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
any combustible or noncombustible construction, be sure to follow all applicable national and
local codes.
Fan assisted appliances: 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.
Venting
Diameter 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.
When the horizontal vent run exceeds 5 ft the following criteria must be observed;
• 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.
Indoor Installation Clearances
Bottom (Plumbing side) Min. 12”
Front (Maintenance space) Suggested 24”
Min. 4”
Back of heater 1”
Sides Min. 2”
Top of heater Min. 12"
When MOBIUS installs with manifold system, side clearance will be 0.5”.
B) Vent Termination
A sidewal l vent ter minal must be used when the water he ater is vente d through a wall. The
manufacture recommends Takagi Parts No. TK-TV01 as a v ent terminator. Th e vent terminal
provides a means of installing vent pipe penetrating through a wall. Locate this in
accordance with ANSI Z223.1/NFPA 54.
Install the vent terminal in a location that will not be blocked by snow or water flooded area.
Most areas have codes requiring the terminal to be 12 inches above the grade, but the
instal ler m ay det ermin e it s hould b e hi gher dep endi ng on l ocal condi tions and ap plic able city
codes.
GAS SUPPLY AND PIPING SIZING
This unit needs a manual gas control valve (system shutoff valve) that must be placed o n the
unit before it is connected to the gas supply line.
Check the gas inlet pressure and that the type of gas matches the rating plate located on
your water heater. Insufficient gas pressure will cause your MOBIUS Water Heater to be
inefficient and not work properly. Size the gas supply piping 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
Propan e Gas Min. 11” W C
Max. 14” WC
12"
12"
4"
12"
12"
2"
2"
In order to get a correct reading of the i nlet supply pressure, the water heater and all other
gas appliances sharing the gas supply line must be firing at maximum capacity when the
pressure is measured. Maximum gas pressures must not exceed this value. If the gas
pressure is insufficient, this may be the result of an undersized gas supply pipe. The
MOBIUS water heater will not perform to its maximum capabilities without enough gas supply.
After connecting the unit, 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 appli ance
and its gas connections must be leak tested before placing the unit in operation.
Always use approved connectors to connect the unit to the gas line. Always purge the gas
line of any debris before connection to the heater.
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 corr ect unit for
your gas type.
Recommend Gas pipe size for MOBIUS Water Heater
Distance from Gas Meter Pipe Size (inches)
0' - 20' 3/4"
20' - 80' 1"
80' - 300 1-1/4"
NOTE: Th ese Ta bles are f or Na tural Gas ( 0.6 0 Spec if ic Grav it y) and base o n Pre ssur e Drop
of 0.5 Inch water columns. This tables are Gas pipe will supply gas straight to water heater
without any tab.
Water Connections
An approved manual water control valve must be placed on the cold water supply line. All
soldering materials and piping materials must be useable with potable water.
If the water heater is installed in a closed water system, means shall be provided to control
thermal expansion. Contact the water supplier or local plumbing inspector on how to control
this situation. After installing the water heater, purg e the water line to remove all debris and
air from it. It may damage the heater if installer does not do this act.
There is a wire mesh filter on the coldwater inlet which discoura ges debris from entering the
heater. This will need to be cleaned periodically to ensure that the T-M1 has a long life cycle.
T&P Valve HOT COLD GAS
WARNING: Do not reverse the hot outlet and cold supply line connecti ons to the MOBIUS
Water Heater. This will result i n dangerous operation and void the warranty. Make sure t he
hot and cold lines are connected properly. Refer to the FOR YOUR SAFE TY section at the
front of this manual.
PRESSURE RELIEF VALVE
This unit does not come with an approved temperature and pressure rel ief valve, however an
approved temperature and pressure relief valve must be installed on the hot water outlet. A
“Tee” fitting should be used to attach the temperature and pressure relief valve.
The pressure relief valve must meet not exceed the following:
Pressure Relief 150 psi
The discharge capacity must be at least 235,000 Btu/hr. The discharge piping for the
temperature and pressure relief valve must be directed so that if it becomes necessary, no
one will be hurt and nothing will be damaged by the escaping water. Attach the run-off tube to
the temperature and pressure relief valve, and run the end of the tube to within 6" of the floor.
