Belmont Quolis Q5500 User manual

Quolis Chair (Model Q5500)
INSTRUCTIONS FOR USE

2
Dear Customers
For easy access to the information contained herein, keep this booklet
at hand and review it as needed.
Ask your local authorized Belmont dealer to install this product by
following the installation instructions contained with this product.
If you have any questions regarding the operating instructions or this
product, contact your local authorized Belmont dealer.
If you need a new operating instructions booklet, please request the
REF number indicated below to your local authorized Belmont dealer
or print manual from our website.
This booklet explains how to use the Quolis Chair (Model Q5500).
Before using the Quolis Chair (Model Q5500), carefully read the
operating instructions and make sure to use the product correctly.
Using the product without reading these instructions may lead to an
accident.
Dear Customers
Thank you for purchasing our product.
2022-01 (1st version)
1E08ANAE
REF
This document describes the full version of the system. It may
therefore cover components that are not included in the
system you purchased.

3
Table of Contents
1 General Information
1-1 Intended Use of the Product ....................................................................... 5
1-2 How to Dispose of the Device ..................................................................... 5
1-3 Technical Description .................................................................................. 5
1-4 Symbols ...................................................................................................... 6
2 Safety Consideration
3 Precautions for Use
4 Product Specifications
2-1 Risk Level Interpretation .............................................................................. 7
2-2 Safety Precautions ...................................................................................... 9
Important points to remember when operating the product ...................... 15
2-3 EMC Information ...................................................................................... 16
3-1 Operating Precautions .............................................................................. 20
3-2 Precautions for Upholstery ........................................................................ 21
4-1 Technical Data ..........................................................................................22
4-2 Name of Each Part ....................................................................................23
Dear Customers ................................................................................................2
5 Operation
5-1 Preparation Before Use ............................................................................. 24
5-2 Operating the switchs ............................................................................... 26
5-3 Rotating the Seat ...................................................................................... 29
5-4 Adjustingthe headrest position ................................................................ 30
5-5 Rotating the armrests for patient entry/exit ................................................ 31
5-6 Safety Switch function ............................................................................... 31
6 Maintenance and Cleaning
6-1 Cleaning and disinfection .......................................................................... 32
6-2 Maintenance and inspection ..................................................................... 34
6-3 Environmental Conditions for Transportation or Packaging ........................ 36
6-4 Storage method ........................................................................................ 36

4
Table of Contents
8 Maintenance by Service Engineers
8-1 After-sales service ..................................................................................... 38
8-2 Service life ................................................................................................. 38
8-3 Period of Parts Retention .......................................................................... 38
7 Troubleshooting
7-1 Troubleshooting ........................................................................................ 37
9 Accessories and Consumables
9-1 Accessories .............................................................................................. 39
9-2 Consumables ........................................................................................... 39

5
1 General Information
This product is an active therapeutic device intended for the exclusive
use for diagnoses, treatments and relative procedures of dentistry.
The product must be operated or handled by the qualified dentists or
by dental staffs under the supervision of the dentist.
Such dentists or dental staffs should instruct and/or assist the
patients to approach to and leave from the product.
Patients should not be allowed to operate or handle the product
unless he/she is so instructed.
1-1 Intended Use of the Product
When disposing of this product and parts replaced, carefully take
infection control measures and handle them properly in accordance
with the relevant laws and regulations (applicable regulations and local
regulations).
1-2 How to Dispose of the Device
1-3 Technical Description
The following are explained in the documents listed below:
How to install this product
Wiring/plumbing
Item Document
Installation instructions
Installation instructions

1 General Information
The symbols listed below are used on this product and labels as well
as in this booklet. Check the meaning of each symbol.
1-4 Symbols
Switch for lowering the
chair
Switch for reclining the
backrest
Switch for manual
operation
Switch for raising the
backrest
Switch for raising the
chair
Automatic return switch
Preset switch 1
Preset switch 3
Preset switch 2
Switch
（ＯＦＦ）
Switch
（ＯＮ）
Protective earthing
Caution
General warning sign
Name and address
of the manufacturer
Alternating current
Year of manufacture
Catalog number
Follow
instructions for use
Type B Applied Parts
contacting the
patient’s body
surface only
Generally prohibited
activity
Disassembly, repair
or modification
prohibited
Instructions for
mandatory actions
in general
Indicates that the
power plug must be
removed from the
power outlet
6
Swivel lock release
switch
Lock release switch

