MOBIUS Water Heater Takagi Industrial Co. USA, Inc.
Installation and Operating Instructions
MOBIUS WATER HEATER
MODEL T - M1
Instantaneous Tankless Gas Water Heater
Suitable for
Potable water heating and Space heating
Indoor and Outdoor installation
FEATURES
θ ENDLESS HOT WATER SUPPLY
θ ON-DEMAND
θ PILOT LESS SYSTEM
θ COMPACT, SAVE SPACE
θ COMPUTER CONTROL
θ COMPUTERIZED SAFTY
θ CONSERVES ENERGY
θ FULL CAPABILITY FOR MANIFOLD
Store these instructions next to the hot water heater for reference purposes.
TAKAGI INDUSTRIAL CO. USA Inc.
6 Goddard, Irvine, CA 92618
Tel. (949) 453 - 8388, FAX. (949) 453-8498
http://www.takagi-usa.com
FOR YOUR SAFETY - READ BEFORE OPERATING
Thank you for purchasing this water heater. Properly installed and maintained,
it should give you years of trouble free service. Read this installation manual
before system install to application whether with or without experience with
Takagi Tankless Gas water heather.
Do not copy this installation manual without consent from Takagi
Industrial Co. USA Inc. Copy Right 2002, Takagi Ind ustrial Co. USA Inc.
FOR YOUR SAFETY - This p roduct must
be installed and serviced by a professional
service trained technician. Improper
installation and/or operation could create
carbon monoxide gas and flue gases, which
could ca use serious injury or death. Improper
installation and/or operation will void the
warranty.
WARNING:
manual is not followed exactly, a fire or
explosion may result, causing property
damage, personal injury or death.
• Do not store or use gasoline or other
flammables, vapors and liquids in the
vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
• Do not try light any appliance.
•
•
•
• Only a Licensed contractor or plumber,
trained technician, certified installer and
service agency should perform installation
and/or service this unit otherwise warranty
will void from manufacture.
If the information in this
Do not touch any electrical switch,
also do not use any phone in your
building.
Immediately call your gas supplier
from a neighbor’s phone. Foll ow the
gas supplier’s instructions.
If you cannot reach your gas
supplier, call the fire department.
WARNING: To install this unit correctly, you
must follow the procedures listed in this
manual . Fail ure to do s o will vo i d any and all
warranties offered by Takagi Industrial Co.
USA, Inc.
Do not make any changes to the water
heater, or to its gas controls, gas orifices,
wiring or draft. Any modifications may void
the warranty. If the unit must be modified
because of special conditions or
circumstances, consult the manufacture or
factory representative before making any
changes.
1
CONTENTS
For Your Safety …………. 4
Operation …………. 5
• General …………. 5
• Temperature …………. 5
• Freeze Prevent Device …………. 6
• Winterizing …………. 6
Installation …………. 7
• General …………. 7
• Accessories …………. 8
• Optional Items …………. 8
• Outdoor Installation .………… 8
• Indoor Installation …………. 9
• Combustion Air Supply …………..9
• Venting Instructions …………..10
• Gas Supply …………. 12
• Water Connection …………. 13
• Pressure Relief Valve …………. 14
• Electrical Connection …………. 14
Starting Operation …………. 15
Operating Instruction …………..15
Wiring Diagram …………..17
For your Safety …………..18
Application …………..20
• Space Heating …………..20
• Dual-purpose heating …………..21
• Storage Tank …………..22
Natural Gas Input Min. 25,000 Btu
Max. 235,000 Btu
LPG Input Min. 25,000 Btu
Max. 225,000 Btu
Gas Connection ¾” NPT
Water Connection 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 2.2” WC
Propane 2.7” WC
Weight 70 lbs.
Dimensions 24.5”x16.5”x8.3”
Ignition Electronic Ignition
Electrical Supply AC 120 V
• Re-Circulation …………..22
Temperature Setting …………..23
Manifold Multi Sys tem …………..23
Maintenance and Service …………. 27
Error codes ……...28, 32
Trouble Shooting …………. 29
Component Diagram …………..33
Part List …………. 37
Output temperature Chart …………..39
• Inlet gas pressure must not exceed the
above maximum values.
• For gas pressures lower than 5” WC for
natural gas and 11”WC for propane, call
the manufacturer.
• Before installing in areas over 4,500 feet
above sea level, contact the manufacturer
for high altitude adjustment instructions.
• Check the rating plate to insure this product
matches your specifications.
• Takagi - USA is constantly improving our
products; therefore specifications are
subject to change without prior notice.
