Hoshizaki JWE-620UA-6B User manual

SERVICE MANUAL
HOSHIZAKI
DISHWASHER
JWE-620UA-6B
NO. 80VC-782
ISSUED: OCT. 20, 2009
REVISED: SEP. 6, 2011
MODEL

IMPORTANT
Only qualified 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 qualified 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: [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.

IMPORTANT
This manual should be read carefully before the unit is serviced or maintenance
operations are performed. Only qualified 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. Specifications ------------------------------------------------------------------------------------------------ 1
A. Specification Sheet ------------------------------------------------------------------------------------- 1
B. Nameplate Rating--------------------------------------------------------------------------------------- 2
C. Dimensions/Connections------------------------------------------------------------------------------ 3
II. General Information---------------------------------------------------------------------------------------- 4
A. Construction---------------------------------------------------------------------------------------------- 4
1. Dishwasher-------------------------------------------------------------------------------------------- 4
2. Internal Booster Tank ------------------------------------------------------------------------------- 5
3. Control Box-------------------------------------------------------------------------------------------- 6
B. Sequence of Operation-------------------------------------------------------------------------------- 8
1. Auto Fill Cycle----------------------------------------------------------------------------------------- 8
2. Ready Cycle (Unit Inactive) ----------------------------------------------------------------------- 9
3. Wash Cycle-------------------------------------------------------------------------------------------- 9
4. Rinse Cycle-------------------------------------------------------------------------------------------10
5. Drain----------------------------------------------------------------------------------------------------11
C. Sequence of Operation Flow Chart----------------------------------------------------------------12
D. Control Board and Operation Board---------------------------------------------------------------14
1. Control Board Location----------------------------------------------------------------------------14
2. Control Board Layout ------------------------------------------------------------------------------15
3. Control Board Diagram----------------------------------------------------------------------------16
4. Operation Panel Layout---------------------------------------------------------------------------18
5. Features-----------------------------------------------------------------------------------------------18
6. Controls, Adjustments, and Lamps-------------------------------------------------------------18
7. Service Menu and Error Log---------------------------------------------------------------------19
8. Temperature Display -------------------------------------------------------------------------------22
9. Error Codes ------------------------------------------------------------------------------------------23
10. Buzzer -------------------------------------------------------------------------------------------------23
11. Special Modes ---------------------------------------------------------------------------------------23
III. Service Diagnosis ----------------------------------------------------------------------------------------26
A. Diagnostic Procedure ---------------------------------------------------------------------------------26
B. Error Codes----------------------------------------------------------------------------------------------28
1. Error Code Table------------------------------------------------------------------------------------28
2. Error Code Log--------------------------------------------------------------------------------------29
3. Error Code Details----------------------------------------------------------------------------------30
C. Service Flow Charts-----------------------------------------------------------------------------------40
1. Unit Will Not Start-----------------------------------------------------------------------------------40
2. Dishes Not Clean -----------------------------------------------------------------------------------42
i

3. Inadequate Rinse-----------------------------------------------------------------------------------44
4. Dishwasher Will Not Start When Door Closed ----------------------------------------------45
5. No or Inadequate Detergent/Rinse Aid Supply----------------------------------------------46
6. Wash Tank Water Boils----------------------------------------------------------------------------46
7. Wash Tank Water Not Draining------------------------------------------------------------------47
D. Float Switch Check and Cleaning------------------------------------------------------------------48
1. Float Switch Check---------------------------------------------------------------------------------48
2. Float Switch Cleaning------------------------------------------------------------------------------48
E. Thermistor Check --------------------------------------------------------------------------------------49
IV. Removal and Replacement of Components-------------------------------------------------------50
A. Removal of Panels-------------------------------------------------------------------------------------50
B. Accessing the Control Box---------------------------------------------------------------------------50
C. Removal and Replacement of Internal Booster Tank-----------------------------------------52
D. Removal and Replacement of Wash Pump Motor---------------------------------------------53
E. Removal and Replacement of Rinse Pump Motor---------------------------------------------54
F. Removal and Replacement of Handle-------------------------------------------------------------55
G. Removal and Replacement of Door---------------------------------------------------------------56
H. Removal and Replacement of Spring Unit-------------------------------------------------------57
I. Removal and Replacement of Spring -------------------------------------------------------------57
J. Adjustment of Door Opening/Closing Force -----------------------------------------------------58
K. Removal and Replacement of Flush Pipe -------------------------------------------------------59
L. U-Packing Installation Instructions-----------------------------------------------------------------60
M. Removal and Replacement of Thermistor-------------------------------------------------------61
N. Removal and Replacement of Control Board or Operation Board-------------------------62
1. Control Board----------------------------------------------------------------------------------------62
2. Operation Board-------------------------------------------------------------------------------------62
V. Cleaning and Maintenance Instructions -------------------------------------------------------------64
A. Daily Maintenance -------------------------------------------------------------------------------------64
B. Self-Cleaning--------------------------------------------------------------------------------------------66
C. Weekly Maintenance----------------------------------------------------------------------------------67
1. Heater--------------------------------------------------------------------------------------------------67
2. Exterior ------------------------------------------------------------------------------------------------67
3. Wash Compartment--------------------------------------------------------------------------------67
D. Monthly Maintenance ---------------------------------------------------------------------------------67
1. Power Switch (Ground Fault Circuit Interrupter)--------------------------------------------67
2. Water Supply Line ----------------------------------------------------------------------------------67
E. Descaling (As Required) -----------------------------------------------------------------------------68
F. Shutdown -------------------------------------------------------------------------------------------------69
G. Long Storage, Relocation, Disposal, Transfer--------------------------------------------------70
VI. Operating Instructions-----------------------------------------------------------------------------------71
VII. Technical Information-----------------------------------------------------------------------------------72
A. Water Circuit---------------------------------------------------------------------------------------------72
B. Wiring Diagram -----------------------------------------------------------------------------------------73
1. Auxiliary Code U-1, U-2, U-3, V-0, A-0 --------------------------------------------------------73
2. Auxiliary CodeA-1 and Later---------------------------------------------------------------------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 Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the unit or
property.
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:
• 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, fire, or severe damage to
equipment.
• This unit requires an independent power supply. See the nameplate for
proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse
can result in a tripped breaker, blown fuse, 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.
• Move the power switch (GFCI) to the “OFF” position, then turn off the power
supply before servicing. Lockout/Tagout to prevent the power supply from
being turned back on inadvertently.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, fire, 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.
iii

