Takagi T-H3J-DV / 240H User manual

Gas Tankless Water HeaterTM
Suitable for potable water heating and space-heating
Please refer to local codes for space-heating compliance.
T-H3-DV / 540H
model only
If you have any questions, please
call 1-888-479-8324
WARNING
- 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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.
- Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
On-Demand Water Heater
Installation Manual and Owner’s Guide
ANSI Z21.10.3 and CSA 4.3
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death.
FEATURING
 • ENDLESSHOTWATER
 • ON-DEMANDUSAGE
 • COMPACT,SPACESAVING
 • ENERGYCONSERVATION
 • COMPUTERIZEDSAFETY
 • NOPILOTLIGHT
 • EASY-LINKSYSTEM*
 • MULTI-UNITSYSTEM*
 • COMMERCIALGRADECOPPER*
  *(T-H3-DV / 540H model only)
R
DR
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
Models
89V012-3
REV. 03 (04-15)

2Page
Contents
CONTENTS
Installation Manual
SPECIFICATIONS.......................................................................................................................... 4
INTRODUCTION .......................................................................................................................... 5
SAFETY GUIDELINES.................................................................................................................... 6
INSTALLATION............................................................................................................................. 7
General.....................................................................................................................................7
Clearances................................................................................................................................9
Included accessories................................................................................................................9
Optional items............................................................................................................................9
Warning for installations........................................................................................................11
High-altitudeinstallations......................................................................................................12
VentingInstructions...............................................................................................................13
Gas supply and gas pipe sizing...............................................................................................23
Water connections................................................................................................................25
Condensate drain..................................................................................................................26
Electrical connections............................................................................................................28
Easy-Link System....................................................................................................................29
Multi-UnitSystem..................................................................................................................33
APPLICATIONS............................................................................................................................34
INITIAL OPERATION...................................................................................................................36
Owner's Guide
OPERATING SAFETY .................................................................................................................. 38
NORMAL OPERATION ............................................................................................................... 40
Temperature controller and Remote controller.....................................................................40
General...................................................................................................................................40
Temperaturesettings.............................................................................................................41
Temperature table of controller.............................................................................................41
Additionalfeatures.................................................................................................................42
Temperature settings on the PCB (Without remote controller)............................................43
Flow.......................................................................................................................................44
Freeze protection system.......................................................................................................44
Maintenance and service.......................................................................................................45
Unit draining and filter cleaning............................................................................................45
Descaling...............................................................................................................................46
TROUBLESHOOTING...................................................................................................................47
General...................................................................................................................................47
Error codes............................................................................................................................49
COMPONENTSDIAGRAM...........................................................................................................52
PARTS LIST.................................................................................................................................................57
OUTPUT TEMPERATURE CHART................................................................................................59
LIMITED WARRANTY..................................................................................................................60

3Page
Installaon Manual
Installation Manual
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater.
Before use, we recommend that you read through this safety manual
carefully. Please refer to the back of the manual for details about the
warranty. Keep this manual for future reference.
If you lose the manual, contact the manufacturer, your local distributor,
or download from the manufacturer's website. When you call, please
tell us the model number and the serial number of your unit written on
the rating plate of the water heater.

