MODEL T - M1
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
ENDLESS HOT WATER SUPPLY
ON-DEMAND
PILOT LESS SYSTEM
COMPACT, SAVE SPACE
COMPUTER CONTROL
COMPUTERIZED SAFTY
CONSERVES ENERGY
FULL CAPABILITY FOR MANIFOLD
Store these instructions next to the hot water heater for reference purposes.
TAKAGI INDUSTRIAL CO. USA Inc.
3-B Goodyear, Irvine, CA 92618
Tel. (949) 770-7171, FAX. (949) 770-3171
http://www.takagi-usa.com
0
SPECIFICATIONS
CONTENTS
For Your Safety
…………. 2
Introduction
…………..3
•
•
•
•
General
Temperature
Freeze Prevent Device
Winterizing
…………. 4
…………. 4
…………. 4
…………. 5
Installation
…………. 6
• General
• Accessories
Outdoor Installation
Indoor Installation
• Combustion Air Supply
• Venting Instructions
• Exhaust Vent
• Vent Termination
Gas Supply/Piping
Water Connection
Pressure Relief Valve
Electrical Connection
…………. 6
…………. 6
………….6-7
………….8-9
…………..8
…………..8
…………..9
…………..9
…………..10
…………. 11
…………. 11
…………. 12
Starting Operation
Operating Instruction
Wiring Diagram
For your Safety
Danger
Application
• Space Heating
• Dual-purpose heating
• Storage Tank
• Re-Circulation
Optional Items
Temperature Setting
Manifold Multi System
…………. 12
…………12-13
…………..14
…………15-16
…………..16
…………17-19
…………..17
…………..18
…………..19
…………..19
…………..20
…………..21
…………21-25
Maintenance and Service
Trouble Shooting
Error codes
…………..26
…………. 26
…….......27- 31
Component Diagram
Part List
Output temperature Chart
…………32-35
…………36-37
…………..38
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
LP Gas Pressure Inlet
Min. 5” WC
Max. 10.5” WC
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
***
•
•
•
•
•
1
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.
FOR YOUR SAFETY
READ BEFORE OPERATING
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result, causing property
damage, personal injury or death.
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 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 copy this installation
manual without consent from
Takagi Industrial Co. USA Inc.
Copy Right 2002, Takagi Industrial
Co. USA Inc.
•
•
•
FOR YOUR SAFETY - This product
must be installed and serviced by a
professional service trained technician,
licensed plumber or gas fitter when
installed in the Commonwealth of
Massachusetts and/or any State.
Warning
Do not try light any appliance.
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. Follow the gas
supplier’s instructions.
If you cannot reach your gas supplier,
call the fire department.
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.
WARNING: To install this unit correctly, you
must follow the procedures listed in this
manual. Failure to do so will void any and all
warranties offered by Takagi Industrial Co.
USA, Inc.
Improper installation and/or operation
could create carbon monoxide gas and
flue gases, which could cause serious
injury or death. Improper installation
and/or operation will void the warranty.
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.
2
INTRODUCTION
This manual provides information necessary
for the installation, operation, and maintenance
of the MOBIUS Model T-M1 water heater. 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
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. Experiences have
shown that most operating problems are
caused by improper installation (human error).
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 Gas Company or
manufacturer.
6. WARNING: Do not disconnect the
electrical
supply
if
the
ambient
temperatures will be reaching freezing. The
Freeze Prevention Device only works if 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 MOBIUS Water Heater 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.
FOR YOUR SAFETY
FOR YOUR SAFETY, 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 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.
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
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.
7. WARNING: Before bathing or showering
always check the water temperature. Do
not leave children or infirm person
unsupervised in the shower or bath. The
water temperature is set at 120ºF (60ºC)
from the factory to maximize the amount 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 or use gasoline or
other flammables, vapors and liquids in the
vicinity of this or any other appliance.
3
temperature you desire. If desiring hot water
temperature want other than factory setting
temperature (120ºF), 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
temperature controller and/or the water heaters
onboard computer, which will void warranty.
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.
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.
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 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 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.
Freeze Prevention Devices
This unit comes equipped with heater blocks 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 temperatures due to power
loss 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.
Temperature
The temperature has been preset at the factory
for. 120ºF (60ºC). The computer will
electronically control this temperature. Mix the
cold water with hot to get the water
4
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 plugs to drain all the water out of the
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, clean the water filter of any calcium
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.
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.
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 supply 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
located on the gas supply line.
5. Turn on the power supply to the MOBIUS
Water Heater.
5
INSTALLATION
Accessories
Check that all parts listed below were included
with the unit.
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.
