A.O. Smith ATI-110-N, ATI-110-P, ATI-310-N, ATI-310-P, ATI-510-N Installation Manual

On-Demand Water Heater

Installation Manual and Owner’s Guide

	510 (T-D2)
ANSI Z21.10.3 and CSA 4.3	model only

Models

•	110	Indoor (T-KJr2-IN)	•	110	Outdoor (T-KJr2-OS)
•	310	Indoor (T-K4-IN)	•	310	Outdoor (T-K4-OS)
•	510	Indoor (T-D2-IN)	•	510	Outdoor (T-D2-OS)

			If the information in these
			instructions is not followed
			exactly, a fire or explosion may
			resultcausingpropertydamage,
			WARNING personal injury or death.
		-	Do not store or use gasoline or other
			flammable vapors and liquids in the vicinity
			of this or any other appliance.
		- WHAT TO DO IF YOU SMELL GAS
			• Do not try to light any appliance.
			• Do not touch any electric switch, do not
			use any phone in your building.
Gas Tankless Water HeaterTM			• Immediately call your gas supplier from
			a neighbor's phone. Follow the gas
Suitable for potable water heating and space-heating*			supplier's instructions.
* Please refer to local codes for space-heating compliance.			• If you cannot reach your gas supplier, call
			the fire department.
	FEATURING	-	Installation and service must be performed
•	ENDLESS HOT WATER		by a qualified installer, service agency or the
•	ON-DEMAND USAGE		gas supplier.

•COMPACT, SPACE SAVING

•ENERGY CONSERVATION

•COMPUTERIZED SAFETY

	• NO PILOT LIGHT	If you have any questions, please
	• EASY-LINK SYSTEM	call or write to:
	510 (T-D2) model only)
		500 Tennessee Waltz Parkway
		Ashland City, TN 37015
		Toll Free: 1-877-737-2840

Contents

CONTENTS
Installation Manual
SPECIFICATIONS...........................................................................................................................	4
INTRODUCTION...........................................................................................................................	5
SAFETY GUIDELINES....................................................................................................................	6
INSTALLATION..............................................................................................................................	7
General.....................................................................................................................................	7
Warning for installations..........................................................................................................	9
Clearances..............................................................................................................................	10
Included accessories..............................................................................................................	10
Optional items.......................................................................................................................	10
High-altitudeinstallations......................................................................................................	12
Ventinginstructions...............................................................................................................	13
Gas supply and gas pipe sizing...............................................................................................	18
Water connections................................................................................................................	20
Electrical connections............................................................................................................	21
Remote controller connections............................................................................................	22
Pump control connections............................................................................................	23
Easy-Link System....................................................................................................................	24
APPLICATIONS............................................................................................................................	28
INITIAL OPERATION...................................................................................................................	30
Owner's Guide
OPERATING SAFETY...................................................................................................................	32
NORMAL OPERATION................................................................................................................	34
General..................................................................................................................................	34
Temperature settings-with remote controller-.....................................................................	34
Temperature settings on the PCB......................................................................................	38
Flow.......................................................................................................................................	39
Freeze protection system.......................................................................................................	39
Maintenance and service.......................................................................................................	40
Unit draining and filter cleaning............................................................................................	40
TROUBLESHOOTING...................................................................................................................	41
General...................................................................................................................................	41
Error codes............................................................................................................................	43
COMPONENTSDIAGRAM...........................................................................................................	46
PARTS LIST..................................................................................................................................	50
OUTPUT TEMPERATURE CHART....................................................................................................	54
LIMITED WARRANTY..................................................................................................................	55

2 Page

Installation 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 or your local distributor. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater.

