Hoshizaki KMS-1401MLJ User Manual

Hoshizaki America, Inc.

Hoshizaki

Modular Crescent Cuber Serenity Series

Model

KMS-1401MLJ

“A Superior Degree

of Reliability”

www.hoshizaki.com

Including Condensing Unit Models

SRK-14J/3

SERVICE MANUAL

Number: 73192 Issued: 12-28-2011

WARNING

Only qualied service technicians should install and service the icemaker. To obtain the name and phone number of your local Hoshizaki Certied Service Representative, visit www.hoshizaki.com. No service should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the icemaker in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage. Proper installation is the responsibility of the installer. Product failure or property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the service of the icemaker.

Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance.

Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsupport@hoshizaki.com

HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269 Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

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

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

IMPORTANT

This manual should be read carefully before the icemaker is serviced. Read the warnings and guidelines contained in this booklet carefully as they provide essential information for the continued safe use, service, and maintenance of the icemaker. Retain this booklet for any further reference that may be necessary.

CONTENTS

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

I. Specications ...................................................................................................................... 7

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

1. KMS-1401MLJ with SRK-14J ................................................................................... 7

2. KMS-1401MLJ with SRK-14J3 ............................................................................... 8

B. Condensing Unit ............................................................................................................ 9

1. SRK-14J ................................................................................................................... 9

2. SRK-14J3 .............................................................................................................. 10

II. General Information ..........................................................................................................11

A. Construction ................................................................................................................11

1. Icemaker ................................................................................................................11

2. Condensing Unit ................................................................................................... 12

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

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

a) 1-Minute Fill Cycle ............................................................................................ 13

b) Initial Harvest Cycle ........................................................................................ 13

c) Freeze Cycle ................................................................................................... 13

d) Pump-Out Cycle ............................................................................................... 14

e) Harvest Cycle .................................................................................................. 14

f) Shutdown ......................................................................................................... 14

2. Sequence Flow Chart ............................................................................................ 15

C. Control Board .............................................................................................................. 16

1. Control Board Layout ............................................................................................. 17

2. 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 & 2) ................................................................. 19

c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................. 20

d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 20

e) Harvest Pump Timer (S4 dip switch 7) ............................................................. 21

f) Factory Use (S4 dip switch 8) ........................................................................... 21

g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 21

h) Float Switch Selector (S5 dip switch 1) ............................................................ 22

i) Rell Counter (S5 dip switch 2 through 5) ......................................................... 22

D. Control and Service Switches ..................................................................................... 23

1. Control Switch ........................................................................................................ 23

2. Service Switch ....................................................................................................... 23

a) DRAIN .............................................................................................................. 23

b) CIRC. ............................................................................................................... 23

c) WASH ............................................................................................................... 23

III. Technical Information ...................................................................................................... 24

A. Water Circuit and Refrigeration Circuit ........................................................................ 24

B. Wiring Diagrams .......................................................................................................... 25

1. KMS-1401MLJ with SRK-14J ................................................................................. 25

2. KMS-1401MLJ with SRK-14J3 .............................................................................. 26

3. Wire Harness Connections .................................................................................... 27

C. Performance Data ....................................................................................................... 28

1. KMS-1401MLJ with SRK-14J ................................................................................. 28

2. KMS-1401MLJ with SRK-14J3 .............................................................................. 29

IV. Service Diagnosis ........................................................................................................... 30

A. Diagnostic Procedure .................................................................................................. 30

B. Control Board Check ................................................................................................... 34

C. Bin Control Check and Cleaning ................................................................................. 35

1. Bin Control Check .................................................................................................. 35

2. Bin Control Cleaning .............................................................................................. 36

D. Float Switch Check and Cleaning ............................................................................... 37

1. Float Switch Check ................................................................................................ 37

2. Float Switch Cleaning ............................................................................................ 38

E. Thermistor Check ........................................................................................................ 39

F. Diagnostic Charts ........................................................................................................ 40

1. No Ice Production ................................................................................................... 40

2. Freeze-Up .............................................................................................................. 41

3. Low Ice Production ................................................................................................ 43

V. Replacement of Components .......................................................................................... 44

A. Service for Refrigerant Lines ....................................................................................... 44

1. Refrigerant Recovery ............................................................................................. 44

2. Brazing .................................................................................................................. 45

3. Evacuation and Recharge (R-404A) ...................................................................... 45

B. Important Notes for Component Replacement ............................................................ 47

VI. Cleaning and Maintenance ............................................................................................ 48

A. Cleaning and Sanitizing Instructions ........................................................................... 48

1. Cleaning Procedure ................................................................................................ 49

2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 50

B. Maintenance ................................................................................................................ 51

C. Preparing the Icemaker for Periods of Non-Use .......................................................... 52

VII. Disposal ......................................................................................................................... 54

Important Safety Information

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

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

This icemaker should be destined only to the use for which it has been expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use. Failure to service and maintain the appliance in accordance with this manual will adversely affect safety, performance, component life, and warranty coverage and may result in costly water damage.