2 Safety Consideration
These precautions are intended to ensure the safe use of the product
and prevent harm or damage to users or other people.
According to the magnitude of harm and damage and the
degree of urgency, an incident that may be caused by misuse of the
product is classified into one of the following categories: CONTRAIN-
DICATION, WARNING, and CAUTION.
All of these categories are important for safety. Always follow the
instructions provided.
We assume no responsibility for any accident due to failure to follow
the Safety Precautions or Operating Precautions even in the event of
harm or damage to users or other persons.
Users or other persons who use the product without observing the
Safety Precautions and Operating Precautions are responsible for any
harm or damage incurred.
The graphical symbols used in these instructions are explained in
detail below.
Once you have fully understood these explanations, follow the
operating instructions in this booklet.
Make sure to carefully read the Safety Precautions and Operating
Precautions and use the product correctly.
Precautions before use
2-1 Risk Level Interpretation
7

8
2 Safety Consideration
Improper handling of the product without regard to this
indication will create a hazardous condition that may result in
death or serious injury.
Improper handling of the product without regard to this
indication will create a potentially hazardous condition that
may result in moderate or slight injury or property damage.
Use of the product without regard to this indication will create
a hazardous condition that may result in death or serious
injury.
Classification by degree of
harm or damage and urgency
The following graphical symbols are used to explain your
responsibilities for using the product safely:
Generally prohibited activity
Disassembly, repair or modification prohibited
Instructions for mandatory actions
Graphical symbols for prohibited activity
Graphical symbols for mandatory instructions
CONTRAINDICATION
WARNING
CAUTION
Indicates that the power plug must be
removed from the power outlet.

2 Safety Consideration
Precautions regarding installation
Do not install the product near electromagnetic emission sources
such as communication facilities or elevators.
Malfunction of this product may occur when operated in the presence
of electromagnetic interference waves.
Installing or transferring the
product
Use and maintenance of the
product
Do not use the product for any purposes other than dental
diagnosis and treatment.
This product is designed for dental diagnosis and treatment.
This product must only be operated by dentists or dental staff
performing dental procedures.
Do not use the equipment in an explosive atmosphere (e.g.,
in the presence of inflammable gases).
Improper use in such an atmosphere may cause injury or fire.
Do not use in the presence of electromagnetic waves.
Do not use equipment generating electromagnetic waves,
such as mobile phones, around this product.
Malfunction of this product may occur.
Be sure to turn off the power switch of the product when HF
surgical equipment is in use.
Be sure to turn off the power switch when HF surgical equipment is in
use because the noise generated from HF surgical equipment may
cause incorrect operation of this product.
Never disassemble, repair or modify the product.
Individuals other than your local authorized Belmont dealer should not
disassemble or repair this product.
Failure to adhere to this requirement could lead to injury, product
failure, electric shock, or fire.
In no case may this product be modified in any way.
CONTRAINDICATION
2-2 Safety Precautions
9

10
2 Safety Consideration
Precautions for installation
Ask your local authorized Belmont dealer to install the product.
Make sure to place the product on a firm and flat floor.
Placing the equipment on a non-flat floor may cause it to fall.
Be sure product is plugged into an electrically grounded power outlet
(ask a professional to ground the product).
Failure or electric leak may result in electric shock.
To avoid the risk of electric shock, this equipment must only be
connected to a supply mains with protective earth (ground).
Place no obstacles adjacent to the power outlet wich could impede
easy access by the power plug.
Do not connect the earth (ground) to the following objects.
Water pipes
(Complete grounding is not possible as hard plastic pipes are widely
used.)
Gas pipes
(Can result in an explosion or fire)
Lightning rods and telephone dedicated grounding wire
(Dangerous during lightning)
Do not touch the power plug or power outlet with wet hands.
Failure to do so can result in electric shock.
Use a single power outlet (do not share a power outlet with
other plugs).
Use an unshared power outlet with an attached ground terminal.
Using the same power outlet together with the power plug of other
devices can result in abnormal heat generation and possible fire.
Firmly insert the power plug into the power outlet.
Be sure to fully insert the power plug into the power outlet until
reaching the base of the plug.
Failure to fully insert the plug or similar fault can result in a short circuit
or heat generation that causes a fire.
Wipe off the dirt on power plug and power outletwith a dry
cloth to avoid any possible fire.
Hold by the power plug when unplugging.
Do not pull the cord to remove the power plug from the power outlet .
Hold the power plug at the end of the cord when removing. Removing
the plug by pulling the power cord can damage the power cord,
resulting in electric shock or fire.
Power Plug and Cord
Installing or transferring
the product
WARNING

