John Wood CT-199 indoor User manual

Gas Tankless Water HeaterTM
Suitable for combination potable water heating and
space heating. Please refer to local codes for space-
heating compliance.
Commercial Condensing Tankless Water Heater
Installation Manual and Owner’s Guide
If you have any questions, please
call or write to:
In the United States
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
In Canada
599 Hill Street West
Fergus, ON N1M 2X1
1-888-479-8324
- 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.
WARNING
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death.
ANSI Z21.10.3・CSA 4.3
R
DR
Keep this manual near the water heater for future reference whenever maintenance, adjustment, or
service is required.
FEATURING
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
• Complies with SCAQMD Rule
1146.2 for natural gas Low NOx
Emissions of 14 ng/J or 20 ppm.
• EASY-LINK SYSTEM
• MULTI-UNIT SYSTEM
Models
CT-199 Indoor CT-199 Outdoor
(USA only)

2Page
Contents
CONTENTS
Installation Manual
SPECIFICATIONS .............................................4
INTRODUCTION ..........................................5
SAFETY GUIDELINES.....................................6
SAFETY DEFINITION....................................6
GENERAL......................................................6
INSTALLATION ................................................7
GENERAL......................................................7
CLEARANCES ...............................................9
INCLUDED ACCESSORIES............................9
OPTIONAL ITEMS........................................9
WARNING FOR INSTALLATIONS...............11
 .............12
VENTING INSTRUCTIONS.........................13
Vent termination clearances ....................14
Clearances for sidewall terminations .......15
Clearances for rooftop terminations ........16
Combustion air supply..............................17
Exhaust vent (ABS,PVC,CPVC, or
polypropylene vent) .................................21
DIP switch settings for vent length
(ABS,PVC,CPVC, or polypropylene vent)...22
Exhaust vent (Stainless steel vent) ...........25
DIP switch settings for vent length
(Stainless steel vent).................................25
Common venting system ..........................27
GAS SUPPLY AND GAS PIPE SIZING.........29
General .....................................................29
Gas connections .......................................29
Natural Gas supply piping.........................30
Propane (LP) supply piping.......................30
WATER CONNECTIONS .............................31
Pressure relief valve .................................31
CONDENSATE DRAIN ................................32
ELECTRICAL CONNECTIONS.....................34
TEMPERATURE REMOTE CONTROLLER .....35
Included accessories.................................35
Installation ................................................35
 .........................................37
Easy link connection procedures ..............37
......................................39
APPLICATIONS..............................................40
Recirculation.............................................40
Domestic and space heating ....................41
Dual-Purpose Water Heating
of the State of Massachusetts..................43
INITIAL OPERATION .....................................44
Owner's Guide
OPERATING SAFETY .....................................46
NORMAL OPERATION ..................................48

AND REMOTE CONTROLLER ..................48
GENERAL....................................................48
OUTLET WATER TEMPERATURE
SETTING.....................................................49
TEMPERATURE TABLE OF CONTROLLER.49
ADDITIONAL FEATURES............................50
Information mode ....................................50
Unit conversion mode ..............................50
TEMPERATURE SETTINGS ON THE PCB ........51
FREEZE PROTECTION SYSTEM ................. 51
FLOW .......................................................... 52
MAINTENANCE AND SERVICE .................. 52
MEASURING INLET GAS PRESSURE ..............52
INLET WATER FILTER CLEANING ................... 53
UNIT DRAINING & POWER OUTAGE............. 53
TROUBLESHOOTING.....................................54
GENERAL....................................................54
ERROR CODES ...........................................55
General .......................................................55
Single unit installation ..............................56
Easy-Link System.......................................56
Fault analysis error code ..........................57
COMPONENTS DIAGRAM ............................59
PARTS LIST....................................................63
OUTPUT TEMPERATURE CHART ..................64

3Page
Installaon Manual
Installation ManualInstallation Manual
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater.
Before use, we recommend that you read through this installation

If you need an additional manual, contact the manufacturer or your
local distributor. You may also download a manual from our website.
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.

