Hoshizaki KMH2100SRJ3, KMH2100SWJ3 User Manual

Service Manual

Stackable Crescent Cuber

Models
KMH-2100SWJ3, SRJ/3

hoshizakiamerica.com

Number: 73226
Issued: 7-5-2018

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

CONTENTS

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

I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7

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

1. Water-Cooled Models (SWJ3) .................................................................................. 7

2. Remote Models (SRJ/3) .......................................................................................... 8

B. Bin Control .................................................................................................................... 9

1a. Single Thermostatic Bin Control ............................................................................ 9

1b. Stacked Thermostatic Bin Control ......................................................................... 9

C. Water/Refrigeration Circuit Diagram ............................................................................ 10

1. Water-Cooled Models (SWJ3) ................................................................................ 10

2. Remote Models (SRJ/3) .........................................................................................11

II. Sequence of Operation and Service Diagnosis ............................................................... 12

A. Sequence of Operation Flow Chart ............................................................................. 12

1. Operation Flow Chart ............................................................................................ 12

2. Shutdown Flow Chart ............................................................................................ 13

3. Freeze-Time Correction Chart ............................................................................... 14

B. Service Diagnosis ....................................................................................................... 15

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

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

E. Bin Control Check ....................................................................................................... 25

1a. Single Thermostatic Bin Control Layout .............................................................. 26

1b. Stacked Thermostatic Bin Control Layout ............................................................ 26

F. Float Switch Check and Cleaning ................................................................................ 27

1. Float Switch Check ................................................................................................ 27

2. Float Switch Cleaning ............................................................................................ 28

G. Thermistor Check ........................................................................................................ 29

H. Control Switch ............................................................................................................. 29

I. Diagnostic Tables .......................................................................................................... 30

J. Freeze-Up Check List .................................................................................................. 34

3

III. Controls and Adjustments ............................................................................................... 35

A. Control Board Layout .................................................................................................. 36

B. LED Lights and Audible Alarm Safeties ....................................................................... 37

C. Settings and Adjustments ............................................................................................ 38

1. Default Dip Switch Settings .................................................................................... 38

2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 39

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ................. 39

4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 40

5. Harvest Pump Time Duration (Harvest Assist) (S4 dip switch 6) ........................... 40

6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7) ... 41

7. Factory Use (S4 dip switch 8)................................................................................. 41

8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 42

9. Float Switch Selector (S5 dip switch 1) ................................................................. 42

10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 42

IV. Refrigeration Circuit and Component Service Information.............................................. 44

A. Refrigeration Circuit Service Information .................................................................... 44

B. Component Service Information .................................................................................. 47

C. Water Regulating Valve Adjustment (water-cooled models) ........................................ 48

V. Maintenance .................................................................................................................... 49

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 50

VII. Disposal ......................................................................................................................... 52

VIII. Technical Information .................................................................................................... 53

A. Specication and Performance Data ........................................................................... 53

1. KMH-2100SWJ3 .................................................................................................... 53

2. KMH-2100SRJ ....................................................................................................... 54

3. KMH-2100SRJ3 .................................................................................................... 55

B. Wiring Diagrams .......................................................................................................... 56

1. Single Phase Models ............................................................................................. 56

2. Three Phase Models .............................................................................................. 57

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

The 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.

• The 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.

• 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.

• The icemaker 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 fuse, damage to existing
wiring, or component failure. This could lead to heat generation or re.

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

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

• Move the control switch to the "OFF" position and turn off the power supply before
servicing. 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, serious injury, re, or damage.

5

WARNING, continued

• The 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 the 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.

Additional Warning for Remote Models

• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and
ground connection to the remote condenser unit are supplied from the icemaker.
Failure to properly ground the remote condenser unit could result in death or
serious injury.

• Wire 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.

• Move the icemaker control switch to the "OFF" position and turn off the power
supply to the icemaker before servicing the remote condenser unit.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.

