Hoshizaki JWE-620UA-6B User manual

JWE-620UA-6B
DISHWASHER
INSTRUCTION MANUAL
FOR END USER 9180VC10B (041111)

i
IMPORTANT
Only qualified service technicians should install, service and maintain the
product. No installation, service or maintenance should be undertaken until
the technician has thoroughly read this Instruction Manual. Likewise, the
owner/manager should not proceed to operate the product until the installer
has instructed them on its proper operation. Failure to install, operate, 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 qualified service technicians in the
installation, maintenance, and service of the product.
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: [email protected]
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.

ii
IMPORTANT
This manual should be read carefully before the product is installed and
operated. Only qualified service technicians should install, service, and
maintain the product. 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 PAGE
1. CONSTRUCTION --------------------------------------------------------------------------------------1
[a] GENERAL--------------------------------------------------------------------------------------------1
[b] OPERATION PANEL-------------------------------------------------------------------------------3
[c] ACCESSORIES-------------------------------------------------------------------------------------4
2. CHECKS BEFORE OPERATION-------------------------------------------------------------------4
[a] CHECKS AFTER INSTALLATION--------------------------------------------------------------5
[b] WATER REQUIREMENTS-----------------------------------------------------------------------5
[c] CHECKS BEFORE OPERATION---------------------------------------------------------------5
3. CHECKING DETERGENT TANK AND RINSE AID TANK------------------------------------6
4. PREPARING THE WASH COMPARTMENT-----------------------------------------------------6
[a] AUTO FILL -------------------------------------------------------------------------------------------8
5. LOADING -------------------------------------------------------------------------------------------------8
[a] PREWASH -------------------------------------------------------------------------------------------8
[b] LOADING DISHES---------------------------------------------------------------------------------9
[c] LOADING RACK------------------------------------------------------------------------------------9
6. WASH AND RINSE----------------------------------------------------------------------------------- 10
[a] OPERATING TEMPERATURES-------------------------------------------------------------- 10
[b] MODE SETTING --------------------------------------------------------------------------------- 10
7. UNLOADING--------------------------------------------------------------------------------------------11
8. INSUFFICIENT WASHING RESULTS------------------------------------------------------------11
9. SHUTDOWN------------------------------------------------------------------------------------------- 12
10. INTERRUPTION-------------------------------------------------------------------------------------- 13
11. STANDBY/CLEANING BUTTON ----------------------------------------------------------------- 14
12. INTERNAL BOOSTER TANK ENERGY SAVING CONTROL----------------------------- 14

iii
13. LOW WATER TEMPERATURE LOCK FUNCTION------------------------------------------ 14
14. ALERT FUNCTION----------------------------------------------------------------------------------- 14
15. DAILY MAINTENANCE ----------------------------------------------------------------------------- 15
16. SELF-CLEANING------------------------------------------------------------------------------------- 17
17. WEEKLY MAINTENANCE-------------------------------------------------------------------------- 18
[a] HEATER -------------------------------------------------------------------------------------------- 18
[b] EXTERIOR----------------------------------------------------------------------------------------- 18
[c] WASH COMPARTMENT------------------------------------------------------------------------ 19
18. MONTHLY INSPECTION--------------------------------------------------------------------------- 19
[a] POWER SWITCH (GROUND FAULT CIRCUIT INTERRUPTER)------------------- 19
[b] WATER SUPPLY LINE-------------------------------------------------------------------------- 19
19. DESCALING (AS REQUIRED)-------------------------------------------------------------------- 20
20. TROUBLESHOOTING ------------------------------------------------------------------------------ 21
[a] TROUBLES REQUIRING IMMEDIATE SERVICE CALL-------------------------------- 21
[b] TROUBLES REQUIRING CHECK BY USER---------------------------------------------- 21
[c] TROUBLES WITHOUT ERROR CODE INDICATION ----------------------------------- 22
21. LONG STORAGE, RELOCATION, DISPOSAL, TRANSFER----------------------------- 23

iv
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 Indicates a hazardous situation which could result in death or
serious injury.
CAUTION Indicates a situation which could result in damage to the unit.
IMPORTANT Indicates important information about the use and care of the
unit.
WARNING
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 fire, follow
basic precautions including the following:
• 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, fire, 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
fire.
• THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit
could result in death or serious injury.
• This unit should be disassembled or repaired only by qualified service
personnel to reduce the risk of electric shock, injury, or fire.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, fire, or damage to the unit.