4Page
Specicaons
Installaon Manual
SPECIFICATIONS
*40 psi or above is recommended for maximum flow.
**Water heater Category — water heaters of other than direct vent type, for outdoor installation, are divided into four
categories based on static pressure produced in the vent and flue loss.
Category IV - a water heater that operates with a positive vent static pressure and with a vent gas temperature that
may cause excessive condensate production in the vent.
NOTE:
• Check the rating plate to ensure that this product matches your specifications.
• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligation.
Model CT-199 Indoor
(AT-H3C-DV)
CT-199 Outdoor
(AT-H3C-OS)
Natural Gas Input
(Operating Range) BTU/h Min.: 15,000 Max.: 199,000
Propane Input
(Operating Range) BTU/h Min.: 13,000
Max.: 199,000
Gas Connection 3/4" NPT
Water Connections 3/4" NPT
Water Pressure* psi (MPa) 15 - 150 (0.1 - 1)
Natural gas
Inlet Pressure
" W.C.
(kPa)
Min. 4.0 (1.00)
Max. 10.5 (2.61)
Propane
Inlet Pressure
" W.C.
(kPa)
Min. 8.0 (1.99)
Max. 13.0 (3.23)
Weight lbs. (kg) 59 (26.8) 59 (26.9)
Dimensions inch H 22.4 x W 17.7 x D 10.7
H 570 x W 450 x D 272
mm
Ignition Electric Ignition
Electric
Supply VAC/Hz 120/60
Consumption
Operation W/A 89.0 / 0.74
Standby W/A 4.2 / 0.04
Freeze-
Protection W/A 175 / 1.5
Water heater category** Category
IV N/A

5Page
Introducon
Installaon Manual
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 when properly sized and installed.
• These high efficiency models have a built-in secondary heat exchanger that absorbs latent
heat from the exhaust gas.
• The CT-199 Indoor model is only to be installed indoors. The CT-199 Outdoor model is only
to be installed outdoors.
• The principle behind tankless water heaters is simple:
Exhaust
Secondary
heat exchanger
Intake port
Condensate
drain port
Cold water inlet
Gas
Hot water outlet
Computer board
Fan motor
Gas valves
Igniter
Thermistor
Thermistor
Bypass valve
Primary
heat exchanger
Exhaust thermistor
Water control valve
Thermistor
Flow sensor
Burners
1
2
3
4
5
4
6
7
7
7
8
4
4
7
*This diagram illustrates tankless water heater design concepts only and does not accurately
represent the water heater’s physical description.
1. A hot water fixture is turned on.
2. Water flows through the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and gas valve to let gas flow through the heater 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 is heated as it flows through the heat exchanger.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates
the gas and water valves to ensure proper output water temperature and hot water outflows.
8. When the fixture is turned off, the unit shuts down.

6Page
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel
Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation 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 combustion 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, the gas company, or the manufacturer.
Safety Guidelines
Installaon Manual
SAFETY GUIDELINES
SAFETY DEFINITION
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.
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
DANGER
Indicates information considered important but not hazard related.
NOTICE
WARNING
• Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from
scalding. The water temperature is set at 120 °F (50 °C) from the factory to minimize any
scalding risk. Before bathing or showering always check the water temperature.
• Temperature limiting devices such as mixing valves must be installed when required by
codes and to ensure safe temperatures at fixtures.
• 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 page 31 when installing your
water heater.
• Should overheating occur or the gas supply fails to shut off, turn off the manual gas
control valve to the appliance.
• Do not use this appliance if any part has been in contact with or been immersed in water.
Immediately call a qualified installer or service agency to replace a flooded water heater.
Do not attempt to repair the unit. It must be replaced.
• Do not disconnect the electrical supply if the ambient temperature will drop below
freezing unless the water has been drained from the water heater. 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 page 51 and Unit draining & power outage (Freeze protection) on page 53 for
more information.
• Failure to observe these warnings could result in severe personal injury or death.

