Hoshizaki JWE-2400CUA-R-25B User Manual

NO. J002-794
ISSUED: APR. 1, 2011
REVISED: SEP. 6, 2011

MODEL

HOSHIZAKI

DISHWASHER

JWE-2400CUA-L-25B
JWE-2400CUA-R-25B

SERVICE MANUAL

IMPORTANT

Only qualifi ed service technicians should install, service, and maintain the
unit. No service or maintenance should be undertaken until the technician
has thoroughly read this Service Manual. Failure to service and maintain
the equipment in accordance with this manual may adversely affect safety,
performance, component life, and warranty coverage.

Hoshizaki provides this manual primarily to assist qualifi ed service technicians in the
maintenance and service of the unit.

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

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department
Phone: [phone] Technical Support

[phone]
Fax: [phone]
[phone]
E-mail: [e-mail]

Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

IMPORTANT

This manual should be read carefully before the unit is serviced or maintenance
operations are performed. Only qualifi ed service technicians should install,
service, and maintain the unit. Read the warnings contained in this booklet
carefully as they give important information regarding safety. Please retain this
booklet for any further reference that may be necessary.

CONTENTS

I. Specifi cations ------------------------------------------------------------------------------------------------ 1

A. Specifi cation Sheet ------------------------------------------------------------------------------------- 1

1. JWE-2400CUA-L-25B ------------------------------------------------------------------------------ 1

2. JWE-2400CUA-R-25B ------------------------------------------------------------------------------2
B. Nameplate Rating --------------------------------------------------------------------------------------- 3
C. Dimensions/Connections ------------------------------------------------------------------------------ 4

1. JWE-2400CUA-L-25B ------------------------------------------------------------------------------ 4

2. JWE-2400CUA-R-25B ------------------------------------------------------------------------------5

II. General Information ---------------------------------------------------------------------------------------- 6

A. Construction ---------------------------------------------------------------------------------------------- 6

1. Dishwasher -------------------------------------------------------------------------------------------- 6

2. Booster Tank ------------------------------------------------------------------------------------------7

3. Control Box -------------------------------------------------------------------------------------------- 8
B. Functions -------------------------------------------------------------------------------------------------- 9

1. Increasing Rinse Water Flow Rate -------------------------------------------------------------- 9
C. Sequence of Operation -------------------------------------------------------------------------------- 9

1. Auto Fill Cycle ----------------------------------------------------------------------------------------- 9

2. Ready Cycle (Unit Inactive) ----------------------------------------------------------------------10

3. Wash Cycle/Rinse Cycle --------------------------------------------------------------------------10

4. Table Limit Switch -----------------------------------------------------------------------------------11

5. Emergency Stop Button ---------------------------------------------------------------------------11

6. Drain----------------------------------------------------------------------------------------------------11
D. Sequence of Operation Flow Chart ----------------------------------------------------------------12
E. Timing Chart ---------------------------------------------------------------------------------------------13

1. Auto Fill Cycle ----------------------------------------------------------------------------------------13

2. Wash Cycle/Rinse Cycle --------------------------------------------------------------------------14
F. Control Board and Operation Board ---------------------------------------------------------------15

1. Control Board Location ----------------------------------------------------------------------------15

2. Control Board Layout ------------------------------------------------------------------------------16

3. Control Board Diagram ----------------------------------------------------------------------------17

4. Operation Panel Layout ---------------------------------------------------------------------------18

5. Features -----------------------------------------------------------------------------------------------18

6. Controls, Adjustments, and Lamps -------------------------------------------------------------18

7. Service Menu and Error Log ---------------------------------------------------------------------19

8. Temperature Display -------------------------------------------------------------------------------21

9. Error Codes ------------------------------------------------------------------------------------------21

10. Buzzer -------------------------------------------------------------------------------------------------21

11. Operation Time Display ----------------------------------------------------------------------------22
i

12. Special Modes ---------------------------------------------------------------------------------------22

III. Service Diagnosis ----------------------------------------------------------------------------------------24

A. Diagnostic Procedure ---------------------------------------------------------------------------------24
B. Error Codes ----------------------------------------------------------------------------------------------26

1. Error Code Table ------------------------------------------------------------------------------------26

2. Error Code Log --------------------------------------------------------------------------------------27

3. Error Code Details ----------------------------------------------------------------------------------28

C. Service Flow Charts -----------------------------------------------------------------------------------41

1. Unit Will Not Start -----------------------------------------------------------------------------------41

2. Dishes Not Clean -----------------------------------------------------------------------------------43

3. Inadequate Rinse -----------------------------------------------------------------------------------45

4. Dishwasher Will Not Start Wash/Rinse Cycle -----------------------------------------------46

5. No or Inadequate Detergent/Rinse Aid Supply ----------------------------------------------47

6. Wash Tank Water Boils ----------------------------------------------------------------------------47

7. Wash Tank Water Not Draining ------------------------------------------------------------------48

D. Float Switch Check and Cleaning ------------------------------------------------------------------49

1. Float Switch Check ---------------------------------------------------------------------------------49

2. Float Switch Cleaning ------------------------------------------------------------------------------49

E. Thermistor Check --------------------------------------------------------------------------------------50

IV. Removal and Replacement of Components -------------------------------------------------------51

A. Removal of Panels -------------------------------------------------------------------------------------51
B. Removal and Replacement of Wash Pump Motors -------------------------------------------51
C. Removal and Replacement of Rinse Pump Motor ---------------------------------------------52
D. Removal and Replacement of Gear Motor ------------------------------------------------------55
E. Removal and Replacement of Conveyor ---------------------------------------------------------56
F. Removal and Replacement of Crankshaft --------------------------------------------------------57
G. Removal and Replacement of Control Box ------------------------------------------------------58
H. Removal and Replacement of Thermistor -------------------------------------------------------58
I. Removal and Replacement of Control Board or Operation Board --------------------------59