1
1. CONSTRUCTION
[a] GENERAL
[1]
[2]
[3]
[4]
[5] [6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
Rear View

2
[1] Upper Rinse Spray Arm, Lower Rinse Spray Arm
Rotates and sprays rinse water onto dishes to rinse off detergent.
[2] Upper Wash Spray Arm, Lower Wash Spray Arm
Rotates and sprays wash water onto dishes to remove stains.
[3] Heater
Keeps wash water at a proper temperature.
[4] Water Level Sensor
Detects wash water level.
[5] Handle
[6] Door
[7] Operation Panel
See “[b] OPERATION PANEL”.
[8] Rack Rail
[9] Drain Pipe
Pull out to drain.
[10] Separator
[11] Tank Filter
Separates wash water and scraps.
[12] Pump Filter
Prevents scraps from being drawn into the pump.
[13] Power Switch (Ground Fault Circuit Interrupter)
Move the lever to start up or shut down the unit. Automatically turns off the power in
case of a ground fault.
[14] Vent

3
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[b] OPERATION PANEL
[1] “READY” Lamp
Lights up when the auto fill cycle completes and the dishwasher is ready to wash.
[2] “AUTO FILL” Lamp
Flashes during the auto fill cycle, and goes off at the end of the cycle.
[3] Mode Lamps
Light up to indicate the selected operation mode, and flash during operation.
[4] Standby Lamp
Lights up when the dishwasher is in the standby mode. The unit will not start even
when the door is closed with this lamp on. See “11. STANDBY/CLEANING BUTTON”.

4
[5] Up Button, Down Button
Indicates the total number of operation in six digits by two digits each time.
Example: 123,456 times are indicated by
Press to indicate rinse water temperature instead of wash water temperature while
the dishwasher is on standby.
Service personnel also use these buttons to change the controller settings.
[6] Display
Indicates wash water temperature in wash cycle, rinse water temperature in rinse
cycle, and error codes in case of trouble. See “20. TROUBLESHOOTING”.
[7] “MODE” Button
Press to change the selected operation mode. See “6. WASH AND RINSE”.
[8] “STANDBY/CLEANING” Button
Press to make the dishwasher inoperable even when the door is closed. See “11.
STANDBY/CLEANING BUTTON”.
Press and hold to start self-cleaning with the “ON/OFF” button off. See “16. SELF-
CLEANING”.
[9] “ON/OFF” Button
Turns on/off the power for operation.
[c] ACCESSORIES
Instruction manual x 1 Installation manual x 1
Universal rack x 1 Maintenance sheet x 1
Required for installation:
Operation panel x 1 Plate - rack guide x 1
Screw - bolt (stainless steel 5x12) x 2 Inlet water strainer & gasket x 1
2. CHECKS BEFORE OPERATION
WARNING
1. To prevent possible water leak, electric shock or fire, the installation must be
carried out by qualified personnel.
2. To use a gas water heater, thoroughly read its instruction manual. Ensure
adequate air intake and exhaust systems and exhaust hoods in accordance
with applicable laws for the type and capacity of the heater to prevent
dangerous conditions due to lack of oxygen and toxic gas generation.

5
[a] CHECKS AFTER INSTALLATION
* In the presence of the installer, check for proper installation according to the installation
manual provided.
* Receive the installation manual from the installer, and keep it for later reference.
[b] WATER REQUIREMENTS
* Proper water quality can improve warewashing performance by reducing spotting,
lowering chemical supply costs, improving productivity and extending equipment life.
Local water conditions vary. The recommended proper water treatment for effective and
efficient use of this equipment will also vary depending on the local water conditions. Ask
your municipal water supplier for details about local water specifics prior to installation.
* Recommended water hardness is not more than 4 grains of hardness per gallon.
Chlorides must not exceed 50 parts per million. Water hardness above 4 grains per gallon
should be treated by a water softener or in-line treatment. Water treatment has been
shown to reduce costs associated with machine cleaning, reduce the need for deliming
the dishwasher, reduce detergent usage and reduce corrosion of metallic surfaces in the
internal booster tank and dishwasher.
* Sediment, silica, chlorides or other dissolved solids may lead to a recommendation for
particulate filtration or reverse osmosis treatment.
* If an inspection of the dishwasher or internal booster tank reveals lime build-up after
the equipment has been in service, in-line water treatment should be considered, and,
if recommended, should be installed and used as directed. Contact an authorized
Hoshizaki service company for specific recommendations.
[c] CHECKS BEFORE OPERATION
* Ambient temperature should be within 41 to 95°F (5 to 35°C). Operation of the unit for
extended periods outside of this normal temperature range may affect performance.
WARNING
To avoid the risk of corrosion, clogging and health problems, be sure to use
potable water.
* To prevent water leaks resulting in damage to the surrounding property, keep the water
supply pressure within 10 to 70 PSIG. If the water pressure is too high, a pressure
reducing valve (option) must be installed according to the water heater’s instruction
manual.