4Page
SPECIFICATIONS
*275790 pa (40 psi) or above is recommended for maximum flow.
** The Manifold Pressure is the factory setting and generally should not need adjustment.
NOTE:
• Checktheratingplatetoensurethisproductmatchesyourspecificationsbeforeinstallation.
• InaccordancewithCSA4.3,COemissiondoesnotexceed400ppmfornormalinput.
• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligation.
Specicaons
Installaon Manual
Model T-H3J-DV / 240H T-H3S-DV / 340H T-H3-DV / 540H
Natural Gas Input
(Operating Range) BTU/h Min.: 15,000 Max.: 160,000
Min.: 15,000
Max.: 180,000
Min.: 15,000
Max.: 199,000
Propane Input
(Operating Range) BTU/h Min.: 13,000 Max.: 160,000
Min.: 13,000
Max.: 180,000
Min.: 13,000
Max.: 199,000
Gas Connection 3/4" NPT
Water Connections 3/4" NPT
Water Pressure* MPa
(psi) 0.1 - 1 (15 - 150)
Natural gas
Inlet Pressure
kPa
(" W.C.)
Min. 1.24 (5.0)
Max. 2.61 (10.5)
Propane
Inlet Pressure
MPa
(" W.C.)
Min. 1.99 (8.0)
Max. 3.48 (14.0)
Manifold
Pressure**
Natural
Gas
Pa
(" W.C.)
373
(1.50)
610
(2.45)
734
(2.95)
Propane Pa
(" W.C.)
523
(2.10)
672
(2.7)
821
(3.3)
Weight kg (lbs.) 26.3 (58) 26.3 (58) 26.8 (59)
Dimensions mm H 570 x W 450 x D 272
H 22-1/2 x W 17-3/4 x D 10-3/4
inch
Ignition Electric Ignition
Electric
Supply VAC / Hz 120 / 60
Consumption
Operation W / A 72.7 / 0.61 78.2 / 0.65 89.0 / 0.74
Standby W / A 3.1 / 0.03 3.1 / 0.03 4.2 / 0.04
Freeze-
Protection W / A 174 / 1.5 174 / 1.5 175 / 1.5

5Page
INTRODUCTION
• This manual provides information necessary for the installation, operation, and maintenance
of the water heater.
• The model description is listed on the rating plate which is attached to the side panel of the
water heater.
• Please read all installation instructions completely before installing this product.
• If you have any problems or questions regarding this equipment, consult the manufacturer or
its local representative or call an HVAC technician or qualified plumber in your area.
• This equipment is an on-demand, tankless water heater designed to efficiently supply endless
hot water for your needs.
• These high-efficiency models have a built-in secondary heat exchanger that absorbs latent
heat from the exhaust gas.
• The T-H3J-DV / 240H, T-H3S-DV / 340H and T-H3-DV / 540H models are only to be installed
indoors.
• The principle behind tankless water heaters is simple:
*This diagram illustrates tankless water heater design concepts only and does not accurately
represent the water heater’s physical description.
1. A hot water tap is turned on.
2. Water enters the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and sends a signal to the igniter to create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates
the gas and water valves to ensure proper output water temperature.
8. When the tap is turned off, the unit shuts down.
Introducon
Installaon Manual
Exhaust
Secondary
heat exchanger
Intake port
Condensate
drain port
Cold water inlet
Gas
Hot water outlet
Computer board Fan motor
Gas valves
Thermistor
Burners
Thermistor
Bypass valve
Primary
heat exchanger
Exhaust thermistor
Water control valve
Thermistor
Flow sensor

6Page
SAFETY GUIDELINES
SAFETY DEFINITION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the most recent edition of CSA B149.1,
Natural Gas and propane installation code.
2. Properly ground the unit in accordance with all local codes or in the absence of local codes, with CSA
standard C22.1 Canadian Electrical Code Part 1.
3. Carefully plan where you intend to install the water heater. Please ensure:
•Yourwaterheaterwillhaveenoughcombustibleairandproperventilation.
•Locateyourheaterwherewaterleakagewillnotdamagesurroundingareas.(Pleasereferto
p. 8.)
4. Check the rating plate for the correct GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC
RATING.
*If this unit does not match your requirements, do not install and consult with the manufacturer.
5. If any problem should occur, turn off all hot water taps and turn off the gas. Then call a trained
technician or the Gas Company or the manufacturer.
WARNING
Indicates an imminently hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION
Indicates an imminently hazardous situation which, if not avoided, could result
in minor or moderate injury.
Safety Guidelines
Installaon Manual
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
DANGER
WARNING
• Water temperatures over 52 °C (125 °F) can cause severe burns instantly or
death from scalding. The water temperature is set at 50 °C (120 °F) from the
factory to minimize any scalding risk. Before bathing or showering always
check the water temperature.
• Do not store or use gasoline or other flammables, vapors, or liquids in the
vicinity of this appliance.
• Do not reverse the water and/or gas connections as this will damage the gas
valves and can cause severe injury or death. Follow the diagram on p. 25
when installing your water heater.
• Do not use this appliance if any part has been in contact with or been
immersed in water. Immediately call a licensed plumber, a licensed gas
fitter, or a professional service technician to inspect and/or service the unit if
necessary.
• Do not disconnect the electrical supply if the ambient temperature will drop
below freezing. The Freeze Protection System only works if the unit has
electrical power. The heat exchanger will not be covered under warranty if
it is damaged due to freezing. Refer to the section on the Freeze Protection
System on p. 44 for more information.

