Yamato DKN 812 User manual

Forced Convection
Constant Temperature Drying Oven
Model
DKN 302/402/602
612/812/912
Instruction Manual
- First Edition -
Yamato Scientific Co. LTD.
zThank you for purchasing "Forced Convection
Constant Temperature Drying Oven, DKN
Series" of Yamato Scientific Co., Ltd.
zTo use this unit properly, read this "Instruction
Manual" thoroughly before using this unit.
Keep this instruction manual around this unit for
referring at anytime.
WARNING!:
Carefully read and thoroughly understand the
important warning items described in this
manual before usin
g
this unit.

Contents
Cautions in Using with Safety................................................................1
•Explanation....................................................................................................................1
•Table of Illustrated Symbols ..........................................................................................2
•Fundamental Matters of "WARNING!" and "CAUTION!"...............................................3
Before Using this unit.............................................................................4
•Requirements for Installation.........................................................................................4
Description and Function of Each Part.................................................9
•Main Unit.......................................................................................................................9
•Control Panel...............................................................................................................12
•Characters of the Controller........................................................................................ 13
Operation Method .................................................................................14
•Operation Mode and Function List.............................................................................. 14
•Operation Mode, Function Setting Key, and Characters.............................................16
•Setting of Overheating Prevention Device ..................................................................17
•Fixed Temperature Operation......................................................................................18
•Quick Auto Stop Operation..........................................................................................19
•Auto Stop Operation.................................................................................................... 20
•Auto Start Operation....................................................................................................22
•Program Operation......................................................................................................24
•Other Functions...........................................................................................................31
Handling Precautions ...........................................................................32
Maintenance Method.............................................................................34
•Daily Inspection and Maintenance ..............................................................................34
Long storage and disposal...................................................................35
•When not using this unit for long term / When disposing............................................35
In the Event of Failure….......................................................................36
•Safety Device and Error Code..................................................................................... 36
•Trouble Shooting.........................................................................................................37
After Service and Warranty ..................................................................38
Specification..........................................................................................39
Wiring Diagram......................................................................................40
Replacement Parts Table......................................................................44
Reference...............................................................................................45
•List of Dangerous Substances ....................................................................................45

1
Cautions in Using with Safety
Explanation
MEANING OF ILLUSTRATED SYMBOLS
Various symbols are used in this safety manual in order to use the unit without
danger of injury and damage of the unit. A list of problems caused by ignoring
the warnings and improper handling is divided as shown below.Be sure that you
understand the warnings and cautions in this manual before operating the unit.
WARNING! If the warning is ignored, there is the danger of a problem that
may cause a serious accident or even fatality.
CAUTION! If the caution is ignored, there is the danger of a problem that may
cause injury/damage to property or the unit itself.
Meaning of Symbols
This symbol indicates items that urge the warning (including the caution).
A detailed warning message is shown adjacent to the symbol.
This symbol indicates items that are strictly prohibited.
A detailed message is shown adjacent to the symbol with specific actions not to
perform.
This symbol indicates items that should be always performed.
A detailed message with instructions is shown adjacent to the symbol.
Illustrated Symbols

2
Cautions in Using with Safety
Table of Illustrated Symbols
Warning
Warning,
generally Warning, high voltage Warning, high temperature Warning, drive train Warning, explosive
Caution
Caution,
generally Caution, electrical shock Caution, scald Caution, no road heating Caution, not to drench
Caution,
water only Caution, deadly poison
Prohibit
Prohibit,
generally Prohibit, inflammable Prohibit, to disassemble Prohibit, to touch
Compulsion
Compulsion,
generally Compulsion, connect to the
grounding
terminal
Compulsion,
install on a flat
surface
Compulsion,
disconnect the
power plug
Compulsion,
periodical
inspection

3
Cautions in Using with Safety
Fundamental Matters of "WARNING!" and "CAUTION!"
WARNING!
Do not use this unit in an area where there is flammable or explosive gas
Never use this unit in an area where there is flammable or explosive gas. This unit is not
explosion-proof. An arc may be generated when the power switch is turned on or off, and
fire/explosion may result. (Refer to page 45 "List of Dangerous Substances".)
Always ground this unit
Always ground this unit on the power equipment side in order to avoid electrical shock due to a power
surge.
If a problem occurs
If smoke or strange odor should come out of this unit for some reason, turn off the power key right
away, and then turn off the circuit breaker and the main power. Immediately contact a service
technician for inspection. If this procedure is not followed, fire or electrical shock may result. Never
perform repair work yourself, since it is dangerous and not recommended.
Do not use the power cord if it is bundled or tangled
Do not use the power cord if it is bundled or tangled. If it is used in this manner, it can overheat and
fire may be caused.
Do not process, bend, wring, or stretch the power cord forcibly
Do not process, bend, wring, or stretch the power cord forcibly. Fire or electrical shock may result.
Substances that can not be used
Never use explosive substances, flammable substances and substances that include explosive or
flammable ingredients in this unit. Explosion or fire may occur. (Refer to page 45 "List of Dangerous
Substances".)
Do not disassemble or modify this unit
Do not disassemble or modify this unit. Fire or electrical shock or failure may be caused.
Do not touch high-temperature parts
The inside of the body or the door may become hot during and just after operation. It may cause burns.
CAUTION!
During a thunder storm
During a thunderstorm, turn off the power key immediately, then turn off the circuit breaker and the main
power. If this procedure is not followed, fire or electrical shock may be caused.