Installation Manual, Warranty Card and
Optional Part Information
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.
OUTDOORS INSTALLATION
Follow all local codes and in the absence of
local codes, follow the National Fuel Gas Code
ANSI Z221.23 in USA or in Canada 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.
1. The 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
functions of the rotating fan and cause
gas not to burn properly. 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.
Piping side (Bottom)
Front (Maintenance
space)
Back of heater
Top of heater
12”
24”
1”
36”
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
6
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: 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 install the heater where
water, debris, or flammable vapors may get
into the flue terminal. This may cause damage
to the heater void warranty.
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 feet, Contact the manufacturer on how to handle this situation.
7
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 circuit or
proper devices to prevent the water heater from
firing unless the blower is operating.
INDOOR INSTALLATION
Combustion Air Supply
The water heater 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 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
Venting Instructions
GENERAL
Minimum recommended Air supply to water
heater.
WARNING: Improper venting of this appliance
can result in excessive levels of Carbon
Monoxide, which can result in severe personal
injury or death.
Air Supply from Outside Building
Water heater size
Max. 235.000 BTU
Outside air
area
59 Sq. IN
Inside air
area
235 Sq. IN
This water heater must be vented in accordance
with "Section Venting of Equipment", of the latest
edition of the National Fuel Gas Code, ANSI
Z223.1 and all applicable local building codes. In
Canada, follow CAN/CGA installation codes.
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.
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 rest
on the water heater. 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 covered under
warranty.
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 Make 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 reverse the action of the venting system.
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.
8
When the horizontal vent run exceeds 5 ft. the
following criteria must be observed:
• Attached a vertical pipe at least 12” high to
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.
Exhaust 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 minimum temperature rating of 350º
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, Flex-L, 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 installing the vent pipe. Do
not common vent this appliance 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
Max.
Max. Vertical or
eter
No. of
Horizontal run in
Elbow
Length
4”
3 Ea.
35 ft
Indoor installation clearance.
Piping side (Bottom of
Min. 12”
water 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/CGA-B149 and local applicable
codes.
Locate the vent terminal so that it cannot be
blocked by snow. Most codes require that
termination be at least 12 inches above grade,
but the installer may determine if it should be
higher depending on job site condition and
applicable city code.
For each elbow added, deduct 5 ft. from
max. Vent length.
No. of Elbows
Max. Vertical or
Horizontal Length
0
1
2
3
35 ft.
30 ft.
25 ft.
20 ft.
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
9
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 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 connecting to the
heater gas inlet.
Gas Supply and Gas Piping Sizing
This unit needs a manual gas control valve
(System Shutoff Valve) that must be placed 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 will cause your MOBIUS Water Heater
to be inefficient in performance and not work
properly. Size gas piping system correctly
following ANSI233.1/NFPA 54, or by local
code.
When measuring the inlet supply pressure, 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 would
not be able 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
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.
Recommend Gas pipe size for
MOBIUS Water Heater(Example for NG)
Distance from Gas Meter Pipe Size (inches)
0' - 20'
3/4"
20' - 60'
1"
60' – 100’
1-1/4"
NOTE: These Tables below are for Natural Gas
(0.60 Specific Gravity) and based on Pressure
Drop of 0.5 Inch water columns. This table is for
Gas piping supply straight to the water heater
without any tab to other gas appliance.
Natural Gas Supply Piping
Based on 0.60 specific gravity for natural gas at .5” WC pressure drop
DOE standard is 1100 BTU per cubic ft. of natural gas
Pipe Size
Cubic Feet of Natural Gas
Length
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’ 125’ 150’
½”
174
119
96
82
73
66
61
56
53
50
44
40
¾”
363
249
200
171
152
138
127
118
111
104
93
84
1”
684
470
377
323
286
259
239
222
208
197
174 158
1 ¼”
1404 965
775
663
588
532
490
456
428
404
358 324
1 ½”
2103 1445 1161 993
880
798
734
683
641
605
536 486
2”
4050 2784 2235 1913 1696 1536 1413 1315 1234 1165 1033 936
200’
34
72
135
278
416
801
Propane Supply Piping (Based on 11” WC supply pressure)
Pipe Size
Length
½”
¾”
1”
1 ¼”
1 ½”
2”
kBTU of Propane
10’
20’
30’
40’
50’
60’
70’
80’
90’
100’ 125’ 150’ 200’
275
189
152
129
114
103
96
89
83
78
69
63
55
567
393
315
267
237
217
196
185
173
162
146
132
112
1071 732
590
504
448
409
378
346
322
307
275
252
213
2205 1496 1212 1039 913
834
771
724
677
630
567
511
440
3307 2299 1858 1559 1417 1275 1181 1086 1023 976
866
787
675
6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496 1260
10
as shown in picture to prevent premature wear
of relief valve. The pressure relief valve must
meet and followed local code.
