... 262. KMS-1401MLH with SRK-14H3 ............................................................................. 273. Wire Harness Connections .................................................................................... 28

C. Performance Data ....................................................................................................... 291. KMS-1401MLH with SRK-14H ............................................................................... 292. KMS-1401MLH with SRK-14H3 ............................................................................. 30

IV. Service Diagnosis ........................................................................................................... 31A. Diagnostic Procedure .................................................................................................. 31B. Control Board Check ................................................................................................... 35C. Bin Control Check and Cleaning ................................................................................. 36

1. Bin Control Check .................................................................................................. 362. Bin Control Cleaning .............................................................................................. 37

D. Float Switch Check and Cleaning ............................................................................... 381. Float Switch Check ................................................................................................ 382. Float Switch Cleaning ............................................................................................ 39

E. Thermistor Check ........................................................................................................ 40F. Diagnostic Charts ........................................................................................................ 41

1. No Ice Production ................................................................................................... 412. Evaporator is Frozen Up ........................................................................................ 443. Low Ice Production ................................................................................................ 454. Abnormal Ice ......................................................................................................... 455. Other ...................................................................................................................... 45

V. Replacement of Components .......................................................................................... 46A. Service for Refrigerant Lines ....................................................................................... 46

1. Refrigerant Recovery ............................................................................................. 462. Brazing .................................................................................................................. 473. Evacuation and Recharge (R-404A) ...................................................................... 47

B. Important Notes for Component Replacement ............................................................ 49VI. Cleaning and Maintenance ............................................................................................ 50

A. Cleaning and Sanitizing Instructions ........................................................................... 501. Cleaning Procedure ................................................................................................ 502. Sanitizing Procedure - Following Cleaning Procedure ........................................... 52

B. Maintenance ................................................................................................................ 52C. Preparing the Icemaker for Long Storage ................................................................... 53

5

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

WARNING Indicates a hazardous situation which could result in death or serious injury.

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

IMPORTANT Indicates important information about the use and care of the unit.

WARNINGThis icemaker should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use.To reduce the risk of death, electric shock, serious injury, or fire, follow basic precautions including the following:

•Onlyqualifiedservicetecniciansshouldinstall,service,andmaintaintheicemaker.

•Movethecontrolswitchtothe"OFF"positionandturnoffthepowersupplytothe SRK condensing unit before servicing the KMS or SRK. Place the KMS disconnect (if applicable) in the off position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

•Donotmakeanyalterationstotheunit.Alterationscouldresultinelectricshock, injury, fire, or damage to the unit.

For KMS

•PowersupplyandgroundconnectionaresuppliedfromtheSRKremotecondensing unit via the wire harness provided. Do not connect the wire harness leads to an external power source.

•Wireharnessrouting(conduit)anddisconnect(ifrequired)mustmeetnational, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or severe damage to equipment.

•THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker could result in death, serious injury, or severe damage to equipment.

6

For SRK

•Electricalconnectionmustbehard-wiredandmustmeetnational,state,andlocal electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or severe damage to equipment.

•Theremotecondensingunitrequiresanindependentpowersupplyofpropercapacity. See the nameplate for electrical specifications. Failure to use a properly sized breaker or fuse can result in a tripped breaker, blown fuses, or damage to existing wiring. This could lead to heat generation or fire.

•THE REMOTE CONDENSING UNIT MUST BE GROUNDED. Failure to properly ground the remote condensing unit could result in death or serious injury.

7

I. Specifications

A. Icemaker

1. KMS-1401MLH with SRK-14H

Note: We reserve the right to make changes in specifications and design without prior notice.

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-14H via Factory SuppliedWire Harness

AMPERAGE 15.3 A (5 Min. Freeze AT 104°F/WT 80°F)MINIMUM CIRCUIT AMPACITY 20 AMAXIMUM FUSE SIZE 20 AAPPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1311 (595) 1278 (580) 1194 (542) Reference without *marks 80 1286 (583) 1236 (560) 1129 (512)

90 1278 (580) *1200 (544) 1101 (499)100 1248 (566) 1177 (534) 1010 (458)

SHAPE OF ICE Crescent CubeICE PRODUCTION PER CYCLE 26 lbs. (11.9 kg) 1248pcs.APPROXIMATE STORAGE CAPACITY N/AELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2630(5.25) 2400(4.40) WATER gal./24HR (gal./100 lbs.) 294(24.5) 644(49.1)CEC/CEE TIER LEVEL 1ENERGY STAR NOEXTERIOR DIMENSIONS (WxDxH) KMS-1401MLH: 30"x24"x28" (762 x 610 x 711 mm)

SRK-14H: 50"x17"x28" (1270 x 432 x 711 mm)EXTERIOR FINISH KMS-1401MLH: Stainless Steel, Galvanized Steel (Rear)

SRK-14H: Galvanized SteelWEIGHT KMS-1401MLH: Net 143 lbs. (65 kg), Shipping 177 lbs. (80 kg)

SRK-14H: Net 230 lbs. (104 kg), Shipping 273 lbs. (124 kg)CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS - WATER SUPPLY Inlet 1/2" FPT - DRAIN Outlet 3/4" FPT -CONDENSATION 5/8" OD Tube -REFRIGERATION Suction Line 1-1/16"-12 UNF Fitting (#10 PARKER)

Liquid Line 5/8"-18 UNF Fitting (#6 PARKER)CUBE CONTROL SYSTEM Float SwitchHARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and TimerICE MAKING WATER CONTROL Timer Controlled. Overflow PipeCOOLING WATER CONTROL N/ABIN CONTROL SYSTEM Mechanical Level Switch and TimerCOMPRESSOR Hermetic, Model CS18K6E-PFV CONDENSER Air-Cooled Remote, Condenser Unit SRK-14HEVAPORATOR Vertical type, Stainless Steel and CopperREFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) (160 PSI)REFRIGERANT CHARGE R404A, 16 lb. 5 oz. (7400g)

(Icemaker 0 lbs. 7 oz. Cond. Unit 15 lbs. 14 oz.)DESIGN PRESSURE High 467PSIG, Low 230PSIGP.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )COMPRESSOR PROTECTION Auto-Reset Overload Protector ( Internal )REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Control SwitchLOW WATER PROTECTION Float SwitchACCESSORIES -SUPPLIED N/A -REQUIRED Ice Storage Bin or Dispenser

Condensing Unit: SRK-14HOPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC

AMBIENT TEMP.KMS-1401MLH 45 - 100°FSRK-14H (Outdoor Use) -20 - 122°F

WATER SUPPLY TEMP. 45 - 90°FWATER SUPPLY PRESSURE 10-113 PSIG

ENG.F-011.1.0205

8

2. KMS-1401MLH with SRK-14H3


AC SUPPLY VOLTAGE 115VAC Supplied by SRK-14H via Factory SuppliedWire Harness

AMPERAGE 13.8 A ( 5 Min. Freeze AT 104°F / WT 80°F)MINIMUM CIRCUIT AMPACITY 20 AMAXIMUM FUSE SIZE 20 AAPPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)PER 24 HR. Temp.(°F) 50 70 90 lbs./day ( kg/day ) 70 *1305 (592) 1265 (574) 1178 (534) Reference without *marks 80 1275 (578) 1213 (550) 1107 (502)

90 1265 (574) *1170 (531) 1069 (485)100 1237 (561) 1146 (520) 977 (443)

