MOBIUS Water Heater Takagi Industrial Co. USA, Inc.
Installation and Operation Instruction
MODEL T - M1
MOBIUS Water Heater
Gas Fired, Instantaneous, Tankless
Water Heater
Store these instructions near to the water heater for reference purposes.
TAKAGI INDUSTRIAL CO. USA Inc.
6 Goddard, Irvine, CA 92618
Tel. (949) 453 - 8388, FAX. (949) 453-8498
E-Mail: Takagi@takagi-usa.com
http://www.takagi-usa.com
FEATURES
θ ENDLESS HOT WATER SUPPLY
θ ON-DEMAND HEATING
θ PILOT-LESS SYSTEM
θ COMPACT, SPACE SAVING
θ COMPUTERIZED CONTROL S
θ COMPUTERIZED SAFETY DEVICES
θ MULTI-UNIT INSTALLATION READY
FOR YOUR SAFETY - READ BEFORE OPERATING
FOR YOUR SAFETY - This product must be installed and serviced by a professional
Plumbing or Gas licensed service-trained technician. Installation and/or operation could
create carbon monoxide gas and other dangerous gases, which can cause serious injury
or death. Improper installation and/or operation will void the warranty.
WARNING:
If the information in this 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 flammable 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.
•
Do not touch any electrical 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.
• A trained technician, qualified installer, or service agency, must perform installation
and service.
WARNING: To install this unit correctly, you must follow the procedures in this manual.
If you do not do this, the war ranty offer ed by Takagi I ndustrial Co . USA, Inc. wi ll be
voided.
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, talk with a factory representative before beginning any
changes.
CONTENTS
Introduction …………. 4
For Your Safety …………. 4
Operation …………. 6
• General …………. 6
• Temperature …………. 7
• Freeze Prevent Device …………. 7
• Winterizing …………. 7
Installation …………. 8
• General Instruction …………. 8
• Outdoor Installation …………. 9
• Indoor Installation …………. 11
• Combust ible Ai r S up ply …………. . 1 1
• Venting Instructions …………..12
• Vent Connections …………..12
• Vent Termination …………..13
• Gas Supply and pipe …………. 14
• Water Connections …………. 15
• T & P Relief Valve …………. 16
• Electrical Connection …………. 17
• Wiring …………. 18
•
Starting The System …………. 19
Operating Instructions …………..19
Maintenance and Service …………. 24
Cleani ng the Hea t Excha nger ……… 25
Trouble Shooting …………. 25
Trouble Shooting Flow Chart……….. 26
Part Diagram …………. 30
Part List …………. 34
MOBIUS Water Heater Application….36
Temperature Chart …………. 38
SPECIFICATIONS
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”x18”x 9”
Ignition Electronic Ignition
Electrical Supply AC 120 V
***
• Inlet gas pressure must be within above value.
• High altitude, before install in areas over 4,500 feet above sea level. Contact the
manufacturer for a high altitude.
• Check the rating p l a t e t o insure this produc t matches yo u r specifications.
• Takagi - USA is co nstantl y im provi ng our pro ducts, ther efore speci fic atio ns are s ubjec t to
change without prior notice.
INTRODUCTION
This manual provides information necessary for the install ation, operation, and maintenance
of the MOBIUS Model T-M1 water heater.
The model designation is listed on the rating plate, which is attached to the front of the water
heater. Please read all application and installation procedures completely before doing the
installation. If you have any problems or questions regarding this equipment, consult the
Takagi Industrial Co. USA, Inc. or local factory representative. Experience has shown that
most operating problems are caused by improper installation.
FOR YOUR SAFETY
PLEASE READ THIS MANUAL CAREFULLY AND FOLLOW IT FOR YOUR SAFETY.
1. Follow al l local c odes, or in t he absence of local cod es, foll ow the most re cent edit ion of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
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.
3. Carefully plan w here t o i n stall the MOBIU S W ater H ea t er. Ensure th at the h e a t e r will ha ve
enough combustible air, proper ventilation, and will be located where water leakage will
not cause damage. If there is a possibility of water damage install a suitable drain pan
under the unit, but make sure that it does 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.
RATING PLATE
5. If any problem should occur, turn of f all hot water taps and turn off the gas. Call a trained
technician, the Gas Company, or the manufacturer.
6. WARNING: Do not disconnect the electrical supply if the ambient temperatures will be
near freezing. The Freeze Prevention Device will only work if the unit has proper electric al
power. The Freeze Prevention Device is rated for temp eratures down to 5ºF (-15ºC) in a
wind free environment. Wind chill factor can cause the MOBIUS Water Heater to freeze
and be damaged at temperatures above 5ºF (-15ºC). Refer to the section on Winterizing
and the Freeze Prevention Device for more i nformation. Weather related damage to the
heat exchanger will not be covered under the warranty.