3 Page

Installation Manual

Specifications

SPECIFICATIONS

Model

Natural Gas Input

(Operating Range)

Propane Gas Input

(Operating Range)

Gas Connection

Water Connections

Water Pressure*

Natural gas

Inlet Pressure

Propane gas

Inlet Pressure

Manifold

Pressure**

Natural

Propane

Weight

Dimensions

Ignition

	Electric Consumption	Supply
		Operation
		Standby
		Freeze-
		Protection

		110	110	310	310	510	510
		Indoor	Outdoor	Indoor	Outdoor	Indoor	Outdoor
		(T-KJr2-IN) (T-KJr2-OS)		(T-K4-IN) (T-K4-OS) (T-D2-IN) (T-D2-OS)
	BTU/h	Min.: 19,500		Min.: 11,000		Min.: 11,000
		Max.: 140,000		Max.: 190,000		Max.: 199,000
	BTU/h	Min.: 19,500		Min.: 11,000		Min.: 11,000
		Max.: 140,000		Max.: 190,000		Max.: 199,000
				3/4" NPT
				3/4" NPT
	psi			15 - 150*
	" W.C.			Min. 5.0
				Max. 10.5
	" W.C.			Min. 8.0
				Max. 14.0
	" W.C.	2.0	2.5	2.0	2.5	2.0	2.5
	" W.C.	2.5	3.1	3.7	4.0	3.7	4.5
	lbs.		33		38		39
	inch H 20.5 x W 13.8 x D 6.7				H 20.5 x W 13.8 x D 8.5
				Electric Ignition
	VAC / Hz			120 / 60
	W / A	73.1 / 0.61		87.6 / 0.73		89.8 / 0.75
	W / A	6.2 / 0.05		6.2 / 0.05		6.2 / 0.05
	W / A	111 / 0.93		111 / 0.93		111 / 0.93

*The maximum flow may need water pressure equal to or above 40 psi.

** 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.

•In accordance with ANSI Z21.10.3, 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 obligations.

4 Page

Installation Manual

Introduction

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.

•This equipment is an on-demand, tankless water heater designed to efficiently supply endless hot water for your needs.

•The 110 Indoor (T-KJr2-IN), 310 Indoor (T-K4-IN), and 510 Indoor (T-D2-IN) models are only to be installed indoors (direct-vent convertible). The 110 Outdoor (T-KJr2-OS), 310 Outdoor (T-K4-OS), and 510 Outdoor (T-D2-OS) models are only to be installed outdoors.

•The principle behind tankless water heaters is simple:

Exhaust vent collar

Heat exchanger

Flow adjustment valve	Burners
Computer board
		Gas valves
Flow sensor
Thermistor		Fan motor
	Thermistor	Gas inlet
Hot water outlet	Cold water inlet

*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.

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Installation Manual

Safety Guidelines

SAFETY GUIDELINES

SAFETY DEFINITION

Indicates an imminently hazardous situation which, if not avoided, will result in

death or serious injury.

DANGER

Indicates an imminently hazardous situation which, if not avoided, could result

in death or serious injury.

WARNING

Indicates an imminently hazardous situation which, if not avoided, could result CAUTION in minor or moderate injury.

GENERAL

1.Follow all local codes, or in the absence of local codes, follow the most recent edition of the National

FuelGasCode: ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1NaturalGas,PropaneInstallation

Code 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 Canadian Electrical Code Part 1 in Canada.

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.

•Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from scalding. The water temperature is set at 122 °F (50 °C) from the factory to minimize any scalding risk. Before bathing or showering always

			check the water temperature.
	WARNING
		•	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. 20
			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 warranty will not be covered if the heat exchanger is damaged due to freezing. Refer to the section on the Freeze Protection System on p. 39 for more information.

6 Page

Installation Manual

Installation

INSTALLATION

GENERAL

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 the USA or CAN/CSA B149.1 Natural Gas, Propane Installation

Code in Canada.

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. 10 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. 16.)

8.Particles from flour, aerosols, and other 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 dustor debris-free. Regular maintenance is recommended for these types of environment.

9.If you will be installing the water heater in a contaminated area with a high level of dust, sand, flour, aerosols or other contaminants/chemicals, they can become airborne and enter and build up within the fan and burner causing damage to the water heater.

10.For the 110 Indoor (T-KJr2-IN), 310 Indoor (T-K4-IN) and 510 Indoor (T-D2-IN) models:

•These units may be converted to a direct-vent (sealed combustion) appliance by installing a direct-vent conversion kit Part No. 9007667005 (TK-TV10), which will bring in all required

combustible air from outside the building. When installing the direct-vent conversion kit, please follow all instructions included with the kit.