Do not install any reducing couplings, valves, or any other type of restriction in this line. This
run-off tube must be installed to allow free and complete drainage of both the valve and the
run-off tube.
If the temperature and pressure relief valve on the appliance discharges periodically, this may
be due either to thermal expansion in a closed water supply system, or a defective
temperature and pressure relief valve. If the T&P valve is the problem, replace it with a new
one. If not, contact the water supplier or a local plumbing inspector for how to correct this
situation.
The temperature and pressure relief valve must be manually operated once a year to check
for correct operation.
Should overheating occur, or should the gas supply fail to shut off , turn off the manual gas
control valve to the appliance.
Pressure relief Valve
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.
Electrical Connections
WARNING:
The heater must be electrically grounded. Follow the 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.
Do not rely on the gas or water piping to ground the metal parts of the water heater, because
plastic pipe or dielectric unions may isolate the water heater electrically. Service and
maintenance personnel who work on or around the water heater may be standing on wet
floors, and could be electrocuted by an un-grounded water heater.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring error can
cause improper and dangerous operation. Verify proper operation after servicing.
The MOBIUS water heater requires an electrical power supply of 120 VAC, 60 Hz, and it
must be properly grounded to function.
• A means for switching off the 120 VAC power supply must be provided.
•
Wire the heater exactly as shown in the wiring diagram.
•
A green screw is provided in the junction box for the grounding connection.
Refer to the wiring diagram. There is a copy of the wiring diagram located on the inside
panel of t he appli ance.
Wiring Diagram
Also wiring diagram is located on the inside 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. Wires are available through the manufacturer.
STARTING THE SYSTEM
For your safety, read before operating.
a) This water heater does not have a pilot. It is equipped with an ignition device, which
automatically lights the burner. Do not try to light the burner by hand.
b) Before operating, make sure that a gas leak is not evident by smelling the area around the
T-M1. Be sure to smell next to the floor because some gas is heavier than air and will
settle on the floor.
c) Use only a hand to turn the gas valve knob. Never use tools. If the knob will not turn by
hand, do not try to repair it, call qualified service technician. Force or attempted repair
may result in a fire or explosion due to the gas leakage.
d) Do not use this water heater if any part has been under water. Immediately call a qualified
service technician to inspect the water heater and to replace any parts that have been
under water.
WHAT TO DO IF YOU SMELL GAS
• Do not try to start the water heater.
• Do not touch any electrical switches, and do not use any phone in your building.
• Immediately call the gas supplier from somewhere else. Follow the gas supplier’s
instructions.
• If you cannot reach the gas supplier, call the fire department.
Operating Instructions
The MOBIUS Water Heater is an instantaneous, tankless water heater designed to supply
your entire household and 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. The water flow sensor automatically commands the
computer to electronically ignite the burners and the computer monitors the water
temperature, water flow rate, and gas flow the insure you get the right amount of hot water
with right temperature hot water. After the burners are ignited the “fire on” lamp is lit.
Computer will modulate gas supply to valve and water flow. 0.75 gallons per minute is
required to turn the burners on, after the b urners are ignited, the flow rate can be lowered to
0.6 gallons per minute to maintain and still keep the heater on.
Now as long as you have water, gas and electricity, you will get an endless hot water. Open a
hot water tap to turn on your water heater. Close the hot water tap to turn off your water
heater.
Normal Operation
To Turn on Your MOBIUS water heater
1. Open a hot water tap.
2. Burners will ignite. “Fire On” lamp will be lit.
3. Mix with cold water to get the correct temperature.
To Turn off your Flash water heater
1. Cl ose the hot water tap
2. “Fire On” lamp extinguished.
Start Up
Once the unit has been properly installed, check the gas and water connections for leaks.
Check for proper ventilation and combustible air to the heater.
Purge the gas and water
lines to remove debris.
Then follow these steps to turn on your unit.
1. Close the manual gas control valve located on the gas line.
2. Fully open the manual water control valve on the water supply line.
3. Open a hot water tap, to verify that water will flow to that tap. Then close the hot water tap.
4. Fully open the manual gas control valve.
5. Turn on the 120 volt 60 Hz power supply to the MOBIUS Water Heater.
6. No w you are ready to enjoy hours of endless hot water.
TO TURN OFF GAS APPLIANCE
Close the manual gate valve on the gas inlet line. Then turn off the power supply.