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

6

I. Construction and Water/Refrigeration Circuit Diagram

A. KMH Construction

1. Water-Cooled Models (SWJ3)

Spray Tubes

Evaporator Assembly

Cleaning Valve

Inlet Water Valve

Junction Boxes

Water Supply Inlet

Check Valve
(water)

Water Pump

Float Switch

Low-Side Service Valve

Thermostatic
Expansion Valves

Check Valves

High-Side Service Valve

Bin Control Thermostat

Hot Gas
Valve

Control Box

Control Switch

Main Transformer Box
(3 phase models)

Water Regulating
Valve

High-Pressure Switch

Condenser

Liquid Line
Valve

Strainer

Drier

Compressor

7

2. Remote Models (SRJ/3)

Evaporator Assembly

Compressor

Cleaning Valve

Spray Tubes

Inlet Water Valve

Junction Boxes

Water Supply Inlet

Check Valve
(water)

Water Pump

Float Switch

Low-Side Service Valve

Thermostatic
Expansion Valves

Check Valves

Discharge Service Valve

Bin Control Thermostat

Hot Gas
Valve

Control Switch

High-Side Service Valve

Control Box

Main Transformer Box
(3 phase models)

Liquid-Line
Service Valve

High-Pressure Switch

Strainer

Receiver

Drier

Liquid Line
Valve

Crankcase

Compressor

Heater

8

B. Bin Control

1a. Single Thermostatic Bin Control

Bin Control Bulb Holder F

Bin Control Bulb Holder E

Spacer

Bin Control Bulb Holder C

Bin Control
Extension Bracket

Z Bracket Used for Hoshizaki
B-1300, B-1500, B-1650, and
Non-Hoshizaki Ice Stoarage
Bin

1b. Stacked Thermostatic Bin Control

Bin Control Bulb Holder G

Silicone Hose

Bin Control Bulb Holder

Upper Bin Control Bulb Holder

Lower Bin Control Bulb Holder

Bin Control Bulb Holder E

Bin Control Bulb Holder C

Bin Control
Extension Bracket

Z Bracket Used for Hoshizaki
B-1300, B-1500, B-1650, and
Non-Hoshizaki Ice Stoarage
Bin

Bin Control Bulb Holder F

Bin Control Bulb Holder G

Spacer

Silicone Hose

Upper Bin Control Bulb Holder

Lower Bin Control Bulb Holder

9

C. Water/Refrigeration Circuit Diagram

1. Water-Cooled Models (SWJ3)

Check

Valves

Water Regulating Valve

Drain/Return

Condenser

Water Supply

Drier

Liquid Line

Val ve

Thermistor

Cleaning Valve

High-Pressure

Switch

Heat Exchanger

Hot Gas

Val ve

Suction Line

Service

Strainer

Service

Val ve

Val ve

Discharge Line

Compressor

Thermostatic Expansion Valves

Float Switch

Water Supply

Inlet Water Valve

Spray Tubes

Evaporator

Spray Tubes

Check Valve

Water

Tank

Drain

Water Pump

Pump-Out

Freeze/Harvest

Pump Timer

Refrigeration Circuit

Water Circuit

10

2. Remote Models (SRJ/3)

Service

Val ve

Fusible Plug

High Pressure

Hot Gas

Switch

Check

Valves

Val ve

Strainer

KM-2500SRH3: Headmaster

located in icemaker

Condenser

Water

Service

Val ve

Discharge Line

Suction Line

Receiver

Drier

Headmaster

(C.P.R.)

Service

Liquid Line

Val ve

Fan

Heat Exchanger

Val ve

Compressor

Expansion Valves

Thermistor

Cleaning Valve

Supply

Inlet Water Valve

Float Switch

Check Valve

Drain

Water Pump

Spray Tubes

Spray Tubes

Evaporator

11

Water

Tank

Pump-Out

Freeze/Harvest

Pump Timer

Refrigeration Circuit

Water Circuit

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

10th cycle

(S4 dip switch 5)

2 sec., then reverses

for 10/20 sec.