The discharge capacity should be more than
235,000 Btu/hr. The discharge piping for the
pressure relief valve must be directed so that
the hot water cannot splash on anyone or
nearby equipment. Attach the run-off tube to
the pressure relief valve, and run the end of
the tube to within 6" from 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 pressure relief valve on the appliance
discharges periodically, this may be due to the
thermal expansion in a closed water supply
system or defective pressure relief valve,
replace a new pressure relief valve. Contact
the water supplier or local plumbing inspector
on how to correct this situation.
The pressure relief valve must be manually
operated once a year to check for correct
operation. Should overheating occur or gas
supply fail to shut off, turn off the manual gas
control valve to the appliance.
Water Connections
An approved manual water control valve (water
shutoff valve) must be placed on the cold water
supply line. All soldering materials and piping
materials must be suitable with potable water.
If the water heater is installed in a closed water
system, such as one having a backflow
preventer in the cold water supply line, must be
provided to control thermal expansion. Contact
the water supplier or local plumbing inspector
on how to control this situation.
After installation of water heater is complete,
purge the water line to remove all the debris
and air from the line. Failure to or not doing so
may cause damage to the heater. There is a
wire mesh filter to trap debris from entering
your heater. This will need to be cleaned
periodically for long life expectance.
WARNING: Be careful not to reverse the hot
outlet and cold supply line connections to the
MOBIUS Water Heater. This will cause your
heater to operate dangerously and void
warranty. Make sure the hot and cold lines are
connected properly. Refer to the FOR YOUR
SAFETY section at the front of this manual.
CAUTION: Only the pipes within the heater are
protected on the MOBIUS Water Heater. Any
hot or cold water pipes located outside of the
unit will not be protected. Properly protect and
insulate these pipes from freezing.
PRESSURE RELIEF VALVE
The Mobius has a built Hi-Limit (hightemperature) shut off switch and no store hot
water therefore only 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. A “Tee” fitting should be used to attach
the pressure relief valve. Then place the
pressure relief valve 6” inches from water flow
11
Electrical Connections
Starting Operation
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 in
the U.S., or the latest edition of CSA C22.1
Canadian Electrical Code, Part 1, in Canada.
Do not rely on the gas or water piping to
ground the metal parts of the water heater.
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 ungrounded water heater.
For your safety please read before start
and/or operating.
a) This water heater does not have a pilot. It
is equipped with an electronic ignition
device, which automatically lights the
burner. Do not try to light the burner by
hand.
b) Before operating, smell all around the
water heater area for gas leaking. Be sure
to smell next to the floor because some gas
is heavier than air and will settle towards
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 try to repair it, call a
qualified service technician. Force or
attempted repair may result in a fire or
explosion due to the gas leaking.
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
has been under water.
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 from 120 VAC 60 Hz
circuit and be properly grounded.
• A means for switching on/off the 120 VAC
power supply must be provided for service
reasons.
• Wire the heater exactly as shown in the
wiring diagram.
• A green screw is provided in the junction
box for grounding connection.
WHAT TO DO IF YOU SMELL THE GAS!
1. Do not try to start the water heater.
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,
call the fire department.
Operating Instructions
The
MOBIUS
Water
Heater
is
an
instantaneous, tankless water heater designed
to supply 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.
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
Refer to the wiring diagram. Wiring
diagrams are also located on the inside
panel of the appliance.
12
flow the insure you get the right amount of hot
water with right temperature hot water.
After the burners have 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 burners 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.
6.0 GPM, at a 77° F rise above the inlet
temperature. Refer to the following chart of
typical household flow rates to determine what
the Mobius can do in a household application.
Remember that for bathing, cold water will be
mixed for a comfortable temperature,
increasing the flow output rate.
Household Flow Rates
Flow Rate
Appliance / Use
(GPM)
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
Normal Operation
To Turn on Your MOBIUS water heater.
1. Open a hot water tap.
2. Burners ignite. “Fire On” lamp is lit.
Start Up
Once you have properly installed the unit,
check the gas and water connections for leaks.
Check for proper ventilation and combustible
air to the heater.
3. Mix cold water with the hot to get the
correct temperature water.
Purge the gas and water lines to remove Air
pocket.
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
installed.
5. Turn on the 120 volt 60 Hz power supply to
the Flash Water Heater.
6. Now you are ready to enjoy hours of
endless hot water.
To "Turn off your Mobius water heater
1. Close the hot water tap
“Fire On” lamp extinguishes.