1. Control Board ----------------------------------------------------------------------------------------59

2. Operation Board -------------------------------------------------------------------------------------60
J. Removal and Replacement of Heater -------------------------------------------------------------61
K. Removal and Replacement of Float Switch -----------------------------------------------------62
L. Removal and Replacement of Thermostat -------------------------------------------------------63

V. Cleaning and Maintenance Instructions -------------------------------------------------------------64

A. Daily Maintenance -------------------------------------------------------------------------------------64
B. Weekly Maintenance ----------------------------------------------------------------------------------69

1. Heater --------------------------------------------------------------------------------------------------69

2. Exterior ------------------------------------------------------------------------------------------------69
C. Monthly Maintenance ---------------------------------------------------------------------------------69

1. Water Supply Line ----------------------------------------------------------------------------------69
D. Descaling (As Required) -----------------------------------------------------------------------------70
E. Shutdown -------------------------------------------------------------------------------------------------70
F. Long Storage, Relocation, Disposal, Transfer ---------------------------------------------------72

VI. Operating Instructions -----------------------------------------------------------------------------------72
VII. Technical Information -----------------------------------------------------------------------------------73

A. Water Circuit ---------------------------------------------------------------------------------------------73
B. Wiring Diagram -----------------------------------------------------------------------------------------74

ii

Important Safety Information

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

WARNING

NOTICE

Indicates a situation which could result in damage to the unit or

IMPORTANT

This product 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.

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

• Only qualified service technicians should install, service, and maintain the
unit.

• 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, fi re, or severe damage to
equipment.

• This unit requires independent power supplies for the dishwasher and for the
booster tank. See the nameplate for proper voltage and breaker/fuse sizes.
Failure to use proper breakers or fuses can result in tripped breakers, blown
fuses, or damage to existing wiring. This could lead to heat generation or fi re.

• THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could
result in death or serious injury.

• Use the “ON/OFF” button on the operation panel to turn off the unit, then turn
off the dishwasher and booster tank power supplies before servicing. Lockout/
Tagout to prevent the power supplies from being turned back on inadvertently .

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

• To avoid possible burns and spills, be sure to drain the wash tank and internal
booster tank and let the components cool before servicing. When draining the
internal booster tank, wait until the water temperature falls below 104°F (40°C).

• When disassembling components that have been in contact with detergent,
wear rubber gloves and goggles. Before starting disassembly, thoroughly
read the detergent safety instructions. Contact with skin may cause irritation
and contact with eyes may cause blindness.

• When using an acidic descaling cleaner, wear rubber gloves and goggles.
Contact with skin may cause irritation, and contact with eyes may cause
blindness. Do not use or mix with a dishwashing detergent. Some detergents
may generate toxic chlorine gas.

Indicates a hazardous situation which could result in death or

serious injury.

property.

Indicates important information about the use and care of the

unit.

WARNING

iii

I. Specifi cations
A. Specifi cation Sheet

1. JWE-2400CUA-L-25B

DISHWASHER SIDE BOOSTER SIDE

AC SUPPLY VOLTAGE
POWER SUPPLY CAPACITY

AMPERAGE

STARTING AMPERAGE
ELECTRICAL COMSUMPTION

HEATER

RACK SIZE

NUMBER OF LARGE DISHES / RACK

CAPACITY
WATER COMSUMPTION
PASSING HEIGHT
DIRECTION OF OPERATION
OUTSIDE DIMENSIONS
EXTERIOR
DOOR
LEG
WASH SYSTEM ,RINSE SYSTEM
PUMP
DRAIN SYSTEM
START
DRY SYSTEM
REFUSE DISPOSAL
DETERGENT
DISPLAY

TANK CAPACITY
HOT WATER SUPPLY

TEMPERATURE CONTROL

CONNECTION – WATER SUPPLY
– DRAIN

CONTROL Microprocessor control
BOIL – DRY PROTECTION

SAFETY SYSTEM

WEIGHT Net 430lb (195kg) / Gross 584lb (265kg)

PACKAGE

CERTIFICATION

ACCESSORIES-SUPPLIED

ACCESSORIES-REQUIRED Universal rack (addition), Ventilation hoods x 2, Drain Tempering Kit

OPERATION CONDITIONS

* The rated properties are based on measurements at ambient temperature of 86ºF (30ºC) according to the Technical

Requirements for Electrical Appliances.

* We reserve the right to make changes in specifications and design without prior to notice.