• Factory set for every

4. Pump-Out Cycle

• Pump motor stops for

(S4 dip switch 3 & 4)

FS in control

FS opens or freeze

timer terminates

Comp energized

FMR energized

HGV energized

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

Anti-Slush

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for

LLV de-energized

10 sec.

When freeze time differential exceeded,

freeze-time correction cycle starts.

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

Chart."

Time

FS closed

50 sec.

Comp energized

FMR energized

PM energized

LLV energized

HGV de-energized

FS check

FS open

3. Freeze Cycle

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer setting

(S4 dip switch 9 & 10).

5-min.

minimum

freeze timer

in control

Harvest Pump

Operation Flow Chart

PM energized

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

HPT setting (S4 dip switch 6), whichever is

shorter.

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

2. Harvest Cycle

• Max. harvest time: 20 min.

WV de-energized

FS closed

Comp energized

Thermistor temperature reaches

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts.

FMR energized

HGV energized

WV energized

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

The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position,

power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of the

evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the outside and the inside

of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart when the

control switch is placed in the "ICE" position.

WV energized

12

FS open

If FS is open, Comp stops and cycle

returns to 1-Min. ll.

Legend:

BC–bin control

CB–control board

Comp–compressor

FMR–fan motor-remote

FS–oat switch

HGV–hot gas valve

HPT–harvest pump time

LLV –liquid line valve

PM–pump motor

WV–inlet water valve

Fill Cycle

1. 1-Minute

Cycle

Steps

FS check

Startup

2. Shutdown Flow Chart

3. Ice Level Lowered

No ice touching BC bulb.

Icemaker starts at

"1. 1-Minute Fill Cycle."

To 1. 1-Minute Fill Cycle

BC closed

2. Icemaker Off

All components

de-energized.

BC open

All components

de-energized

NOTE: Green "BC CLOSED" LED

on continuously when K4

jumper is in place.

Shutdown Flow Chart

1. Bin Full

Within 10 sec. after ice contacts

BC bulb, icemaker shuts down.

Ice contacts BC bulb

BC

Shutdown

and Restart

Operation

Legend:

BC–bin control

13

3. Freeze-Time Correction Chart

2. 10-Minute Fill/Overow

WV energized

Comp de-energized

FMR de-energized

HGV 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.

repeat 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),

1. 10-Minute Harvest Cycle with WV
Comp energized

FMR energized

HGV energized

PM energized

WV energized

2A7664-02 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

FMR–fan motor-remote

HGV–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.

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

14

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.

B. Service Diagnosis

WARNING

• The 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. Control switch in "OFF" position does not de-energize all
loads Use extreme caution and exercise safe electrical practices.

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

• Before servicing the appliance, move the control switch to the "OFF" position and
turn off the power supply.

• 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/ice storage bin.

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

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

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

establish a good neutral connection.

• On models with a main transformer, the neutral (W) is provided through MT.
To conrm a good neutral, check for 60VAC from white (W) neutral to ground
(GND). If 60VAC is present, neutral 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.

Conrm that the location meets installation requirements:

• 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).

• The icemaker should not be located next to ovens, grills, or other high heat producing
equipment.

• Allow 6" (15 cm) clearance at rear, sides, and top for proper air circulation and ease of
maintenance and/or service should they be required.

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

15

1. Operation Diagnosis

1) Turn off the power supply, then access the control box. Move ice away from BC bulb.

2) Check that 115VAC 10A fuse is good.

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 green "BC CLOSED" LED turn
on. If CB yellow "BC OPEN" LED is on (indicating a full bin), check CB K4 red jumper
connection.

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."

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

Check for 115VAC at control switch #1 (BR) to neutral (W) then at control switch
#2(P) to neutral (W). If 115VAC is present on #1 (BR) and not on #2(P), replace
control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at
HPS (P) to neutral (W) then HPS (BK) to neutral (W). If115VAC is present at HPS
(P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If115VAC is
present at HPS (BK), check for 10.5VAC at CB K2#1 red wire to CB K2 #2 red wire.
If10.5VAC is not present, check that the cleaning valve interlock switch is closed.
Next, check CT continuity. If open, replace CT.

b) HPS Diagnosis: Conrm 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: HGV, strainer, or check valve.
Freeze Cycle: FMR, TXV, HM, LLV, strainer, check valve, drier, damaged line set or
tting, and fan blade for binding.

4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for
a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp,
HGV, FMR energized), continue to step 5a. If FS is open, WV 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 WV does not energize, check for 115VAC at WV. If 115VAC is present,
check coil continuity. Ifopen, replace WV. 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.

16

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,

FMR, HGV, X10, and X12 relays energize. 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). WV and X11 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.

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) or #9 (V) to neutral (W).
If115VAC is not present, check for 115VAC at CB K1 #7 (BR) or #10 (BR) to neutral
(W). If115VAC is present at #7 (BR) or #10 (BR) and not at #1 (V) or #9(V),
replaceCB. If 115VAC is present, check for 115VAC MC solenoid. 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) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If115VAC is not present and LED 2 is on, replace CB. If 115VAC is present, check for
115VAC at HGV coil and check HGV coil continuity. Replace as needed.

c) LLV Diagnosis: Conrm that LLV is de-energized and closed (not bypassing).

Ifenergized, replace CB. If de-energized and bypassing, replace LLV.

5b) Harvest Pump Time (Harvest Assist) – 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WV
de-energizes, LED 4 turns off, X11 relay de-energizes and LED 3turns on. PM
energizes. Comp, FMR, HGV, X10 and X12 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 WV continues, check for 115VAC
at CB K1 #6 (O). If115VAC is present, and LED 4 is off, replace CB. If LED 3is on and
PM is not energized, check for 115VAC at CB K1 #5(DBU). If115VAC is not present,
replace CB. If 115VAC is present and PM is not energized, check for 115VAC at X10relay
terminal #7 (Y) to neutral (W). If 115VAC is not present, check for 115VAC at X10 relay
terminal #3 (P) to neutral (W) and X10 relay terminal #5 (Y) to neutral (W). If 115VAC is
present on terminal #3(P) and not on terminal #5 (Y), replace X10 relay. If 115VAC is
present on X10 relay terminal #7 (Y) and PM is not energized, check for 115VAC at X10
relay terminal #4 (R) to neutral (W) and terminal #6 (DBU) to neutral (W). If 115VAC is
present on terminal #6(DBU) and not on terminal #4 (R), replace X10relay. If 115VAC
is present on X10relay terminal #4 (R), check control switch contact continuity between
terminals #4(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.

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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." 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.

6) Freeze Cycle – LED 1 is on. Comp, FMR, and PM continue. LLV energizes. HGV and
X10 and X12 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 harvest to K1 #4 (R) in freeze.
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, FMR, and PM continue. Conrm that

LLV energizes. Next, conrm HGV, X10 and X12 relays de-energize. During the
rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm WV de-energized
(not leaking by), HGV de-energized (not bypassing), LLV energizes, TXV and HM
operate correctly, Comp is efficient, and refrigerant charge is correct. See "VIII.A.
Specication and Performance Data."

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

check that appliance has not shut off on HPS ("POWER OK" LED off). If so, check
"3)b) HPS Diagnosis" above. If"POWER OK" LED is on, check for 115VAC at CB K1
#1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB.
Comp: If 115VAC is present, check for 115VAC at MC coil. If 115VAC is present,
check MC coil and contact continuity. Replace as needed. If MC is okay, 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."
FMR: If Comp is energized but FMR is not, check for 115VAC at the FMR junction
box. If 115VAC is not present, check icemaker wiring connections. If 115VAC is
present, check for voltage at condenser unit. If115VAC is not present, check eld
wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and
fan blade for binding.

c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to

neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB.
If115VAC is not present, replace WV (bypassing). If HGV did not close at the end of
harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present and
LED 3 is off, replace CB. If 115VAC is not present, replace HGV (bypassing).

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