7. WARNING: Before bathing or showering always check the water temperature. Do not
leave children or the infirm without supervision in a shower or bath. The water
temperature is factory set at 140ºF (60ºC) to maximize the amount of hot water avail able
without an optional temperature remote controller. Water temperatures over 125ºF can
cause severe burns instantly, or death from scalds.
8. WARNING: Do not use th i s ap plianc e i f an y pa r t ha s be en u nd er wa t er. I m m edi at ely call a
certified and trained technician to inspect and service the unit if necessary.
9. WARNING: Do not store or use gasoline or other flammable vapors and liquids in the
vicini ty of this or any other a p pliance.
10. WARNING: Do not reverse the water and gas connections, this will damage your heater
and can cause severe injury or death from scalds. Follow the diagram below when
installing the MOBIUS water heater.
Pressure relief Valve HOT COLD GAS
OPERATION
GENERAL
The MOBIUS Water Heater is an instantaneous, tankless water heater desi gned to supply an
entire household or commercial hot water utilizi ng total effi ciency. The principle behind the
MOBIUS Water Heater is simple. Once a hot water t ap is opened, water flows through the
MOBIUS Water heater. The water flow sensor automatically commands the computer to
electronically ignite the burners and the computer monitors the water temperature, water flo w
rate, and gas flow the insure you get the right amount of hot water with right temperature.
While gas is being burned, the “fire on” lamp will be lit. Computer will modulate gas supply to
gas valve and modulate water flow for steady out put hot water temperature.
0.75 gallons per minute is required to turn the burners on, but after the burners are i gnited,
the fl ow r a te ca n dro p t o 0. 6 gal l on s per m in ute to m ai nt ai n a nd k ee p t he wa t er he at er o n. A s
long as water, gas and electricity are supplied, t here will be an endless fl ow of hot water. The
water heater will turn on when a tap is opened, and it will turn off when the tap is closed.
Temperature
The water temperature has been set on the computer by the factory to be Maximum 140º F
(60º C ). In ord er to ac hieve l ower wa ter tem peratu res, col d wate r needs to be mi xed in with
the hot, or an optional part No. TM-RE10 can be installed allowing manual adjustment of the
output temperature for lower or higher.
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 a fl ow rate of hot water that is depend on the inlet water
temperature and the setting on the TM-RE10. Refer to the flow vs. temperatur e chart for the
output capabilities end of this installation manual.
Freeze Prevention Devices
This unit comes equipped with heaters that discourage the unit from freezing, but 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. The unit has been rated for temperatures down to 5º F (-15º C ) in a wind f ree
environment. A 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 extremel y cold weather. This will void your
warranty and Takagi - USA will not be responsible for any damage that occurs.
CAUTION: The pipe heaters ar e located on the MOBIUS Water Heater only. Any hot or
cold water pipes located outside of the un it will not be protected . Properly protect and
insulate these pipes from freezing.
Winterizing
If th e h eater will no t be use d for a l ong per iod of t i me or if the t e mperatures will d r o p b elow 5º
F (-15º C) with the wind chill factor, turn off the heater and drain the unit of water. This will
keep it from freezing and being damaged. Follow these instructions carefully:
1. Turn off the power supply to the MOBIUS Water Heater.
2. Close the m anual gas co ntrol valve locat ed outside your he a t e r .
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
water flow has ceased, close all hot water taps.
5. Have a bucket or pan available to catch the water as it drains from the T-M1 drain plugs.
Remove the drain plugs to drain all the water out of the unit.
6. Let sit for 5 minutes.
7. Securely screw the drain plugs back into place.
To restart heater, 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. Turn on the manual water control valve located on the water supply line.
4. Open all the hot water taps to verify water flows to the taps. Then close hot water taps.
5. Turn on the manual gas control valve located on the gas supply line.
6. Turn on the power supply to the MOBIUS Water Heater.
DRAIN DRAIN AND FILTER
INSTALL ATION
General
All gas water heaters require careful and correct installation to insure safe and efficient
operation. This manual must be followed exactly.
1. Read the For Your Safety section in the beginning of this manual.
2. The regulator is preset at the factory. It is computer controlled and should not need
adjustment.
3. Maintain proper space for servicing. Install the unit so that it can be connected or removed
easily.
4. The electrical connection requires a means for switching off the power supply.
5. Avoid instal ling the unit in an area with high levels of dust, sand or debris. These particl es
may clo g the air vent or impair the functi on of the fan , leading to i mproper comb ustion.
Regular maintenance is needed in these environments.
6. Do not install the unit where the exhaust vent is pointing into any opening in a building or
where the noise may disturb neighbors.
Accessories
Check that all parts listed below were included with the unit.
Installation Manual, Warrant y Card and Optional Part Infor mati o n
This sec tion is for t he install er. The inst aller is resp onsible fo r the correct i nstallat ion of
the MOBIUS Water Heater.