4
Before Using this unit
Requirements for Installation
WARNING!
1. Always ground this unit
•The DKN302, DKN402and DKN602 types use a 100V power source.
•The DKN612, DKN812 and DKN912types use a single-phase 200V power source. Please
consult your local electrical contractor for power connecting work.
•Be sure to connect the earth wire (the green cable of power cord) to the grounding conductor
or ground terminal to prevent accidents caused by electric leakage.
•Do not connect the earth wire to gas or water pipes. If not, fire disaster may be caused.
•Do not connect the earth wire to the ground for telephone wire or lightning conductor. If not,
fire disaster or electric shock may be caused.
•Do not use a branching receptacle, which may cause the heat generation.
2. Choose a proper place for installation
•Do not install this unit in a place where:
♦Rough or dirty surface.
♦Flammable gas or corrosive gas is generated.
♦Ambient temperature exceeds 35°C.
♦Ambient temperature fluctuates violently.
♦There is direct sunlight.
♦There is excessive humidity and dust.
♦There is a constant vibration.
•Install this unit on a stable place with the space as shown below.
The exhausted opening is provided at the top surface of unit for DKN302, DKN402, DKN602
and DKN612 types, and at the back surface for DKN812 and DKN912 types.
Main Unit
More than
15cm
More than
15cm
More than 30cm
Front side

5
Before Using this unit
Requirements for Installation
3. Do not use this unit in an area where there is flammable or explosive gas
(Refer to page 45 "List of Dangerous Substances".)
•Never use this unit in an area where
there is flammable or explosive gas.
This unit is not explosion-proof. An
arc may be generated when the
power switch is turned ON or OFF,
and fire/explosion may result.

•Never use explosive substances,
flammable substances and
substances that include explosive or
flammable ingredients in this unit.
Explosion or fire may occur.
Flammable
substance

6
Before Using this unit
Requirements for Installation
4. Do not modify 5. Installation on horizontal surface
•Modification of this unit is strictly
prohibited. This could cause a failure. •Set this unit to the flattest place. Setting
this unit on rough or slope place could
cause the vibration or noise, or cause the
unexpectible trouble or malfunction.
CAUTION!
6. Do not make an overload 7. Do not set samples in close formation
•The withstand load of shelf is 15kg
（uniform load）Set the samples apart
each other.
•The temperature in furnace cannot be
controlled if too much samples are set
there. Make sure to use the shelf and
set samples apart each other so as to
make the free space of 30% or more to
the furnace to acquire accuracy of
temperature.
Make the free space of 30% or more
Do not modify To the flattest place
Samples
Shelf
15Kg

7
Before Using this unit
Requirements for Installation
8. Choose a correct power distribution board or receptacle
•Choose a correct power distribution board or receptacle that meets the unit’s rated electric
capacity.
Electric capacity: DKN302: 100V AC, 8.5A
DKN402: 100V AC, 12.5A
DKN602: 100V AC, 14A
DKN612: 1φ200V AC, 8A
DKN812: 1φ200V AC, 12.5A
DKN912: 1φ200V AC, 15.5A
NOTE)
There could be the case that the unit does not run even after turning ON the power. Inspect
whether the voltage of the main power is lowered than the specified value, or whether other
device(s) uses the same power line of this unit. If the phenomena might be found, change the
power line of this unit to the other power line. Please consult your dealer or a local electrical
contractor for the connection of devices that use a single-phase 200V power source.
9. Before/after installing
•It may cause injure to a person if this unit falls down or moves by the earthquake and the
impact. etc..To prevent, take measures that the unit cannot fall down, and not install to busy
place.
•Touching the unit may cause a burn during and just after the operation. To prevent, take
measures that putting up a notice of operating etc..
•Make sure to lock the caster for DKN812and DKN912 types.
10. Setting of the shelf and sample
•D The number of shelves attached varies depending on the type of product (2 to 8).One of
them (two for DKN912 ) is previously fixed on the lowermost stand of bracket supporter with
screws at factory shipment. Set the other shelves in place in furnace as necessary.
•One of the shelves is fixed on the lowermost stand of bracket supporter with screws at factory
shipment.The temperature of current plate and its adjacence is usually higher than the setting
temperature because a heater is provided under it, which may cause burn of sample or fire
disaster if a sample is directly put on the current plate. To prevent such accidents, the shelf
is fixed with screws as shown in the figure. Be sure to provide sufficient space between the
current plate and sample in case the shelf must be removed due to the shape of sample. Do
not put the sample directly on the current plate.
Never use explosive substances,
flammable substances and
substances that include explosive
or flammable ingredients in this
Bracket supporter
Bracket
M4 screw
Shelf
Current plate

