TLV SteamAqua SQ-C01 User manual

172-65702M-04 (SQ-C01) 10 December 2020
Steam-Fired Instantaneous Water Heater
SQ-C01
Copyright © 2020 by TLV CO., LTD
All rights reserved

172-65702M-04 (SQ-C01) 10 Dec 2020
1
Introduction
Thank you for purchasing the TLV steam-fired instantaneous water heater,
SteamAqua SQ-C01 (hereafter referred to as "the unit"). The unit is certified by JET
(Japan Electrical Safety & Environment Technology Laboratories) as a water supply
instrument based on the Water Supply Act (in Japan).
The SQ-C01 produces hot water by heating water using steam as a heat source.
The unit does not require electrical wiring and can be used by installing steam and
water piping. However, incorrect handling may cause an unexpected accident. Follow
the instructions to be sure of using the unit properly.
Be sure to read the Instruction Manual and Installation/Piping Installation Procedures
before installing the unit.
Be sure to read the Instruction Manual and "Operational Check/Cleaning Guide"
packed with the unit when carrying out daily operation, maintenance and
troubleshooting.
Be sure to read the Instruction Manual and Maintenance Procedures packed with the
unit before carrying out maintenance and repair work.
Please keep it in a safe place for future reference.
The copyright of this manual belongs to TLV CO., LTD. Unauthorized reproduction of
the contents of this manual in part or in whole is strictly prohibited.
This manual should be kept for future reference. If it becomes defaced or is
misplaced, contact your local TLV representative, or download from the TLV website
(https://www.tlv.com). Membership registration (free of charge) is required to
download the instruction manual.
The contents of this manual are subject to change without notice.
Please note that visuals such as the diagrams and illustrations found within this
manual may differ slightly from the actual unit.
This manual was written for the purpose of use of the unit in the Japanese market.
When the unit is operated by non-Japanese speaking personnel, translate the
instruction manual in their language, explain the contents and implement safety
training before work.
Please carefully read all other documentation included for this unit and its
components.
Make sure that the person supervising operation of the unit has received a thorough
briefing on the contents of the 'Report on Commissioning Results' which is issued
after finishing the commissioning.
Important Notice

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Contents
Introduction····························································· 1
Safety Considerations··············································· 3
Precautions for Opening the Package ·························· 7
Precautions for Moving the Package···························· 8
Configuration (Component Name and Function)············· 9
Options·································································11
Considerations for Installation Personnel ·····················12
Precautions before Unit and Piping Installation ·············14
Piping Work ···························································16
Commissioning·······················································21
Operation ······························································24
Prevention of Damage due to Freezing························27
Maintenance and Inspection······································28
Cleaning································································30
Maintenance ··························································31
Troubleshooting······················································37
Specifications·························································39
Disposal of the Unit ·················································40
Storage·································································40
Storage Instructions·················································40
Product Warranty····················································41
Service ·································································42

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Safety Considerations
Read this section carefully before use and be sure to follow the instructions.
Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
The precautions listed in this manual are designed to ensure safety and prevent
equipment damage and personal injury. For situations that may occur as a result
of erroneous handling, three different types of cautionary items are used to
indicate the degree of urgency and the scale of potential damage and danger:
DANGER, WARNING and CAUTION.
The three types of cautionary items above are very important for safety: be sure to
observe all of them as they relate to installation, use, maintenance, and repair.
Furthermore, TLV accepts no responsibility for any accidents or damage occurring
as a result of failure to observe these precautions.
Symbols
Indicates a DANGER, WARNING or CAUTION item.
DANGER
Indicates an urgent situation which poses a threat of death or
serious injury
WARNING
Indicates that there is a potential threat of death or serious injury
CAUTION
Indicates that there is a possibility of injury or equipment/product
damage
Checking the "Caution/Warning Stickers"
"Caution/Warning stickers" can be found on both the unit and some components.
The operator of this unit should understand what is written on the "Caution/Warning
stickers" before operating the unit.