7Page
Installaon
Installaon Manual
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel
Gas Code: ANSI Z223.1/NFPA 54 in the USA or 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 page 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustion air will
be available to it at all times without obstructions, or the indoor heater must be direct vented.
See pages 13 to 26.
6. Install the water heater so it is level (left-to-right & front-to-back) and plumb (vertically).
7. Electrical service to the water heater requires a means of disconnection. This will allow power to
the water heater to be shut off for servicing and safety purposes.
8. 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
clearance from any doorway or opening to prevent exhaust from entering a building. (Refer to
pages 8, 11, 14 and 15.) Check local code requirements prior to installation.
9. Carefully plan the installation location of the heater and vent terminations. Contaminants
such as aerosols, lint, and fine powders (including flour) can clog the air intake and reduce the
operation of the fan. This, in turn, can cause improper combustion and reduce the life of the
water heater. Regularly ensure that the area around the water heater, vent termination, and
air intake are free of dust, debris, and other contaminants. In environments with a high level of
contaminants (laundry facilities, hair salons, pet salons, chemical plants, commercial kitchens,
etc.), direct venting is required.
10. The Indoor 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 ABS, PVC, CPVC, or polypropylene
(Plastic) venting if ABS, PVC, CPVC, or polypropylene is used. If the exhaust gas temperature
exceeds 140 °F (60 °C), these components will enable the unit to safely stop operations. These
components are not installed on the outdoor models since the exhaust vent is built-in.
• If the water heater is used as a direct-vent appliance, the unit requires 3or 4combustion air
supply pipe. The intake pipe must be sealed airtight. Refer to pages 13 to 26 for more detail.
• 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.
• Only install the water heater in a heated area where below freezing temperatures cannot
occur. The warranty does not cover damage caused by freezing.
• The water heater must be securely mounted to a wall or other suitable structure.
• The venting system shall be installed in accordance with the water heater manufacturer's and
venting system manufacturer's instructions.
11. The Outdoor models must only be installed outdoors and only in an area with mild, temperate
climates. The Outdoor model shall be wall-mounted or mounted on a stand. Locate the Outdoor
model in an open, unroofed area and maintain the following minimum clearances: There is a 3 in
(76 mm) clearance from the left and right sides of the unit to combustible and non-combustible
surfaces.

8Page
Installaon
Installaon Manual
WARNING
NOTICE
• 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 4 grains per gallon (70 ppm) for
commercial 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.
• The manufacturer recommends direct venting when the water heater is installed
in beauty salons, dry cleaners or any other locations in which such chemicals are
present in the air. Some chemicals used in beauty salons or dry cleaners may affect
the flame sensor. In such cases, the 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 water 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. A drain pan, or other means of
protection against water damage, is recommended to be installed under the water
heater in case of leaks. In addition, you may install an active water leak detector
with a shutoff valve which can turn off the water supply in the event of a leak. The
manufacturer is not responsible for damage due to water leaks. If you install a drain
pan under the unit, ensure that it will not restrict the combustion air flow.
• 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 attach the gas line to the water heater until after the gas line system pressure test
for leaks has been completed. See page 29 for additional information.
• Do not install or locate the vent terminal pointing toward any operating window, door,
opening into a building or other area where people gather, where combustion gases could
create a nuisance or hazard or cause property damage.
• Do not install the air intake 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.
• Do not install the unit where water, debris, or flammable vapors may get into the flue
terminal or the air intake line.
• 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. Failure to do
so could lead to carbon monoxide poisoning or death.
- 
and pressure sensor, the water heater will shut down on an error code.
- Place the unit where it will allow easy access for service and maintenance.
- A drain pan, or other means of protection against water damage, is recommended to be
installed under the water heater in case of leaks. See the NOTICE below.
• The water heater must be securely mounted to a wall or other suitable structure so that
it is level (left-to-right & front-to-back) and plumb (vertically).
• Failure to observe these warnings could result in severe personal injury, death, and/or
property damage.