1
SPECIFICATIONS
***
INTRODUCTION
This manual provides information necessary
for the in stalla tion , oper atio n, and ma inte nance
of the MOB IUS Model T -M1 wate r heate r. This
unit includes a power fan for power venting
system, and an advanced electronic ignition
system.
The model designation is listed on the rating
plate, which is attached to the front of the
water heater. Please read all application and
install a tio n pr oc e dur e s com p let e ly before doi ng
the installation. If you have any problems or
questions regarding this equipment, consult
the Takagi Industrial Co. USA, Inc. or local
factory representative. Experiences have
shown that most operating problems are
trained technician or Gas Company or
manufacturer.
6. WARNING: Do not disconnect the
electrical supply if the ambient
temperat ure s wi ll be r eachi ng fr eezi ng. Th e
Freeze Pr eventi on Device on ly works i f the
unit has proper electrical power. The
Freeze Prevention Device is rated for
temperatures down to 5ºF (-15ºC) in a wind
free environment. The wind chill factor will
cause the MOBIU S Water Heate r to freeze
and be damaged at temperatures below
5ºF (-15ºC). Refer to the section on
Winterizing and Freeze Prevention Device
for more information. Warranty will not be
covered if the heat exchanger is damaged
by weather. Please read winterize section
in this installation book.
caused by improper installation (human error).
7. WARNING: Before bathing or showering
FOR YOUR SAFETY
FOR YOUR SAFETY, PLE ASE READ THI S
MANUAL CAREFULLY AND FOLLOW ALL
DIRECTIONS.
1. Follow a ll local code s, or in the a bsence of
local codes, follow the most recent edition
of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 in USA or the CGA
standard, CAN/CGA B149.1 or .2
Installation Codes for Gas Burning
Appliances 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.
always check the water temperature. Do
not leave children or infirm person
unsupervised in the shower or bath. The
water temperature is set at 140ºF (60ºC)
from the f actor y to ma ximize t he amo unt of
hot water you can use without an optional
temperature remote controller, Water
temperature over 125ºF can cause severe
burns instantly or death from scalding.
8. WARNING: Do not use this appliance if
any part has been contacted or been
immersed water. Immediately call a
certified, trained technician or manufacture
to inspect and/or service the unit if
necessary.
9. WARNING: Do not store o r us e gas oli ne or
other flammables, vapors and liquids in the
vicinity of this or any other appliance.
3. Carefully plan where you intend to install
your MOBIUS Water Heater. Insure that
your heater will have enough combustible
air, 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
10. WARNING: Do not reverse the water
and/or gas connections, this will damage
the heat exchanger and can cause severe
injury or death from scalds. Following the
diagram below when installing your
MOBIUS water heater.
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 in s t all.
5. If any problem should occur, turn off all hot
water tap s and turn of f the gas. T hen call a
RATING PLATE
Pressure relief Valve
HOT COLD GAS
GENERAL
The MOBIUS Water Heater is an
instantaneous, tankless water heater designed
to supply endless hot water to your entire
household and/or commercial hot water needs
utilizing total efficiency. The principle behind
the MOBIUS Water Heater is simple. Once you
open a hot water tap, water flows through the
MOBIUS Water heater. Once a minimum of
0.75 GPM is achieved the flow sensor
automatically commands the computer to
electronically turn on the fan, activate the
electronic igniter and open the gas valve the
computer monitors the water temperature,
water flow rate, and gas flow the insure you get
the right amount of hot water with the correct
hot water temperature. After the burners are
ignited the “fire on” lamp is lit. Computer will
modulate gas supply to valve and water flow.
0.75 gall ons per minute i s required to tu rn the
burners on, after the burners are ignited, the
flow rate can be lowered to 0.6 gallons per
minute to maintain and still keep the heater on.
It is advisable to increase the cold tap rather
than decreasing the hot tap to adjust the water
temperature. Now 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.
Temperature
The temperature has been set at the factory
Max. of 140º F (60º C). The computer will
electronically control this temperature. Mix the
cold water with hot to get the water
temperature you desire. If desiring hot water
temperature want other than factory setting
temperature (140ºF), please purchase the
optional temperature remote controller, part No.
TM-RE10. With this optional part TM-RE10 you
can set the temperature from 95 º F to 176 º F,
please carefully read the instructions prior to
installation, failure to do so can damage the
temperat ure contr olle r and/ or th e water hea ter s
onboard computer, which will void warranty.