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Precautions for the Entire Unit
WARNING
For applications such as handwashing in which hot water
directly touches hands, when using the one-pass method,
make sure to install a thermostatic mixing value at the outlet.
Failure to observe this precaution may result in burns, as water at
a temperature higher than the set temperature may flow due to
load fluctuations.
CAUTION
Install properly and DO NOT use this unit outside the
recommended operating pressure, temperature and other
specification ranges.
Improper use may result in such hazards as damage to the unit or
malfunctions that may lead to serious accidents.
When the unit is directly connected to municipal water supply
piping, back flow prevention measures must be taken in
accordance with the Water Supply Act (in Japan) or the
applicable law where the unit is to be used.
Failure to do so may lead to serious accidents in the water main
line.
The weight of the unit when empty is approximately 21 kg. If
it is difficult for one person to carry or install the product,
work with two or more people and use a lifting device so that
work can be performed safely.
Failure to do so may result in back strain or other injury if the
object should fall.
To use the unit safely and properly, read this instruction
manual carefully to carry out the specified work. Installation,
moving and incidental work of the unit requires professional
qualifications and skills. The work should be carried out by a
qualified personnel. Once installation is complete, make sure
that the work is carried out based on the instruction manual.
Work carried out improperly may lead to accidents or unit
malfunction.
Do not use well water or water from a hot spring.
Depending on the water quality, foreign matter may adhere to, or
corrosion may occur in, the unit piping, resulting in water leaks. In
this case, there will be a charge for repair work even during the
warranty period.
The unit consists of steam-using equipment and piping.
Proper insulation should be installed to avoid burns or heat
loss. Steam piping is hot, and even water piping may reach
temperatures up to 65 °C.
Insulate piping, as touching piping directly may result in burns.
The unit is not designed to withstand the surrounding piping
and equipment loads. Install the necessary piping or
equipment supports prior to unit installation, to prevent any
load being applied to the unit.
The impact of external force may damage the unit, leading to fluid
discharge, which may cause burns or other injury.
Continued on the next page

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CAUTION
When all the piping work is completed based on the system
flow diagram, inspect once again that all the piping
connections and internal G threaded connectors are properly
tightened, gaskets have been installed and that no parts or
connections are loose.
Failure to do so may result in burns or other injury from discharge
of fluids.
Take measures to prevent people from coming into direct
contact with outlets of the unit.
Failure to do so may result in burns or other injury from the
discharge of fluids.
Do not use excessive force when connecting threaded pipes
to the unit.
Over-tightening may cause breakage leading to fluid discharge,
which may cause burns or other injury.
Use only under conditions in which no freeze-up will occur.
Freezing may damage the unit, leading to fluid discharge, which
may different cause burns or other injury.
In case of an abnormality, install a safety fence or restrict
access to the room with a sign stating "Authorized personnel
only." etc. to prevent personnel unauthorized for the unit
(including those who have not received the relevant safety
education) touching the components. When doing so, stop
the supply of steam, electrical power, water and air.
Failure to prevent the access of unauthorized personnel may
result in burns, electric shock, injury, or falls.
Precautions for Operation
CAUTION
Hot water may flow out when water is initially supplied after
restarting operation. In addition, pay extra attention when
changing the set temperature or when the flow rate of hot
water changes significantly and check the temperature before
use.
To prevent burns, do not touch hot water for at least five seconds
after restarting operation. Residual hot water in the piping may flow
out when supplying hot water.
The unit should be operated in accordance with the proper
operating steps, within the specifications of the unit, such as
the maximum operating pressure (PMO) and maximum
operating temperature (TMO). Refrain from sudden operation
of any valves.
Failure to observe these precautions is dangerous and may result
in damage to the unit, malfunctions or failure of the unit, or lead to
serious accidents.
Do not rapidly reduce the valve opening on the hot water
outlet.
Failure to observe this precaution is dangerous, as there is a
possibility that water at a temperature higher than the set
temperature may temporarily flow.
Do not change the temperature settings without informing the
water user when washing hands, using a shower or cleaning.
Failure to do so may result in burns to the water user.
Continued on the next page