6
* The power supply voltage and capacity must be as follows:
Power supply voltage: 208 - 230V / 60Hz / 3Ph
Operating limits: 187 - 253V
Maximum breaker/fuse size: 50A
Minimum circuit ampacity: 50A
* The wash compartment has been cleaned before shipping. But clean it again before
starting up the unit, and check for proper installation of each part. See “15. DAILY
MAINTENANCE”.
* Check the electrical, water, and drain connections before starting up the unit. See “18.
MONTHLY INSPECTION”.
* Always use a dishwasher detergent instead of a neutral detergent for kitchen use.
(Some dishwasher detergents are not suitable. Contact an authorized Hoshizaki service
company for further details.)
3. CHECKING DETERGENT TANK AND RINSE AID TANK
* Follow the instructions of the detergent and rinse aid suppliers to check the detergent
tank and rinse aid tank safely.
IMPORTANT
Be sure to read the warning and caution labels attached to the detergent tank
and rinse aid tank.
4. PREPARING THE WASH COMPARTMENT
* Check that the wash compartment has been cleaned with all the parts in place. If not,
clean the wash compartment according to “13. DAILY MAINTENANCE”, and install the
parts following the instructions below.

7
Upper Wash Spray Arm
Upper Rinse
Spray Arm
Upper Spray Arm Holder
Lower Wash Spray Arm
Lower Rinse Spray Arm
Pump Filter
Tank Filter
Drain Pipe
Dishtable
Dishtable
1) Check that the tank filters and drain pipe are
in place.
2) Lower the rack rail. With the rack rail lifted
up, the door cannot be closed and the unit
will not operate.
3) Turn on the power supply to the water heater.
Insert drain pipe
securely
Place left and right
tank filters in
position
Wash Compartment
Power Switch (GFCI)
4) Open the cover in the front, and move the power switch (GFCI) to the “ON” position.
5) Press the “ON/OFF” button. The display lights up. (If the door is closed, the auto fill
cycle begins.)

8
[a] AUTO FILL
The auto fill cycle refers to automatically repeated starts and stops of the unit to fill the
wash tank with enough hot water for washing. The unit starts and stops about 24 times
and the cycle takes around 11 minutes (supply voltage: 208V, hot water supply: 24 PSIG,
143°F). Then, the dishwasher is ready for washing.
1) Close the door. The “AUTO FILL” lamp flashes, and the auto fill cycle starts.
2) After the auto fill cycle completes, the unit stops, the “READY” lamp lights up (“AUTO
FILL” lamp goes off), and the buzzer sounds.
IMPORTANT
If the dishwasher has been drained
out to prevent freezing, close the
drain valve before opening the water
supply line shut-off valve. With the
drain valve left open, hot water will
be wasted.
5. LOADING
[a] PREWASH
1) Remove any leftovers (ex. meat, fish, vegetables), chopsticks, toothpicks, straws, paper
products and plastics from the dishes. Never use steel wool on ware to be loaded into
the dishwasher.
CAUTION
Do not put these scraps in the dishwasher, as this may cause reduction in wash
performance or failure.
2) To remove heavy soils such as baked gratin and steamed egg or rice, soak the dishes in
hot water before loading them in the dishwasher.
IMPORTANT
1. Do not allow a large amount of neutral detergent in the dishwasher.
2. Use a suitable rack for dishes.
Water Heater
Gas Supply Line
Shut-off Valve
Water Supply Line
Shut-off Valve Water
Gas
Water Supply Valve
Drain Valve
Dishwasher