9Page
CLEARANCES
Installaon
Installaon Manual
Model Top Bottom Front Back Sides
CT-199 Indoor 12 in
(305 mm)
12 in
(305 mm)
4 in*
(102 mm)
0.5 in
(13 mm)
3 in
(76 mm)
CT-199 Outdoor 36 in
(914 mm)
12 in
(305 mm)
24 in
(610 mm)
0.5 in
(13 mm)
3 in
(76 mm)
*24 inches (610 mm) recommended for maintenance.
OPTIONAL ITEMS
Back
Side
Front
Side
Top

#Model CT-199 Indoor CT-199 Outdoor
1. Temperature remote
controller ✓
2. Pipe cover ✓ ✓
3. Neutralizer kit ✓ ✓
4. 3" PVC concentric
termination ✓
5. Recess box ✓
6. Non-return valve ✓
7. 4" PVC Adapter
(for non-return valve) ✓
Maintain all clearances around the water
heater. Failure to do so could create a fire
hazard, potentially leading to death, serious
injury, and/or property damage.
WARNING
INCLUDED ACCESSORIES
Check that these items below are included with the water heater.
Installation manual
and owner’s guide
Temperature remote controller kit
Outdoor models only
(Refer to pp. 10 and 35.)
Bird screen
Indoor models only Communication cable
Qty: 1 Qty: 1Qty: 1 Qty: 2
100112572 (TM-RE40) 100282480 100076516

10 Page
Installaon
Installaon Manual
3. Neutralizer kit: 100112159
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 pp. 32 and 33.)
1. Temperature remote controller:
100112572 (TM-RE40)
The temperature remote controllers have
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. See the
Troubleshooting Section (pp. 54 to 58) for information
on possible error codes.
4. 3" PVC concentric termination: 100112163
Used when terminating direct-vent (sealed combustion)
systems, with Indoor models that require a 3 in intake and a 3
in exhaust.
2. Pipe cover:
100112718 (TH-PC03)
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.
6. Non-return valve: 100113130
7. 4" PVC Adapter: 100113129
It is a must-have item for common venting system. It prevents
the escape of combustion gas through non-operating appliances.
(Refer to pp. 27 and 28.)
This adapter transitions from the Non-return valve
outlet to 4" schedule 40 PVC pipe.
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.
5. Recess box:
It allows for “clean” installations for Outdoor installation. The water heater fits inside the recess box,
which hides and protects the whole water heater and plumbing. The recess box will fit between most
wall studs. For retrofit applications - no flange For new construction applications - with flange
100306285
100298009

11 Page
Installaon
Installaon Manual
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.
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.
Prohibited Prohibited
Ensure that you meet the minimum clearances
shown below for a direct vent termination:
Ensure that you meet the minimum clearances
shown below for Outdoor vent termination:
Locate the outdoor water heater so it's vent termi-
nal meets the following clearances. Locate the vent
terminal of an indoor heater to meet the following
clearances:



4 � min.
4 � min.
4 � min.

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



Outside
corner Inside
corner

(61 cm)

(91 cm)

(61 cm)