3 phase 3-wire 208-230V/60Hz (±10%) /
208V : 18.4kVA(51.1A)

230V : 22.1kVA(55.5A)
Max Running 51.2A
Rated Motor 9.0A

26.0A
Max 19.86kW
Rated Motor 3.06kW
Power Factor 84%

16.80kW(230V) 25.20kW(230V)
19-3/4" × 19-3/4"(500 × 500mm)
16 plates (9.1” DIA)
240/200/160racks/hour㩷adjustable in 3 steps (rotary switch)
114Gal/hour(432L/hour), 0.48 Gal/rack(1.8L/rack) - at 240rack/hour

20.5" (520mm)
Left to Right
W57.3" × D27.6" × H58.1" (W1,455 × D700 × H1,475mm)
Stainless Steel
Vertically Sliding Service Panel(Opening:W25.6" × H18.9")
Stainless Steel Adjustable 9.4" - 11.0"
Upper and Lower Fixed Spray
Wash 1HP x 2, Rinse 0.134HP
Draw Out Overflow Pipe, Overflow Drain
Rack Detection (Wash/Rinse)
Residual Heat Drying
Filter Collection
Not Provided
Wash Water Temperature / Rinse Water Temperature (selectable by switch)
Ready, Auto Fill, Wash, Error Code

27.2Gal (103L)
Automatic Hot Water Supply by
Microprocessor Control
Wash: 160ºF (71ºC) min.

Thermistor Control: 163ºF(73㩷C) – 168㩷㪝(76C)

Inlet: 3/4"FPT
Outlet: 1-1/2"MPT

Water Level Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
Service Panel Switch, Emergency Stop by Microprocessor Control
Table Limit Switch, Emergency Stop Button, Conveyor Overload Protector

Carton + Crate
W62.6"×D32.9"×H65.9" (W1,590mm ×D 835mm × 1,675mm)
NSF ANSI-3, ETL, cETL, Energy Star
Universal rack (19-3/4" x 19-3/4"), Instruction manual, Installation manual
Maintenance sheet, Curtain(L), Curtain(S) x 2, Shaft - curtain(L), Shaft - curtain (S) x 2
Guard(L), Guard(R), Hook - Drain, Table limit Switch, Upper wash spray arm,
Operation box assembly, Cable cover, Inlet water strainer & Packing

Ambient Temperature: 41 - 95ºF (5ºC - 35ºC), Voltage Range: Rated Voltage ±10%
Recommends Water Hardness : 4gpg (grains per gallon) (68.5ppm) or less
Water Supply Temperature: 110 - 167ºF (43ºC - 75ºC) ( Recommends 140 ºF (60ºC))
Water Supply Pressure (Gauge Static Pressure): 10 - 70PSIG (0.07 - 0.48 MPa)
Exhaust Requirements : 200CFM(Entrance End),400CFM(Discharge End)



2 power supply lines

208V : 20.6kVA(57.2A)
230V : 25.3kVA(63.5A)
Max Running 63.3A

Max 25.20kW

12.4Gal (47L)
Automatic Hot Water Supply by
Water Valve
Rinse: 180ºF (82ºC) min.

Thermistor Control: 182ºF(83ºC)-185ºF (85ºC)

Float Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)

㩷

1

2. JWE-2400CUA-R-25B

DISHWASHER SIDE BOOSTER SIDE

AC SUPPLY VOLTAGE
POWER SUPPLY CAPACITY

AMPERAGE

STARTING AMPERAGE
ELECTRICAL COMSUMPTION

HEATER

RACK SIZE

NUMBER OF LARGE DISHES / RACK

CAPACITY
WATER COMSUMPTION
PASSING HEIGHT
DIRECTION OF OPERATION
OUTSIDE DIMENSIONS
EXTERIOR
DOOR
LEG
WASH SYSTEM ,RINSE SYSTEM
PUMP
DRAIN SYSTEM
START
DRY SYSTEM
REFUSE DISPOSAL
DETERGENT
DISPLAY

TANK CAPACITY
HOT WATER SUPPLY

TEMPERATURE CONTROL

CONNECTION – WATER SUPPLY
– DRAIN

CONTROL Microprocessor control
BOIL – DRY PROTECTION

SAFETY SYSTEM

WEIGHT Net 430lb (195kg) / Gross 584lb (265kg)

PACKAGE

CERTIFICATION

ACCESSORIES-SUPPLIED

ACCESSORIES-REQUIRED Universal rack (addition), Ventilation hoods x 2, Drain Tempering Kit

OPERATION CONDITIONS

* The rated properties are based on measurements at ambient temperature of 86ºF (30ºC) according to the Technical

Requirements for Electrical Appliances.

* We reserve the right to make changes in specifications and design without prior to notice.

3 phase 3-wire 208-230V/60Hz (±10%) /
208V : 18.4kVA(51.1A)

230V : 22.1kVA(55.5A)
Max Running 51.2A
Rated Motor 9.0A

26.0A
Max 19.86kW
Rated Motor 3.06kW
Power Factor 84%

16.80kW(230V) 25.20kW(230V)
19-3/4" × 19-3/4"(500 × 500mm)
16 plates (9.1” DIA)
240/200/160racks/hour㩷adjustable in 3 steps (rotary switch)
114Gal/hour(432L/hour), 0.48 Gal/rack(1.8L/rack) - at 240rack/hour

20.5" (520mm)
Right to Left
W57.3" × D27.6" × H58.1" (W1,455 × D700 × H1,475mm)
Stainless Steel
Vertically Sliding Service Panel(Opening:W25.6" × H18.9")
Stainless Steel Adjustable 9.4" - 11.0"
Upper and Lower Fixed Spray
Wash 1HP x 2, Rinse 0.134HP
Draw Out Overflow Pipe, Overflow Drain
Rack Detection (Wash/Rinse)
Residual Heat Drying
Filter Collection
Not Provided
Wash Water Temperature / Rinse Water Temperature (selectable by switch)
Ready, Auto Fill, Wash, Error Code

27.2Gal (103L)
Automatic Hot Water Supply by
Microprocessor Control
Wash: 160ºF (71ºC) min.

