Hoshizaki ROX-20TA-U User Manual
NO. U8AA-554
ISSUED: DEC. 29, 2000
REVISED:
HOSHIZAKIHOSHIZAKI
HOSHIZAKI
HOSHIZAKIHOSHIZAKI
WATER ELECTROLYZERWATER ELECTROLYZER
WATER ELECTROLYZER
WATER ELECTROLYZERWATER ELECTROLYZER
MODEL
ROX-20TA-UROX-20TA-U
ROX-20TA-U
ROX-20TA-UROX-20TA-U
SERVICE MANUAL
CONTENTS PAGE
I. GENERAL INFORMA TION -------------------------------------------------------------------------- 1
1. SAFETY INSTRUCTIONS------------------------------------------------------------------------ 1
2. PRODUCT INFORMA TION ---------------------------------------------------------------------- 3
[a] FEATURES ------------------------------------------------------------------------------------- 3
[b] MODEL NAME--------------------------------------------------------------------------------- 3
3. DIMENSIONS/CONNECTIONS----------------------------------------------------------------- 4
4. FEATURES OF STRONG ACID W ATER----------------------------------------------------- 5
5. PRINCIPLE OF STRONG ACID WA TER GENERATION --------------------------------- 6
II. CONSTRUCTION ------------------------------------------------------------------------------------- 7
1. GENERAL ------------------------------------------------------------------------------------------- 7
2. CONTROL P ANEL -------------------------------------------------------------------------------- 9
3. DISPLAY PANEL----------------------------------------------------------------------------------10
4. CONTROL BOX----------------------------------------------------------------------------------- 11
5. REMOTE CONTROLLER (OPTION) ---------------------------------------------------------12
6. WATER TANK FLOAT SWITCHES (OPTION)----------------------------------------------12
7. OUTLET V ALVES (OPTION) -------------------------------------------------------------------12
III. OPERATING INSTRUCTIONS --------------------------------------------------------------------13
1. FUNCTIONS AND ADJUSTMENT OF SET ITEMS---------------------------------------13
2. FUNCTIONS AND ADJUSTMENT OF CHECK ITEMS----------------------------------21
3. OPERA TION FLOW CHAR T -------------------------------------------------------------------24
IV . TECHNICAL INFORMA TION ---------------------------------------------------------------------25
1. WA TER CIRCUIT----------------------------------------------------------------------------------25
2. WIRING DIAGRAM -------------------------------------------------------------------------------26
3. PERFORMANCE DATA-------------------------------------------------------------------------27
V . SERVICE INFORMA TION -------------------------------------------------------------------------29
1. MAINTENANCE/INSPECTION ----------------------------------------------------------------29
2. SERVICE DIAGNOSIS --------------------------------------------------------------------------31
U8AA5540012
I. GENERAL INFORMATION
1. SAFETY INSTRUCTIONS
The following instructions contain important safety precautions and should be strictly observed.
The terms used here are defined as follows:
WARNING: There is a possibility of death or serious injury for the service person and a third
party or the user due to improper service operations or defects in serviced
products.
CAUTION: There is possibility of injury of the service person and a third party or the user or
damage to their property* due to improper service operations or defects in
serviced products.
* The term “damage to their property” here refers to extensive damage to houses, household
effects, livestock and pets.
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.
2. If the unit must be energized for inspection of the electric circuit, use rubber gloves to avoid
contact with any live parts, which may result in electric shocks.
3. Check for proper earth connections, and repair if necessary to prevent electric shocks.
4. Always use service parts intended for the applicable model for replacement of defective
parts. Use proper tools to secure the wiring. Otherwise abnormal operation or trouble
may occur and cause electric leaks or fire.
5. Check for proper part installations, wiring conditions and soldered or solderless terminal
connections to avoid smoke, fire or electric shocks.
6. Be sure to replace damaged or deteriorated power cords and lead wires to prevent electric
shocks, flames or smoke.
7. Lead wires using solderless terminals or the like must be bound with their closed ends up
to avoid entrance of moisture that could lead to electric leaks or fire.
8. After servicing, always use a megohmmeter (DC500V) to check for the insulation resistance
of minimum 1 megohm between the live part (attachment plug) and the dead metal part
(earth terminal). Negligence in checking may cause electric leaks or shocks.