SHAPE OF ICE Crescent CubeICE PRODUCTION PER CYCLE 25 lbs. (11.3 kg) 1248pcs.APPROXIMATE STORAGE CAPACITY N/AELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 2440(5.00) 2230(4.10) WATER gal./24HR (gal./100 lbs.) 310(26.5) 676(51.8)CEC/CEE TIER LEVEL 1ENERGY STAR NOEXTERIOR DIMENSIONS (WxDxH) KMS-1401MLH: 30"x24"x28" (762 x 610 x 711 mm)

SRK-14H3: 50"x17"x28" (1270x432x711 mm)EXTERIOR FINISH KMS-1401MLH: Stainless Steel, Galvanized Steel (Rear)

SRK-14H3: Galvanized SteelWEIGHT KMS-1401MLH: Net 143 lbs. (65 kg), Shipping 177 lbs. (80 kg)

SRK-14H3: Net 230 lbs. (104 kg), Shipping 273 lbs. (124 kg)CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS - WATER SUPPLY Inlet 1/2" FPT - DRAIN Outlet 3/4" FPT -CONDENSATION 5/8" OD Tube - REFRIGERATION Suction Line 1-1/16"-12 UNF Fitting (#10 PARKER)

Liquid Line 5/8"-18 UNF Fitting (#6 PARKER)CUBE CONTROL SYSTEM Float SwitchHARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and TimerICE MAKING WATER CONTROL Timer Controlled. Overflow PipeCOOLING WATER CONTROL N/ABIN CONTROL SYSTEM Mechanical Level Switch and TimerCOMPRESSOR Hermetic, Model CS18K6E-TF5 CONDENSER Air-Cooled Remote, Condenser Unit SRK-14H3EVAPORATOR Vertical type, Stainless Steel and CopperREFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) (160 PSI)REFRIGERANT CHARGE R404A, 16 lb. 5 oz. (7400g)

(Icemaker 0 lbs. 7 oz. Cond. Unit 15 lbs. 14 oz.)DESIGN PRESSURE High 467PSIG, Low 230PSIGP.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )COMPRESSOR PROTECTION Auto-Reset Overload Protector ( Internal )REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Control SwitchLOW WATER PROTECTION Float SwitchACCESSORIES -SUPPLIED N/A -REQUIRED Ice Storage Bin or Dispenser

Condensing Unit: SRK-14H3OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC

AMBIENT TEMP.KMS-1401MLH 45 - 100°FSRK-14H3 (Outdoor Use) -20 - 122°F

WATER SUPPLY TEMP. 45 - 90°FWATER SUPPLY PRESSURE 10 - 113 PSIG

ENG.F-011.1.0205

9

B. Condensing Unit

1. SRK-14H


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

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 15.3 A (5 Min. Freeze AT 104°F/WT 80°F)

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS (WxDxH) 50"x17"x28" (1270x432x711 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 52-3/8"x19-1/2"x43" (1330x495x1092 mm)

EXTERIOR FINISH Galvanized steel

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

CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

SRK to KMS: Wire Harness Connection

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

Suction line 1-1/8-12 UNF Fitting (#11 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 Switch

REFRIGERANT CONTROL Headmaster (C.P.R.) (160 PSI)

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

(Condensing Unit: 15 lb. 14 oz.) (7200 g)

(Icemaker: 0 lb. 7.0 oz.) (200 g)

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC

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

-REQUIRED Compatible KMS Icemaker

ENG.F-032.1.0205

10

2. SRK-14H3


AC SUPPLY VOLTAGE 208-230/60/3

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 13.8 A (5 Min. Freeze AT 104°F / WT 80°F)

MINIMUM CIRCUIT AMPACITY 20 A

MAXIMUM FUSE SIZE 20 A

EXTERIOR DIMENSIONS (WxDxH) 50"x17"x28" (1270x432x711 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 52-3/8"x19-1/2"x43" (1330x495x1092 mm)

EXTERIOR FINISH Galvanized steel

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

CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

SRK to KMS: Wire Harness Connection

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

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

COMPRESSOR Hermetic, Model CS18K6E-TF5

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 Switch

REFRIGERANT CONTROL Headmaster (C.P.R.) (160 PSI)

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

(Condensing Unit: 15 lb. 14 oz.) (7200 g)

(Icemaker: 0 lb. 7.0 oz.) (200 g)

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC

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

-REQUIRED Compatible KMS Icemaker

ENG.F-032.1.0205

11

C. Condensing Unit Dimensions

SRK-14H/3U

nit:

mm

[in.

]

Not

e: L

egs

are

incl

uded

with

con

dens

er u

nit.

Leg

heig

ht is

380

mm

(14

.96

in.)

.

12

II. General Information

A. Construction

1. Icemaker

Spray Tubes Hot Gas Valve

Liquid Line Valve

Service Valve(High Side)

Drier

Wash Valve

Service Valve(Low Side)

Fill Water Valve

Control Board

Pump Motor

Float Switch

Drain Water Valve

Control Switch

Bin Control

Service Switch

Harvest Water Valve

Thermistor

Control Box

13

2. Condensing Unit

Condenser

Headmaster (C.P. Regulator)

Hot Gas Valve

Liquid Line Valve

Junction Box

Receiver

Accumulator

Shut-off Valve(Low Side)

Thermostat (Discharge Pipe)

Compressor

Shut-off Valve (High Side)

Fan Motor and Fan Blade

Control Box

14

B. Sequence of Operation

1. Sequence Cycles and ShutdownThe steps in the sequence are as outlined below. When power is supplied, the red "POWEROK"LEDandthegreen"BCCLOSED"LEDontheCBturnon(Ifyellow"BCOPEN"LEDison,theunitwillnotstart.InthiscasecleariceawayfromBCactuatorpaddle in the storage bin area). A 5-second delay occurs at startup. Note that the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.

a) 1-Minute Fill CycleLED 4 is on. WV1 opens and the fill period begins. After 1-minute, CB checks for closed LF/S. If LF/S is closed, the harvest cycle begins. If not, WV1 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.

b) Initial Harvest Cycle LEDs 1, 4 and 2 are on. Comp, FMRs, HGVs, X10 relay, WV2, X12, and X13 relays energize. WV1 de-energizes. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the adjustable harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 seconds. The harvest timer is active only during the initial harvest cycle.The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5 & 6). WV2 and X12 relay are energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. 50 seconds before the harvest timer terminates, harvest pump timer starts. LED 4 turns off, WV2 and X12 relay de-energize.

Harvest Pump Timer: LEDs 1, 3, and 2 are on. Comp, FMRs, HGVs, and X10 relay continue. LED 4 turns off, WV2 and X12 relay de-energize. LED 3 turns on and X11 relay energizes, allowing PM to energize for the last 50 seconds of harvest. CAUTION! S4 dip switch 7 must remain in the factory default position of 7 on. Otherwise, PM will not energize during the last 50 seconds of harvest. The minimum total time allowed by CB for a complete harvest cycle is 2 minutes. At the end of harvest, CB checks position of LF/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.

c) Freeze Cycle LED 1 is on. Comp, FMRs, and PM remain energized. LLVs energize, HGVs, X10, X11, and X13 relays de-energize. For the first 5 minutes, CB will not terminate the freeze cycle. At the end of 5 minutes, F/S assumes control of the freeze cycle. As ice builds on the evaporator, the water level in the tank lowers. LF/S opens and refill starts. LED 4 comes on and WV1 energizes. Refill continues until U/FS closes or 60-second timer terminates, whichever is shorter. 3 seconds after UF/S closes, LED 4 turns off and WV1 de-energizes. The KMS-1401MLH refills 1 time. After refill, freeze continues until LF/S opens again, provided the 5-minute minimum freeze timer has terminated.