Thermistor Control: 163ºF(73㩷C) – 168㩷㪝(76C)

Inlet: 3/4"FPT
Outlet: 1-1/2"MPT

Water Level Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
Service Panel Switch, Emergency Stop by Microprocessor Control
Table Limit Switch, Emergency Stop Button, Conveyor Overload Protector

Carton + Crate
W62.6"×D32.9"×H65.9" (W1,590mm ×D 835mm × 1,675mm)
NSF ANSI-3, ETL, cETL, Energy Star
Universal rack (19-3/4" x 19-3/4"), Instruction manual, Installation manual
Maintenance sheet, Curtain(L), Curtain(S) x 2, Shaft - curtain(L), Shaft - curtain (S) x 2
Guard(L), Guard(R), Hook - Drain, Table limit Switch, Upper wash spray arm,
Operation box assembly, Cable cover, Inlet water strainer & Packing

Ambient Temperature: 41 - 95ºF (5ºC - 35ºC), Voltage Range: Rated Voltage ±10%
Recommends Water Hardness : 4gpg (grains per gallon) (68.5ppm) or less
Water Supply Temperature: 110 - 167ºF (43ºC - 75ºC) ( Recommends 140 ºF (60ºC))
Water Supply Pressure (Gauge Static Pressure): 10 - 70PSIG (0.07 - 0.48 MPa)
Exhaust Requirements : 200CFM(Entrance End),400CFM(Discharge End)



2 power supply lines

208V : 20.6kVA(57.2A)
230V : 25.3kVA(63.5A)
Max Running 63.3A

Max 25.20kW

12.4Gal (47L)
Automatic Hot Water Supply by
Water Valve
Rinse: 180ºF (82ºC) min.

Thermistor Control: 182ºF(83ºC)-185ºF (85ºC)

Float Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)

㩷

2

B. Nameplate Rating

For certifi cation marks, see the nameplate on the dishwasher.

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

3

C. Dimensions/Connections

1. JWE-2400CUA-L-25B

Units: mm [in.]

4

2. JWE-2400CUA-R-25B

Units: mm [in.]

5

II. General Information
A. Construction

1. Dishwasher

The illustration below shows JWE-2400CUA-L-25B (left-to-right rack fl ow).

Operation Panel

Vertically Sliding

Wash Spray Arm (stationary)

Service Panel

Emergency Stop Button

Rinse Spray Arm (stationary)

Rinse Start Switch

Wash Start Switch

Service Panel Switch

Conveyor Motor

Wash Tank (26 gallons)

Wash Tank Thermistor

Wash Tank Heater

Rack Flow

Water Level Sensor

Wash Pump
(Upper/Lower Spray Arm)

Rinse Pump

Conveyor

Table Limit Switch

Booster Tank

Water Valve

Backup Water
Level Float Switch

Water Level Float Switch

Water Level Safety
Float Switch

Booster Tank Thermistor

Booster Tank Heater

6

2. Booster Tank

Top View

Thermostat Plate

Sheathed Heater [H7 - 15]

Band Heater

Hot Water Outlet Pipe

Overfl ow Pipe

Thermal Protector [TH7 - 12]
(heater boil dry protection)

Front View

Thermal Protector [TH14]

Drain Hose

Inlet Water
Valve [WV]

Inlet Pipe

Water Level Float Switch [FS1]
(downward end)

Backup Water Level Float Switch [FS2]
(upward end)

Water Level Safety Float Switch [FS3]
(downward end)

Thermistor [TH2]
(hot water temperature control)

Strainer

7

3. Control Box

Magnetic Contactor

(Upper Wash Spray Arm PM)

Magnetic Contactor

(Lower Wash Spray Arm PM)

Voltage Tap Switch

Magnetic Contactor

MC1, 2: Wash Tank Heater Control

(MC1: right, MC2: left)

not change settings.

Terminal Block

Inverter

* NOTICE: To prevent failure, do

TB3: Detergent/Rinse Aid Feeder

Magnetic Contactor

MC5 - 7: Booster Tank Heater Contactors

(MC5: upper, MC6: lower left, MC7: lower

right)

Main Transformer

(Control Supply)

Relay

X10: Rinse PM Control

X11: Service Panel Switch

X12: Phase Reversal Relay

X13: Booster Tank Water Valve

X14: Conveyor Drive Signal

X15: Booster Tank Heater Control Relay

Terminal Block

TB1: For Dishwasher

TB2: For Booster Tank

Fan MotorFan

Control Board

Conveyor Speed

Switch

Phase Reversal Relay

Control Transformer

(Control Board)

Buzzer

8

B. Functions

1. Increasing Rinse Water Flow Rate

Upper Rinse Spray Arm

The rinse water fl ow rate is factory adjusted to 1.90 gal/min

Clean Pipe

(7.2 L/min). To increase the fl ow rate to 3.17 gal/min (12 L/

min), follow the steps below. Hot water supply of at least

3.44 gal/min (13 L/min) and 113°F (45°C) will be required.

Lower Rinse
Spray Arm

1) Remove the upper and lower rinse spray arms.

2) Loosen the clean pipe nut, and remove the clean pipe.

