Yamato Autostill WG251/1001 User manual

Water Purifier
Autostill®
Models WG251/1001
Instruction Manual
First Edition
Yamato Scientific America Inc.
Santa Clara，CA
Printed on recycled paper
Thank you for choosing WG series Water
Purifier Autostill®from Yamato Scientific Co.,
Ltd.
For proper equipment operation, please read
and become thoroughly familiar with this
instruction manual before use. Always keep
equipment documentation safe and close at
hand for convenient future reference.
Warning: Read instruction manual warnings
and cautions carefully and
completely before proceeding.

TABLE OF CONTENTS
1. SAFETY PRECAUTIONS..............................................................................................................1
Explanation of Symbols.....................................................................................................................1
Symbol Glossary ...............................................................................................................................2
Warnings and Cautions.....................................................................................................................3
Residual Risk Map ............................................................................................................................6
List of Residual Risks........................................................................................................................7
2. COMPONENT NAMES AND FUNCTIONS...................................................................................9
Main Unit...........................................................................................................................................9
Dispenser tray / Multipurpose Distilled Water Outlet .......................................................................11
UV Sterilization Light (Optional) ......................................................................................................13
Piping System Diagram...................................................................................................................14
Operation Principles........................................................................................................................15
Control Panel ..................................................................................................................................18
3. PRE-OPERATION PROCEDURES.............................................................................................19
Installation Precautions ...................................................................................................................19
Installation Procedure .....................................................................................................................21
4. PRE-OPERATION PREPARATIONS .........................................................................................28
Preparations before Use .................................................................................................................28
5. OPERATION PROCEDURES .....................................................................................................29
Initial Operation ...............................................................................................................................29
Pure Water Collection .....................................................................................................................30
Measured-amount Collection of Ion Exchanged Water ...................................................................31
Measured-amount Collection of Distilled Water ..............................................................................32
Draining dispenser tray ...................................................................................................................33
Water Quality Readout ....................................................................................................................34
Setting/Displaying Submenu ...........................................................................................................37
6. HANDLING PRECAUTIONS.......................................................................................................40
Warnings and Cautions...................................................................................................................40
7. INSPECTION AND MAINTENANCE...........................................................................................41
Precautions before Inspection.........................................................................................................41
Precautions in Daily Maintenance ...................................................................................................41
Maintenance and Inspection ...........................................................................................................41
Replacement of Ion-exchange Resin Cartridge...............................................................................42
Pre-treatment Cartridge Replacement ............................................................................................42
Heater Replacement Procedure......................................................................................................42
Reset after Consumables Replacement..........................................................................................44
Inspect Breaker ...............................................................................................................................45
Inspect Power Plug .........................................................................................................................45
Washing of Distiller .........................................................................................................................46
Cleaning Water Supply Hose Filter .................................................................................................51
8. EXTENDED STORAGE AND DISPOSAL ..................................................................................52
Extended Storage ...........................................................................................................................52
Disposal Considerations .................................................................................................................52
9. TROUBLESHOOTING ................................................................................................................55
Error Indications and Descriptions ..................................................................................................55

Troubleshooting Guide....................................................................................................................59
10. SERVICE & REPAIR .................................................................................................................61
Requests for Repair ........................................................................................................................61
11. SPECIFICATIONS.....................................................................................................................62
12. WIRING DIAGRAM ...................................................................................................................63
WG251 Wiring Diagram ..................................................................................................................63
WG1001 Wiring Diagram ................................................................................................................64
13. REPLACEMENT PARTS LIST..................................................................................................65
Consumables ..................................................................................................................................65
14. OPTIONAL ACCESSORIES .....................................................................................................66
List of Options .................................................................................................................................66
15. LIST OF HAZARDOUS SUBSTANCES ...................................................................................67
16. STANDARD INSTALLATION MANUAL...................................................................................68