12 Page
HIGH-ALTITUDE INSTALLATIONS
WARNING
• Adjust the appropriate DIP switches according to model and elevation as
shown below. DO NOT adjust the other DIP switches.
• Turn off the power supply to the water heater before changing the DIP
switch settings.
• Failure to observe these warnings could lead to carbon monoxide poisoning
or death.
Check the elevation where your water heater is installed. Set DIP switches shown in the table below
depending on the altitude.
Installaon
Installaon Manual
Lower bank of DIP switches
Indoor model
0 to 2,000 ft
(0 to 610 m)
(DEFAULT)
2,001 to
3,000 ft
(611 to 914 m)
3,001 to
5,000 ft
(915 to 1,524 m)
5,001 to
7,500 ft
(1,525 to 2,286 m
7,501 to
10,100 ft
(2,287 to 3,078 m)
CT-199
(Lower bank of
DIP switches)
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : ON
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : ON
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : ON
No. 3 : ON
No. 4 : ON
Altitude
DIP switches
Installation altitude
The maximum certified or allowable installed altitude is
10,100 ft (3,078 m) for indoor model and 6,000 ft (1,829
m) for outdoor model.
NOTE: The dark squares indicate the correct DIP switch positions.
Outdoor model
0 to 2,000 ft
(0 to 610 m)
(DEFAULT)
2,001 to
4,000 ft
(611 to 1,219 m)
4,001 to
6,000 ft
(1,220 to 1,829 m)
CT-199
(Lower bank of
DIP switches)
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
OFF
ON
1 2 3 4 5 6
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
OFF
ON
1 2 3 4 5 6
No. 2 : ON
No. 3 : OFF
No. 4 : ON
Altitude
DIP switches

13 Page
Installaon
Installaon Manual
VENTING INSTRUCTIONS
• 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.
• 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.
WARNING
The Indoor model must be vented in accordance with "Venting of Equipment" in the current edition of the
National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the United States and/or Section 8 of the B149.1 Natural
Gas and Propane Installation Code in Canada, as well as applicable local building codes.
The use of venting materials approved for Category III/IV appliances is recommended whenever possible.
However, the Indoor model may also be vented with plastic pipe materials such as ABS, PVC (solid core),
CPVC (solid core), or polypropylene. For details, please refer to the Exhaust Vent (ABS, PVC, CPVC, or
Polypropylene Vent) Section on page 21. Vent installations in Canada which utilize plastic vent systems must
use venting that complies with ULC S636.
General rules for venting water heaters:
• 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 or alter 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 except an
approved common-venting system. Refer to pages 27 and 28.
• Avoid using an oversized vent pipe or using extremely long runs of the pipe unless it is part of an
approved common vent system.
• Air supply pipe can be made of ABS, PVC (solid core), CPVC (solid core), polypropylene, corrugated
stainless steel, or Category lll/IV stainless steel. Regarding exhaust pipe, refer to pages 21 to 26.
• Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in nonmetallic
venting systems is prohibited. Covering non-metallic vent pipe and fittings with thermal insulation is
prohibited.
• Sidewall venting is recommended for the Indoor model. Vertical venting (roof termination) is acceptable.
• Slope horizontal venting sections 1/4" upwards for every 12" (300 mm) toward the termination or
according to local and state codes, or in the absence of local or state codes, the current edition of the
National Fuel Gas Code, ANSI Z223.1 (NFPA 54).
• The manufacturer recommends running the exhaust vent and the intake pipe as parallel as possible.
• 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.
• The water heater shall not be connected to a chimney flue serving a separate appliance, designed to
burn solid fuel.
• When an existing Category I appliance is removed or replaced, the original venting system may no longer
be sized to properly vent the attached water heater. An improperly sized venting system may cause
formation of condensate, leakage, and spillage and so on.
General rules for venting water heaters:
• 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 12 in (305 mm) above grade and anticipated snow level, 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 pages 11,
14 to 16.