7Page
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the most recent edition of CSA B149.1,
Natural Gas and propane installation code.
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.
This manual must be followed exactly. Read the “Safety Guidelines” section.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need
adjustment.
4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily.
Refer to the "Clearances" section on p. 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible air will be
available to it at all times without obstructions.
6. The electrical connection requires a means of disconnection, to terminate power to the water heater
for servicing and safety purposes.
7. 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 meets the required distance by
local code from any doorway or opening to prevent exhaust from entering a building. (Refer to p. 20.)
8. Particles from flour, aerosols, clothes dryers and other airborne contaminants may clog the air vent,
build up and reduce the functions of the rotating fan, cause improper burning of the gas, or cause
damage to the water heater. Regularly ensure that the area around the unit is dust- or debris-free.
Regular maintenance is recommended for these types of environments.
9. T-H3J-DV / 240H, T-H3S-DV / 340H, and T-H3-DV / 540H models are to be installed indoors only.
These units are equipped with a thermistor and hi-limit switch for the exhaust gas, detecting excess
temperatures within the flue and enabling the unit to safely stop operations if needed. These
components are always monitoring exhaust gas conditions in order to prevent heat damage to PVC,
CPVC or Polypropylene (Plastic) venting if PVC, CPVC or Polypropylene is used.
If the exhaust gas temperature exceeds 60 °C (140 °F), these components will enable the unit to safely
stop operations.
•These models require a 3" or 4" make-up intake air supply pipe. The intake pipe must be sealed
airtight.
•Air supply pipe can be made of PVC, CPVC , Polypropylene, corrugated stainless steel, Category
lll / IV stainless steel, ABS, or aluminum flexible tube. Regarding exhaust pipe, refer to p. 14 to
19.
•Sidewall venting is recommended for these models. Vertical venting (roof termination) is
acceptable.
•The manufacturer recommends running the exhaust vent and the intake pipe as parallel as
possible.
Installaon
Installaon Manual

8Page
INCLUDED ACCESSORIES
OPTIONAL ITEMS
• Installation and service must be performed by a qualified installer (for
example, a licensed plumber or gas fitter), otherwise the warranty will be
void.
• The installer (licensed professional) is responsible for the correct installation
of the water heater and for compliance with all national, state / provincial,
and local codes.
• The manufacturer does not recommend installing the water heater in a pit or
location where gas and water can accumulate.
• Do not have the vent terminal pointing toward any operating window, door, or
opening into a building.
• Do not install next to any source of airborne debris, such as a clothes dryer,
that can cause debris to be trapped inside the combustion chamber, unless the
system is direct-vented.
• The manufacturer does not recommend installing the water heater in an attic
due to safety issues. If you install the water heater in an attic:
• Make sure the unit will have enough combustion air and proper
ventilation.
• Keep the area around the water heater clean. When dust collects on the
flame sensor, the water heater will shut down on an error code.
• Place the unit for easy access for service and maintenance.
• A drain pan, or other means of protection against water damage, is
required to be installed under the water heater in case of leaks.
WARNING
• The warranty will not cover damage caused by water quality.
• Only potable water can be used with this water heater. Do not introduce
pool or spa water, or any chemically treated water into the water heater.
• Water hardness levels must not exceed 7 grains per gallon (120 ppm) for
single family domestic applications or more than 4 grains per gallon (70
ppm) for all other types of applications. Water hardness leads to scale
formation and may affect / damage the water heater. Hard water scaling
must be avoided or controlled by proper water treatment.
• Water pH levels must be between 6.5 and 8.5
• Well water must be treated.
• Do not install the unit where water, debris, or flammable vapors may get into
the flue terminal.
• Although the water heater is designed to operate with minimal sound, the
manufacturer does not recommend installing the unit on a wall adjacent to a
bedroom, or a room that is intended for quiet study or meditation, etc.
• Locate your heater close to a drain where water leakage will not do damage
to surrounding areas. As with any water heating appliance, the potential for
leakage at some time in the life of the product does exist. The manufacturer
will not be responsible for any water damage that may occur. If you install a
drain pan under the unit, ensure that it will not restrict the combustion air flow.
CAUTION
Installaon
Installaon Manual