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

• Only qualied service technicians should install and service this icemaker.

• This icemaker must be installed in accordance with applicable national, state, and

local codes and regulations. Failure to meet these code requirements could result in death, electric shock, serious injury, re, or damage to the appliance.

• To reduce the risk of electric shock, do not touch the control switch or service switch

with damp hands.

• Before Servicing the KMS or SRK: To reduce the risk of electric shock, move

the control switch to the "OFF" position and turn off the power supply to the SRK condensing unit. Place the KMS disconnect (if applicable) in the "OFF" position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

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

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

• This appliance is not intended for use by persons (including children) with reduced

physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

• Children should be properly supervised around this appliance.

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

Serious injury could occur or the icemaker could be damaged.

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

icemaker. They might catch re.

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

could cause harm to individuals or damage to the icemaker.

WARNING, continued

• Power supply and ground connection are supplied from the SRK remote condensing

For KMS

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

• Wire harness routing (conduit) and disconnect (if required) must meet national,

state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, re, or damage to the appliance.

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

For SRK

• Electrical connection must be hard-wired and must meet national, state, and local

electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, re, or damage to the appliance.

• The remote condensing unit requires an independent power supply of proper

capacity. See the nameplate for electrical specications. Failure to use an independent power supply of proper capacity can result in a tripped breaker, blown fuses, damage to existing wiring, or component failure. This could lead to heat generation or re.

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

NOTICE

• Follow the instructions in this manual carefully to reduce the risk of costly water

damage.

• In areas where water damage is a concern, install in a contained area with a oor

drain.

• Install the icemaker in a location that stays above freezing. Normal operating

ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the icemaker on during extended periods of non-use, extended

absences, or in sub-freezing temperatures. To properly prepare the icemaker for these occasions, follow the instructions in "VI.C. Preparing the Icemaker for Periods of Non-Use."

• Do not place objects on top of the icemaker.

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

dispenser unit/storage bin.

I. Specications

A. Icemaker

1. KMS-1401MLJ with SRK-14J

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-14J via Factory Supplied

Wire Harness APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F) PER 24 HR. Temp.(°F) 50 70 90 lb./day ( kg/day ) 70 *1420 (644) 1379 (626) 1278 (580) Reference without *marks 80 1389 (630) 1325 (601) 1199 (544)

90 1379 (626) *1280 (581) 1162 (527)

100 1344 (609) 1252 (568) 1054 (478)

SHAPE OF ICE Crescent Cube ICE PRODUCTION PER CYCLE 25.8 lb. (11.7 kg) 1248pcs. ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) 2510(4.70) 2410(4.07) WATER gal./24HR (gal./100 lb.) 250(19.5) 682(48.0) CEE TIER 1 ENERGY STAR YES EXTERIOR DIMENSIONS (WxDxH) 30"x24"x28" (762x610x711 mm) EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear) WEIGHT Net 143 lb. (65 kg), Shipping 177 lb. (80 kg) CONNECTIONS - ELECTRIC Wire Harness Connection from SRK to KMS

- WATER SUPPLY Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT

-CONDENSATION DRAIN OUTLET 5/8" OD Hard Tube

-REFRIGERATION Liquid Line 1 1/16" - 12 UNF Fitting (#10 Parker)

Suction Line 1 1/8" - 12 UNF Fitting (#11 Parker) CUBE CONTROL SYSTEM Float Switch HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer ICE MAKING WATER CONTROL Timer Controlled, Overflow Pipe, and Float Switch COOLING WATER CONTROL N/A BIN CONTROL SYSTEM Mechanical Bin Control COMPRESSOR In SRK CONDENSER Air-Cooled Remote Condensing Unit SRK-14J EVAPORATOR Vertical Type, Stainless Steel and Copper REFRIGERANT CONTROL Thermostatic Expansion Valve

Headmaster (C.P.R.) in SRK-14J (160 PSI) REFRIGERANT CHARGE R404A, 16 lb. 5 oz. (7400g)

(Icemaker 0 lb. 7.1 oz. (200g))

(Cond. Unit 15 lb. 14 oz. (7200g)) DESIGN PRESSURE High 467PSIG, Low 230PSIG CONTROL BOARD CIRCUIT PROTECTION High Voltage Cut-Out (Internal) REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch in SRK-14J

Auto-Reset Discharge Line Thermostat in SRK-14J LOW W ATER PROTECTION Float Switch ACCESSORIES -SUPPLIED N/A

-REQUIRED Dispenser Unit or Ice Storage Bin

SRK-14J Remote Condensing Unit OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC

AMBIENT TEMP. 45-100°F

WATER SUPPLY TEMP. 45-90°F

WATER SUPPLY PRESSURE 10-113 PSIG

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

notice.

