Takagi T-H1 Installation Manual And Owner's Manual

W

W

T-H1 Instantaneous Appliance

Installation Manual and Owner’s Guide

Flash Appliance

Model T-H1

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

• HIGH EFFICIENCY

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.

Irvine, CA 92618

Toll Free [phone] USA

Toll Free [phone] CANADA

www.Takagi.com

ARNING

ARNING

5 Whatney

CONTENTS

Specifications …………. 2

Introduction …………..3

For Your Safety …………. 3-4

T-H1 Components …………. 4

Installation …………. 5

• General …………. 5

• Accessories …………. 5

• Outdoor Installation …………. 5-6

• Indoor Installation …………. 6-7

• Venting Instructions …………..7-9

• Gas Supply / Gas Pipe size………..10-11

• Water Connections ………….11-12

• Electrical Connections ………….13

• Initial Operation ………….13

Normal Operation …………..14

• Flow …………..14

• Temperature Settings …………..15

• Freeze Protection Devices………….16

• Maintenance and Service …………..16-17

• Error Codes …………..17

Wiring Diagram …………..18

For your safety …………. 19

Natural Gas Input Min. 15,000 Btu
Max. 199,000 Btu

Propane (LP) Gas Input Min. 18,000 Btu
Max. 190,000 Btu

Gas Connection ¾” NPT
Water Connection ¾” NPT
Condensate water drain ½” 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 2.6” WC
Propane 2.8” WC

Weight 90 lbs.

Dimensions 29.5”x18.9”x11.8”

Ignition Electronic Ignition

Electrical Supply AC 120 V

Danger …………. 20

Applications ………… 21

• Space Heating …………..21

• Dual-purpose heating …………..22

• Storage Tank …………..23

• Re-Circulation …………..23

Optional Items …………..24

Component Diagram …………25-28
Part List …………29-30
Output temperature Chart …………..31

• Check the rating plate to ensure this
product matches your specifications;

• This appliance is certified for use at
altitudes from 0ft to 4500ft (1,370m) in
accordance to the latest CAN/CGA 2.17­High Altitude Installation procedures at
normal manifold pressure 2.6" (Natural
Gas) W.C. Do not alter the orifice jets or
gas supply pressure. At altitudes of 4500ft
to 5,000ft (1524m) lower the manifold
pressure to 2.4 (Natural Gas) " W.C. At
5000ft to 6000ft (1,829m), lower the
manifold pressure to 2.2" (Natural Gas)
W.C. For elevations above 6000ft or for
specific instructions on how to lower the

SPECIFICATIONS

*** NOTE ***

manifold pressure, please call the Takagi
office

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligations.

- 2 -

INTRODUCTION

This manual provides information necessary
for the installation, operation, and maintenance
of the Model T-H1 appliance. This unit includes
a fan enabling sidewall (power) venting, an
advanced electronic ignition system and a
condensate neutralizer.
The model description is listed on the rating
plate which is attached to the front cover of the
appliance. 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-H1 Appliance is an instantaneous,
tankless appliance designed to supply endless
hot water to your entire household and/or
commercial facility utilizing total efficiency. The
principle behind the T-H1 Appliance is simple.
Once you open a hot water tap, water flows
through the T-H1 Appliance. 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 appliance 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 appliance. Close the tap to
turn off your appliance.

FOR YOUR SAFETY

The installer is responsible for the correct
installation of your Flash T-H1 Appliance.
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-H1 Appliance. Ensure that your
appliance will have enough combustible air
and proper ventilation and locate your
appliance 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.

- 3 -

H

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 0ºF (-18ºC) 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.

OT

GAS

COLD

11. WARNING: When the T-H1 is operating,
the surface of the front cover can become
very hot. Please do not touch

T-H1 COMPONENTS

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.

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 appliance:

- 4 -

INSTALLATION

All gas appliances 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. In those environments,
please purchase the optional TK-TV07
direct vent conversion kit and convert the
T-H1 to a sealed combustion unit. The
warranty will not cover damage caused to
the unit due to installation in a
contaminated environment that has not be
converted using the TK-TV07.

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 vent
termination is 4 feet from a doorway or
opening to prevent exhaust from entering.

7. A condensation drain must be connected to
the neutralizer drain plug.

8. Some chemicals used in a beauty salon
may affect the flame sensor. Appliance
may not work properly. Please consult with
Takagi, when the appliance is installed in a
beauty salon.

9. Water hardness may affect the appliance.
Appliance may be damaged. The warranty
will not cover damage caused by water
quality.

GENERAL

ACCESSORIES

Check that the installation manual, the
extension cable and the warranty card were
included with the unit.

OUTDOOR INSTALLATION

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/NFPZ 54 in the USA or the CAN/CSA
B149.1 Natural gas and Propane installation
Code in Canada.

Ensure that the unit is set for outdoor
installation. The ‘OUT’ dipswitch on the
computer board should be switched to its ‘ON’
(up) position:

Outdoor dip switch setting

When installed outdoors, the T-H1 appliance
shall be wall mounted only. Locate the
appliance in an open, unroofed area and
maintain the following minimum clearances:

Outdoor Installation Service Clearances

Piping side (Bottom) 12”

Front (Maintenance space) 24”

Back of appliance 1”

Sides of appliance 2”

Top of appliance 36”

- 5 -

The diagram below details the required

clearances around the unit:

WARNING: Do not install this appliance under
an overhang less than 3 feet from its top or
eaves. The area under an overhang must be
open to three sides

WARNING: Do not have the vent terminal
pointing toward any opening into a building. Do
not locate your appliance in a pit or location
where gas and water can accumulate.