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CAUTION
Unit components such as steam piping may become hot
during operation.
Do not touch components with bare hands.
In the event of an earthquake, close the main steam supply
valve and shut down the unit promptly.
If the tube inside the heat exchanger of this unit is damaged
due to an earthquake, a large amount of steam will enter the
hot water piping, which may result in burns.
Valve and unit operation must be carried out by personnel who
have attended operation training ensuring the use of
heat-resistant gloves, helmet, protective glasses, etc. to
prevent burns.
Failure to do so may result in burns, as the piping and cover of the
unit become hot during operation.
When finishing operation, the operation should be stopped in
accordance with the proper steps.
Incorrect operation of the unit during use for hand washing,
showering, or cleaning, etc., may result in burns due to malfunction,
which causes the temperature of the water to rise above the set
temperature.
When draining water from the unit, make sure to wait until the
unit has cooled down.
If carrying out work after hot water use, there is a risk of burns, as
the components and the water inside the unit are hot.
Precautions when the Unit is Shut Down for a Long Period of Time
CAUTION
When the unit is shut down for a long period of time or there
is a possibility of freezing, make sure to completely
discharge steam condensate or water in the unit and its
components such as the steam piping, heat exchanger, etc.
After doing so, there is a risk of burns or injury during operation
start-up, as fluid may be discharged from piping.
Precautions when Maintenance or Inspection is Conducted
CAUTION
Be sure to use only the recommended components when
repairing the unit and its components, and NEVER attempt to
modify the unit in any way.
Failure to observe these precautions may result in damage to the
unit or burns or other injury due to malfunction or the discharge of
fluids.
Do not apply excessive force to the unit, pipings, and
peripheral piping.
Failure to do so may result in injury or deformation of the device.
When disassembling or removing the unit, wait until the
internal pressure equals atmospheric pressure and the
surface of the unit has cooled to room temperature.
Disassembling or removing the unit when it is hot or under
pressure may lead to discharge of fluids, causing burns, other
injuries or damage.
Make sure to wear protective gear such as a helmet, safety
glasses, long-sleeve shirt, heat-resistant gloves, protective
footwear, etc.
Failure to do so may result in burns or injuries.

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Precautions for Opening the Package
Make sure that the following items have been delivered and are inside the package.
If not, please contact TLV immediately.
Items packed with the unit
Name
Quantity
SteamAqua SQ-C01 unit
1
SteamAqua SQ-C01 instruction manual (this instruction manual)
1
Installation/Piping Installation Procedures for SteamAqua SQ-C01
1
Maintenance Procedures for SteamAqua SQ-C01
1
Operational Check/Cleaning Guide for SteamAqua SQ-C01
1
Standard accessories (delivered separately from the unit)
Name
Quantity
Steam Trap, TLV J3X-8, size 15 mm (Rc½)
1
Strainer, size 15 mm (Rc½)
1
Valve/strainer set (Option for JIS model only; delivered separately)
Name
Quantity
Strainer, TLV Y3, size 15 mm (Rc½)
1
Ball Butterfly Valve, TLV BB1N, size 15 mm (Rc½)
3
Note: Gaskets, bolts and nuts required to connect the unit to piping are not included.
Make sure to read the documentation packed with the unit as well as this instruction
manual, and always follow instructions.
Handle with particular care when unpacking the unit. Do not allow any impact to the
unit when unpacking, as this may affect perfomance.
In the event of deformation, damage, parts breakage, or missing unit components
found when unpacking the unit, contact TLV immediately.
When keeping the unit in storage, make sure to store it in a dry area inside the
building. Do not store the unit outdoors (e.g. covered with a waterproof sheet). The
performance of the unit cannot be guaranteed in the event of rust due to exposure to
rain or condensation.
Additional copies of instruction manuals can be supplied on request.
a) Contact TLV. (Please quote the serial no. of the unit.)
b) Access from the TLV website.

