Hoshizaki ROX-20TA-U User manual

INSTRUCTION MANUAL
ISSUED: FEB. 29, 2000
REVISED: APR. 25, 2005
HOSHIZAKI
WATER ELECTROLYZER
MODEL ROX-20TA-U

IMPORTANT
Only qualified service technicians should attempt to install, service or maintain
thiswaterelectrolyzer.Noinstallation,serviceormaintenanceshouldbeundertaken
untilthetechnicianhasthoroughlyreadthisInstructionManual.Likewise,theowner/
manager should not proceed to operate the water electrolyzer until the installer
has instructed them on its properoperation.
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
installation, maintenance and service of the water electrolyzer.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.
HOSHIZAKIAMERICA, INC.
618 Highway 74 South
Peachtree City, GA30269
Attn: HOSHIZAKITechnical Support Department
Phone: [phone] Technical Service
[phone]
Fax: [phone]
Note: Toexpediteassistance,allcorrespondence/communicationMUSTincludethefollowing
information:
* Model Number
* Serial Number
* Complete and detailed explanation of the problem

*Pleasereviewthismanual.Itshouldbereadcarefullybeforethewaterelectrolyzerisinstalled
and operated. Only qualified service technicians should install, service and maintain the
waterelectrolyzer.Thismanualshouldbemadeavailabletothetechnicianpriortoinstallation,
maintenanceorservice.
* Keep this manual with the water electrolyzer for later reference.
CONTENTS PAGE
I.SPECIFICATIONS---------------------------------------------------------------------------------------1
1. NAMEPLATE RATING------------------------------------------------------------------------------1
2.DIMENSIONS/CONNECTIONS ------------------------------------------------------------------2
II.CONSTRUCTION ---------------------------------------------------------------------------------------3
1. GENERAL---------------------------------------------------------------------------------------------3
2. CONTROLPANEL ----------------------------------------------------------------------------------5
3. DISPLAY PANEL ------------------------------------------------------------------------------------6
4. CONTROLBOX--------------------------------------------------------------------------------------7
5.REMOTECONTROLLER(OPTION)------------------------------------------------------------8
6. WATER TANK FLOAT SWITCHES (OPTION) ------------------------------------------------8
7. OUTLET VALVES (OPTION) ---------------------------------------------------------------------9
8. ACCESSORIES -------------------------------------------------------------------------------------9
III.INSTALLATIONANDOPERATINGINSTRUCTIONS-----------------------------------------10
1. CHECKS BEFORE INSTALLATION ---------------------------------------------------------- 10
2. HOW TO REMOVE PANELS-------------------------------------------------------------------10
3.LOCATION ------------------------------------------------------------------------------------------10
4. ELECTRICAL CONNECTION ------------------------------------------------------------------ 11
5. INSTALLATION OFWATER SOFTENER (SOLD SEPARATELY)AND
WATER FILTER (SOLD SEPARATELY)-----------------------------------------------------12
[a] CHECKS BEFORE INSTALLATION------------------------------------------------------ 12
[b]LOCATION --------------------------------------------------------------------------------------12
[c] SET UP ------------------------------------------------------------------------------------------12
[d]ELECTRICALCONNECTION --------------------------------------------------------------12
[e] WATER SUPPLYAND PLUMBING CONNECTIONS --------------------------------13
6. INSTALLATION OF REMOTE CONTROLLER (OPTION) -------------------------------- 14
[a] CHECKS BEFORE INSTALLATION------------------------------------------------------ 14
[b]LOCATION --------------------------------------------------------------------------------------14
[c] SET UP ------------------------------------------------------------------------------------------15
[d]ELECTRICALCONNECTION --------------------------------------------------------------17
7. INSTALLATION OF WATERTANK FLOAT SWITCHES (OPTION)AND
WATER TANK (SOLD SEPARATELY) -------------------------------------------------------17
[a] CHECKS BEFORE INSTALLATION------------------------------------------------------ 17
[b]LOCATION --------------------------------------------------------------------------------------18
[c] SET UP ------------------------------------------------------------------------------------------18
i