9Page
Maintain all clearances around
the water heater.
CLEARANCES
Installaon
Installaon Manual
INCLUDED ACCESSORIES
Check that these items below are included with the water heater.
Installation Manual
and Owner’s Guide
Communication Cable
T-H3-DV / 540H only
Qty: 1 Qty: 1
Model Top Bottom Front Back Sides
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
305 mm
(12 in.)
305 mm
(12 in.)
102 mm*
(4 in.)
13 mm
(0.5 in.)
76 mm
(3 in.)
*610 mm (24 inches) recommended for maintenance.
OPTIONAL ITEMS
#Model T-H3J-DV / 240H T-H3S-DV / 340H T-H3-DV / 540H
1. Temperature remote controller ✓ ✓ ✓
2. N/A
3. Pipe cover ✓ ✓ ✓
4. Neutralizer kit ✓ ✓ ✓
5. Sidewall vent terminator (Hood)
and Wall thimble ✓ ✓ ✓
6. 3" ULC S636 PVC Concentric termination ✓ ✓ ✓
7. Non-return valve ✓ ✓ ✓
Back
Side
Front
Side
Top
Boom

10 Page
The pipe cover protects the
plumbing pipes to the water
heater from unexpected
adjustments.
6. 3 inch ULC S636 PVC Concentric termination: TH-CVPVC33
NOTE: Concentric (single penetration) terminations are only permitted for sidewall (horizontal)
terminations. Roof (vertical) terminations must use two separate penetrations.
Installaon
Installaon Manual
The temperature remote controller has
three functions. It allows the output
temperature from the water heater to
be adjusted, and it also works as a
diagnostic tool and it provides a concise
error code whenever there is a problem
with the unit. Refer to p. 40 to 42 for
more information.
1. Temperature remote controller:
TM-RE42-Standard model/TM-RE40
3. Pipe cover: TH-PC03 4. Neutralizer kit: TH-NT01
The neutralizer assembly
neutralizes the condensate
(acidic water) that forms in the
secondary heat exchanger of the
water heater.
It connects to the condensate
drain port of the water heater by
using connectors included with
the neutralizer kit. Refer to p. 25
for the details.
5. Wall thimble and Sidewall vent terminations
See the troubleshooting section (p. 49 to 52) for
information on possible error codes.
This pipe cover is fixed to the bottom of the water
heater, which hides the plumbing and improves
the visual aspects of the whole installation for the
water heater.
Used when terminating direct-vent (sealed combustion) systems, with
direct-vent models that require a 76 mm (3 in.) intake and a 76 mm
(3 in.) exhaust. This concentric termination provides the convenience
of only having to make one penetration through a sidewall instead
of two separate penetrations for the intake and exhaust piping. The
termination includes a bird screen, restricting small animals, pests, and
foreign objects from entering into the vent system.
Wall thimble Termination Hood
Termination Box
Covering wall thicknesses Part#
Wall Thimble 4 - 7 in. 2SVSWTF04
Wall Thimble 5 - 10 in. 2SVSWTEF04
Termination Hood 2SVSHTX04
Termination Box 2SVSRTF04
They are used when venting out through the wall. These terminations
are special stainless steel vents for gas appliances and are UL listed as
Category II, III and IV. For different wall thicknesses, there are two ranges
of lengths available. (Refer to the Flexmaster brochure for details.) Install
these vent terminations in accordance with their installation instructions
and any applicable local code.
2. N/A

11 Page
WARNING FOR INSTALLATIONS
Installaon
Installaon Manual
FOR YOUR SAFETY, READ BEFORE INSTALLATION:
• Do not install the heater where water, debris, or flammable vapors may get
into the flue terminal. This may cause damage to the heater and void the
warranty.
• 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.
• Do not install the water heater vent terminator within 914 mm (3 ft.) of any
air intake or building opening. (Refer to p. 20.)
• Do not install next to a dryer or any source of airborne debris that can be
trapped inside the combustion chamber, unless the system is direct-vented.
Vent
Terminal
V
3 ft. (914 mm)
Canada
3 ft. (914 mm)
Canada
3 ft. (914 mm)
Canada
Prohibited
WARNING
7. Non-return valve: 9008847005
It is a must-have item for common venting system. It prevents
the escape of combustion gas through non-operating appliances.
(Refer to p. 18 and 19.)