11
2 Safety Consideration
Use care when handling the power cord.
Damaging the cord can result in electric shock or fire.
Do not damage the cord.
Do not place objects on top of the cord.
Do not alter the cord.
Do not heat the cord.
Do not excessively bend, twist, or pull the cord.
Do not use damaged cord or plug.
Do not use any power cord or plug that is damaged, or that fits
loosely when inserted into a power outlet. Doing so can result in
electric
shock or fire.
Unplug the power plug when the chair is not in use.
Turn off the power switch and remove the power plug from the power
outlet when the chair is not in use. Unexpected operation can result in
an accident or fire from a short circuit due to insulation aging.
The patient should
clasp his/her hands.
The patient should
place his/her feet
side by side.
Use and maintenance
of the product
Perform cleaning before using the product for the first time.
This product is not sterilized or disinfected when shipped.
Do not wash the product with water.
This may cause failure or electric shock.
Points to remember when a patient sits on the chair
As shown in the figure on the left, instruct the patient to sit on the
chair and make sure his/her body fits on the chair.
Ensure that the patient maintains the posture shown in the left figure
before operating the chair.
For a young child, the buttocks should be placed on the seat when
raising the backrest.
Power Plug and Cord
WARNING

12
2 Safety Consideration
Use and maintenance
of the product
Pay attention to patients and children.
Keep your eyes on the patient when this product is in use.
Patients (especially children) may touch the control switch or system
inadvertently, leading to an injury or product damage.
Keep children away from this product except when providing
treatment.
The patient must not sit on the edge of the seat.
The chair may tip over or move unexpectedly, causing injury or
damage to product and peripheral devices.
Pay close attention to patients who have a cardiac
pacemaker or defibrillator implanted.
If any patient complaint or abnormality is observed, immediately turn
off the power switch and discontinue use of the product.
The product may affect the function of the pacemaker or defibrillator,
leading to an accident.
Precautions for patient seating and exiting from the product
When the patient gets on or off the chair, the chair should always be
at the lowest position and all operations must be locked by the lock
switch.
Before moving a patient from a wheelchair to the product or vice
versa, ensure that no obstacles (e.g., foot switch) are situated around
the wheelchair, the patient or the caregiver.
Obstacles present a potential tripping hazard and may cause injury or
damage to peripheral devices.
When the patient is moved from a wheelchair to the product or vice
versa, he/she must be carefully assisted or monitored to prevent
falling.
If the patient has to get off the product at a position other than the
designated position for getting on and off the product due to power
failure or in the event of an emergency, he/she must be carefully
monitored to prevent falling.
Remove the patient’s glasses and any accessories
(such as a necklace or bracelets) before treatment.
Failure to follow this instruction may hamper treatment and lead to an
accident and injury.
Precautions when raising/lowering the backrest
Before lowering the backrest, ensure that the patient’s arm or hand is
not sandwiched between the backrest and the seat.
Before raising the backrest, ensure that the patient’s arm or hand is
not sandwiched between the backrest and the armrest.
WARNING