9
[b] LOADING DISHES
1) Place the rack on the dishtable.
2) Keep the dishes within the rack, otherwise they
may be damaged.
3) Do not stack the dishes, otherwise they cannot be
washed properly.
4) Load glasses upside down into the glassware
rack, otherwise they cannot be washed properly
and rinsed thoroughly or they may touch each
other and be damaged.
Dishes or cups with a deep bottom rim cannot be
rinsed thoroughly with wash water left inside the
rim. Load them as shown below.
If the above loading is not practical, the rinse cycle
time must be extended. Contact an authorized
Hoshizaki service company for further details.
5) The door opening is about 18” (457 mm) high. Keep the loaded rack lower than this
height. Do not force large items into the dishwasher, otherwise they may be damaged or
block the spray arms.
[c] LOADING RACK
1) Slowly open the door.
2) Push the rack into the center of the dishwasher until it touches the rack guide at the
back. Otherwise, the rack and dishes may get caught on the back of the door, resulting
in damaging the wash and rinse spray arms and dishes.
CAUTION
Do not stack racks. Otherwise, this will
cause reduction in wash performance
or failure.
Correct Incorrect
Stacked Sticking out
Facing up
Correct Incorrect
Correct Incorrect
Water remains
Water remains
Door
Rack

10
6. WASH AND RINSE
[a] OPERATING TEMPERATURES
Operating temperatures are as follows:
Wash Temperature Rinse Temperature
Minimum Recommended Minimum Recommended
150°F (66°C) 150°F (66°C) 180°F (82°C) 180°F (82°C)
[b] MODE SETTING
Standard mode: Normal soils (about 53 seconds)
Long mode: Heavy soils (about 122 seconds)
Rinse mode: Rinse only (6 seconds)
1) Press the “MODE” button until the desired mode is selected and its lamp lights up.
2) Slowly close the door. The selected mode lamp flashes (“READY” lamp goes off), and
washing operation (wash and rinse) starts.
3) When the washing operation completes, the “READY” lamp lights up (mode lamp goes
off), and the buzzer sounds.
IMPORTANT
1. To change the duration of each mode, contact an authorized Hoshizaki
service company.
2. If the display has changed from temperature indication to
circling indication, the dishwasher is waiting for water supply.
In a wash cycle, the unit will automatically extend the wash
cycle and start a rinse cycle after completion of water supply.
In the rinse mode, the unit will wait for the water supply cycle
to complete and start a rinse cycle.
3. In case washing operation is interrupted by power failure or other reasons,
restart the washing operation from the beginning or select the rinse mode to
rinse off any detergent remaining on the dishes.

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7. UNLOADING
1) Slowly open the door.
2) Slide the rack onto the dishtable.
WARNING
1. To prevent the risk of burns, do not touch the hot water [140 to 176°F (60 to
80°C)] inside the wash tank directly.
2. When opening the door, be careful not to burn yourself with dripping hot
water.
3. To prevent possible burns, handle the rack, dishes, and interior parts [around
176°F (80°C)] with care after washing.
IMPORTANT
When carrying a loaded rack, use both hands to keep it level.
8. INSUFFICIENT WASHING RESULTS
If washing results seem insufficient, check for the following possible causes:
* Small items such as chopsticks and spoons or part of the dishes stick out of the rack to
block the spray arms. Remove the projecting items.
* The dishes are packed and stacked in the rack. Reload the dishes. See “5. [b] LOADING
DISHES”.
* The tank filters or pump filter is clogged. Clean them. See “15. DAILY MAINTENANCE”.
* The spray arm nozzles are clogged. Clean them. See “15. DAILY MAINTENANCE”.
* The upper and lower headers (spray arm shafts) are clogged
with small objects such as toothpicks. Clean them.
* The detergent tank is out of detergent. Replace it with a new
tank. See “3. CHECKING DETERGENT TANK AND RINSE
AID TANK”.
* Wash water is not clean. Press the “ON/OFF” button, check that the display goes off, and
pull out the drain pipe to drain the wash water. Reinsert the drain pipe, then press the “ON/
OFF” button to supply fresh wash water.
Header