12 Page
HIGH-ALTITUDE INSTALLATIONS
Check the elevation where your water heater is installed. Set DIP switches shown in the table below
depending on the altitude.
WARNING
Please be sure to adjust the DIP switches on the lower bank of the
computer board of T-H3-DV / 540H for altitude setting adjustments.
Installaon
Installaon Manual
T-H3-DV / 540H
Computer board
Lower bank of DIP switches
Bank of DIP switches
T-H3J-DV / 240H and T-H3S-DV / 340H
Computer board
NOTE: The dark squares indicate the direction the DIP switches should be set to.
*The maximum allowable altitude is 3,100 m (10,100 ft.)
0 to 610 m
(0 to 2,000 ft.)
(DEFAULT)
611 to 914 m
(2,001 to
3,000 ft.)
915 to 1,523 m
(3,001 to
5,000 ft.)
1,524 to 2,285 m
(5,001 to
7,500 ft.)
2,286 to 3,100 m
(7,501 to
10,100 ft.)*
T-H3J-DV / 240H and
T-H3S-DV / 340H No. 3 : OFF
No. 4 : OFF
No. 5 : OFF
No. 3 : OFF
No. 4 : ON
No. 5 : OFF
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
No. 3 : OFF
No. 4 : ON
No. 5 : ON
No. 3 : ON
No. 4 : ON
No. 5 : ON
T-H3-DV / 540H
(Lower bank of
DIP switches) No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
No. 2 : OFF
No. 3 : ON
No. 4 : OFF
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
No. 2 : OFF
No. 3 : ON
No. 4 : ON
No. 2 : ON
No. 3 : ON
No. 4 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
12345678910
OFF
ON
12345678910
OFF
ON
12345678910
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
Altitude
DIP switches

13 Page
VENTING INSTRUCTIONS
-General-
T-H3J-DV / 240H, T-H3S-DV / 340H, and T-H3-DV / 540H models must be vented in accordance with the
section “Venting of Equipment" of the latest edition of CSA B149.1, Natural Gas and propane installation
code, as well as applicable local building codes.
The use of venting materials approved for Category III/IV appliances is recommended whenever
possible. However, these models may also be vented with plastic pipe materials such as PVC, CPVC,
and Polypropylene. For details, please refer to the Exhaust Vent (Plastic vent) section from p. 14. Vent
installations in Canada which utilize plastic vent systems must use venting that is ULC S636 certified.
General rules for venting water heaters are:
• Place the water heater as close as possible to the vent termination.
• The vent collar of the water heater must be fastened directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the water heater’s vent collar.
• Do not cut the vent collar of the water heater.
• The vent must be easily removable from the top of the water heater for normal service and
inspection of the unit.
• The water heater vent must not be connected to any other gas appliance or vent stack except an
approved common-venting system. (Refer to p. 18 and 19.)
• Avoid using an oversized vent pipe or using extremely long runs of the pipe unless it is part of an
approved common vent system.
• For rooftop venting, a rain cap or other form of termination that prevents rain water from
entering into the water heater must be installed.
• Do not terminate vent into a chimney. If the vent must go through the chimney, the vent must
run all the way through the chimney with approved vent pipe.
General rules for vent terminations:
• Avoid locating the water heater vent termination near any air intake devices. 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.
• Locate the vent termination so that it cannot be blocked by any debris, at any time. Most codes
require that the termination be at least 305 mm (12 in.) above grade and anticipated snow line,
but the installer may determine that it should be higher, depending on the job site condition and
applicable local codes.
• A proper sidewall termination is recommended when the water heater is vented through a
sidewall.
• Regarding the clearances from the exhaust termination to the air inlet or opening, refer to p. 20
to 22.
• Improper venting of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or death.
• Improper installation can cause nausea or asphyxiation, severe injury or death
from carbon monoxide and flue gases poisoning. Improper installation will
void product warranty.
DANGER
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.
CAUTION
Installaon
Installaon Manual

14 Page
-DIP switch settings for Vent length-
-Exhaust vent (Plasc vent)-
These models can be vented with a plastic vent which is made of PVC, CPVC, or polypropylene
(temperature rated up to 149 °F). In Canada, plastic venting must be certified to ULC S636 standards.
Item Material Canada
Exhaust pipe and
Fittings
Schedule 40 PVC
ULC S636 Certified
Materials Only
Schedule 40/80 CPVC
Polypropylene
Pipe Cement/Primer PVC
CPVC
NOTE: Do NOT Use Cellular Foam Core Pipe
102 mm (4") venting
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
(Upper bank of DIP switches) Vent length
No. 6 : ON
No. 7 : OFF
No. 3 : ON
No. 4 : OFF
1.5 to 15.2 m
(5 to 50 ft.)
(DEFAULT)
No. 6 : OFF
No. 7 : OFF
No. 3 : OFF
No. 4 : OFF
15.5 to 30.5 m
(51 to 100 ft.)
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
76 mm (3") venting
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
(Upper bank of DIP switches) Vent length
No. 6 : ON
No. 7 : OFF
No. 3 : ON
No. 4 : OFF
1.5 to 6.1 m
(5 to 20 ft.)
(DEFAULT)
No. 6 : OFF
No. 7 : OFF
No. 3 : OFF
No. 4 : OFF
6.4 to 12.2 m
(21 to 40 ft.)
No. 6 : ON
No. 7 : ON
No. 3 : ON
No. 4 : ON
12.5 to 21.3 m
(41 to 70 ft.)
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8
OFF
ON
1 2 3 4 5 6 7 8 9 10
Set DIP switches shown in the table below depending on the vent length.
Installaon
Installaon Manual

15 Page
• The maximum length of exhaust vent piping must not exceed 21.3 m (70 ft.) for 76 mm (3”)
venting, which depends on the elevation where the water heater is installed. 30.5 m (100 ft.)
for 102 mm (4”) venting (deducting 1.5 m (5 ft.) for each elbow used in the venting system). Do
not use more than 5 elbows. See the table below.
• When the horizontal vent run exceeds 1.5 m (5 ft.), support the vent run at 0.9 m (3 ft.) intervals
with overhead hangers.
-Plasc Venng Illustraons-
For details of the optional items, refer to the Installation manual for each Optional item.
Installaon
Installaon Manual
No. of Elbows
Max. Vertical or Horizontal (Total) Vent Length
76 mm (3") venting 102 mm (4") venting
Elevations
0 to 914 m
(0 to 3,000 ft.)
Elevations
915 to 1,828 m
(3,001 to 6,000 ft.)
Elevations
1,829 to 3,100 m
(6,001 to 10,100 ft.)
Elevations
0 to 3,100 m
(0 to 10,100 ft.)
021.3 m (70 ft.) 12.2 m (40 ft.) 7.6 m (25 ft.) 30.5 m (100 ft.)
119.8 m (65 ft.) 10.7 m (35 ft.) 6.1 m (20 ft.) 29.0 m (95 ft.)
218.3 m (60 ft.) 9.1 m (30 ft.) 4.6 m (15 ft.) 27.4 m (90 ft.)
316.8 m (55 ft.) 7.6 m (25 ft.) 3.0 m (10 ft.) 25.9 m (85 ft.)
415.2 m (50 ft.) 6.1 m (20 ft.) N/A 24.4 m (80 ft.)
513.7 m (45 ft.) N/A N/A 22.9 m (75 ft.)
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
76 mm (3 in.) 521.3 m (70 ft.)
102 mm (4 in.) 530.5 m (100 ft.)
*For each elbow added, deduct 1.5 m (5 ft.) from max. vent length.
Excludes vent terminators, one termination elbow or rain caps
For details on the vent connection to these models, refer to p. 16.
Horizontal Installaon Diagram Vercal Installaon Diagram
Roof
Flashing
Roof
Fire stop
Wall
Connectbetweenexhaustventcollarandplascpiping.
Seethenextpageforinstrucons.
Hanger
Hanger

16 Page
<How to install plastic venting>
76 mm (3") vent connecon Diagram
From 76 mm (3") to 102 mm (4") vent connecon Diagram
-Exhaust vent (Stainless steel vent)-
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed airtight.
All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed
aluminum adhesive tape having a minimum temperature rating of 71 °C (160 °F). For best results, a vent
system should be as short and straight as possible.
• These models are a Category IV appliance and must be vented accordingly with any 4” vent
approved for use with Category III/IV or Special BH type gas vent.
• The manufacturer recommends the Flexmaster line. However, the following are also UL listed
manufacturers: ProTech Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T Vent).
• Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
• Do not terminate vent into a chimney. If the vent must go through the chimney, the vent must
run all the way through the chimney with Category III / IV approved or Special BH vent pipe.)
• The maximum length of exhaust vent piping must not exceed 30.5 m (100 ft.)(deducting 1.5 m
(5 ft.) for each elbow used in the venting system). Do not use more than 5 elbows.
• When the horizontal vent run exceeds 1.5 m (5 ft.), support the vent run at 0.9 m (3 ft.) intervals
with overhead hangers.
Installaon
Installaon Manual
76 mm (3”)
coupling
Exhaust vent collar
(Female)
76 mm (3”)
plascstraightpipe
76 mm (3”)
coupling
Intake vent collar
(Female)
76 mm (3”)
plascstraightpipe
1. Connect a 76 mm (3") coupling directly on
the exhaust and intake vent collars of the
water heater.
2. Connect a 76 mm (3”) plastic straight pipe
to the coupling.
1. Connect a 76 mm (3") x 102 mm (4")
plastic reducer coupling directly on the
exhaust and intake vent collars of the
water heater.
2. Connect a 102 mm (4”) plastic straight
pipe to the reducer coupling.
102 mm (4”)
plascstraightpipe
76mm (3") x 102 mm (4")
plascreducercoupling
Exhaust vent collar
(Female)
Intake vent collar
(Female)
102 mm (4”)
plascstraightpipe
76mm (3") x 102 mm (4")
plascreducercoupling

17 Page
-Stainless steel Vent Illustraons-
<How to install stainless steel venting>
102 mm (4") vent connecon Diagram
Connect a 102 mm (4") stainless
steel vent straight pipe directly on the
exhaust and intake vent collar of the
water heater.
102 mm (4”) stainless
steel vent straight pipe
Exhaust vent collar
(Female)*
Intake vent collar
(Female)
102 mm (4”)
stainless steel
vent straight
pipe
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
102 mm (4 in.) 530.5 m (100 ft.)
*For each elbow added, deduct 1.5 m (5 ft.) from max. vent length.
No. of Elbows Max. Vertical or Horizontal Vent Length
030.5 m (100 ft.)
129.0 m (95 ft.)
227.4 m (90 ft.)
325.9 m (85 ft.)
424.4 m (80 ft.)
522.9 m (75 ft.)
Excludes vent terminators, one termination elbow, or rain caps.
Installaon
Installaon Manual
• Regarding the clearances from the exhaust terminal to the air inlet or opening, refer to the
next few pages.
• Follow all vent system manufacturer’s instructions and all local codes.
• Do not common vent except with an approved common venting system or connect any vent
from other appliances to these models vent.
• Use 102 mm (4”) Category III/IV approved or Special BH, single or double wall stainless steel
vent pipe.
Hanger
Storm
collar
Vercal Installaon Diagram
Roof
Roof
ashing
Fire stop
Rain cap
Horizontal Installaon Diagram
Wall
Sidewall vent
terminaons
Hanger

18 Page
-Common-venng system-
The Indoor models can be vented together using the same exhaust and intake venting.
• Up to 8 water heaters can be common-vented together.
• A non-return valve (Part No. 9008847005) must be used for each water heater that is part of the system.
• The water heaters must all be direct-vented.
• For common-venting pieces and components, the manufacturer recommends
Centrotherm's vent line.
Typical common-vent installaon examples
• Check with the current version of the Canadian gas code or authority having
jurisdiction to see if common venting is approved in your area.
• Only the models listed in the table above can be common-vented together.
Different models cannot be common-vented.
CAUTION
Allowable models for common-venting
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
For details on the installation of a common-vent system, please refer to the vent manufacturer's
instructions.
Installaon
Installaon Manual
Intake
wall
Exhaust
Roof
Condensate drain port
Non-Return Valve
Exhaust
wall
Roof
Intake
Non-Return Valve
Condensate drain port
Exhaust
Intake
wall
Roof
Non-Return Valve
Condensate drain port

19 Page
To determine the dimension of a common-venng system
Determine the vent diameter (D) and the total vent length based on the number of water
heatersinstalled.Thetotalventlength(L)consistsofthehorizontalwidth(W)andthevercal
height (H). See the table below.
• Total vent length (L)="H"+"W"
• Vent diameter="D"
WARNING
• A Non-Return Valve must be installed for each water heater. This prevents
the escape of combustion gas through non-operating appliances.
• For detailed instructions on the common-venting system, refer to the
instructions that are packaged with the vent parts or web site.
*Diameters of pipes are in accordance with Centrotherm's specifications.
**One elbow is equivalent to 1.5 m (5 ft.) linear length, and the maximum number of elbows is 5.
NOTICE • Regarding the clearances
between the exhaust
termination and the
intaketerminaon,refer
to p. 20 to 22.
• Insert bird screen in
elbow terminals.
Common-venting system
Vent
Diameter*
(D)
Max.
No.of
water
heaters
Max. Vertical and
Horizontal
(Total) Vent Length** (L)
DIP switch settings
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
(Upper bank of DIP switches)
110 mm
(4 in. ) 27.6 m (25 ft.)
No.6 : ON / No.7: OFF No.3 : ON / No.4: OFF
125 mm
(5 in.)
215.2 m (50 ft.)
36.1 m (20 ft.)
160 mm
(6 in.)
230.5 m (100 ft.)
322.9 m (75 ft.)
415.2 m (50 ft.)
57.6 m (25 ft.)
66.1 m (20 ft.)
200 mm
(8 in.)
330.5 m (100 ft.)
430.5 m (100 ft.)
525.9 m (85 ft.)
619.8 m (65 ft.)
715.2 m (50 ft.)
812.5 m (41 ft.)
250 mm
(10 in.)
530.5 m (100 ft.)
630.5 m (100 ft.)
730.5 m (100 ft.)
830.5 m (100 ft.)
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8
Installaon
Installaon Manual
"H"
Intake
Exhaust
"D"
Elbow terminal
Elbow terminal
"W"
Non-Return Valve

20 Page
-Vent terminaon clearances-
Canada U.S.A
Direct-vent and other
than Direct-vent
Direct-
vent
Other than
Direct-vent
AClearance above grade, veranda, porch, deck, or
balcony 1 foot 1 foot 1 foot
B Clearance to window or door that may be opened 3 feet 1 foot
4 feet from below or
side opening. 1 foot
from above opening.
CClearance to permanently closed window * * *
D
Vertical clearance to ventilated soffit located above
the vent terminator within a horizontal distance
of 2 feet (61cm) from the center line of the
terminator
* * *
EClearance to unventilated soffit * * *
FClearance to outside corner * * *
GClearance to inside corner * * *
HClearance to each side of center line extended
above meter/regulator assembly 3 feet * *
IClearance to service regulator vent outlet 3 feet * *
J
Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
application
3 feet 1 foot
4 feet from below or
side opening. 1 foot
from above opening.
KClearance to mechanical air supply inlet 6 feet 3 feet 3 feet
LClearance above paved sidewalk or paved driveway
located on public property 7 feet *7 feet
MClearance under veranda, porch deck, or balcony 1 foot * *
*For clearances not specified in CSA B149.1, please use clearances in accordance with local installation codes and
the requirements of the gas supplier.
Installaon
Installaon Manual
INSIDE CORNER DETAIL
V
Gas meter / regulator
V
V
V
V
V
V
V
V
V
X
X
X
Vent terminal
Air supply inlet
Area where is not permitted
G
A
E
D
B
L
C
F
B
B
B
BA
J
OPERABLE FIXED
CLOSED
B
H
M
K
OPERABLE
FIXED
CLOSED
I