15

d) Pump-Out CycleLEDs 1, 3, and 2 are on. Comp and FMRs remain energized, HGVs and X10 relay energize. LLVs de-energize. PM stops for 2 seconds, then X11 relay energizes, allowing PM and DV to energize for 10 or 20 seconds (S4 dip switch 3 & 4). Water is removed from the bottom of the tank and sent down the drain. At the same time, water flows through the small F/S tube to power flush F/S. When the pump-out timer terminates, pump-out is complete.

The first pump-out occurs after the 2nd freeze cycle, then every cycle thereafter. The pump-out frequency control is factory set, and generally no adjustment is required. The pump-out frequency control (S4 dip switch 5 & 6) can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. Timing of the first pump-out is dependent on S4 dip switch 5 & 6 settings. See the table below.

S4 Dip Switch Setting Pump-Out Frequency

1st Pump-OutNo. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

e) Harvest Cycle LEDs 1, 4 and 2 are on.Sameastheinitialharvestcycle.See"II.B.1.b)InitialHarvestCycle."

Note: Unit continues to cycle until BC is satisfied or power is turned off. The unit always restarts at the 1-minute fill cycle.

f) ShutdownWhenBCisactivated(BCopen),theyellow"BCOPEN"LEDcomeson.Theunitthenshuts down as outlined in the table below.

Cycle at Bin Control Activation

Shutdown

Fill Cycle 15 seconds after activation.

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

Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.

Legend: CB–control board; Comp–compressor; DV–drain valve; FMRs –fan motors-remote; F/S–float switch; HGVs–hot gas valves; LF/S–lower float switch contacts; LLVs–liquid line valves; PM–pump motor; UF/S–upper float switch contacts; WV1–fill/re-fill water valve; WV2–harvest water valve

16

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17

C. Control Board•A Hoshizaki exclusive control board is employed in the KMS-1401MLH Modular

Crescent Cuber.

•All models are pretested and factory-adjusted.

•Foracontrolboardcheckprocedure,see"IV.B.ControlBoardCheck."

CAUTION1. Fragile, handle very carefully.

2. 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, bin control, and float switch.

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

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

18

1. Control Board Layout

"G" Control BoardPart Number 2A3792-01

"G" Control Board

• Power LED (red)(lights when 10.5V is supplied to K2 connector)

• LED 3 (X3 Relay) LED 3 on: K1 Connector Pin #5 (energized during harvest pump timer) LED 3 off: K1 Connector Pin #4 (energized in freeze)

• LED 4 (X4 Relay) K1 Connector Pin #6

• LED 1 (X1 Relay)K1 Connector Pin #1, #9

• K2 Connector Control Transformer (10.5VAC)

• S5 Dip Switch(factory set for 1 refill- do not adjust)

• Bin Control Switch Closed LED (green)

• "ALARM RESET" Button • S4 Dip Switch • "OUTPUT TEST" Button(used to test relays on control board)

• WHITE K3 ConnectorHarvest Control (thermistor)

• RED K4 ConnectorBin Control

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

• BLACK K5 ConnectorFloat Switch

• Part Number

• Bin Control Switch Open LED (yellow)

• Alarm Buzzer

• LED 2 (X2 Relay)LED 2 ON: K1 Connector Pin #2LED 2 OFF: K1 Connector Pin #3

• Relay LEDs (4) (indicate which relays are energized and which K1 connector pins are energized

• K1 Ten-Pin ConnectorPins #1 through #10#1, 9-LED 1: Magnetic Contactor, X13 Relay (holding circuit during Harvest Pump Timer), and Drain Valve (DV) (during Pump-Out) #2-LED 2 on: Hot Gas Valves (HGVs) (KMS and SRK) and X10 Relay #3-LED 2 off: Liquid Line Valves (LLVs)#4-LED 3 off: Pump Motor (PM) (freeze)#5-LED 3 on: X11 Relay (Pump Motor (PM) in Harvest Pump Timer and Drain Valve (DV) in Pump-Out)#6-LED 4: Fill/Refill Water Valve (W1V) (Fill and Refill only) and Harvest Water Valve (WV2) and X12 Relay (Harvest only)#7, 10 Supply Voltage#8 Open

19

2. LED Lights and Audible Alarm SafetiesAt startup, a 5-second delay occurs while the control board conducts an internal timer check.Abeepoccurswhenthecontrolswitchismovedtothe"ICE"position.TheredLED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control boardis1,4,3,2.Fordetails,see"II.B.SequenceofOperation."

Sequence Step LEDEnergized

ComponentsTime LEDs are On

Min. Max. Avg.1-Minute Fill Cycle 4 WV1 1 minute

Harvest Cycle 1, 4, 2 Comp, FMRs WV2, HGVs

2 minutes 20 minutes 3 to 5 minutes

Harvest Pump Timer 1, 3, 2 Comp, FMRs, PM, HGVs

0 seconds 50 seconds harvest pump timer setting

Freeze Cycle 1 (and 4 at refill)

Comp, FMRs, PM, LLVs (WV1 at refill)

5 minutes freeze timersetting

30 to 35 minutes

Pump-Out Cycle 1, 3, 2 Comp, FMRs, PM, HGVs, DV

10 seconds 20 seconds

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

No. of Beeps (every 3 sec.)

Type of Alarm Notes

1 High Evaporator Temp. (temperature > 127°F) (53°C)

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

2 Harvest Backup Timer (harvest > 20 min. for two cycles in a row)

Check for open thermistor, HGVs not opening, TXVs or LLVs leaking by, low charge, or inefficient Comp.

3 Freeze Timer (freeze > specified setting for two cycles in a row)Timer is factory set using S4 dip switch 9 & 10

Check for a F/S stuck closed (up), WV1 or WV2 leaking by, HGVs leaking by, PM not pumping, TXVs not feeding properly, LLVs not opening, low charge, HM not bypassing, or inefficient compressor.

Toresettheabovesafeties,pressthe"ALARMRESET"buttonwiththepowersupplyon.

6 Low Voltage (92Vac ±5% or less)

Red LED will turn off if voltage protection operates. The control voltage safeties automatically reset when voltage is corrected.7 High Voltage

(147Vac ±5% or more)Legend: Comp–compressor; DV–drain valve; FMRs–fan motors-remote; F/S–float switch; HGVs–hot gas valves; HM–headmaster (C.P.R.); LLVs–liquid line valves; PM–pump motor; TXVs–thermostatic expansion

valves; WV1–fill/refill water valve; WV2–harvest

20

3. Controls and AdjustmentsCAUTION

Dip switches are factory set. Failure to maintain factory settings may adverselyaffect performance and warranty coverage. For more information, contactHoshizaki Technical Support at 1-800-233-1940.

a) Default Dip Switch SettingsThe dip switches are factory-adjusted to the following positions:

S4 Dip Switch

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

KMS-1401MLH OFF OFF OFF ON OFF OFF ON OFF OFF ON

S5 Dip Switch (Do Not Adjust)

Dip Switch No. 1 2 3 4 5

KMS-1401MLH OFF ON OFF OFF OFF

b) Harvest Timer (S4 dip switch 1 & 2)Initial Harvest Cycle: The harvest timer starts counting when the thermistor reads 48°F (9°C) at the evaporator outlet and the control board reads the thermistor's 3.9 kΩ signal. The harvest timer is factory set, and generally no adjustment is required.

