W
W
T-KD20 Instantaneous Water
Heater Installation Manual and Owner’s Guide
Flash Water Heater
Model T-KD20
Suitable for potable water heating and space heating
FEATURING
• ENDLESS HOT WATER
• ON DEMAND
• COMPACT, SPACE SAVING
• ENERGY CONSERVING
• COMPUTER CONTROLS
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
This product must be installed and
serviced by a licensed plumber, a
licensed gas fitter, or a professional
service technician and/or in accordance
with all local code. Improper installation
and/or operation, or installation by an
unqualified person, will void the warranty.
Operation of this unit creates carbon
monoxide gas and flue gases which can
cause serious injury or death. In addition,
if the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or death.
Takagi Industrial Co. USA Inc.
3-B Goodyear
Irvine, CA 92618
Toll Free (888) 882-5244 USA
Toll Free (877) 877-4935 CANADA
www.Takagi.com
ARNING
ARNING
CONTENTS
Specification …………. 2
Introduction …………..3
For your safety …………..3-4
Installation …………. 5
• General …………. 5
• Accessories …………. 5
• Indoor Installation …………. 6
• Venting Instructions …………..6 -8
• Gas Supply/Gas Pipe sizing………..9-10
• Water Connection …………. 10-11
• Electrical Connection …………. 11
• Initial operation …………. 12
Normal operation …………. 12
• Flow …………. 12-13
• Temperature setting …………. 13
• Freeze Protection Device …………. 13-14
• Maintenance and Service …………..14-15
• Error codes …………..15
Wiring diagram …………..16
For your Safety …………..17
Danger …………..18
Application …………..19
• Space Heating …………..19
• Dual-purpose heating …………..20
• Storage Tank …………..21
• Re-Circulation …………..21
Optional Items …………..22
Component Diagram …………23-25
Component Diagram …………..26
Output temperature Chart …………..27
Natural Gas Input Min. 20,000 Btu
Max. 185,000 Btu
LPG Input Min. 19,000 Btu
Max. 175,000 Btu
Gas Connection ¾” NPT
Water Connections ¾” NPT
Water Pressure Min. 15 psi
Max. 150 psi
Natural Gas Pressure Inlet Min. 5” WC
Max. 10.5” WC
LP Gas Pressure Inlet Min. 11” WC
Max. 14” WC
Manifold Pressure Natural 2.3” WC
Propane 2.5” WC
Weight 60 lbs.
Dimensions 24.5”x16.5”x8.3”
Ignition Electronic Ignition
Electrical Supply AC 120 V
• Check the rating plate to ensure this
product matches your specifications;
• Before installing in areas over 4,500 feet
above sea level, contact Takagi;
• Takagi is constantly improving its products
therefore specifications are subject to
change without prior notice.
SPECIFICATIONS
*** NOTE ***
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INTRODUCTION
This manual provides information necessary
for the installation, operation, and maintenance
of the Model T-KD20 water heater. This unit
includes a fan enabling sidewall (power)
venting and an advanced electronic ignition
system.
The model description is listed on the rating
plate which is attached to the front cover of the
water heater. Please read all installation
instructions completely before installing this
product. If you have any problems or
questions regarding this equipment, consult
with Takagi or its local representative.
Experiences have shown that most operating
problems are caused by improper installation.
The T-KD20 Water Heater is an instantaneous,
tankless water heater designed to supply
endless hot water to your entire household
and/or commercial facility utilizing total
efficiency. The principle behind the T-KD20
Water Heater is simple. Once you open a hot
water tap, water flows through the T-KD20
Water heater. Once a minimum of 0.75 GPM is
achieved, the flow sensor automatically
commands the computer to turn on the fan,
activate the electronic igniter and open the gas
valves. The computer monitors water
temperature, water flow rate and gas flow to
ensure that you get the right amount of hot
water at the correct hot water temperature.