Manifold Gas Pressure Port
FOR YOUR SAFETY READ BEFORE OPERATING
A. Thi s water heater 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 water heater 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 t urn the gas valve knob. Never use tools. If the knob wil l 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 wat er heate r if any par t has been un der water . Immedi ately call a
qualified service technician to inspect the water heater and to replace any damaged
parts.
WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of
life.
OPERATING INSTRUCTIONS
1.
STOP! Read the safety information above or in the Owners Manual.
2. Turn off all electric power to the water heater.
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 water heater.
8. I f the water heater wil l not oper ate, f ollow the i nstructions " to Tur n Off Gas to water
heater" and Call your service technician or gas supplier.
TO TURN OFF GAS TO APP LI AN CE
1. Turn off all electric power to the water heater if service is to be performed.
2. Tur n the m anual gas v alve locate d on t he ou tsid e of th e unit c loc kwise
↻ to the off
position.
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 water heater.
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.
WA RN I N G
The outlet hot water temperature of the MOBIUS water heater is factory set 140 °F.
WARNING: Use this heater 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 su
p
ervised.
DANGER
Keep flammable pr od ucts:
1. Far away from heater.
2. In approv e d containers.
3. Tightly closed
4. Out of children's reach
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.
DANGER
Hot Water Heater 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 professional
person.
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.
Maintenance and Service
WARNING: Always turn off the electrical power supply, the manual gas control valve,
and the manual water valve when servicing.
The unit should be checked once a year by a certified and trained technician. If repairs are
needed, a certified and trained technician should do the repairs and services.
Regular Maintenance
Do this the first time immediately after installation.
1. Cl ean the cold water inlet filter (refer to figure below).
2. Be sure that all openings for combustion and ventilation air are not blocked.
3. Check that t he vent pi pe is not blocked.
4. Check the gas pressure.
5. Keep the area around the water heater clear. Remove any combustible materials,
gasoline or any flammable vapors and liquids.
These systems and parts should be checked at least once a year.
1. Venting system.
2. Burner.
3. Manually test the temperature and pressure relief valve to insure correct operation.
4. Periodically clean of the water filter (refer to figure above).
5. Heat exchanger. Remove the thermistor and check for a mineral coating. A mineral
coating on the t hermi stor re quires flushi ng th e heat exc hange r wit h a de-sca ling so luti on.
Allowing deposit build up will void your warranty and shorten the life of your water heater.
Turn Counter Clockwise to OPEN
Cleaning the Heat Exchanger
If the heat exchanger must be cleaned, follow this procedure.
1. Shut off all power to the water heater.
2. Use re-circulation method.
3. Wear Gloves when handling de-scaling solution.
4. Al ways ware EYE PROTECTION.
5. All equipment being de-scaled should be properly vented to prevent gas pressure
build-up during the cleaning operation.
6. Clean out any debris, which has fallen to the coldwater inlet filter.
MOBIUS Water Heater Troubleshooting:
The MOBIUS Water Heater Model T-M1 has a built in self-diagnostic computer mode for
safety and convenience in case of necessary maintenance service.
On the T-M1 computer board, a numeric error code will
appear when the MOBIUS water heater has a problem. This
error code will identify the symptoms of the problem and
indicate what service is necessary.
The T-M1 consists of five main systems. These are the
temperature control, the gas control, the water control, the
burner control, and the main computer control systems.
Trouble Shooting Flow chart:
The MOBIUS water heater is one of the most trouble free water heaters there are.
However, if there is trouble, use the error cod e on the computer to follow this trouble shooting
flow chart.
Error N0. Component
031,141,711,741,
751
Main Computer Control
701
Temper ature Control (Setting Temp .
+ over 50
°F)
111, 121 Burner Flame
311, 321,331 Temperature control
391,611,721,991 Burner control
501 Gas control
651, 661,541 Water control
101 Combustible Air
211 Vent pipe
①
541
711
141
321
311
331
701
031
721
651
541
661
611
111
121
510
711
321
311
331
661
651
701
991
141
Circuit board for valve D. E.F Failure
Valve B failure
Valve C failure
Circuit board
A
bnormal High Temp.
High-limit switch
YES
YES
YES
YES
YES
YES
YES
Valve A
Open limit on
Valve C
Open limit on
Valve A
Open limit on
Pre-check
Normal
Flow Sensor
>
0.75 GPM
Valve C
Close limit off
Set Temperature
<
140F
Power On
Operation Switch ON
Faucet opened
NO
(
A
fter 18 sec.)
NO
(
A
fter 18 sec.)
NO
(
A
fter 18 sec.)
NO
(
A
fter 18 sec.)
NO
NO
NO
(
A
fter 18 sec.)
NO
Valve B
Open limit on
C
⑥
⑤
*1
*2
*3
Abnormal Burning
*5 *6
YES
②
②
①
⑰
④
⑧
③
④
⑱
(
A
fter 35 sec.
)
Valve A opens
Valve B opens
Valve C opens
Dis
play
:
Dis
play
: Priorit
y
Control Valve B Open Valve B
Open Valve A
611
*13
*4
Valve A failure
High-limit switch off
Open Short:
Inlet Temp. Thermistor
Open Short:
Output Temp. Th ermistor
Open Short:
Mixing Temp. Thermistor
Circuit board failure
Mismatched gas
Flame failure
Valve C failure
A
bnormal fan rotation
Ignite failure
Lost flame
Valve C failure
Valve B failure
Valve H failure
Gas valve circuit
board failure
Open Short:
Inlet Temp. Thermistor
Open Short:
Output Temp. Termistor
Open Short:
Mixing Temp. Termistor
Fan off
Faucet closed
Flow sensor off
Operation switch off
Power off
A
ll display off
Maintenance
Start
Fan off
Valve H off
Valve D off
Valve G off
Valve E off
Valve F off
B
MOBIUS
Water Heater
Model T-M1
Trouble Shooting
Diagnosis
Flow - Chart
*4
YES
YES
⑩
⑨
*1
YES
YES
⑫
⑪
YES
YES
⑮
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
*2
(
A
fter 18 sec.)
*3
YES
NO
*5
(
A
fter 20 sec.)
(
A
fter 20 sec.)
(
A
fter 5 sec.)
(
A
fter 5 sec.)
*6
A
(
A
fter 3 sec.)
(
A
fter 10 sec.)
101
NOYES
Valve A
Open limit on
Fan motor rotation
(<1000rpm)
Fan motor on
Fan motor rotation
(>1000rpm)
No flame
(>0.15μA)
Igniter On
Valve H On
Valve D On
Valve G On
Thermo fuse
Normal
Check flame
(>1.0μA)
Display: Running
Igniter Off
Proportional control
Check output temp.
<
203F
Check for
Normal power?
Valve B
improperly open
< 2 minutes
Fan Off
Re-ignite
(<
2 times)
Valve H Off
Valve D Off
Valve G Off
Igniter Off
Valve H Off
Valve D Off
Valve G Off
Valve E Off
Valve F Off
Display: Running Off
⑦
⑬
⑭
⑦
D
E
YES
YES
5 sec. later
Valve A
Close limit on
Faucet closed
NO
NO
(
A
fter 35 sec.
)
NO
(
A
fter 18 sec.
)
Valve H Off
Valve E Off
Valve F Off
Flame detection off
Dis
play
: running off
Stop
Flow sensor off
No flame
(>0.15μA)
Valve D Off
Valve G Off
Fan motor off
Valve B open
Valve A close
B
510 Blinks
⑬
A
(
A
fter 10 min.
)
C
⑨
YES
YES 661
NO YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Output temp down
(
A
fter 60 sec.
)
F
F
D
Check power
<
Min. BTU
Valve E Off
Valve F Off
Capacity check
<
Max. BTU
Flow sensor
<
8.45GPM
Valve C Open
Start
Safety function
Capacity Check
>
Max. BTU
Flow sensor
>
8.45GPM
Valve C control
Valve C Close
Capacity Check
<
Max. BTU
Flow sensor
<
8.45GPM
Valve C control
Check power
<
Mid. BTU
Valve E On
Valve F Off
Valve E On
Valve F On
Thermocouple
>
1mV
Thermocouple
<
10mV
Thermocouple
>
1mV
Thermocouple
<
10mV
Fan speed up
>
15%
Display: 101
Max burning power: 12
Thermocouple
<
12mV
Fan speed up 3%
*13
A
bnormal fan rotation
(<
1000rpm)
When differentia l >±
200rpm with setting
A
bnormal burning
E
<Water Valves >
Valve A Water Outlet Valve (Two way valve)
Valve B Bypass Flow Adjustment Valve
Valve C Flow Adjust ment Val ve
<Gas Valve>
Valve D Solenoid Valve 1
Valve E Solenoid Valve 2
Valve F Solenoid Valve 3
Valve G Proportional Valve
Valve H Gas Inlet Valve (Main Valve)
Error Symptom Error Symptom Error Symptom
31 Wrong Gas Type 331 Mixing Thermistor Fail 701 Mixing Thermistor Abnormality
101 Insufficient Gas Supply 391 Thermocouple Abnormality 711 Gas Solenoid Valve Abnormality
111 Ignition Failure 510 Main Gas Valve Abnormality 721 Computer Pre-post Check Problem
121 Flame Loss 541 Two-Way Valve Abnormality 741 Main Remote Control Problem
141 Hi-Limit Switch 611 Fan Motor Abnormality 751 Temperature Remote Control Problem
311 Output Thermistor Fail 661 Bypass Valve Abnormality 761
Multi-system
Controller Problem
321 Inlet Thermistor Fail 651 Flow Adjust. Valve Abnormality 991 Abnormal Burning
211 Vent pipe
Hi-limit switch w orks
(>
208F)
Circuit board for Valve D
failure
A
bnormal high water
temperature
⑥
Open Short:
Output Temp. Th ermister
Open Short:
Mixing Temp. Thermister
Open Short:
Inlet Temp. Thermister
Thermo fuse cut off
(>
360F)
Flame detector
Display: running off
MOBIUS Water Heater
Parts List and Component Diagram
MOBIUS Water Heater
Part List
Part No. Description Part No. Description
1 Case Assembly 65 O-ring P25
2 Brackets 66 Filter
3 Screw (W) M4 x 10 67 Packing
4 Back Guard Panel 68 Combustion Chamber
5 Transformer A 69 Burner Assembly
6 Transformer B 70 Screw M4 x 12
7 Junction Box 71 Wire Holder
8 Junction Box Cover 72 Spark Electrode Holder Packing
9 Screw M4 x 8 73 Spark Electrode Holder
10 Sound Insulation 74 Screw M4 x 10
11 Screw M4 x 8 (Coated) 75 Silicon Cap
12 Weather Protection Panel 76 Spark Electrode Fixing Plate
13 Front Cover 77 High Voltage Igniter Cable
14 Exhaust Pipe 78 O-ring (seal)
15 Heat Exchanger Assembly 79 Thermocouple
16 Hi-Limit Switch 80 Thermocouple Fixing Plate
17 Screw M3 x 6 81 Overheat Cut Off Fuse
18 Screw M4 x 10 (coated) 82 Damper
19 Output Thermistor 83 Washer
20 O-ring P4 84 Pressure Switch Port
21 Heater Block 604 85 Silicon Tube
22 Heat Exchanger Fixing Plate (Back) 86 Pressure Switch
23 Heat Exchanger Fixing Plate (Front) 87 Fan Motor
24 Over Heat Cut Off Fuse Fixing Plate 88 Screw M4 x 12 Hex
25 Over Heat Cut Off Fuse 89 Thermostat
26 Heater Block Fixing Plate 90 Screw (W) M3 x 10
27 Inlet Thermistor 91 Manifold
28 Two Way Valve Cover 92 Manifold Gas Pressure Port
29 Silicon O-ring M26 93 Gasket
30 Two Way Valve Assembly 94 Screw M4 x 12
31 O-ring P20 95 Manifold Gas Pressure Tap
32 Screw M4 x 8 96 Gas Coupling
33 Quick Release Plate 97 Screw M4 x 8 (Washer & Hex head)