WARNING: Do not install the appliance where
water, debris or flammable vapors may get into
the flue terminal. This may cause damage to
the appliance and void the warranty.

INDOOR INSTALLATION

When installed indoors, the T-H1 appliance
shall be located in an area to maintain the
following minimum clearances around the unit:

Indoor Installation Service Clearances

Piping side (Bottom) 12”

Front (Maintenance space) 24”

Back of appliance 1”

Sides of appliance 2”

Top of appliance 12"

Combustion Air Supply

The appliance location must provide enough
air for proper combustion and ventilation of the
surrounding area. See the latest edition of
ANSI Standard Z223.1 or any applicable local
codes. In general, these requirements specify
that if the unit is installed in a confined space,
there must be a permanent air supply opening.

Air Supply from Outside Building

When combustion air is supplied from outside
the building, an opening communicating
directly with the outside should have a
minimum free area of one square inch per
15,000 BTU/H input of the total input rating of
appliance in the enclosed area.

When combustion air is supplied from inside
the building, an opening communicating with
the rest of the dwelling should have a minimum
free area of one square inch per 1000 BTU/H
input of the total input rating of appliance in the
enclosed area. These openings should never
be less than 100 sq. in.

Minimum recommended air supply opening size
for appliance:

Air Supply from Inside Building

WARNING: Do not install the appliance vent
terminator within 4 feet in the USA of any air
intake or building opening, and with in 3 feet in
Canada of any air intake or building opening.
(Refer to Page.9)

Appliance
size

Max. 199,000

BTU/H

- 6 -

When drawing
make-up air
from outside
the building

13.5 square
inches

When drawing make-up
air from inside the
building (from other
rooms within)

199 square inches

Combustible Air Supplied by Mechanical

The T-H1 appliance is equipped with a
combustible air sensor that will shut off the unit
when inadequate combustible air supply to unit
is detected.

If a mechanical fan or make up air device is
used to supply air to the appliance or utility
room, the installer should make sure it does
not create drafts which could cause nuisance
shutdowns. If a blower is necessary to provide
adequate combustion air to the appliance, a
switch or equivalent device must be wired
(interlocked) with the appliance control circuit
or other proper devices to prevent the
appliance from firing unless the blower is
operating.

fan or Make up air device.

Direct intake vent system

This T-H1 appliance may be converted to a
direct vent (sealed combustion) appliance by
installing an adapter (part No TK-TV07) which
will bring all required combustible air from
outside the building. The T-H1 must be
installed in a location where the proper amount
of combustible air will be available to it at all
times without obstructions. If used as a direct
vent appliance, the T-H1 requires a 3”
combustible air supply pipe. The intake pipe
must be sealed airtight with aluminum tape and
can be made of ABS, galvanized steel,
corrugated aluminum, corrugated stainless
steel or Category III stainless steel.

Ensure that the unit is set for direct vent and
indoor installation. The ‘DIRE’ dipswitch on the
computer board should be switched to its ‘ON’
(up) position and the ‘OUT’ dipswitch should
be switched to its ‘OFF’ (down) position:

Direct vent dip switch settings

4” exhaust3” intake

VENTING INSTRUCTIONS

General

WARNING: Improper venting of this appliance
can result in excessive levels of carbon
monoxide which can result in severe personal
injury or death.

This appliance 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.

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 50 ft. deducting 5 ft. for each
elbow used in the venting system. Do not use
more than 5 elbows.

Pipe

Diam

eter

4” 5 50 ft

For each elbow added, deduct 5 ft. from
maximum vent length:

Max. #

of

Elbows

# of Elbows

Maximum Vertical or

Horizontal Vent Length

Max. Vertical or

Horizontal Length

0 50 ft.
1 45 ft.
2 40 ft.
5 25 ft.

- 7 -

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 terminal at a rate of ¼” per foot.

Vent Termination

A sidewall vent terminator must be used when
the appliance is vented through a sidewall.
Takagi recommends the use of its part No.TK­TV01 or the TK-TV05 with the TK-TV07 when
using the direct vent option. 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/CSA-B149.1 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.

Condensation drain
(Install according to
local code)

TK-TV03 (Back flow
prevention)

Rain cap

Roof
Flashing

The exhaust
goes to the roof

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-H1 appliance
are:

1. Place the appliance as close as possible
to the vent terminator;

2. The vent collar of the appliance must be
fastened directly to an unobstructed vent
pipe.

3. Do not weld the vent pipe to the appliance
collar.

4. The weight of the vent stack must not rest
on the appliance.

5. The vent must be easily removable from
the top of the appliance for normal service
and inspection of the unit.

6. The appliance vent must not be connected
to any other gas appliance or vent stack.

7. Avoid locating the appliance vent
terminator near any air intake devices or
air-conditioning units. These fans can pick
up the exhaust flue products from the
appliance 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.

z Regarding the clearance from the

terminator to the air inlet or opening,
refer to the next page.

z Install a condensation drain in the

venting.

z Follow the vent system to vent

manufacture’s instruction and local
code.

z Do not common vent or connect any

vent of appliance to the vent.

z Use the 4” category III Vent pipe

approved, single wall stainless steel
vent pipe.