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Precautions for Moving the Package
Observe the following precautions when removing the unit from the box to transport.
In the event of failure to observe precautions, TLV is not liable for damage of the unit
or injury.
The weight of the unit when empty is approximately 21 kg. If it is difficult
for one person to carry or install the product, work with two or more
people and use a lifting device so that work can be performed safely.
Failure to do so may result in back strain or other injury if the object
should fall.
CAUTION
Follow the procedures below for moving the unit.
Moving procedures
1) Remove all items from the packaging except the unit.
2) Remove the unit from the box, then before moving the
unit, remove the cover. Loosen the screws fixing the
cover to the base. The screws are located at the center
of the top and bottom of the cover.
3) When moving the unit, make sure to hold the base or
the handles on the base as shown below. Do not hold
the unit by the cover, as the unit may fall, resulting in
damage or injury. Do not hold the unit by the piping, as
internal equipment may be damaged and pipe joints
may be loosened, resulting in water or steam leakage
when fluid is supplied.

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Configuration (Component Name and Function)
Piping Connection Details Chart
Name
Connection
A
Steam Inlet
15 mm JIS 5KFF or 15 ASME Class 150 RF
B
Condensate Outlet
15 mm JIS 5KFF or 15 ASME Class 150 RF
C
Cold Water Inlet
15 mm JIS 10KFF or 15 ASME Class 150 RF
D
Hot Water Outlet
15 mm JIS 5KFF or 15 ASME Class 150 RF
E
Water Safety Valve Outlet
Rc(PT) 3/8

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Component Configuration
Name
No.
Component
Description
Steam Supply
Unit
①
Pressure reducing
valve for steam
Adjusts the steam pressure supplied to
the unit.
・Fine adjustment of the steam pressure
is possible with the built-in pressure
reducing valve.
Heat Exchanger
Unit
②
Heat Exchanger
Produces hot water by exchanging
heat from steam supplied by the steam
supply unit (heating side) to water
(heated side).
⑨
Pressure gauge for
steam
Water Inlet
Piping Unit
⑥
Line relief valve
(Water Safety Valve)
Channels supplied cold water to each unit.
・Cold water is channelled to three
locations: heat exchanger unit,
pre-mixing unit, and mixing unit.
・The line relief valve (water safetyvalve)
prevents the internal pressure of the
equipment from exceeding a certain level.
⑦
Heat insulating joint
Pre-mixing Unit
③
Pre-mixing Valve
The hot water produced in the heat
exchanger unit is mixed with cold
water to prevent the water from
exceeding a certain temperature.
・The pre-mixing valve is one of the
safety features that prevents abnormally
high temperature water from being
discharged.
⑦
Heat insulating joint
Mixing Unit
④
Mixing Valve
Produces hot water of the required
temperature by mixing hot water and
cold water that have passed through
the pre-mixing unit.
・The temperature of the mixing valve can
be adjusted by turning the temperature
adjustment dial.
⑦
Heat insulating joint
Hot Water
Outlet Unit
⑧
Thermometer
Displays the water temperature
produced in the mixing unit and
supplied.
・Temperature can be adjusted while
checking the thermometer.
・The shock absorber absorbs a certain
amount of shock generated inside and
around the water piping inside the
equipment to prevent damage to the
equipment.
⑤
Shock absorber
Standard accessories (delivered separately)
Name
No.
Description
Steam Trap
⑩
Installed on the condensate outlet piping to discharge the
condensate in the heat exchanger unit.
・J3X-8 (Rc ½) and TLV strainer
Strainer
(for cold water
inlet)
⑪
Removes dust and scale from the supplied cold water.
Make sure to install the strainer correctly.
・TLV strainer (Rc ½), certified as conforming to the Water Supply
Act (Japan).
Note: - The gaskets and bolts included are intended for use with standard accessories only
- Accessories do not conform to the Water Supply Act (Japan) unless stated otherwise

