Hoshizaki JWE-620UA-6B Service Manual
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Hoshizaki JWE-620UA-6B, 32 b) Internal Booster Tank Auto Fill Error (A2) • In the auto fi ll cycle, if the internal booster tank water level fl oat switch does not close within 10 minutes after the cycle starts, the unit shuts down, "A2" appears in the display, and the buzzer sounds. • To reset, use the "ON/OFF" button to turn the unit off and then back on. • See the chart below for possible causes and remedies. Booster Not ready for operation. Get it ready. Strainer Filter clogged. Clean. F
Hoshizaki JWE-620UA-6B, 48 D. Float Switch Check and Cleaning If an abnormal input signal is found by “III.A. Diagnostic Procedure” or the error code “o1” or “o2” is displayed, check and clean/replace the fl oat switch according to the procedure below. 1. Float Switch Check To check the fl oat switch, follow the steps below. 1) Remove the internal booster tank according to “IV.C. Removal and Replacement of Internal Booster Tank.” 2) Remove the control box cover, and disconnect the CN8 connector from the control board (see “II.D.2. Contro
72 VII. Technical Information A. Water Circuit • The wash water is sprayed by the wash pump from the upper and lower wash spray arms into the wash compartment. • The rinse water is sprayed by the rinse pump from the upper and lower rinse spray arms into the wash compartment. • The detergent is fed by the detergent feeder (not provided by Hoshizaki) through the detergent outlet (n
Hoshizaki JWE-620UA-6B, 18 4. Operation Panel Layout The operation panel is mounted on the side of the unit and is connected to the CN5 connector on the control board. 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 “17” and “21” to “25” (Auxiliary Code U-1, U-2, U-3, V-0, A-0) or "01" to "23" and "26" to "30" (Auxiliary Code A-1 and later)] allows for viewing and setting of system operating details and parameters. See "II.D.7. Service Menu and Error Log." c) Error Codes Error co
Hoshizaki JWE-620UA-6B, 1 I. Specifi cations A. Specifi cation 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 DO
Hoshizaki JWE-620UA-6B, 42 2. Dishes Not Clean Low Wash Pump Output Clogged with foreign matter. Clean. Voltage drop. Remove cause. Vapor lock due to clogged tank filter. Clean tank filter. Clogged. Dishes not clean Problem Possible Cause Remedy Wash pump defective. Replace. Out of position (not rotating evenly). Obstructed by cutlery or other item. Reposition the cutlery or other item. Wash Spray Arms Clean. Low pump output. Set in position. See “Low Wash Pump Output”. Continue Vapor lock due to use of neutral cleaner. Stop using neutral cleaner. Dish Ra
Hoshizaki JWE-620UA-6B, 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 B. Nameplate Rating ---------------------------------------------------
26 III. Service Diagnosis WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fi re. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices. 3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear. 4. Do not
Hoshizaki JWE-620UA-6B, 25 3) Set service menu item 22 to either OFF [“Ch” goes off after 10 minutes] or ON [“Ch” keeps fl ashing] (factory default: OFF). Even if set to ON, “Ch” goes off when the “ON/OFF” button on the operation panel is switched off. 4) Set service menu item 23 to ON to stop the beep when the “ON/OFF” button is switched off but to resume fl ashing “Ch” when the “ON/OFF” button is switched back on unless the wash tank is refi lled (factory default: OFF). Press the power switch (GFCI) or turn off the external power supply to stop both the beep and “Ch” indication. Set service menu item 2
Hoshizaki JWE-620UA-6B, 20 b) Service Menu Chart (Auxiliary Code U-1, U-2, U-3, V-0, A-0) Service Menu Item and Details Setting Range Display Factory Default 01 Wash Cycle Time (Standard Mode) 1 to 99 seconds (see no. 08 for multiplier) 1 to 99 41 (41 seconds) 02 Wash Cycle Time (Long Mode) 10 to 990 seconds (see no. 09 for multiplier) 1 to 99 11 (11 seconds) 03 Rinse Cycle Time 5 to 60 seconds 5 to 60 6 04 Wash Temperature Setpoint 32 to 167 °F (0 to 75 °C) 32 to 167 (0 to 75) 163 (73) 05 Rinse Temperature Setpoint 32 to 185 °F (0 to 85 °C) 32 to 185 (0 to 85) 185 (85) 07 Auto Fill Cycle Rinse pump energized 5 to 30 times 5 to 30 28 08 Wash Cycle Time Multiplier (Standard Mode) 1x or 10x 1 or 10 1 09 Wa