[d] ELECTRICAL CONNECTION -------------------------------------------------------------- 19
8. INSTALLATION OF OUTLET VALVES (OPTION)------------------------------------------ 20
[a] CHECKS BEFORE INSTALLATION------------------------------------------------------20
[b]LOCATION --------------------------------------------------------------------------------------20
[c] SET UP ------------------------------------------------------------------------------------------21
9. WATER SUPPLYAND PLUMBING CONNECTIONS------------------------------------- 22
[a]UNITWITH REMOTE CONTROLLER, WATER SOFTENER &
WATERFILTER --------------------------------------------------------------------------------22
[b]UNIT WITH WATERTANK, WATERSOFTENER & WATER FILTER ------------- 25
10.OPERATIONMODESETTING-----------------------------------------------------------------29
11. FINAL CHECK LIST------------------------------------------------------------------------------- 32
IV. CHECKS BEFORE OPERATION ---------------------------------------------------------------33
1. CHECKINGAMOUNTOF REMAINING SALT WATER ----------------------------------- 33
2.MAKINGSALTWATER --------------------------------------------------------------------------33
3. PURGING SALTWATER SUPPLYPUMP---------------------------------------------------34
V.OPERATION-------------------------------------------------------------------------------------------35
1. START UP-------------------------------------------------------------------------------------------35
2. SHUT DOWN ---------------------------------------------------------------------------------------36
VI.MAINTENANCE -------------------------------------------------------------------------------------37
1. CHECKING pHANDAVAILABLE CHLORINE CONCENTRATION -------------------37
2. FLUSHINGALKALINEWATER PIPE---------------------------------------------------------37
3. CLEANING WATER LEVELSENSOR, SALT WATER FILTERAND
SALT WATER TANK------------------------------------------------------------------------------ 39
4. CHECKING WATER SOFTENER ------------------------------------------------------------- 39
5. CHECKING WATER FILTER--------------------------------------------------------------------40
6.EXTERIOR ------------------------------------------------------------------------------------------ 40
7. PREPARING WATER ELECTROLYZER FOR LONG STORAGE --------------------- 41
VII.TROUBLESHOOTING ----------------------------------------------------------------------------42
1. WHEN ELECTROLYTIC CELL REPLACE LAMP IS ON --------------------------------42
2. WHENADD SALT LAMP IS ON ---------------------------------------------------------------42
3. WHEN SERVICE CALL LAMP IS ON -------------------------------------------------------- 43
[a] CONTACTAUTHORIZED HOSHIZAKI SERVICE COMPANY --------------------- 43
[b] CHECK BY USER ---------------------------------------------------------------------------- 44
4. PROBLEMSWITHOUTALARM INDICATION ---------------------------------------------- 45
VIII.DAILYINSPECTIONSHEET -------------------------------------------------------------------- 46
ii

1
I. SPECIFICATIONS
1. NAMEPLATE RATING
See the Nameplate for electrical specifications. This Nameplate
is located on the lower right hand side of the Rear Panel.

2
2. DIMENSIONS/CONNECTIONS
Unit: inch (mm)

3
II. CONSTRUCTION
1. GENERAL
[1] Display Panel
See “II. 3. DISPLAY PANEL“.
[2] Lamp Board
Board with lamps indicating unit status.
[3] Control Box
See “II. 4. CONTROL BOX”.
[4] Flow Switching Valve
Changes the flow direction of electrolytic water.
[5] Microswitch [Direction]
Senses the direction of the Flow Switching Valve.
[6] Microswitch [Location]
Sensesthe locationof the FlowSwitchingValve.
[7] Gear Motor
Rotates the Impeller inside theFlow Switching Valve.
[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.
[11] Electrolytic Cell
Electrolyzes diluted salt water and generates acid and alkaline water.
[12] Leg
Not adjustable.
[4]
[6] [5] [3]
[7] [2] [1]
[8]
[9] [15]
[10]
[11] [14]
[12] [13]
[17]
[16] [18]
[19]
[20]
[21]
[26]
[22]
[25] [24] [23]

4
[13] Door
Provided with Door Lock.
[14] Door Lock
Locks the Door.
[15] Control Panel
See“II. 2. CONTROL PANEL”.
[16]Acid Water Outlet
Dispensesacidwaterduringthenormaloperationandalkalinewaterduringtheflushing
process.
[17]Alkaline Water Outlet
Dispensesalkalinewaterduringthenormaloperationandacidwaterduringtheflushing
process.
[18]WaterSupplyInlet
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 WaterTank Float Switches are connected to theTerminal Block or
the Remote Controller is connected to the Control Box.
[22] Blind Bushing
Removed when the WaterTank Float Switches are connected to theTerminal Block or
the Remote Controller is connected to the Control Box.
[23] Power Supply Cord
Flexible cord witha grounding conductor and groundingtype attachment plug.
[24] Drain Cap
Used for draining the pipes.
[25] Salt Water Hose
Made of PVC.
[26] Salt Water Filter
Removes foreign substances in salt water.