FLOW
The flow rate through the Mobius is limited to a
maximum of 9.6 GPM. The temperature
setting, along with the supply temperature of
the water will determine the flow rate the unit
puts out. Consult the flow charts on the last
page of this manual to determine the possible
outlet temperature and flow rate combinations.
Based on the United States Department of
Energy method of testing water heater output,
the Mobius is rated for 370 gallons per hour, or
Manifold Gas Pressure Port
13
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. Wires are available through the manufacturer.
14
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 water heater 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 by hand.
B. BEFORE OPERATING smell all around the water heater area for gas leaking. 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 water heater if any part has been under water. Immediately call a
qualified service technician to inspect the water heater and to replace any damaged
parts.
OPERATING INSTRUCTIONS
1.
2.
3.
4.
5.
6.
7.
8.
STOP! Read the safety information above on this label and Owners Manual.
Turn off all electric power to the water heater.
Do not attempt to light the burner by hand.
Turn the manual gas valve located on the outside of the unit clockwise 3 to the off
position.
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.
Turn the manual gas valve located on the outside of the unit counter clockwise 4 to
the ON position.
Turn on all electrical power to the water heater.
If the water heater will not operate, follow the instructions "to Turn Off Gas to water
heater" and Call your service technician or gas supplier.
TO TURN OFF GAS TO APPLIANCE
1. Turn off all electric power to the water heater 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.
15
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 water heater.
Keep flammable products:
1. Far away from heater.
2. In approved containers.
3. Tightly closed
4. Out of children's reach
Vapors:
1. Cannot be seen
2. Vapors are heavier than air
3. Travels a long way on the floor
4. Can be carried from other rooms to
the main burner by air current.
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.
WARNING
The outlet hot water temperature of the MOBIUS water heater is factory set at 120 °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 supervised.
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
16
Applications
Space Heating Application
The Mobius T-M1 can be used for space heating as well as potable heating of hot water applications.
WARNING
•
•
•
•
•
Toxic chemicals such as used for boiler treatments chemical, alcohol, glycerol
and glycol group will not be introduced into the system when used for potable
water and space heating.
The Mobius T-M1 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 used, a means such as a mixing valve shall be installed to
temper the water for those 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-warm air
or Baseboard heating only.
Basic system drawings and Schematics.
Heating application only:
Warning: This illustration is for concept only. There are a wide variety of variations to the application
of controls and equipment presented applications. Designers must add all necessary safety and
auxiliary equipment to conform to code requirements and design practice.
For more details, contact Technical Department at (888) 882-5244
17
Dual-purpose hot water heating (Domestic and Space Heating)
Diagrammatic Layout of Radiant
Heating and Domestic Water Heater
Priority Control Devices: It has a capability to make priority system that can be
used as a controller flow sensor, Aquastat, or electronic controller to controlling
radiant, Hydro or baseboard heating equipments.
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.
Warning: This illustration is for concept only. There are a wide variety of
variations to the application of controls and equipment presented applications.
Designers must add all necessary safety and auxiliary equipment to conform to
code requirements and design practice.
18
T-M1 with Storage Tank
The maximum flow rate through the T-M1 is 9.6 GPM. If it is necessary to achieve higher flow rates
for longer periods of time, then it can be installed in conjunction with a storage tank. A pump will be
necessary to keep the water hot. We suggest a pump of 1/12 hp or greater depending on the system.
Recirculation
This system will also need a pump of 1/12 hp or greater, depending on the application situation.
19
Optional Items
3. TK-TV03 Vent Damper
1. TM-RE10 Temperature Remote Controller
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.
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 from 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.
2. TK-TV01 Vent Terminator
4. TM-TV06 Vent Cap
This terminator can be used
where a T-M1 is going to be
vented out through a wall. This
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 thimble.
Install vent terminator in accordance with
manufacturer’s installation instructions and any
applicable local codes.
The
TM-TV06
Vent Cap is for
outdoor
installation
with
the T-M1 water
heater. The cap is installed on the top of the unit,
instead 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.
20
Hot Water Output Temperature Setting:
With the MOBIUS Water Heater output hot water temperature can be adjusted either with the optional
remote controller (Part TM-RE10, from 95 °F to 176 °F) or manually from the main computer control
boards dipswitch. Dipswitches can set four hot water output temperatures 113 °F, 140 °F, 167 °F, and
176 °F. (Factory set temperature; 120 °F)
Temperature Dip Switch.
21
Manifold Multi-System Application for Large Volume.