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Options
In addition to standard accessories, a valve/strainer set is available as an option for
the JIS specification model.
The piping layout is an example. Optional accessories will be delivered separately.
Refer to the option drawings.
Valve/strainer set (Option for JIS model only; delivered separately)
Part Name
No.
Description
Strainer
(for steam inlet)
⑫
Remove dust and scale from the supplied steam to prevent it
from flowing into the unit.
・TLV Y3 strainer (Rc ½)
Ball Butterfly
Valve
(for steam inlet,
cold water inlet,
and hot water
outlet)
⑬
Install valves on each piping connection for emergency
shutoff and maintenance.
(Includes one for: steam inlet, cold water inlet, and hot water
outlet.) Valves are intended for maintenance or emergency use to
shut off steam and water supply.
Note: - The gaskets and bolts included are intended for use with standard accessories only
- Accessories do not conform to the Water Supply Act (Japan) unless stated otherwise
Contact TLV for specifications not shown here.

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Considerations for Installation Personnel
When the unit is directly connected to municipal water supply piping,
back flow prevention measures must be taken in accordance with the
Water Supply Act (in Japan) or the applicable law where the unit is to
be used. Failure to do so may lead to serious accidents in the water
main line.
CAUTION
1. Repair work on failure or damage to the unit as a result of installation or piping
work not adhering to the contents of this instruction manual or the attached
"Installation/Piping Procedures" will be billed even during the warranty period.
2. Installing water supply system
When the unit is directly connected to municipal water supply piping, back flow
prevention measures must be taken in accordance with the Water Supply Act (in
Japan) or the applicable law where the unit is to be used.
3. When commissioning the unit after installation, make sure to check the following
items:
a) After completion of the installation work, confirm the installation work based
on the "Before commissioning" in the "Installation Check List" on the
following page.
b) Make sure to observe the safety precautions when performing
commissioning.
c) After completing commissioning, confirm the items based on the "After
commissioning" in the "Installation Check List" on the following page.
4. Handling instructions for the user
The information necessary for handling of the unit should be explained to the
user according to this instruction manual. In particular, clearly explain the "Safety
Considerations" in the "Operation” chapter of this manual. Once all the
necessary instructions have been given to the user, pass the instruction manual
to the user.
5. Cleaning/sterilization
The unit has been cleaned only with water from a municipal water supply. If
special sterilization etc. is required, please follow the instructions provided by the
party responsible for installation.
6. Measures for prevention of damage due to freezing
If there is a possibility of freezing where the unit is used, water should be drained
from the unit after commissioning. Refer to the " Prevention of Damage due to
Freezing" section. If the unit is damaged as a result of freezing, repair work will
be billed even during the warranty period.

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Installation Check List
Item
Description
✓
Before
commissioning
The unit and its
surroundings
Have all packed items been included?
Has the unit been installed in
accordance with the procedures
packed with the product?
Have all five connection ports been
connected correctly?
Has the unit been installed securely
and stably? Has sufficient space
required for inspection and repair
been provided?
Have all the necessary parts and
piping been connected?
Have bolts and plugs been securely
tightened?
Have piping supports been firmly
installed?
Are the supply conditions for steam
and water appropriate?
Has piping in the unit been
additionally tightened after
installation?
After
commissioning
Initial blowdown
Has initial blowdown been conducted?
Commissioning
Has the water temperature stabilized
after start-up?
Fluid Leakage
Are there any leaks from any area of
the unit?
Abnormal
sounds/vibrations
Does the unit vibrate, or is there a
sound of 80 dB or more?
Preventative
measures against
freezing
Have any measures been taken for
prevention of damage due to freezing
if the unit is not used for a long period
of time?
Explanation to the
customer
Have instructions for safe use been
provided to the customer?