5
2. CONTROL PANEL
[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]FlushButton
Functions as a switch to flush thepipes beyond theacid and alkaline wateroutlets.
[7]SetButton
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
Turnstheunit On andOff.
[1]
[10]
[2]
[3]
[4]
[5] [9]
[6]
[7] [8]

6
[1] Dispense Button
Starts and stops dispensing electrolytic water.
[2] DispensingLamp (Green)
Indicates that the unit is producing water.
[3] Ready Lamp (Green)
Flashes untilthedesired settingsare achieved and stays on when the unit is dispensing
electrolytic water.
[4]Add Salt WaterLamp (Red)
Indicates that the Salt Water Tank level is too low.
[5] Flush Lamp (Red)
Stays on during the flush operation. Indicates that the unit is in flush cycle.
[6] Electrolytic Cell Replace Lamp (Red)
Indicates that the cell life is near completion. Flashes continuously from 2900 hours to
3000 hours and stays on after 3000 hours.
[7] Service Call Lamp (Red)
Indicates that there is trouble detected.
[7] [6] [5] [4] [3] [2] [1]
3. DISPLAY PANEL

7
4. CONTROL BOX
[1] Switching Regulator
Supplies power to start the Programmable Controller, etc.
[2] Noise Board
Board to remove noise in the unit.
[3] CurrentSensor
Reads amperage in the Electrolytic Cell.
[4] Operation Board
Board with switches to operate the Control Panel, etc.
[5] Magnetic Contactor
Switches polarity of the Electrolytic Cell.
[6] Relay 1
For [10] DC Power Supply.
[7] Relay 2
Controls the water level in the WaterTank.
[8] Relay 3
Switchesthe electrolytic water displayof the Remote Controller.
[9] DC Power Supply
Power supply for cells to generate electrolytic water.
[10] Programmable Controller
Manages all controls of the unit.
[11] Noise Filter
Removes noise from 1. [19] Electromagnetic Metering Pump.
[12] Ferrite Core (not shown)
Removes noise in the unit.
[1]
[2]
[3]
[12]
[4]
[11]
[5] [10]
[9]
[8]
[7]
[6]

8
5. REMOTE CONTROLLER (OPTION)
[1] Ready Lamp (Green)
Flashes untilthe desiredsettingsareachievedandstays onwhentheunitisdispensing
electrolytic water.
[2]Add Salt Water Lamp (Red)
Indicates that the Salt Water Tank level is too low.
[3]Electrolytic WaterLamp (Green)
The upper lamps willfunction during the normaloperation. Alkalinewaterisdispensed
fromthe left outletandacidfromtheright. Thelowerlamps willfunctionduringthe flush
operation only. Acid water is dispensed from the left outlet and alkaline water from the
right.
[4] Dispense Button
Starts and stops dispensing electrolytic water.
[5] Electrolytic WaterOutlet
Transportselectrolyticwater.
6. WATER TANK FLOAT SWITCHES (OPTION)
Includes the Upper and LowerAcid Water Tank Level Float Switches and Upper and Lower
Alkaline Water Tank Level Float Switches.
[1] [2] [3]
[4]
[5]

9
7. OUTLET VALVES (OPTION)
ConnectedwiththeElectrolyticWaterOutlets
(for acid and alkaline water outlets) on the
WaterTank. Useas needed.
8. ACCESSORIES
Connectors pH Testers ChlorineTester
InstructionManual InstructionSheet Cap
Gaskets Pressure Reducing Valve WaterSupply Hose
Braided Hoses Salt Measuring Cup Salt WaterTank Clamps

10
III. INSTALLATION AND OPERATING INSTRUCTIONS
1.CHECKS BEFORE INSTALLATION
IMPORTANT
1. Remove shipping carton and tape(s). If packaging material is left inthe water
electrolyzer, it will not work properly.
2. Use potable water. If water other than potable water is used, it may clog pipes,
cause poor performance, etc.
3. Purchase either the Remote Controller (Option) or Water Tank Float Switch
(Option).
4.Installawatersoftenerandwaterfilter(soldseparately)onthewaterelectrolyzer
to improve machine performance and prevent electrolytic cell damage, etc.
1) Be sure not to damage the panels when installing the water electrolyzer.
2) Remove the package containing the accessories.
3) See the Nameplate on the Rear Panel and check that the voltage supplied corresponds
with the voltage specified on the Nameplate.
2. HOW TO REMOVE PANELS
a) Rear Panel --------- Remove the screws.
Lift off slightly and pull toward you.
3. LOCATION
WARNING
1.Thiswaterelectrolyzerisnotintendedforoutdooruse.Normaloperatingambient
temperature shouldbe within +40°Fto 95°F (+5°Cto+35°C); Normal operating
water temperature should be within +40°F to 85°F(+5°C to +30°C). Operation
of the water electrolyzer for extended periods outside of these normal
temperature ranges may affect performance.
Fig. 2
Rear Panel