•If the water heater is used as a direct-vent appliance, the unit requires a 3 in. (76 mm)

combustible air supply pipe. The intake pipe must be sealed airtight. Air supply pipe can be made of ABS, PVC, CPVC, Polypropylene, corrugated stainless steel, or Category lll / IV stainless steel.

•Terminating the venting through a sidewall is recommended for the direct-vent system.

•Running the exhaust vent and the intake pipe parallel is recommended.

•Terminating the exhaust and intake on the same wall/surface is recommended. Terminating in the same pressure zone allows for pressure balancing, which prevents nuisance shutdowns.

11.The 110 Outdoor (T-KJr2-OS), 310 Outdoor (T-K4-OS), and 510 Outdoor (T-D2-OS) models are only to be installed outdoors and only in the area with mild, temperate climates.

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Installation Manual

Installation

WARNING

CAUTION

•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.

•If the above conditions cannot be met, use the direct-vent conversion kit Part No. 9007667005 (TK-TV10).

•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.

•The warranty will not cover damage caused by water quality.

•Only potable water or potable water / glycol mixtures 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.

•The manufacturer recommends using the direct-vent kit when the water heater is installed in a beauty salon. Some chemicals used in a beauty salon may affect the flame sensor. Water heater may not work properly.

•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.

8 Page

Installation Manual

Installation

WARNING FOR INSTALLATIONS

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.

Prohibited

Do not install this water heater under an overhang less than 3 ft. from its top or eaves. The area under an overhang must be open to three sides (Outdoor models only).

Prohibited

Do not install the water heater vent terminator within 1 ft. in the USA of any air intake or building opening, and within 3 ft. in Canada of any air intake or building opening (Outdoor models only, refer to p. 16).

3 ft.

(915 mm)

1 ft. (305 mm) USA

3ft.(914mm)Canada

1 ft. (305 mm) USA	1 ft. (305 mm) USA
3ft.(914mm)Canada	3ft.(914mm)Canada

Water heater vent terminator must be at least 2 ft. (610 mm) away from an inside corner for both outdoor installation and direct-vent installation.

2 ft.

(610 mm)

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.

Inside

Corner

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Installation Manual

Installation

CLEARANCES

Top

							Side				Back
		Maintain all		clearances		around	Front				Side
		the water heater.
								Bottom
		Model		Top		Bottom	Front		Back	Sides
	110 Indoor* (T-KJr2-IN)*			12 in.		12 in.	4 in.**		1 in.	3 in.
	310 Indoor* (T-K4-IN)*
				(305 mm)		(305 mm)	(102 mm)		(25 mm)	(76 mm)
	510 Indoor* (T-D2-IN)*
	110 Outdoor (T-KJr2-OS)			36 in.		12 in.	24 in.		1 in.	3 in.
	310 Outdoor (T-K4-OS)
				(914 mm)		(305 mm)	(610 mm)		(25 mm)	(76 mm)
	510 Outdoor (T-D2-OS)
	*Standard indoor installations and direct-vent indoor installations have the same clearances.
	**24 inches recommended for maintenance
			INCLUDED ACCESSORIES
	Check that these items below are included with the water heater.
	1. Installation manual			2. Temperature					3. Communication cable
	and Owner’s guide			remote controller					510 (T-D2) model only
				or			Qty: 1
		Qty: 1									Qty: 1
			TK-RE02			TM-RE30
	Model	110 Indoor	110 Outdoor		310 Indoor		310 Outdoor		510 Indoor		510 Outdoor
		(T-KJr2-IN)	(T-KJr2-OS)			(T-K4-IN)	(T-K4-OS)		(T-D2-IN)		(T-D2-OS)
9007666005
	(TK-RE02)
9007603005
	(TM-RE30)
				OPTIONAL ITEMS
				110		110	310		310	510	510
No.		Model		Indoor		Outdoor	Indoor	Outdoor		Indoor	Outdoor
				(T-KJr2-IN)	(T-KJr2-OS)		(T-K4-IN)	(T-K4-OS) (T-D2-IN) (T-D2-OS)
1		9007996005
	(4” Backflow preventer and F-F adaptor)
2		9007667005
	(Direct-vent conversion kit)
3
	9007670005(Pipe cover)
	9007671005 (Pipe cover)
4	9007674005 (Recess box)
5	9008004005/9008005005
	(Termination & Wall thimble kit)
6	9008147005/9008148005
	(Direct-vent concentric Termination)