8
Before Using this unit
Requirements for Installation
11. Handling of power code
•Do not entangle the power cord. This will cause overheating and possibly a fire.
•Do not bend or twist the power cord, or apply excessive tension to it. This may cause a fire
and electrical shock.
•Do not lay the power cord under a desk or chair, and do not allow it to be pinched in order to
prevent it from being damaged and to avoid a fire or electrical shock.
•Keep the power cord away from any heating equipment such as a room heater. The cord's
insulation may melt and cause a fire or electrical shock.
•If the power cord becomes damaged (wiring exposed, breakage, etc.), immediately turn off the
power at the rear of this unit and shut off the main supply power. Then contact your nearest
dealer for replacement of the power cord. Leaving it may cause a fire or electrical shock.
•Connect the power plug to the receptacle which is supplied appropriate power and voltage.

9
Description and Function of Each Part
Main Unit
DKN302/402/602/612
DKN612のみ
Front view
Rear view
Main switch
(Earth leakage breaker)
Door
Door handle
Production plate
Control panel
Power cord
Exhausted opening
Cable port
Glass window

10
Description and Function of Each Part
Main Unit
DKN812
Door
Front view
Rear view
Main switch
(breaker)
Door handle
Production plate
Control panel
Power cord
Exhausted opening
Caster
Cable port

11
Description and Function of Each Part
Main Unit
DKN912
Door
Front view
Rear view
Main switch
(Earth leakage breaker)
Door handle
Production plate
Control panel
Power cord
Exhausted opening
Caster
Cable port

12
Description and Function of Each Part
Control Panel
POWER
①START/STOP Key：Starts/stops the operation.
②▲▼ Key：Uses for rising UP/lowering DOWN the setting value.
③ENTER Key：Settles the inputted value.
④FIXED TEMP Key：Chooses the fixed temperature operation.
⑤TIMER Key：Chooses the timer operation (Quick Auto Stop/Auto Stop/Auto
Start).
⑥PROGRAM Key：Chooses the program operation or program creation mode.
⑦SUBMENU Key：Uses for setting the overheating prevention temperature,
calibration offset temperature, key lock function, or program
repeat function.
⑧HEATER Lamp：Lights while the heater works.
⑨ALARM Lamp：Lights up when an error occurs. (Buzzer sounds simultaneously.)
⑩AUTO STOP Lamp：Blinks while setting quick auto stop timer or auto stop timer.
Lights while quick auto stop timer or auto stop timer is running.
⑪AUTO START Lamp：Blinks while setting auto start timer.
Lights while auto start timer is running.
⑫FIXED TEMP Lamp：Blinks while setting fixed temperature operation.
Lights while fixed temperature operation is running.
⑬PROGRAM Lamp：Blinks while setting program operation.
Lights while program operation is running.
⑭Measurement Temperature
Display：Displays the measured temperature, setting character, alarm
information.
⑮Setting Temperature
Display：Displays the setting temperature, setting value for timer mode,
remaining time.
⑯Overheating Prevention
Temperature Display：Displays the setting temperature for overheating prevention
device.
⑰Power Switch：
(Earth leakage breaker) Turns ON/OFF the main power.
⑱Electric leak testing button：Checks the breaker’s condition.
⑧
⑨
⑩
⑪
⑫
⑬
③
②
④
⑤⑦ ⑥
①
⑯
⑮
⑭
⑰
⑱