13
2 Safety Consideration
Use and maintenance
of the product
Precautions for operating the chair
Before and during the chair operation, pay close attention to the
operation range (seat raising/lowering, backrest raising/reclining,and
seat rotation), and ensure that the chair does not contact any body
parts, hands or feet, or obstacles. Body parts, hands or feet, or
objects may become caught in the chair, causing injury.
Before operating the chair, ensure that the patient is seated in the
correct position, and keep your eyes on him/her when the chair is in
use.
California Proposition 65
Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
Discontinue use of the product if it is broken or damaged.
In the case of a broken or damaged product, immediately discontinue
use and turn off the power switch. Then, contact your local authorized
Belmont dealer to repair the product.
Precautions during seat rotation
Make sure that no persons or objects are nearby before slowly
rotating the seat.
Be careful of the patient when the backrest is reclined and check that
the safety of the patient is ensured before rotating the chair.
After rotating the seat, be sure that the seat safely locks into position.
Always be sure that rotation is locked before operating the product.
Accidental rotation of the product can result in injuries or damage to
nearby equipment or cabinetry in the treatment room.
Prohibition of using this equipment adjacent to or stacked
with other electronic equipment
Use of this equipment adjacent to or stacked with other equipment
should be avoided because it could result in improper operation.If
such use is necessary,this equipment and the other equipment should
be observed to verify that they are operating normally.
Prohibition of placing portable RF communications
equipment adjacent to this product
Portable RF communications equipment (including peripherals such
as antenna cablesand external antennas) should be used no closer
than 30 cm(12 inches) to any part of Quolis chair (Model Q5500),
including cables specified by the manufacturer.Otherwise,
degradation of the performance of this equipment could result.
Turn off the power switch and unplug the power plug before
cleaning.
Failure to do so can result in injury, electric shock or fire.
WARNING

14
2 Safety Consideration
Use and maintenance
of the product
Clean the product thoroughly.
Poor cleaning may cause bacteria to grow, posing a health risk.
See cleaning procedures on pages 32 to 33.
Be sure to conduct routine maintenance.
Use of the product without routine maintenance may cause injury or
damage to the product.
See maintenance information on pages 34 to 35.
Procedures if a power outage occurs
Turn off the power switch. Remove the power plug of the product
from the power outlet to prevent unexpected operation when power
is restored.
Use and maintenance
of the product
Do not allow a person who exceeds 440lbs (200kg) to sit on
the chair.
Injury or product failure may occur.
Do not hit or rub against the product.
This may cause damage to the covers or operational failure.
Ensure that each part operates normally, with no
abnormalities detected, each time before product operation.
Always inspect the product for abnormal findings such as loose
components, backlash, tilting, vibration, sound, abnormal
temperature, or bad odors.
If you feel something is wrong, immediately discontinue use of the
product and turn off the power switch. Contact your local authorized
Belmont dealer for service.
Read the accompanying documents for this product.
Before use, make sure to carefully read the instructions for use
supplied with this product and use the device correctly.
Be sure to operate switches manually.
Make sure to operate the switches manually, except for the foot
switch operated by the foot. Failure to operate the switches by hand
may cause damage or malfunction.
Carefully operate the switches.
The operator should pay close attention to people on and around the
product before operating switches.
Precautions when using the headrest
During the headrest positioning, ensure that fingers do not become
caught or sandwiched between the headrest mechanism parts and
the backrest.
CAUTION
WARNING

2 Safety Consideration
Use and maintenance
of the product
Use caution to prevent tripping over the power cord.
Failure to do so can result in injury.
Immediately wipe off any drug solutions or water spills onto
the product.
Drug solutions or water spilled onto product control surfaces may
lead to operational failure, electrical shorts If drug solutions or water
are adhered, immediately turn off the power switch and wipe them off
with a dry, soft cloth.
Precautions for cleaning procedures
The metal parts and mechanical parts of the chair mayhave sharp
edges. Be careful when cleaning the chair that your hands, fingers or
other body parts are not injured.
Turn off the power switch at the end of each day or during a
break.
Turning off power supply protects the product from potential damage
and users from potential injury.
CAUTION
Meaning of a symbol
Point to remember (locations requiring attention including
moving parts, rotating parts, and detachable parts)
Point to remember where an emergency stop mechanism
is available
Meanings of each point to remember
Important points to remember when operating
the product
①⑥
② ④③⑤
①Take care to prevent body parts or objects from becoming caught in
the armrest (when rotating).
Do not operate the chair when the armrest is rotated outward.
②Take care to prevent body parts or objects from becoming caught in
the armrest (when lowering the chair).
Do not place the body parts or objects at the armrerst bracket when loweringthe
chair.
③Take care to prevent body parts or objects from becoming caught in
the backrest moving parts.
Do not sandwich your hands or feet between the backrest and the seat.
④Take care to prevent body parts or objects from becoming caught
underneath the bottom of the seat.
Do not place your hands or feet in the bottom of the seat.
⑤Take care to prevent body parts or objects from becoming caught
underneath the rear link cover .
Do not place the body parts or objects between the rear link cover and base plate.
⑥Take care to prevent body parts or objects from becoming caught in
the headrest moving parts.
Ensure that your fingers and hair do not become caught in the headrest moving part.
⑦Take care when raising or reclining the backrest to prevent contact with
cabinetry surfaces and nearby equipment.
Before operating the backrest, ensure that no obstacles are placed around the
backrest.
⑦
15