10 Page

Installation Manual

Installation

1.4” Backflow preventer and F-F adaptor: 9007996005

2. Direct-vent conversion kit: 9007667005 (TK-TV10)

There are two functions available for this adaptor, which can be connected with the water heater and NovaVent venting line and prevents the backflow of air through the exhaust vent. This helps prevent harmful exhaust gases from entering the home, as well as helping to prevent the unit from freezing in areas where cold air can be blown or drawn into the exhaust system. Install this adaptor in accordance with the installation instructions that are packaged with the adaptor and any applicable codes.

3. Pipe cover: 9007670005 (TK-PC01) and

9007671005 (TK-PCJr2)

The pipe cover protects the plumbing pipes to the water heater from unexpected adjustments. 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.

This kit can be used to convert the water heater from a single vent system to a directvent (double vent) (or sealed combustion) system with a 3 in. (76 mm) intake. Install this conversion kit in accordance with the installation instructions and any applicable codes.

4. Recess box: 9007674005 (TK-RB02)

The recess box will allow for “clean” installations. The water heater fits inside the recess box, which hides and protects the whole water heater and plumbing. The recess box will fit in-between most wall studs.

5. Sidewall vent terminator (Hood) and Wall thimble kit:9008004005 /9008005005

			Covering wall thicknesses	Part#
			Terminator Hood	9007999005
			Wall Thimble 4 - 7 in.	9008345005
			Wall Thimble 5 - 10 in.	9008346005
	Terminator Hood	Wall Thimble	Termination + Thimble 4 - 7 in.	9008004005
			Termination + Thimble 5 - 10 in.	9008005005

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 NovaVent brochure for details.) Install these vent terminations in accordance with their installation instructions and any applicable local codes.

6. Direct-vent concentric termination:

Used when terminating direct-vent (sealed combustion) systems, with indoor models that require a 3 in. (76 mm) intake and a 4 in. (102 mm) 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. This sidewall termination is available in two different sizes, to cover a wide range of wall thicknesses.

For different wall thicknesses, there are two ranges of lengths available. (Refer to the NovaVent

brochure for details.)	Covering wall thicknesses	Part#
	5.0 – 10.0 in. (127 - 254 mm)	9008147005
	12.0 – 18.0 in. (305 - 457 mm)	9008148005

11 Page

Installation Manual

Installation

HIGH-ALTITUDE INSTALLATIONS

Check the elevation where your water heater is installed. Set DIPswitches shown in the table below depending on the altitude.

110 (T-KJr2) and 310 (T-K4) models

	Altitude	0 to 2,000 ft.									2,000 to 4,000 ft.										4,000 to 6,000 ft.
		(DEFAULT)
	Switch No. 3		OFF										ON									OFF
	Switch No. 4		OFF									OFF											ON
		1	2	3		4	5	6	7	8	1	2	3			4	5	6	7	8	1	2	3			4	5	6	7	8
		ON									ON										ON

510 (T-D2) model (Left bank of dipswitches)

	Altitude	0 to 2,000 ft.						2,000 to 4,000 ft. 4,000 to 6,000 ft.
		(DEFAULT)
	Switch No. 4	OFF							ON					OFF
	Switch No. 5	OFF						OFF							ON
		1	2	3	4	5	6	1	2	3	4	5	6	1	2	3	4	5	6
		ON						ON						ON

NOTE: The dark squares indicate the direction the DIPswitches should be set to.

110 (T-KJr2) and 310 (T-K4) models	510 (T-D2) model
Computer board	Computer board

DIPswitches

DIPswitches (Left bank)

Installation altitude

The maximum certified or allowable installed altitude is 6,000 ft. for indoor and outdoor models.

DO NOT adjust any DIPswitches on the upper bank for the 510 (T-D2) WARNING model.

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Installation Manual

Installation

VENTING INSTRUCTIONS

-General-

• 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 DANGER from carbon monoxide and flue gases poisoning. Improper installation will

void product warranty.