11
2. Do not installthe unit where exposed to humidity or splashing water. Reduction
in insulation propertymay cause an electric leak or shock. Locations should be
at least 6” above the floor to avoid splashing water during kitchen cleaning
operations.
3. Install adequate ventilating system. Hydrogen gas or chlorine gas may cause
health problems.
CAUTION
1. To prevent damage to the unit, do not move the unit with the Door open.
2.The unit should not be submerged in water orbecome wet.
3. Use glass, plastic or stainless steel containers for electrolytic water. Acid water
may corrode metal.
For best operating results:
*Thewaterelectrolyzershouldnotbe locatednexttoovens,grillsorotherhighheatproducing
equipment.
* Location should provide a firm and level foundation for the equipment.
*Allow 6” clearance at rear, sides and top for proper performance and ease of maintenance
and/orservice.
* Install the unit in a well-ventilated area. Use fans with diameter over 6 inches (standard air
flow rate: 270ft3/min (450m3/h)) if necessary.
4.ELECTRICAL CONNECTION
WARNING
1. This water electrolyzer must have a separate power supply or receptacle of
proper capacity. Branching off the Power Cord, using an extension cord or
sharing a single power supply with other appliances may result in an electric
shock, heat generation or fire.
2. The water electrolyzer requires a ground that meets the national and local
electrical code requirements.To prevent possibleelectricalshock to individuals
or extensive damage to equipment, plug the electrolyzer only into a properly
grounded electrical outlet.

12
CAUTION
The maximum allowable voltage variation should not exceed ±10 percent of the
rated voltage. Operation of the unit outside of this range may cause damage to
the unit or reduction of the performance.
* Usually an electricalpermit and services of a licensed electrician are required.
5. INSTALLATION OF WATER SOFTENER (SOLD SEPARATELY) AND
WATER FILTER (SOLD SEPARATELY)
[a] CHECKS BEFORE INSTALLATION
1) Unpack and remove shipping carton, tape(s) and other packaging material(s).
2) Check that all the necessary accessories are included.
3) Follow the Instruction Manual for the Water Softener and the Water Filter.
[b] LOCATION
* Install the Water Softener and Water Filterunder the same ambient temperature and water
temperatureconditions asthe waterelectrolyzer.
* Followthe Instruction Manual for the WaterSoftener and the Water Filter.
[c] SET UP
1) Installthe valves and pipesfollowing the Instruction ManualfortheWater Softenerand the
WaterFilter.
2) Install a water pressure gauge on the pipe of the primary side of the Water Softener and
secondary side of the Water Filter.
[d] ELECTRICAL CONNECTION
WARNING
1. This softener must have a separate power supply or receptacle of proper
capacity. Branching off the Power Cord, using an extension cord or sharing a
single power supply with otherappliances may result in an electricshock, heat
generation or fire.

13
2. The water softenerrequiresagroundthatmeetsthe national and localelectrical
code requirements. To prevent possible electrical shock to individuals or
extensive damage to equipment, plug the water softener onlyinto a properly
grounded electrical outlet.
CAUTION
The maximum allowable voltage variation should not exceed ±10 percent of the
rated voltage. Operation of the unit outside of this range maycause damage to
theunit orreductionof the performance.
* Usually an electricalpermit and services of a licensed electrician are required.
[e] WATER SUPPLY AND PLUMBING CONNECTIONS – See Fig. 3
CAUTION
Do not runthe Water Softener and the Water Filteruntil theproper water pressure
is reached.
*Forpiping of the Water Softener and WaterFilter, follow theInstruction Manual forthe Water
Softener and the Water Filter.
* Adjust water pressure so that discharge pressure after pipes are connected will be within
15-115PSIG (0.10-0.78MPa). Also adjustwater supplypressure so thatit will be within the
specified value in the specifications for the Water Softener and the Water Filter(softener is
NSFrated at 120PSI and flow of 2gal./min.).
* Install a water pressure gauge on the pipe of the primary side of the Water Softener and
secondary side of the Water Filter.
* For air gap between the drain pipe ends or hose ends and a sink or floor drain, follow the
Instruction Manualforthe WaterSoftener.
* Be sure to flush out anew watersoftenerthoroughlyto a sinkor drain before connectingit to
the waterelectrolyzer.
* A plumbing permit and services of a licensed plumber may be required in some areas.