Normal Harvest Cycle: This unit has a pump-out every cycle. The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out. For details,see"II.C.3.c)Pump-OutTimer(S4dipswitch3&4)."

Dip Switch SettingTime (seconds)

No. 1 No. 2

OFF OFF 60

ON OFF 90

OFF ON 120

ON ON 180

S4 Dip Switch Freeze Timer (9 & 10)

Pump-Out Frequency Control (5 & 6)

Pump-Out Timer (3 & 4)

Harvest Timer (1 & 2)

Factory Use (8)

Harvest Pump Timer (7) (Do not adjust)

21

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

The 1st pump-out occurs after the 2nd freeze cycle and every cycle thereafter. When a pump-out is called for, the X10 relay is energized and the X13 relay is de-energized to allow the drain valve to energize. The pump motor stops for 2 seconds, then the X11 relay energizes, allowing the pump motor and drain valve to enegize. Water is removed from the bottom of the tank and sent down the drain. At the same time, water flows through the small float switch tube to power flush the float switch. The pump-out drains the water tank for the time determined by the pump-out timer. The pump-out timer also acts in place of the harvest timer during cycles with a pump-out. The pump-out timer is factory set, do not adjust.

S4 Dip Switch Setting Time (seconds) Inlet Water Valve

No. 3 No. 4 T1 T2

OFF OFF 10 150 closed

ON OFF 10 180 closed

OFF ON 10 120 open if refill = 0; closed if refill 1 or greater

ON ON 20 180 closed

T1: Time to drain the water tankT2: Harvest timer at pump-out

d) Pump-Out Frequency Control (S4 dip switch 5 & 6)The pump-out frequency control is factory-adjusted to drain the water tank every cycle. The first pump-out occurs after the 2nd freeze cycle, then every cycle thereafter. The pump-out frequency control is factory set, and generally no adjustment is required. The pump-out frequency control (S4 dip switch 5 & 6) can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. Timing of the first pump-out is dependent on S4 dip switch 5 & 6 settings. See the table below.

S4 Dip Switch Setting Pump-Out Frequency

1st Pump-OutNo. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

22

e) Harvest Pump Timer (S4 dip switch 7)

CAUTIONFactory set for proper operation. Do not adjust. Adjustment outside of the factory default setting may result in damage to the icemaker.

Depending on the harvest pump timer setting, the pump motor energizes and runs the last 0 or 50 seconds of harvest. When the pump motor is on, water circulates over the evaporator. The water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 0 or 50 seconds (determined by the harvest pump timer setting), whichever is shorter. When S4 dip switch 7 is in the on position and harvest begins, X10 relay energizes and allows WV2 (harvest water valve), X12, and X13 relays to energize. A lockout circuit is created using the X10, X12, and X13 relays. This prevents the drain valve from energizing duringharvestpumptimer.See"III.B.WiringDiagram."50 seconds before harvest termination, LED 4 goes off de-energizing WV2 (havest water valve) and X12 relay. X13 relay remains energized through the holding circuit allowed through X10 and X13 relays. Next, LED 3 on the control board turns on and X11 relay energizes, allowing the pump motor to energize. The pump motor runs the last 50 seconds of harvest.

S4 Dip Switch Setting Pump Motor Time (seconds)No. 7

ON 50

OFF 0

f) Factory Use (S4 dip switch 8)Factory set for proper operation. Do not adjust. This must be left in the factory default position.

g) Freeze Timer (S4 dip switch 9 & 10)CAUTION

Adjust to proper specification, 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 2 consecutive freeze timer terminations, the control board shuts down the icemaker.Inthiscase,see"IV.F.3.LowIceProduction"forpossiblesolutions.The freeze timer is factory set, and generally no adjustment is required. Before changingthis setting, contact your local Hoshizaki distributor or Hoshizaki Technical Support forrecommendations.

Dip Switch Setting Time (minutes)No. 9 No. 10

OFF OFF 60

OFF ON 50

ON OFF 70

ON ON 60

23

h) Float Switch Control (S5 dip switch 1)

CAUTIONDo not adjust. This must be left in the factory default position or the unit will notoperate correctly.

Factory set. S5 dip switch 1 allows for single or double float switch applications. The KMS-1401MLH uses a double float switch.

S5 Dip Switch Setting Single or Double Float Switch ApplicationNo. 1

OFF Single

ON Double

i) Refill Counter (S5 dip switch 2 through 5)

CAUTIONDo not adjust. These must be left in the factory default position or the unit will not operate correctly.

Factory set. S5 dip switch 2 through 5 allows for refills during the freeze cycle.The KMS-1401MLH is factory set for 1 refill. Do not adjust.

S5 2-5 Dip Switch SettingsNo. of Refills

No. 2 No. 3 No.4 No. 5

ON OFF OFF OFF 1 Refill

Note: When refill set > 0, water valve is off during pump-out even if S4 dip switch 3 & 4 aresetto3offand4on.See"II.C.3.c)Pump-outTimer(S4dipswitch3&4)."

24

D. Control and Service Switches2 control switches are used to control the operation of this unit. These switches are referred to as control switch and service switch. They are located on the control box.

1. Control SwitchThecontrolswitchhasthreepositions:"OFF"forpoweroff;"ICE"foricemaking,and"SERVICE"toactivatetheserviceswitch.

2. Service SwitchWhenthecontrolswitchisinthe"SERVICE"position,thecontrolswitchsuppliespowertotheserviceswitch.Theserviceswitchhasthreepositions:"DRAIN,""CIRC."and"WASH."

Note:1.Whentheserviceswitchisactive(controlswitchinthe"SERVICE"position),power

is supplied to the water pump in all three positions.2.Whenthecontrolswitchisinthe"OFF"or"ICE"position,theserviceswitchis

de-activated. In this state, it can be left in any position.

a) DRAINThisunitutilizesapump-outdrainsystem.Whenthecontrolswitchisinthe"SERVICE"positionandtheserviceswitchisplacedinthe"DRAIN"position,powerissuppliedtothe water pump and drain valve.

b) CIRC.Whentheserviceswitchisactiveandplacedinthe"CIRC."position,powerissupplied to the water pump only. This water pump operation is used during cleaning to circulate cleaner for extended periods of time over the outside surface of the evaporator.

c) WASHThis unit utilizes a solenoid operated wash (bypass) valve. When the serviceswitchisactiveandplacedinthe"WASH"position,powerissuppliedtothepumpandwash valve. This operation is used to circulate cleaner and sanitizer over both the insideand outside of the evaporator.

25

Spr

ay T

ubeK

MS

-140

1ML

H

Har

vest

W

ater

Val

ve

Wat

er S

uppl

y Was

h V

alve

Line

Val

ve

Drie

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Ser

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Val

veS

trai

ner

Line

Val

ve

Shu

toff

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ve

SR

K-1

4H/3

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Con

dens

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(C.P

. Reg

ulat

or)

Che

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alve

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ve

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The

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III. Technical Information

A. Water Circuit and Refrigeration Circuit

26

B. Wiring Diagrams


* H

igh-

Pre

ssur

e S

witc

h

Cut

-out

426±

22 P

SIG

Cut

-in

341±

22 P

SIG

0

The

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tat S

witc

h

Cut

-out

266°

F±

9°F

(13

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± 5

°C)

Cut

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239°

F±

9°F

(11

5°C

±5°

C)

**

*

**

Con

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Tra

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t 10.

