Hoshizaki KM660MRJ, KM520MRJ, KM520MAJ, KM350MWJ User Manual

Service Manual

Modular Crescent Cuber

Models
KM-350MAJ, MWJ
KM-520MAJ, MWJ, MRJ
KM-660MAJ, MWJ, MRJ

hoshizakiamerica.com

Number: 73230
Issued: 8-3-2018

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 service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage. Proper installation is the
responsibility of the installer. Product failure or property damage due to improper
installation is not covered under warranty.

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

Web Site: www.hoshizaki.com

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

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

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. Construction .................................................................................................................. 7

1. Air-Cooled Models (MAJ) ......................................................................................... 7

2. Water-Cooled Models (MWJ) ................................................................................... 8

3. Remote Models (MRJ) ............................................................................................. 9

B. Water/Refrigeration Circuit Diagram ............................................................................ 10

1. Air-Cooled Models (MAJ) ....................................................................................... 10

2. Water-Cooled Models (MWJ) ..................................................................................11

3. Remote Models (MRJ) ........................................................................................... 12

II. Sequence of Operation and Service Diagnosis ............................................................... 13

A. Sequence of Operation Flow Chart ............................................................................. 13

1. Operation Flow Chart ............................................................................................ 13

2. Shutdown Flow Chart ............................................................................................ 14

3. Freeze-Time Correction Chart ............................................................................... 15

B. Service Diagnosis ....................................................................................................... 16

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

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

E. Bin Control Check and Adjustment .............................................................................. 25

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

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

H. Control Switch ............................................................................................................. 30

I. Mode Switch ................................................................................................................. 30

J. Diagnostic Tables ......................................................................................................... 31

K. Freeze-Up Check List .................................................................................................. 35

III. Controls and Adjustments ............................................................................................... 36

A. Control Board Layout .................................................................................................. 37

B. LED Lights and Audible Alarm Safeties ....................................................................... 38

C. Settings and Adjustments ............................................................................................ 39

1. Default Dip Switch Settings .................................................................................... 39

2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 40

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ................. 40

4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 41

5. Harvest Pump Time (Harvest Assist) (S4 dip switch 6) ......................................... 41

6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7) .. 42

7. Factory Use (S4 dip switch 8)................................................................................. 42

8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 43

9. Pump-Out Pump Motor Direction (S5 dip switch 1) ............................................... 43

10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 44

11. Minimum Harvest Time (S5 dip switch 4) ............................................................. 44

12. Anti-Slush (S5 dip switch 5) ................................................................................. 44

3

IV. Refrigeration Circuit and Component Service Information.............................................. 45

A. Refrigeration Circuit Service Information .................................................................... 45

B. Component Service Information .................................................................................. 48

C. Water Regulating Valve Adjustment (water-cooled model) .......................................... 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. KM-350MAJ ........................................................................................................... 54

2. KM-350MWJ .......................................................................................................... 55

3. KM-520MAJ ........................................................................................................... 56

4. KM-520MWJ .......................................................................................................... 57

5. KM-520MRJ with URC-5F ..................................................................................... 58

6. KM-660MAJ ........................................................................................................... 59

7. KM-660MWJ .......................................................................................................... 60

8. KM-660MRJ with URC-5F ..................................................................................... 61

B. Wiring Diagrams ......................................................................................................... 62

1. KM-350M_J, KM-520M_J, KM-660M_J ................................................................. 62

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.

• 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 severe damage to equipment.

• 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 fuses, 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.

• 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.

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

• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, re, or damage to the unit.

• 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.

5

WARNING, continued

• 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.

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.

• 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 icemaker on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions in "VI. 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. Construction

1. Air-Cooled Models (MAJ)

Drain Valve

Cleaning Valve

Water Supply Inlet

Spray Tubes

Evaporator

Inlet Water Valve

Thermostatic
Expansion Valve

Float Switch

Compressor

Water Pump

Control Switch

Stainer

Hot Gas Valve

Condenser

High-Pressure
Switch

Fan Motor

Liquid Line
Valve

Drier

Bin
Control

Control Box

Mode Switch

Model Shown: KM-350MAJ

7

2. Water-Cooled Models (MWJ)

Cleaning Valve

Spray Tubes

Inlet Water Valve

Drain Valve

Water Supply Inlet

Stainer

Evaporator

Thermostatic
Expansion
Valve

Float Switch

Water Pump

Compressor

Control Switch

Mode Switch

Hot Gas Valve

Water Regulating
Valve

High-Pressure Switch

Condenser

Drier

Liquid Line Valve

Bin Control

Control Box

Model Shown: KM-520MWJ

8

3. Remote Models (MRJ)

Inlet Water Valve

Evaporator

Float Switch

Drain Valve

Spray Tubes

Cleaning Valve

Thermostatic
Expansion Valve

Water Supply Inlet

Stainer

Hot Gas Valve

Receiver Tank

High-Pressure
Switch

Drier

Water Pump

Crankcase Heater

Compressor

Liquid Line Valve

Bin Control

Control Switch

Control Box

Mode Switch

Model Shown: KM-660MRJ

9

B. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (MAJ)

Hot Gas

Val ve

Condenser

High-Pressure

Switch

Drier

Fan

Liquid Line Valve

Heat

Exchanger

Thermistor

Water Supply

Strainer

Suction Line

Discharge Line

Compressor

Thermostatic Expansion Valve

Spray Tubes

Inlet Water Valve

Water Pump

Drain

Refrigeration Circuit

Water Circuit

Evaporator

Cleaning Valve

Drain Valve

Float Switch

Water Tank

10

2. Water-Cooled Models (MWJ)

High-Pressure

Switch

Strainer

Hot Gas

Val ve

Discharge Line

Water Regulating Valve

Condenser

Inlet Water Valve

Drier

Thermostatic Expansion Valve

Suction Line

Heat

Exchanger

Liquid Line Valve

Thermistor

Water Supply

Cleaning Valve

Drain Valve

Float Switch

Compressor

Water Pump

Refrigeration Circuit

Water Circuit

Spray Tubes

Water Tank

Evaporator

Drain

11

3. Remote Models (MRJ)

High-Pressure

Switch

Strainer

Hot Gas

Val ve

Headmaster

(C.P.R.)

Fan

Remote Condenser

Receiver

Drier

Suction Line

Liquid Line

Val ve

Heat

Exchanger

Water Supply

Cleaning Valve

Inlet Water Valve

Thermistor

Drain Valve

Float Switch

Discharge Line

Compressor

Thermostatic Expansion

Val ve

Water Pump

Spray Tubes

Evaporator

12

Water Tank

Drain

Refrigeration Circuit

Water Circuit

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

cycle

(S4 dip switch 5)

2 sec., then reverses for

10/20 sec.

• Pump motor stops for

(S4 dip switch 3 & 4)

FS in control

Comp energized

DV energized

FMR energized

HGV energized

PM de-energizes for 2 sec.,

then energizes for 10/20 sec.