1
1. SAFETY PRECAUTIONS
Explanation of Symbols

2
1. SAFETY PRECAUTIONS
Symbol Glossary
WARNING / CAUTION
General Warning Danger!
High Voltage
Danger!
Extremely Hot
Danger!
Moving Parts
Danger!
Blast Hazard
Caution:
Water Only
Caution:
Shock Hazard!
Caution:
Burn Hazard!
Caution:
Do Not Heat
Without Water!
Caution:
May Leak Water!
Caution:
Toxic Chemicals
RESTRICTION
General
Restriction No Open Flame Do Not
Disassemble Do Not Touch
ACTION
General Action
Required
Connect Ground
Wire Level Installation Disconnect Power Inspect
Regularly

3
1. SAFETY PRECAUTIONS
Warnings and Cautions
WARNING
Install in a location free of flammables and explosives.
Never install or operate unit in a flammable or explosive gas atmosphere. Unit is NOT fire
or blast resistant. Simply switching earth leakage breaker (ELB) "ON" or "OFF" can
produce a spark, which can then be relayed during operation, causing fire or explosion
when near flammable or explosive fluids, chemicals or gases/fumes.
See "15. LIST OF HAZARDOUS SUBSTANCES" (P.67) for information on flammable and
explosive gases.
Ground
wire MUST be connected properly (WG251)
Connect power cable to a grounded outlet in order to avoid electric shock.
Never connect ground wire to gas lines, water pipes, telephone grounding lines or
lightning rods. Doing so may result in fire, electric shock or equipment malfunction.
Never insert multiple plugs into a single outlet. Doing so may result in power cable
overheating, fire or drop in voltage.
Connect to grounded outlet
Grounded outlet
When no ground terminal is found
Contact original dealer of purchase
for location-specific electrical
requirements.
Ground
wire MUST be connected properly (WG1001)
If no ground terminals found, contact original dealer of purchase for location-specific
electrical requirements.
Securely connect to a distribution board.
No power plugs or connectors of any kind are included with WG251/1001. When using a
power plug, use a plug that meets the voltage and electrical capacity.
Core color Wiring on
distribution board
White Neutral
Black Live
Green Ground
Never connect ground wire to gas lines, water pipes, telephone grounding lines or
lightning rods. Doing so may result in fire, electric shock or equipment malfunction.
Grounding prong
Grounded plug

4
1. SAFETY PRECAUTIONS
Warnings and Cautions
Turn OFF (○) ELB immediately when an abnormality occurs.
If unit begins emitting smoke or abnormal odors for reasons unknown, turn OFF (○) ELB
immediately, disconnect power cable from power supply, and contact original dealer of
purchase for assistance. Continuing to operate without addressing abnormalities may
cause fire or electric shock, resulting in serious injury or death. Never attempt to
disassemble or repair unit. Repairs should always be performed by a certified technician.
Handle power cable with care.
・DO NOT operate equipment with power cable bundled or tangled. Operating unit with
power cable bundled or otherwise tangled, may cause power cable to overheat and/or
catch fire.
・Do not modify, bend, forcibly twist or pull on power cable. Fire or electric shock may result.
・Do not risk damage to power cable by positioning it under desks or chairs, or by allowing
it to be pinched between objects. Doing so may cause fire and/or electric shock.
・Do not place power cable near kerosene/electric heaters or other heat-generating
devices. Doing so may cause power cable insulation to overheat, melt and/or catch fire,
which may result in electric shock.
・Turn off ELB immediately and disconnect from facility terminal or outlet, if power cable
becomes partially severed or damaged in any way. Contact original dealer of purchase
for information about replacing power cable. Failure to do so may result in fire or electric
shock.
・Always connect power cable to appropriate facility outlet or terminal.
Do not disassemble or modify equipment
Never attempt to disassemble or modify unit. Doing so may cause malfunction, fire,
electric shock, or personal injury. Note that any malfunction resulting from unauthorized
modifications or customizations to unit will void the warranty and are not the responsibility
of Yamato.
DO NOT climb or place any objects on top of equipment.
Personal injury or equipment malfunction may result due to falling.
Do not place any products other than those specified as options on top unit.