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27


* H

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witc

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Cut

-out

426±

22 P

SIG

Cut

-in

341±

22 P

SIG

0

The

rmos

tat S

witc

h

Cut

-out

266°

F±

9°F

(13

0°C

± 5

°C)

Cut

-in

239°

F±

9°F

(11

5°C

±5°

C)

**

*

**

Con

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Tra

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t 10.

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28

3. Wire Harness Connections

Con

tact

orHG

VLL

V

Neu

tral

Fuse

10A

CB

HG

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V

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SR

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sin

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ire

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s C

on

nec

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ns

BR

VP

BK

W

BR

GR

GN

D

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BK

WG

RB

RV

PB

KW

GR

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BK

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D

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Fuse

10A

29

C. Performance Data


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

should be used for reference only.2. We reserve the right to make changes in specifications and design without prior

notice.

70/21 1311 595 1278 580 1194 54280/27 1286 583 1236 560 1129 51290/32 1278 580 1200 544 1101 499

lbs./day kg./day 100/38 1248 566 1177 534 1010 45870/2180/2790/32

watts 100/3870/21 644 2.44 541 2.05 474 1.7980/27 566 2.14 406 1.54 379 1.4490/32 541 2.05 294 1.11 248 0.94

gal./day m3/day 100/38 418 1.58 283 1.07 206 0.7870/2180/2790/32

min. 100/3870/2180/2790/32

min. 100/3870/21 192 13.5 208 14.6 225 15.880/27 204 14.3 229 16.1 244 17.290/32 208 14.6 246 17.3 263 18.5

PSIG kg/cm2G 100/38 210 14.8 250 17.6 278 19.570/21 40 2.8 41 2.9 43 3.180/27 41 2.9 43 3.1 45 3.290/32 41 2.9 45 3.2 47 3.3

PSIG kg/cm2G 100/38 42 2.9 45 3.2 49 3.4

27,900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

3,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]CONDENSER VOLUME (SRK-14H) 226 CU. IN

25

292626

29

3.52.5

4.8

24

APPROXIMATE WATER CONSUMPTION PER 24 HR.

FREEZING CYCLE TIME

WATER TEMP. (ºF/ºC)AMBIENT TEMP. (ºF/ºC) 50/10 70/21 90/32

2444

2627

240024512467

APPROXIMATE ICE PRODUCTION PER 24 HR.

APPROXIMATE ELECTRIC CONSUMPTION

2467255626302628

2482252726202610

28303133

HARVEST CYCLE TIME

HEAD PRESSURE

4.23.5

4.6 2.42.5

5.5

3.7

4.6

2.3

TOTAL HEAT OF REJECTION FROM CONDENSER (SRK-14H)

SUCTION PRESSURE

TOTAL HEAT OF REJECTION FROM COMPRESSOR (SRK-14H)

ENG.F-011.1.0205

30


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

should be used for reference only.2. We reserve the right to make changes in specifications and design without prior

notice.

70/21 1305 592 1265 574 1178 53480/27 1275 578 1213 550 1107 50290/32 1265 574 1170 531 1069 485

lbs./day kg./day 100/38 1237 561 1146 520 977 44370/2180/2790/32

watts 100/3870/21 676 2.56 569 2.15 495 1.8780/27 594 2.25 428 1.62 394 1.4990/32 569 2.15 310 1.17 258 0.98

gal./day m3/day 100/38 438 1.66 298 1.13 210 0.8070/2180/2790/32

min. 100/3870/2180/2790/32

min. 100/3870/21 180 12.7 198 13.9 218 15.480/27 194 13.6 222 15.6 240 16.990/32 198 13.9 242 17.0 261 18.4

PSIG kg/cm2G 100/38 201 14.1 247 17.3 279 19.670/21 42 3.0 43 3.0 45 3.280/27 43 3.0 45 3.1 47 3.390/32 43 3.0 46 3.2 48 3.4

PSIG kg/cm2G 100/38 44 3.1 46 3.3 50 3.5

28,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

3,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]CONDENSER VOLUME (SRK-14H3) 226 CU. IN

25

292526

28

3.52.7

4.7

24

APPROXIMATE WATER CONSUMPTION PER 24 HR.

FREEZING CYCLE TIME

WATER TEMP. (ºF/ºC)AMBIENT TEMP. (ºF/ºC) 50/10 70/21 90/32

2288

2527

223022772292

APPROXIMATE ICE PRODUCTION PER 24 HR.

APPROXIMATE ELECTRIC CONSUMPTION

2292237324402449

2339239924762510

27293032

HARVEST CYCLE TIME

HEAD PRESSURE

4.13.5

4.5 2.52.6

5.2

3.6

4.5

2.3

TOTAL HEAT OF REJECTION FROM CONDENSER (SRK-14H3)

SUCTION PRESSURE

TOTAL HEAT OF REJECTION FROM COMPRESSOR (SRK-14H3)

ENG.F-011.1.0205

31

IV. Service Diagnosis WARNING

1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.

2. Risk of electric shock. Use extreme caution and exercise safe electrical practices.

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

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

5. Make sure all food zones in the icemaker and dispenser unit/storage bin are cleanaftertheunitisserviced.Forcleaningprocedures,see"VI.CleaningandMaintenance."

A. Diagnostic ProcedureThe diagnostic procedure is basically a sequence check which can be used at unit startup or for system diagnosis. This procedure allows you to diagnose electrical system and component failures. Before conducting the diagnostic procedure, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check CB usingthestepsin"IV.B.ControlBoardCheck."Checkthedipswitchsettingstoassurethat S4 dip switch 3, 4, 7, 8, 9, & 10 and S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, & 6 are cleaning adjustments and the settings are flexible.Forfactorydefaultsettings,see"II.C.3.a)DefaultDipSwitchSettings."Asyougo through the procedure, check to assure the components energize and de-energize correctly. If not, those components and controls are suspect.

1) Turn off the power supply, then access the control box. Clear any ice from BC.

2)Turnonthepowersupply,thenmovethecontrolswitchtothe"ICE"position.A5-seconddelayoccurs.Thered"POWEROK"LEDandthegreen"BCCLOSED"LEDonCBcomeon.Iftheyellow"BCOPEN"LEDison,checkBC.See "IV.C. BinControlCheck."

3) 1-Minute Fill Cycle – LED 4 is on. WV1 energizes. After 1 minute, CB checks for a closed LF/S. If LF/S is closed, the harvest cycle begins. If closed, continue to step 4. If LF/S is open, WV1 remains energized through additional 1-minute fill cycles until water enters the reservoir and LF/S closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: Confirm that water enters the water tank. If not, check that the water supply shut-off valve is open and screens or external filters are clear.ChecksupplyvoltageatWV1solenoid.Ifnovoltageispresent,see"IV.B.ControlBoardCheck."Ifvoltageispresent,checksolenoidcontinuity.Ifthewatertankfills,buttheunitfailstostartharvest,checkforopenLF/S.See"IV.D.1.FloatSwitchCheck."Checkterminationof1-minutetimerinCB.See"IV.B.ControlBoardCheck."

32

4) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. Comp, FMRs, HGVs, X10 relay, WV2, X12, and X13 relays energize. WV1 de-energizes. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 seconds. The harvest timer is active only during the initial harvest cycle. The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5 & 6). WV2 and X12 relay are energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. 50 seconds before the harvest timer terminates, harvest pump timer starts. LED 4 turns off, WV2 and X12 relay de-energize.

Harvest Pump Timer – LEDs 1, 3, and 2 are on. Comp, FMRs, HGVs, and X10 relay continue. LED 4 turns off, WV2 and X12 relay de-energize (CB K1 connector pin #6 (orange (O) wire)). LED 3 turns on and X11 relay energizes (CB K1 connector pin #5 (dark blue (DBu) wire)), allowing PM to energize for the last 50 seconds of harvest (S4 dip switch 7 setting). CAUTION! S4 dip switch 7 must remain in the factory default position of 7 on. Otherwise, PM will not energize during the last 50 seconds of harvest. The minimum total time allowed by CB for a complete harvest cycle is 2 minutes. At the end of harvest, CB checks the position of LF/S and proceeds to the next cycle if it is closed, or calls for a 1-minute fill cycle if it is open.

Diagnosis: Check that evaporator is warming and Comp, FMRs, and HGVs remain energized. WV2 is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds (Harvest Pump Timer (S4 dip switch 7)), whichever is shorter. Average initial harvest cycle at factory setting is 2 to 3 minutes. 1.5 minutes after initial harvest begins, touch Comp discharge line. Is it hot? If not, check that Comp is energized, refrigerant pressures are in range, HGVs are energized and open, LLVs are de-energized and closed. If discharge line is hot, place a thermometer on the suction line next to the thermistor. Has it warmed to 48°F (9°C) or warmer? Confirm thermistor status.See"IV.E.ThermistorCheck."Iftemperaturehasbeenreached,checkthatWV2 de-energizes (LED 4 off) and X11 relay energizes (LED 3 on), allowing PM to energize and circulate water over the evaporator for the last 50 seconds of harvest. If not, make sure CB S4 dip switch 7 is in the factory default position. Check CB K1 connector pin #5 (DBu wire) and X11 relay for 115VAC. If 1-minute fill cycle starts after harvest,see"IV.D.FloatSwitchCheckandCleaning."Ifthethermistorreadingisinproper range and CB fails to terminate the harvest cycle and initiate the freeze cycle, CB is bad and must be replaced.

5) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM remain energized (CB K1 connector pin #5 de-energizes and K1 connector pin #4 energizes to prevent PM interuption). LLVs energize. HGVs, X10, X11, and X13 relays de-energize. Freeze begins and the water level in the water tank lowers as ice forms.

LF/S 1st Activation: Refill – LEDs 1 and 4 are on. Comp, FMRs, LLVs, and PM remain energized. Refill can occur at any time during the freeze cycle (1 refill per cycle). Water level lowers enough for LF/S to open. LED 4 comes on and CB energizes WV1 through X10 relay. LED 4 and WV1 remain energized until UF/S closes or the 1-minute fill timer terminates, whichever comes first.

33

LF/S 2nd Activation: Freeze Termination – LED 1 is on. The unit is held in freeze by a 5-minute short cycle protection timer. When LF/S opens a second time, the freeze cycle terminates. Freeze can only be terminated on the second activation of LF/S and after 5 minutes of freeze.

Diagnosis: Minimum freeze time is 5 minutes. During the first 5 minutes of freeze, confirm that Comp, FMRs, PM, and LLVs are energized and that HGVs, WV2, and WV1 (except during refill) are de-energized and not bypassing. The evaporator temperature should be dropping. Make sure TXVs and HM are operating properly. Check that DV is not leaking by (water flowing down the potable drain). Check for proper unit pressures (see"III.C.PerformanceData")oraninoperativeComp.DisconnecttheblackK5floatswitch connector from CB. 15 seconds after disconnecting the black K5 F/S connector, LED 4 comes on, WV1 energizes and refill begins. Connect the black K5 F/S connector back on CB. When refill is finished, LED 4 turns off and WV1 de-energizes. Disconnect the black K5 F/S connector again. When 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 F/S connector to CB. If the unit remains in freeze with F/S disconnected,replaceCB.TocheckF/S,see"IV.D.FloatSwitchCheckandCleaning."

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.See"III.C.PerformanceData."

6) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out) – The 1st pump-out occurs after the 2nd freeze cycle and every cycle thereafter. Comp and FMRs remain energized. HGVs and X10 relay energize. LLVs de-energize. PM de-energizes for 2 seconds, then X11 relay energizes, allowing PM and DV to energize for 10 seconds. PM energized through X11 relay (energized) terminal #4 brown (BR) and terminal #6 red (R), then through control switch terminal #6 red (R) and terminal #5 red (R). DV energized through X10 relay (energized) terminal #5 violet (V) and terminal #3 yellow (Y), then through X13 relay (de-energized) terminal #6 yellow (Y) and terminal #2 light blue (LBu), then through X11 relay (energized) terminal #3 light blue (LBu) and terminal #5 gray (GY). This pump-out removes contaminants from the water tank through DV and allows for a power flush of F/S. Diagnosis: PM Operation: If PM does not come on, check CB K1 ten-pin connector pin #5 dark blue (DBu) wire (X11 relay coil voltage) to a white neutral for 115VAC. If LED 3 is on and 115VAC is not present, CB is bad and should be replaced. If 115VAC is present, X11 relay should energize and X11 terminals #4 brown (BR) and #6 red (R) should be closed. Check X11 relay terminal #6 red (R) for 115VAC to a white neutral. If 115VAC is not present, check X11 relay coil and contact continuity. If 115VAC is present and PM is still not energized, check control switch conitinuity between terminal #5 red (R) wire and #6 red (R) wire. If closed, check PM windings and capacitor. DV Operation: If water does not pump out, check CB K1 ten-pin connector pin #1 violet (V) wire (power supply for DV operation) and CB K1 ten-pin connector pin #2 pink (P) wire (X10 relay coil voltage for DV operation) to a white neutral for 115VAC. If 115VAC is not present on either circuit CB is bad and should be replaced. If 115VAC is present, X10 relay terminals #1 yellow (Y) and #5 violet (V) should be closed. Check X10 relay terminal #3 yellow (Y) to a white neutral for 115VAC. If 115VAC is not present on terminal #3 yellow (Y), check X10 relay coil and contact continuity. If 115VAC is present on X10 relay terminal #3 yellow

34

(Y), go to X13 relay and check X13 relay terminal #2 light blue (LBu) to a white nuetral for 115VAC. If 115VAC is not present, check X13 relay contact continuity between terminal #2 light blue (LBu) and terminal #6 yellow (Y). If contacts are open, confirm X13 is de-energized. If 115VAC is present, check X11 relay terminal #5 gray (GY) to a white nuetral for 115VAC. If 115VAC is not present, check continuity between X11 relay (energized) terminal #3 light blue (LBu) and terminal #5 gray (GY). If 115VAC is present on X11 terminal #5 gray (GY), check continuity on DV coil. Next, remove DV housing and check/clean DV assembly, 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 BC is satisfied or power is switched off. The unit

always restarts at the 1-minute fill cycle.

Legend: CB–control board; Comp–compressor; DV–drain valve; FMRs–fan motors-remote; F/S–float switch; HGVs–hot gas valves; HM–headmaster (C.P.R.); LF/S–lower float switch; LLVs–liquid line valves; PM–pump motor; TXVs–thermostatic expansion valves; UF/S–upper float switch; WV1–fill/refill water valve; WV2–harvest water valve; X10–WV1 and WV2 relay; X11–drain valve/harvest pump timer relay; X12–drain valve lockout relay 1; X13–drain valve lockout relay 2

35

B. Control Board CheckBefore replacing CB 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.

AlarmReset:IfCBisinalarm(beeping),pressthe"ALARMRESET"buttononCBwhileCB is beeping. WARNING! Risk of electric shock. Care should be taken not to touch live terminals. Once reset, the unit starts at the 1-minute fill cycle.Foraudiblealarminformation,see"II.C.2.LEDLightsandAudibleAlarmSafeties."