FM de-energized

LLV de-energized

FS opens or freeze

timer terminates

Anti-Slush

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for

10 sec.

Freeze Time Differential Exceeded.

• Factory set for every 10th

4. Pump-Out Cycle

Initiate Freeze-Time Correction Cycle.

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

• Min. freeze time: 5 min.

3. Freeze Cycle

switch 9 & 10)

Correction starts at 2nd freeze cycle.

• Max. freeze time: freeze timer setting (S4 dip

• Freeze-Time monitoring for Freeze-Time

5-min.

minimum

freeze timer in

Harvest Pump

control

Timer

FS closed

50 sec.

Comp energized

FM energized

FMR energized

PM energized

LLV energized

HGV de-energized

FS check

FS open

Operation Flow Chart

PM energized

WV de-energized

FS closed

Thermistor temperature reaches

Comp energized

FMR energized

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts.

HGV energized

WV energized

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

When the control switch is in the "PUMP" position power is supplied to the pump motor. Water tank contents then ows over the outside of the

evaporator plate assembly. Note: Water tank contents does not ow inbetween the evaporator plates.

(S4 dip switch 7), whichever is shorter. Do not adjust S4

dip switch 7 out of the factory position.

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

2. Harvest Cycle

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

• Max. harvest time: 20 min.

WV energized

FS open

If FS is open, Comp stops and cycle returns to

1-Min. ll.

then initiates a clean/sanitze program. See the maintenance label on the top cover or the instruction manual for details.

over outside of evaporator plate assembly as the control board power supply has been disconnected. The Clean/Sanitize program cannot initiate in this scenario.

• When the control switch is in the "ON" position and the mode switch is in the "CLEAN" position power is supplied to the control board K9 connector. The control board

Legend:

BC–bin control

Comp–compressor

DV–drain valve

FM–fan motor

FMR–fan motor-remote

FS–oat switch

HGV–hot gas valve

LLV –liquid line valve

Components Energized when the Control Switch is in the "ON" or "PUMP" position and the Mode Switch

PM–pump motor

WV–inlet water valve

• When the control switch is in the "PUMP" position and the mode switch is in the "CLEAN" position, only the pump motor energizes and circulates water tank contents

is in the "CLEAN" Position

Fill Cycle

FS check

1. 1-Minute

Cycle

Steps

Startup

13

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 sensor disengaged)

Green UBC LED on

Yellow "BC OPEN" LED off

Yellow "BC OPEN" LED continues. All

components de-energized.

Shutdown Flow Chart

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.

BC open (BC sensor engaged)

Green UBC 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

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

14

3. Freeze-Time Correction Chart

Overow

2. 10-Minute Fill/

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.

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

FMR energized

HGV energized

PM energized

2A8242-01 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

Cycle.

WV energized

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:

CB yellow "EXT HARVEST: LED turns off.

Freeze Time Differential Exceeded.

Minimum and Maximum Recorded Freeze

times have exceeded 600 sec. (10 min.)

Freeze-Time Correction function is enabled

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

and initiates when the difference between

the minimum and maximum recorded freeze

times is equal to or greater than 600 sec.

(10min.).

Freeze time is recorded and freeze cycles

are counted starting at the 2nd freeze cycle

after startup from a power off condition.

After 6recorded freeze cycles, CB starts

comparing the minimum and maximum

differential ofrecorded freeze cycle times.

Up to 10 freeze cycles are recorded and

maintained in memory. At the 11th recorded

freeze cycle, the rst recorded freeze

cycle time is dropped to maintain the

maximum number of 10 recorded 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.

15

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 switches and S5 dip
switches 1 through 5 are in the factory default position. S4 dip switch 1, 2, 3, 4, and 5 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.

• 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. Move the control switch to the
"OFF" position. Clear ice from BC sensing area.

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

16

1. Sequence and Component Diagnosis

3) Power On: Turn on the power supply, then move the control switch to the "ON"
position and the mode switch to the "ICE" position. A 5-sec. delay occurs. CB red
"POWER OK" LED turns on. If CB yellow "BC OPEN" LED is on (indicating a full
bin), move ice away from BC sensing area.

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" or BC using steps in "II.E.
Bin Control Check and Adjustment."

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

Check for 115VAC at control switch #2 (BK) to neutral (W) then at control switch #1(P)
to neutral (W). If 115VAC is present on #2 (BK) and not on #1(P), replace control
switch. If 115VAC is present on control switch #1 (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 is closed and the interlock switch is closed.
Next, check CT continuity. If open, replace CT.

b) HPS Diagnosis: Check that 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: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, WRV, HM, LLV, strainer, check valve, drier, and
damaged line set or tting.

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).

• 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.

4) 1-Min. Fill Cycle – LED 4 is on. WV energizes. 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.

17

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

HGV 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 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 #9 (Y) to neutral (W). If 115VAC is not
present, check for 115VAC at CB K1 #10 (BK) to neutral (W). If115VAC is present
at #10 (BK) and not at #9 (Y), replace CB. If 115VAC is present, check for 115VAC
at mode switch #2 (Y) to neutral and mode switch #1 (V) to neutral. If 115VAC is
present at #2 (Y) and not at #1 (V), conrm mode switch is in "ICE" position. If in
"ICE" position, check mode switch continuity. If open, replace mode switch. If 115VAC
is present at mode switch #1 (V), check for 115VAC at CR solenoid. If 115V AC is
present, conrm contacts are closed. If not, replace CR. If CR contacts are closed,
check Comp external overload, Comp start and run capacitors, Comp start relay, 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, check for 115VAC at CB K1 #1 (V). If 115VAC is not present,
check wiring for loose connection from CB 10 pin connector pin #1 (V) to mode
switch. If 115VAC is present on #1 (V) and not at #2 (Y), replace CB.
If 115VAC is present at #2 (Y), check for 115VAC at HGV coil and check HGV coil
continuity. Replace as needed. Note: LED is off when HGV is energized and on when
LLV/FM are energized.

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.

d) WRV Diagnosis: Conrm WRV is not leaking by. If WRV is leaking by, conrm HGV

is open and LLV is closed. Next, check for proper refrigerant pressures. If refrigerant
pressures are correct, adjust or replace WRV. See "IV.C. Water Regulating Valve
Adjustment (water-cooled models).".

5b) Harvest Pump Time (Harvest Assist) – LEDs 1 and 3 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 and LED 3 turns on. PM energizes. Comp,
FMR, and HGV 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 #4(R). If115VAC is not present, replace
CB. If 115VAC is present and PM is not energized, check PM capacitor and motor
winding continuity.

18

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, 2, and 3 are on. Comp, FMR, and PM continue. FM and
LLV energize. HGV de-energizes. 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 continues from CB K1 #4 (R) in harvest and 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) (5.8 kΩ) 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 FM

and LLV energize. Conrm WRV opens. Next, conrm HGV de-energizes.
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 and
FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient, and
refrigerant charge is correct. See "VIII.A. Specication and Performance Data
Sheets."