Hoshizaki JWE-620UA-6B, 67 5) Close the door. “SC” and the “AUTO FILL” lamp start fl ashing, and the self-cleaning cycle begins. The buzzer sounds and the operation panel turns off when the cycle ends. Move the power switch (GFCI) to the “OFF” position. Turn off the water heater, and the gas and water supplies. 6) Open the door, and remove the upper and lower rinse spray arms. Go on to step 8) of “V.A. Daily Maintenance.” C. Weekly Maintenance 1. Heater WARNING To prevent burns, wait for 10 minutes after draining the unit to clean the interior. Remove any scraps from the heater, and use a soft brush to wash off residue. 2. Exterior 1) Wipe the exterior
15 2. Control Board Layout Inputs and outputs are laid out on the control board as illustrated below. Buzzer Output XA Connector (2P) Signal Input XA Connector (6P) Power Input VH Connector (6P) Output VH Connector (7P) Output VH Connector (5P) X1 X2 X3 X4 X5 X6 X7 CN8 CN9 CN10 CN1 CN7 CN6 CN5 CN11 CN13 CN
Hoshizaki JWE-620UA-6B, 66 11) Place the lower wash spray arm on the lower spray arm shaft, and tighten the lower spray arm nut in the direction of the arrow. 12) Check that the wash spray arms and rinse spray arms can be turned easily by hand. 13) Insert the drain pipe securely. 14) Lower the rack rail. With the rack rail lifted up, the door cannot be closed and the unit will not operate. B. Self-Cleaning The self-cleaning function is to rinse the wash compartment with hot water. Use this function after step 7) of “V.A. Daily Maintenance.” NOTICE If a portion control detergent feeder other than concentration sens
Hoshizaki JWE-620UA-6B, 47 7. Wash Tank Water Not Draining Drain Hose Clogged. Unclog. Wash tank water not draining Problem Possible Cause Remedy Pinched. Correct. Clogged. Unclog. Drain Pipe (Overflow Pipe) Raised. Correct.
Hoshizaki JWE-620UA-6B, 45 4. Dishwasher Will Not Start When Door Closed Setting error Unit in “STANDBY.” Press “STANDBY/ CLEANING” button to cancel “STANDBY.” Dishwater will not start when door closed Problem Possible Cause Remedy Wash/Rinse cycle start initiation (service menu item 11) set to “STANDBY/ CLEANING” button. Change to door switch start. Wash Pump Inoperative Protector tripped. Wait until wash pump cools. Locked with foreign matter. Remove obstacles. Controller input/output error. Check input/output and
Hoshizaki JWE-620UA-6B, 12 C. Sequence of Operation Flow Chart a) Auxiliary Code U-1, U-2, U-3, V-0, A-0 Dishwasher Sequence Flow Chart JWE-620UA-6B 1. Auto Fill Cycle • DS must be closed for cycle to start. • RPM time: (service menu item 03). • RPM energized/de-energized count: (service menu item 07). • BTH and WTH are de-energized during Auto Fill Cycle. Cycle Steps 2. Ready Cycle (Unit Inactive) WV energized/de-energized by BT WLF/S RPM energized (time=service menu item 03)/de-energized (10 sec.) (power supplied/cut to RFT as RPM energized/de-energized) WT WLS check. Go to Ready Cycle if closed. Initial startup begins he
Hoshizaki JWE-620UA-6B, 69 F. Shutdown NOTICE 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 suppl
Hoshizaki JWE-620UA-6B, 31 Sticking (with float in “ON” position). Check and clean. See “III.D. Float Switch Check and Cleaning.” Defective (with internal contacts in “ON” position). Replace. Internal Booster Tank Water Level Float Switch Continue
Hoshizaki JWE-620UA-6B, 8 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 time set by the rinse cycle time setting. For details, see “Rinse Cyc
68 Recommendation of safety inspection by service personnel Even if there is no problem with its use, a product out of warranty may have a risk of electric shock, fi re, or water leak due to insulation degradation or aging of the electrical parts. Ask an authorized Hoshizaki service company for the following inspections (charged): • Dust and dirt build-up or water leak inside the unit •
Hoshizaki JWE-620UA-6B, 22 21 Total Operation Cycles Before Alert 10 to 990 cycles 1 to 99 2 (20 cycles) 22 Display Hold Function ON: stays on OFF: goes off after 10 minutes on or oF oF 23 Power Supply Lock Function ON: "Ch" keeps fl ashing until electrode is turned off OFF: "Ch" goes off when "ON/ OFF" button is switched off on or oF oF 24 N/A 25 N/A 26 through 30 Error Log Note: To erase the log, press and hold the up and down buttons for 3 seconds with one of the error codes displayed. The unit beeps o
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