14 Page
Installaon
Installaon Manual
D
L
B
V
V
V
V
V
V
FJ
BB
C
B
B
B
B
A
K
MX
X
B
15 �
I
E
H
Inside
corner detail
V
G
A
Fixed
closed
Fixed
closed
Operable
Operable
Regulator vent outlet
In the event no regulator is present,
H and I can be disregarded
Legend:
V
X
= Vent terminal
= Air supply inlet
= Area where terminal is not permi�ed
Canada Installations1US Installations2
Direct vent and
other than direct vent Direct vent Other than direct vent
AClearance above grade, veranda, porch, deck, or balcony 1 ft (30 cm) 1 ft (30 cm)
B Clearance to window or door that may be opened 3 ft (91 cm) 1 ft
(30 cm)
4 ft (1.2 m) below or to side of
opening;
1 ft (30 cm) above opening
CClearance to permanently closed window 0 0 0
D
Vertical clearance to ventilated soffit located above
the terminal within a horizontal distance of 2 ft (61
cm) from the center line of the terminal
3 ft (91 cm) 3 ft (91 cm) 3 ft (91 cm)
EClearance to unventilated soffit 3 ft (91 cm) 3 ft (91 cm) 3 ft (91 cm)
FClearance to outside corner 2 ft (61 cm) 2 ft (61 cm) 2 ft (61 cm)
GClearance to inside corner 2 ft (61 cm) 2 ft (61 cm) 2 ft (61 cm)
HClearance to each side of center line extended above
meter/regulator assembly
3 ft (91 cm) within
a height of 15ft(4.6m) * *
IClearance to service regulator vent outlet 3 ft (91 cm) * *
J
Clearance to non-mechanical air supply inlet to
a building or the combustion air inlet to any other
appliance.
3 ft (91 cm) 1 ft
(30 cm)
4 ft (1.2 m) below or to side of
opening;
1 ft (30 cm) above opening
Clearance to mechanical air supply inlet 6 ft (183 cm) 3 ft (91 cm) above if within
10 ft (3 m) horizontally.
LClearance above paved sidewalk or paved driveway
located on public property 7 ft (213 cm)** 7 ft (213 cm) 7 ft (213 cm)
MClearance under veranda, porch deck, or balcony 1 ft (30 cm)*** 1 ft
(30 cm)*** 1 ft (30 cm)***
*Clearance in accordance with local installation codes and the requirements of the gas supplier.
**A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves
both dwellings.
***Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
The vent for condensing water heaters shall not terminate:
• over public walkways; or
• near soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property damage; or
• where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other
equipment.
Notes:
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
2) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
3) If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
4) Blocking air supply and exhaust vent by snow may cause incomplete combustion and an appliance failure. Install the termination by
providing sufficient clearance from anticipated snow line in accordance with local code or manufacture's instructions and make sure
there in no blockage.
5) Provide an appropriate clearance between a vent termination and a building to prevent degradation to building materials caused by
flue gases.
6) Water heaters installed outdoors follow the Other Than Direct Vent clearances.
-Vent termination clearances-

15 Page
Installaon
Installaon Manual
-Clearances for sidewall terminaons-
Multiple Sidewall Terminations
An exhaust termination must be at least
1 ft (305 mm) 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.)
Multiple DV Sidewall Terminations
A direct vent (DV) termination must be
at least 1 ft (305 mm) away from other
direct vent terminations.
A direct vent 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.)
Ancipated Snow level
Exhaust
Terminaon
2 
(610 mm)
min.
1 
(305 mm)
min.
1 
(305 mm)
min.
Inside
corner
Inside
corner
Ancipated Snow level
2 
(610mm)
min.
1 
(305 mm)
min.
1 
(305 mm)
min.
Combined
intake and
exhaust
terminaon
For direct vent sidewall
terminations that use two
separate penetrations for
the intake and exhaust,
keep the termination
clearances shown in the
diagrams on the right.
Improper installation can result in carbon monoxide poisoning or death. Follow all local
and national codes in regards to proper termination clearances. In the absence of such
codes, the clearances below can be used as guidelines. Local codes supersede these
guidelines.
WARNING
1 ft (305 mm) min.
0.5 ft
(159 mm) min.
Exhaust
Intake
Exhaust
Intake
<Case 2>
1 ft (305 mm)
min.
0.5 ft
(159 mm) min.
0.5 ft
(159 mm)
min.
Exhaust
Intake
Exhaust
Intake
<Case 1>
Exhaust
termination
2 ft (610 mm)
min.
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.