- 8 -

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

Direct vent and

other than Direct Vent

1 foot 1 foot 1 foot

3 feet 1 foot

Direct vent Other than Direct Vent

4 feet from below or
side opening. 1 foot

from above opening.

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.

3 feet * *

4 feet from below or

3 feet 1 foot

side opening. 1 foot

from above opening.

7 feet * 7 feet

1 foot * *

*For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA-B149.1, please use clearances in
accordance with local installation codes and the requirement of the gas supplier.

- 9 -

GAS S SIZING

TO TURN OFF GAS TO

APPLIANCE

1. Turn off all electric power to the
appliance if service is to be
performed.

2. Turn the manual gas valve located
on the outside of the unit clockwise
3 to the off position.

FOR YOUR SAFETY, READ

BEFORE OPERATING:

A. This appliance does not have a

pilot. It is equipped with an
electronic ignition device that
automatically lights the burner. Do
not try to light the burner manually;

B. BEFORE OPERATING, check all

around the appliance area for gas
leaks. Be sure to check next to the
floor as some gases are heavier
than air and will settle on the floor;

C. Use only your hand to turn the gas

valve knob. Never use tools. If the
knob will not turn by hand, do not
attempt to repair it. Call a qualified
service technician. Force or
attempted repair may result in a fire
or explosion.

D. WARNING: Conversion of this unit

from natural gas to propane or
propane to natural gas cannot be
done in the field. Contact your local
distributor to get the correct unit for
your gas type. Conversion done by
anyone other than the
manufacturer will void all warranty

Check that the type of gas matches the rating
plate located on the cover of your appliance.

The minimum and maximum inlet gas pressures
are:

Natural Gas Min. 5” WC - Max. 10.5” WC

Propane Gas Min. 11” WC - Max. 14” WC

Gas pressure below this specified range for the
T-H1 and/or insufficient gas volume will adversely
affect performance. Inlet gas pressure must not
exceed the above maximum values; gas pressure
above the specified range will cause dangerous
operating conditions and damage to the unit. Until
testing of the main gas line supply pressure is
completed, ensure the gas line to the T-H1 is
disconnected to avoid any damage to the
appliance.

Size the gas pipe appropriately to supply the
necessary volume of gas required for the T-H1
(NG 199,000 BTU/H; LPG 190,000 BTU/H) using
ANSI233.1/NAPA 54 in the USA or CAN/CSA
B149.1 in Canada or local codes. Install a manual
gas shut-off valve between the T-H1 and the gas
supply line. When the gas connections are
completed, it is necessary to perform a gas leak
test either by applying soapy water to all gas
fittings and observing for bubbles or by using a
gas leak detection device. Always purge the gas
line of any debris before connecting to the
appliance gas inlet.

Pipe Sizing Example: This table below is for
Natural gas piping supply straight to the
appliance without any tabs to other gas
appliances

Recommended Gas Pipe Size for
T-H1 Appliance (Example for NG)

Distance from Gas Meter Pipe Size (inches)

0' - 20' 3/4"

30' - 80' 1"

.

90' – 200’ 1-1/4"

- 10 -

Natural Gas Supply Piping

Maximum Capacity of Natural Gas Based on a 0.60 specific gravity at a 0.5” WC pressure drop

Pipe Size kBTU of Natural Gas

Length 10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’

¾” 372 255 205 175 156 142 130 121 114 107 95 86 74

1” 702 482 387 331 293 266 245 228 213 202 179 162 139
1 ¼” 1441 990 795 680 603 546 503 468 439 415 367 332 285
1 ½” 2158 1483 1191 1019 903 819 753 701 658 621 550 499 427

2” 4155 2856 2293 1963 1740 1576 1450 1349 1266 1195 1060 960 822

Propane (LP) Gas Supply Piping

Maximum Capacity of Propane (LP) Gas Based on 11” WC supply pressure at a 1.0” WC pressure drop

Pipe Size kBTU of Propane

Length 10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’

¾” 567 393 315 267 237 217 196 185 173 162 146 132 112

1” 1071 732 590 504 448 409 378 346 322 307 275 252 213
1 ¼” 2205 1496 1212 1039 913 834 771 724 677 630 567 511 440
1 ½” 3307 2299 1858 1559 1417 1275 1181 1086 1023 976 866 787 675

2” 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496 1260

WATER CONNECTIONS

FOR YOUR SAFETY, READ

BEFORE OPERATING:

Do not use this appliance if any part has
been submersed under water.
Immediately call a qualified service
technician to inspect the appliance and to
replace any damaged parts.

All pipes, pipe fittings, valves and other
components, including soldering materials,
must be suitable for potable water systems. A
manual shut off valve must be installed on the
cold water inlet to the appliance between the
main water supply line and the T-H1. In
addition, a manual shut off valve is also
recommended on the hot water outlet of the
unit. If the T-H1 is installed within, or subjected
to, a closed loop water system, such as one
having an anti-backflow device in the cold
water supply line, a thermal expansion tank
must be installed. Contact the water supplier or
local plumbing inspector on how to control this
situation.
After installation of the appliance is complete,
purge the water line to remove all the debris
and air from the line. Failure to do so may
cause damage to the appliance. There is a

wire mesh filter within the cold inlet to trap
debris from entering your appliance. This will
need to be cleaned periodically to maintain
optimum flow.

Unit Draining & Filter Cleaning Procedures

To drain your unit, please follow these
instructions carefully:

1. Turn off the power supply to the T-H1
Appliance.

2. Close the manual gas shut off valve
located on the gas supply line.

3. Close the manual water shut off valve
located on the water supply line.

4. Open all hot water taps in the house.
(Bathroom, kitchen, laundry room, etc.).
When the residual water flow has ceased,
close all hot water taps.