Spacer

3) Remove the spacer (with 4.5 mm DIA hole) from the nut at the unit side.

4) Replace the clean pipe and the upper and lower rinse spray arms in their correct positions.

C. Sequence of Operation

The steps in the sequence are as outlined below.

1. Auto Fill Cycle
"AUTO FILL" lamp fl ashing and "RINSE TEMP." or "WASH TEMP." lamp on.

If BT WLF/S is open when the "ON/OFF" button is pressed, WV energizes after BT auto fi ll
delay time (factory default: 10 seconds).
When BT WLF/S closes, WV de-energizes, the "AUTO FILL" lamp fl ashes and the auto fi ll
cycle starts.
RPM energizes for length of time set by the auto fi ll cycle rinse time setting (factory default:
13 minutes). For details, see "Auto Fill Cycle Rinse Time" (service menu item 03) in "II.F.7.b)
Service Menu Chart."
At the end of the auto fi ll cycle, there is a 5-second dwell time. CB checks WT WLS. If WT
WLS is closed, BZ beeps, the "AUTO FILL" lamp goes off and the "READY" lamp comes
on. If WT WLS is open, BZ beeps continuously, the "AUTO FILL" lamp goes off and "A1"
fl ashes in the display. For details, see "III.B.3.a) Auto Fill Error (A1)."
If the BT water level goes down and BT WLF/S opens during the auto fill cycle, WV
energizes after BT auto fi ll delay time (factory default: 10 seconds). For adjustment of this
delay time, see "Booster Tank Auto Fill Delay Time" (service menu item 08) in "II.F.7.b)
Service Menu Chart." If delay time is set shorter, WV energizes/de-energizes frequently
and BT may not supply hot water of proper temperature.
If SP is opened during the auto fi ll cycle, SPS opens, RPM de-energizes. The "AUTO FILL"
lamp keeps flashing and the rinse cycle time keeps counting down. When SPS closes
again, RPM energizes.
If WLS is closed when the "ON/OFF" button is pressed, the "READY" lamp comes on and
the unit is ready to start.

Nut

Note:

1. If SP is opened during the auto fi ll cycle, RPM de-energizes to stop hot water supply.
If SP is left open for a long time, WT may not fi ll by the end of the auto fi ll cycle. In this
case, WT WLS opens when the unit starts, and the supplementary fi ll cycle begins.

2. WTH is energized when WT WLS closes during the auto fi ll cycle.

3. BTH is energized during the auto fi ll cycle if WLSF/S is closed.

9

4. If BT WLF/S fails, BT BUWLF/S assumes control. If BT BUWLF/S remains closed for 1
minute, o1 or o2 error appears in the display. For details, see "III.B. Error Codes."

5. The wash/rinse start switch is inactive during the auto fi ll cycle.

2. Ready Cycle (Unit Inactive)

"READY" lamp and "RINSE TEMP." or "WASH TEMP." lamp on.

WT WLS closed. After a rinse cycle, RPM de-energizes, and the "READY" lamp comes on.
WTH energizes when WT water temperature is at the wash temperature setpoint or
lower. WTH de-energizes when WT water temperature is 5°F (3°C) above the setpoint.
For details, see "Wash Temperature Setpoint" (service menu item 04) in "II.F.7.b) Service
Menu Chart."
BTH energizes when BT water temperature is 3°F (2°C) below the rinse temperature
setpoint or lower. BTH de-energizes when BT water temperature reaches the setpoint.
WV energizes/de-energizes when BT WLF/S opens/closes. For details, see "Rinse
Temperature Setpoint" (service menu item 05) in "II.F.7.b) Service Menu Chart."

Note:

1. The thermistors control WT and BT water temperatures.

2. If one of the thermistors has an open or short circuit, WTH or BTH de-energizes and an
error code appears in the display.

3. WTH and BTH are controlled regardless of SPS operation.

3. Wash Cycle/Rinse Cycle

"WASH" lamp and "RINSE TEMP." or "WASH TEMP." lamp on.

When a rack is loaded from the wash compartment entrance and the wash start switch
closes, WPM energizes, power is supplied to DFT and the "WASH" lamp comes on. WPM
draws water from WT and sends it through the wash spray arms. The upper spray arm
WPM starts fi rst, followed by the lower spray arm WPM. Then, the conveyor starts to move
the rack. After the wash start switch opens and the extended wash cycle time (factory
default: 30 seconds) has expired, WPM de-energizes and power is cut to DFT. For details,
see "Extended Wash Cycle Time" (service menu item 01) in "II.F.7.b) Service Menu Chart."
When the rinse start switch closes, RPM energizes and power is supplied to RFT. RPM
draws water from BT and sends it through the rinse spray arms. Rinse aid is fed into the
rinse water line and sprayed from the rinse spray arms together with rinse water. Any
excess water in WT drains through the overfl ow pipe. After the rinse start switch opens
and the extended rinse cycle time (factory default: 15 seconds) has expired, RPM de­energizes, power is cut to RFT, the "WASH" lamp goes off and the "READY" lamp comes
on. For details, see "Extended Rinse Cycle Time" (service menu item 02) in "II.F.7.b)
Service Menu Chart."
After both WPM and RPM de-energize, the conveyor stops. If SP is opened during
operation, SPS opens, WPM and RPM de-energize and the conveyor stops. If the wash/
rinse start switch is closed when SPS closes, WPM and RPM energize and the conveyor
restarts.