16 Page
Installaon Manual
Installaon
-Clearances for rooop terminaons-
Follow all local and national codes in regards to proper termination clearances. In the absence
of such codes, the clearances below must be met. Local codes supersede these clearances.
Failure to observe this warning may result in severe personal injury or death.
WARNING
Canadian requirements differ from the guidelines in this section. In Canada, follow
the requirements of B149.1 (Natural Gas and Propane Installation Code, current
edition) as well as local and provincial codes. Contact your local code enforcement
agency for direction.
NOTICE
• Exhaust terminations must be at least 1 ft (305 mm) away from any obstructions.
• Minimum spacing between multiple terminals:
intake terminals: 1 ft (305 mm) spacing between each
exhaust terminals: 1 ft (305 mm) spacing between each
• The exhaust termination must be a horizontal distance of at least 2 ft (610 mm) from a
wall or surface unless specified differently by local code.
• Failure to observe this warning may result in severe personal injury or death.
WARNING
Angled roof termination
Ancipated snow level
2  (610 mm) min.
1 
(305 mm)
min.
1 
(305 mm)
min.
1 
(305 mm)
min.
Exhaust
Intake
Multiple flat roof terminations













Exhaust Exhaust
Intake
Intake
Flat roof termination
Ancipated snow level
3  (914 mm) min.
1 
(305 mm)
min.
1 
(305 mm)
min.
Exhaust
Intake
Multiple angled roof terminations
1 
(305 mm)
min.
1 
(305 mm)
min.
3 
(914 mm)
min.
1 
(305 mm)
min.
1 
(305 mm)
min.
Ancipated snow level
2 
(610 mm)
min.
1 
(305 mm)
min.
Exhaust Exhaust
Intake
Intake

17 Page
-Combuson air supply-
This gas water heater requires an adequate source of clean air for combustion and
ventilation. Without sufficient air, your water heater may not operate properly and
may emit excessive and abnormal amounts of carbon monoxide which may result in
carbon monoxide poisoning or death.
WARNING
• The guidelines in this section apply to installations within the United States. All
U.S. installations must conform to the National Fuel Gas Code, ANSI Z223.1/NFPA
54 (current edition) and local codes.
• Canadian requirements differ from the guidelines in this section. In Canada,
follow the requirements of B149.1 (Natural Gas and Propane Installation Code,
current edition) as well as local and provincial codes. Contact your local code
enforcement agency for direction.
NOTICE
Before installing the water heater, you must determine the amount of air needed to supply this water
-

Check for Chemicals:


these corrosive chemicals is not covered by the warranty.
WARNING!
In all cases, ensure that corrosive chemicals are not present at the air intake. Presence of such chemicals

require outside air due to chemicals include:
• Beauty salons
• Photo processing labs
• Indoor pools
• 
• Chemical storage areas
• Restaurants
Products such as aerosol sprays, detergents, bleaches, cleaning solvents, gasoline, air fresheners, paint and
varnish removers, and refrigerants should not be stored or used near the water heater.
Does your installation space have sufficient combustion air?









-
ing appliances (e.g., water heaters, furnaces, clothes dryers) in the same area. Do not include appliances
that are direct vented. Refer to the following example.
Installaon
Installaon Manual

18 Page
Your water heater’s BTU/h rating is on the rating plate. The BTU/h ratings should be on the other
appliances’ rating plates. If you have trouble determining the BTU/h ratings, contact the manufacturer
or have a qualified person determine the ventilation requirements.
NOTICE:

Gas Burning Appliance 
Gas Water Heater 199,000
Furnace 75,000
Dryer 20,000
Total 294,000
Example: Gas Burning Appliance 
Gas Water Heater
Total
Your
appliances:
Calculate the air volume of the room
Air requirements depend on the size of the room.
32
If there are large objects in the room (e.g., refrigerator, furnace, car), subtract their volume from the vol-

Air Volume = Room Volume - Object Volume

Calculate required air volume
3
(1.42 m3) per 1,000 BTU/h of the total input for all gas burning appliances in the same area.
33/ 1000 (btu/h)
Example:
3
If the air volume of the room is less than the required air volume, you must direct vent the water heater
-