1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10, and S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a)DefaultDipSwitchSettings."

2)Movethecontrolswitchtothe"ICE"position.Ifthered"POWEROK"LEDison,controlvoltageisgood,continuetostep3.Ifthered"POWEROK"LEDisoff,checkCT secondary circuit. CT output is 10.5VAC at 115VAC primary input. If the secondary circuit has proper voltage and the red LED is off, CB is bad and should be replaced.

If the secondary circuit does not have proper voltage, check CT primary circuit. Check for 115VAC at CB K1 ten-pin connector #10 pin (BR wire) to a white neutral wire for 115VAC. (Always choose a white neutral wire to establish a good neutral connection whencheckingvoltages.)Foradditionalchecks,see"IV.F.1.NoIceProduction."

3)The"OUTPUTTEST"buttonprovidesarelaysequencetest.Makesurethecontrolswitchisinthe"ICE"position,thenpressthe"OUTPUTTEST"button.Thecorrectlighting sequence is 1, 4, 3, 2. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) will cycle during the test. Following the test, the icemaker begins operation at the 1-minute fill cycle. If the LEDs do not light as described above, CB is bad and should be replaced.

4) To verify voltage output from CB to the components, slide the CB K1 ten-pin connector out far enough to allow multimeter lead contact. With the unit in the cycle to be tested, check output voltage from the corresponding pin on CB K1 ten-pin connector to ground. If output voltage is not found and the appropriate LED is on, CB is bad and should be replaced.

Legend: CB–control board; CT–control transformer.

36

C. Bin Control Check and CleaningThis unit uses a BC with a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required.

1. Bin Control CheckTo check BC, follow the steps below.

1) Turn off the power supply.

2)Removethefrontpanel,thenmovethecontrolswitchtothe"OFF"position.

3) Remove the top and right side panels. Remove the control box cover, then clear any ice away from BC.

4) Check BC wire harness connections. See Fig. 1.

5) Disconnect the red connector from CB RED K4 connector.

6) Check for continuity across the wires of the red connector. When the actuator paddle is not engaged, BC switch is closed. If open, check that the wire harness connector is properly connected and that the actuator paddle is not sticking. Clean if necessary. See "IV.C.2.BinControlCleaning."IfBCswitchstillreadsopen,replaceBC.

7) Press the actuator paddle, check for continuity across the wires of the red connector. When the actuator paddle is engaged, BC switch is open. If closed, check that the actuatorpaddleisnotrestricted.Cleanifnecessary.See"IV.C.2.BinControlCleaning."If BC switch still reads closed, replace BC.

8) Reconnect the red connector to CB RED K4 connector, then move the control switch to the"ICE"position.Turnonthepowersupply.

9)Checkthatthegreen"BCCLOSED"LEDonCBison.

10)Allowtheunittocycleon.Pressandholdtheactuatorpaddle.Theyellow"BCOPEN"LED should be on and the unit should shut down according to the chart below. If it does not, replace CB.

Cycle at Bin Control Activation

Shutdown

Fill Cycle 15 seconds after activation.

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

Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.

Legend: BC–bin control, CB–control board

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2. Bin Control CleaningScale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In this case, BC should be cleaned.

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


2) Remove the front panel, then move the controlswitchtothe"OFF"position.

3) Remove the top and right side panels. Remove the control box cover, then clear any ice away from BC.

4) Disconnect the red connector from CB RED K4 connector, then remove BC from the unit.

5) Remove the actuator paddle from the switch mount. See Fig. 1.

6) Wipe down BC with a mixture of 1 part Hoshizaki"ScaleAway"and25partswarmwater. Rinse the parts thoroughly with clean water.

7) Reassemble BC and replace it in its correct position.

Note: If the magnet was removed for cleaning, be sure to replace it in its correct position.

8) Reconnect the red connector to CB RED K4 connector.

9)Movethecontrolswitchtothe"ICE"position.

10) Replace the control box cover, right side, top, and front panels in their correct positions.

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

Bin Control Proximity Switch Closed(calling for ice)

Bin Control Proximity Switch Open (bin full, unit off or shutting down)

Fig. 1

Bin Control

To Control Board Red K4 Connector

Actuator Paddle

Proximity Switch

Actuator Paddle

Magnet

Switch Mount

38

D. Float Switch Check and CleaningA dual F/S is used to determine that there is sufficient water in the tank after the 1-minute fill cycle, harvest cycle, and refill. CB monitors LF/S (black and blue wires) during fill for low water safety protection and initiating the harvest cycle and during the freeze cycle for refill, low water safety, and terminating the freeze cycle. CB monitors UF/S (black and red wires) to terminate refill only during the freeze cycle. Refill will last until UF/S closes or the 1-minute countdown timer terminates, whichever comes first.

1. Float Switch CheckTo check F/S, follow the steps below.


2) Remove the front panel.

3)Placethecontrolswitchinthe"SERVICE"position.Thenplacetheserviceswitchinthe"DRAIN"position.

4) Replace the front panel in its correct position, then turn on the power supply for 2 minutes.



7) Remove the top and right side panels.

8) Remove the control box cover, then disconnect the black K5 float switch connector from the control board.

9) With the water tank empty, check continuity of LF/S contacts using the black and dark blue wires and UF/S contacts using the black and red wires. See Fig. 2. If open, continuetostep10.Ifclosed,followthestepsin"IV.D.2.FloatSwitchCleaning."Aftercleaning F/S, check it again. Replace if necessary.

10) Reconnect the black F/S connector to CB BLACK K5 connector, then replace the control box cover, right side, and top panels in their correct positions.

11)Movethecontrolswitchto"ICE"position.Replacethefrontpanel.

12) Turn on the power supply.

13) As water fills the reservoir, F/S contacts should close. After 1 minute, the 1-minute fill cycle should end and the initial harvest cycle should begin.

14) Once the harvest cycle starts, turn off the power supply.


16) Remove the top and right side panels.

17) Remove the control box cover, then disconnect the F/S black K5 connector from CB BLACK K5 connector.

18) With the water tank full, check continuity of LF/S contacts using the black and dark blue wires and UF/S contacts using the black and red wires. If either F/S contacts are open, and F/S assembly has been cleaned, F/S assembly should be replaced. If F/S switch contacts are closed, F/S assembly is good.

39

19) Reconnect the black F/S connector to CB BLACK K5 connector, then replace the control box cover, right side, and top panels in their correct positions.


21) Replace the front panel in its correct position.


2. Float Switch CleaningDepending on local water conditions, scale may build up on F/S. Scale on F/S can cause the float to stick. In this case, F/S should be cleaned.

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

2)Placethecontrolswitchinthe"SERVICE"position.Thenplacetheserviceswitchinthe"DRAIN"position.

3) Replace the front panel and turn on the power supply for 2 minutes.


5)Removethefront,top,andright-sidepanels,thenmovethecontrolswitchtothe"OFF"position.

6) Disconnect the flush tube from F/S, then remove F/S assembly. Remove the rubber boot from the bottom of the assembly.

