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Hoshizaki ROX-20TB2-U - page 1
Hoshizaki “A Superior Degree of Reliability” www .hoshizaki.com Model ROX-20TB2-U Water Electrolyzer Hoshizaki America, Inc. Number: X002-858 Issued: 3-9-2012 SE R VICE MAN U AL ...
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Hoshizaki ROX-20TB2-U - page 2
1 IMPOR T ANT 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 warr ...
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Hoshizaki ROX-20TB2-U - page 3
2 IMPOR T ANT 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 furt ...
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Hoshizaki ROX-20TB2-U - page 4
3 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. W ARNING 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 . ...
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Hoshizaki ROX-20TB2-U - page 5
4 • Ensure adequate ventilation. Hydrogen gas or chlorine gas may cause health problems. • Do not mix electrolyzed water with other chemicals. Mixture with acidic or chlorine-based chemicals can cause chlorine gas, resulting in health problems. • Do not use a large volume of sanitizing water only . Generation of a large amount of chlorine gas ...
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Hoshizaki ROX-20TB2-U - page 6
5 I. GENERAL INFORMA TION 1. SAFETY INSTRUCTIONS The following instructions contain important safety precautions and should be strictly observed. W ARNING 1. When there is no need to energize the unit during disassembly or cleaning, be sure to unplug the unit or disconnect the main power supply before servicing the unit to prevent electric shocks. ...
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Hoshizaki ROX-20TB2-U - page 7
6 NOTICE 1. After servicing, be sure to check for water leaks from the water supply and drain lines to prevent wetting the surrounding properties. 2. After servicing, always check for proper operation. CAUTION LABEL LOCA TIONS The following caution labels are attached where special care should be taken. On top panel Inside door ...
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Hoshizaki ROX-20TB2-U - page 8
7 2. PRODUCT INFORMA TION [a] FEA TURES 1) Space saving The compact unit [W1 1" x D16" x H12" (W280 x D400 x H310 mm)] allows for installation under sink. 2) V arious optional parts available Float switch: Detects the tank water level to automatically start/stop operation. Includes the upper and lower sanitizing water tank level floa ...
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Hoshizaki ROX-20TB2-U - page 9
8 [b] MODEL NAME ROX - 20 T B2 - U For USA Development order T able-top or under-sink installation Maximum fl ow rate (x 0.1 L/min) Hoshizaki water electrolyzer ...
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Hoshizaki ROX-20TB2-U - page 10
9 3. DIMENSIONS/SPECIFICA TIONS ...
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Hoshizaki ROX-20TB2-U - page 11
10 Available Ch lorine <ppm > 0 10 20 30 40 50 60 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Tim e < h> 4. PERFORMANCE DA T A The following graph shows the electrode performance curve. The electrode life cycle depends on the free chlorine concentration as well as the raw water quality . T o optimize the electrolyzed water , we r ...
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Hoshizaki ROX-20TB2-U - page 12
11 II. TECHNICAL INFORMA TION 1. PRINCIPLE OF ELECTROL YSIS W ater (H 2 O) we use in our daily life has a mysterious power . Adding a small amount of salt (NaCl) to water (H 2 O) and electrolyzing it with special electrodes will generate "electrolytic oxidizing water (acidic water)" with strong oxidizing effects and "electrolytic red ...
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Hoshizaki ROX-20TB2-U - page 13
12 DC Power Supply Hypochlorous Acid ( HOCl ) Sodium Hydrox ide (NaOH) Cathode ( RED ) Anode (OX) Positive ions draw n to cathode Cl - Negative ions drawn to anode Salt W ater (NaCl) Diaphragm Electrolytic Cell Flow of electrons Cl - H 2 O H 2 O Na Na Na + Na + Na + OH - OH - 2e - 2e - H 2 HOCl Reactions at Anode Chloride ions (Cl - ) and hydroxide ...
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Hoshizaki ROX-20TB2-U - page 14
13 Salt water contains four kinds of ions; sodium ions (Na + ), chlorine ions (Cl - ), hydrogen ions (H +) and hydroxide ions (OH - ). NaCl + H 2 O → Na + + Cl - + H + + OH - (Mix water and salt) Salt water (4 kinds of ions) When two electrodes are inserted into salt water and voltage is applied: Negative ions (Cl - ) are drawn to the anode, and ...
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Hoshizaki ROX-20TB2-U - page 15
14 2. CONSTRUCTION [a] GENERAL (1) Operation Panel [Body] Displays the present state of the electrolyzer . (2) Door Provided behind are the power switch (ground fault interrupter) and the buttons to adjust the operating conditions and various set values. ...
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Hoshizaki ROX-20TB2-U - page 16
15 (3) Coin Lock Locks the door . (4) Cleaning W ater Outlet Dispenses cleaning water (sanitizing water in flushing process). Should be connected with the cleaning water outlet [remote]. (5) Sanitizing W ater Outlet Dispenses sanitizing water (cleaning water in flushing process). Should be connected with the sanitizing water outlet [remote]. (6) W ...
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Hoshizaki ROX-20TB2-U - page 17
16 (21) Cable Electrically connects the remote controller and the electrolyzer body . Be sure to make the connection when using the remote controller . (22) Salt W ater T ank Makes 1.32 gal (5 L) of electrolyte (concentrated salt water) and adds it to water (diluted salt water). (23) Motion Sensor Non-contact sensor to start and stop dispensing ele ...