		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
	CAUTION	penetrate any combustible or noncombustible construction, be sure to follow all
		applicable national and local codes.

The water heater must be vented in accordance with the section “Venting of Equipment" of the latest edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the United States and/or Section 7 of the

CAN/CSA B149.1 Natural Gas and Propane Installation Code in Canada, as well as applicable local building codes.

The manufacturer recommends the NovaVent line. However, the following are also UL listed manufacturers: ProTech Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T Vent).

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 unit.

•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.

•Avoid using an oversized vent pipe or using extremely long runs of the pipe.

•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 common vent or connect any vent from other appliances to the water heater vent.

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 must be at least 12 in. (305 mm) above grade, but the installer may determine if it should be higher depending on the job site condition and applicable 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 the next few pages.

13 Page

Installation Manual

Installation

-Exhaust venting-

For the 110 Indoor (T-KJr2-IN), 310 Indoor (T-K4-IN), and 510 Indoor (T-D2-IN) models

This is a Category III 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 350 °F (177 °C). For best results, a vent system should be as short and straight as possible.

•This water heater is a Category III appliance and must be vented accordingly with any 4 in. (102

mm)vent approved for use with Category III or Special BH type gas vent.

•Follow the vent pipe manufacturer’s instructions when installing the vent pipe.

•Do not common vent this appliance with any other vented appliance. (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 approved or Special BH vent pipe.)

•When the horizontal vent run exceeds 5 ft. (1.5 m), support the vent run at 3 ft. (0.9 m) intervals with overhead hangers.

•When the vent run exceeds 5 ft. (1.5 m), a condensate drain is recommended. It should be installed as close to the heater as possible.

•The maximum length of exhaust vent piping must not exceed 50 ft. (15.2 m) (deducting 5 ft. (1.5

m)for each elbow used in the venting system). Do not use more than 5 elbows.

Diameter	Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
4 in. (102 mm)	5	50 ft. (15.2 m )
*For each elbow added, deduct 5 ft. (1.5m) from max. vent length.
No. of Elbows		Max. Vertical or Horizontal Vent Length
0		50 ft. (15.2 m)
1		45 ft. (13.7 m)
2		40 ft. (12.2 m)
3		35 ft. (10.7 m)
4		30 ft. (9.1 m)
5		25 ft. (7.6 m)

Excludes elbow termination, rain caps, or the 4 in. (102 mm) Concentric termination

14 Page

Installation Manual

Installation

Venting Illustrations-

For the 110 Indoor (T-KJr2-IN), 310 Indoor (T-K4-IN), and 510 Indoor (T-D2-IN) models

For details of the optional items, refer to the Installation manual for each Optional item.

Horizontal Installation	Vertical Installation
		Rain cap
Wall		Roof flashing
	Roof
Hanger
Backflow
preventer*
		Fire stop
Sidewall vent
termination
	Backflow
Vertical condensation drain**	preventer*
		Vertical condensation drain**

	Horizontal Installation	Vertical Installation
	(With direct-venting)	(With direct-venting)
	Wall		Rain cap
	Hanger	Roof
			Roof flashing
	Hanger
	Sidewall vent
	termination
Backflow	Vertical condensation	Backflow
preventer*	drain**	preventer*	Fire stop
	See the picture below for detailed connection		Vertical condensation drain**
	instructions to Direct-vent conversion kit.

*Backflow preventer (Recommended for freezing weather conditions: 36 °F (2 °C) and below). **Vertical condensation drain must be installed in accordance with local codes.

Horizontal Installation with	Installation of Direct-vent conversion kit
Direct-vent concentric termination	(TK-TV10) with a water heater
Wall	Air intake cover plate	Remove the air intake
		cover plate to attach
		the air intake port from
		the Direct-vent
		conversion kit (TK-TV10)
		into there.

Direct-vent concentric termination

Cover the louver of the

water heater with the plate

provided in the Direct-vent

conversion kit to complete

the conversion to sealed combustion.