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* The wash water temperature is too low.
* The dishes are heavily soiled. Preclean before loading the dishes.
* Iron or tannin content in wash water turns the dishes yellowish or faintly black. Soak the
dishes in a plastic bucket containing hot water and commercial bleach.
* White spots left on clear glassware can be caused by different reasons. Consult with an
authorized Hoshizaki service company or the detergent supplier.
* Adjustments of the wash and rinse cycle times, hot water temperature, and detergent
concentration may be required depending on the water quality, dish types and materials,
and soil conditions.
9. SHUTDOWN
CAUTION
If there is a possibility that the ambient
temperature may fall below 32°F (0°
C) and freeze the unit, be sure to drain
the unit. The water supply line could be
damaged and leak water, resulting in
damage to the surrounding property.
To drain out the water heater, close the
water supply line shut-off valve, and
open the drain valve and water supply
valve.
1) Press the “ON/OFF” button on the operation panel. The display and lamps go off.
2) Open the cover in the front panel, then move the power switch (GFCI) to the “OFF”
position.
3) Turn off the water heater.
4) Turn off the gas and water supplies.
IMPORTANT
To operate the water heater, follow its instruction manual.
Water Heater
Gas Supply Line
Shut-off Valve
Water Supply Line
Shut-off Valve Water
Gas
Water Supply Valve
Drain Valve
Dishwasher

13
5) Tilt back the rack rail.
IMPORTANT
The rack rail may fall down if tilted more than 10°. Do not hang anything from it
or hit it hard.
6) Pull out the drain pipe to drain water from the
wash tank.
7) Remove the right tank filter and then the left
tank filter without spilling scraps inside.
WARNING
When pulling out the drain pipe, be careful not to touch the wash water. It may
cause burns or skin irritation. Turn the drain pipe if it is hard to pull out.
10. INTERRUPTION
WARNING
To prevent hot water from splashing and causing burns, do not open the door
while the unit is running. Wait until the buzzer sounds 1 second after the unit
stops.
To interrupt washing operation, press the “ON/OFF” button on the operation panel. The
display and lamps go off, and the unit stops.
To resume operation, press the “ON/OFF” button.

14
11. STANDBY/CLEANING BUTTON
The “STANDBY/CLEANING” button is used to keep wash water hot. It will cool more
quickly if the door is left open.
1) Press the “STANDBY/CLEANING” button on the operation panel. The standby lamp
lights up (“READY” lamp goes off). The unit will not start even when the door is opened
or closed.
2) To resume operation, press the “STANDBY/CLEANING” button on the operation panel.
The “READY” lamp lights up (standby lamp goes off). Now the dishwasher is ready to
wash.
IMPORTANT
The “STANDBY/CLEANING” button function is not available during washing
operation. Press it while the “READY” lamp is on.
12. INTERNAL BOOSTER TANK ENERGY SAVING CONTROL
The internal booster tank water temperature in the standby mode can be set lower to save
energy. For further details, consult with an authorized Hoshizaki service company.
13. LOW WATER TEMPERATURE LOCK FUNCTION
To ensure the NSF specified minimum wash and rinse water temperatures, this unit is
provided with functions to lock the washing operation until wash water reaches 150°F and
to extend the washing operation until rinse water reaches 180°F (factory default: OFF). For
further details, consult with an authorized Hoshizaki service company.
14. ALERT FUNCTION
To keep water in the wash tank clean, this unit is provided with functions to beep and flash
“Ch” (= Change) in the display when wash water should be changed and to continue this
alert until the wash water tank is refilled (factory default: OFF). For further details, consult
with an authorized Hoshizaki service company.

15
Upper Wash Spray Arm
Upper Rinse Spray Arm
Spray Arm Nut
Spray Arm Nut
15. DAILY MAINTENANCE
IMPORTANT
Be sure to clean the dishwasher after closing time every day. It is difficult to
remove heavy soils left overnight. In high temperature conditions, food scraps
will rot and affect sanitary operation.
1) Take out scraps from the removed tank filters, and wash them clean with a scourer.
IMPORTANT
To prevent damage, do not hit the filters on the sink to drop scraps or to drain
the filters.
2) Turn and loosen the upper spray arm nut
in the direction of the arrow. Support the
upper rinse spray arm, and remove it
together with the upper wash spray arm.
3) Turn and loosen the lower spray arm nut in
the direction of the arrow. Lift off the lower
rinse spray arm, and remove the lower
wash spray arm.
4) If the wash spray arm and rinse spray arm
nozzles are clogged, use a wire or brush to
unclog and wash them clean.
5) Clean the wash compartment by lifting off
the separator toward you. Remove any
scraps from inside the wash compartment
and wash tank. Use a scourer to wash off
heavy soils.
Wire
Separator