Hoshizaki ROX-20TB2-U User Manual

Hoshizaki America, Inc.

Hoshizaki

Water Electrolyzer

Model

ROX-20TB2-U

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number: X002-858 Issued: 3-9-2012

IMPORTANT

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 warranty coverage.

Hoshizaki provides this manual primarily to assist qualified service technicians in the maintenance and service of the unit.

Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, write, or send an e-mail message to the Hoshizaki Technical Support Department for assistance.

HOSHIZAKI AMERICA, INC. 618 Highway 74 South Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Phone: 1-800-233-1940 Technical Support (770) 487-2331 Fax: 1-800-843-1056 (770) 487-3360 E-mail: techsupport@hoshizaki.com

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

IMPORTANT

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 further reference that may be necessary.

I. GENERAL INFORMATION --------------------------------------------------------------------------5

1. SAFETY INSTRUCTIONS -------------------------------------------------------------------------5

2. PRODUCT INFORMATION -----------------------------------------------------------------------7 [a] FEATURES ----------------------------------------------------------------------------------------7 [b] MODEL NAME -----------------------------------------------------------------------------------8

3. DIMENSIONS/SPECIFICATIONS ---------------------------------------------------------------9

4. PERFORMANCE DATA -------------------------------------------------------------------------- 10

II. TECHNICAL INFORMATION --------------------------------------------------------------------- 11

1. PRINCIPLE OF ELECTROLYSIS -------------------------------------------------------------- 11

2. CONSTRUCTION ---------------------------------------------------------------------------------- 14 [a] GENERAL --------------------------------------------------------------------------------------- 14 [b] MECHANISM ----------------------------------------------------------------------------------- 16 [c] CONTROL BOX -------------------------------------------------------------------------------- 17

3. WIRING DIAGRAM -------------------------------------------------------------------------------- 19

4. WATER CIRCUIT ---------------------------------------------------------------------------------- 20

5. FUNCTIONS AND OPERATION --------------------------------------------------------------- 21 [a] NORMAL MODE ------------------------------------------------------------------------------- 21 [b] SHORT MODE --------------------------------------------------------------------------------- 21 [c] ADJUSTMENT MODE ------------------------------------------------------------------------ 21 [d] CHECK MODE --------------------------------------------------------------------------------- 22

CONTENTS

PAGE

III. SERVICE INFORMATION ------------------------------------------------------------------------ 27

1. ERROR CODES ----------------------------------------------------------------------------------- 27

2. SERVICE DIAGNOSIS --------------------------------------------------------------------------- 27

3. FLOW RATE ADJUSTMENT -------------------------------------------------------------------- 29

4. REMOVAL AND REPLACEMENT OF COMPONENTS ---------------------------------- 30 [a] ELECTROLYTIC CELL ----------------------------------------------------------------------- 30

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

NOTICE

Indicates a situation which could result in damage to the unit or

IMPORTANT

In the context of this manual, the term "sanitizing water" refers to acidic water and "cleaning water" refers to alkaline water.

Indicates a hazardous situation which could result in death or

serious injury.

property.

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 expressly conceived. Any other use should be considered improper and therefore dangerous. The manufacturer cannot be held responsible for injury or damage resulting from improper, incorrect, and unreasonable use.

To reduce the risk of death, electric shock, serious injury, or ﬁ re, follow basic precautions including the following:

• Only qualiﬁ ed service technicians should install and service the unit.

• This unit must be installed in accordance with applicable national, state, and local codes and regulations.

• This unit requires an independent power supply. See the nameplate for proper voltage and breaker/fuse size. Failure to use a proper breaker or fuse can result in a tripped breaker, blown fuses, or damage to existing wiring. This could lead to heat generation or ﬁ re.

• THIS APPLIANCE MUST BE GROUNDED. This appliance is equipped

with a NEMA 5-15 three-prong grounding plug to reduce the risk of potential shock hazards. It must be plugged into a properly grounded, independent 3-prong wall outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a qualified electrician replace it with a properly grounded, independent 3-prong wall outlet. Do not remove the ground prong from the power cord and do not use an adapter plug. Failure to follow these instructions may result in death, electric shock, or ﬁ re.

• Turn off the power supply before servicing. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.

• Do not make any alterations to the unit. Alterations could result in electric shock, injury, ﬁ re, or damage to the unit.

• This unit is not intended for outdoor use (including under canopy). Exposure to rain may cause electric leak or shock. Direct sunlight can damage the plastic tank exterior, resulting in cracks and water leaks.

• 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 may cause health problems or corrosion of surrounding equipment.

• Do not use a flame near a container or tank holding electrolyzed water. Hydrogen gas from cleaning water may cause ignition.

I. GENERAL INFORMATION

1. SAFETY INSTRUCTIONS

The following instructions contain important safety precautions and should be strictly observed.

WARNING

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 ground 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 ﬁ re.

5. Check for proper part installations, wiring conditions and soldered or solderless terminal connections to avoid smoke, ﬁ re or electric shocks.

6. Be sure to replace damaged or deteriorated power cords and lead wires to prevent electric shocks, ﬂ ames 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 ﬁ re.

8. After servicing, always use a megohmmeter (500VDC) to check for the insulation resistance of minimum 1 megohm between the live part (attachment plug) and the dead metal part (ground terminal). Negligence in checking may cause electric leaks or shocks.

9. Do not service the electrical parts with wet hands to prevent electric leaks or shocks.

10. Always ask the user to keep children away from the work area. They may be injured by tools or disassembled products.

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 LOCATIONS

The following caution labels are attached where special care should be taken.

On top panel

Inside door

2. PRODUCT INFORMATION

[a] FEATURES

1) Space saving

The compact unit [W11" x D16" x H12" (W280 x D400 x H310 mm)] allows for

installation under sink.

2) Various optional parts available

Float switch: Detects the tank water level to automatically

start/stop operation. Includes the upper and lower sanitizing water tank level float switches and upper and lower cleaning water tank level ﬂ oat switches.

Outlet valve: Allows use of electrolyzed water stored in

the tank, as required. Connected with the electrolyzed water outlets [for sanitizing and cleaning water outlets] on the water tank. Use as needed [yellow for sanitizing water, blue for cleaning water].

3) Concentrated salt water direct injection system

Direct addition of concentrated salt water held in the salt water tank (accessory) into

the water ﬂ ow 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 efﬁ ciency, resulting in stable concentration of available chlorine.

6) Available chlorine concentration 20 - 30 mg/L or more

Sanitizing water contains undissociated hypochlorous acid (HOCl) which sanitizes

faster than sodium hypochlorite (NaOCl) and does not leave residue.

7) Built-in ﬂ ow rate adjusting valve

The built-in ﬂ ow rate adjusting valve automatically controls the ﬂ ow rate according to

the selection (low, medium, high).

[b] MODEL NAME

ROX - 20 T B2 - U

For USA Development order Table-top or under-sink installation Maximum ﬂ ow rate (x 0.1 L/min) Hoshizaki water electrolyzer

3. DIMENSIONS/SPECIFICATIONS

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