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NO. 80VC-782
ISSUED: OCT. 20, 2009
REVISED: MAR. 28, 2011
HOSHIZAKI
DISHWASHER
MODEL
JWE-620UA-6B
SERVICE MANUAL
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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
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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 ---------------------------------------------------------------------------------------
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3. Inadequate Rinse -----------------------------------------------------------------------------------43 4. Dishwasher Will Not Start When Door Closed ----------------------------------------------44 5. No or Inadequate Detergent/Rinse Aid Supply ----------------------------------------------45 6. Wash Tank Water Boils ----------------------------------------------------------------------------45 7. Wash Tank Water Not Draining ------------------------------------------------------------------4
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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 expressl
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I. Specifi cations A. Specifi cation Sheet WASH TANK SIDE BOOSTER TANK SIDE AC SUPPLY VOLTAGE 3 phase 3-wire 208-230V/60Hz (±10%) POWER SUPPLY CAPACITY 15.8kVA(39.7A) AMPERAGE Max Running 36.6A, Rated Motor 4.2A STARTING AMPERAGE 26.0A ELECTRICAL CONSUMPTION Rated Motor 1.40kW (Power Factor 85%) Max 14.30kW HEATER 6.9kW 6.0kW RACK SIZE 19-3/4" × 19-3/4"(500 × 500mm) NUMBER OF LARGE DISHES / RACK 16 plates (9.1” DIA) CYCLE TIME 53 sec (wash 41 sec, dwell 5 sec, rinse 6 sec, dwell 1 sec) W
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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. 2
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C. Dimensions/Connections 3 Units: mm [in.]
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II. General Information A. Construction 1. Dishwasher 4
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2. Internal Booster Tank Legend: F/S–fl oat switch; H–heater; TH–thermistor 5
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3. Control Box a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 Top View Fan Air Flow Motor Fan motor is attached to the base Ground Fault Circuit Interrupter Wash Tank Heater Control Rinse PM Control Side View Wash PM Control Internal Booster Tank Heater Control Legend: CB–control board; GFCI–ground fault circuit interrupter; MC–magnetic contactor; PM–pump motor; RX–phase reversal relay; TR–transformer; X–relay 6
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b) Auxiliary Code A-1 and Later Legend: CB–control board; GFCI–ground fault circuit interrupter; MC–magnetic contactor; PM–pump motor; RX–phase reversal relay; TR–transformer; X–relay 7
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B. Sequence of Operation The steps in the sequence are as outlined below. 1. Auto Fill Cycle a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 “AUTO FILL” lamp fl ashing and “RINSE,” “STANDARD,” or “LONG” lamp on. If WT WLS is open when power is supplied and the “ON/OFF” button is pressed, the “AUTO FILL” lamp fl ashes and the auto fi ll cycle starts. WV energizes. When BT WLF/S closes, WV de-energizes, RPM energizes and power is supplied to RFT. RPM energizes and power is supplied to RFT for length of t
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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)." Note: 1. If DS opens during the auto fi ll cycle, the "AUTO FILL" lamp goes off, and RPM de- energizes. When DS closes again, the "AUTO FILL" lamp starts fl ashing and the unit resumes cycling RPM for the remaining number of times determined by the auto fill cycle setting. 2. BTH is de-energized during the auto fill cycle. WTH is energi
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"STANDBY/CLEANING" Button Start When the "READY" lamp is on, the unit starts operation in the selected mode when the "STANDBY/CLEANING" button is pressed. "STANDARD" or "LONG" lamp fl ashing (depending on the wash mode selected). WPM energizes and power is supplied to DFT for the length of time set by the wash cycle time setting. For details, see "Wash Cycle Time (Standard Mode) or "Wash Cycle Time (Long Mode)" (service menu item 01 or 02) in "II.D.7.b) Service Menu Chart." WPM draws water from
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"RINSE" lamp fl ashing. RPM energizes and power is supplied to RFT for length of time set by the rinse cycle time setting. For details, see "Rinse Cycle Time" (service menu item 03) in "II.D.7.b) Service Menu Chart." 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 overflow pipe. After RPM de- energizes, the unit enters a 1-sec
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C. Sequence of Operation Flow Chart a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 12 Dishwasher Sequence Flow Chart JWE-620UA-6B Cycle Steps 1. Auto Fill Cycle 2. Ready Cycle (Unit Inactive) 3. Wash Cycle 4. Rinse Cycle • DS must be closed for cycle to Cycle started by door switch or Starts after wash cycle. If mode is start. "STANDBY/CLEANING" button set to "RINSE," can also be started • RPM time: (service menu item 03). (service menu item 11). by door switch or "STANDBY/ • RPM energized/de-energ
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b) Auxiliary Code A-1 and Later 13 Dishwasher Sequence Flow Chart JWE-620UA-6B Cycle Steps 1. Auto Fill Cycle 2. Ready Cycle (Unit Inactive) 3. Wash Cycle 4. Rinse Cycle • DS must be closed for cycle to Cycle started by door switch or Starts after wash cycle. If mode is start. "STANDBY/CLEANING" button set to "RINSE," can also be started • RPM time: (service menu item 03). (service menu item 11). by door switch or "STANDBY/ • RPM energized/de-energized CLEANING" button (service menu count: (s
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D. 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. CAUTION 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 repla
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2. Control Board Layout Inputs and outputs are laid out on the control board as illustrated below. Signal Input XA Connector (6P) Buzzer Output XA Connector (2P) Signal Input XA Connector (10P) Power Input VH Connector (4P) Thermistor Signal Input XA Connector (4P) CN2 1 1 2 1 10 6 1 1 4 Power Input VH Connector (6P) CN8 CN9 CN10 4 CN1 High 6 1 CN7 X1 VR1 Low 1 X2 Buzzer Volume 8 Output VH Connector (7P) X3 CN6 X4 7 1 X5 CN3 5 CN5 X6 CN11 1 O