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

check that appliance has not shut off on HPS (CB "POWER OK" LED off). If so,
check "3)b) HPS Diagnosis" above. If CB "POWER OK" LED is on, check for 115VAC
at CB K1 #9 (Y) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB.
If 115VAC is present, check for 115VAC at CR coil. If 115VAC is present, check CR
coil and contact continuity. Replace as needed. If CR is okay, check Comp start relay
and start and run capacitors. Next, check 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." 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 de-energize
at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC
is present and LED 2 is on, replace CB. If 115VAC is not present, replace HGV
(bypassing).

19

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

de-energizes once freeze begins, 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 PM capacitor and motor winding continuity.

e) FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB

K1#3 (BK) to neutral (W). If 115VAC is not present and LED 2 is on, check for
115VAC at CB K1 #1(V). If 115VAC is present at #1 (V) and not at #3 (BK), replace
CB. If 115VAC is present and LED 2 is on:
For FM, check capacitor, motor winding, and blade for binding.
For LLV, check coil voltage and continuity.
Note: LED 2 is on for LLV/FM and off for HGV.

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) WRV Diagnosis: WRV is factory set and generally no adjustment is required.

IfWRV fails to open in freeze, check for proper refrigerant pressures. See "VIII.A.
Specication and Performance Data Sheets." If refrigerant pressures are correct and
WRV does not open, adjust or replace as needed. See "IV.C. Water Regulating Valve
Adjustment (water-cooled models)."

h) 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."

i) 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, WV screen.
Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by (water owing down the drain). If DV is leaking by, remove
and clean DV, replace if necessary. 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 5 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 FMR continue, HGV energizes.
Note: If S4dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV energizes.

NOTICE!S5 dip switch 1 must not be adjusted. This is the pump-out circulation
selection and allows DV to energize in pump-out.

FM and LLV de-energize. PM stops for 2 sec., then PM and DV energize 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 10 cycles or every cycle. For details,
see "III.C.4. Pump-Out Frequency Control (S4 dip switch 5)."

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 PM
stops and re-starts. Next, check that PM and DV energized (water owing down the
drain through DV). If PM does not stop and re-start, check that CB LEDs 1, 3, and
5are on. If not, replace CB. IfLEDs1,3, and 5 are on and PM does not energize,
check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB.
If not, check PM motor windings and impeller for binding. If energized, make sure DV
energized. If not, check for 115VAC at CB K1 #5 (W/BU). If 115VAC is not present and
LED 5 is on, replace CB. If 115VAC is present, check DV solenoid continuity. Replace as
needed. If DV is energized and open, check that the drain line is not clogged.

Conrm FM and LLV de-energize. If FM or LLV are energized with LEDs 1, 3, and 5 on,
replace CB.

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

1) See "II.E.1. Bin Control Check."

3. Freeze-Time Correction Cycle Diagnosis

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

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

DV–drain valve; FM–fan motor; FMR–fan motor remote; FS–oat switch; HGV–hot
gas valve; HM–headmaster (C.P.R.); HPS–high-pressure switch; L LV–liquid line
valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating
Valve; WV–inlet 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 difference between the minimum and maximum recorded
freeze times is equal to or greater than 600sec. (10min. ). Freeze time is recorded and
freeze cycles are counted starting at the 2nd freeze cycle after startup from a power
off condition. After 6 recorded freeze cycles, CB starts comparing the minimum and
maximum differential of recorded freeze cycle times. Up to 10freeze cycles are recorded
and maintained in memory. At the 11th recorded freeze cycle, the rst recorded freeze
cycle time is dropped to maintain the maximum number of 10 recorded freeze cycles.
Freeze time recordings and freeze cycle counts are retained in memory during a BC off
cycle and resume on the 2nd freeze cycle after BC restart.

1) Initiation and CB Operation: When the differential between minimum and maximum
recorded freeze times exceeds 600 sec. (10min.), freeze-time correction cycle starts.
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.

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 WV (10-min.) starts. Once
the nal Harvest Pump Time (Harvest Assist) with WV (10-min.) terminates
(90 min. complete), normal freeze cycle begins.

22

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

blinking. CB LEDs 1, 4, and 3 are on and Comp, FMR, HGV, PM, and WV energize.
10-min. timer starts. Once 10-min. timer terminates, CB LEDs 1, 3, and 2 turn off and
Comp, FMR, HGV, and PM de-energize. WV continues.

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

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

LED blinking. Once 10-min. timer terminates, CB LEDs 1, 4, and 3 are on and Comp,
FMR, HGV, and PM energizes. WV continues. 10-min. timer starts. Once 10-min. timer
terminates, normal freeze cycle begins. CB LED 1, 2, and 3 are on and Comp, FMR,
and PM continue. HGV and WV de-energize.

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; CR–compressor relay;

CT–control transformer; DV–drain valve; FM–fan motor; FMR–fan motor remote;
FS–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure
switch; L LV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve;
WRV–water regulating valve; WV–inlet 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, 7, 8, 9, 10 and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5,and 6 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 "ON" position and the mode switch to the "ICE" position.
If the red CB "POWER OK" LED is on, control voltage is good, continue to step 3. If CB
"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 (BK) 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.J.1. No Ice Production."

3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control
switch is in the "ON" position and the mode 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, 5, 3, 2.
Components (e.g., compressor) cycle during the test.

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

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

Legend: CB–control board; CT–control transformer

K3 Thermistor

Pin # VDC

#1 to #2 5VDC

#1 to #3 5VDC

#2 to #3 0VDC

K4 Jumper

Pin # VDC

#1 to #2 5VDC

#1 to #3 5VDC

#2 to #3 0VDC

K5 Float Switch

Pin # VDC

#1 to #2 1.2VDC

#1 to #3 2VDC

#2 to #3 1.2VDC

Thermistor

Jumper

Float Switch

CB

3

1

3

1

3

1

K3

RED WHITE

K4

BLACK

K5

24

E. Bin Control Check and Adjustment

WARNING

• All parts are factory-adjusted. Improper adjustments may adversely affect safety,
performance, component life, and warranty coverage.

• In Hoshizaki DB and DM dispenser applications, the bin control controller setting
must be adjusted to 2. For Coca-Cola Freestyle® Dispenser and other dispenser
applications, the bin control controller setting must be adjusted to 3. Increasing
the ice level on any dispenser application could lead to icemaker movement,
water leakage, or ice overow.

NOTICE

• Do not block the bin control lens with top kits or the icemaker will not operate
properly.

• Failure to properly adjust the bin control setting could result in water leakage, ice
backup, and icemaker damage.

1. Bin Control Check

The bin control is factory set for use on Hoshizaki America standard ice storage bins.
If mounted on a dispenser application or if a change to the ice level in an ice storage bin
application is desired, see "II.E.2. Bin Control Adjustment."