16
2 Safety Consideration
2-3 EMC Information
This product complies with EMC Standard IEC60601-1-2:2014.
1. Precautions regarding EMC and compliance with
accompanying documents
Medical electrical equipment requires special precautions
regarding EMC and needs to be installed and put into service
according to the EMC information provided in this booklet.
2. Effects of RF communication devices
Portable and mobile RF communication devices can affect
medical electrical equipment.
3. Installation exclusion environment
Hospitals except for near active HF SURGICAL
EQUIPMENT and the RF shielded room of an ME SYSTEM
for magnetic resonance imaging,where the intensity of EM
DISTURBANCES is high.
4. Electromagnetic emission declaration
Group 1
Emissions test Compliance Electromagnetic environment—guidance
Class B
Not
applicable
Guidance and manufacturer’s declaration—electromagnetic emissions
Quolis Chair (Model Q5500) is intended for use in the electromagnetic environment
specified below. The customer or user of Quolis Chair (Model Q5500) should ensure
that it is used in such an environment.
Quolis Chair (Model Q5500) only uses RF
energy for its internal functions.Therefore, its
RF emissions are very low and are not likely to
cause any interference with nearby electronic
equipment.
Quolis Chair (Model Q5500) is suitable for use
in all establishments, including domestic
establishments and those directly connected
to the public low-voltage power supply
network that supplies buildings used for
domestic purposes.
RF emissions
CISPR 11
RF emissions
CISPR 11
Harmonic current
emissions
IEC 61000-3-2
Voltage fluctuations/
Flicker emissions
IEC 61000-3-3
Not
applicable
Use of this equipment adjacent to or stacked with other equipment
should be avoided because it could result in improper operation.
If such use is necessary,this equipment and the other equipment
should be observed to verify that they are operating normally.
WARNING

17
2 Safety Consideration
Electromagnetic environment
—guidance
Immunity test
Quolis Chair (Model Q5500) is intended for use in the electromagnetic environment
specified below. The customer or user of Quolis Chair (Model Q5500) should ensure
that it is used in such an environment.
Note UT is the AC mains voltage prior to the application of the test level.
Flooring should be wood,
concrete, or ceramic tiles.
If the floor is covered with
synthetic material, the relative
humidity should be at least
30%.
Electrostatic
discharge (ESD)
IEC 61000-4-2
Electrical fast
transient/burst
IEC 61000-4-4
Power frequency
(50/60 Hz)
magnetic field
IEC 61000-4-8
Surge
IEC 61000-4-5
Voltage dips,
short interruptions
and voltage
variations on power
supply input lines
IEC 61000-4-11
±8 kV contact
±15 kV air
30A/m 30A/m
±2 kV for
power supply lines
±1 kV for
input/output lines
±1kV
differential mode
±2kV
common mode
The mains power quality should
be that of a typical commercial
or hospital environment.
0% UT
; 0.5 cycles
0°,45°,90°,135°,
180°, 225°, 270°
and 315°
0% UT
; 1cycle and
70% UT
; 25/30 cycles
at 0°, single phase
0%UT
; 250/300 cycles
The mains power quality should
be that of a typical commercial
or hospital environment. If the
user of Quolis Chair (Model
Q5500) requires continued
operation during mains power
interruptions, it is recommended
that Quolis Chair (Model Q5500)
be powered from an
uninterruptible power supply or
a battery.
Power frequency magnetic fields
should be at levels characteristic
of a typical location in a typical
commercial or hospital
environment.
5. Electromagnetic immunity declaration 1
Guidance and manufacturer’s declaration—electromagnetic immunity
IEC 60601
test level Compliance level
±8 kV contact
±15 kV air
±2 kV for
power supply lines
±1 kV for
input/output lines
The mains power quality should
be that of a typical commercial
or hospital environment.
±1kV
differential mode
±2kV
common mode
0% UT
; 0.5 cycles
0°,45°,90°,135°,
180°, 225°, 270°
and 315°
0% UT
; 1cycle and
70% UT
; 25/30 cycles
at 0°, single phase
0%UT
; 250/300 cycles