2. KMS-1401MLJ with SRK-14J3

Data Pending

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

notice.

B. Condensing Unit

1. SRK-14J

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

(115VAC Supplied to KMS via Factory Wire Harness)

AMPERAGE 13.5 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 lb. (104 kg) Shipping 275 lb. (125 kg)

CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

SRK to KMS: Wire Harness Connection

- REFRIGERANT

COMPRESSOR Hermetic, Model CS16K6E-PFV-255

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 16 lb. 5 oz. (7400g))

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 187 - 253VAC

ACCESSORIES -SUPPLIED Leg 2 pcs

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

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

Auto-Reset Discharge Line Thermostat

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

(Icemaker 0 lb. 7.1 oz. (200g))

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

Hex Head Bolt w/Washer M8x16 8 pcs

Hex Nut M8 8 pcs

-REQUIRED Compatible KMS Icemaker

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

notice.

2. SRK-14J3

Data Pending

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

notice.

II. General Information

A. Construction

1. Icemaker

Harvest Water Valve (WV2)

Spray Tubes

Wash Valve

Hot Gas Valve

Liquid Line Valve

Service Valve (High Side)

Drier

Service Valve (Low Side)

Thermistor

Fill/Rell Water Valve (WV1)

Control Switch

Service Switch

Fuse

Switch Box

Drain Water Valve

Switch Cover

Switch Mount

Extension Bracket

Control Board

Control Box

Pump Motor

Float Switch

Bin Control

Switch Bracket

Bin Control

2. Condensing Unit

SRK-14J Control Box SRK-14J3 Control Box

Fuse

Condenser

Headmaster (C.P.R.)

Hot Gas Valves

Liquid Line Valve

Fuse

Shut-Off Valve (Low Side)

Check Valve

Receiver

Fan Motors and Fan Blades

Shut-Off Valve (High Side)

High Pressure Switch

Compressor

Accumulator

Thermostat (Discharge Pipe)

B. Sequence of Operation

1. Sequence Cycles and Shutdown

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 CB turn on (If yellow "BC OPEN" LED is on, the icemaker will not start. In this case clear ice away from BC actuator paddle in the storage bin area). A 5-second delay occurs at startup. Note that the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.

a) 1-Minute Fill Cycle

LED 4 is on. WV1 opens and the ll period begins. After 1-minute, CB checks for closed F/S. If F/S is closed, the harvest cycle begins. If not, WV1 will remain energized through additional 1-minute cycles until water enters the water tank and F/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 relay, and X13 relay 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 3.9 kΩ from the thermistor and turns harvest termination over to the adjustable harvest timer (S4 dip switch1 & 2). The harvest timer has settings of 60, 90, 120, and 180 seconds. The pump-out timer (S4 dip switch 3&4) acts in place of the harvest timer during cycles with a pump-out (S4 dip switch 5&6). 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, X10 relay, and X13 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. NOTICE!

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 F/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute ll if it is open.

c) Freeze Cycle

LED 1 and LED 4 are on. Comp, FMRs, and PM remain energized. LLVs energize. WV1 and LED 4 energize for 1 min. HGVs, X10, X11, and X13 relays de-energize. For the rst 5 minutes, CB will not terminate the freeze cycle. At the end of 5 minutes, F/S assumes control of the freeze cycle. As ice builds on the evaporator, the water level in the water tank lowers. Freeze continues until F/S opens, provided the 5-minute minimum freeze timer has terminated.

d) Pump-Out Cycle

LEDs 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 water tank and sent down the drain. At the same time, water ows through the small F/S tube to power ush F/S. When the pump-out timer terminates,

pump-out is complete.

The 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter. The pump-out frequency control is factory set, and generally no adjustment is required. However, where water quality is bad and the icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The pump-out frequency control (S4dip switch5&6) can be set to have a pump-out occur every cycle, or every 2, 5, or 10cycles. Timing of the rst pump-out is dependent on S4dip switch 5 & 6 settings. See the table below.

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

Pump-Out

Frequency

1st Pump-Out

e) Harvest Cycle

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

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

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

f) Shutdown

When BC is activated (BC open), the yellow "BC OPEN" LED comes on. The icemaker then shuts down as outlined in the table below.