WARNING: Temperatures above 125º F (52º
C) can cause severe burns or death from
scalding. Children, disabled and the elderly are
at high risk of being injured. Feel the water
temperature before bathing or showering. Do
not leave children, disabled and the elderly
without supervision. MOBIUS water heater will
produce hot water based on setting
temperature. Please refer to the temperature
and gallons per minute chart on the back of
this manual for your convenience.
Freeze Prevention Devices
This uni t com es e qui pped wit h h eat er bl ocks 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. Damage to the heat exchanger
caused by freezing due to electric power
outage is not covered under warranty.
The freeze prevention devices will not work
if the electrical power source is
disconnected.
The unit has been rated for temperatures down
to 5º F (-15º C) in a wind free environment.
The wind chill factor will cause the unit to
freeze at temperatures above 5º F (-15º C).
Do not install the water heater in an area with
extremely cold weather, this will void warranty
and Takagi-USA will not be held responsible
for any damage occurring from such
environment. For this purpose a back flow
prevention kit (Part TK-TV03) is highly
recommended for areas with freezing weather,
to prevent freezing air from entering through
the exhaust venting when the water heater is
on standby which can damage the heat
exchanger.
CAUTION: The pipe heaters are located on
the MOBIUS Water Heater only. Any hot or
cold water pipes located outside of the unit will
not be protected. Properly protect and insulate
these pipes from freezing.
Winterizing
If you will not be using your heater for a long
period of time or if the temperatures will drop
below 5º F (-15º C) with the wind chill factor,
turn off your heater and drain the unit of water.
This will keep your unit from freezing and being
damaged. Follow these instructions carefully:
1. Turn off the power supply to the Flash
Water Heater.
2. Turn off the manual gas control valve
located outside your heater.
3. Turn off 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 water flow has ceased, close all
hot water taps.
5. Have a bucket or pan to catch the water
from the units drain plugs. Remove the
drain pl ugs to drain all th e water out of t he
unit.
6. Wait a few minutes to ensure all water
have drained from unit.
7. At this time please check the water filter
located inside the cold inlet. With a tiny
brush, cl ean the water fil ter of any calci um
or debris which may have accumulated
over time and reinsert the filter back into
the cold water inlet.
8. Securely screw the drain plugs back into
place.
Now when you want to use your heater
again follow these steps:
Make sure all hot water taps are closed and
the drain plugs are securely attached.
1. Purge the water line of debris.
2. Turn on the manual water control valve
located on the water s upply line.
3. Open all the hot water taps to verify water
flows to the taps. Then close hot water taps.
4. Turn on the manual gas control valve
locate d on the gas suppl y li ne .
5. Turn on the power supply to the MOBIUS
Water Heater.
Drain Drain and Filter
INSTALLATION
This section is for the installer. The installer
is responsible for the correct installation of
your MOBIUS Water Heater.
For Your Safety: Only a certified and
trained service technician or qualified
plumber may service or install your product.
General
All gas water heaters require careful and
correct installation to insure safe and efficient
operation. This manual must be followed
exactly. Read the “For Your Safety” section in
the beginning of this manual.
1. T he regulator is preset at the factory,
this 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. Avoid installing the unit in an area with
high level of dust, sand, debris such as
flower within a bakery shop which can
become airborne can enter and buildup
within the fan causing damage to the
fan and/or burner. So please take
precaution to prevent such foreign
matter from entering the unit.
5. Impure particles from these objects
may clog the air vent or reduce
functio ns of the rotating fan and ca use
gas not to burn properly. Regular
maintenance is recommended for these
types of envir o nment.
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.
Accessories
Check that all parts listed below were include d
with the unit.
Installation Manual, Warranty Card and
Optional Part Information
Optional It e m s
1. TM-RE10 Temperature Remote Controller
thimble. Install vent terminator in accordance
with manufacturer’s installation instructions
and any applicable local codes.
3. TK-TV03 Vent Damper
The TK-TV03 Vent Damper prevents the
backflow of air through the exhaust vent. This
is CSA approved part of the unit. This helps
prevent harmful exhaust gases from entering
the home, as well as helping to prevent the
units fr om freezing in areas where cold air can
be blown into the exhaust system. Install vent
damper according to manufacturer’s
installation instruction, and any applicable
codes.
4. TM-TV06 Vent Cap
The TM-RE10 Temperature Remote Controller
has two functions, it allows the output
temperature from the T-M1 to be adjusted
within the range of 95 °F to 167 °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 95°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 176°F for
180°F. See the trouble shooting section for
information on possible error codes.
2. TK-TV01 Vent Terminator
This terminator can be used where a T-M1 is
going t o be v ent ed o ut thr oug h a wall . T his is a
CSA approved part of the unit. Connect a
Category III Stainless vent pipe from the top of
the unit to the backside of this terminator to
exhaust flue gases through the wall without a
The TM-TV06 Vent Cap is for outdoor
installation with the T-M1 water heater. The
cap is inst a ll ed o n th e t op of t h e uni t , in st ea d of
connecting an exhaust vent. The cap will
prevent any debris that might be in the
environment from entering the unit and causing
damage or a fire hazard, as well as preventing
rain or other weather from entering the unit.
OUTDOORS INSTALLATION
Follow all local codes and in the absence of
local co des, f ollow t he Nati onal Fu el Gas C ode
ANSI Z221 .23 in US A or in Can ada CAN/CGA
B149.1 or .2 Installation of Gas Burning
Appliances.
Locate the water heater in an open, unroofed
area, and maintain the following minimum
clearances. MOBIUS water heater is wall
hanging installation only.
Piping side (Bottom) 12”
Front (Maintenance
space)
Back of heater 1”
Top of heater 36”
24”
Do not install this water heater under an
overhang, less than 3 feet from its top or eaves.
The area under an overhang must be open to
three sides
WARNING: In the USA, do not install the water
heater vent terminator within 4 feet of any air
intake opening into a building. In Canada do
not install the water heater vent terminator
within 10 feet of any air intake opening into a
building.
WARNING: Do not have the vent terminal
pointing toward any opening into a building. Do
not locate your heater in a pit or location where
gas and water can accumulate.
WARNING: Do not install the heater where
water, debris, or flammable vapors may get
into the flue terminal. This may cause damage
to the heater. Warranty will void.
WARNING: Improper installation can cause
nausea or asphyxiation from carbon monoxide
and flue gases which could result in severe
injury or death. Improper installation will void
product warranty. For high altitude installation
above 4, 500 f eet , Con tact t he m anuf acture r on
how to handle this situation.
INDOOR INSTALLATION
Combustion Air Supply
The water he ater location mus t pr ov i d e e nou gh
air for pr oper c ombusti on and v entilati on of t he
surrounding area. See the latest edition of
ANSI Standard Z223.1 or any your local codes
that should be applicable. In general these
requirements specify that if the unit is installed
in a confined space, there must be permanent
air supply opening.
Minimum recommended Air supply to water
heater
Water
heater size
Max.
Outside air
area
Inside air
area
59 Sq. IN 235 Sq. IN
235.000
BTU
Air Supply from Outside Building
When combustion air supplied directly through
an outside wall, such as intake louvers
openings into the dwelling, opening should
give a minimum free area of one square inch
per 4000 BTUH inputs of the total input rating
of all appliances in the enclosed area.
Air Supply from Inside Building
When combustion air is supplied from inside
the building, each opening of the closet door
should have a minimum free area of one
square inch per 1000 BTUH input of the total
input rating of all appliance in the enclosed
area. These openings should never be less
than 100 Sq. in.
Combustion Air Supply from Mak e up air
Fan.
MOBIUS water heater is equipped with a
combustible air sensor that will shut off the
MOBIUS when inadequate combustible air
supply to unit is detected, MOBIUS water
heater will stop until it has enough combustible
air.
Any equipment, which exhausts air from the
room around the unit, can deplete the
combustion air supply. Such equipment can
also reve rse the action of the v enting sys tem.
This could cause flue products to accumulate
in the space where the water heater is installed.
Additionally air must be supplied to
compensate for any exhaust effect.
If a fan blower is used to supply air to the water
heater 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 water heater, a switch or equivalent
devices must be wired into the water heater
control ci rcuit or proper devic es to prevent the
water heater from firing unless the blower is
operating.
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 dea t h.
This water heater must be vented in
accordance with "Section Venting of
Equipment ", of t he latest ed it io n of the Na ti o n al
Fuel Gas Code, ANSI Z223.1 and all
applicable local building codes. In Canada,
follow CAN/CGA installation codes.
general rules for venting the MOBIUS water
heater.
1. Place the water heater as close as
possible to the vent.
2. The vent collar on the water heater
must be fastened directly to an
unobstructed vent pipe.
3. Do not weld the vent pipe to the water
heater collar. The weight of the stack
must not r est on the water he ater. The
top of the water heater must be easily
removable for normal service and
inspection of the unit.
4. The water heater vent must not be
connected to a fireplace, wood stove or
other equipment.
5. Avoid terminating the water heater vent
near any air-conditioning or air-supply
fans. 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.
6. Avoid using an oversized vent pipe or
using extremely long runs of the pipe.
This may cause excessive cooling and
condensation of flue gases resulting in
damage to the heat exchanger and are
not covere d unde r war r a nty.
Exha ust Vent
This water heater must be vented in
accordance with the section on venting of
equipment in the latest edition of the National
Fuel Gas Code.
This is a Category III appliance, and must be
vented accordingly. The vent system must be
gas tight. All seams and joints must be sealed
with silicone sealant or preferably high heat
resistant, UL listed aluminum adhesive tape
having a mi ni m um temperatur e rat i n g of 350 º F .
For best results, a horizontal vent system
should be as short and straight as possible
with Single wall Stainless steel vent pipe or
other approved, noncombustible, corrosionresistant material. The following are UL listed
manufacturers: ProTech Systems, FasNSeal,
Z-Flex Inc. Z-Vent II and Heat-Fab Inc. Saf-T
Vent. This unit requires 4” vent pipe. Connect
the vent pipe to the unit so that it is sealed
airtight. Follow the vent pipe manufacturer’s
instructions when ins talling the vent pipe. Do
not common vent this app lianc e with any other
vented appliance. The venting system must not
exceed a length of 35 ft. minus 5 ft. for every
elbow. Do not use more than 3 elbows.
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.
Fan assisted appliances should follow the
requirement as indicated in the latest edition of
ANSI Z233.1/NFPA 54.
The entire vent system must not exceed the
size specified in table below.
Diam
eter
Max.
No. of
Elbow
Max. Vertical or
Horizontal run in
Length
4” 3 Ea. 35 ft
For each elbow added, deduct 5 ft. from
max. Vent length.
Indoor installation clearance.
Piping side (Bottom of water
Min. 12”
heater)
Front (Maintenance space) Max. 24”
Min. 4”
Back of heater 1”
Non piping sides (Side of
Min. 1”
water heater)
Top of heater 12"
Vent Termination
A sidewall vent terminal must be used when
the water heater is vented through a sidewall.
Manufacture's recommend to use Takagi USA parts No.TK-TV01 as a vent terminator.
The vent terminal 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 CAN/CGAB149 and local applicable codes.
Locate the vent terminal so that it cannot be
blocked by snow. Most codes require that
terminat ion be at least 12 i nches above gr ade,
but the installer may determine if it should be
higher depending on job site condition and
applicable city code.
No. of Elbows Max. Vertical or
Horizontal Length
0 35 ft.
1 30 ft.
2 25 ft.
3 20 ft.
When the horizontal vent run exceeds 5 ft. the
following criteria must be observed;
• Attach a vertica l pipe a t least 2” high t o the
water heater outlet before the horizontal
run.
• Support the vent run at 3 ft intervals with
overhead hanger.
• Pitch up the vent run toward the vent
terminal at a rate of 1/ 4” per foot.
Installation vent terminator Clearance
Gas Supp ly and Gas P i p i n g Sizing
This unit needs a manual gas control valve
(System S hutof f V alve ) tha t m ust be pl aced on
the unit before it is connected to the gas line.
Check the gas inlet pressure and the type of
gas matches the rating plate located on your
water heater. Insufficient gas pressure and
volume wil l cause your MOBIU S Water Heater
to be inefficient performance and not work
properly. Sizing of gas piping system correctly
following ANSI233.1/NFPA 54, or by local code.
The minimum and maximum inlet gas
pressures are listed below
Natural Gas Min. 5” WC
Max. 10.5” WC
Propane Gas Min. 11” WC
Max. 14” WC
When meas uring the i nlet suppl y pressur e, the
water heater and all other gas appliances
sharing the water heater gas supply line must
be firing at maximum capacity. Maximum gas
pressures must not exceed this value. Low gas
pressure could be caused by an undersized
gas pipe, this will cause the MOBIUS water
heater’s performance to diminish and unable to
reach maximum performance.
When connections are completed, check for
gas leaks by applying soapy water to all gas
fittings and connections. Soap bubbles are a
sign of gas leaks.
This appliance and its individual shut-off valve
must be isolated from the gas supply piping
system by unplugging the unit and turning off
the main gas valve during any pressure testing
of the gas supply piping system at test
pressures equal to or less than ½ Psi. The
appliance and its gas connections must be
leak test ed befor e placi ng th e unit in op erat ion.
Always use approved connectors to connect
the unit to the gas line. Always purge the gas
line of any debris before connecting to the
heater gas inlet.
WARNING: Conversion of this unit from
natural gas to propane or propane to natural
gas cannot be done in the field. Contact your
local retailer or distributor to get the correct unit
for your gas type. Conversion done by anyone
other the manufacture will void any and all
warranty.
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