1
I. Specifications
A. Specification Sheet
WASH TANK SIDE BOOSTER TANK SIDE
3 phase 3-wire 208-230V/60Hz (±10%)
15.8kVA(39.7A)
Max Running 36.6A, Rated Motor 4.2A
26.0A
Rated Motor 1.40kW (Power Factor 85%)
Max 14.30kW
AC SUPPLY VOLTAGE
POWER SUPPLY CAPACITY
AMPERAGE
STARTING AMPERAGE
ELECTRICAL CONSUMPTION
HEATER 6.9kW 6.0kW
RACK SIZE
NUMBER OF LARGE DISHES / RACK
CYCLE TIME
WATER CONSUMPTION
19-3/4" × 19-3/4"(500 × 500mm)
16 plates (9.1” DIA)
53 sec (wash 41 sec, dwell 5 sec, rinse 6 sec, dwell 1 sec)
0.53Gal/cycle(2.0L/cycle)
OUTSIDE DIMENSIONS
EXTERIOR
DOOR
W25.2" × D25.8" × H60.5" (W640 × D655 × H1,537mm)
Stainless Steel
Vertical Sliding Door (opening height 18.0") (457mm)
Upper and Lower Triple Spray Arms (common arms on top and bottom)
Upper and Lower Wide Angle Spray Arms
Wash 1HP, Rinse 0.134HP
Draw Out Overflow Pipe, Overflow Drain
Door Switch (start switch mode also available)
Residual Heat Drying
Filter Collection
Not Provided
Ready, Auto Fill, Rinse, Wash-Standard, Wash-Long, Pause
Wash Water Temperature, Rinse Water Temperature, Error
14.3Gal (54L)
Automatic Hot Water Supply by
Microprocessor Control
Wash: 150ºF(66ºC) min.
Thermistor Control: 163ºF(73ºF) -
168(76ºF)
1.9Gal (7.3L)
Automatic Hot Water Supply by
Water Valve
Rinse: 180ºF(82ºC) min.
Thermistor Control: 182ºF(83ºC)-185ºF (85ºC)
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 Inlet: 3/4"FPT
Outlet: 1-1/2"MPT
WASH TIME Standard: 1 - 99 sec, in 1 sec steps
Long: 10 - 990 sec, in 10 sec steps Microprocessor control
CONTROL RINSE TIME
END BUZZER VOLUME
5 - 12 sec, Adjustable, in 1 sec steps
0 - Max, Adjustable
Ground Fault Circuit Interrupter (with Overcurrent Protector)
Water Level Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
Float Switch,
Bimetal Thermostat (Manual - Reset),
Thermistor (Auto - Reset)
ELECTRIC CIRCUIT PROTECTION
BOIL – DRY PROTECTION
SAFETY SYSTEM Door Switch, Emergency Stop by Microprocessor Control
WEIGHT Net 247lb (112kg) / Gross 344lb (156kg)
PACKAGE Carton + Crate
W32.1"×D34.6"×H68.0" (815mm × 880mm × 1,726mm)
CERTIFICATION NSF ANSI-3, ETL, Energy Star
ACCESSORIES
Universal rack (19-3/4" x 19-3/4") x 1, Instruction manual x 1
Installation manual x 1, Maintenance sheet (English and Spanish)x 1
Inlet water strainer & Packing x 1,
OPERATION CONDITIONS
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)
* 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.

2
B. Nameplate Rating
For certification marks, see the nameplate on the dishwasher.
We reserve the right to make changes in specifications and design without prior notice.

3
C. Dimensions/Connections
Units: mm [in.]

4
II. General Information
A. Construction
1. Dishwasher

5
2. Internal Booster Tank
Legend: F/S–float switch; H–heater; TH–thermistor