18
2 Safety Consideration
6. Electromagnetic immunity declaration 2
7. Essential performance
Unless operated by the chair control switch, the chair will not make
any movements except for sounding a buzzer and switching the
indicator on/off.
Loss or decline of essential performance may cause the chair to move
unexpectedly, causing harm or damage to the patient, the operator or
people or objects around the patient or the operator.
Electromagnetic environment
—guidance
Immunity test
Quolis Chair (Model Q5500) is intended for use in the electromagnetic environment
specified below. The customer or user of Quolis Chair (Model Q5500) should ensure
that it is used in such an environment.
Guidance and manufacturer’s declaration—electromagnetic immunity
IEC 60601
test level Compliance level
Conducted RF
IEC 61000-4-6
3V
0.15MHz-80MHz
6V
0.15MHz-80MHz
in ISM bands
and amateur
radio bands
Radiated RF
IEC 61000-4-3
3V/m
80MHz-2.7GHz
80% AM (1 kHz)
3V/m
80MHz-2.7GHz
80% AM (1 kHz)
Near electromagnetic
field caused by RF
wireless communication
devices
IEC61000-4-3
See the table
on the next page
(page 19)
Warning:
Portable RF communications
equipment (including peripherals
such as antenna cables and
external antennas) should be
used no closer than 30 cm
(12 inches) to any part of
Quolis Chair (Model Q5500),including
cables specified by the manufacturer.
Otherwise,degradation of the
performance of this equipment
could result.
3V
0.15MHz-80MHz
6V
0.15MHz-80MHz
in ISM bands
and amateur
radio bands
See the table
on the next page
(page 19)
Portable RF communications equipment (including peripherals
such as antenna cables and external antennas) should be used
no closer than 30 cm(12 inches) to any part of this product, including
cables specified by the manufacturer.
Otherwise,degradation of the performance of this equipment
could result.
WARNING

19
2 Safety Consideration
Near electromagnetic field caused by RF wireless
communication devices
Test frequency
(MHz)
Modulation IEC 60601
test level IEC 60601
compliance level
385
450
710
745
780
2450
810
870
930
1720
1845
1970
5240
5500
5785
Note a)
Pulse modulationa)
18Hz
Frequency
modulation
±5kHz shift
1kHz sine wave
Pulse modulationa)
217Hz
The carrier is modulated by a square wave
with a 50% duty cycle.
27V/m
28V/m
9V/m
28V/m
28V/m
28V/m
9V/m
27V/m
28V/m
9V/m
28V/m
28V/m
28V/m
9V/m
Pulse modulationa)
217Hz
Pulse modulationa)
18Hz
Pulse modulationa)
217Hz
Pulse modulationa)
217Hz

20
Immediately wipe off any drug solutions spilled onto the
product.
Otherwise, they may cause deterioration or discoloration.
Do not apply heat to the product.
This may cause deterioration or discoloration.
Discoloration of plastic materials.
Plastic materials are used in external components of the product.
Carefully selected materials are used; however, discoloration may
occur for reasons such as natural deterioration or the spilling of drug
solutions.
To ensure use ofthe product for as long as possible, immediately
wipe off any drug solutions spilled and avoid sunlight.
Other than patients, do not place objects on the seat.
This may cause deformation, tears, or corrosion of the leather.
Patient weight limit[440 lbs (200 kg)].
The seat may rise slowly if a person weighs close to the chair lift
capacity limit.
Shockless Mechanism
This product is equipped with a shockless mechanism, that allows
smooth starting/stopping chair movement.
This mechanism reduces chair vibrations, enabling smooth chair
operation.
To utilize this mechanism, pay attention to the following precaution;
●Chair Preheating Function
Due to the product's hydraulic system and shockless mechanism, the
chair stopping position may slightly vary depending on the oil
temperature and patient weight.
The oil temperature will drop especially during winter season in the
mornings,creating a scatter in the chair stopping position.
When the oil temperature significantly drops, the chair preheating
function will operate for 3 minutes immediately after the product's
main switch is turned on.
The warning sound will beep during this operation.
To cancel the chair preheating function, press any manual chair
movement switch or preset switch.
3-1 Operating Precautions
3 Precautions for Use