MOBIUS Water Heater has full capability of manifolding multi-systems, with Multi-System Computer
Control (Optional Part TM-RE20). This Multi-System Computer Controller, you can manifold from 2
units to 20 units for commercial and residential application with each computer controller.
One computer (Part TM-RE20) system can make from 25,000 BTU to 4.7 Million BTU system, with
fully automatic modulation for large applications.
Electric Wiring: MOBIUS Water Heater Model T-M1 Electrical Load: Maximum 0.8 A, 120V per Unit.
Individual cut off switch, even though units have very low electrical load, recommended for multisystem for the purpose of maintenance.
22
Multi System
Main Multi System Controller (TM-RE20) and Temperature Remote Controller (TM-RE10)
wiring:
RE-20
201 202
201 202 201 202
RE-10
201 202
Detail Wiring: T-M1 Comunications cables are inside Box for TM-RE20.
TM-RE10 Cable can be use above 18 gage wire and up to 250 ft.
Wire No. 201 (Male Adapter) and No 202 (Female
Adapter)
For TM-RE10
Port.
Use 18 Gage
Wire.
No Polarity
It has four Ports.
Each port can
connect up to Five
T-M1.
No Polarity
23
Pump Connection:
MOBIUS Water Heater Main Multi System Controller will be maintaining set water temperature
inside storage tank automatically with T-M1 ON/OFF Mode.
Circulation Pump between T-M1 system and Storage has to be ON (running) 24-Hour, it will maintain
set temperature.
Pull out jump cable for Store for
activates power port.
Needs power relay for using this
application
Final Check of the Multi-System: From MOBIUS Water Heater Model T-M1 Computer Board, it has
a jump cable for Single mode or Multi mode.
To switch to Multi mode, this jump cable has to be removed from the T-M1 computer board
permanently, but please keep this jump connector safety stored for future maintenance (this jumper is
located behind the “do not remove” label.
Firing System: Power on each T-M1 and TM-RE20, then TM-RE10 will show Number 0000 for 20 to
25 second. Next, the RE-10 will show a default temperature setting of 108F this can be changed with
HOT and COLD button located on the TM-RE10. If you press the ON/OFF button this time, RE10
shows current TIME that can be changed, refer to the instructions provided with the TM-RE10. After
setting of the TIME, press the ON/OFF button, RE-10 will show current Temperature setting.
24
LP or Natural Gas, Please don’t change
these switch, Factory already set it
correctly.
When unit is firing, this RED LED will
be ON
For Single or Multi mode JUMP cable.
For Multi mode, permanently pull out.
Error signal LED, this LED shows for unit error,
also it will show on RE-10 and RE20. Error codes
are in Installation Manual Book
Standby Light with Green LED, ON light mean Unit
is ready to fire.
When Unit is ON, upper RED LED will be ON also.
25
warranty and shorten the life of your water
heater.
Maintenance and Service
WARNING: Turn off the electrical power
supply, the manual gas control valve, and
the manual water control valve before
servicing.
Common Trouble Shooting
Water Isn’t Hot Enough
The T-M1 can burn gas at a maximum
input rate of 235,000 BTUH. This puts a
limit on the possible output temperature
and flow capabilities (See flow chart on the
last page of this manual). If the water
doesn’t seem hot enough, compare the
flow and temperature that is being attained
to the T-M1 flow vs. temperature chart. If
the unit is not performing according to the
chart, first check that the gas supply line is
sized properly, and that the gas pressure is
within the required range. If the gas line is
okay, check the plumbing for mixing
valves,
thermostatic
valves,
scald
protection, single handled valves or
crossed connections. If the unit is
performing in accordance with the flow
chart, then 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 with the dipswitches on the unit.
Do this immediately after installation.
1. Cleaning 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 the exhaust vent pipe 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.
It Takes Too Long to Get Hot Water
The unit should be checked once a year or as
necessary by a certified and trained technician.
If repairs are needed, any repairs should be
done by a certified and trained technician.
The T-M1 takes three seconds to ignite, and
three more to get up to temperature. The rest
of the time needed for hot water to get to a
fixture is due to the length of piping between
the water heater and the fixture. If the unit
seems to be taking longer than six seconds to
initiate, check the filter and flow sensor for any
debris or damage.
The following systems and parts should be
checked at least once a year:
1. Venting systems
2. Burners
3. Manual operation of the pressure relief
valve to ensure correct operation.
4. Periodic cleaning of the water filter, refer to
figure below.
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
The T-M1 Will Not Initiate
First check the flow rate through the unit. If the
flow is not .75 GPM or greater, the unit will not
initiate. Check the filter and the flow sensor for
any debris or damage.