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Precautions before Unit and Piping Installation
The weight of the unit when empty is approximately 21 kg. If it is difficult
for one person to carry or install the product, work with two or more
people and use a lifting device so that work can be performed safely.
Failure to do so may result in back strain or other injury if the object
should fall.
CAUTION
1. Be sure to read the "Installation/Piping Installation Procedures" packed with the
unit before installing the product.
2. Make sure to consult the user about the specific installation location.
a) Where possible, discuss and confirm the unit installation method and
piping/wiring work from the building's design stage.
b) The unit should not be installed near staircases or evacuation exits.
c) Check the drainage situation of the location where the unit is to be installed.
Make sure that the unit will not be flooded or immersed in water.
3. When installing the unit in a high place, make sure to install the unit at a location
where maintenance work etc. can be carried out, and where handrails etc. are
installed to prevent falling. If work cannot be performed, TLV may refuse
after-sales service.
4. In areas where salt damage is likely (areas close to the ocean that receive a sea
breeze), the unit should be installed in a downwind area of the building.
When it is necessary to install the unit facing the coast, take measures to protect
the unit from the sea breeze, such as installing a windbreak screen, etc.
5. Installation and maintenance space
a) Before installing the unit, determine the installation position and then set the
anchor bolts. (M10 bolts with an embedded length of 4.5 cm or more are
recommended.)
b) Maintenance space: In order to inspect and repair unit components, install
the unit with maintenance space in accordance with the diagram shown
below to secure sufficient distance from the surrounding walls and
components. If there is insufficient maintenance space, maintenance work
may be refused.
c) Make sure to install the unit on a sturdy, vertical wall.

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6. Precautions before connecting to piping
Make sure to flush the steam piping and water supply piping before connecting
the unit. The purpose of flushing the piping is different from the initial blowdown,
which is carried out to discharge condensate before operation. Flushing is
performed to remove the residual sealing material, metal chips, sand or scale in
the piping. Therefore, it is necessary to vigorously flush the piping from as large
an opening as possible. Keep personnel and components away from the opening
when flushing the piping. Sealing material or dust entering the piping may cause
problems such as deterioration of heat transfer efficiency, improper operation of
the unit, valve leakage, etc.

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Piping Work
For applications such as handwashing in which hot water directly
touches hands, when using the one-pass method, make sure to install a
thermostatic mixing value at the outlet. Failure to observe this precaution
may result in burns, as water at a temperature higher than the set
temperature may flow due to load fluctuations.
WARNING
Install properly and DO NOT use the unit outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the unit or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of the unit to below the conditions quoted.
CAUTION
To use the unit safely and properly, read this instruction manual carefully
to carry out the specified work. Installation, moving and incidental work
of the unit requires professional qualifications and skills. The work should
be carried out by a qualified personnel. Once installation is complete,
make sure that the work is carried out based on the instruction manual.
Work carried out improperly may lead to accidents or unit malfunction.
CAUTION
Do not use well water or water from a hot spring. Depending on the
water quality, foreign matter may adhere to, or corrosion may occur in,
the unit piping, resulting in water leaks. In this case, there will be a
charge for repair work even during the warranty period.
CAUTION
Do not use excessive force when connecting threaded pipes to the unit.
Over-tightening may cause breakage leading to fluid discharge, which
may cause burns or other injury.
CAUTION
The unit consists of steam-using equipment and piping. Proper insulation
should be installed to avoid burns or heat loss. Steam piping is hot, and
even water piping may reach temperatures up to 65 °C. Insulate piping,
as touching piping directly may result in burns.
CAUTION
The unit is not designed to withstand the surrounding piping and
equipment loads. Install the necessary piping or equipment supports
prior to unit installation, to prevent any load being applied to the unit.
The impact of external force may damage the unit, leading to fluid
discharge, which may cause burns or other injury.
CAUTION
When all the piping work is completed based on the system flow
diagram, inspect once again that all the piping connections and
internal G threaded connectors are properly tightened, gaskets have
been installed and that no parts or connections are loose. Failure to do
so may result in burns or other injury from discharge of fluids.
CAUTION
Take measures to prevent people from coming into direct contact with
outlets of the unit. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
1. For piping
a) The pipe diameter should not be smaller than the diameter of the unit
connections.
b) For steam piping, make sure the piping is connected with a downward slope
on the downstream side.
c) The piping should be kept simple, with as few joints as possible in order to
avoid pressure loss.
d) Take measures for the location where air may accumulate, such as installing
an air vent valve, etc. so that air does not accumulate.