13
Description and Function of Each Part
Characters of the Controller
The characters VS4 controller shows are as follows:
Character Identifier Name Purpose
FiX Fixed Temperature
Setting Mode Used for starting the fixed temperature
operation.
Sv Temperature Setting Used for setting the temperature.
AStP Timer Setting Mode
Display Represents the setting of quick auto stop or
auto stop operation.
AStr Timer Setting Mode
Display Represents the setting of auto start
operation.
tim Time Setting Used for setting the time.
PrG3 Program Type Used for choosing program type from 1 to 3.
(Refer to Page 24 " Program Operation".)
PAt Program Pattern Used for choosing program pattern. (Refer to
Page 24 " Program Operation".)
End Time Up
Displays when the timer operation is
completed or while inputting number of
program steps. (Refer to Page 24 " Program
Operation".)
Sv-1 Program Temperature
Setting Used for setting the temperature for each
step in the program. (Sv-1 to Sv-30 is
shown.)
t-1 Program Time Setting Used for setting the time for each step in the
program. (t-1 to t-30 is shown.)
PS-3 Step Number to be
Repeated
Used for choosing the step number to be
repeated under the program operation with
repeat function. (Refer to Page 28 " Use
program repeat function".)
Pc-2 Repeating Times
Used for setting the repeating times under
the program operation with repeat function.
(Refer to Page 28 " Use program repeat
function".)
cAL Calibration Offset
Setting Used for inputting the calibration offset
temperature. (Refer to Page 31 "Other
Function".)
oH Overheating Prevention
Setting Used for setting temperature for overheating
prevention device. (Refer to Page 17 "Setting
of Overheating Prevention Device ".)
LocK Key Lock Locks the keys on control panel to protect
from unnecessary operation. (Refer to Page
31 "Other Function".)
* Also refer to Page 16 "Operation Mode, Function Setting Key, and Characters".

14
Operation Method
Operation Mode and Function List
All the operation mode of this unit is as follows;
No. Name Description Page
1. Fixed Temperature
Operation
Pressing the FIXED TEMP key enters into the fixed
temperature operation setting mode.
Pressing it again enters into the temperature setting mode.
The "▲▼" are used to set temperature.
Pressing the START/STOP key starts or stops operation.
18
2. Quick Auto Stop
Operation
This operation is used to specify the period up to automatic
stop during operation.
The period up to operation stop can be set by pressing the
TIMER key during fixed temperature operation.
The "▲▼" are used to set the time.
Pressing the START key starts the quick auto stop
operation, activates the timer function and stops the
operation automatically after specified period.
19
3. Auto Stop Operation
This operation is used to specify the automatic stop time in
the fixed temperature operation.
Pressing the TIMER key displays "ASｔp".
The setting temperature "SV" can be set by pressing the
ENTER key.
The operation time "tim" can be set by pressing it again.
Pressing the START/STOP key starts the auto stop
operation.
20
4. Auto Start Operation
This operation is used to specify the period up to automatic
start after power on.
Pressing the TIMER key displays "ASｔr".
The setting temperature "SV" can be set by pressing the
ENTER key.
The operation time "tim" can be set by pressing it again.
Pressing the START/STOP key starts the auto start
operation.
22
5. Program Operation
This operation is used to change the temperature according
to the setting temperature and time.
Pressing the PROGRAM key displays "PrG1".
Press it again to select the program mode.
Press the ENTER key to select the pattern "PA t".Press the
ENTER key to display "End". Input the number of
patterns to be used.
Input the temperature and time of patterns "SV-n" and "t-n"
respectively.
24
NOTE) This unit is impossible to be changed the mode during the operation. If the mode requires to be
changed, stop the operation.

15
Operation Method
Operation Mode and Function List
The operation function of this unit is as follows;
No. Name Description Page
Auto overheating
prevention function
This function is set to be automatically activated
(auto reset) when the temperature exceeds the
setting temperature by 12℃.
1. Overheating prevention
function Overheating
prevention device
Though the device shares power source, display,
and key input with the controller, it has
independent temperature measurement circuit,
CPU, sensor and output circuit. Overheating
prevention temperature can be set using the
operation panel.
The unit stops operation when the device is
activated. The unit starts operation again when
the POWER switch is pressed again (manual
reset).
17
2. Calibration offset function
This calibration offset function is for calibrating
the difference occurred between the required in-
furnace temperature and control temperature
(sensor temperature) of the controller. This unit
can be calibrated toward either plus side or minus
side of the whole temperature range.
31
3. Overheating prevention temperature calibration
function
The temperature of overheating prevention device
is automatically corrected when the temperature
of controller is collected. -
4. Recovery at power failure
The unit starts operation with the same condition
as just before power failure if it occurs during
operation. Press the START/STOP key to start
the unit again.
-
5. Setting value locking
This function locks the established operation
status.
It can be set and cancelled with the SUBMENU
key.
31

16
Operation Method
Operation Mode, Function Setting Key, and Characters
The operation mode setting and function setting use the key operation and characters show in
the following figure.