Press the lower green button on the GFCI
inside the unit. If the red light above it does not
come on, then there is a problem with the
26
electrical supply to the unit. If that light does
come on, hit the green reset button above the
light, and look for the green light on the circuit
plate at the top left of the unit. If this light is not
lit, there is a problem with the electrical
connection between the GFCI and the circuit
plate. Contact Takagi Industrial Company for
Instructions.
More detail error code can be found at
Trouble shooting Diagnose Flow Chart.
Error Codes
All Takagi units are self diagnostic for errors. If
there is a problem with the installation or the
unit, it will give a signal, through a pair of
flashing lights on the circuit plate or error
display on circuit board LED display to
communicate the source of the problem. If the
unit has a TK-RE10 remote control installed,
this will give also give a numerical error code.
Consult the following chart for the meaning of
an error code:
TK-RE10
MOBIUS Water Heater Model T-M1 has a built
in self-diagnostic computer programmed for
safety and convenience for trouble shooting
and maintenance service.
On the T-M1 Computer Board, a numeric
display will notify of any error by displaying a
numeric code when the MOBIUS water heater
has or encounters a problem. This numeric
code will give symptoms for trouble shooting
and maintenance service.
The T-M1 consists of five major components:
Temperature control, Gas control, Water
control, Burner Control, and Main computer
control.
Error N0.
031,141,711,741, 751
701
111, 121
311, 321,331
391,611,721,991
501
651, 661,541
101
Error Code as
Three digit Numeric
numbers
Component
Main Computer
Control
Temperature
Control
(Setting Temp. +
over 50 °F)
Burner Flame
Temperature
control
Burner control
Gas control
Water control
Combustible Air
Refer to page 31 for additional error codes.
27
②
①
⑧
B
④
③
⑱
Open Valve A
*1
Control Valve B
YES
Set Temperature
<=120F
YES
YES
Valve C
Close limit Off
Flow Sensor
>=0.75 GPM
Faucet open
YES
YES
Pre-check
Normal
Valve A
Open limit On
Display:
Display: Priority
Operation Switch ON
YES
YES
Valve C
Open limit On
②
Valve A
Open limit On
Open Valve C
Open Valve B
Open Valve A
YES
Valve B
Open limit On
①
②
⑰
④
Power On
NO
*2
Open Valve B
NO
(After 18 sec.)
NO
NO
NO
(After 18 sec.)
NO
(After 18 sec.)
NO
(After 18 sec.)
NO
(After 18 sec.)
Start
C
*3
⑥
⑤
*4
*5 *6
Valve H failure
Lost flame
Ignite failure
611
661
28
High-limit switch
Abnormal Burning
Abnormal High Temp.
Circuit board
Valve C failure
Valve B failure
Open Short:
Output Temp. Thermistor
Open Short:
Mixing Temp. Thermistor
Open Short:
Inlet Temp. Thermistor
Gas valve circuit
board failure
Abnormal fan rotation
Valve B failure
541
651
Valve C failure
Valve C failure
721
031
701
331
311
321
141
711
541
Flame failure
Mismatched gas
Circuit board failure
Open Short:
Inlet Temp. Thermistor
Open Short:
Output Temp. Thermistor
Open Short:
Mixing Temp. Thermistor
High-limit switch off
Circuit board for valve D.E.F Failure
Valve A failure
141
991
701
651
661
331
311
321
711
510
121
111
(After 35 sec.)
Fan off
*13
Valve F off
Valve G off
Valve E off
Valve D off
Valve H off
Fan off
611
Faucet close
Flow sensor off
Operation switch off
Power off
All display off
Maintenance
MOBIUS
Water Heater
Model T-M1
Trouble Shooting
Diagnose
Flow - Chart
Check flame
(>1.0μA)
YES
⑦
Open Valve B
improperly
Check power
Less normal?
YES
Check output temp.
=<203F
YES
Proportional control
Igniter Off
Display: Running
Thermo fuse
Normal
YES
Valve G On
Valve D On
Valve H On
⑮
⑭
⑬
Igniter On
No flame
(>0.15μA)
YES
⑦
⑫
Fan motor rotation
(>1000rpm)
YES
Fan motor On
Fan motor rotation
(<1000rpm)
YES
Valve A
Open limit On
YES
⑪
⑩
⑨
*1
NO
NO
NO
(After 10 sec.)
NO
(After 3 sec.)
(After 5 sec.)
NO
(After 5 sec.)
NO
NO
(After 20 sec.)
NO
(After 20 sec.)
NO
(After 18 sec.)