1) Remove the front panel and base cover. See Fig. 1.

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

3) Conrm the mode switch is in the "ICE" position, then move the control switch to the
"ON" position. See Fig. 2. Turn on the power supply, and allow the icemaker to operate.

Mode Switch

Fig. 2

Base Cover

Control Switch

Fig. 1

25

4) As water begins to ll the water tank (1-min. ll), place an object 5" to 7" (127 to
178mm) away from the bin control lens. See Fig. 3. 15 sec. later, the icemaker shuts
down. Remove the object from the bin control lens. 30 sec. later, the icemaker restarts.

Bin Control Lens

Fig. 3

Cycle at Bin
Control Activation

Fill Cycle 15 sec. after activation.

Harvest Cycle If engaged 15 sec. or longer, at the end of harvest cycle.

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

Ice Level in Bin Control Board

Empty OFF ON

Full ON OFF

Shutdown

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

Bin Control Controller

"OPEN/CLOSED" LED

LED 1

5) Once the icemaker restarts, move the control switch to the "OFF" position, then turn off
the power supply.

6) Replace the base cover in its correct position.

7) Move the control switch to the "ON" position. Replace the front panel in its correct
position, then turn on the power supply.

26

2. Bin Control Adjustment

WARNING

• All parts are factory-adjusted. Improper adjustments may adversely affect safety,
performance, component life, and warranty coverage.

• In Hoshizaki DB and DM dispenser applications, the bin control controller setting
must be adjusted to 2. For Coca-Cola Freestyle® Dispenser and non-Hoshizaki
dispenser applications, the bin control controller setting must be adjusted to 3.
Increasing the ice level on any dispenser application could lead to icemaker
movement, water leakage, or ice overow.

NOTICE

• Do not block the bin control lens with top kits or the icemaker will not operate
properly.

• Failure to properly adjust the bin control setting could result in water leakage, ice
backup, and icemaker damage.

The bin control is factory set to 1 for use on Hoshizaki America standard ice storage bins.
See the table below for adjustments to ice level.

WARNING! Do not adjust outside of these settings.

1) If not already removed, remove the front, top, and right side panels.

2) Conrm bin control controller setting for proper application. See the table below for
settings. See Fig. 4 for ice level reference.

Application Bin Control Ice Level Settings

Bin Control Controller

Setting
Default: Standard Ice Storage Bins 1 254 mm (10")
Hoshizaki DB and DM Dispensers 2 305 mm (12")

®

Coca-Cola Freestyle
Non-Hoshizki Dispensers

Optional Settings 4 508 mm (20")

Recommended Setting for
Hoshizaki DB or DM Dispenser

Factory Default for
Standard Ice Storage Bins

Dispenser and

Recommended Setting for
Coca-Cola Freestyle® Dispenser
and Non-Hoshizaki Dispensers

3 406 mm (16")

5 610 mm (24")

Ice Detection Distance From
Bin Control Lens

Bin Control

Lens

Setting #1

Setting #2
Setting #3
Setting #4
Setting #5

Bin Control
Controller

Model Shown:
KM-660MAJ-E with B-300SF

Fig. 4

27

F. Float Switch Check and Cleaning

FS is used to determine that there is sufficient water in the water tank after the 1-min.
ll cycle and after each harvest cycle. FS 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.

1. Float Switch Check

To check FS, 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) Drain the water tank. Remove the base

Disconnect This
End of Pump
Tubing to Drain
Water Tank

cover, then disconnect the water tank
end of the pump tubing to drain the water
tank. SeeFig. 5. After the water tank has

Base Cover

drained, reconnect the pump tubing.

4) Remove the top and right side panels.

Fig. 5

5) Disconnect the FS connector from CB K5connector.

6) Check for continuity across FS leads. With the water tank empty, FS should be open.
If open, continue to step 7. If closed, follow the steps in "II.F.2. Float Switch Cleaning."
After cleaning FS, check it again. Replace if necessary.

7) Reconnect FS connector to CB K5 connector, then replace the right side and top panels
and the base cover in their correct positions.

8) Move the control switch to the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply. After 1 min., the 1-min. ll cycle should end and
the initial harvest cycle should begin. If the initial harvest cycle begins, FS is good and
the check is complete. If the initial harvest cycle does not begin, continue to step 9.

9) Turn off the power supply.

10) Remove the front panel. Move the control switch to the "OFF" position.

11) Remove the top and right side panels.

12) Disconnect FS connector from CB K5 connector.

13) Check for continuity across FS leads. With the water tank full, FS should be closed.
IfFS is closed and the icemaker will not switch from the 1-min. ll cycle to the initial
harvest cycle, replace CB. If FS is open, conrm that the water tank is full. If the water
tank is not full, check the water supply, water lters, and inlet water valve. If the water
tank is full, follow the steps in "II.F.2. Float Switch Cleaning." After cleaning FS, check it
again. Replace if necessary.

14) Replace cube guide and base cover (if applicable) in their correct positions.

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

16) Move the control switch to the "ICE" position, then replace the front panel in its correct
position. Turn on the power supply to start the automatic icemaking process.

Legend: CB–control board; FS–oat switch

28

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on FS. Scale on the switch can
cause the oat to stick. In this case, FS should be cleaned.

1) Turn off the power supply.

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

3) Remove the base cover, disconnect the water tank end of the pump tubing to drain the
water tank. See Fig. 5. After the water tank has drained, reconnect the pump tubing.

4) Remove the cube guide, then pull the tab on the oat switch bracket to release the oat
switch assembly from the water tank.

5) Remove the spring retainer clip from the oat switch rod, then remove the oat.
Be careful not to bend the spring retainer clip excessively when removing it. See Fig. 6.

6) Wipe down the oat switch bracket assembly, stem, and oat with a mixture of 1 part
Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean
water. WARNING! Do not remove the lock nut on the oat switch assembly. This is

factory sealed and must not be removed.

7) Reassemble the oat switch assembly and replace it in its correct position.

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

9) Replace the base cover, cube guide, and front panel in their correct positions.

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

Legend: CB–control board; FS–oat switch

Float Switch
Bracket Assembly

Water
Sealed
Connections

Float Switch
Stem

Float

Spring Retainer
Clip

Float Switch
Bracket Assembly

Water
Sealed
Connections

Float Switch
Stem

Float

Spring Retainer
Clip

Float Switch Tab

Fig. 6

29

Float Switch Tab

G. Thermistor Check

To check thermistor resistance, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel. Move the control switch to the "OFF" position, then remove the
top and right side panels.

3) Remove the thermistor from the refrigerant tubing.

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

5) Disconnect the thermistor connector from CB K3 connector and check the 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 the next step.

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

7) Reconnect the thermistor connector to CB K3 connector.

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

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

10) Replace the front panel in its correct position.

11) Turn on the power supply.

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

13) The harvest timer and harvest cycle should terminate within 2 to 5 min. If the harvest
cycle does not terminate within 2 to 5 min., replace CB.

Legend: CB–control board; Comp–compressor

H. Control Switch

The control switch has two positions: "ON for power on, "PUMP" to energize the pump
motor and circulate the water in the water tank.

I. Mode Switch

The mode switch has two positions: "ICE" for icemaking cycle, "CLEAN" for initiating the
cleaning and sanitizing program.

30

J. Diagnostic Tables

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. Fuse (Control Box) a) Blown.

3. Control Switch a) In "OFF" or "PUMP" position.

b) Defective.

4. High-Pressure Switch a) Dirty condenser.

b) Fan motor not operating.

c) Refrigerant overcharged.

d) Bad contacts.

e) Refrigerant lines or components plugged.

5. Control Transformer
(115VAC/10.5VAC)

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

7. Bin Control
See "II.E.1. Bin Control Check"

8. Mode Switch a) In "CLEAN" position.

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

10. Inlet Water Valve a) Screen or orice clogged.

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

12. Compressor a) Compressor relay/magnetic contactor contacts bad or coil winding

13. Hot Gas Valve a) Closed in harvest cycle.

14. Thermistor
See "II.G. Thermistor Check"

15. Pump Motor a) Motor winding open.

a) Coil winding open or shorted.

a) In alarm.

b) CB yellow "BC OPEN" LED on (bin full).

c) Defective.

a) Tripped with bin lled with ice.

b) Sensor lens dirty.

c) Defective.

b) Defective.

b) External water lters clogged.

b) Coil winding open.

c) Water valve open in freeze cycle.

a) Float does not move freely.

b) Defective.

open.

b) Start capacitor or run capacitor defective (single phase).

c) Internal protector open.

d) Start relay contacts bad or coil winding open (single phase).

e) Compressor defective.

b) Open in freeze cycle.

a) Loose, disconnected, or defective.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

d) Mechanical seal worn out.

31

No Ice Production - Possible Cause

16. Thermostatic Expansion Valve a) Bulb loose.

b) Operating erratically.

1 7. Liquid Line Valve a) Closed in freeze cycle.

b) Open in harvest cycle.

18. Fan Motor a) Motor winding open.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

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

2. Freeze-Up

Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See "II.K. 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 and/or Spray
Guides

4. Water Supply a) Low water pressure.

5. Inlet Water Valve a) Screen or orice clogged.

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

7. Refrigerant Charge a) Low.

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

9. Bin Control
See "II.E.1. Bin Control Check"

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

11. Thermostatic Expansion Valve a) Defective.

12. Hot Gas Valve a) Defective.

13. Liquid Line Valve a) Defective.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) copper
water tubing or equivalent.

b) Defective.

a) Dirty, sticking.

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) Defective.

a) Loose, disconnected, or defective.

32

Freeze-Up - Possible Cause

Freeze Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Spray Tubes and/or Spray
Guides

3. Refrigerant Charge a) Low.

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

5. Inlet Water Valve a) Leaking by.

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

7. Pump Motor a) RPM too slow.

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

9. Liquid Line Valve a) Restricted.

10. Headmaster (C.P.R.)
(remote models)

a) Dirty.

b) Out of position.

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

b) Defective.

a) Float does not move freely.

b) Defective.

b) Impeller damaged.

a) Not bypassing.

3. Low Ice Production

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up.

2. Spray Tubes and/or Spray
Guides

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 Valve a) Erratic or closed.

8. Inlet Water Valve a) Screen or orice clogged.

9. Compressor a) Inefficient or off.

10. Liquid Line Valve a) Erratic or open.

11. Thermostatic Expansion Valve a) Defective.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) water
tubing or equivalent.

d) Too cold.

a) Thermistor connection loose (K3).

b) Defective.

a) Loose, disconnected, or defective.

33

Low Ice Production - Possible Cause

Long Freeze Cycle

1. Evaporator a) Scaled up, dirty.

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

3. Inlet Water Valve a) Leaking by.

4. Hot Gas Valve 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 a) Bulb loose.

9. Compressor a) Inefficient or off.

10. Pump Motor a) RPM too slow.

11. Liquid Line Valve a) Erratic or restricted.

12. Headmaster (C.P.R.)
(remote models)

13. Splash Guard a) Out of place.

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

a) Float switch connection loose (K5).

b) Defective.

b) Defective.

a) Not bypassing.

b) Missing or damaged.

Freeze-Time Correction Cycle Initiated

1. Evaporator a) Scaled up, dirty.

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

3. Refrigerant Charge a) Low.

4. Splash Guard a) Out of place.

5. Distribution/Spray Tubes a) Scaled up, dirty.

6. Cube Guides a) Out of position.

7. See "2. Freeze Up" Above

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

b) Missing or damaged.

b) Damaged.

34

K. 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 stand alone?
[ ] [ ] 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?
[ ] [ ] 17) Are splash guards in place?

Appliance Sequence of Operation

Fill
YES NO
[ ] [ ] 18) 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.

[ ] [ ] 19) If NO in step 17, is water ow 5GPM for larger?

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?

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.

35

III. Controls and Adjustments

• A Hoshizaki exclusive control board is employed in KM series appliances.

• All models are pretested and factory adjusted.

• For a control board check procedure, see "II.C. 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 K3 WHITE, K4RED,
and K5 BLACK, because the same connector is used for the thermistor, bin
control, and oat switch.

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

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

36

A. Control Board Layout

1. "K" Control Board

"K" Control Board

• "ALARM RESET"
Button

• Bin Control Switch
Open LED (yellow)

• K9 (white)

(Cleaning and
Sanitizing Circuit)

• Ext. Harvest
LED (yellow)

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

• Alarm Buzzer

• 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 #3

• LED 3 (X3 Relay)

LED 3 on:
K1 Connector Pin #4

• LED 5 (X5 Relay)

LED 5 on:
K1 Connector Pin #5

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

• LED 1 (X1 Relay)

K1 Connector Pin #9

• S4 Dip Switch

• K2 Connector

Control Transformer
(10.5VAC)

• "OUTPUT TEST" Button

(used to test relays on control board)

• K3 (white) Connector

Thermistor
(harvest control and
high temperature safety)

• K4 (red) Connector

Bin Control

• S5 Dip Switch

• K5 (black) Connector

Float Switch

• Part Number

• K1 Connector

Pins #1 through #10
#1 Hot Gas Valve (#2) and
Fan Motor/Liquid Line
Valve (#3) Power Supply
#2 Hot Gas Valve
#3 Fan Motor
Liquid Line Valve
#4 Pump Motor
#5 Drain Valve
#6 Inlet Water Valve
#7, 8 Open
#9 Compressor Relay,
Pin #1 Power Supply
(Hot Gas Valve (#2) and
Fan Motor/Liquid Line
Valve (#3))
#10 Component Power Supply

"K" Control Board

Part Number 2A8242-01

37

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 5 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, 5, 3, 2.

Sequence Step LED

1-Minute Fill Cycle 4 WV
Harvest Cycle 1, 4 Comp, FMR, HGV, WV 1 minute 20 minutes
Harvest Pump Time

(harvest assist)
Freeze Cycle 1, 2, 3 Comp, FM/FMR, PM, LLV 5 minutes freeze timer

Anti-Slush Control 1, 2 Comp, FM/FMR, LLV PM off 10 sec. when

Pump-Out Cycle 1, 4
*pump-out timer setting

1, 3 Comp, FMR, HGV, PM 0 seconds 50 seconds

*

, 5, 3 Comp, FMR, HGV, PM, WV*, DV 10 seconds 20 seconds

Energized

Components

Time LEDs are On

Min. Max.

setting

thermistor at 36°F (2°C)

Alarms

Type Alarm Notes

1

Beep

2

Beep

3

Beep

LED Blink Freeze-Time

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)

Correction
(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.

CB red "POWER OK" LED blinks.
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; DV–drain valve; 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; WV–inlet water valve

38

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 your
Hoshizaki Service Center.

1. Default Dip Switch Settings

The dip switches are factory-adjusted to the following positions:

S4 Dip Switch No. 1 2 3 4 5 6 7 8 9 10

KM-350MAJ, KM-350MWJ OFF OFF OFF ON ON OFF ON OFF ON ON

KM-520MAJ, KM-520MWJ, KM-520MRJ OFF OFF OFF OFF OFF OFF ON OFF ON ON

KM-660MAJ, KM-660MWJ, KM-660MRJ OFF OFF OFF OFF OFF OFF ON OFF ON ON

S5 Dip Switch (Do Not Adjust)

Dip Switch No.

All Models OFF OFF OFF OFF ON

1 2 3 4 5

ON

S4 Dip Switch

Freeze Timer (9 & 10)

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

Harvest Pump Time (Harvest Assist) (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)

39

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)

When a pump-out is called for, the pump motor stops for 2 sec. After 2 sec. the drain
valve and pump motor energize. On KM-350M_J models the inlet water valve also
energizes. 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.
During pump-out cycles minimum harvest time is based on times given in the
table below.

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

Inlet Water

Valve

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

40

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) (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) is only active when S4 dip switch 7 is in the "ON"
position. In the factory default position, the harvest pump time (harvest assist) 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) 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)

41

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) Harvest Pump Time (Harvest Assist)

Depending on S4 dip switch 7 setting, the pump motor either stays off or is energized
during the last seconds of the harvest cycle. When the pump motor is energized (S4 dip
switch 7 on), water circulates over the evaporator. The harvest water valve is open during
harvest for a maximum of 6 minutes or the length of harvest minus the harvest pump
time value(S4 dip switch 6), whichever is shorter.

When S4 dip switch 7 is in the on position and harvest begins, 50 sec. before harvest
termination, LED 4 turns off, inlet water valve Next, LED 3 turns on and control board
K1connector pin #4 (R) energizes, energizing the pump motor for the last seconds of
harvest. Harvest pump time adjusted by S4 dip switch 1 & 2 and S5 dip switch 4settings.
Contact Technical Support before adjusted these settings.

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.

42

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.J.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. Pump-Out Pump Motor Direction (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.

The pump-out pump motor direction setting determines pump motor rotation during
pump-out.
On models with a drain valve pump motor rotation doesn't change at pump-out.
Pump motor rotates in forward direction and drain valve is energized for pump-out.
On models with a check valve, pump motor rotation reverses at pump-out.
Pump motor rotates in reverse direction and opens check valve for pump-out.

S5 Dip Switch Setting

Pump-Out ComponentsNo. 1

OFF Pump Motor Forward Rotation and Drain Valve

ON Pump Motor Reverse Rotation and Check Valve

43

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.

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)

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 5.8 kΩ signal
from the thermistor and de-energizes the water pump for 10 sec. to melt the ice slush
and prevent the ice slush from blocking the water supply tubing, causing irregular freeze
patterns.

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

Anti-SlushNo. 5

OFF Disabled

ON Enabled

44

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 icemaker is provided with refrigerant access valves. Using proper refrigerant practices,
recover the refrigerant. Store the refrigerant in an approved container. Do not discharge the
refrigerant into the atmosphere.

45

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)

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.

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

46

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.

47

B. Component Service Information

NOTICE

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

Component Notes

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

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.

48

C. Water Regulating Valve Adjustment (water-cooled model)

The water regulating valve is factory set, and generally no adjustment is required. However,
when necessary, adjust the water regulator using the following procedure.

1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure
gauge to the high-side line of the system.

2) 5 min. after a freeze cycle starts, conrm
that the thermometer reads 104°F to 115°F
(40°C to 46°C). If it does not, rotate the
adjustment screw by using a at blade
screwdriver until the temperature is in the
proper range. See Fig. 7. Next, check that
the reference pressure is in the range
indicated in the Head Pressure table in the
Performance Data section. If it is not in the

Top View

proper range, verify the refrigerant charge.

3) Check that the condenser drain temperature is stable.

Adjustment Screw

CW – Higher
CCW – Lower

Fig. 7

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 "WASH" 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. Remove the water from the icemaker water line:

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

2) Close the icemaker water supply line shut-off valve and open the icemaker water supply
line drain valve.

3) Allow the line to drain by gravity.

4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line
drain valve.

5) Make sure at least 3 min. have elapsed since you turned off the power supply. Make
sure the control switch is in the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply.

6) Blow the icemaker water supply line out using the compressed air or carbon dioxide
supply.

7) Close the icemaker water supply line drain valve.

2. Remove the water from the water tank:

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

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

3) Drain the water tank. remove the base
cover, then disconnect one end of the

Disconnect This
End of Pump
Tubing to Drain
Water Tank

pump tubing to drain the water tank.
SeeFig. 8. After the water tank has drained,
reconnect the pump tubing.

4) Replace the base cover (if applicable) and
front panel in their correct positions.

Base Cover

Fig. 8

5) Remove all ice from the dispensing unit/ice storage bin. Clean the storage bin liner
using a neutral cleaner. Rinse thoroughly after cleaning.

51

3. On water-cooled model, remove the water from the water-cooled condenser:

1) Make sure the power supply is off, then remove the front panel and right side panel.

2) Close the condenser water supply line shut-off valve. If connected to a closed loop
system, also close the condenser return line shut-off valve.

3) Open the condenser water supply line drain valve. If connected to a closed loop system,
also open the condenser return line drain valve.

4) Attach a compressed air or carbon dioxide supply to the condenser water supply line
drain valve.

5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer
underneath the spring. While holding the valve open, blow out the condenser using the
compressed air or carbon dioxide supply until water stops coming out.

6) Close the drain valve(s).

7) Replace the right side panel and front panel in their correct positions.

52

VII. Disposal

The 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. KM-350MAJ

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 9.05 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 890 (5.42) 810 (3.99)
WATER gal./24HR (gal./100 lbs.) 57 (14.5) 136 (27.8)
ICE PRODUCTION PER CYCLE 10.5 lbs. (4.8 kg) 480 pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 1 lb. 3.4 oz. (550g)

Performance Data 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)

70/21 489 222
80/27 468 212 424 192 407 185
90/32 461 209 393 178 372 169

100/38 461 209 388 176 353 160

70/21
80/27
90/32

70/21 136 0.52
80/27 119 0.45 82 0.31 85 0.32
90/32 113 0.43 57 0.22 54 0.20

100/38 87 0.33 56 0.21 51 0.19

70/21
80/27
90/32

70/21
80/27
90/32

70/21 233 16.4

80/27 245 17.2 270 19.0 304 21.4
90/32 249 17.5 287 20.2 320 22.5

100/38 257 18.1 295 20.7 350 24.6

70/21 58 4.1 59 4.1 60 4.2
80/27 58 4.1 59 4.2 60 4.2
90/32 59 4.1 60 4.2 61 4.3

100/38 59 4.1 60 4.2 62 4.4

50/10 70/21 90/32

810

828
833
852

29

31
31
31

3.1

2.9

2.8

2.4

WATER TEMP. (ºF/ºC)

461 209 437 198

833
864

890

905

113 0.43 103 0.39

31
34

37

37

2.8

2.3

2.0

2.0

249 17.5 278 19.6

888
931
953

1010

33
36
38
40

2.7

2.4

2.0

2.0

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

5,700 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

54

2. KM-350MWJ

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 780 (4.90) 770 (4.47)
WATER gal./24HR (gal./100 lbs.) 59 (15.5) 96 (23.2)
WATER COOLED CONDENSER 415 (109) 139 (34)
gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE 10.5 lbs. (4.8 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 0 lb. 11.6 oz. (330g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 414 188 405 184 390 177
80/27 407 185 393 178 376 171
90/32 405 184 383 174 366 166

100/38 401 182 379 172 351 159

70/21
80/27
90/32

70/21 236 0.89 306 1.16 416 1.57
80/27 289 1.09 398 1.51 516 1.95
90/32 306 1.16 475 1.80 592 2.24

100/38 417 1.58 502 1.90 699 2.65

70/21
80/27
90/32

70/21
80/27
90/32

70/21 228 16.0 228 16.0 233 16.4
80/27 228 16.0 228 16.0 235 16.5
90/32 228 16.0 228 16.0 234 16.5

100/38 231 16.2 229 16.1 240 16.9

70/21 59 4.1 59 4.2 59 4.2
80/27 59 4.2 60 4.2 60 4.2
90/32 59 4.2 60 4.2 60 4.2

100/38 59 4.2 60 4.2 60 4.2

50/10 70/21 90/32

770 773 774
772 777 776
773 780 780
772

34 35 36
35 36 37
35 37 38
35 37

2.8 2.6 2.5

2.7 2.4 2.3

2.6 2.2 2.1

2.4

WATER TEMP. (ºF/ºC)

780 780

38

2.1 2.0

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
WATER FLOW FOR CONDENSER 27 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]

6,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

55

3. KM-520MAJ

lbs./day

kg./day

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 10.6 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 940 (4.68) 840 (3.64)
WATER gal./24HR (gal./100 lbs.) 71 (14.7) 180 (32.4)
ICE PRODUCTION PER CYCLE 10.3 lbs. (4.7 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 1 lb. 10.8 oz. (760g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

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)

70/21 556 252
80/27 539 245 505 229 465 211
90/32 534 242 480 218 441 200

100/38 524 238 471 214 405 184

70/21
80/27
90/32

70/21 180 0.68
80/27 156 0.59 106 0.40 107 0.41
90/32 148 0.56 71 0.27 65 0.25

100/38 112 0.42 69 0.26 59 0.23

70/21
80/27
90/32

70/21
80/27
90/32

70/21 200 14.1
80/27 214 15.1 243 17.1 275 19.3
90/32 218 15.4 263 18.5 295 20.7

100/38 226 15.9 270 19.0 324 22.8

70/21 46 3.2 49 3.4 52 3.6
80/27 48 3.4 52 3.7 55 3.9
90/32 49 3.4 55 3.9 58 4.1

100/38 49 3.5 56 3.9 61 4.3

50/10 70/21

840 869 891
862 908 919
869 940 956
867

24 25 28
25 27 31
25 29 32
26 30 35

3.4 3.0 2.9

3.1 2.4 2.6

3.0 2.0

2.6

WATER TEMP. (ºF/ºC)

90/32

534 242 497 226

944 970

148 0.56 133 0.50

2.0

2.0 2.0

218 15.4 248 17.4

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

6,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

56

4. KM-520MWJ

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 8.45 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 860 (4.65) 880 (4.45)
WATER gal./24HR (gal./100 lbs.) 66 (14.8) 114 (24.1)
WATER COOLED CONDENSER 333 (75) 149 (31)
gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE 10.7 lbs. (4.8 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 0 lb. 12.7 oz. (360g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 474 215 465 211 451 204
80/27 467 212 454 206 438 199
90/32 465 211 444 201 428 194

100/38 462 209 440 200 414 188

70/21
80/27
90/32

70/21 263 1.00
80/27 294 1.11 355 1.34 438 1.66
90/32 303 1.15 399 1.51 479 1.81

100/38 371 1.40 418 1.58 552 2.09

70/21
80/27
90/32

70/21
80/27
90/32

70/21 284 20.0 284 19.9 282 19.8
80/27 284 20.0 283 19.9 280 19.7
90/32 284 19.9 283 19.9 280 19.7

100/38 283 19.9 282 19.9 278 19.5

70/21 54 3.8 54 3.8 55 3.9
80/27 54 3.8 55 3.8 56 3.9
90/32 54 3.8 55 3.9 56 3.9

100/38 55 3.8 55 3.9 57 4.0

50/10 70/21 90/32

880 874 864
876 866 856
874 860 850
872

30 30 31
30 31 32
30 32 33
30 32

3.1 2.8 2.7

2.9 2.4 2.5

2.8 2.0 2.0

2.5

WATER TEMP. (ºF/ºC)

858 840

303 1.15 376 1.42

33

2.0 2.0

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 2,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
WATER FLOW FOR CONDENSER 20 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]

14,700 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

57

5. KM-520MRJ with URC-5F

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 12.05 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 990 (4.80) 920 (4.05)
WATER gal./24HR (gal./100 lbs.) 67 (13.6) 173 (31.6)
ICE PRODUCTION PER CYCLE 10.6 lbs. (4.8 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE TOTAL R404A, 4 lb. 2.7 oz. (1890g)

ICEMAKER, 2 lb. 4.7 oz. (1040g)
CONDENSER, 1 lb. 14 oz. (850g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 547 248 532 241 507 230
80/27 535 243 512 232 484 220
90/32 532 241 495 225 468 212

100/38 525 238 489 222 444 201

70/21
80/27
90/32

70/21 173 0.65 142 0.54 129 0.49
80/27 149 0.57 101 0.38 105 0.40
90/32 142 0.54 67 0.25 64 0.24

100/38 108 0.41 66 0.25 60 0.23

70/21
80/27
90/32

70/21
80/27
90/32

70/21 207 14.6 223 15.6 249 17.5
80/27 219 15.4 243 17.1 272 19.1
90/32 223 15.6 260 18.3 289 20.3

100/38 230 16.1 267 18.8 315 22.1

70/21 50 3.5 50 3.5 53 3.7
80/27 50 3.5 51 3.6 55 3.9
90/32 50 3.5 51 3.6 55 3.8

100/38 52 3.6 52 3.6 58 4.1

50/10 70/21 90/32

920 941 963
936 968 986
941 990 1011
943 995 1030

25 26 28
26 28 30
26 29 32
26 30

3.4 3.0

3.1 2.5 2.6

3.0 2.0 2.0

2.6 2.0 2.0

WATER TEMP. (ºF/ºC)

34

2.9

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME 43 CU. IN. URC-5F

6,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

58

6. KM-660MAJ

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 15.2 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1320 (5.12) 1200 (4.34)
WATER gal./24HR (gal./100 lbs.) 91 (14.8) 204 (30.6)
ICE PRODUCTION PER CYCLE 10.7 lbs. (4.8 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 1 lb. 9.8 oz. (730g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 665 301
80/27 654 297 632 287 607 275
90/32 650 295 617 280 591 268

100/38 645 292 611 277 569 258

70/21
80/27
90/32

70/21 204 0.77
80/27 178 0.68 127 0.48 131 0.50
90/32 171 0.65 91 0.35 87 0.33

100/38 134 0.51 90 0.34 84 0.32

70/21
80/27
90/32

70/21
80/27
90/32

70/21 212 14.9
80/27 227 16.0 257 18.1 292 20.6
90/32 232 16.3 279 19.6 313 22.0

100/38 240 16.9 287 20.2 345 24.3

70/21 37 2.6 39 2.8 46 3.2
80/27 39 2.7 42 3.0 51 3.6
90/32 39 2.8 45 3.2 53 3.7

100/38 42 2.9 47 3.3 60 4.2

50/10 70/21 90/32

1200 1235 1278
1227 1281 1321
1235 1320 1362
1242 1330 1400

20 21 23
21 22 24
21 24 25
21 24 27

3.4 3.0 2.8

3.1 2.4

3.0 2.0 2.0

2.5 2.0 2.0

WATER TEMP. (ºF/ºC)

650 295 627 285

171 0.65 157 0.59

2.5

232 16.3 264 18.5

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

8,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

59

7. KM-660MWJ

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 12.35 A ( 5 Min. Freeze AT 104°F / W T 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1190 (4.28) 1130 (4.07)
WATER gal./24HR (gal./100 lbs.) 107 (16.1) 194 (29.1)
WATER COOLED CONDENSER 1017 (152) 483 (72)
gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE 10.8 lbs. (4.9 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE R404A, 0 lb. 15.2 oz. (430g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 669 303 669 303 644 292
80/27 669 303 668 303 630 286
90/32 669 303 668 303 635 288

100/38 655 297 661 300 605 274

70/21
80/27
90/32

70/21 677 2.56 808 3.06 998 3.78
80/27 777 2.94 981 3.71 1176 4.45
90/32 808 3.06 1125 4.26 1322 5.00

100/38 1010 3.82 1171 4.43 1503 5.69

70/21
80/27
90/32

70/21
80/27
90/32

70/21 228 16.0 229 16.1 231 16.2
80/27 228 16.1 229 16.1 232 16.3
90/32 229 16.1 230 16.2 233 16.4

100/38 229 16.1 231 16.2 235 16.5

70/21 40 2.8 41 2.9 44 3.1
80/27 41 2.9 43 3.1 46 3.2
90/32 41 2.9 45 3.2 48 3.3

100/38 42 3.0 46 3.2 50 3.5

50/10 70/21 90/32

1130 1148 1130
1143 1171 1130
1148 1190 1159
1130 1183 1130

19 19 19
19 20 19
19 20 19
19 20

3.1 2.8

2.9 2.4 2.4

2.8 2.0 2.0

2.4 2.0 2.0

WATER TEMP. (ºF/ºC)

19

2.7

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
WATER FLOW FOR CONDENSER 59 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]

8,900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

60

8. KM-660MRJ with URC-5F

y

Specification Sheet

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 16.1 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1400 (5.60) 1270 (4.72)
WATER gal./24HR (gal./100 lbs.) 88 (14.7) 213 (32.9)
ICE PRODUCTION PER CYCLE 10.4 lbs. (4.7 kg) 480pcs.
BIN CONTROL SYSTEM Ultra-Sonic Sensor
REFRIGERANT CHARGE TOTAL R404A, 4 lb. 2.7 oz. (1890g)

ICEMAKER, 2 lb. 4.7 oz. (1040g)
CONDENSER, 1 lb. 14 oz. (850g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./da
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)

70/21 646 293
80/27 636 289 616 279 592 269
90/32 633 287 602 273 578 262

100/38 628 285 596 270 557 253

70/21
80/27
90/32

70/21 213 0.80
80/27 185 0.70 128 0.49 134 0.51
90/32 176 0.67 88 0.33 85 0.32

100/38 136 0.52 87 0.33 82 0.31

70/21
80/27
90/32

70/21
80/27
90/32

70/21 215 15.1
80/27 228 16.0 254 17.9 285 20.0
90/32 232 16.3 273 19.2 303 21.3

100/38 239 16.8 280 19.7 330 23.2

70/21 40 2.8 41 2.9 44 3.1
80/27 41 2.9 43 3.1 46 3.2
90/32 41 2.9 45 3.2 48 3.3

100/38 42 3.0 46 3.2 50 3.5

50/10 70/21 90/32

1270 1308 1359
1299 1358 1409
1308 1400 1452
1318 1412 1500

20 21 22
20 22 24
21 23 25
21 24

3.5 3.0

3.1 2.5 2.6

3.0 2.0 2.0

2.6 2.0 2.0

WATER TEMP. (ºF/ºC)

633 287 612 277

176 0.67 162 0.61

26

2.9

232 16.3 260 18.3

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME 43 CU. IN. URC-5F

8,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

61

B. Wiring Diagrams

1. KM-350M_J, KM-520M_J, KM-660M_J

* High-Pressure Switch

PSIG

0

22

PSIG 412±

0

22

Water-Cooled Model Air and Remote Models

*

Cut-in 284±22 PSIG 327±22 PSIG

Cut-out 384±

62