U8AA5540012
9. Do not service the electrical parts with wet hands to prevent electric leaks or shocks.
1
10. Always ask the user to keep children away from the work area. They may be injured by
tools or disassembled products.
CAUTION
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 LOCATION
The following caution labels are attached where special care should be taken.
On top panel
Inside door
On remote controller (option)
On bottom front of control box
2
U8AA5540012
2. PRODUCT INFORMATION
[a] FEATURES
1) Space saving
The compact unit (W280 x D400 x H310 mm) allows for installation under sink.
2) Various optional parts available
Remote Controller: Makes the dispensing section remotely operable at hand.
Float Switch: Detects the tank water level to automatically start/stop operation.
Outlet Valve: Allows use of electrolyzed water stored in the tank, as required.
3) Concentrated salt water direct injection system
Direct addition of concentrated salt water held in the Salt Water Tank (accessory) into
the water flow requires no tank for diluted salt water, resulting in reducing the space
required.
4) Built-in current sensor
No salt concentration sensor is required. The built-in current sensor provides highly
accurate control.
5) Constant-voltage DC power supply
Current control by a constant-voltage power supply uses the salt concentration to correct
reduction of the electrolyzation efficiency , resulting in stable concentration of available
chlorine.
6) Available chlorine concentration 20 - 30 mg/L or more
Acid water contains undissociated hypochlorous acid (HOCl) which sanitizes faster
than sodium hypochlorite (NaOCl) and does not remain.
[b] MODEL NAME
ROX - 20 T A - U
For USA
Development Order
T able-top or under-sink installation
Maximum flow rate (x0.1L/min)
Hoshizaki Water Electrolyzer
U8AA5540012
3
3. DIMENSIONS/CONNECTIONS
Unit: inch (mm)
4
U8AA5540012
4. FEATURES OF STRONG ACID WATER
Electrolyzed water (electrolyzed functional water) is a solution with useful functions caused by
electrolyzation of thin salt water or tap water. Dif ferent conditions of electrolyzation produce
various kinds of electrolyzed water whose applications are categorized into: [1] sanitation
(strong acid water, strong alkaline water, weak acid water, hypochlorous acid water) and [2]
consumption (alkaline ionized water). The Water Electrolyzer ROX-20T A-U produces strong
acid water and strong alkaline water in the category [1].
Strong acid water has the following features:
(1) Main Ingredient: Hypochlorous acid*
1)
(2) pH: 2.2 - 2.7
(3) Oxidation-Reduction Potential*2): Max. +1 100mV
(4) Available Chlorine Concentration*3): 20 - 60mg/L
(5) Color: None
(6) Others: Stimulative smell of chlorine
(contains un-electrolyzed salt)
*1) Hypochlorous acid (HOCl)
Dissolution of chlorine gas in water generates hypochlorous acid (HOCl) whose ratio to
hypochlorous acid ion (ClO-) varies with the pH of water. In the pH range for strong acid
water, much more HOCl than ClO- exists. Both HOCl and ClO- have a bactericidal
effect, but HOCl is much stronger than ClO-.
*2) Oxidation-Reduction Potential (ORP)
Oxidizing (or reducing) effect of the solution. The larger positive number indicates the
higher oxidizing effect.
*3) Available Chlorine Concentration
Chlorine concentration contributing to the bactericidal activity . It indicates the amount
of chlorine corresponding to iodine isolated in the following reaction:
NaOCl + 2Kl + 2CH3•COOH I2 + 2CH3•COOK + NaCl + H2O
U8AA5540012
Note: The terms related to chlorine are defined as below:
Residual Chlorine: Remaining chlorine as the result of excessive chlorine addition into
tap water to optimize the bactericidal effect of chlorination.
Free Chlorine: Chlorine (Cl2), hypochlorous acid (HOCl) and hypochlorous acid ion
(OCl-) generated by dissolution of chlorine in water.
Combined Chlorine: Chloramine (NH2Cl, NHCl2, NCl3) generated by dissolution of chlorine
in water containing ammoniate or organic nitride. Combined chlorine
is stable and durable, but not so effective in a quick bactericidal activity .
Available Chlorine: Combination of free chlorine and combined chlorine.