*2
YES
*4
YES
Fan Off
< 2 minutes
Igniter Off
Valve E Off
NO
A
29
101
Display: Running Off
Valve F Off
Valve G Off
Valve D Off
Valve G Off
Valve H Off
*6
Valve D Off
NO
*5
Valve H Off
Re-ignite
(=< 2 times)
*3
E
D
B
Valve A
Close limit On
YES
Valve A close
Valve B open
Fan motor Off
Display: running Off
Flame detection Off
Valve G Off
Valve D Off
No flame
(>0.15μA)
YES
YES
Pass 5 sec.
Valve F Off
Valve E Off
Valve H Off
Flow sensor off
Faucet close
Stop
⑬
⑨
(After 18 sec.)
NO
(After 10 min.)
C
A
510 Blink
(After 35 sec.)
NO
NO
YES
NO
Flow sensor
=< 8.45GPM
YES
E
NO
Start
Safety function
YES
Abnormal burning
Abnormal fan rotation
(=<1000rpm)
when differential
=>±200rpm with setting
Valve C control
Flow sensor
=< 8.45GPM
YES
NO
Flow sensor
=> 8.45GPM
YES
Valve C control
Capacity Check
=< Max. BTU
YES
NO
*13
NO
NO
(After 60 sec.)
Valve C Close
YES
Capacity Check
=> Max. BTU
YES
Valve C Open
NO
NO
Output temp down
Capacity check
=< Max. BTU
YES
Valve F Off
Valve E Off
Check power
=< Min. BTU
YES
NO
YES
Fan speed up
=>15%
YES
Thermocouple
=< 10mV
YES
30
Thermocouple
=< 12mV
Display: 101
NO
NO
YES
NO
Fan speed up 3%
NO
Thermocouple
=< 10mV
Thermocouple
=> 1mV
YES
Valve F On
Valve F Off
Thermocouple
=> 1mV
YES
Valve E On
NO
NO
D
Valve E On
Check power
=< Mid. BTU
YES
Max burning power: 12
661
NO
Solenoid Valve 2
Solenoid Valve 3
Proportional Valve
Gas Inlet Valve
Valve E
Valve F
Valve G
Valve H
Symptom
Wrong Gas Type
Insufficient Gas Supply
Ignition failed
Loss Flame
Hi-Limit Switch Trip
Output Thermistor Fail
Inlet Thermistor Fail
Vent Pipe
Solenoid Valve 1
Error
31
101
111
121
141
311
321
211
Thermo fuse cut off
(=>360F)
Open Short:
Inlet Temp. Thermistor
Open Short:
Output Temp. Thermistor
Open Short:
Mixing Temp. Thermistor
Error
331
391
510
541
611
651
661
441
Flame detector
Display: running off
31
Symptom
Mixing Thermistor Fail
Abnormal Thermocouple
Abnormal Main Gas Valve
Abnormal Two-Way Valve
Abnormal Fan Motor
Abnormal Bypass Valve
Abnormal Output Adjust Valve
Flow Sensor
Water Outlet Valve (Two way valve)
By-Pass Water Control Valve
Water Control Valve
Valve D
<Gas Valve>
<Wter Valve>
Valve A
Valve B
Valve C
⑥
Abnormal high water
temperature
Circuit board for Valve D
failure
Hi-limit switch works
(=>208F)
Error
701
711
721
741
751
761
991
Symptom
Abnormal Mixing Thermistor
Abnormal Gas Solenoid Valve
Computer Pre-post Check Problem
Main remote control Trouble
Temperature Remote control Trouble
Multi-system Controller
Abnormal Burning
MOBIUS Water Heater
Parts List and Component Diagram
14
16
17
18
15
19
20
22
21
18
24
26 25
23
20
18
51
28
27
29
30
36
35
55
56
57
58
39
26
31
60
29
47
46
45
48
56
34
59
49
60
61
40
40
42
94
34
20
44
41
43
54
32
35 34
37 38
53
40
34
31
33
52
63
40
62
64
65
66
50
32
48
111
18
114
112
115
113
116
118
115
121
117
120
122
119
123
124
9
125
126
127
128
33
67
68
18
69
70
71
70
73
74
75
84
72
83
70
76
78
75
81
80
70
74
77
9
9
90
79
87
91
89
88
70
85
86
40
82
101
43
102
100
95
99
104
92
103
94
98
96
105
93
107
108
106
110
97
94
3
109
34
3
2
1
3
4
13
5
6
2
7
8
9
11
12
3
35
10
3
Parts List
Part No.
Description
Part No.