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Hoshizaki ROX-20TB2-U - page 18
17 (29) Microswitch [Location] Senses the location of the fl ow switching valve. (30) Microswitch [Direction] Senses the direction of the fl ow switching valve. (31) Flow Control V alve Located between the water supply inlet and the electrolytic cell. Adjusts the rate of water supply . (32) Electrolytic Cell Electrolyzes diluted salt water to gen ...
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Hoshizaki ROX-20TB2-U - page 19
18 (35) Relay (X1) Located on the supply line of the switching regulator [electrolytic cell]. T urns on/off the switching regulator by using a make contact. (36) CB Relay Changes the polarity of the voltage on the electrolytic cell. (37) Current Sensor Measures the current of the electrolytic cell. (38) Noise Absorber Noise absorbing board provided ...
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Hoshizaki ROX-20TB2-U - page 20
19 3. WIRING DIAGRAM ...
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Hoshizaki ROX-20TB2-U - page 21
20 4. W A TER CIRCUIT Pressure Gauge Filter W ater Supply Pressure Reducing V alve (Accessory) W ater Electrolyzer (ROX-20TB2-U) Pressure Reducing V alve (35 psi) W ater Softener Control Box W ater V alve Flow Control V alve Salt W ater Pump Salt W ater Electrolytic Cell Remote Controller or T ank Thermistor Flow Switching V alve ...
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Hoshizaki ROX-20TB2-U - page 22
21 5. FUNCTIONS AND OPERA TION [a] NORMAL MODE The following menus are available in the normal mode. The display shows from 1 to 3 every time the display select button is pressed. No. Menu Description 1 Cell run time (h) T otal electrolytic cell run time at present. 2 Current (A) Current fl owing in electrolytic cell at present as measured by curr ...
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Hoshizaki ROX-20TB2-U - page 23
22 No. Menu Factory default Adjustable range/increments A10 Cell replacement time (h) 3000 1500 to 9000/100 A1 1 Cell reversal time (h) 12 0.033 (check), 1 to 150/1 A12 Continuous dispensing protection time (min) Cont Cont, 10 to 720/10 A13 Single nozzle 2 Single: 1, Std: 2 A14 W ater temperature correction factor 4 0 to 8/1 A15 Flow rate adjustmen ...
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Hoshizaki ROX-20TB2-U - page 24
23 No. Menu C10 Elapsed time after regeneration output (h) C1 1 Last error number C12 Cell run time at last error C13 Cell reversal time at last error C14 Current at last error C15 V oltage at last error C16 T otal fl ow rate at last error C17 Salt water pump stroke at last error (spm: strokes per minute) C18 W ater temperature at last error (°C) ...
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Hoshizaki ROX-20TB2-U - page 25
24 Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF C1 Display Model inputs F l o w c o n t r o l v a l v e m e c h a n i s m 1: ON when ROX-10WB-U is used 2: ON when ROX-20TB2-U is used 3: ON when ROX-20TB2-U with tank is used ٕ ...
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Hoshizaki ROX-20TB2-U - page 26
25 C2 Display (ROX-20TB2-U) Remote panel Hand or pool Beam sensor detection ON when tank is used Beam sensor input: real-time display of sensor rea ction (with/without remote controller short circuit connecto r) Beam sensor lower sensitivity: display according to operation (0.5 second delay after detection) Ext. left beam sensor input ON: detected ...
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Hoshizaki ROX-20TB2-U - page 27
26 C3 Display Flow control valve outputs Brake Close Open Stop Flow control valve 1 b2 ON ON OFF OFF Flow control valve 2 C2 ON OFF ON OFF Brake: valve stopping, Close: decreasi ng flow rate, Open: increasing flow rate, Stop: valve OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused Always OFF Unused ...
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Hoshizaki ROX-20TB2-U - page 28
27 III. SER VICE INFORMA TION 1. ERROR CODES Lamp No. Error Problem Operation Control panel display Error E1 1 Low water Flow rate stayed below 0.13 gal/min (0.5 L/min) for 10 sec with water valve on Production stops after water valve turns off two times Error no. Error E14 W ater shutoff Flow rate stayed above 0.13 gal/min (0.5 L/min) for 10 sec w ...
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Hoshizaki ROX-20TB2-U - page 29
28 Lamp Error code Problem Check Possible cause Remedy Add salt water — (Continued) Salt water pump Defective Repair or replace Improper stroke dial setting Set to "E" (far to left) Supply line open circuit Correct Signal line open circuit Correct Error E1 1 Flow control valve ( fl ow rate sensor) detected fl ow rate below 0.13 gal/ m ...
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Hoshizaki ROX-20TB2-U - page 30
29 3. FLOW RA TE ADJUSTMENT Pressing fl ow rate select button will not change fl ow rate and display Dispensing action is stopped Stop dispensing and press fl ow rate select button Normal (Nor .) mode is selected Select normal (Nor .) mode and press fl ow rate select button Flow control valve connector is disconnected No No Ye s Reconnect 1. Fl ...
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Hoshizaki ROX-20TB2-U - page 31
30 4. REMOV AL AND REPLACEMENT OF COMPONENTS [a] ELECTROL YTIC CELL WARNING T o prevent electric shock, be careful not to crush or drag the pipes or wires when removing the electrolytic cell. NOTICE T o prevent water leaks resulting in wetting the surrounding properties, be sure to drain water before removing the electrolytic cell. 1) Remove the fr ...
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