Note:

1. If WT WLS opens after WPM energizes, WPM de-energizes and RPM energizes for
the supplementary fi ll cycle time (factory default: 450 seconds) to supply hot water into

10

WT. The conveyor does not start during the supplementary fi ll cycle. "A3" appears in the
display and the "AUTO FILL" lamp fl ashes. BZ beeps three times only at the beginning.
If WT WLS is still open after the supplementary fi ll cycle, another cycle starts. If WT
WLS still does not close, "A3" appears in the display, BZ beeps and the unit shuts down.
For adjustment of the supplementary fi ll cycle time, see "Supplementary Fill Cycle Time"
(service menu item 07) in "II.F.7.b) Service Menu Chart." For details, see "III.B.3.c)
Wash Tank Water Level Error (A3)."

2. If WT WLS and the wash start switch are closed after RPM runs for the supplementary
fi ll cycle time, WPM energizes and the conveyor starts.

3. If SP is opened and closed during operation and the wash/rinse start switch is open, the
unit does not resume operation. Load another rack to close the wash start switch. The
unit resumes operation if SP is closed during the extended wash/rinse cycle time.

4. Table Limit Switch

If a rack reaches the end of the clean dishtable and actuates TLS lever (TLS closed),
WPM and RPM de-energize, the conveyor stops and "L1" appears in the display. When
the rack is removed and TLS lever returns to the original position (TLS open), WPM and
RPM energize and the conveyor starts after 3 seconds unless the wash/rinse start switch
is open.

5. Emergency Stop Button

To shut down the unit in case of emergency, press ESB on top of the unit (wash
compartment exit side). To resume operation, turn ESB clockwise to unlock and press the
"ON/OFF" button on the operation panel.

Note: The unit is inoperative without ESB connected at the time of installation.

6. Drain

This unit does not have a drain valve.
The overfl ow pipe in WT drains excess water from WT. To completely drain WT, remove
the overfl ow pipe.
To drain BT, use the “ON/OFF” button on the operation panel to turn off the unit, then turn
off the dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power
supplies from being turned back on inadvertently.

Use BT drain hose to drain BT. WARNING! To avoid possible burns, allow BT water

temperature to fall below 104°F (40°C) before draining.

Legend: BT–booster tank; BTH–booster tank heater; BUWLF/S–backup water level fl oat

switch; BZ–buzzer; CB–control board; DFT–detergent feeder terminals (detergent
feeder not provided by Hoshizaki); DS–door switch; ESB–emergency stop button;

RFT–rinse aid feeder terminals (rinse aid feeder not provided by Hoshizaki);
RPM–rinse pump motor; SP–service panel; SPS–service panel switch; WLSF/
S–water level safety float switch; TLS–table limit switch; WLF/S–water level
fl oat switch; WLS–water level sensor; WPM–wash pump motor; WT–wash tank;
WTH–wash tank heater; WV–inlet water valve

11

D. Sequence of Operation Flow Chart

p

g

y
g

g

y

g

g

(

g

(

g

(
g

g

g

g

g

g

g

g

g

g

g

g

g

g

g

g
g

g

y

g
g

g

g

g

g

g
g

g

y

g

g

y

g

g

g

p

g

p

g

g

g

ized

ens

ized

BT WLF/S

ized b

followed by the lower spray arm WPM

JWE-2400CUA-25B

WT WLS

monitored

during Wash

power supplied to RFT

ized when RSS opens

ized

power supplied to DFT RPM ener

ized when WSS opens RPM de-ener

ized

WPM de-ener

and the extended wash cycle time and the extended rinse cycle time

ized when WT water temp. at

ized while WPM and RPM ener

ized GM ener

ized when WT water temp. at WTH ener

ized when WPM ener

GM ener

WTH ener

de-energized) de-energized)

ized when WT water temp.

ized when WT water temp. WTH de-ener

WTH de-ener

wash temp. setpoint (service menu item wash temp. setpoint (service menu item

is 5ºF (3ºC) above wash temp. setpoint is 5ºF (3ºC) above wash temp. setpoint

ized b

ized when BT water temp.

ized when BT water temp. 3ºF

ized when BT water temp. BTH de-ener

ized when BT water temp. 3ºF BTH ener

BTH de-ener

menu item 05) or lower menu item 05) or lower

ized when BT WLSF/S

ized/de-ener

BT WLF/S WV ener

ized b

ized when BT WLSF/S BTH de-ener

ized/de-ener

WV ener

BTH de-ener

reaches rinse temp. setpoint (service reaches rinse temp. setpoint (service

menu item 05) menu item 05)

opens opens

ized when WT WLS o

ized when WTH ener

FCT ener

ens WTH de-ener

WT WLS

ized when WT WLS o

ized when WPM

FCT ener

WTH de-ener

energized

WPM and GM de-energized

RPM energized

(time=service menu item 07)

WT WLS open

"A3"error appears in display.

repeats twice

ized when WT water

Dishwasher Sequence Flow Chart

WT WLS closed

WT WLS

WT WLS check.

• SPS must be closed for RPM to energize • Cycle started by wash start switch • Cycle started by rinse start switch

• RPM time: (service menu item 03) • SPS must be closed for WPM to energize • SPS must be closed for RPM to energize

• RFT de-energized during Auto Fill Cycle • The upper spray arm WPM starts first,

ins here

Cycle Steps 1. Auto Fill Cycle 2. Ready Cycle (Unit Inactive) 3. Wash Cycle 4. Rinse Cycle

Initial startu

be

ized when WT water temp. WPM ener

WTH de-ener

WTH ener

item 04) or lower

check

ized b

time=service menu

ized

ized/de-ener

cle if closed.