5
1. SAFETY PRECAUTIONS
Warnings and Cautions
CAUTION
DO NOT operate equipment during thunderstorms
In the event of a thunderstorm, turn off ELB and disconnect power cable immediately. A
direct lightning strike may cause equipment damage, fire or electric shock, resulting in
serious injury or death.
Turn OFF (○) ELB in case of power failure.
Operation stops when power failures occur. For added safety however, turn OFF (○) ELB
in the event of a power failure.
Handle scale cleaner (Orgazole) with care.
The main component of Orgazole 10 scale cleaner is sulfamic acid (the pH of the water
solution is about 1). Always wear protective equipment (gloves, mask, and glasses) when
handling the cleaner. If the cleaner comes in contact with any part of human body, wash
thoroughly with clean water.

6
1. SAFETY PRECAUTIONS
Residual Risk Map
These figures indicate positions of caution labels.
The numbers shown in the figure indicate the numbers listed in the "List of Residual Risks" in
this manual.
For details of individual residual risks, see the List of Residual Risks.
Contact us if the caution signs are no more visible because nameplate is peeled off or
texts are eliminated. We will send you a new nameplate. (for charge)
[WG251][WG1001]
Rating label: 2, 5, 8

7
1. SAFETY PRECAUTIONS
List of Residual Risks
List of residual risks (instructions for risk avoidance)
This list summarizes residual risks to avoid personal injuries or damages to properties during or
related to the use of equipment.
Be sure to fully understand or receive instructions on how to use, maintain and inspect
equipment before starting operation.
Loading/Installation
№Degree of
risks
Risk
description Protective measures taken by the user Relevant page(s)
1 CAUTION Injury
Use cargo-handling equipment for
transportation and installation. Transport unit
with sufficient number of people and an
appropriate work method when carrying out
manually.
19
2 WARNING Fire/
Electric shock Carefully select an installation site. 19
3 CAUTION Injury Install unit on a level surface. 20
4 CAUTION Injury Take appropriate safety measures when
installing. 20
5 WARNING Explosion/Fire
Install in a location free of flammables and
explosives. 3
6 WARNING Fire/
Electric shock
Always connect power cable to appropriate
facility outlet or terminal. 20
7 WARNING Fire/
Electric shock Handle power cable with care. 4
8 WARNING Fire/
Electric shock Ground wire MUST be connected properly 3
9 WARNING Fire/
Electric shock DO NOT disassemble or modify. 4
Use
№Degree of
risks
Risk
description Protective measures taken by the user Relevant page(s)
10 WARNING Fire/
Electric shock
Turn OFF (○) ELB immediately when an
abnormality occurs. 4
11 CAUTION Fire Turn OFF (○) ELB when the unit stops due to a
power failure during operation. 40
12 WARNING Burn DO NOT touch hot surfaces. 40
13 WARNING Injury DO NOT climb or place any objects on top of
equipment. 4
14 WARNING Fire DO NOT operate equipment during
thunderstorms 5
15 CAUTION Injury Handle scale cleaner (Orgazole) with care. 5

8
1. SAFETY PRECAUTIONS
List of Residual Risks
Daily inspection/maintenance
№Degree of
risks
Risk
description Protective measures taken by the user Relevant page(s)
16 WARNING Fire/
Electric shock
Remove the power cable for inspection and
maintenance. 41
17 WARNING Burn Perform inspections and maintenance when unit
is at room temperature. 41
18 WARNING Fire/
Electric shock NEVER disassemble or modify unit 4
Extended storage/disposal
№Degree of
risks
Risk
description Protective measures taken by the user Relevant page(s)
19 CAUTION Injury Do not leave unit in a location where children
may have access 52

9
2. COMPONENT NAMES AND FUNCTIONS
Main Unit
WG251
Boiler
Heater
Heater terminal
block
Ion-exchange resin cartridge (CPC-S)
Distilled water tank Reset switch
Drain cock
Dispenser tray
Leak sensor
Pre-treatment cartridge
Earth leakage breaker (ELB)
Drain port (on each side)
Multipurpose distilled
water outlet
Ion exchanged water
outlet
Distilled water outlet
Dispenser tray drain switch
Serial number label
Control panel