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e) When installing the peripheral piping, be sure to support the surroundings so
that the load and stress of the piping and other equipment are not applied to
the unit.
f) For the water supply system and components to be connected to the unit,
follow the instructions provided by the organization that designed and
installed the system.
2. Precautions for installing piping
Do not apply excessive force to the the unit, pipings, and peripheral
piping. Failure to do so may result in injury or deformation of the device.
CAUTION
Precautions for installing piping at locations (1) to (5) (as shown below) are on the
following page.
* The piping diagram above is one example.
It does not contain items not included with the unit or the standard accessories.

172-65702M-04 (SQ-C01) 10 Dec 2020
18
(1) Steam Inlet Piping
a)Install a pressure gauge at the
steam inlet.
Supply steam pressure range:
0.2 to 0.7 MPaG.
b)Make sure to install piping
support(s) for the steam inlet
piping.
c) Install a valve for emergency shutoff
and maintenance at the steam
inlet.
d)Make sure to install a strainer at
steam inlet.
e)Install a steam trap upstream of the
unit to prevent condensate in the
steam transportation line from
flowing into the unit.
f) When recovering the condensate,
install a check valve on the
secondary side of the steam trap to
prevent backflow.
g)Make sure to insulate the steam
piping as it becomes very hot.
h)When using a pressure reducing
valve to supply steam to the unit, make sure to install a safety valve on the
secondary side of the pressure reducing valve if the pressure on the
primary side of the pressure reducing valve exceeds 0.7 MPaG.
(2) Cold Water Inlet Piping
a)Make sure to install piping
support(s) for the cold water inlet
piping.
b)Install a valve at the cold water inlet
for maintenance. (The valve is
included with the optional
valve/strainer set for the JIS
specification model.)
c) Install a strainer at the cold water
inlet to prevent malfunction of
internal safety functions.

172-65702M-04 (SQ-C01) 10 Dec 2020
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(3) Condensate Outlet Piping
a)There is no steam trap installed in
the unit. Make sure to install the
steam trap provided as as a
standard accessory. (When using
another steam trap, contact TLV.)
b)Make sure that the piping installed
between the unit and the steam
trap is as short as possible, with as
few bends as possible so the
condensate will flow naturally down
into the trap.
c) Make sure to pipe the discharged
condensate to a safe area such as
a pit. The temperature of steam
condensate discharged from the
unit exceeds 100 C. Do not use
PVC or lead piping intended for
water supply.
d)When recovering the condensate,
install a check valve on the
secondary side of the steam trap to
prevent backflow when the unit is
shut down. The back pressure of
the condensate recovery piping
should be lower than the steam
pressure in the unit. (The internal
steam pressure can be confirmed
with the pressure gauge installed
on the left side of the unit.)
e)Make sure to insulate the
condensate outlet piping as it
becomes very hot.
(4) Hot Water Outlet Piping
a)Install a valve at the hot water outlet
for maintenance. (When operating
water with a valve, it is
recommended to install different
valves for operation and
maintenance.)
b)For use in applications where hot
water is in direct contact with skin,
such as handwashing, make sure
to install a safety eqipment such as
a thermostatic faucet on the
secondary side on the unit.