BT WLF/S at wash temp. setpoint (service menu when WPM energized) when RPM energized)

RPM ener

item 03)

WV ener

Go to Ready

C

temp. is 5ºF (3ºC) above wash temp. (service menu item 01) has expired (service menu item 02) has expired

ized when BT WLSF/S

closed setpoint (service menu item 04) (power cut to DFT when WPM (power cut to RFT when RPM

BTH ener

ized when BT water

ized when BT water temp.

BTH de-ener

temp. reaches rinse temp. setpoint 04) or lower 04) or lower

(service menu item 05) or lower

ized when RPM

ized when WT WLS BTH ener

FCT ener

WTH ener

closed 3ºF (2ºC) below rinse temp. setpoint

energized

ized when BT WLSF/S BTH ener

ized/de-ener

WV ener

(service menu item 05)

BT WLF/S (service menu item 04) (service menu item 04)

BTH de-ener

WT WLS open

"A1" error appears

in display.

ized

ized when WT WLS

"A3"error appears

FCT de-ener

WTH de-ener

opens (2ºC) below rinse temp. setpoint (service (2ºC) below rinse temp. setpoint (service

opens

Legend:

BT–internal booster tank

BTH–internal booster tank heater

DFT–detergent feeder terminals

GM-gear motor (conveyor)

RFT–rinse aid feeder terminals

RPM–rinse pump motor

RSS-rinse start switch

in display.

SPS–service panel switch

VFCT-vent fan control terminals

WLF/S–water level float switch

unit shuts down

WLS–water level sensor

WLSF/S-water level safety float switch

WPM–wash pump motor

WSS-wash start switch

WT–wash tank

WTH–wash tank heater

WV–inlet water valve

12

E. Timing Chart

u

1. Auto Fill Cycle

Note 2

(Repeat)

Service menu item 03

Approx. 13 gal (50L) water level

Note 1 Note 1

Auto Fill Cycle Rinse Time (*13 min) 2 gal (7.8L)/min x 13 min = 20 gal (101L)

Note 3

If the booster tank water level float switch does not close after 10 minutes in booster tank auto fill, error code "A2" (booster tank auto

Booster tank auto fill delay time (*10 seconds): If auto fill cycle starts immediately after the booster tank water level float switch opens,

the booster tank fills up too soon, and the water valve energizes/de-energizes frequently, resulting in no hot water supply.

Note 1:

After the rinse pump motor de-energizes, there is a 5-second dwell time to stabilize the water level before checking the water level

Note 2:

* Factory default, adjustable by service men

OFF

OFF

OFF

OFF

OPEN

OFF

OFF

OPEN

CLOSED

OPEN

CLOSED

OPEN

OFF

OPEN

OFF

OFF

fill error) appears in the display, and the unit shuts down.

sensor status.

Note 3:

"ON/OFF" Button ON

"AUTO FILL" Lamp ON

"READY" Lamp ON

"WASH" Lamp ON

Service Panel Switch CLOSED

Rinse Pump ON

Water Valve ON

Water Level Float Switch CLOSED

Backup Water Level

Float Switch

Water Level Safety Float

Switch

Booster Tank Thermistor Setpoint

Booster Tank Heater ON

Water Level Sensor CLOSED

Buzzer ON

Wash Tank Heater ON

Booster Tank

13

2. Wash Cycle/Rinse Cycle

u

y

g

g

y

g

y

y

(

)

Note 3

Service menu item 02

cle continuesNote 1:

cle continues

ize

Extended Rinse Cycle Time (*15 sec)

Note 2

Service menu item 01

Extended Wash Cycle Time (*30 sec)

Note 1

Note 4

Load rack

Note 4

0.5 sec

Time

Dela

this time to close the wash start switch, wash c

this time to close the rinse start switch, rinse c

or stops when both the wash pump and the rinse pump de-ener

* Factory default, adjustable by service men

If another rack is loaded durin

wash/rinse cycle.

Note 2: If another rack is loaded durin

Note 3: The conve

Note 4: The rack handle shape opens the wash/rinse start switch for a moment. But the extended wash/rinse cycle time prevents interruption of the

OFF

OFF

OFF

OFF

OPEN

OPEN

OPEN

OFF

OFF

OPEN

OFF

OFF

OFF

Setpoint

OFF

"ON/OFF" Button ON

"AUTO FILL" Lamp ON

"READY" Lamp ON

"WASH" Lamp ON

Service Panel Switch CLOSED

Water Level Sensor CLOSED

Wash Start Switch CLOSED

Upper Wash Pump ON

Lower Wash Pump ON

Rinse Start Switch CLOSED

Rinse Pump ON

Conveyor (Gear Motor) ON

Buzzer ON

Wash Tank Thermistor

Wash Tank Heater ON

14

F. Control Board and Operation Board

• A Hoshizaki exclusive solid-state control board and operation board are employed in all

Hoshizaki dishwasher units.

• All models are pretested and factory set.

NOTICE

1. The control board and operation board are fragile; handle very carefully.

2. The control board and operation board contain integrated circuits, which
are susceptible to failure due to static discharge. It is especially important to
touch the metal part of the unit when handling or replacing the control board
or operation board.

3. Do not touch the electronic devices on the control board or operation board
or the back of the control board or operation board.

4. Do not attempt to repair the control board or operation board.

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

1. Control Board Location

The control box is located behind the front panel. Follow the instructions and warnings for
safe and effi cient operation of the unit.

Control Box

15

2. Control Board Layout

Inputs and outputs are laid out on the control board as illustrated below.







Signal Input XA Connector (10P)

Signal Input XA Connector (6P)



Thermistor Signal Input



XA Connector (4P)



























4

1

8

1

5

1

1

CN7

CN6

CN5

CN8

10

1

CN11

3

CN9

Low

Buzzer Volume

CN13

Buzzer Output XA Connector (2P)

Power Input VH Connector (4P)

2

16

CN10

High

112

VR1

CN12

1 4

CN1

X1

X2

X3

X4

X5

X6

X7

13

CN2

1

6

1

7

CN3

1

5

CN4

Power Input VH Connector (6P)

Output VH Connector (7P)

Output VH Connector (5P)



Operation Board XA Connector (5P)











XH Connector (3P): not in use

XH Connector (2P): not in use

Booster Tank Water Level Safety

Signal Input XA Connector (3P)

16

3. Control Board Diagram

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

(

)

1

y







200VAC from Transformer





Transformer

11V 7.7V



[Communication]
Operation Panel
Board

Shielded Wire

Wash Tank Thermistor

Booster Tank Thermistor

Booster Tank Water
Level Safet

Float Switch

Buzzer Output

1(CN1)41 (CN2)6

1

5

CN5

1

4

CN7

3
2

CN11

1

2

CN10

X1

X2

X3

X4

X5

X6

X7

CN3

CN4

2

1

X15

3

MC1

5

X10

7

MC3

1

X13

3

MC4

5

X14

Booster Tank Heater

Wash Tank Heater

Rinse Pump

Upper Wash Pump

Water Valve

Lower Wash Pump

Conveyor

Wash Tank Electrode
(Water Level Sensor)

Connector Voltages

5
6

CN9

1

CN6

Table Limit Switch + Conveyor Overload

Booster Tank Water Level Float Switch

Booster Tank Backup Water Level Float Switch

CN2 : 200VAC
CN3 : 12VDC
CN4 : 12VDC
CN5 : 5VDC
CN7 : 5VDC
CN8 : 12VDC
CN9 : 1-2: 6VAC

5-6: 12VDC

CN12

CN13

10

CN8

Wash Start Switch

Rinse Start Switch

CN10 : 12VDC
CN11 : 12VDC

*1 Connectors CN 1 - 4 are VH Connectors

17

4. Operation Panel Layout

The operation panel is mounted

on top of the unit (wash compartment exit side) and is

connected to the CN5 connector on the control board.

Water Temperature
Lamps

"AUTO FILL" Lamp

"READY" Lamp

"WASH" Lamp

Up Button

Down Button

Display

"CHANGE" Button

"ON/OFF" Button

5. Features

a) Display

This operation board uses an LED display to show system details and diagnostic
information.

b) Service Menu and Error Log

A service menu ("01" to "19" and "21" to "25") allows for viewing and setting of system
operating details and parameters. See "II.F.7. Service Menu and Error Log."

c) Error Codes

Error codes ("A1" to "A3," "H1" to "H6," "L1," "L2," "b1," "b2," "o1," "o2") are designed to
protect the unit. These codes give information or warnings in the event the unit is operating
out of acceptable parameters. See "III.B. Error Codes."

6. Controls, Adjustments, and Lamps

a) Water Temperature Lamps

Light up to indicate the water temperature shown in the display.

b) "AUTO FILL" Lamp

Flashes during the auto fi ll cycle, and goes off at the end of the cycle.

18

"READY" Lamp

c)

Lights up when the auto fi ll cycle completes and the dishwasher is ready to wash.

"WASH" Lamp

d)

Lights up during washing operation.

e) Up Button, Down Button

Indicates the total hours of operations in six digits by two digits each time.
Example: 123,456 hours are indicated by
Press to stop the beep in case of error.
Service personnel also use these buttons to change the controller settings.

f) Display

Indicates wash water temperature in wash cycle, rinse water temperature in rinse cycle,
and error codes in case of trouble.

"CHANGE" Button

g)

Press to change the wash water temperature shown in the display to the rinse water
temperature.

"ON/OFF" Button

h)

Turns on/off the power for operation.

i) Conveyor Speed Switch

Located on front panel. Changes the rack conveyor speed in three levels (high = 240
racks/hour, medium = 200 racks/hour, low = 160 racks/hour).

7. Service Menu and Error Log

The service menu ("01" to "19" and "21" to "25") may be used to change settings, acquire
diagnostic information, and to view error history.

a) Service Menu Access

• Enter Service Menu: Use the "ON/OFF" button to turn off the unit. Press and hold the
"CHANGE" button, then press the "ON/OFF" button. "01" should appear on the display.

• Scroll: Use the up and down arrow buttons to scroll through the service menu list, settings,
and data.

• View Service Menu Setting: Press the "CHANGE" button to view the selected menu
setting.

• Change Setting: Use the up and down arrow buttons to change the setting value.

• Return to Service Menu List: Press the "CHANGE" button once again to return to the main
service menu list.

• Exit Service Menu and Save Settings: Press the "ON/OFF" button to exit the service menu
and save the settings. The display goes blank.

19