After the burners are ignited, the “fire on” lamp
is lit. The computer will modulate the gas
supply valve and water flow. 0.75 gallons per
minute is required to turn the burners on; after
the burners are ignited, the flow rate can be
lowered to 0.6 gallons per minute to maintain
the heater on. It is advisable to open further
the cold tap rather than decreasing the hot tap
to adjust the water temperature. As long as
you have water, gas and electricity, you will get
an endless flow of hot water. Open a hot water
tap to turn on your water heater. Close the tap
to turn off your water heater.
FOR YOUR SAFETY
The installer is responsible for the correct
installation of your Flash T-KD20 Water
Heater. Installation and service must be
performed by a qualified installer (for
example, a licensed plumber or gas fitter)
otherwise the warranty by Takagi will be
void.
PLEASE READ THIS MANUAL CAREFULLY
AND FOLLOW ALL DIRECTIONS.
1. Follow all local codes, or in the absence of
local codes, follow the most recent edition
of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 in the USA or the
CAN/CSA B149.1 Natural Gas and
Propane Installation Code in Canada.
2. Properly ground the unit in accordance with
all local codes or in the absence of local
codes, with the National Electrical Codes,
ANSI/NFPA 70 in the USA or CSA
standard C22.1 Canada Electrical Code
Part 1 in Canada.
3. Carefully plan where you intend to install
your T-KD20 Water Heater. Ensure that
your heater will have enough combustible
air and proper ventilation and locate your
heater where water leakage will not do
damage to surrounding areas. If there is a
possibility of water damage, install a
suitable drain pan under the unit which will
not restrict combustible airflow.
4. Check the rating plate for the correct gas
type, gas pressure, water pressure and
electrical rating. If this unit does not match
your requirements, do not install.
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Rating plate
5. If any problem should occur, turn off all hot
water taps and turn off the gas. Then call a
trained technician or the Gas Company or
the manufacturer.
6. WARNING: Do not disconnect the
electrical supply if the ambient temperature
will drop below freezing. The Freeze
Prevention Device only works if the unit
has electrical power. The Freeze
Prevention Device is rated for temperatures
down to 5 ºF (-15 ºC) in a wind free
environment. Refer to the section on
Winterizing and the Freeze Prevention
Device for more information. The Warranty
will not be covered if the heat exchanger is
damaged due to freezing.
7. WARNING: Water temperatures over
125ºF can cause severe burns instantly or
death from scalding. The water
temperature is set at 122ºF (50ºC) from the
factory to minimize any scalding risk.
Before bathing or showering always check
the water temperature.
8. WARNING: Do not use this appliance if
any part has been in contact with or been
immersed water. Immediately call a trained
technician to inspect and/or service the unit
if necessary.
9. WARNING: Do not store or use gasoline or
other flammables, vapors or liquids in the
vicinity of this appliance.
GENERAL
The T-KD20. Water Heater is an
instantaneous, tankless water heater designed
to supply endless hot water to your entire
household and/or commercial facility utilizing
total efficiency. The principle behind the TKD20 Water Heater is simple. Once you open
a hot water tap, water flows through the TKD20 Water heater. Once a minimum of 0.75
GPM is achieved, the flow sensor
automatically commands the computer to turn
on the fan, activate the electronic igniter and
open the gas valves. The computer monitors
water temperature, water flow rate, and gas
flow to insure that you get the right amount of
hot water at the correct hot water temperature.
After the burners are ignited, the “fire on” lamp
is lit. The computer will modulate the gas
supply valve and water flow 0.75 gallons per
minute is required to turn the burners on;, after
the burners are ignited, the flow rate can be
lowered to 0.6 gallons per minute to maintain
the heater on. It is advisable to increase the
cold tap rather than decreasing the hot tap to
adjust the water temperature. As long as you
have water, gas and electricity, you will get an
endless flow of hot water. Open a hot water tap
to turn on your water heater. Close the tap to
turn off your water heater.
10. WARNING: Do not reverse the water
and/or gas connections as this will damage
the gas valves and can cause severe injury
or death. Following the diagram below
when installing your water heater:
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INSTALLATION
GENERAL
All gas water heaters require careful and
correct installation to ensure safe and efficient
operation. This manual must be followed
exactly. Read the “For Your Safety” section at
the beginning of this manual.