14
Fig. 3
* General piping example forthe Water Softener and Water Filter
Water Pressure Gauge
Drain Outlet
WaterSoftener
DrainOutlet for
RegenerationTank
InletValve
Drain
Water Supply
(Potablewater)
Bypass Valve
Water Filter
Soft Water
WaterPressureGauge
InspectionValve
Outlet Valve
PowerCord
6. INSTALLATION OF REMOTE CONTROLLER (OPTION)
[a] CHECKS BEFORE INSTALLATION
1) Unpack and remove shipping carton, tape(s) and other packaging material(s).
2) Check that all the necessary accessories are included.
3) Check that the Remote Controller and water electrolyzer are installed so that the cables
and connection hoses of the Remote Controller can reach the water electrolyzer.
4) Check if there is any serious damage, broken cable, etc.
[b] LOCATION
WARNING
1.Thisremotecontrollerisnotintendedforoutdooruse. Normaloperatingambient
temperature shouldbe within +40°Fto 95°F (+5°Cto+35°C); Normal operating
water temperature should be within +40°Fto 85°F(+5°Cto +30°C). Operation

15
of the remote controller for extended periods outside of these normal
temperature ranges may affect performance.
2. Do not install the remote controller where exposed to humidity or splashing
water. Reduction in insulation property may cause an electric leak or shock.
3.Installanadequateventilatingsystem. Hydrogengas orchlorinegasmaycause
health problems.
CAUTION
1. Avoid a site where dripping is not allowed. Condensation may form on the
exteriorin high humidity and could drip onto the floor.
2. Use glass, plastic or stainless steel containers for electrolytic water. Acid water
may corrode metal.
For best operating results:
*TheRemoteControllershouldnotbelocatednexttoovens,grillsorotherhighheatproducing
equipment.
* Location should provide a firm and level foundation for the equipment.
* Install the unit in a well-ventilated area. Use fans with diameter over 6 inches (standard air
flow rate: 270ft3/min (450m3/h)) if necessary.
[c] SET UP
CAUTION
Use the Accessory Braided Hoses, Connectors and Gaskets for electrolytic water
piping. Other materials may cause corrosion and water leakage.
1) Secure the Remote Controller to the Bracket with M4 x 8 Tapping Screws (Accessory) as
shown in the illustration. See Fig. 4.
2) Attach the PVC Braided Hose to the Connector withthe Clamp. See Fig. 5.
3) Attach the Connectors to the water electrolyzer with the Gaskets between the Connectors
and the water electrolyzer. Make sure to check the connection locations for theAcid and
Alkaline Water Hoses. See Fig. 6.
4) Drive M6 anchor bolts into the wall or attach a sheet metal part to the wall to attach the

16
Bracket. Thespace between bracket holes is 7” and there are two8mm holes.
5)Attach the Electrolytic Water Pipesto the Remote Controller after the Remote Controller is
installed on the wall. Make sure that there are Gaskets on the end of the Pipes.
Note: The vertical height of the hoses for electrolytic water should be a maximum of 80” and
the total piping length should be within the range that the PVC Braided Hose can
reach. The electrolytic water may not be able to flow or the flow rate may not be
maintained if the total piping length is outside this range. Adjust the pipe length using
the PVC Braided Hose to maintain the proper performance of the electrolytic water.
InstalltheRemoteControllersothatthe outletsarelocatedabovetheunit. Thedifference
in the gas amount between acid water and alkaline water may change the flow rate
balance and cause poor performance.
TappingScrew
Bracket
Remote Controller
Fig. 4 Fig. 5
Fig. 6
PVC Braided Hose
Clamp
Connector
Install the Remote
Controller so thatthe
outlets are located
above the unit.
The vertical height and
totalpipinglengthshould
be within the range that
the PVC Braided Hose
can reach.
6)Attach the caution label (Accessory) in readily visible position near the Remote Controller.
Remote Controller Gasket
Acid Water Hose Alkaline
WaterHose
Gasket Alkaline
WaterHose
Acid Water
Hose
Water Electrolyzer
Fig. 7