5. Have a bucket or pan to catch the water
from the unit’s drain plugs. Remove the
drain plugs to drain all the water out of the
unit.

6. Wait a few minutes to ensure all water has
drained from unit.

7. At this time, please check the water filter
located within the cold inlet. With a tiny
brush, clean the water filter of any debris
which may have accumulated and reinsert
the filter back into the cold water inlet.

8. Securely screw the drain plugs back into
place. Hand- tighten only

- 11 -

H

H

To re-start your appliance, follow these
steps:

1. Make sure all hot water taps are closed
and the drain plugs are securely attached.

2. Purge the water line of debris.

3. Open the manual water shut-off valve
located on the water supply line.

4. Open all the hot water taps to verify water
flows to the taps. Then close the hot water
taps.

5. Open the manual gas shut-off valve located
on the gas supply line.

6. Turn on the power supply to the T-H1
Appliance.

Note: Do not reverse the hot outlet and cold
inlet connections to the T-H1 Appliance. This
will not activate the appliance.

OT

COLD

GAS

COLD HOT GAS

Pressure Relief Valve

The FLASH T-H1 has a high-temperature shut
off switch built in as a standard safety feature
(called a Hi-Limit switch) therefore a “pressure
only” relief valve is required.
This unit does not come with an approved
pressure relief valve. An approved pressure
relief valve must be installed on the hot water
outlet. The pressure relief valve must conform
to ANSI Z21.22 or CAN 1-4.4 and installation
must follow local code.
The discharge capacity must be at least
199,000 BTU/H. The discharge piping for the
pressure relief valve must be directed so that
the hot water cannot splash on anyone or on
nearby equipment. Attach the discharge tube
to the pressure relief valve and run the end of
the tube to within 6" from the floor. This
discharge tube must allow free and complete
drainage without any restrictions.
If the pressure relief valve installed on the T­H1 discharges periodically, this may be due to
a defective thermal expansion tank or defective
pressure relief valve.
The pressure relief valve must be manually
operated periodically to check for correct
operation.

Condensate Drain

The T-H1 has a built-in condensed water
neutralizer cartridge that reduces the pH level
of any condensed water. Follow the code
requirements of the local authority having
jurisdiction regarding the disposal of
neutralized condensate. In the absence of
such regulations, Takagi suggests the
neutralized condensate can be disposed of into
a standard drain. Connect a drain tube from
the condensate water drain port (depicted
below) located on the underside of the unit to a
standard drain.

OT

COLD

GAS

Condensate
water drain

- 12 -

ELECTRICAL CONNECTIONS

WARNING: Follow the electrical code
requirements of the local authority having
jurisdiction. In the absence of such
requirements, follow the latest edition of the
National Electrical Code ANSI/NFPA 70 in the
U.S. or the latest edition of CSA C22.1
Canadian Electrical Code, Part 1, in Canada.

The appliance must be electrically grounded.
Do not attach the ground wire to either the gas
or the water piping. Plastic pipe or dielectric
unions may isolate the appliance electrically.

CAUTION: When servicing or replacing parts
within the T-H1, label all wires prior to
disconnection to facilitate an easy and error
free reconnection. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.

The FLASH T-H1 appliance requires AC 120V
60 Hz electrical power supply that is properly
grounded.

• An on/off switch controlling the main power
to the TH-1 must be provided for service
reasons;

• Connect the power supply to the TH-1
exactly as shown in the wiring diagram;

• A green screw is provided in the junction
box to ground the connection.

Wiring diagrams are also located on the
inside panel of the appliance.

INITIAL OPERATION

For your safety please read before

operating the unit for the first time.

Once you have properly installed the unit and
before firing it for the first time, check the gas
and water connections for leaks. Open the
main gas supply valve to the unit using only
your hand to avoid any spark. Never use tools.
If the knob will not turn by hand, do not try to
force it; call a qualified service technician.
Force or attempted repair may result in a fire or
explosion due to gas leaks. Be sure to check
next to the bottom of the unit because some
gases are heavier than air and may settle
towards the floor.

CAUTION: IF YOU SMELL GAS:

1. Do not try to start the appliance.

2. Do not touch any electric switch; do not
use any phone in your building.

3. Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.

4. If you cannot reach your gas supplier,

This appliance does not have a pilot light. It is
equipped with an electronic ignition device
which automatically lights the burner. Do not
try to light the burner manually. Check for
proper venting and combustible air to the
appliance. Purge the gas and water lines to
remove any air pocket. Do not use this
appliance if any part has been submersed
under water. Immediately call a qualified
service technician to inspect the appliance and
to replace any parts that have been under
water.

Once the above checks have been completed,
follow these steps to turn on your unit:

1. Close the manual gas control valve located

2. Fully open the manual water control valve

3. Open a hot water tap to verify that water is

4. Fully open the manual gas control valve

5. Turn on the 120 volt 60 Hz power supply to

call the fire department.

on the gas line.

on the water supply line.

flowing to that tap. Then close the hot
water tap.

installed.

the FLASH T-H1 appliance.

- 13 -

W

G

6. Now you are ready to enjoy hours of
endless hot water.

NORMAL OPERATION

To turn on your T-H1 appliance:

1. Open a hot water tap.

2. The burner ignites. The “Fire On” lamp
lights.

3. Mix cold water with the hot to get the
correct temperature water.

To turn off your T-H1 appliance:

1. Close the hot water tap

chart of typical household plumbing fixture flow
rates to determine what the FLASH T-H1 can
do in a household application.

Household Flow Rates

Appliance / Use

Lavatory Faucet 1.0
Bath Tub 4.0
Shower 2.0
Kitchen Sink 1.5
Dishwasher 1.5
Washing Machine 2.0

Taken from UPC 1997

Flow Rate

(GPM)

ARNIN

“Fire On” lamp extinguishes.

The flow rate through the FLASH T-H1 is
limited to a maximum of 10.2 GPM. The
temperature setting, along with the supply
temperature of the water will determine the
flow rate output of the unit. Please refer to the
temperature/gallons per minute chart at the
back of this manual to determine the likely flow
rates based on your local ground water
temperature and your desired outlet water
temperature combination.

Based on the United States Department of
Energy method of testing appliance output, the
T-H1 is rated for 285 gallons per hour (GPH),
or 4.8 gallons per minute (GPM), when raising
the water temperature by 77°F (for example
from 43°F to 120°F). Refer to the following

FLOW

Hot Appliance temperatures over 125°F
can cause severe burns instantly or death
from scalding. The outlet hot water
temperature of the FLASH T-H1 appliance

is factory set at 122°F. Feel the water
temperature before bathing or showering.
Do not leave children, the disabled or the
elderly unattended as they are at the
highest risk of being scalded.
Temperature limiting valves are available,
ask professional person.

- 14 -

TEMPERATURE SETTINGS

There are 4 preset temperatures that you can
select from by adjusting the dipswitch settings
on the computer board. The temperature has
been preset at the factory to122ºF (50ºC). The
computer will electronically control this
temperature. At a fixture, mix cold water with
hot to get the water temperature you desire. If
you desire a hot water temperature other than
the 4 preset settings, please purchase the
optional temperature remote controller (part
No. TM-RE10). With this optional TM-RE10
you can set the temperature from 99ºF to
182ºF. Please carefully read the instructions
prior to installing the TM-RE10 as failure to do

Temperature setting

Only change black switches. Do not adjust any another switches.

Installation setting

Only change black switches. Do not adjust any another switches..

so could damage the temperature controller
and/or the appliance, which will void the
warranty.

Hot Water Output Temperature Setting:

With the FLASH T-H1 Appliance, the output
hot water temperature can be adjusted either
manually from the main computer board’s
dipswitches or with the optional remote
controller (Part TM-RE10, from 99°F to 182°F).
The dipswitches can set four hot water output
temperatures 113°F, 122°F, 140°F, and 182°F
(the factory set temperature is 122°F).

- 15 -

FREEZE PROCTECTION DEVICES

This unit comes equipped with heating blocks
and automatic ‘no-flow’ burning to prevent
freezing which can damage the heat
exchanger. For this freeze prevention system
to operate, there has to be electrical power to
the unit. The freeze prevention devices will

not work if the electrical power source is
disconnected. Even if TM-RE10 in “off”
mode, it will be switched to “on”
automatically to prevent the heat exchanger
from freezing. Damage to the heat exchanger

caused by freezing temperatures due to power
loss is not covered under the warranty.

The unit has been rated for temperatures down
to 0ºF (-18ºC) in a wind free environment. If
you install the appliance in an area that is
subject to temperatures (including wind chill)
below 0ºF (-18ºC), this will void the warranty
and Takagi will not be responsible for any
damage to the heat exchanger as a result of
freezing. In any areas subject to freezing
temperatures, Takagi strongly recommends
the use of its back flow prevention flue damper
(Part No. TK-TV03) to reduce the amount of
cold air entering through the exhaust venting
when the appliance is off.

If you will not be using your appliance for a
long period of time or if the temperatures
(including the wind chill) will drop below 0ºF (­18ºC), turn off your appliance and drain the
unit of water (see ‘Unit Draining & Filter
Cleaning’ section above for draining
instructions). This will keep your unit from
freezing and being damaged.

For indoor installation in areas where the
temperature will be well below freezing for
extended periods of time, use the included
“Extension cable” to relocate the internal
thermostat located on the cabinet to the
outdoors. This will sense the ambient air
temperature and turn on the internal
appliance blocks on to prevent the heat
exchanger from freezing.

CAUTION: Only the pipes within the appliance
are protected by the anti-freeze devices on the
T-H1. Any hot or cold water pipes located
outside of the unit will not be protected.
Properly protect and insulate these pipes from
freezing.

MAINTENANCE AND SERVICE

WARNING: Turn off the electrical power
supply and close the manual gas control
valve and the manual water control valve
before servicing.

Do this immediately after installation.

1. Clean the cold-water inlet filter (figure
below).

2. Be sure that all openings for combustion
and ventilation air are not blocked.

3. Check that the exhaust vent pipe is not
blocked.

4. Check the gas pressure.

5. Keep the area around the appliance clear.
Remove any combustible materials,
gasoline or any flammable vapors and
liquids.

The unit should be checked once a year or as
necessary by a licensed technician. If repairs
are needed, any repairs should be done by a
licensed technician.

The following systems and parts should be
checked at least once a year:

1. Venting system

2. Burner

3. Manual operation of the pressure relief
valve to ensure correct operation.

4. Periodic cleaning of the water filter (figure
above).

5. Heat exchanger. Remove the thermistor
and check for a mineral coating. A mineral
coating on the thermistor requires flushing
the heat exchanger with a de-scaling
solution. Scale build up will void your

- 16 -

warranty and shorten the life of your
appliance.

Common Trouble Shooting

The T-H1 can burn gas at a maximum input
rate of 199,000 BTU/H. This puts a limit on the
possible output temperature and flow
capabilities. If the water doesn’t seem hot
enough, compare the flow and temperature
that is being attained to the T-H1 flow vs.
temperature chart (See flow chart on the last
page of this manual). If the unit is not
performing according to the chart, first check
that the gas supply pipe is sized properly and
that the gas pressure is within the required
range. If the gas line is sized properly, check
the plumbing for mixing valves, thermostatic
valves, anti-scald devices, single handled
faucets with built in temperature or pressure
compensators valves and hot and cold crossed
connections. If the unit is performing in
accordance with the flow chart, it may be
undersized for the application. If the unit is
performing according to the chart, the output
temperature can be adjusted using the TM­RE10 or the dipswitches on the unit.

It Takes Too Long to Get Hot Water

The T-H1 takes three seconds to ignite and
three more seconds to heat the incoming
ground water up to the set temperature. The
time it takes to deliver hot water from the T-H1
to your fixtures depends on the length of piping

damage. If you have installed a combination
system (a T-H1 doing both domestic hot water
and space heating), completely isolate the
heating system temporarily to ensure flow is
not backfeeding through your heating system
to supply the domestic water (by-passing the
T-H1).
If neither of those remedies start the unit, press
the lower grey button marked “test (off)” on the
GFCI inside the unit. If the red light above it
does not come on, there is a problem with the
electrical supply to the unit. If that red light
does come on, hit the “reset (on)” button and
open a hot water faucet to re-try the unit. If the
problem persists, contact Takagi for
instructions.

ERROR CODES

All Takagi units are self diagnostic for safety
and convenience when trouble shooting. If
there is a problem with the installation or the
unit, it will display a numerical error code on
the TM-RE10 (if installed) or at the bottom left
corner of the computer board to communicate
the source of the problem. Consult the
following chart for the cause of an error code:

The T-H1 consists of five major control
operations: Temperature control, Gas control,
Water control, Burner Control, and Main
computer control

.

between the two. The longer the distance, the
more time it will take. If you would like to
receive hot water to your fixtures quicker, you
may want to consider a hot water recirculation
system.

The T-H1 Will Not Initiate

Error Code as
Three digit Numeric
numbers

First check the flow rate through the unit. If the
flow is less than .75 GPM, the unit will not
initiate. Check the filter for any debris or

ERROR CODE CHART:

Error Symptom Error Symptom Error Symptom

031 Wrong Gas Type 391 Abnormal Thermocouple 741
101 Insufficient Gas Supply 510 Abnormal Main Gas Valve
111 Ignition failure 611 Abnormal Fan Motor

751

121 Flame Loss 651 Abnormal Bypass Valve 761 Multi-system Controller
211 Vent Pipe Obstruction 661
311

Output Thermistor Failure

701 Abnormal Mixing Thermistor

Abnormal Output Adjustment Valve

921

321 Inlet Thermistor Failure 711 Abnormal Gas Solenoid Valve 931 Neutralizer error
331

Mixing Thermistor Failure

721

Computer Pre / Post Check Problem

991 Abnormal Burning

Main remote control Trouble

Temperature Remote

control Trouble

Neutralizer ‘Replacement

Needed’ warning

- 17 -

Wiring Diagram

A wiring diagram is located on the inside front panel of the appliance.

Electrical Rating: 120 VAC, 60 Hz, 0.8 A.

Note: If any of the original wiring supplied with this appliance must be replaced, it must be replaced with appliance wiring material (180c)

or its equivalent. Replacement wires are available through Takagi.

- 18 -

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of
life.

A. This appliance does not have a pilot. It is equipped with an ignition device that

automatically lights the burner. Do not try to light the burner by hand.

B. BEFORE OPERATING smell all around the appliance area for evidence of leaking

gas. Be sure to smell next to the floor because some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL GAS.

• Do not try to light any appliance.

• Do not touch any electric switch, do not use any phone in your building

• Immediately call your gas supplier from a neighbor's phone. Follow the gas

supplier's instructions.

• If you cannot reach your gas supplier, call the fire department.

C. Use only your hand to turn the gas valve knob. Never use tools. If the knob will not

turn by hand, don't try to repair it. Call a qualified service technician. Force or
attempted repair may result in a fire of explosion.

D. Do not use this appliance if any part has been under water. Immediately call a

qualified service technician to inspect the appliance and to replace any damaged
parts.

OPERATING INSTRUCTIONS

1. STOP! Read the safety information above or in the Owners Manual.

2. Turn off all electric power to the appliance.

3. Do not attempt to light the burner by hand.

4. Turn the gas manual gas valve located on the outside of the unit clockwise ↻ to the
off position.

5. Wait five (5) minutes to clear out any gas. If you then smell gas. STOP! Follow "B"
in the safety information above on this label. If you don't smell gas, go to next step.

6. Turn the manual gas valve located on the outside of the unit counter clockwise ↺
to the ON position.

7. Turn on all electrical power to the appliance.

8. If the appliance will not operate, follow the instructions “to Turn Off Gas to
appliance" and Call your service technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

1. Turn off all electric power to the appliance if service is to be performed.

2. Turn the manual gas valve located on the outside of the unit clockwise ↻ to the off
position.

- 19 -

W

p

DANGER

Vapors from flammable liquids will explode and catch fire causing death or severe burns.

Do not use or store flammable products such as gasoline, solvents or adhesives in the

same room or area near the appliance.

Keep flammable products:

1. Far away from appliance.

2. In approved containers.

3. Tightly closed

4. Out of children's reach

WARNING: Do not install water heater where flammable products will be stored.

Read and follow water heater warnings and instructions. If owner's manual is
missing, contact the retailer or manufacturer.

Vapors:

1. Cannot be seen

2. Vapors are heavier than air

3. Go a long way on the floor

4. Can be carried from other rooms
to the main burner by air currents.

ARNING

The outlet hot water temperature of the T-H1 appliance is factory set at 122 °F.

WARNING: Use this appliance at your own risk. The set outlet water temperature can

cause severe burns instantly or death from scalds. Test the water before bathing or

showering. Do not leave children or the infirm without supervised.

WARNING: California Proposition 65 lists chemical substances known to the state to
cause cancer, birth defects, death, serious illness or other reproductive harm. This product
may contain such substances, be their origin from fuel combustion (gas, oil) or
components of the product itself.

DANGER

Hot Appliance temperature over 125 °F can cause severe
burns instantly or death from scalding.
Children, disabled and elderly are at the highest risk of
being scalded. Feel water temperature before bathing or
showering. Temperature limiting valves are available, ask

rofessional person.

- 20 -

Applications

Space Heating Applications

The T-H1 can be used for potable hot water heating applications as well as space heating applications.

WARNING

• Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol group

must not be introduced into the system when used for open loop potable water and
space heating.

• The FLASH T-H1 can be used to supply potable water and space heating and shall not

be connected to any heating system or component(s) previously used with non-potable
water where any chemicals were added to the water heating appliances.

• When the system requires water for space heating at temperatures higher than required

for other uses, a means such as a mixing valve shall be installed to temper the water for
those other uses in order to reduce scald hazard potential.

• Water temperature over 125 °F can cause severe burns instantly or death from scalds.

• Chemicals such as diluted Glycol can be used for radiant floor, Hydro/fan coil air or

Baseboard heating only.

Basic System Drawings and Schematics

Heating application only:

Warning: This illustration is a concept design only. There are a wide variety of variations to the application
of controls and equipment presented. Designers must add all necessary safety and auxiliary equipment to
conform to code requirements and design practice. For more details, contact the Takagi Technical
Department at [phone]

- 21 -

Dual Purpose Hot Water Heating

(Domestic Hot Water and Space Heating Combination System)

Priority Control Devices such as a flow switch, an Aquastat or other electronic controller can be

used to prioritize the domestic water system over the heating system.

Warning: Follow all local codes, or in the absence of local codes, follow the most recent edition of
the National Standard Code, ANSI Z21. 10.3. or ANSI Z21. 13.

Warning: This illustration is a concept design only. The reference to the 1/8th hole in check is only
for the State of Massachusetts. There are a wide variety of variations to the application of controls
and equipment presented. Designers must add all necessary safety and auxiliary equipment to
conform to code requirements and design practice. For more details, contact the Takagi
Technical Department at [phone]

- 22 -

T-H1 with Storage Tank

This illustration is a concept design only. The maximum flow rate through the T-H1 is 10.2 GPM. If it is

necessary to achieve higher flow rates with full pressure for longer periods of time, then it can be installed
in conjunction with a storage tank. A pump will be necessary to keep the storage tank water hot. We
suggest a high-head pump of 1/12 hp or greater depending on the system.

Recirculation

This illustration is a concept design only. This system will also need a high-head pump of 1/12 hp or
greater, depending on the application situation.

- 23 -

Optional Items

1. TM-RE10 Temperature Remote Controller

The TM-RE10
Temperature Remote
Controller has two
functions. It allows the
output temperature
from the T-H1 to be

adjusted within the
range of 99°F to 182°F, and it also works as a
diagnostic tool that will give a concise error code
whenever there is a problem with the unit. The
temperature options are 99°F, 100°F, 102°F,
104°F, 106°F, 108°F, 109°F, 111°F, 113°F,
115°F, 117°F, 122°F, 131°F, 140°F, 158°F,
167°F, and 182°F. See the trouble shooting
section for information on possible error codes.

3. TK-TV03 Vent Damper

The TK-TV03 Vent
Damper prevents the
backflow of air through
the exhaust vent. This is
a CSA tested Takagi
component. This helps

prevent harmful exhaust
gases from entering the home, as well as helping
to prevent the units

from freezing in areas where
cold air can be blown or drawn into the exhaust
system. Install this vent damper in accordance
with Takagi’s installation instructions and any
applicable codes.

5. TK-TV07 Direct Vent Conversion Kit

This kit can be used convert
the T-H1 from a conventional
vent system to a direct vent
(or sealed combustion)
system. This is a CSA tested

Takagi conversion kit. Install
this conversion kit in accordance with Takagi’s
installation instructions and any applicable codes.

2. TK-TV01 Vent Terminator

This terminator can be used
where a T-H1 is going to be
vented out through a wall. This
is a CSA tested Takagi
component. Connect the
Category III stainless steel vent

pipe from the top of the unit to
the backside of this terminator to exhaust flue
gases through the wall without a thimble. Install
this vent terminator in accordance with Takagi’s
installation instructions and any applicable codes.

4. TK-TV05 Direct Vent Terminator

This terminator can be used
where a T-H1 is going to be
vented out through a wall.
This is a CSA tested Takagi
component. Connect the
Category III stainless steel
vent pipe from the top of the

unit to the backside of this
terminator to exhaust flue gases through the wall
without a thimble. Install this vent terminator in
accordance with Takagi’s installation instructions
and any applicable codes.
Exhaust vent pipe use Cat III 4” and intake air 3”

6. TK-TV08 Vent Cap

The TK-TV08 Vent Cap
is used when the T-H1
appliance is to be
installed outdoors. The

cap is installed over the
flue collar, instead of connecting an exhaust vent.
The cap will prevent any debris that from entering
the unit and causing a fire hazard or damage, as
well as preventing rain or snow from entering the
unit.

- 24 -

Comp

Components Diagram

Case assembly

Neutralizer assembly

- 25 -

y

Burner assembl

- 26 -

Water way assembly

- 27 -

y

Computer board assembl

- 28 -

Part No. Part name

Parts List

109 Rod cap

1 Case Assembly

2 Intake air plate

3 Front cover

4 Back Guard Panel

5 Bracket

6 Screw M4X10

7 Coating screw M4X10

8 Coating screw w/washer M4X12

9 Hose band

10 Drain income hose

11 Neutralizer thermistor

12 P screw M4X10

13 Neutralizer cover

14 Neutralizer gasket

15 Fixing ring

16 P screw M4X16

17 Neutralizer support plate

110 Flame rod code

111 Igniter code

112 Wire clamp

113 Screw M4X14

114 Damper

115 Manifold

116 Manifold pressure port

117 Joint packing A

118 Joint packing B

119 Gas joint

120 Screw w/washer M4X12

121 O-ring P18

122 O-ring P22

123 Gas proportional valve

124 Gas valve wire

125 Proportional valve wire

126 Chamber pressure port

18 Neutralizer fixing plate

19 Neutralizer case

20 Neutralizer drain plug

21 Cap nut

22 Neutralizer drain hose

23 Surface appliance

24 One touch band

25 Condensation drain

26 Neutralizer

101 Burner assembly

102 Rod gasket

103 Flame rod

104 Igniter rod

105 Thermo couple

106 Rod fixing plate

107 Rod window

108 Pan screw M4X6

127 Chamber pressure pipe

128 O-ring P28

129 Screw w/washer M4X8

130 Gas inlet fixing plate

131 Coating screw w/washer M4X10

132 Gas inlet

133 Gas valve plate

134 Screw w/washer M4X8

135 Hex head screw w/seal

136 Fan motor

137 Hex head screw M4X12

138 Silicon tube

139 Pressure switch pipe

140 Pressure plate

141 Pressure switch port pipe

142 Combustion Chamber

401 Silicon ring

- 29 -

402 Heat exchanger assembly

403 Out thermistor

404 O-ring P4

405 Fastener set “4-11”

406 Hi-limit switch

407 Pan screw M3X6

408 Pipe appliance

409 Pipe appliance fixing plate

410 Over heat cut off fuse fixing plate

411 Over heat cut off fuse

412 Heat exchanger fixing plate

413 Screw M4X10

414 Fastener set “16A”

415 O-ring P16

416 Heat exchanger existing pipe

417 O-ring JASO#1017

434 O-ring P15

435 Screw M4X6

436 Cement appliance

437 Cement appliance fixing plate

438 O-ring P6

439 Fastener “8”

440 Drain port

441 Pipe drain plug

442 Water outlet

443 Mix thermistor

444 Outlet drain plug

445 O-ring P6

446 Screw w/washer M4X6

701 Computer board

702 GFI

703 AC100V wire

418 Flow adjustment valve

419 Flow sensor

420 O-ring JASO#1016

421 Stainless heat exchanger out pipe

422 Stainless heat exchanger

423 S coat screw M4X10

424 Header

425 Pan Screw M4X8

426 O-ring P4

427 In thermistor

428 P screw M4X10

429 Stainless heat exchanger in pipe

430 Water inlet

431 Appliance

432 Filter

433 Inlet drain plug

704 Transformer connecting wire

705 Wire clamp 60

706 Remote controller terminal

707 Wire clamp 110

708 Computer board plate

709 Igniter

710 Pan screw M4X12

711 Screw M3X12

712 Transformer TD-227

713 Pressure switch

714 Freeze protection thermostat

715 Junction box

716 Nylon clamp

717 Fuse

719 Computer board cover

- 30 -

- 31 -

Out Put Temperature vs. GPM (Max. 10.2 GPM) with Various Ground Water Temperature

Correct Gas pipe size can be expect this chart

0.0

2.0

4.0

6.0

8.0

10.0

12.0

Out put Hot Water Temperature

Out Put Hot Water GPM

40 F 50 F 60 F 70 F

40 F

7.36.76.15.65.24.94.64.34.13.93.73.33.12.92.82.72.6

50 F

9.28.17.36.76.15.65.24.94.64.34.13.73.33.23.12.92.8

60 F

10.2 9.2 8.1 7.3 6.7 6.1 5.6 5.2 4.9 4.6 4.1 3.7 3.5 3.3 3.2 3.1

70 F

10.2 9.2 8.1 7.3 6.7 6.1 5.6 5.2 4.6 4.1 3.9 3.7 3.5 3.3

90 95 100 105 110 115 120 125 130 135 140 150 160 165 170 175 180