1. The gas regulator is preset at the
factory; it is computer controlled and
should not need adjustment;
2. Maintain proper space for servicing.
Install the unit so that it can be
connected or removed easily;
3. The electrical connection requires a
means for switching off the power
supply;
4. If you will be installing the unit in a
contaminated area with a high level of
dust, sand, flour, aerosols or other
contaminants, they can become
airborne and enter and buildup within
the fan and burner causing damage to
the unit. The warranty will not cover
damage caused to the unit due to
installation in a contaminated
environment that has not been
converted.
5. Particles from these objects may clog
the air vent or reduce the functions of
the rotating fan and cause improper
burning of the gas. Regular
maintenance is recommended for these
types of environment.
6. Do not install the unit where the
exhaust vent is pointing into any
opening in a building or where the
noise may disturb your neighbors.
Make sure the clearance from the vent
termination to the doorway or opening
to prevent exhaust from entering. Take
a look at page 8.
7. Some chemicals used in a beauty salon
may affect the flame sensor. Water
heater may not work properly. Please
consult with Takagi, when the water
heater is installed in a beauty salon.
8. Water hardness may affect the water
heater. Water heater may be damaged.
The warranty will not cover damage
caused by water quality.
Direct Vent: Also known as Sealed
Combustion. Systems are all air for
combustion is derived directly from the outside
atmosphere and all flue gases are discharged
to the outside atmosphere. All Takagi products
flue gas vents are pressurized, requiring
careful sealing of all joints.
Category III Vent: A system that operates with
a positive vent static pressure and with a vent
gas temperature. T-KD20 flue gas vents are
positive pressure, it requires perfect seal of all
vent pipe joints.
Accessories
Check that the installation manual, the
extension cable and the warranty card were
included with the unit.
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INDOOR INSTALLATION
When installed indoors, the T-KD20 water
heater shall be located in an area to maintain
the following minimum clearances around the
unit:
Indoor Installation Service Clearances
Left side of heater 6”
Front (Maintenance space) 24”
Back of heater 1”
Right side of heater 2”
Top of heater 12"
The diagram below details the required
clearances around the unit:
Wall Hanging Installation
For a wall mount installation, use TK-BK01
brackets to securely attach the T-KD20 to the
wall.
Locate the heater as desired, but follow all
applicable local codes, as well as the indoor or
outdoor clearances that apply to the
installation.
Standing Installation
If the unit is to be installed standing on a
surface, adjust the legs so that the unit stands
securely and is level (legs can be adjusted up
to 1”).
Do not install the unit standing directly on a
combustible surface. Use a 3” noncombustible base.
Use the included L brackets to connect the unit
to a wall to ensure that it does not fall over.
These brackets will maintain the required 1”
clearance between the back of the unit and a
combustible surface.
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Combustion Air and Ventilation
This water heater must be vented in
accordance with the section “Venting of
Equipment" of the latest edition of the Natural
Fuel Gas Code, ANSI Z223.1 and all
applicable local building codes. In Canada,
follow section 7 of the CAN/CSA B149.1
Natural Gas and Propane Installation Code.
Combustible Air Supply
The T-KD20 is direct vent (Sealed
Combustion) system that all combustible air
supplies from outside building. The T-KD20
must be installed in a location where the
proper amount of combustible air will be
available to it at all times without obstructions.
As combustible air supply pipe can be used
suitable 3” pipe such as, steel, PVC or ABC
pipe supply air pipe.
WARNING: Improper venting of this appliance
can result in excessive levels of carbon
monoxide which can result in severe personal
injury or death.
VENTING INSTRUCTIONS
General
- 7 -
Exhaust Vent
This is a Category III appliance and must be
vented accordingly. The vent system must be
sealed air tight. All seams and joints must be
sealed with high heat resistant silicone sealant
or UL listed aluminum adhesive tape having a
minimum temperature rating of 350ºF. For best
results, a vent system should be as short and
straight as possible.
This unit requires 4”, Category III approved,
single wall stainless steel vent pipe or any
other Category III approved, non-combustible,
corrosion-resistant material. The following are
UL listed manufacturers: ProTech Systems Inc.
(FasNSeal), Flex-L Inc., Z-Flex Inc. (Z-Vent III)
and Heat-Fab Inc. (Saf-T Vent). Follow the
vent pipe manufacturer’s instructions when
installing the vent pipe. Do not common vent
this appliance with any other vented appliance.
The maximum length of exhaust vent piping
must not exceed 25 ft. deducting 5 ft. for each
elbow used in the venting system. Do not use
more than 3 elbows.
Diam
eter
4” 3 Ea. 25 ft
For each elbow added, deduct 5 ft. from
max. Vent length.
Horizontal Length
Max.
No. of
Elbow
No. of Elbows Max. Vertical or
Max. Vertical or
Horizontal run in
Length
0 25 ft.
1 20 ft.
2 15 ft.
3 10 ft.
When installing the vent system, all applicable
national and local codes must be followed. If
you install thimbles, fire stops or other
protective devices and they penetrate any
combustible or noncombustible construction,
be sure to follow all applicable national and
local codes.
When the horizontal vent run exceeds 5 ft., the
following criteria must be observed:
• Support the vent run at 3 ft intervals with
overhead hangers.
• Slope the vent run downwards toward the
vent terminator at a rate of ¼” per foot.
Vent Termination
A sidewall vent terminator must be used when
the water heater is vented through a sidewall.
Takagi recommends the use of its part No.TKTV05. The vent terminator provides a means of
installing vent pipe through the building wall
and must be located in accordance with ANSI
Z223.1/NFPA 54, or in Canada with CAN/CSAB149.1 and local applicable codes.
Locate the vent terminator so that it cannot be
blocked by snow. Most codes require that the
terminator be at least 12 inches above grade,
but the installer may determine if it should be
higher depending on the job site condition and
applicable codes.
WARNING: Improper installation can cause
nausea or asphyxiation, severe injury or death
from carbon monoxide and flue gases
poisoning. Improper installation will void
product warranty. For high altitude installation
above 4,500 feet, contact Takagi on how to
handle this situation.
General rules for venting the T-KD20 water
heater are:
1. Place the water heater as close as possible
to the vent terminator;
2. The vent collar of the water heater must be
fastened directly to an unobstructed vent
pipe.
3. Do not weld the vent pipe to the water
heater collar.
4. The weight of the vent stack must not rest
on the water heater.
5. The vent must be easily removable from
the top of the water heater for normal
service and inspection of the unit.
6. The water heater vent must not be
connected to any other gas appliance or
vent stack.
7. Avoid locating the water heater vent
terminator near any air intake devices or
air-conditioning units. These fans can pick
up the exhaust flue products from the water
heater and return them to the building. This
can create a health hazard.
8. Avoid using an oversized vent pipe or using
extremely long runs of the pipe.
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Canada U.S.A
Clearance above grade, veranda, porch,
A
deck, or balcony.
Clearance to window or door that may be
B
opened.
Clearance to permanently closed window * * *
C
Vertical clearance to ventilated soffit located
above the vent terminator within a horizontal
D
distance of 2 feet (61cm) from the center
line of the terminator.
Clearance to unventilated soffit * * *
E
Clearance to outside corner * * *
F
Clearance to inside corner * * *
G
Clearance to each side of center line
H
extended above meter/regulator assembly
Clearance to service regulator vent outlet. 3 feet * *
I
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
J
other application.
Clearance to mechanical air supply inlet. 6 feet 3 feet 3 feet
K
Clearance above paved sidewalk or paved
L
driveway located on public property.
Clearance under veranda, porch deck, or
M
balcony.
*For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA-B149, please use clearances in accordance
with local installation codes and the requirement of the gas supplier.
Direct vent and
other than Direct Vent
1 foot 1 foot 1 foot
3 feet 1 foot
* * *
3 feet * *
3 feet 1 foot
7 feet * 7 feet
1 foot * *
Direct vent Other than Direct Vent
4 feet from below or
side opening. 1 foot
from above opening.
4 feet from below or
side opening. 1 foot
from above opening.
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