Cycle at Bin Control Activation

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

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

Shutdown

at the end of the harvest cycle.

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–oat switch; HGVs–hot gas valves; LLVs–liquid line valves; PM–pump motor; WV1–ll/rell water valve; WV2–harvest water valve

2. Sequence Flow Chart

Factory set forevery

10th cycle.

(S4 dip switch 5 & 6)

4. Pump-Out Cycle

Comp continues

FMRs continue

HGVs energized

DV & PM de-energized 2 sec., then

energized for 10/20sec.

To 1 above

LLVs de-energized

"G" Control Board Sequence Flow Chart

KMS-1401MLJ with SRK-14J/3

3. Freeze Cycle

• Minimum freeze time: 5 min.

• Maximum freeze time: freeze timer setting

(S4 dip switch 9 & 10).

F/S in control

5-min. minimum

freeze timer in

1 to 3-min. harvest timer in control

(S4 dip switch 1 & 2)

control

Rell

HarvestPump

Timer

F/S closed

1 min.

50 sec.

F/S opens or freeze

timer terminates

Comp continues

FMRs continue

PM continues

LLVs energized

WV1 energized rst 1 min. of freeze

HGVs de-energized

F/S check

PM energized

WV2 de-energized

Thermistor temperature reaches

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts (1 to 3 min.).

F/S open

3. Ice Level Lowered

2. Icemaker Off

Icemaker starts at "1. 1-Minute Fill Cycle."

BC closed (BC actuator paddle disengaged)

Green "BC CLOSED" LED on

Yellow "BC OPEN" LED off

All components

de-energized.

Yellow "BC OPEN" LED continues

All components de-energized

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

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.

DRAIN

CIRC.

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 icemaker is in service mode.

The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.

WASH

Thermistor

(S4 dip switch 7), whichever is shorter.

• WV2 time: 6 min. or the length of harvest minus 50 sec.

• Maximum harvest time: 20 min.

2. Harvest Cycle

1. 1-Minute

Fill Cycle

Cycle

Steps

in control

F/S closed

Startup

Comp energized

FMRs energized

HGVs energized

WV2 energized

WV1 de-energized

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

• Fill Cycle – 15 sec. after activation.

Shutdown Delay:

F/S check

F/S open

WV1 energized

1. Bin Full

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

Shutdown

andRestart

the 5-min. short cycle protection timer terminates.

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

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

Otherwise, at the end of the next harvest cycle.

BC open (BC actuator paddle engaged)

Green "BC CLOSED" LED off

Yellow "BC OPEN" LED on

BC Operation

Legend:

Comp-compressor

DV-drain valve

FMRs-fan motors-remote

F/S-oat switch

HGVs-hot gas valves (KMS and SRK)

LLVs-liquid line valves (KMS and SRK)

PM-pump motor

WV1-ll/rell water valve

WV2-harvest water valve

C. Control Board

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

• All models are pretested and factory adjusted.

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

NOTICE

• Fragile, handle very carefully.

• The control board contains integrated circuits, which are susceptible to failure

due to static discharge. It is especially important to touch the metal part of the icemaker when handling or replacing the control board.

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

board.

• Do not change wiring and connections. Do not misconnect terminals.

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

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

1. Control Board Layout

"G" Control Board

• "ALARM RESET" Button • S4 Dip Switch

• Bin Control Switch Closed LED (green)

• Bin Control Switch Open LED (yellow)

• Part Number

• Alarm Buzzer

• Power LED (red)

(lights when

10.5VAC is supplied to K2 connector)

• Relay LEDs

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

• LED 2 (X2 Relay)

LED 2 on: K1 Connector Pin #2 LED 2 off: K1 Connector Pin #3

• 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)

• "OUTPUT TEST" Button

(used to test relays on control board)

• K3 (white) Connector

Harvest Control (thermistor)

• K4 (red) Connector

Bin Control

• S5 Dip Switch

• K5 (black) Connector

Float Switch

• Label

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

• K1 Connector

Pins #1 through #10 #1, 9 Magnetic Contactor, X13 Relay (holding circuit during Harvest Pump Timer), and Drain Valve (during Pump-Out) #2 Hot Gas Valves (KMS and SRK) and X10 Relay #3 Liquid Line Valves #4 Pump Motor (freeze) #5 X11 Relay (Pump Motor in Harvest Pump Timer and Drain Valve in Pump-Out) #6 Fill Water Valve (InitialFill and Freeze Fill only); Harvest WaterValve and X12 Relay (Harvest only) #7, 10 Supply Voltage #8 Open

"G" Control Board

Part Number 2A3792-01

+ 37 hidden pages