Hoshizaki KMS-1402MLJ User manual

Model

KMS-1402MLJ

Including

Condensing Unit Models

SRK-15J/3

Modular Crescent Cuber

Service Manual

Number: 73224

Issued: 5-16-2018

hoshizakiamerica.com

2

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: 1-800-233-1940; (770) 487-2331

Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsuppor[email protected]

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.

3

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

4

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

5

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.

6

WARNING, continued

For KMS

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

loads.

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

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.

Failure to properly ground the appliance

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.

7

I. Construction and Water/Refrigeration Circuit Diagrams

A. Construction

1. Icemaker

Spray Tubes

Hot Gas Valve

Liquid Line Valve

Liquid Line

Shutoff Valve

Drier

Wash Valve

Suction Line

Shutoff Valve

Fill/Rell Water Valve (WV1)

Control Board

Pump Motor

Float Switch

Drain Water Valve

Control Switch

Service Switch

Harvest Water Valve (WV2)

Thermistor

Control Box

Bin Control

Extension Bracket

Switch Cover

Switch Bracket

Switch Mount

Bin Control

Fuse

Switch Box

Evaporator

8

2. Condensing Unit

Condenser

Headmaster (C.P.R.)

Hot Gas Valves

Liquid Line Valve

Receiver

Accumulator

Suction Line

Shutoff Valve

Thermostat (Discharge Pipe)

Compressor

Liquid Line Shutoff Valve 2

Fan Motors and Fan Blades

Check Valve

High Pressure Switch

SRK-15J Control Box

SRK-15J3 Control Box

Fuse

Crankcase Heater

Liquid Line

Shutoff Valve

Discharge Line Shutoff Valve

9

Spray Tube

KMS-1402MLJ

Harvest Water

Valve (WV 2)

Water Supply

Wash Valve

Liquid Line Valve Body

Drier

Liquid Line Valve

Liquid Line

Shutoff Valve

SRK-15J/3

Fan

Condenser

Headmaster

(C.P. R.)

Check Valve

Access Valve

Hot Gas Valves

Strainers

High-Pressure

Switch

Discharge Line

Thermostat

Discharge

Line

Compressor

Receiver

Accumulator

Suction Line

Hot Gas

Valve Body

Strainer

Check Valves

Expansion Valves

Float Switch

Drain Valve

Drain

Pump Motor

Water Tank

Fill/Rell Water

Valve (WV (WV 1)

Evaporator

Thermistor

Strainer

Discharge Line

Shutoff Valve

Liquid Line

Shutoff Valve

B. Water Circuit/Refrigeration Circuit Diagram

Service Valve

10

Components Energized when the Control Switch is in the "SERVICE" Position

When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode.

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

DRAIN

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

CIRC.

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.

WASH

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.

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

FS check

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Operation Flow Chart

1. 1-Minute

Fill Cycle

Cycle

Steps

2. Harvest Cycle

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

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

• Max. harvest time: 20 min.

Thermistor

in control

3. Freeze Cycle

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer setting

(S4 dip switch 9 & 10).

FS in control

4. Pump-Out Cycle

• Factory set for every 10th

cycle

(S4 dip switch 5)

WV1 energized

FS open

Comp energized

FMRs energized

HGVs energized

WV2 energized

WV1 de-energized

Thermistor temperature reaches

48°F (9°C) (3.9 kΩ or less). Harvest

timer starts.

FS open

Comp energized

FMRs energized

PM energized

LLVs energized

WV1 energized rst

1 min. of freeze

HGVs de-energized

FS closed

Comp energized

FMRs energized

HGVs energized

DV energized

PM stops for 2 sec., then

energized for 10/20 sec.

LLV de-energized

FS check

Startup

If FS is open, Comp stops and cycle

returns to 1-Min. ll.

5-min minimum

freeze timer in

control

FS closed

FS opens or freeze

timer terminates

50 sec.

PM energized

WV2 de-energized

Harvest Pump

Time

Anti-Slush

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for

10 sec.

When freeze time differential exceeded,

freeze-time correction cycle starts.

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

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

1 min.

Rell

11

Shutdown Flow Chart

1. Bin Full

Shutdown Delay:

• 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 end of the harvest cycle.

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

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

timer terminates. Otherwise, at the end of the next

harvest cycle.

Shutdown

and Restart

BC Operation

BC open (BC actuator paddle engaged)

Green "BC CLOSED" LED off

Yellow "BC OPEN" LED on

Yellow "BC OPEN" LED continues. All

components de-energized.

2. Icemaker Off

All components

de-energized.

3. Ice Level Lowered

Icemaker starts at

"1. 1-Minute Fill Cycle."

BC closed

(BC actuator paddle disengaged)

Green "BC CLOSED" LED on

Yellow "BC OPEN" LED off

To 1. 1-Minute Fill Cycle

Legend:

BC–bin control

Note: Control board retains freeze-time correction count

data between bin control restarts.

2. Shutdown Flow Chart

12

Legend:

Comp–compressor

FM–fan motor

FMRs–fan motor-remote

HGVs–hot gas valve

PM–pump motor

WV–inlet water valve

Freeze-Time Correction Flow Chart

1. 10-Minute Harvest Cycle with WV

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

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

step 1 for 5th and nal time.

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

Cycle.

2. 10-Minute Fill/

Overow

Comp energized

FMRs energized

HGVs energized

PM energized

WV energized

Comp de-energized

FMRs de-energized

HGVs de-energized

PM de-energized

Start

After 5th 10-Minute Harvest Pump Cycle with WV

Freeze-Time Correction Cycle Complete.

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

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:

Number of

Freeze Cycles

Differential

Value in Sec.

3 254

4 309

5 349

6 380

7 406

8 427

9 446

10 462

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.

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:

CB yellow "EXT HARVEST: LED turns off.

3. Freeze-Time Correction Chart

13

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.

14

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.

15

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).

16

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.

17

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.

18

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.

19

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.

20

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

Pump-Out Frequency Control Board

No. 5

OFF Every 10 cycles After 11th freeze cycle

ON Every cycle After 2nd freeze cycle

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.

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Hoshizaki KMS-1402MLJ User manual

Hoshizaki KMS-1402MLJ User manual

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