5
5. PRINCIPLE OF STRONG ACID WATER GENERATION
Strong acid water is generated at the anode inside the Electrolytic Cell where the membrane
divides the anode and cathode, by electrolyzation of 0.1% or less salt water . See the figure
below .
At the anode, chlorine ion (Cl-) generates chlorine gas which reacts with H2O to generate
chloride and hypochlorous acid (HOCl). H2O is also electrolyzed at the anode to become
oxygen (O2) and hydrogen ion (H+). Eventually , the anolyte pH falls below 2.7, the oxidationreduction potential (ORP) rises significantly , and the available chlorine concentration reaches
20 - 60 mg/L.
[Reaction Formula]
Anode H2O 1/2O2 + H+ + 2e
2Cl
-
Cl2 + 2e
-
Cl2(aq) + H2O HCl + HOCl
Cathode H2O + 2e
-
1/2H2 + OH
-
-
6
U8AA5540012
II. CONSTRUCTION
1. GENERAL
[4]
[6] [5] [3]
[7] [2]
[8]
[17]
[16] [18]
[19]
[1]
[20]
[21]
[9] [15]
[10]
[11] [14]
[12]
[13]
[1] Display Panel
See “3. DISPLAY PANEL“.
[2] Lamp Board
Board with lamps indicating unit status.
[3] Control Box
See “4. CONTROL BOX”.
[4] Flow Switching V alve
Changes the flow direction of electrolyzed water.
[5] Microswitch [Direction]
Senses the direction of the Flow Switching V alve.
[6] Microswitch [Location]
Senses the location of the Flow Switching V alve.
[7] Gear Motor
Rotates the Impeller inside the Flow Switching V alve.
[8] Water Valve
Supplies potable water to the Electrolytic Cell.
[9] Flow Rate Sensor
Senses potable water flow .
[10] Surge Absorber
Interrupts a temporary voltage surge.
[1 1] Electrolytic Cell
Electrolyzes diluted salt water and generates acid and alkaline water .
[12] Leg
Not adjustable.
[27]
[22]
[26]
[25] [24] [23]
U8AA5540012
7
[13] Door
Provided with Door Lock.
[14] Door Lock
Locks the Door.
[15] Control Panel
See “2. CONTROL P ANEL”.
[16] Acid Water Outlet
Dispenses acid water during the normal operation and alkaline water during the flushing
process.
[17] Alkaline Water Outlet
Dispenses alkaline water during the normal operation and acid water during the flushing
process.
[18] Water Supply Inlet
Inlet for potable water supplied to the unit.
[19] Electromagnetic Metering Pump
Supplies salt water to the unit.
[20] Terminal Block
Used when the Water Tank (sold separately) is installed.
[21] Rear Panel (not shown)
Removed when the Water Tank Float Switches are connected to the Terminal Block or
the Remote Controller is connected to the Control Box.
[22] Blind Bushing
Removed when the Water Tank Float Switches are connected to the Terminal Block or
the Remote Controller is connected to the Control Box.
[23] Power Supply Cord
Flexible cord with a grounding conductor and grounding type attachment plug.
[24] Drain Cap
Used for draining the pipes.
[25] Salt Water Hose
Includes the PVC hose and the Water Level Sensor .
[26] Water Level Sensor
Senses the level of salt water inside the Salt Water Tank.
[27] Salt Water Filter
Removes foreign substances in salt water.
8
U8AA5540012
2. CONTROL PANEL
[1]
[2]
[3]
[4]
[5]
[6]
[10]
[9]
[7] [8]
[1] Display Window
Displays the operation time, amperage or voltage during the normal operation and
error codes in case of trouble.
[2] Operation Time Lamp
Display Window displays operation time (h) when this lamp is on.
[3] Amperage Lamp
Display Window displays amperage (A) when this lamp is on.
[4] Voltage Lamp
Display Window displays voltage (V) when this lamp is on.
[5] Display Select Button
Switches the display of the Display Window .
[6] Flush Button
Functions as a switch to flush the pipes beyond the acid and alkaline water outlets.
[7] Set Button
Only qualified service personnel or installer may press this button to adjust various set
values.
[8] Amperage Control Volume
Only qualified service personnel may turn this control to change the set amperage.
[9] Voltage Control Volume
Only qualified service personnel may turn this control to change the set voltage.
[10] Power Switch
Turns the unit on and off.
U8AA5540012
9
Loading...