For Your Safety: Only a certified an d t r ained ser vice technici a n or qualified pl umber may
service or install your product.
OUTDOOR INSTALLATION
Follow all local codes. In the absence of local codes, follow the National Fuel Gas Code
ANSI Z221.23.
Install the water heater in an open, uncovered area, and maintain the following minimum
clearances. The MOBIUS water heater must be installed hanging from a wall.
Piping side (Bottom) 12”
Front (Maintenance space) Open
Back of heater 1”
Top of heater 36”
Do not install this water heater under an overhang without a 3 feet clearance between the
MOBIUS water heater and eaves or any obstacles. The area under an overhang must be
open to three sides. In case install two or more unit manifold, side clearance will be 0.5”.
WARNING: Do not have the flue 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 f lammable vapors may get into
the flue terminal. This may cause damage to the heater and manufacture warranty will void.
WARNING: In the USA, do not instal l the water heater v ent terminator wi thin 4 feet of any ai r
intake opening into a building. In Canada do not install the water heater vent terminator within
10 feet any air intake opening into a building.
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
produc t war r a nt y.
For high altitude installation above 4,500 feet, contact the ma nufact urer on how to ha ndle t his
situation.
WARNIN G: U se pr op er ve nt t erm ina to r to t op o f t he wa ter heat er , whe n i t in stal l i n out si de o r
Part No. TM-TV02 kit for outside installation as vent cap.
INDOOR INSTALLATION
FOR INDOOR INSTALLATION: ∗CUT PRESSURE SWITCH JUMP WIRE
THEN INSTALL
4” VENT PIPE DIRECTLY ON FLUE OUTLET. ∗ : PLEASE! Look inside unit.
Combustion Air Supply
The water heater should be located in an area where enough air is available for proper
combustion and ventilation of the surrounding area. Follow the latest edition of ANSI
Standard Z223.1 and any your local codes that are applicable.
In general these requirements specify that if the unit is installed in a confined space, there
must be permanent air supply openings.
Minimum recommended Air supply to water heater
Water heater size Outside air area Inside air area
Max. 235.000 BTU 59 Sq. IN 235 Sq. IN
Air Supply from Outside Building: When combustion air is supplied directly through an
outside wall, such as intake louvers openings into the dwelling. Each opening should give a
minimum free area of one square inch per 4000 BTUH of the total input ratings of all
appliances in the enclosed area.
Air Supply from Inside Building: W hen c ombus tio n air is sup pli ed f rom in sid e the bu il ding ,
Each opening should give a minimum free area of one square inch per 1000 BTUH of the
total input ratings of all appliances in the enclosed area. These openings should never be
less th an 100 Sq. IN.
235 Sq. In.
Exhaust Fans and Ventilation: The MOBIUS water heater is equipped with a c ombustible
air detector to measure whether there is enough air for proper combustion. If t here is not, the
water heater will not work until air is provided properly.
Any equipment, which uses air from an enclosed space, can deplete the air f rom that area.
This can result i n exhaust f lowing f rom the fl ue to the enc losed s pace, whi ch could re sult in
the accumulation of dangerous exhaust fumes in the space where the water heater is
installed. Additional air must be supplied to compensate for any exhaust effect.
If a blower of fan is used to supply air to the water heater room, the installer should make
sure it does not create drafts, which could cause unwanted shutdowns. If a blower is
necessary to provide adequate combustion air to the water heater, a switch or equivalent
device must be wired into the water heater control circuit to prevent the water heater from
firing unless the blower is operating.
Venting Instruc tions
GENERAL
This water heater must be vented in accordance with "Venting of Equipment" section of the
latest edition of the National Fuel Gas Code, ANSI Z223.1 and all applicable local building
codes.
WARNING: Improper venting of this appliance can result in excessive levels of Carbon
Monoxide, which can result in severe personal injury or death.
Here are some general rules for venting system for 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
rest on t he water heater. The flue must be easily removable for normal service and
inspection of the unit.
4. The water heater must not be common vented with 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. Av oid using a n ov ersi zed ve nt pi pe or u sin g ext reme ly lo ng ru ns of the p ipe. This may
cause excessive cooling and condensation of flue gases.
A) Vent Connections
The MOBIUS water heater should be vented as Cat egory I with Single-wall metal pipe. The
vent sys tem must be gas tight. Al l seams and joi nt must be se aled with si licone sealant or
adhesive tape having a minimum temperature rating of 400º F. For best results, a horizontal
vent system should be as short and straight as possible with Category III stainless pipe.
When i nstalling the vent s ystem, all applicab le nationa l and local codes must be follo wed. If
thimb les, fire stops or o ther prot ective d evices ar e going t o be inst alled whi ch wil l penetrat e
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