7) Twist the wire stem on top of F/S housing to release the float, then lower it out of the housing.

8) Remove the retainer clip from the shaft and slide the float off the shaft. Soak the F/S assembly with a mixture of 1 part Hoshizaki "ScaleAway"and25partswarmwater.

9) Wipe down F/S assembly's housing, shaft, float, and retainer clip. Clean the inside of the rubber boot and hose with cleaning solution. Rinse the parts thoroughly with clean water.

10) Reassemble F/S assembly and replace it and the rubber boot in their correct positions. Reconnect the flush tube.

11) Replace the right-side and top panels in their correct positions.


13) Replace the front panel in its correct position.


Legend: CB–control board, F/S–float switch, LF/S–lower float switch, UF/S–upper float switch

Red - Upper Switch

Black - CommonDark Blue - Lower Switch

Upper Switch

Lower Switch

Float

Retainer Clip

Housing

Wire Stem

Fig. 2

40

E. Thermistor CheckTo check thermistor resistance, follow the steps below.



3) Remove the top and right side panels, then remove the control box cover.

4) Remove the thermistor.

5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes.

6) Disconnect the white thermistor connector from CB WHITE K3 connector and check the resistance between thermistor leads. Normal reading is within 4.7 to 6.2 kΩ. If outside thenormalreading,replacethethermistor.See"V.B.ImportantNotesforComponentReplacement."Ifinsidethenormalreading,continuetothenextstep.

7)Replacethethermistorinitscorrectposition.See"V.B.ImportantNotesforComponentReplacement."

8) Reconnect the white thermistor connector to CB WHITE K3 connector.

9) Replace the control box cover in its correct position, then turn on the power supply.


11) Once the harvest cycle starts, begin timing the harvest cycle.

12) The harvest timer and harvest cycle should terminate within 2 to 5 minutes. If the harvest cycle does not terminate within 2 to 5 minutes, the harvest timer is bad and CB should be replaced.

Legend: CB–control board

41

Problem Possible Cause Remedy

[1] The icemaker will not start.

a) Power Supply (Condensing Unit)

1. Off, blown fuse, or tripped breaker.

1. Turn on, replace, or reset.

2. Loose connections. 2. Tighten.

3. Bad contacts. 3. Check for continuity and replace.

4. Not within specifications.

4. Refer to nameplate and correct.

b) Water Supply 1. Water supply off or pressure too low.

1. Check and get recommended pressure.

c) High Pressure Control 1. Open contacts. 1. Check for continuity, let reset or replace.

2. Dirty condenser coil. 2. Clean.

3. Refrigerant overcharged.

3. Recharge.

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

5. Refrigerant line or components plugged.

5. Clean and replace drier.

d) Thermostat (Condensing Unit High Temperature Safety)

1. Open contacts. 1. Let cool and reset. Check for continuity and replace if open.

e) Wire Harness Terminal Block: Condensing Unit and Icemaker

1. Loose connection. 1. Tighten.

f) Fuse (Icemaker fused disconnect, if any)

1. Blown. 1. Check for short circuit and correct. Reset or replace.

g) Fuse (10A fuse in icemaker)

1. Blown. 1. Check for short circuit and replace.

h) Control Switch 1. "OFF"position. 1. Moveto"ICE"position.

2. Bad contacts. 2. Check for continuity and replace.


i) Transformer 1. Open windings. 1. Replace.

j) Bin Control 1. Tripped with bin filled with ice.

1. Remove ice.

2. Proximity switch stuck open.

2. Replace bin control.

k) Wiring to Control Board 1. Loose connections or open.

1. Check for continuity and replace.

F. Diagnostic Charts

1. No Ice Production

42


[1] The icemaker will not start. (continuted)

l) Fill Water Valve 1. Mesh filter or orifice clogged.

1. Clean.

2. Coil winding opened. 2. Replace.

3. Wiring to water valve. 3. Check for loose connection or open, and replace.

m) Control Board 1. Defective. 1. See"IV.B.ControlBoardCheck."

n) Control Board in Alarm 1. Audible alarm. 1. See"II.C.2.LEDLightsand Audible Alarm Safeties".

[2] Water continues to be supplied, and the icemaker will not start.

a) Float Switch 1. Connector disconnected.

1. Reconnect.

2. Leads opened or defective switch.

2. Check and replace.

3. Float does not move freely.

3. Clean or replace.

b) Control Board 1. Defective. 1. Replace.See"IV.B.ControlBoardCheck."

[3] Compressor will not start or stops operating.

a) Control Switch 1. "SERVICE"position. 1. Moveto"ICE"position.

2. Bad contacts. 2. Check and replace.

b) Control Board 1. Defective. 1. See"IV.B.ControlBoardCheck."

c) Wire Harness Terminal Block: Condensing Unit and Icemaker


d) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and replace.


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


f) Start Capacitor or Run Capacitor

1. Defective. 1. Replace.

g) Overload Protector 1. Bad contacts. 1. Check for continuity and replace.

2. Voltage too low. 2. Increase voltage.

3. Refrigerant overcharged or undercharged.

3. Recharge.

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

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

h) Compressor 1. Wiring to compressor. 1. Check for loose connection or open, and replace.

2. Defective. 2. Replace.

43


[4] Water continues to be supplied in freeze cycle (outside of refill).

a) Fill or Harvest Water Valve

1. Diaphragm does not close.

1. Check for water leaks with icemaker off.

b) Control Board 1. Defective. 1. See"IV.B.ControlBoardCheck."

[5] No water comes from spray tubes. Water pump will not start, or freeze cycle time is too short.

a) Water Supply Line 1. Water pressure too low and water level in water tank too low.

1. Check and get recommended pressure.

b) Fill or Harvest Water Valve

1. Dirty mesh filter or orifice and water level in water tank too low.

1. Clean.

c) Water System 1. Water leaks. 1. Check connections for water leaks, and replace.

2. Clogged. 2. Clean.

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

d) Pump Motor 1. Motor winding opened.

1. Replace.

2. Bearing worn out. 2. Replace.

3. Wiring to pump motor. 3. Check for loose connection or open, and replace.

4. Defective capacitor. 4. Replace.

5. Defective or bound impeller.

5. Replace or clean.

6. Mechanical seal worn out.


e) Control Board 1. Defective. 1. See"IV.B.ControlBoardCheck."

[6] Fan motor will not start, or is not operating.

a) Fan Motor 1. Motor winding opened.

1. Replace.

2. Bearing worn out. 2. Replace.

3. Wiring to fan motor. 3. Check for loose connection or open, and replace.

4. Defective capacitor. 4. Replace.

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

b) Magnetic Contactor 1. Bad contacts. 1. Check for continuity and replace.

[7] All components run, but no ice is produced.

a) Refrigerant 1. Undercharged. 1. Check for leaks and recharge.

2. Air or moisture trapped.

2. Replace drier and recharge.

b) Compressor 1. Defective valve. 1. Replace.

c) Hot Gas Valve 1. Continues to open in freeze cycle.


d) Liquid Line Valve 1. Continues to close in freeze cycle.


e) Fill or Harvest Water Valve

1. Water valve is wid

Documents

Hoshizaki · SERVICE MANUAL ™ 2 IMPORTANT Only ... f) Shutdown ... EXTERIOR DIMENSIONS (WxDxH) KMS-1401MLH: 30"x24"x28" (762 x 610 x 711 mm) SRK-14H: 50"x17"x28" (1270 x 432 x 711