10
2. COMPONENT NAMES AND FUNCTIONS
Main Unit
WG1001
Control panel
Reset switch
Ion-exchange resin (CPC-S)
Boiler
Heater
Pre-treatment
cartridge
Tank
Leak sensor
Serial number label
Dispenser tray drain
switch
Multipurpose distilled water
outlet
Leak sensor
Earth leakage breaker (ELB)
Drain port (on each side)

11
2. COMPONENT NAMES AND FUNCTIONS
Dispenser tray / Multipurpose Distilled Water Outlet
Dispenser tray
Draw out dispenser tray when using. The load capacity of the tray is 10 kg for WG251 and 20 kg for
WG1001. Cooling water for condenser is used to drain water that has accumulated on dispenser tray.
Press the drain switch on the right side of dispenser tray under the following conditions. Cooling water
flows for one minute, and water will be drained from the tray. Thereafter, unit automatically returns to the
state before pressing the switch.
① When the tank is full (distillation is stopped)
② When collecting ion exchanged water
③ In the standby state (ELB is "ON(|)", the POWER key is "OFF(○)")
WG251
WG1001
Multipurpose distilled water outlet
The multipurpose distilled water outlet is located on the right side of unit and equipped with
one-touch joint (see P.12 for handling). Pull out the plug and connect the rigid tube with an O.D.
of φ8 mm. This allows to collect distilled water directly from the tank. It can also be used as a
connection port for options, etc.
* Note that the one-touch joint does not have a check valve function, so that water will come out when
the plug or tube is detached.
Dispenser tray drain
switch Dispenser tray
Multipurpose distilled
water outlet
Dispenser tray
drain switch
Dispenser tray
Multipurpose distilled
water outlet

12
2. COMPONENT NAMES AND FUNCTIONS
Dispenser tray / Multipurpose Distilled Water Outlet
Handling of one-touch joint
When using the multipurpose distilled water outlet, attach and detach the plug and tube by following
procedure.
Note that the one-touch joint does not have a check valve function, so that water will come out when the
plug or tube is detached.
● Insertion of the tube
1. Check that the tube is cut at right angles, not deformed, and has no scratch or damage in the outer
surface.
2. Insert the tube firmly deep into the one-touch joint. Unless the tube is inserted properly, water
leakage may result.
3. After inserted, pull the tube to ensure that it does not come out.
● Removal of the tube
Push the release ring evenly in and pull out the tube.
Be sure to push the ring deep downward, or the tube may not be pulled out or may get worn away,
letting its shavings remain inside the joint.
Release ring

13
2. COMPONENT NAMES AND FUNCTIONS
UV Sterilization Light (Optional)
UV sterilization light
* Extended irradiation with UV light may deteriorate distilled water tank and other components.
Over time, bacteria grows in stored distilled water in the tank, decreasing its quality. This unit employs
a UV sterilization light that is effective in eliminating bacteria. The light can be turned on at regular
interval or manually.
Automatic operation: The UV light comes on for up to 10 minutes every 24 hours once ELB of unit is
turned ON (|)
.
The duration of UV irradiation differs by the distilled water tank level.
WATER LEVEL lamp
Manual operation: This enables UV light to be turned on manually by selecting "ON" from "UV
light manual operation" in the submenu. The duration of time that the UV light stays on also
depends on the water level of the tank.
(The lighting cycle of automatic operation does not change even if the light is manually turned on
in automatic operation.)
[UV lighting time]
ELB ON (|)
UV automatic
operation
UV manual
operation
Distilled water tank
Tank level 1
Tank level 2
Tank level 3
Tank level 4
Tank level 5
UV sterilization light
24 h
10 min
POWER-ON
24 h
10 min
24 h 24 h
Tank level 1: 10 min
Tank level 2: 8 min
Tank level 3: 6 min
Tank level 4: 4 min
Tank level 5: 2 min

14
2. COMPONENT NAMES AND FUNCTIONS
Piping System Diagram
①Pressure reducing valve ⑯Distilled water quality gauge electrode
②Pressure switch ⑰Solenoid valve for boiler water supply
③Solenoid valve for cooling water ⑱Solenoid valve for initial distilled water drain
④Solenoid valve for raw water supply ⑲Solenoid valve for ion-exchanged water
collection
⑤Pre-treatment cartridge ⑳Solenoid valve for distilled water collection
⑥Ion-exchange resin cartridge (CPC-S) ㉑Ion exchanged water flow rate sensor
(two for WG1001) ㉒Distilled water flow rate sensor
⑦Float cylinder ㉓Ion-exchanged water outlet
⑧Float switch (1) ㉔Distilled water outlet
⑨Float switch (2) ㉕Distilled water tank
⑩Solenoid valve for boiler drainage ㉖Float switch (3)
⑪Boiler drain cock ㉗Air filter
⑫Boiler ㉘Distilled water dispensing pump
⑬Heater ㉙Distilled water tank drain port
⑭Condenser ㉚Multipurpose distilled water outlet
⑮Ion exchanged water quality gauge electrode. ㉛Aspirator
㉜Membrane filter
To water
collection table

15
2. COMPONENT NAMES AND FUNCTIONS
Operation Principles
The operation principles of WG251/1001 for each process is defined as follows.
(1) Boiler drainage
●Turn ON (|) ELB and press the POWER key. ⑩Solenoid valve for boiler drainage opens for about 30
seconds to perform initial boiler drainage (WG251 only). Boiler drainage is also performed once every
five hours of distillation.
(2) Boiler water supply and distilling operation
●When boiler drainage completes, ④Solenoid valve for raw water supply and ⑰Solenoid valve for
boiler water supply open simultaneously. Then water is supplied to ⑫Boiler. When ⑧Float switch (1) in
the ⑦Float cylinder detects the water level, ⑬Heater is energized to start distillation. At this moment,
③Solenoid valve for cooling water opens as well. The water supply to ⑫Boiler is regulated by opening
and closing ④Solenoid valve for raw water supply and ⑰Solenoid valve for boiler water supply, using
⑨Float switch (2).
To water
collection table
To water
collection table

16
2. COMPONENT NAMES AND FUNCTIONS
Operation Principles
(3) Flow of cooling water
●During distillation, cooling water flows and drains through ①Reducing valve, ③Solenoid valve for
cooling water, ⑭Condenser. Distillation stops when the ㉕Distilled water tank is full, or while collecting
ion exchanged water. Cooling water also stops automatically.
(4) Collecting distilled water
●⑱Solenoid valve for initial distilled water drain opens for about 10 minutes from the start of distillation
and the distilled water condensed in the ⑭Condenser flows out as initial distilled water. Then,
⑱Solenoid valve for initial distilled water drain closes, and distilled water is stored in ㉕Distilled water
tank. When float switch in the tank works, it is judged that the water is full and distillation stops. When
distilled water is consumed at a certain level, unit automatically begins to produce distilled water.
Stored distilled water is dispensed by ㉘Distilled water dispensing pump through ⑳Solenoid valve for
distilled water collection →㉒Distilled water flow rate sensor →㉜Membrane filter (㉔Distilled water
outlet).
To water
collection table
To water
collection table

17
2. COMPONENT NAMES AND FUNCTIONS
Operation Principles
(5) Collecting ion exchanged water
●Ion exchanged water is dispensed by way of ①Reducing valve, ④Solenoid valve for raw water
supply, ⑤Pre-treatment cartridge, ⑥Ion-exchange resin cartridge (CPC-S), ⑮Ion exchanged water
quality gauge electrode, ⑲Solenoid valve for collecting ion exchanged water, ㉑Ion exchanged
water flow sensor, ㉓Ion exchanged water outlet, and ㉜Membrane filter.
To water
collection table