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Installation Manual

Installation

-Vent termination clearances-

D

E V

B

V

L

INSIDE CORNER DETAIL
	V	Vent terminal
	X	Air supply inlet
V	G	Area where is not permitted

H

A

B

B

V

C

FIXED

M

X

V

OPERABLE CLOSED

I

V

X

V

FIXED

B

V

K

CLOSED

J

F V

OPERABLE

B

A

Gas meter / regulator

B

			Canada		U.S.A
			Direct-vent and other	Direct-	Other than
			than Direct-vent	vent	Direct-vent
	A	Clearance above grade, veranda, porch, deck, or	1 foot	1 foot	1 foot
		balcony
					4 feet from below or
	B	Clearance to window or door that may be opened	3 feet	1 foot	side opening. 1 foot
					from above opening.
	C	Clearance to permanently closed window	*	*	*
		Vertical clearance to ventilated soffit located above
	D	the vent terminator within a horizontal distance	*	*	*
		of 2 feet (61cm) from the center line of the
		terminator
	E	Clearance to unventilated soffit	*	*	*
	F	Clearance to outside corner	*	*	*
	G	Clearance to inside corner	*	*	*
	H	Clearance to each side of center line extended	3 feet	*	*
		above meter/regulator assembly
	I	Clearance to service regulator vent outlet	3 feet	*	*
		Clearance to non-mechanical air supply inlet to			4 feet from below or
	J	building or the combustion air inlet to any other	3 feet	1 foot	side opening. 1 foot
		application			from above opening.
	K	Clearance to mechanical air supply inlet.	6 feet	3 feet	3 feet
	L	Clearance above paved sidewalk or paved driveway	7 feet	*	7 feet
		located on public property
	M	Clearance under veranda, porch deck, or balcony	1 foot	*	*

*For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA-B149.1, please use clearances in accordance with local installation codes and the requirements of the gas supplier.

16 Page

Installation Manual

Installation

-For sidewall terminations-

		2 ft.
	1 ft. (305 mm) (610 mm) min.
	min.
	1 ft.
	(305 mm) min.
	Exhaust	Inside
	termination	corner
		2 ft.
	1 ft. (305 mm)	(610 mm) min.
	min.
	1 ft.
	(305 mm) min.
	Combined
	intake and	Inside
	exhaust
		corner
	termination

For multiple sidewall exhaust terminations (e.g. multiunit systems), an exhaust termination must be at least 1 ft. (305mm) away from another exhaust termination. An exhaust termination must also be at least 2 ft. (610 mm) away from an inside corner. (If the adjacent wall is less than 2 ft. (610 mm) of length, the minimum required distance away from the inside corner will be equal to the length of that adjacent wall.)

For multiple-unit, direct-vent sidewall terminations that combine the intake and exhaust into a single penetration, space each direct-vent termination at least 1 ft. (305 mm) away from each other, no matter the orientation. A directvent termination must also be at least 2 ft. (610 mm) away from an inside corner. (If the adjacent wall is less than 2 ft. (610 mm) of length, the minimum required distance away from the inside corner will be equal to the length of that adjacent wall.)

Exhaust termination

3 ft. (915 mm) min.

3 ft. 3 ft. (915 mm)

(915 min.

mm) min.

Air supply inlet

For direct-vent sidewall terminations that use two separate penetrations for the intake and exhaust, distance the intake and exhaust terminations at least 3 ft. (915 mm) away from each other, no matter the orientation.

Exhaust and/or direct-vent sidewall terminations should be at least 2 ft. (610 mm) away from an opposite surface/ wall. Do not place the termination directly in front of an opening into a building.

Exhaust 2 ft. (610 mm) termination

min.

A	-For rooftop terminations-
A	2ft.
A	(610 mm) min.
	A

A

Air intake

Exhaust termination

A: In accordance with local codes

Exhaust termination

Air intake

For multiple-unit rooftop terminations (whether for standard or direct-vent installations) space all exhaust and intake terminations in accordance with local codes. An exhaust termination must be spaced from a wall or surface in accordance with local codes as well. In the absence of such a code, an exhaust termination must be a horizontal distance of at least 2 ft. (610 mm) away from a wall or surface.

Please follow all local and national codes in regards to proper termination clearances. In the absence of such codes, the above clearances can be used as

CAUTION guidelines. Local codes supersede these guidelines.

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