34 O-ring JASO#1017 98 Igniter Fixing Plate
35 Screw M4 x 12 99 Igniter
36 Flange 100 Screw M4 x 6
37 Flow Adjustment Valve 101 Solenoid Valve Wire
38 O-ring P16 102 Proportional Valve Wire
39 Bypass Junction 103 Gas Valve Unit
40 Screw M4 x 6 104 O-ring P22
41 O-ring P18 105 O-ring P18
42 Water Outlet Connection 106 Screw M4 x 8
43 Screw M4 x 14 107 O-ring P26
44 Mixing Thermistor 108 Gas Inlet
45 O-ring P6 109 Gas Filter
46 Drain Plug 110 Gas Inlet Fixing Plate
47 Mixing Connection 111 Computer Board
48 Drain Plug Band 112 Computer Board Sticker
49 Water Outlet 113 Mode Port
50 Screw (W) M4 x 12 114 Control Box
51 Bypass Flow Adjustment Valve 115 Screw M3 x 25
52 Bypass Valve Cover 116 Wire Holder
53 Silicon O-ring M22 117 Condenser Terminal Plate
54 Bypass Connection 118 Surge Absorber: A
55 O-ring JASO3#1017 119 Surge Absorber: B
56 Clamp 120 Screw M4 x 16
57 Heater Fixing Plate 121 Condenser Terminal
58 Screw M4 x 6 122 Power Distribution Plate
59 Flow Sensor 123 Ground Fault Circuit Interrupter
60 Heater 102 124 Fuse Box
61 Magnetic Protection Plate 125 Fuse
62 O-ring JASO#1019 126 Fuse Cover
63 Screw M4 x 14 (coated) 127 Remote Control Terminal
64 Water Inlet 128 Screw M3 x 12
MOBIUS Water Heater Application
Hot Water Output Temperature Settin g :
The hot water output temperature on the MOBIUS water heater can be adjusted with an optional remote
controller (Part TM-RE10, 95
°F to 176 °F) or manually with computer control board dipswitches. The
dipswitches can adjust between the following temperatures; 113
°F, 140 °F, 167 °F, and 176 °F. The
failsafe temperature is 140
°F.
Hot Water Recirculation system:
For more detailed Information, information and diagrams can be attained from a trained technician,
qualified installer, service agency, or from the manufacturer’s technical department.
Expansion Tank
Cold Water Supply
Check Valve
Pump Hot Water Return
Aqua stat
Hot Water Supply
Hydro-Heating and Radiant Heating S ystem Application :
For More Detailed Information:
Contact a trained technician, qualified installer, service agency, or the
manufacturer’s technical department.
Manifolded Multi-System Application for Large Volume.
The MOBIUS Water Heater is fully capabl e of being used in a manifol ded multiple-unit s ystem using the
Multi-System Computer Control (Optional Part TM-RE20). This Multi-System Computer Control can
manifold from 2 units to 20 units for commercial and residential application.
A single Multi-System can burn gas in the range of 26,000 BTU to 4.7 Million BTU, and the computer will
completely modulate the system.
For More Detailed Information: Contact a trained technician, qualified installer, service agency, or the
manufacturer’s technical department. Toll Free (888) 882-5244
Output Temperature vs. GPM (Max. 9.6 GPM) for Various Input Water Temperature
0.0
2.0
4.0
6.0
8.0
10.0
12.0
Output Hot Water Temperature
Output Hot Water GPM
40 F 50 F 60 F 70 F
40 F
7.7 7.0 6.4 5.9 5.5 5.1 4.8 4.5 4.3 4.0 3.8 3.5 3.2 3.1 3.0 2.8 2.7
50 F
9.6 8.5 7.7 7.0 6.4 5.9 5.5 5.1 4.8 4.5 4.3 3.8 3.5 3.3 3.2 3.1 3.0
60 F
9.6 8.5 7.7 7.0 6.4 5.9 5.5 5.1 4.8 4.3 3.8 3.7 3.5 3.3 3.2
70 F
9.6 8.5 7.7 7.0 6.4 5.9 5.5 4.8 4.3 4.0 3.8 3.7 3.5
90 95 100 105 110 115 120 125 130 135 140 150 160 165 170 175 180
Loading...