If the air volume of the room is greater than the required air volume, it may be possible to install the


as furnaces, whole house fans, and clothes dryers draw air out of your home. If they draw air out faster



-
”
Install with outside ventilation


Supplying outside air to the water heater typically requires two openings. One opening must be within 12 in

single opening is not preferred, you may use a single opening to outside air if the minimum free area is sized
according to Table 1


Installaon
Installaon Manual

19 Page
Determine type of ventilation


1. Direct to outdoors
2. 
3. Horizontal ducts
4. Single opening (not recommended; must be at least 100 in2(645 cm2-
3(1.42 m3
5. From a larger room inside the house (not recommended – refer to "Calculate the air volume of the room"
above to determine if the combined volume of the rooms may be adequate).
Determine minimum free area required for each vent opening

from “Before beginning”) and the type of vent used. Table 1 provides the minimum free area for each vent opening

Calculate minimum size of vent openings and ducts

vents use louvers or grilles to protect the opening. The louver or grill itself blocks some of the free area, so the open-
ing may need to be larger to meet the minimum free area requirements.


2(645 cm2) of free area would need
134 in2(865 cm222).

• 
• 

• Each vent opening must be no smaller than 100 in2(645 cm2).
• 
• Rectangular ducts must have a minimum dimension of no less than 3 in (76 mm).
• All screens must have mesh ¼” or larger.
• -

• 
Check that air source is clean and free of chemicals
-


See graphics on next page.
Table 1

indoor spaces.

Opening Source Minimum Free Area
Direct to outdoors* 1 in2(6.5 cm2) per 4,000 BTU/hr (see Figure 1, 2)
 1 in2(6.5 cm2) per 4,000 BTU/hr (see Figure 3)
Horizontal ducts 1 in2(6.5 cm2) per 2,000 BTU/hr (see Figure 4)
Single Opening 1 in2(6.5 cm2) per 3,000 BTU/hr (see Figure 5)
Two permanent openings
to another room**
1 in2(6.5 cm2) per 1,000 Btu/hr (see Figure 6)
Opening: 100 in2 (645 cm2) MIn
Minimum dimension of air openings:
no less than 3 in (76 mm)

an outside wall.
-


Installaon
Installaon Manual

20 Page

Installaon
Installaon Manual
Gable vent
to outdoors
Install above
insulaon
Outlet air to
ac 1 in2 (6.5 cm2)
per 4,000 btu/h
Inlet air from
the crawl space
Open foundaon vent
Confined
Space
Alternate
Air Inlet
1 in2 (6.5 cm2)
per 4,000 btu/h
Figure 1 - Direct to outdoors openings
Figure 3 - Vertical duct openings
Outlet air to
ac 1 in2(6.5 cm2)
per 4,000 btu/h
Inlet air duct
1 in2 (6.5 cm2)
per 4,000 btu/h
Confined
Space
12” (305 mm)
maximum
Gable vent
to outdoors
Install above
insulaon
Figure 5 - Single opening
Confined
Space 1 in2 (6.5 cm2)
per 3,000 btu/h
Alternave
Opening
Locaon
Figure 6 - Two permanent openings
Two permanent
Openings
1 in2 (6.5 cm2)per
1,000 btu/h
12” (305 mm)
maximum
12” (305 mm)
maximum
Confined
Space
Figure 4 - Horizontal duct openings
1 in2 (6.5 cm2)
per 2,000 btu/h
Confined
Space
Outlet
Inlet
Outdoor
Air Ducts
1 in2 (6.5 cm2)
per 2,000 btu/h
Figure 2 - Direct to outdoors openings
Two permanent openings
Two permanent
Openings
1 in
2 (6.5 cm2)
per 4,000 btu/h
12” (305 mm)
maximum
12” (305 mm)
maximum
Confined
Space