Description
1
Case Assembly
35
Screw M4 x 12
2
Brackets
36
Flange
3
Screw (W) M4 x 10
37
Flow Adjustment Valve
4
Back Guard Panel
38
O-ring P16
5
Transformer
39
Bypass Junction
6
Transformer
40
Screw M4 x 6
7
Junction Box
41
O-ring P18
8
Junction Box Cover
42
Water Outlet Connection
9
Screw M4 x 8
43
Screw M4 x 14
10
Sound Insulation
44
Mixing Thermistor
11
Screw M4 x 8 (Coated)
45
O-ring P6
12
Weather Protection Panel
46
Drain Plug
13
Front Cover
47
Mixing Connection
14
Exhaust Pipe
48
Drain Plug Band
15
Heat Exchanger Assembly
49
Water Outlet
16
Hi-Limit Switch
50
Screw (W) M4 x 12
17
Screw M3 x 6
51
Bypass Flow Adjustment Valve
18
Screw M4 x 10 (coated)
52
Bypass Valve
19
Outlet-Thermistor
53
Silicon O-ring M22
20
O-ring P4
54
Bypass Connection
21
Heater Block 604
55
O-ring JASO3 #1017
22
Heat Exchanger Fixing Plate (Back)
56
Clamp
23
Heat Exchanger Fixing Plate (Front)
57
Heater Fixing Plate
24
Over Heat Cut Off Fuse Fixing Plate
58
Screw M4 x 6
25
Over Heat Cut Off Fuse
59
Flow Sensor
26
Heater Block Fixing Plate
60
Heater 102
27
Inlet-Thermistor
61
Magnetic Protection Plate
28
Two Way Valve Cover
62
O-ring JASO #1019
29
Silicon O-ring M26
63
Screw M4 x 14 (coated)
30
Two Way Valve Assembly
64
Water Inlet
31
O-ring P20
65
O-ring P25
32
Screw M4 x 8
66
Filter
33
Quick Release Plate
67
Packing
34
O-ring JASO#1017
68
Combustion Chamber
36
69
Burner Assembly
99
Igniter
70
Screw M4- 12
100
Screw M4 x 6
71
Wire Holder
101
Solenoid Valve Wire
72
Spark Electrode Holder Packing
102
Proportional Valve Wire
73
Spark Electrode Holder
103
Gas Valve Unit
74
Screw M4 x 10
104
O-ring P22
75
Silicon Cap
105
O-ring P18
76
Spark Electrode Fixing Plate
106
Screw M4 x 8
77
High Voltage Igniter Cable
107
O-ring P26
78
O-ring (seal)
108
Gas Inlet
79
Thermo couple
109
Gas Filter
80
Thermo couple Fixing Plate
110
Gas Inlet Fixing Plate
81
Overheat Cut off Fuse
111
Computer Board
82
Damper
112
Computer Board Sticker
83
Washer
113
Mode Port
84
Pressure Switch Port
114
Control Box
85
Silicon Tube
115
Screw M3 x 25
86
Pressure Switch
116
Wire Holder
87
Fan Motor
117
Terminal Holder
88
Screw M4 x 12 Hex
118
Surge Absorber: A
89
Thermostat
119
Surge Absorber: B
90
Screw (W) M3 x 10
120
Screw M4 x 16
91
Manifold
121
Terminal
92
Manifold Gas Pressure Port
122
Power Distribution Plate
93
Gasket
123
Ground Fault Circuit Interrupter
94
Screw M4 x 12
124
Fuse Box
95
Manifold Gas Pressure Tap
125
Fuse
96
Gas Coupling
126
Fuse Cover
97
Screw M4 x 8 (Washer & Hex Head)
127
Remote Control Terminal
98
Igniter Fixing Plate
128
Screw M3 x 12
37
Out Put Hot Water GPM
8.5
9.6
40 F
50 F
70 F
60 F
95
7.0
90
7.7
0.0
2.0
4.0
6.0
8.0
10.0
12.0
7.0
8.5
9.6
5.9
105
7.7
6.4
100
7.0
8.5
9.6
5.9
5.1
115
7.7
6.4
5.5
110
7.7
6.4
5.5
4.8
7.0
5.9
5.1
4.5
125
6.4
5.5
4.8
4.3
130
5.9
5.1
4.5
4.0
135
38
50 F
60 F
5.5
4.8
4.3
3.8
140
70 F
Out put Hot Water Temperature
40 F
120
4.8
4.3
3.8
3.5
150
4.3
3.8
3.5
3.2
160
Out Put Temperature vs. GPM (Max. 9.6 GPM) with Various Ground Water Temperature
Correct Gas pipe size can be expect this chart
4.0
3.7
3.3
3.1
165
3.8
3.5
3.2
3.0
170
3.7
3.3
3.1
2.8
175
3.5
3.2
3.0
2.7
180
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising