Hoshizaki KMS1402MLJ User Manual

Service Manual

Modular Crescent Cuber

Model

KMS-1402MLJ

Including
Condensing Unit Models
SRK-15J/3

hoshizakiamerica.com

Number: 73224
Issued: 5-16-2018

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No installation or service should be
undertaken until the technician has thoroughly read this Service Manual. Likewise,
the owner/manager should not proceed to operate the appliance until the installer
has instructed them on its proper operation. Failure to install, operate, 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. 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
installation, maintenance, and service of the appliance.

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: [phone]
Fax: [phone]

E-mail: [e-mail]

618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

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

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

2

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. Construction and Water/Refrigeration Circuit Diagrams ..................................................... 7

A. Construction ................................................................................................................. 7

1. Icemaker ................................................................................................................. 7

2. Condensing Unit ..................................................................................................... 8

B. Water Circuit/Refrigeration Circuit Diagram ................................................................... 9

II. Sequence of Operation and Service Diagnosis ............................................................... 10

A. Sequence of Operation Flow Chart ............................................................................. 10

1. Operation Flow Chart ............................................................................................ 10

2. Shutdown Flow Chart .............................................................................................11

3. Freeze-Time Correction Chart ............................................................................... 12

B. Service Diagnosis ....................................................................................................... 13

C. Freeze-Time Correction Cycle (90 min.) ..................................................................... 22

D. Control Board Check ................................................................................................... 24

E. Bin Control Check ....................................................................................................... 26

F. Float Switch Check and Cleaning ................................................................................ 28

G. Thermistor Check ........................................................................................................ 30

H. Switches ...................................................................................................................... 31

1. Control Switch ........................................................................................................ 31

2. Service Switch ....................................................................................................... 31

I. Diagnostic Tables .......................................................................................................... 32

J. Freeze-Up Check List .................................................................................................. 36

III. Settings and Adjustments ............................................................................................... 37

A. Control Board Layout .................................................................................................. 38

B. LED Lights and Audible Alarm Safeties ....................................................................... 39

C. Settings and Adjustments ............................................................................................ 40

1. Default Dip Switch Settings .................................................................................... 40

2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 41

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ................. 41

4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 42

5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6) ........................... 42

6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7) .. 43

7. Factory Use (S4 dip switch 8)................................................................................. 43

8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 44

9. Float Switch Control Selector (S5 dip switch 1) ..................................................... 44

10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 45

11. Minimum Harvest Time (S5 dip switch 4) ............................................................. 45

12. Anti-Slush (S5 dip switch 5) ................................................................................. 45

3

IV. Refrigeration Circuit and Component Service Information.............................................. 46

A. Refrigeration Circuit Service Information .................................................................... 46

B. Component Service Information .................................................................................. 49

V. Maintenance .................................................................................................................... 50

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 51

VII. Disposal ......................................................................................................................... 53

VIII. Technical Information .................................................................................................... 54

A. Specication and Performance Data Sheets ............................................................... 54

1. KMS-1402MLJ with SRK-15J ................................................................................. 54

2. KMS-1402MLJ with SRK-15J3 .............................................................................. 55

3. SRK-15J ................................................................................................................ 56

4. SRK-15J3 .............................................................................................................. 57

B. Wiring Diagrams .......................................................................................................... 58

1. Wire Harness Connections ..................................................................................... 58

2. KMS-1402MLJ with SRK-15J ................................................................................ 59

3. KMS-1402MLJ with SRK-15J3 .............................................................................. 60

4

Important Safety Information

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

• This appliance 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 appliance. Alterations could result in electric
shock, injury, re, or damage to the appliance.

• 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 appliance or allow children or animals to do so.
Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the
appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.

5

WARNING, continued

For KMS

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

Failure to properly ground the appliance

• Risk of electric shock. Control switch in "OFF" position does not de-energize all
loads.

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 APPLIANCE MUST BE GROUNDED.
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 appliance 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 appliance on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the appliance for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."

• Do not place objects on top of the appliance.

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

6

I. Construction and Water/Refrigeration Circuit Diagrams

A. Construction

1. Icemaker

Harvest Water Valve (WV2)

Evaporator

Spray Tubes

Wash Valve

Hot Gas Valve

Liquid Line Valve

Liquid Line
Shutoff Valve

Drier

Suction Line
Shutoff Valve

Thermistor

Control Board

Control Box

Fill/Rell Water Valve (WV1)

Control Switch

Service Switch

Drain Water Valve

Fuse

Switch Box

Switch Cover

Switch Mount

Extension Bracket

Bin Control

Pump Motor

Float Switch

Bin Control

Switch Bracket

7

2. Condensing Unit

Liquid Line Valve

Suction Line
Shutoff Valve

Liquid Line
Shutoff Valve

SRK-15J Control Box

Headmaster (C.P.R.)

Fuse

Condenser

Hot Gas Valves

SRK-15J3 Control Box

Fuse

Check Valve

Receiver

Accumulator

Fan Motors and Fan Blades

Liquid Line Shutoff Valve 2

Discharge Line Shutoff Valve

Thermostat (Discharge Pipe)

Crankcase Heater

Compressor

High Pressure Switch

8

B. Water Circuit/Refrigeration Circuit Diagram

Discharge Line

Shutoff Valve

Discharge Line

Headmaster

(C.P. R.)

Condenser

Check Valve

Access Valve

Thermostat

Strainers

Hot Gas Valves

Liquid Line Valve

Service Valve

Strainer

High-Pressure

Switch

SRK-15J/3

Wash Valve

Drier

Liquid Line Valve Body

Receiver

Fan

Suction Line

Thermistor

Liquid Line

Shutoff Valve

Service Valve

Service Valve

Liquid Line

Shutoff Valve

Strainer

Discharge

Line

Hot Gas

Valve Body

Compressor

Accumulator

Check Valves

Float Switch

Expansion Valves

Drain Valve

Water Supply

KMS-1402MLJ

Harvest Water

Valve (WV 2)

Spray Tube

Evaporator

Fill/Rell Water

Valve (WV (WV 1)

9

Drain

Pump Motor

Water Tank

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

cycle

(S4 dip switch 5)

4. Pump-Out Cycle

• Factory set for every 10th

FS in control

FS opens or freeze

timer terminates

Comp energized

FMRs energized

HGVs energized

DV energized

PM stops for 2 sec., then

Anti-Slush

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for

energized for 10/20 sec.

LLV de-energized

10 sec.

When freeze time differential exceeded,

freeze-time correction cycle starts.

See "II.A.3. Freeze-Time Correction Chart."

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer setting

(S4 dip switch 9 & 10).

5-min minimum

freeze timer in

control

3. Freeze Cycle

Harvest Pump

Time

Operation Flow Chart

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

setting (S4 dip switch 6), whichever is shorter.

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

• Max. harvest time: 20 min.

2. Harvest Cycle

Rell

1 min.

50 sec.

FS closed

FS check

PM energized

WV2 de-energized

FS closed

Comp energized

FMRs energized

Thermistor temperature reaches

Comp energized

FMRs energized

PM energized

48°F (9°C) (3.9 kΩ or less). Harvest

HGVs energized

LLVs energized

WV1 energized rst

1 min. of freeze

HGVs de-energized

FS open

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.

timer starts.

WV2 energized

WV1 de-energized

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

WASH

WV1 energized

FS open

If FS is open, Comp stops and cycle

returns to 1-Min. ll.

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

Fill Cycle

FS check

1. 1-Minute

10

Cycle

Steps

Startup

2. Shutdown Flow Chart

3. Ice Level Lowered

2. Icemaker Off

Icemaker starts at

All components

"1. 1-Minute Fill Cycle."

de-energized.

To 1. 1-Minute Fill Cycle

BC closed

(BC actuator paddle disengaged)

Green "BC CLOSED" LED on

Yellow "BC OPEN" LED off

Yellow "BC OPEN" LED continues. All

components de-energized.

Shutdown Flow Chart

Note: Control board retains freeze-time correction count

data between bin control restarts.

to 15 sec. into the freeze cycle if

activated at the end of the harvest cycle.

15 sec. before the 5-min. short cycle protection

timer terminates. Otherwise, at the end of the next

harvest cycle.

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

BC open (BC actuator paddle engaged)

Green "BC CLOSED" LED off

Yellow "BC OPEN" LED on

BC Operation

Legend:

BC–bin control

1. Bin Full

Shutdown

Shutdown Delay:

and Restart

• Fill Cycle–15 sec. after activation.

• Harvest Cycle–At the end of the harvest cycle, or up

11

3. Freeze-Time Correction Chart

Overow

2. 10-Minute Fill/

WV energized

Comp de-energized

FMRs de-energized

HGVs de-energized

PM de-energized

After 5th 10-Minute Harvest Pump Cycle with WV

Freeze-Time Correction Cycle Complete.

Go to Step "3. Freeze Cycle" in Operation Flow Chart.

step 1 for 5th and nal time.

• Do not adjust S4 dip switch 7 out of the factory position.

• After step 2 completes 4th sequence (80 min. completed), repeat

1. 10-Minute Harvest Cycle with WV

Comp energized

FMRs energized

HGVs energized

PM energized

WV energized

Freeze-Time Correction Flow Chart

Cycle Steps

Steps 1 and 2 repeat

4 times (total 80 min.),

then step 1 repeats for

a 5th time to complete

Freeze-Time Correction

Start

Legend:

Comp–compressor

FM–fan motor

FMRs–fan motor-remote

HGVs–hot gas valve

PM–pump motor

WV–inlet water valve

Appliance Cycle Reset and Alarm Reset:

Cycle Reset: Power Supply or Control Switch Turned Off and On again:

Appliance turns off, then re-starts at 1.Fill Cycle.

Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time

correction cycle with power supply on:

Appliance continues cycle with no interruption or reset.

CB red "POWER OK" LED blinking:

CB red "POWER OK" LED resets to solid.

CB yellow "EXT HARVEST" LED blinking:

Cycle.

Differential

Value in Sec.

3 254

4 309

5 349

6 380

7 406

8 427

9 446

10 462

CB yellow "EXT HARVEST: LED turns off.

Number of

Freeze Time Differential Exceeded.

Minimum and Maximum Freeze times have

exceeded differential parameters.

Freeze-Time Correction function is enabled

when S4 Dip Switch 7 is in the "ON" position.

CB monitors freeze time. After 3freeze

cycles, CB compares the minimum and

maximum differential of the 3 freeze cycle

times. Every freeze cycle time after the third

freeze cycle time is added to the minimum/

maximum calculation.

Example: After 8 cycles, if the differential

between the shortest cycle (minimum) and

the longest cycle (maximum) is equal to or

greater than 427 sec. a freeze-time correction

cycle is initiated:

Freeze Cycles

Note: When 1st freeze-time correction cycle

is initiated, CB "POWER OK" LED starts

blinking. On 2nd freeze-time correction cycle,

if CB "POWER OK" LED has been reset,

CB "POWER OK" LED starts blinking. If CB

"POWER OK" had not been reset after 1st

freeze-time correction cycle CB "POWER

OK" LED continues to blink.

After 3rd freeze-time correction cycle in

36hours, CB yellow "EXT HARVEST" LED

starts blinking.

Appliance continues to operate and LEDs

continue to blink until ALARM RESET button

is pressed with power on.

12

B. Service Diagnosis

WARNING

• This appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

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

• Risk of electric shock. Control switch (KMS) in "OFF" position does not
de-energize all loads.

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

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

• Make sure all food zones in the icemaker and dispenser unit/storage bin are clean
after service. For cleaning procedures, see "V. Maintenance."

1. Diagnostic Procedure

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per nameplate, and adequate water supply.

Note: • When checking high voltage (115VAC), always choose a neutral (W) to establish

a good neutral connection.

• On 3-phase models, the neutral (W) is provided through MT. To conrm a good
neutral (W), check for 60VAC from neutral (W) to ground (GND). If 60VAC is
present, neutral (W) is good. If 60VAC is not present, check 208-230VAC main
power supply to MT. If 208-230VAC is present, check MT continuity.

• When checking voltage from the CB K1 connector (10 pin connector), pull CB
K1connector out slightly to allow room for multimeter test leads contact.

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

2) Check that the 115VAC 10A fuses in the KMS and SRK are good.

Conrm that the location meets installation requirements:

KMS-1402MLJ:

• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).

• No clearance is required for proper operation

• The appliance should not be located in a corrosive environment.

SRK-15J/3:

• A dry and well ventilated area with 24" (61 cm) clearance in both front and rear for
proper air circulation and ease of maintenance and/or service should they be required.

13

3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5-sec. delay occurs. CB red "POWER OK" LED and CB green "BC CLOSED" LED
turn on. If CB yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice
away from BC actuator paddle. If CB yellow "BC OPEN" LED stays on, see"II.E.1. Bin
Control Check."

Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is

interrupted (K2 connector).

• Check CB using the steps in "II.D. Control Board Check."

• Conrm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,
remove ice from BC. If no ice is around BC and CB yellow "BC OPEN" LED is
on, see "II.E.1. Bin Control Check."

a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm 10A fuse on

both the KMS and the SRK are good. Conrm wire harness is connected and not
damaged. Next, check SRK switches. Check for 115VAC at both HPS wires (BR) to
neutral (W). If 115VAC is present on one and not the other, HPS is open. If HPS is
open, see "b) HPS Diagnosis" below. If HPS is closed, check for 115VAC at both
DLT wires (BR) to neutral (W). If 115VAC is present on one and not the other, DLT
is open. If DLT is open, see "c) DLT Diagnosis" below. If DLT is closed, check for
115VAC at control switch #2 (BR) to neutral (W) then at control switch #3(BK) to
neutral (W). If 115VAC is present on #2 (BR) and not on #3 (BK), replace control
switch. If 115VAC is present on control switch #3 (BK), check for 10.5VAC at CB
K2#1 red wire to CB K2 #2 red wire. If 10.5VAC is not present, check CT wire
connections and CT continuity. If open, replace CT.

b) HPS Diagnosis: Check that all shutoff valves (4 total) are open and the condenser

coil is not clogged or restricted. Let refrigeration circuit pressures equalize. If HPS
does not reset and pressures are equalized, replace HPS. If pressures are not
equalized, reclaim refrigerant and diagnose refrigeration circuit restriction. Check
that there are no restrictions in the refrigeration circuit.
Harvest Cycle: HGVs, strainer, or check valve.
Freeze Cycle: FMRs, TXV, HM, LLVs, strainer, check valve, drier, and damaged line
set or tting.

c) DLT Diagnosis: Check that the condenser coil is not clogged or restricted. Let

discharge line thermostat cool, if DLT does not close, replace DLT. Once closed,
restart appliance, once Comp starts, check voltage and amp draw.
See "5a),a) Comp Diagnosis" below.

14

4) 1-Min. Fill Cycle – LED 4 is on. WV1 energizes. After 1 min., CB checks for a closed
FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGVs,
and FMRs energized), continue to step 5a. If FS is open, WV1 remains energized until
FS closes (low water safety protection during initial start up and at the end of each
harvest). Diagnosis: Check that water enters the water tank. If not, check that the water
supply line shut-off valve is open and screens or external lters are clear. Check for
115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC
is present, and WV1 does not energize, check for 115VAC at X10 relay terminal #6 (O)
to neutral (W) and X10 relay terminal #2 (W/O) to neutral (W). If 115VAC is present on
relay terminal #6 (O) and not on relay terminal #2 (W/O), check for 115VAC on
X10 relay terminal #8 (P) to neutral (W), if 115VAC is present replace CB. If 115VAC is
not present replace X10 relay. If 115VAC is present, and WV1 does not energize, check
for 115VAC at WV1. If 115VAC is present, check WV1 coil continuity. If open, replace
WV1. If the water tank lls, but the appliance fails to start harvest (Comp energized),
check for open FS. See "II.F. Float Switch Check and Cleaning." If FS is closed and CB
fails to start the harvest cycle after 1 min., replace CB.

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV1 continues. Comp, FMRs,

HGVs, WV2, X10 relay, 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 harvest timer (S4 dip switch 1 & 2 and S5 dip
switch 4). WV2 and X12 relay are energized during harvest for a maximum of 6 min.
or the length of harvest minus HPT setting (S4 dip switch 6), whichever is shorter.
See step 5b below. X13 remains energized throughout harvest cycle to prevent DV
from energizing.

a) Comp Diagnosis: Check that evaporator is warming. If not, conrm that Comp

energizes. If not, check for 115VAC at CB K1 #1 (V) to neutral (W). If 115VAC is not
present, check for 115VAC at CB K1 #10 (BR) to neutral (W). If 115VAC is present
at #10 (BR) and not at #1 (V), replace CB. If 115VAC is present, check for 115VAC
at MC solenoid (SRK). If 115VAC not present, check wire harness connections.
If 115VAC is present, conrm contacts are closed. If not, replace MC. If MC contacts
are closed, check Comp start and run capacitors, start relay (single phase), and
Comp motor winding.

b) HGVs Diagnosis: If Comp is energized and evaporator is not warming, check that

HGVs energize and open. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at
HGVs coil (KMS and SRK) and check HGVs coils continuity. Replace as needed.

c) LLVs Diagnosis: Conrm that both LLVs are de-energized (KMS and SRK) and

closed (not bypassing). If energized, replace CB. If de-energized and bypassing,
replace LLVs (KMS and SRK).

15

d) Relays:

1. X10 (WV1 and WV2): If WV1 continues and WV2 does not energize, check for
115VAC between X10 relay terminal #4 (GY) to neutral (W) and X10 relay terminal
#2 (W/O) to neutral (W). If 115VAC is present at relay terminal #2 (W/O) and not
at relay terminal #4 (GY), check for 115VAC at relay terminal #8 (P). If 115 VAC is
present at relay terminal #8 (P) and not at relay terminal #4 (GY), replace relay.
If 115VAC is present at relay terminal #4 (GY) and not at relay terminal #2 (W/O)
and WV1 contines, clean or replace WV1.

2. X12 Relay (DV Lockout relay 1) and X13 Relay (DV Lockout relay 2):
If DV energizes (water owing down the drain) check for 115VAC at X12 relay
terminal #8 (GY) to neutral (W). If 115VAC is not present see "d)1. X10 (WV1 and
WV2)" above. If 115VAC is present, check X12 relay terminal #6 (Y) to neutral (W)
and #4 (P) to neutral (W). If 115VAC is not present from X12 relay terminal #6 (Y)
to neutral (W), check for 115VAC on X10 relay terminal #5 (V) and relay terminal
#3 (Y) to neutral (W). If 115VAC is present on X10 relay terminal #5 (V) and not on
relay terminal #3 (Y) replace X10 relay. If 115VAC is present on relay terminal #6 (Y)
and not on X12 relay terminal #4 (P) replace X12 relay. If 115VAC is present on
X12 relay terminal #4 (P), check for 115 VAC at X13 relay terminal #8 (P) to neutral
(W). If 115VAC is present, check for 115VAC at X13 relay terminal #2 (W/BK) to
neutral (W). If 115VAC is present at X13 relay terminal #2 (W/BK), replace
X13 relay. If 115VAC is not present on X13 relay terminal #2 (W/BK) and water is
going down the drain, clean or replace DV.

3. X11 (DV/HPT relay): If PM energizes during initial harvest, check X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is present, and CB LED 3 is off, replace
CB. If 115VAC is not present, check for 115VAC at X11 terminal #6 (R) to neutral
(W). If 115VAC is present and CB LED 3 is off, replace X11 relay. Check X11 relay
terminal #5 (W/BU) to neutral (W). If 115VAC is present, check X11 relay terminal
#8 (DBU) to neutral (W). If 115VAC is present on X11 relay terminal #8 (DBU) and
CB LED 3 is off, replace CB.

16

5b) Harvest Pump Timer – LEDs 1, 3, and 2 are on. When the thermistor reaches 48°F

(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the
harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). When WV2 de-energizes, LED
4 turns off, X12 relay de-energizes. LED 3 turns on and X11 relay energizes, allowing
PM to energize. Comp, FMRs, HGVs, X10, and X13 relays continue.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it
warmed to 48°F (9°C) or warmer? Conrm thermistor status. See "II.G. Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does not
energize before harvest terminates, replace CB. If WV2 continues, check for 115VAC
at CB K1 #6 (O) to neutral (W). If 115VAC is present, and LED 4 is off, replace CB.
If 115VAC is not present, and WV2 continues, check WV2 diaphragm for leaking by.
Clean or replace. If LED 3 is on and PM is not energized, check for 115VAC at X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is not present at X11 terminal relay
#8 (DBU), replace CB. If 115VAC is present, check for 115VAC at X11 relay terminal
#4 (P) to neutral (W) and X11 relay terminal #6 (R). If 115VAC is present at X11 relay
terminal #4 (P) and not at X11 relay terminal #6 (R), replace X11 relay. If 115VAC is
present at X11 relay terminal #6 (R), check control switch contact continuity between
terminals #6 (R) and #5 (W/R). If contacts are open, replace control switch. If contacts
are closed and 115VAC is present between control switch terminal #5 (W/R) and neutral
(W), check PM capacitor and motor winding continuity.

5c) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F

(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to
the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). Check discharge line
temperature. For a thermistor check, see "II.G.Thermistor Check." Once harvest timer
terminates, LED 3 & 2 turn off and freeze cycle starts. If 1-min. ll cycle starts after
harvest timer terminates, check that FS is clean and operating properly, see "II.F. Float
Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle. Ifnot,
replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.

NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.

17

6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize.
HGVs, X10, X11, and X13 relays de-energize. Appliance is held in freeze by a 5-min.
short cycle protection timer. After 5-min. short cycle protection timer terminates and FS
opens, freeze cycle terminates.
Note: PM power supply switches from CB K1 #5 (DBU) in HPT to K1 #4 (R) in freeze.

Rell – LEDs 1 and 4 are on. The KMS-1402MLJ uses a single F/S with a double F/S,
UF/S rell initiation oat switch setting (S5 dip switch1) and is set for 1 rell (S5 dip
switch 2 through 3). When the freeze cycle starts, CB monitors UF/S. No UF/S exists
on the KMS-1402MLJ, therefore CB reads an open UF/S signal when the freeze cycle
starts and immediately initiates a rell (CB energizes WV1 through X10 relay). Since
there is no UF/S to close and terminate the rell, the rell lasts for the maximum time of
1-minute. During the 1-minute rell, LED 4 is on. Comp, FMRs, LLVs, and PM continue.

Anti-Slush: When anti-slush is enabled (S5 dip switch 5 "ON"), PM de-energizes when

thermistor reaches 36°F (2.2°C) (5.8kΩ) for 10 sec. then, energizes for the remainder of
the freeze cycle.

a) Freeze Cycle Diagnosis: Conrm Comp, FMRs, and PM continue. Conrm that

LLVs energize. Next, conrm HGVs, X10, X11, and X13 relays de-energize. During
the rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm that WV1 and
WV2 are de-energized (not leaking by), HGVs de-energized (not bypassing), LLVs
energize, TXV and HM operate correctly, Comp is efficient, and refrigerant charge is
correct. See "VIII.A. Specication and Performance Data Sheets."

b) Comp and FMRs Diagnosis: If Comp and FMRs de-energize once freeze begins,

check that appliance has not shut off on HPS or DLT ("POWER OK" LED off).
If so, check "3)b) HPS Diagnosis" or "3)c) DLT Diagnosis" above. If CB "POWER
OK" LED is on (KMS), check for 115VAC at CB K1 #9 (V) to neutral (W). If115VAC
is not present and LED 1 is on, replace CB. If 115VAC is present, check for 115VAC
at MC coil (SRK). If 115VAC is not present, check wire harness connections. Next,
check for 115VAC at MC coil. If 115VAC is present, check MC coil and contacts
continuity. Replace as needed. Next, check Comp start relay, start and run capacitors
(single phase), and Comp motor winding continuity. If Comp is energized but
evaporator is not cooling, check for an inefficient Comp. See "VIII.A. Specication
and Performance Data Sheets."
FMRs Diagnosis: If Comp is energized but FMRs are not, check for 115VAC at
MC terminal "NO" black (BK) wire to neutral (W). If 115VAC is not present, and
MC is energized replace MC. If 115VAC is present, check FMRs capacitors, motor
windings, and fan blades for binding.

c) WV1, WV2, and HGVs Diagnosis: WV1/WV2: If WV1or WV2 energized or

bypassing, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is present
after PM energizes and LEDs 2 and 4 are off, replace CB. If 115VAC is not present,
clean or replace WV1 or WV2 (bypassing). HGVs: If HGVs did not de-energize at the
end of harvest and LED 2 is off, check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is present and LEDs 2 and 3 are off, replace CB. If 115VAC is not present,
replace (defective) HGVs.

18

d) PM Diagnosis: Conrm water is owing over evaporator from PM and not WV1

or WV2. IfPM de-energizes once freeze begins (except for anti-slush), check for
115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB.
If 115VAC is present and PM is de-energized, check for 115VAC at control switch
#5 (W/R) to neutral (W). If115VAC is present at CB K1 #4 (R) and not at control
switch #5 (W/R), check control switch continuity between #5 (W/R) and #6 (R).
Replace as needed. If115VAC is present at control switch #5 (W/R) to neutral (W),
check PM capacitor and motor winding continuity.

e) LLVs Diagnosis: If LLVs do not energize, check for 115VAC at CB K1#3 (BK) to

neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, check wire
harness, wiring connections, coil voltage and continuity. Replace as needed.

f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,

check refrigerant pressures. See "VIII.A. Specication and Performance Data
Sheets." Next, check HM operation. If refrigeration pressures are above HM setpoint
and HMis bypassing, replace HM. Check TXV for proper operation. Remove TXV
bulb and hold it in your hand, refrigerant low-side pressure should rise, place
TXV bulb in ice water, refrigerant low-side pressure should drop. A 10 to 15 pound
pressure swing between warm and cold conditions indicate a good TXV. If a 10 to
15 pound swing is not present, replace TXV.

g) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS

connector. 15 sec. later appliance should switch out of the freeze cycle (15 second
delay after FS opens before terminating the freeze cycle). If appliance remains in
freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with
FS removed but would previously not switch out of freeze with FS connected (long
freeze - 3 beep alarm), see "II.F. Float Switch Check and Cleaning."

Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.

Cycle times and pressures should follow performance data provided in this
manual. See "VIII.A. Specication and Performance Data Sheets."

h) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.

ll and harvest cycles. If not, check water supply lters, shut-off valve, WV1 and WV2
screens. Ifwater tank empties before 5 min. timer terminates and freeze cycle is
short, check that DV is not bypassing or energized (water owing through DV). If DV
is bypassing, remove and clean DV, replace as needed. If water tank is full, see "II.F.
Float Switch Check and Cleaning." for erratic operating FS.

19

7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
rst pump-out is determined by S4 dip switch 5. See the table below.

Control Board Settings

S4 Dip Switch Setting

No. 5

OFF Every 10 cycles After 11th freeze cycle

ON Every cycle After 2nd freeze cycle

Pump-Out Frequency Control Board

Comp and FMRs continue, HGVs energize.
Note: If S4 dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV2 and X12
relay energize, energizing X13 relay. NOTICE!S4dip switch 3 & 4 must not be set to

3 off and 4 on. Otherwise, LED 4 turns on energizing WV2, X12, and X13 relays.
Once X13 relay energizes, DV cannot energize.

LLVs de-energize. PM stops for 2 sec., then restarts for 10/20 sec. depending on
pump-out timer (S4dip switch 3 & 4) setting. When the pump-out timer terminates,
pump-out is complete. The pump-out frequency control (S4 dip switch 5) is factory set,
and generally no adjustment is required. However, the pump-out frequency control
can be set to have a pump-out occur every cycle. For details, see "III.C.4. Pump-Out
Frequency Control (S4 dip switch 5)."

a) Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after

5min. of freeze disconnect CB black K5 connector (FS connector). Check that CB
LEDs 1, 3, and 2are on, PM stops, then restarts, DV energizes, and water is owing
down the drain through DV.

b) CB Diagnosis:

PM: If PM does not stop and restart, check that CB LEDs 1, 3, and 2are on.
Ifnot and pump-out is called for, replace CB. IfLEDs 1, 3, and 2are on, X11 relay
energizes. If not, check for 115VAC at CB K1 #5 (DBU) to neutral(W). If115VAC is
not present, replace CB. If115VAC is present at CB K1 #5 (DBU) and X11 relay is not
energized, continue to "c) PM Diagnosis:" below.
DV: If DV is not energized, check for 115VAC at CB K1 #1(V) to neutral(W).
If LED 2 is on and 115VAC is not present at CB K1 #1 (V), replace CB. If 115VAC is
present at CB K1 #1 (V) to neutral (W), continue to "d) DV Diagnosis" below.

c) PM Diagnosis: If 115VAC is present at CB K1 #5 (DBU), X11 relay energizes. Check

for 115VAC at X11 relay #8 (DBU) to neutral (W). If115VAC is not present, check
wiring connections from CB K1 #5 (DBU) to X11 relay #8 (DBU). If115VAC is present
at X11 relay #8 (DBU) and PM does not restart, check for 115VAC at X11 relay
terminal #4 (P) and terminal #(6) to neutral (W). If115VAC is present on #4 (P) and
not on #6 (R), replace X11 relay (sticking contacts). If 115VAC is present at X11 relay
#6 (R) and PM is de-energized, check for 115VAC at control switch
#6 (R) and #5(W/R) to neutral (W). If 115VAC is present at #6 (R) and not at
#5 (W/R), replace control switch. If 115VAC is present at control #5 (W/R), check PM
capacitor, motor winding, wiring connections, and impeller for binding.

20

d) DV Diagnosis: X10 Relay: If 115VAC is present at CB K1 #1 (V) to neutral (W) and

DV is de-energized, check for 115VAC at X10 relay #5 (V) and #3 (Y) to neutral (W).
If115VAC is present at #5 (V) and not at #3 (Y), conrm X10 relay is de-energized.
Ifde-energized, replace X10 relay (sticking contacts). If energized, conrm
LEDs 1, 2, and 3 are on. If LED 1, 3, and 2 are on and X10 relay is energized,
replace CB.
X13 Relay: Next, If 115VAC is present at X10 #3 (Y) to neutral (W), check for 115VAC
at X13 #6 (Y) and #2 (W/BK) to neutral (W). If 115VAC is not present on #6(Y),
check wiring from X10 relay #3 (Y). If 115VAC is present at X6 (Y) and not at
#2 (W/BK), conrm X13 is de-energized. If energized, conrm CB LEDs 1, 2, and
3 are on. If LEDs 1, 2, and 3 are on and X13 relay is energized, X12 relay must
be energized also. Replace CB. If 115VAC is present at X13 #2 (W/BK), check for
115VAC at X11 relay #3 (W/BK).
X11 Relay: Check for 115VAC at X11 relay #3 (W/BK). If 115VAC is not present check
wiring connections from X13 relay #2 (W/BK). If 115VAC is present at X11 #3 (W/
BK), check for 115VAC at X11 #5 (W/BU) to neutral (W). If 115VAC is present at X11
#3 (W/BK) and not at #5 (W/BU), conrm 115VAC from X11relay #8 (DBU) to #7
(W). If115VAC is present, replace X11 relay (sticking contacts). If 115VAC is present
at X11 relay #5 (W/BU) and DV is de-energized, check wiring to DV from X11 relay
#5 (W/BU), DV coil continuity, make sure the drain line is not clogged and that DV is
clean and operating properly.

8)Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5a) above.
Note: Appliance continues to cycle until BC is satised or power is switched off. The

appliance always restarts at the 1-min. ll cycle.

2. Shutdown Diagnosis

When the appliance is running, hold ice in contact with the thermostatic bulb. BC switch
opens within 10 sec., shutting down the appliance. BC is factory set, and generally
no adjustment is required. However, adjustment may be needed in some conditions,
particularly at higher altitude locations. Diagnosis: See "II.E. Bin Control Check." CB red
K4 connector must have the jumper in place. When the jumper is in place, the green "BC
CLOSED" LED remains on. If the jumper is not in place, yellow "BC OPEN" LED turns
on and the icemaker turns off and remains off until the jumper is replaced in its original
position.

3. Freeze-Time Correction Cycle Diagnosis

1) See "II.C. Freeze-Time Correction Cycle (90 min.).""

Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;

CV–cleaning valve; DV–drain valve; FMRs–fan motor remote;
FS–oat switch; HGVs–hot gas valve; HM–headmaster (C.P.R.);
HPS–high-pressure switch; LLVs–liquid line valve; MC–magnetic contactor:
MT–main transformer; PM–pump motor; TXV–thermostatic expansion valve;
WV1–ll/re-ll water valve; WV2–harvest water valve

21

C. Freeze-Time Correction Cycle (90 min.)

Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position
and initiates when the minimum and maximum freeze times have exceeded differential
parameters. Freeze-time correction timer and count starts at the beginning of the 2nd
freeze cycle after startup from power off condition. Freeze-time correction timer and
count continues and retains its freeze-time correction timer and count during a BC off
cycle and resumes its freeze-time correction timer and count on the 2nd freeze cycle
after BC restart. If freeze-time differential is exceeded (see table below), freeze-time
correction cycle starts and CB red "POWER OK" LED blinks. When freeze-time
correction cycle occurs 3 or more times within a 36 hour period, CB yellow "EXT
HARVEST" LED blinks with CB red "POWER OK" LED. Appliance starts in freeze cycle
after a freeze-time correction cycle. Toreset CB LEDs, press ALARM RESET button on
CB with power on. CB resets LEDs and appliance continues cycle without interruption.

1) Freeze Time Differential Initiation: CB starts monitoring freeze times on the second
freeze time. After 3freeze cycles (4th total), CBbegins to compare minimum and
maximum freeze time cycles. Every freeze cycle time after the rst freeze cycle
time is added to the freeze time list. Minimum and maximum freeze time differential
comparisons begin on the third cycle and are monitored up to 10cycles. On the 11th
cycle the rst freeze cycle time is dropped to maintain the 10 maximum number of
cycles.
Example: After 8 cycles (excluding rst cycle), if the differential between the
shortestcycle (minimum) and the longest cycle (maximum) is equal to or greater than
427 sec. a freeze-time correction cycle is initiated:

Number of
Freeze Cycles

3 254
4 309
5 349
6 380
7 406
8 427
9 446

10 462

Differential
Value in Sec.

22

2) Freeze-Time Correction Sequence:
First occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Second occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. If not reset, CB "POWER OK" LED continues blinking. If reset
from rst occurrence, CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Third occurrence within 36 hr. minimum and maximum freeze times have exceeded
differential parameters. CB yellow "EXT HARVEST" LED starts blinking. Also, If not
reset, CB "POWER OK" LED continues blinking. If reset, CB "POWER OK" LED starts
blinking. Freeze-Time Correction Cycle starts.
Total freeze-time correction cycle last for 90min. At the end of 80min., the nal step
initiates and nal Harvest Pump Time (Harvest Assist) with WV2 (10-min.) starts. Once
the nal Harvest Pump Time (Harvest Assist) with WV2 (10-min.) terminates
(90 min. complete), normal freeze cycle begins.

2a) 10-Min. Harvest Pump Time (Harvest Assist) with WV2: CB "POWER OK" LED

blinking. CB LEDs 1, 4, 3, and 2 are on and Comp, FMRs, HGVs, PM, and WV2
energize. 10-min. timer starts. Once 10-min. timer terminates, CB LEDs 1, 3, and 2 turn
off and Comp, FMRs, HGVs, WV2 and PM de-energize. WV1 energizes.

2b) 10-Min. Fill: CB LED 4 on and WV1 energized. 10-min. timer starts.

2c) Final 10-Min. Harvest Pump Time (Harvest Assist) with WV2: CB "POWER OK"

LED blinking. Once 10-min. timer terminates, CB LEDs 1, 4, 3, and 2 are on and
Comp, FMRs, HGVs, PM and WV2 energize. 10-min. timer starts. Once 10-min. timer
terminates, normal freeze cycle begins. CB LED 1 on and Comp, FMRs, and PM
continue. HGVs and WV2 de-energize.

Note: After 3rd Freeze-Time Correction Cycle in 36 hours, CB signals with blinking CB

yellow "EXT HARVEST" LED. Appliance continues normal operation.
CB "POWER OK" LED and CB yellow "EXT HARVEST" LED continue blinking in
normal operation sequence.

3) Appliance Cycle Reset and CB Alarm Reset:
Cycle Reset: Power supply or control switch turned off and on again: Appliance turns
off, then re-starts at 1.Fill Cycle.
Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time correction
cycle with power supply on: Appliance continues cycle with no interruption or reset.
CB red "POWER OK" LED blinking: CB red "POWER OK" LED resets to solid.
CB yellow "EXT HARVEST" LED blinking: CB yellow "EXT HARVEST: LED turns off.

Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;

CV–check valve; FMRs–fan motors remote; FS–oat switch; HGVs–hot gas valves;
HM–headmaster (C.P.R.); HPS–high-pressure switch; LLVs–liquid line valves;
MC–magnetic contactor; PM–pump motor; TXV–thermostatic expansion valve;
WV1–ll/re-ll water valve; WV2–harvest water valve

23

D. Control Board Check

Before 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.

Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB

while CB is beeping. WARNING!Risk of electric shock. Care should be
taken not to touch live terminals. Once reset, the icemaker starts at the
1-minute ll cycle. For audible alarm information, see "III.B. LED Lights and
Audible Alarm Safeties."

1) Check the dip switch settings to assure that S4 dip switch 3, 4, 6, 7, 8, 9, 10 and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, and 5 are
cleaning adjustments and the settings are exible. For factory default settings, see
"III.C.1. Default Dip Switch Settings."

2) Move the control switch to the "ICE" position. If the red "POWER OK" LED is on, control
voltage is good, continue to step 3. If the "POWER OK" LED is off, check CT secondary
circuit. CT output is 10.5VAC at 115VAC primary input. If the secondary circuit has
proper voltage and the red LED is off, replace CB.

If the secondary circuit does not have proper voltage, check CT primary circuit. Check

for 115VAC at CB K1 connector pin #10 (BR) to neutral (W) for 115VAC. Always choose
a white (W) neutral wire to establish a good neutral connection when checking voltages.
For additional checks, see "II.I.1. No Ice Production."

3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control
switch is in the "ICE" position, then press the "OUTPUT TEST" button. For the correct
lighting sequence, see the table below. Note that the order of the LEDs from the outer
edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) cycle during the
test.

Control

Board

Correct LED

Lighting Sequence

1, 4, 3, 2

Following the test, the icemaker begins operation at the 1-minute ll cycle for both.
If the LEDs do not light as described above, replace CB.

24

4) To verify voltage output from CB to the components, slide the CB K1 connector out far
enough to allow multimeter lead contact. With the icemaker in the cycle to be tested,
check output voltage from the corresponding pin on CB K1 connector to a neutral
(W)wire. If output voltage is not found and the appropriate LED is on, replace CB.

5) Check CB control connectors K3, K4, and K5 for correct VDC per table below.
Note: Pin #1 is DC ground (GND) on each connector.

K3 Thermistor

Pin # VDC

#1 to #2 5VDC

#1 to #3 5VDC

#2 to #3 0VDC

K4 Bin Control

Pin # VDC

#1 to #2 5VDC

#1 to #3 5VDC

#2 to #3 0VDC

Legend: CB–control board; CT–control transformer

CB

Thermistor

Bin Control

Float Switch

3

1

K3

3

RED WHITE

1

K4

3

BLACK

1

K5

K5 Float Switch

Pin # VDC

#1 to #2 1.2VDC

#1 to #3 2VDC

#2 to #3 1.2VDC

25

E. Bin Control Check

1. Bin Control Check

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

To check BC, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Remove the control box cover.

4) Remove the base cover and clear any ice away from BC.

5) Disconnect BC connector from CB K4 connector.

BC Connector

6) Check for continuity across the wires of
BC connector. When the actuator paddle is

Bin Control
Bracket

not engaged, BC switch is closed. Ifopen,
check that the actuator paddle is not
sticking. Clean if necessary. See "II.E.2. Bin
Control Cleaning." If BC switch still reads
open, replace BC.

7) Press and hold the actuator paddle;
check for continuity across the wires

BC

of BC connector. When the actuator
paddle is engaged, BC switch is open.
If closed, check that the actuator paddle
is not restricted. Clean if necessary. See
"II.E.2.Bin Control Cleaning." If BC switch
still reads closed, replace BC.

Actuator
Paddle

Fig. 1

8) Reconnect BC connector to CB K4 connector, then move the control switch to the "ICE"
position. Turn on the power supply.

9) Check that CB green "BC CLOSED" LED is on.

10) Allow the icemaker to cycle on. Press and hold the actuator paddle. CB yellow
"BCOPEN" LED should turn on and the icemaker should shut down according to the
chart below. If it does not, replace CB.

Cycle at Bin
Control Activation

Fill Cycle 15 sec. after activation.

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

Freeze Cycle 15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle

Shutdown

end of the harvest cycle.

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

Legend: BC–bin control; CB–control board

26

2. Bin Control Cleaning

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

WARNING

CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispenser unit/storage bin.

1) Turn off the power supply.

2) Remove the front panel, then move the
control switch to the "OFF" position.

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

4) Disconnect BC connector from CB K4
(red) connector, then remove BC from the
icemaker.

5) Remove the actuator paddle from the
switch mount. See Fig. 2.

6) Wipe down BC with a mixture of 1 part
Hoshizaki "Scale Away" and 25 parts warm
water. 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 BC connector to CB K4 (red)
connector.

Bin Control Proximity
Switch Closed
(calling for ice)

To Control Board
K4 (red) Connector

Bin Control

Proximity Switch

Actuator Paddle

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

9) Move the control switch to the "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.

Actuator Paddle

27

Switch Mount

Magnet

Fig. 2

F. Float Switch Check and Cleaning

F/S is used to determine that there is sufficient water in the water tank after the 1-minute
ll cycle and after each harvest cycle. F/S is also used to determine that the appropriate
volume of water has been converted into ice before switching out of the freeze cycle. No
adjustment is required. Note: F/S is not part of rell operation.

1. Float Switch Check

To check F/S, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel.

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

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

5) Turn off the power supply.

6) Remove the front panel, then move the control switch to the "OFF" position.

7) Remove the top and right side panels.

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

9) Check for continuity across F/S leads. With the water tank empty, F/S should be open.
If open, continue to step 10. If closed, follow the steps in "II.F.2. Float Switch Cleaning."
After cleaning F/S, check it again. Replace if necessary.

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

11) Move the control switch to "ICE" position. Replace the front panel.

12) Turn on the power supply.

13) As water lls the water tank, F/S contacts should close. After 1 minute, the 1-minute ll
cycle should end and the initial harvest cycle should begin.

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

15) Remove the front panel, then move the control switch to the "OFF" position.

16) Remove the top and right side panels.

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

18) Check for continuity across F/S leads. With the water tank full, F/S should be closed.
If F/S is closed and the icemaker will not switch from the 1-minute ll cycle to the initial
harvest cycle, replace CB.

19) If open, conrm that the water tank is full. If the water tank is not full, check the water
supply, water lters, and ll/rell water valve. If the water tank is full, follow the steps in
"II.F.2. Float Switch Cleaning." After cleaning F/S, check it again. Replace if necessary.

28

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

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

22) Replace the front panel in its correct position.

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

Legend: CB–control board; F/S–oat switch

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on F/S. Scale can cause F/S to
stick. In this case, F/S should be cleaned.

1) Turn off the power supply.

2) Remove the front panel.

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

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

5) Turn off the power supply.

6) Remove the front, top, and right side panels, then move the control switch to the "OFF"
position.

7) Disconnect the vent tube and the ush tube from the top of F/S housing, then remove
F/S assembly. Remove the rubber boot from the bottom of F/S assembly. See Fig. 3.

8) Remove the retainer rod from the bottom of F/S assembly, then remove the oat. Be
careful not to bend the retainer rod excessively when removing it.

9) Wipe down F/S assembly's housing, shaft, oat, and retainer rod with a mixture of 1 part
Hoshizaki "Scale Away" and 25 parts warm water. 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 vent tube and the
ush tube.

11) Replace the right side and top panels in

Flush Tube

Vent Tube

their correct positions.

12) Move the control switch to the "ICE"

Shaft

position.

13) Replace the front panel in its correct

Float Switch
Housing

position.

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

Legend: CB–control board; F/S–oat switch

29

Fig. 3

Rubber Boot
and Hose

Float

Retainer Rod

G. Thermistor Check

To check thermistor resistance, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

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 thermistor connector from CB K3 (white) connector and check
resistance between thermistor leads. Normal range is 4.7 to 6.2 kΩ. If outside the
normal range, replace the thermistor. See "IV.B. Component Service Information."
If within the normal range, continue to next step.

7) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."

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

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

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

11) Replace the front panel in its correct position.

12) Turn on the power supply.

13) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.

14) 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, replace CB.

Legend: CB–control board; Comp–compressor

Thermistor Lead Cable Tie

Foam Insulation Thermistor Holder

Fig. 4

30

H. Switches

Two control switches are used to control operation. These switches are referred to as the
control switch" and the "service switch" and are located on the control box.

1. Control Switch

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

position does not de-energize all components.

2. Service Switch

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

Note:

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

2. When the control switch is in the "OFF" position or in the "ICE" position, the
service switch has no power and can be left in any position.

a) DRAIN

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

b) CIRCULATE

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

c) WASH

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

31

I. Diagnostic Tables

Before consulting the diagnostic tables, check for correct installation, proper voltage per
nameplate, and adequate water pressure (10 to 113 PSIG). Check control board using the
steps in "II.D. Control Board Check."

1. No Ice Production

No Ice Production - Possible Cause

1. Power Supply a) Off, blown fuse, or tripped breaker.

b) Not within specications.

2. Main Transformer
(3 phase SRK)
(208-230VAC/115VAC)

3. Water Supply a) Water supply off or improper water pressure.

4. Fuse (SRK Control Box) a) Blown.

5. High-Pressure Switch (SRK) a) Dirty condenser.

6. Discharge Line Thermostat
(SRK)

7. Wire Harness
(From SRK to KMS)

8. Fuse (KMS Control Box) a) Blown.

9. Control Switch a) In "SERVICE" or "OFF" position.

10. Control Transformer
(115VAC/10.5VAC)

11. Control Board
See "II.D. Control Board Check"

12. Bin Control
See "II.E. Bin Control Check"

13. Fill/Rell (WV1) or
Harvest Water Valve (WV2)

a) Voltage tap switch not set to proper voltage.

b) No neutral. White (W) wire to ground 0VAC. (White (W) wire to

ground should be 60VAC).

b) External water lters clogged.

b) Condensing unit fan(s) not operating.

c) Headmaster (C.P.R.) open.

d) Refrigerant overcharged.

e) Bad contacts.

f) Refrigerant lines or components plugged.

a) Ambient temperature too warm.

b) Compressor or compressor components defective.

c) Defective.

d) Hot gas valve(s) open.

e) Dirty condenser.

f) Condensing unit fan(s) not operating.

a) Disconnected or loose connection.

b) Bad contacts.

a) Coil winding open or shorted.

a) In alarm.

b) Yellow "BC OPEN" LED on: Bin full.

c) Defective.

a) Tripped with bin lled with ice.

b) Actuator does not move freely.

c) Defective.

a) Screen or orice clogged.

b) Coil winding open.

c) Water valve open in freeze cycle.

32

No Ice Production - Possible Cause

14. Float Switch
See "II.F. Float Switch Check and
Cleaning"

15. Compressor a) Magnetic contactor contacts bad or coil winding open.

16. Hot Gas Valves (KMS & SRK) a) Closed in harvest cycle.

1 7. Thermistor

See "II.G. Thermistor Check"

18. Pump Motor a) Motor winding open.

19. Thermostatic Expansion Valve a) Bulb loose.

20. Liquid Line Valves (KMS & SRK) a) Closed in freeze cycle.

2 1. Fan Motors-Remote a) Motor winding open.

22. Headmaster a) Defective.

23. Water System a) Water leaks causing short freeze time.

a) Float does not move freely.

b) Defective.

b) Start capacitor or run capacitor defective (1 phase SRK).

c) Start relay contacts bad or coil winding open

(1 phase SRK).

d) Internal protector open.

e) Compressor defective.

b) Open in freeze cycle.

a) Loose, disconnected, or defective.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

b) Operating erratically.

b) Open in harvest cycle.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

33

2. Freeze-Up

Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up
checklist. See "II.J. Freeze Up Check List," the Hoshizaki America Technician's Pocket
Guide, or contact your local distributor for a copy of the freeze-up checklist.

Freeze-Up - Possible Cause

Harvest Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Cube Guides a) Out of position.

b) Damaged.

3. Spray Tubes, Spray Guides, and
Splash Guard or Splash Curtain

4. Water Supply a) Low water pressure.

5. Harvest Water Valve (WV2) a) Defective.

6. Float Switch
See "II.F. Float Switch Check and
Cleaning"

7. Refrigerant Charge a) Low.

8. Control Board
See "III. Controls and
Adjustments" and "II.D. Control
Board Check"

9. Bin Control
See "II.E. Bin Control Check"

10. Thermistor
See "II.G. Thermistor Check"

11. Thermostatic Expansion Valve a) Defective.

12. Hot Gas Valves (KMS & SRK) a) Closed or restricted.

13. Liquid Line Valves (KMS & SRK) a) Open.

1. Evaporator a) Scaled up.

2. Spray Tubes, Spray Guides, and
Splash Guard or Splash Curtain

3. Refrigerant Charge a) Low.

4. Control Board
See "II.D. Control Board Check"

5. Fill/Rell (WV1) or
Harvest Water Valve (WV2)

6. Float Switch
See "II.F. Float Switch Check and
Cleaning"

7. Pump Motor a) RPM too slow.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 3/8" nominal ID copper water tubing or equivalent.

a) Float does not move freely.

b) Defective.

a) Harvest timer (S4 dip switch 1 & 2) set too short.

b) Harvest pump timer (S4 dip switch 7) not in factory default position.

c) Defective.

a) Bulb out of position.

b) Defective.

a) Loose, disconnected, or defective.

Freeze Cycle

b) Damaged.

a) Dirty.

b) Out of position.

a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.

b) Defective.

a) Leaking by.

a) Float does not move freely.

b) Defective.

b) Impeller damaged.

34

Freeze-Up - Possible Cause

8. Thermostatic Expansion Valve a) Bulb loose or defective.

9. Headmaster a) Defective.

10. Liquid Line Valves (KMS & SRK) a) Restricted.

3. Low Ice Production

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up.

2. Spray Tubes, Spray Guides, and
Splash Guard or Splash Curtain

3. Refrigerant Charge a) Low.

4. Water Supply a) Low water pressure.

5. Control Board
See "II.D. Control Board Check"

6. Thermistor
See "II.G. Thermistor Check"

7. Hot Gas Valves (KMS & SRK) a) Erratic or closed.

8. Harvest Water Valve (WV2) a) Screen or orice clogged.

9. Compressor a) Inefficient or off.

10. Liquid Line Valves (KMS & SRK) a) Erratic or open.

11. Thermostatic Expansion Valve
(TXV)

12. Headmaster a) Defective.

1. Evaporator a) Scaled up, dirty.

2. Float Switch
See "II.F. Float Switch Check and
Cleaning"

3. Fill/Rell (WV1) or
Harvest Water Valve (WV2)

4. Hot Gas Valves (KMS & SRK) a) Erratic or open.

5. Condenser a) Clogged.

6. Control Board
See "II.D. Control Board Check"

7. Refrigerant Charge a) Low.

8. Thermostatic Expansion Valve
(TXV)

9. Compressor a) Inefficient or off.

10. Pump Motor a) RPM too slow.

11. Liquid Line Valves (KMS & SRK) a) Erratic or restricted.

12. Headmaster a) Defective.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 3/8" nominal ID copper water tubing or equivalent.

d) Too cold.

a) Thermistor connection loose (K3).

b) Defective.

a) Loose, disconnected, or defective.

a) Defective.

Long Freeze Cycle

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

a) Leaking by.

a) Float switch connection loose (K5).

b) Defective.

a) Bulb loose.

b) Defective.

35

J. Freeze-Up Check List

Freeze-Up Check List

Please Complete When Diagnosing a Freeze-Up, Refrigerant Leak, or Low Charge

Technical Support Fax #: [phone]

Make Copies And Use As Needed

Model #___________________________ Serial # _________________________Install Date______________Fail Date___________

List model and manufacture of bin or dispenser__________________________.

Date appliance was last cleaned:__________.

Freeze-Up Defrost

YES NO
[ ] [ ] 1) After defrosting, was the appliance leak

checked?

[ ] [ ] 2) Were any leaks found?

If so where?_____________________.

[ ] [ ] 3) Was any refrigerant added to the unit?

If so, how much?_________________.

Set Up

[ ] [ ] 4) Is the appliance stacked?
[ ] [ ] 5) Is water line independent?
[ ] [ ] 6) Is water line correct size? If not________”.

3/8" Nominal ID Copper Water Tubing or
Equivalent.

7) What is water pressure?___________.
Water Temperature_________.

[ ] [ ] 8) Does appliance have any water ltration?

If yes please list the following:
Filter brand___________________.
Model________________.
Filter pressure gauge reading during the ll
cycle___________.
Date lter was last
replaced?__________________________.
GPM or LPM ow rate of lter
system?__________________.

9) Ambient temperature at appliance?
______________.

At remote condenser (if applicable)?________.

Appliance Status

[ ] [ ] 10) Is the appliance and/or oat switch dirty?

11) List the S4 (1-10) and S5 (1-5) DIP switch
settings.

S4: 1___2___3___4___5___6___7___8___9___10____
S5: 1_____2_____3_____4_____5______
[ ] [ ] 12) Is DIP switch number 7 ON (harvest pump

time (harvest assist) all models and freeze-time
correction models with control board

2A7664-02?
[ ] [ ] 13) Is the cube guide positioned correctly?
[ ] [ ] 14) Are the evaporator separators positioned

properly?
[ ] [ ] 15) Is the thermistor properly mounted, tight, and

insulated?
[ ] [ ] 16) Is the TXV bulb properly mounted, tight, and

insulated?

Appliance Operation

Fill
YES NO
[ ] [ ] 17) Does the water tank ll and overow?

60-90 sec. Note: Larger models may take up to

120 seconds to overow when empty.
[ ] [ ] 18) If NO in step 17, is water ow 5GPM for larger?
[ ] [ ] 19) Does the appliance utilize re-ll (S5 dip switch

2and 3)?

Harvest
[ ] [ ] 20) Is the hot gas valve opening?
[ ] [ ] 21) Is harvest pump time (harvest assist) utilized

(S4dip switch 7)?
[ ] [ ] 22) Is hot gas valve opening in harvest?
[ ] [ ] 23) Does water valve close completely when

de energized?

24) What was length of harvest?___________.

Freeze
[ ] [ ] 25) Is pump motor energized in freeze cycle except

during 10-sec. anti-slush. If activated (S5 dip

switch 5 on)?

26) Water-cooled condenser outlet temperature
5-min. into freeze? ______________°F.

27) What was length of freeze?____________.

[ ] [ ] 28) Is the cube size consistent from inlet to outlet of

evaporator?

[ ] [ ] 29) Is ice still dropping when next freeze cycle starts?

30) What is the ice drop weight?___________.

31) What is head pressure?
Freeze_________Harvest_______.
(Freeze pressure should be taken 5 minutes into
the cycle).

32) What is suction pressure?
Freeze______Harvest_______.
(Freeze pressure should be taken 5 minutes into
the cycle).

[ ] [ ] 33) When activating bin control, did appliance

shutdown within 15seconds in the rst 5minutes
of freeze cycle?

Freeze-Time Correction Operation

[ ] [ ] 34) Has Freeze-Time Correction been activated?

("POWER OK" LED blinking).

[ ] [ ] 35) Has more than 1 Freeze-Time Correction been

activated?
(POWER OK" LED and "EXT HARVEST" LED
blinking).

Note: Make copies of this form and use it when diagnosing a freeze up condition. Submit a completed copy of the checklist

along with the freeze-up labor claim form.

36

III. Settings and Adjustments

• 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 "II.D. 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.

37

A. Control Board Layout

• Bin Control Switch
Closed LED (green)

• "ALARM RESET" Button

"J" Control Board

• S4 Dip Switch

• "OUTPUT TEST" Button

(used to test relays on control board)

• Bin Control Switch
Open LED (yellow)

• Alarm Buzzer

• Ext. Harvest
LED (yellow)

(blinks when
3rd occurrence
of freeze time
correction initiates
within 36 hr.)

• POWER OK 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
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

• K3 (white) Connector

Thermistor
(harvest control and
high temperature safety)

• K4 (red) Connector

Bin Control

• S5 Dip Switch

• K5 (black) Connector

Float Switch
(water level)

• Part Number

• K1 Connector

Pins #1 through #10
#1, 9 Magnetic Contactor, X13 Relay
#2 Hot Gas Valves, X10 Relay
#3 Liquid Line Valves
#4 Pump Motor
#5 X11 Relay
(harvest pump timer and
pump-out)
#6 Fill/Rell water valve (WV1),
Harvest water valve (WV2),
X12 Relay
#7, 10 Component Power Supply
#8 Open

• K2 Connector

Control Transformer
(10.5VAC)

"J" Control Board

Part Number 2A7664-02

38

B. LED Lights and Audible Alarm Safeties

Beep occurs and red CB "POWER OK" LED turns on when control switch is moved to
"ICE" position.

Sequence

Green LEDs 1 through 4 turn on and sequence from initial startup as listed in the table
below. Order of green LEDs from the outer edge of control board is 1, 4, 3, 2.

Sequence Step LED

1-Minute Fill Cycle 4 WV
Harvest Cycle 1, 4, 2 Comp, FM*, FMRs, HGVs, WV1/WV2 1 minute 20 minutes
Harvest Pump Time

(harvest assist)
Freeze Cycle 1 Comp, FM/FMRs, PM, LLV 5 minutes freeze timer

Anti-Slush Control 1, 3 Comp, FM/FMRs, LLV If S5 dip switch 5 on,

Pump-Out Cycle 1, 4
*FM energized if on K1 Connector Pin #9;

1, 3, 2 Comp, FM*, FMRs, HGVs, PM 0 seconds 50 seconds

†

, 3, 2 Comp, FM*, FMRs, WV †, PM, HGVs, DV 10 seconds 20 seconds

†

pump-out timer setting

Energized

Components

Time LEDs are On

Min. Max.

setting

PM off 10 sec. when
thermistor at 36°F (2.2°C)

Alarms

Type Alarm Notes

1

Beep

2

Beep

3

Beep

LED Blink Freeze-Time Correction

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

6 Low Voltage

7 High Voltage

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

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

Freeze Timer
(freeze > freeze timer setting
for two cycles in a row)

(maximum freeze time
differential exceeded)

(92Vac±5% or less)

(147Vac±5% or more)

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

Check thermistor (open), HGV not opening,
TXV or LLV leaking by, low charge, inefficient Comp,
or WRV leaking by.

Check FS stuck closed (up), WV leaking by, HGV leaking
by, PM not pumping, TXV defective, LLV not opening, low
charge, HMnot bypassing, or inefficient Comp.

RED POWER OK LED blinks.
After 3rdfreeze-time correction cycle in 36hours starts
CByellow "EXT HARVEST" LED blinking.
Fill out freeze-up checklist.

Red LED turns off if voltage protection operates.
Control voltage safeties automatically reset when voltage
is corrected.

Legend: Comp–compressor; FM–fan motor; FMR–fan motor remote; FS–oat switch;

HGV–hot gas valve; HM–headmaster (C.P.R.); L LV –liquid line valve; PM–pump
motor; TXV–thermostatic expansion valve; WRV–water regulating valve;

WV1–ll/re-ll water valve; WV2–harvest water valve

Test

To perform output test, move control switch to "ICE" position. Press "OUTPUT TEST" button.
Correct green LED lighting sequence is 1, 4, 3, 2. Components (e.g., compressor) cycle
during test. Following test, icemaker resumes operation.

Dip switches must be adjusted per unit’s service manual or Hoshizaki Technical Support
recommendation. S4 dip switch 8 must remain off.

39

C. Settings and Adjustments

NOTICE

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

1. Default Dip Switch Settings

The 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-1402MLJ\3 OFF OFF OFF ON ON ON ON OFF OFF OFF

S5 Dip Switch (Do Not Adjust)

Dip Switch No.

KMS-1402MLJ/3 ON ON OFF OFF OFF

1 2 3 4 5

S4 Dip Switch

ON

Freeze Timer (9 & 10)

Factory Use (8)
Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (7)
(Do Not Adjust)

Harvest Pump Time (Harvest Assist Duration) (6)
(Do Not Adjust)

Pump-Out Frequency Control (5)

Pump-Out Time/Harvest Time During Pump-Out (3 & 4)

1 2 3 4 5 6 7 8 9 10

Harvest Time (1 & 2)

S5 Dip Switch

Do Not Adjust

Anti-Slush (5)

Minimum Harvest Time (4)

Rell Counter (2 and 3)

ON

1 2 3 4 5

Float Switch Selector (1)

40

2. Harvest Time (S4 dip switch 1 & 2)

The harvest timer starts counting when the thermistor reaches 48°F (9°C) at the
evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The harvest
timer is factory set, and generally no adjustment is required. However, a setting longer
than the factory setting may be advised in cases where the drain provided at harvest
needs to be prolonged for extra cleaning. Note that 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
"III.C.3. Pump-Out Timer (S4 dip switch 3& 4)."

Note: On models with a pump-out every cycle, the harvest timer is only relevant during

the initial harvest cycle since a pump out occurs every cycle thereafter.

Time

S4 Dip Switch Setting

No. 1 No. 2 S5-4 OFF S5-4 ON

OFF OFF 60 30

ON OFF 90 45

OFF ON 120 60

ON ON 180 75

(sec.)

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)

NOTICE

Do not adjust 3 off and 4 on. Drain valve does not energize in this setting.

When a pump-out is called for, the pump motor stops for 2 sec. After 2 sec. the drain
valve and pump motor energize. Water is removed from the bottom of the water tank
and sent down the drain. 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, and generally no adjustment
is required. However, where water quality is bad and the icemaker needs a longer
pump-out time, the pump-out timer can be adjusted. The pump-out timer control can be
set to pump-out for 10 or 20 sec.

S4 Dip Switch Setting Time (sec.)

T1 T2

No. 3 No. 4

OFF OFF 10 150 100 Closed Closed

ON OFF 10 180 130 Closed Closed

OFF ON 10 120 70 Open Closed

ON ON 20 180 180 Closed Closed

T1: Time to drain the water tank
T2: Harvest timer at pump out

S5-4 OFF S5-4 ON S5-4 OFF S5-4 ON

Fill/Rell Water

Valve

41

4. Pump-Out Frequency Control (S4 dip switch 5)

The pump-out frequency control is factory set to drain the water tank every 10 cycles.
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 can be set to have a pump-out occur every cycle, or every
10 cycles.

The rst pump-out is dependent on S4 dip switch 5. See the table below.

S4 Dip Switch Setting

No. 5

OFF Every 10 cycles After 11th freeze cycle

ON Every cycle After 2nd freeze cycle

Pump-Out Frequency 1st Pump-Out

5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6)

NOTICE

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

Harvest pump time (harvest assist duration) is controlled by S4 dip switch 6 and S5 dip
switch 4. See table below. Harvest pump time (harvest assist duration) is only active
when S4 dip switch 7 is in the "ON" position. In the factory default position, the harvest
pump time (harvest assist duration) starts with 50sec. left to go in harvest cycle
(S4 dip switch 6) and after the thermistor reaches 48°F (9°C) at the evaporator outlet and
the control board reads 3.9kΩ from the thermistor. The harvest pump time
(harvest assist duration) is factory set, and no adjustment is required.

Harvest Pump Time

S4 Dip Switch Setting

No. 6 S5-4 OFF S5-4 ON

OFF 50 sec. 25 sec.

ON 25 sec. 15 sec.

(Harvest Assist)

42

6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)

NOTICE

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

a) Depending on the harvest pump timer setting, the pump motor either stays off or is

energized the last 50 seconds of harvest. When the pump motor is energized, water
circulates over the evaporator. The harvest water valve (WV2) and X12 relay are
energized 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 the harvest water valve (WV2), 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
during harvest pump timer. See "VIII.B. Wiring Diagram."
50 seconds before harvest termination, LED 4 goes off de-energizing WV2 (harvest
water valve) and X12 relay. X13 relay remains energized through the holding circuit
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 is energized the last
50seconds of harvest.

b) Freeze-Time Correction

When S4 dip switch 7 is in the on position, freeze-time correction enabled.
See "II.C. Freeze-Time Correction Cycle (90 min.)."

S4 Dip Switch Setting Harvest Pump

Time (sec.)

No. 7

OFF 0 Disabled

ON 50 Enabled

(Harvest Assist)

Freeze-Time

Correction

7. Factory Use (S4 dip switch 8)

Factory set for proper operation. Do not adjust. This must be left in the factory default
position.

43

8. Freeze Timer (S4 dip switch 9 & 10)

NOTICE

Adjust to proper specication, or the icemaker may not operate correctly.

The freeze timer setting determines the maximum allowed freeze time to prevent possible
freeze-up issues. Upon termination of the freeze timer, the control board initiates the
harvest cycle or pump-out cycle. After 2 consecutive freeze timer terminations, the
control board shuts down the icemaker. In this case, see "II.I.3. Low Ice Production"
for possible solutions. The freeze timer is factory set and no adjustment is required.
Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for
recommendations.

S4 Dip Switch Setting Time

No. 9 No. 10

OFF OFF 60

OFF ON 50

ON OFF 70

ON ON 75

9. Float Switch Control Selector (S5 dip switch 1)

(min.)

NOTICE

Do not adjust. This must be left in the factory default position or the icemaker will
not operate correctly.

Float switch selector used in applications where rell is required in the freeze cycle.
Rells set by S5 dip switch 2 and 3. Note: In single oat switch with upper oat operation
only 1 rell allowed. (reword).

• Single oat switch application:

• With S5 dip switch 1 in the "OFF" position, control board monitors the lower oat switch for
rell operation.

• With S5 dip switch 1 in the "ON" position, the control board monitors the upper oat switch
for rell operation. In this case no upper oat switch exists, therefore the control board
reads an open upper oat switch immediately when the freeze cycle starts and initiates a
rell. Since there is no upper oat switch to close and terminate the rell, the rell lasts for
a maximum of 1-min. During the 1-min. rell, LED 4 is on.

• Double oat switch application: Float switch control selector determines which oat

switch (upper or lower) the control board monitors for rell control during the freeze
cycle.

S5 Dip Switch Setting

OFF Lower Float Switch Enabled

ON

Upper or Lower Float Switch

ControlNo. 1

Upper Float Switch Enabled

(this setting is ignored if rell counter

(S5 dip switch 2 and 3) set to 0)

44

10. Rell Counter (S5 dip switch 2 and 3)

NOTICE

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

The rell counter determines the number of rells. The KMS-1122MLH does not rell
during the freeze cycle.

S5 Dip Switch Setting Rell

No. 2 No. 3

OFF OFF 0

OFF ON 1 rell

ON OFF 9 rells

ON ON 10 rells

Counter

11. Minimum Harvest Time (S5 dip switch 4)

NOTICE

Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may result in damage to the appliance.

S5 Dip Switch Setting Minimum

No. 4

OFF 120 sec.

ON 70 sec.

Harvest Timer

12. Anti-Slush (S5 dip switch 5)

NOTICE

Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may result in damage to the appliance.

This dip switch setting provides anti-slush control during the freeze cycle. When the
evaporator temperature reaches 36°F (2.2°C) the control board reads a 5.8kΩ signal
from the thermistor and de-energizes the water pump for 10 sec. to melt ice slush and
prevent ice slush from blocking the water supply tubing, causing irregular freeze patterns.

S5 Dip Switch Setting

Anti-SlushNo. 5

OFF Disabled

ON Enabled

45

IV. Refrigeration Circuit and Component Service Information

WARNING

• This appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• Move the control switch to the "OFF" position and turn off the power supply. Place
the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply
from being turned back on inadvertently.

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

• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are
clean after service.

A. Refrigeration Circuit Service Information

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certied service personnel.

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

NOTICE

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

• Do not leave the system open for longer than 15 min. when replacing or servicing
parts. The Polyol Ester (POE) oils used in R-404A applications can absorb
moisture quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.

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

• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).

1. Refrigerant Recovery

The condensing unit and icemaker are provided with refrigerant shutoff valves. Using
proper refrigerant practices, recover the refrigerant. Recovery via the condensing unit's
refrigerant shutoff valves is recommended. Store the refrigerant in an approved container.
Do not discharge the refrigerant into the atmosphere.

46

2. Brazing

WARNING

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

• R-404A itself is not explosive or poisonous. However, when exposed to high
temperatures (open ames), R-404A can be decomposed to form hydrouoric
acid and carbonyl uoride both of which are hazardous.

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

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.
Note: Because the pipes in the evaporator case are specially coated to resist corrosion,

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

NOTICE

• Always install a new drier every time the sealed refrigeration system is opened.

• Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).

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

3. Evacuation and Recharge (R-404A)

The condensing unit and icemaker are provided with refrigerant shutoff valves.
Evacuation and recharge via the condensing unit's refrigerant shutoff valves is
recommended.

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

IMPORTANT

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

2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the
vacuum pump to ow backwards.

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.

47

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

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. For the required refrigerant charge, see the rating label inside the icemaker.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets
ARI Standard 700 (latest edition) be used.

6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.

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

8) If necessary, add any remaining charge to the system through the low-side.

NOTICE!To prevent compressor damage, use a throttling valve or liquid
dispensing device to add the remaining liquid charge through the low-side
refrigerant access valve with the icemaker running.

9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold
hoses.

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

48

B. Component Service Information

NOTICE

When replacing a component listed below, see the notes to help ensure proper
operation.

Component Notes

Compressor 1 Phase SRK: Install a new start capacitor, run capacitor, and start relay.

3 Phase SRK: Install a new magnetic contactor.

Thermostatic
Expansion
Valves

Hot Gas Valves
Liquid Line
Valves

Fan Motors Install a new capacitor.

Pump Motor Install a new capacitor.

Thermistor • Attach the new thermistor to the suction line in the same location as the previous

• Attach the thermostatic expansion valve bulb to the suction line in the same location as
the previous bulb.

• The bulb should be between the 10 and 2 o'clock positions on the tube.

• Secure the bulb with the clamp and holder, then insulate it.

• Replace the strainer if applicable.

• Use copper tube of the same diameter and length when replacing valve lines.

thermistor.

• The thermistor should be at the 12 o'clock position on the tube.

• Smoothly ll the recessed area of the thermistor holder with high thermal conductive
type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound
10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu
Silicones), or equivalent are recommended.

• Secure the thermistor with the holder, then insulate it.

• Be very careful to prevent damage to the leads.

49

V. Maintenance

The maintenance schedule below is a guideline. More frequent maintenance may be
required depending on water quality, the appliance's environment, and local sanitation
regulations.

WARNING

• Only qualied service technicians should service the appliance.

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

• Before servicing: Move the control switch to the "OFF" position and turn off the
power supply. Place the disconnect in the "OFF" position.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after any maintenance is done to the icemaker. Make sure that
none have fallen into the dispenser unit/ice storage bin.

Maintenance Schedule

Frequency Area Task

Daily Scoop Clean the ice scoop using a neutral cleaner. Rinse thoroughly after

cleaning.
Bi-Weekly Air Filters Inspect. Wash with warm water and neutral cleaner if dirty.
Monthly External Water

Filters
Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a

Underside of
Icemaker and Top
Kits; Bin Door and
Snout

Yearly Icemaker and

Dispenser Unit/Ice
Storage Bin Liner

Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water

Condenser Inspect. Clean if necessary by using a brush or vacuum cleaner. More

Water Hoses Inspect the water hoses and clean/replace if necessary.

Check for proper pressure and change if necessary.

neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining

(rust colored spots) using a non-abrasive cleanser.

Wipe down with a clean cloth and warm water.

Clean and sanitize per the cleaning and sanitizing instructions provided

in the instruction manual or maintenance label on the icemaker.

system. Clean the water supply inlet screen.

frequent cleaning may be required depending on location.

50

VI. Preparing the Appliance for Periods of Non-Use

NOTICE

• When storing the appliance for an extended time or in sub-freezing temperatures,
follow the instructions below to prevent damage.

• To prevent damage to the water pump, do not operate the appliance with the
control switch in the "SERVICE" position when the water tank is empty.

When the appliance is not used for two or three days under normal conditions, it is sufficient
to move the control switch to the "OFF" position. When storing the appliance for an
extended time or in sub-freezing temperatures, follow the instructions below.

1) Turn off the power supply, then remove the front panel.

2) Move the control switch to the "OFF" position. Conrm that the service switch is in the
"CIRC." position.

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

4) Disconnect the thermistor connector from the control board K3 (white) connector, then
unplug the water pump connector at the water pump.

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

6) Once LED 1 and 2 on the control board energize (the order of the LEDs from the outer
edge of the control board is 1, 4, 3, 2), close the inlet water supply line shut-off valve
and open the inlet water supply line drain valve. Allow the line to drain by gravity.

7) Disconnect the harvest water valve (WV2) hose in the evaporator section and blow out
the water line to the harvest water valve (WV2) using compressed air or carbon dioxide.
See Fig.5. This will clear water from the harvest water valve (WV2).

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

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

10) Using the same hose as with the harvest water valve (WV2), blow out the wash valve
using compressed air or carbon dioxide.

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

12) Remove the 4 hoses connected to the water tank. Allow the water tank and hoses to
completely drain.

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

14) Using the ll/rell water valve (WV1) hose, blow out the water line using compressed air
or carbon dioxide. This will clear water from the ll/rell water valve (WV1).

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

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

51

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

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

19) Turn off the power supply.

20) Reconnect the thermistor connector to the control board K3 (white) connector.
Reconnect the water pump connector.

21) Close the inlet water supply line drain valve.

22) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage
bin liner using a neutral cleaner. Rinse thoroughly after cleaning.

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

Harvest Water Valve Hose

Harvest Water Valve (WV2)

Drain Hose Tee

Suction Hose

Wash Valve

Fill/Rell Water Valve Hose

Fill/Rell Water Valve (WV1)

Float Switch Flush Tube

Drain Valve

Fig. 5

52

VII. Disposal

This appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certied service personnel.

53

VIII. Technical Information

We reserve the right to make changes in specications and design without prior notice.

A. Specication and Performance Data Sheets

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

1. KMS-1402MLJ with SRK-15J

Specification Sheet

AC SUPPLY VOLTAGE 115VAC Supplied by SRK-15J via Factory Supplied

Wire Harness

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

ELECTRIC W (kWH/100 lbs.) 2510 (4.30) 2310 (3.70)

WATER gal./24HR (gal./100 lbs.) 294 (21.0) 642 (42.8)

ICE PRODUCTION PER CYCLE 26.4 lbs. (12 kg) 1248pcs.

BIN CONTROL SYSTEM Mechanical Lever Switch

REFRIGERANT CHARGE TOTAL R404A, 16 lb. 5 oz. (7400g)

ICEMAKER, 0 lb. 7.1 oz. (200g)

CONDENSER, 15 lb. 14 oz. (7200g)

Performance Sheet

APPROXIMATE ICE PRODUCTION PER 24
HR.

lbs./day kg./day
APPROXIMATE ELECTRIC CONSUMPTION

watts 100/38
APPROXIMATE WATER CONSUMPTION
PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min. 100/38
HARVEST CYCLE TIME

min. 100/38
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT

TEMP. (ºF/ºC)

70/21 1501 681

80/27 1478 671 1432 650 1269 576

90/32 1471 667 1400 635 1253 568

100/38 1421 644 1365 619 1117 507

70/21

80/27

90/32

70/21 642 2.43

80/27 565 2.14 406 1.54 1471 5.57

90/32 540 2.05 294 1.11 1190 4.51

100/38 716 2.71 504 1.91 2014 7.62

70/21

80/27

90/32

70/21

80/27

90/32

70/21 183 12.9

80/27 196 13.8 222 15.6 233 16.4

90/32 200 14.0 240 16.9 254 17.8

100/38 200 14.1 243 17.1 266 18.7

70/21 45 3.2 46 3.2 48 3.4

80/27 46 3.2 47 3.3 49 3.5

90/32 46 3.2 48 3.4 50 3.5

100/38 46 3.3 48 3.4 52 3.7

50/10 70/21 90/32

2310

2355 2446 2461

2369

2362 2516 2560

22

23 24 27

23

24 26 30

4.4

3.9 3.1 3.0

3.8

3.1 2.4

WATER TEMP. (ºF/ºC)

1471 667 1352 613

2369 2407

2510

540 2.05 1175 4.45

23 25

26

3.8 3.5

2.4

200 14.0 215 15.1

2536

28

2.2

2.0

TOTAL HEAT OF REJECTION FROM CONDENSER

TOTAL HEAT OF REJECTION FROM COMPRESSOR 3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

CONDENSER VOLUME 226 CU. IN (SRK-15J)

28,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

54

2. KMS-1402MLJ with SRK-15J3

Specification Sheet
AC SUPPLY VOLTAGE 115VAC Supplied by SRK-15J3 via Factory Supplied

Wire Harness
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2510 (4.55) 2340 (3.81)
WATER gal./24HR (gal./100 lbs.) 292 (22.0) 725 (49.2)
ICE PRODUCTION PER CYCLE 26.4 lbs. (12 kg) 1248pcs.
BIN CONTROL SYSTEM Mechanical Lever Switch
REFRIGERANT CHARGE TOTAL R404A, 16 lb. 5 oz. (7400g)

ICEMAKER, 0 lb. 7.1 oz. (200g)

CONDENSER, 15 lb. 14 oz. (7200g)

Performance Sheet
APPROXIMATE ICE PRODUCTION PER 24
HR.

lbs./day kg./day
APPROXIMATE ELECTRIC CONSUMPTION

watts 100/38
APPROXIMATE WATER CONSUMPTION
PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min. 100/38
HARVEST CYCLE TIME

min. 100/38
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT

TEMP. (ºF/ºC)

70/21 1474 669
80/27 1441 654 1373 623 1258 571
90/32 1430 649 1325 601 1217 552

100/38 1399 635 1300 589 1117 507

70/21
80/27
90/32

70/21 725 2.75
80/27 628 2.38 431 1.63 410 1.55
90/32 598 2.26 292 1.10 246 0.93

100/38 449 1.70 281 1.06 204 0.77

70/21
80/27
90/32

70/21
80/27
90/32

70/21 186 13.1
80/27 199 14.0 225 15.8 234 16.5
90/32 203 14.3 244 17.2 255 18.0

100/38 203 14.3 247 17.3 266 18.7

70/21 45 3.2 46 3.3 48 3.4
80/27 46 3.2 48 3.4 49 3.5
90/32 46 3.3 50 3.5 51 3.6

100/38 46 3.3 50 3.5 52 3.7

50/10 70/21 90/32

2340 2390 2429
2378 2455 2479
2390 2510 2541
2388 2517 2570

22 23 25
23 25 27
23 26 28
24 27 30

4.8 4.0 3.7

4.2 3.1 3.1

4.0 2.3 2.1

3.2 2.2 2.0

WATER TEMP. (ºF/ºC)

1430 649 1335 606

598 2.26 523 1.98

203 14.3 217 15.3

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME 226 CU. IN (SRK-15J3)

28,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

55

3. SRK-15J

Specification Sheet

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

(115VAC Supplied to KMS via Factory Wire Harness)
AMPERAGE 11.3 A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
EXTERIOR DIMENSIONS (WxDxH) 50-1/4" x 17" x 28" (1274 x 432 x 712 mm)
DIMENSIONS INCLUDING LEGS (WxDxH) 50-1/4" x 17" x 43" (1274 x 432 x 1092 mm)
EXTERIOR FINISH Galvanized steel
WEIGHT
CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

- REFRIGERATION Suction line - 5/8" Brazed Connections
CIRCUIT Liquid line - 1/2" Brazed Connections
COMPRESSOR Hermetic, Model CS16K6E-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 Condensing Pressure Regulator
REFRIGERANT CHARGE

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC

ACCESSORIES -SUPPLIED Legs and hardware

-REQUIRED

TOTAL HEAT OF REJECTION FROM CONDENSER 28,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME 226 CU. IN.

Net 230 lbs. (104 kg), Shipping 275 lbs. (125 kg)

SRK to KMS: Wire Harness Connection

TOTAL R404A, 16 lb. 5 oz. (7400g)

ICEMAKER, 0 lb. 7.1 oz. (200g)

CONDENSER, 15 lb. 14 oz. (7200g)

AMBIENT TEMP. (Outdoor use) -20-122°F

Compatible KMS icemaker, Water Filter (2) cartridge, Ice Dispenser or Ice Storage Bin

Line set HS-0250, HS-0244, HS-0245

56

4. SRK-15J3

Specification Sheet

AC SUPPLY VOLTAGE 208-230/60/3

(115VAC Supplied to KMS via Factory Wire Harness)
AMPERAGE 9.2 A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
EXTERIOR DIMENSIONS (WxDxH) 50-1/4" x 17" x 28" (1274 x 432 x 712 mm)
DIMENSIONS INCLUDING LEGS (WxDxH) 50-1/4" x 17" x 43" (1274 x 432 x 1092 mm)
EXTERIOR FINISH Galvanized steel
WEIGHT
CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection

- REFRIGERATION Suction line - 5/8" Brazed Connections
CIRCUIT Liquid line - 1/2" Brazed Connections
COMPRESSOR Hermetic, Model CS16K6E-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 Condensing Pressure Regulator
REFRIGERANT CHARGE

DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
OPERATING CONDITIONS VOLTAGE RANGE 187-253VAC

ACCESSORIES -SUPPLIED Legs and hardware

-REQUIRED

TOTAL HEAT OF REJECTION FROM CONDENSER 28,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR 3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME 226 CU. IN.

Net 230 lbs. (104 kg), Shipping 275 lbs. (125 kg)

SRK to KMS: Wire Harness Connection

TOTAL R404A, 16 lb. 5 oz. (7400g)

ICEMAKER, 0 lb. 7.1 oz. (200g)

CONDENSER, 15 lb. 14 oz. (7200g)

AMBIENT TEMP. (Outdoor use) -20-122°F

Compatible KMS icemaker, Water Filter (2) cartridge, Ice Dispenser or Ice Storage Bin

Line set HS-0250, HS-0244, HS-0245

57

B. Wiring Diagrams

1. Wire Harness Connections

W

W

BK

Neutral

LLV

KMS Icemaker Unit

(factory connected)

Wire Harness Connections

P BK

V

BR

GR

P

V

BR

HGV

CB

Fuse 10A

GND

GR

W

SRK Condensing Unit

(eld connected)

BK

P

V

BR

58

GR

W

BK

P

BR V

GND

LLV

HGV

Fuse 10A

Neutral

Contactor

Legend:

GND-ground

HGV-hot gas valve

Wire Color Code:

BK-black

BR-brown

CB-control board

GR-green

LLV-liquid line valve

L2-single phase power supply

P-pink

V-violet

L3-three phase power supply

W-white

WIRE COLOR CODE

BK -BLACK

BR -BROWN

DBU -DARK BLUE

GR -GREEN

GY -GRAY

O -ORANGE

P -PINK

R -RED

V -VIOLET

W -WHITE

Y -YELLOW

W/BR -WHITE/BROWN

W/R -WHITE/RED

W/BK -WHITE/BLACK

W/O -WHITE/ORANGE

W/BU -WHITE/BLUE

2A8704-012

208-230/60/3

2. KMS-1402MLJ with SRK-15J

CONTROL

BOARD

(O)

THERMISTOR

KMS-1402MLJ ON ON OFF OFF OFF

KMS-1402MLJ OFF OFF OFF ON ON ON ON OFF OFF OFF

S5 DIP SWITCH SETTING No.1 No.2 No.3 No.4 No.5

S4 DIP SWITCH SETTING No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10

X10 WV1 AND WV2 RELAY

X11 DRAIN VALVE/HARVEST PUMP TIMER RELAY

X12 DRAIN VALVE LOCKOUT RELAY 1

X13 DRAIN VALVE LOCKOUT RELAY 2

BR

BK

BR

BR

DISCHARGE

THERMOSTAT

BK

5

**

BR

HI-

PRESS.

*

BR

SRK (1 PHASE)

FUSE 10A

BR

K3

WHITE

2

3

1

(O)

BIN CONTROL

BK

BK

BK

C

COMP.

GY

35 MFD

CAP.

RUN

GY

R

2

START RELAY

1

R

O

R

START CAP.

189-227MFD

R

T3T1NO

T2

K4

RED

321

BK

BK

(BK)(BK)

FUSE 10A

BR

TERMINAL BLOCK

13579

BR

WIRING

HARNESS

BR

BK

R

BK

BK

BK

BK

BKGYV

BK

NC

K5

BLACK

321

(R)

(BK)

FLOAT SW.

P

BR

BR

P

P

531

P

P

P

BK

BK

7

BK

(R)

(BK)

(BK)

(BK)

V

BK

W

W

9

10

W

GR

9

10

W

LINE

(R)

HOT GAS

(R)

HOT GAS

(W)

FAN

(W)

FAN

BR

CRANKCASE

HEATER

V

V

BR

V

V

V

TERMINAL BLOCK

V

V

GY

C2

BK

W

VALVE

VALVE

VALVE

BR

P

P

P

P

W

(BK)

GND

(Y)

(Y)

(Y)

W

BR

W

BR

BR

P

GND

10

BR

BR

BR

W W

CAP.

10MFD

CAP.

10MFD

1

V

V

P

P

W/O

3

ICE

1

CONTROL

6

5

4

DBU

R

P

GY

Y

Y

Y

W/BU

1

3

V

R

R

OFF

SW.

W/R

CAP.

Y

R

(R)

10MFD

DBU

R
P

(WV1)

GY

P

P

P

W/BK

W

K2

321

R

V

HOT GAS

VALVE

8

P

6

O

4

GY

2

W/O

VALVE

LINE

(R)

BK

(R)

W/R

PUMP

D/BU

(D/BU)

8
6

4
2

FILL/

RE-FILL

WATER VALVE

HARVEST

WATER VALVE

(WV2)

X12X13

88
6

GY
Y

4

P

2

P

6

Y

4
2

Y

W/BU

DRAIN

VALVE

W/BU

V

WASH

VALVE

R

V

R

R

V

(BR)

(BK)

V

V

Y

BK

(BK)

W/BK

W

W/BK

W

W

W/BK

W

W/BK

W

W

W/BU

W/BU

W/BU

W/BU

W/BU

W

WW

Y

W

WWW

Y

Y

Y

W

W

Y

W

W

Y

W

W

Y

WW

W

Thermostat Switch

**

Cut-out 266°F±9°F (130°C± 5°C)

Cut-in 239°F±9°F (115°C±5°C)

BK

PSIG

0

22

* High-Pressure Switch

Cut-in 341±22 PSIG

Cut-out 426±

(Y)

7
5
3
1

X10

(Y)

X11

7
5
3
1

7
5
3
1

7
5
3
1

K1

2

3

4

5

6

7

8

9

V

O

BR

V

V

V

O

P

O

GY

V

W/O

W/O

BK

GY

BR

W/BR

W/O

GY

BR BR

GY

W/BR

W/O

GY

W/BR

W/O

W

GY

W

W

W/BR

W

W

W

W

W

W/BR

WWW

W

DBU

DBU

DBU

DBU

P

W/BR

P

BK

P

R

P

R

BK

R

BR

2

R

W/BR

R

SERVICE

ICE

R

OFF

R

BR

SERVICE

R

R

W/O

GY

CIRC

2

SERVICE

SWITCH WASH

O

BK

DRAIN

GND

L1 L2N

BR

W

BK

BR

MAGNETIC CONTACTOR

L3

L1

L2

COM

BK

BR

BR

W

BK

W/BK

BK

C1

W

W

W

59

WIRE COLOR CODE

DBU-DARK BLUE

W/BR -WHITE/BROWN

W/R -WHITE/RED

W/BK -WHITE/BLACK

W/O -WHITE/ORANGE

W/BU -WHITE/BLUE

2A8704-012

208-230/60/3

MAIN TRANSFORMER

3. KMS-1402MLJ with SRK-15J3

CONTROL

BOARD

(O)

THERMISTOR

KMS-1402MLJ ON ON OFF OFF OFF

KMS-1402MLJ OFF OFF OFF ON ON ON ON OFF OFF OFF

S5 DIP SWITCH SETTING No.1 No.2 No.3 No.4 No.5

S4 DIP SWITCH SETTING No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10

X10 WV1 AND WV2 RELAY

X11 DRAIN VALVE/HARVEST PUMP TIMER RELAY

X12 DRAIN VALVE LOCKOUT RELAY 1

X13 DRAIN VALVE LOCKOUT RELAY 2

BR

BR

DISCHARGE

THERMOSTAT

**

BR

HI-

PRESS.

BR

*

SRK (3 PHASE)

FUSE 10A

BR

K3

2

1

(O)

BR

WHITE

3

BK

(BK)(BK)

BIN CONTROL

C

BR

R

R

BR

T3T1NO

T2

K4

RED

321

321

BK

(BK)

FLOAT SW.

BR

V

V

BR

FUSE 10A

V

BR

TERMINAL BLOCK

13579

V

BR

WIRING

HARNESS

BR

V

TERMINAL BLOCK

R

V

COMP.

S

BK

BK

BK

V

BK

V

GY

BKGYV

BK

C2

NC

K5

(R)

BLACK

P

P

P

P

P

P

(BK)

(BK)

(BK)

BR

V

BK

W

BK

W

9

10

BK

GR

W

97531

10

W

BK

LINE

(R)

HOT GAS

(R)

HOT GAS

(R)

FAN

FAN

CRANKCASE

HEATER

BK

W

VALVE

VALVE

VALVE

(W)

BR

(W)

BR

123

V

V

P

P

W/O

3

ICE

1

CONTROL

6

5

4

DBU

R
P

GY

Y

Y

Y

W/BU

1

3

V

R

R

OFF

SW.

W/R

CAP.

Y

W

(R)

10MFD

K2

R

P
O

GY

W/O

R DBU
P

(WV1)

FILL/

(WV2)

HARVEST

GY

P

P

P

W/BK

V

321

V

HOT GAS

VALVE

X10

8
6

4
2

VALVE

LINE

(R)

BK

(R)

W/R

PUMP

D/BU

(D/BU)

8
6

4
2

X11

RE-FILL

WATER VALVE

WATER VALVE

X12

88

GY

6

Y

4

P

2

X13

P

6

Y

4

P

2

Y

W/BU

DRAIN

VALVE

W/BU

WASH

VALVE

R

V

R

V

W

(Y)

V

7
5

V

3

Y

1

(Y)

BK

(BK)

7

W

5
3

W/BU

1

W/BK

W

W/BU

W/BK

W

7

W

5
3
1

W/BU

W/BK

7

W

5
3

W/BU

1

W/BK

W/BU

W

W

(BK)

(BR)

W W

Y

W

W

BK

Thermostat Switch

**

W

Y

W

W

Y

Y

W W

W

Y

W

W

Y

W

W

Y

W

W

W

Cut-out 266°F±9°F (130°C± 5°C)

PSIG

0

22

* High-Pressure Switch

Cut-out 426±

Cut-in 239°F±9°F (115°C±5°C)

Cut-in 341±22 PSIG

K1

456

789

10

V

V

V

BR BR

W W

WWW

W

W

10MFD

W

10MFD

WW

W/O

W/O

W/O

W/O

W W

BR

V

P

BK

W/BR

W/BR

W/BR

W/BR

W/BR

W/O

BR

O

O

O

GY

GY

GY

GY

GY

GY

DBU

DBU

DBU

DBU

P

W/BR

BK

R

R

BK

R

BR

R

W/BR

R

R

OFF

R

BR

R

R

W/O

GY

CIRC

2

SERVICE

SWITCH

P

P

P

O

BK

2

SERVICE

ICE

SERVICE

DRAIN

WASH

BR

BR

P

BR

P

BR

P

P

GND

GND

(Y)

(Y)

(Y)

W

BR

CAP.

W

BR

CAP.

(BK)

GND

L1 L3L2

MAGNETIC CONTACTOR

L3

L1

L2

BR

BK BR R

COM

R

BK

W/BK

BR

W/BK

R

VOLTAGE

TAP SW.

BR

BK

W

C1

0V

BR

W

208V

BK

115V

BK

230V

BK -BLACK

BR -BROWN

60

GR -GREEN

GY -GRAY

O -ORANGE

P -PINK

R -RED

V -VIOLET

W -WHITE

Y -YELLOW