John Wood Atmospheric Gas User Manual

Installation Instructions and Use & Care Guide

RESIDENTIAL GAS WATER HEATERS

CANADIAN MANUAL

FVIR

(FLAMMABLE VAPOR IGNITION RESISTANT)

FOR SPACE HEATING AND POTABLE WATER HEATING ONLY.

This water heater complies with ANSI Z21.10.1-current
edition / CSA 4.1-current edition regarding the accidental
or unintended ignition of fl ammable vapors, such as those
emitted by gasoline.

GAS WATER HEATER

NOT FOR USE IN MOBILE HOMES.

For Your Safety

AN ODORANT IS ADDED TO THE GAS USED

BY THIS WATER HEATER.

• Safety Instructions

• Installation

• Operation

INSTALLER:

• AFFIX THESE INSTRUCTIONS TO OR ADJACENT
TO THE WATER HEATER.

OWNER:

• RETAIN THESE INSTRUCTIONS AND WARRANTY
FOR FUTURE REFERENCE. RETAIN THE
ORIGINAL RECEIPT AS PROOF OF PURCHASE.

WARNING: Gas leaks can not always be detected by
smell.

Gas suppliers recommend that you use a gas detector
approved by UL or CSA.

For more information, contact the your gas supplier.
If a gas leak is detected, follow the “WHAT TO DO IF YOU

SMELL GAS” instructions.

• Care and Maintenance

• Troubleshooting

• Parts List

WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.

— Do not store or use gasoline or other

flammable vapors and liquids in the
vicinity of this or any other appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch;
do not use any phone in your
building.

• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.

• If you cannot reach your gas
supplier, call the fire department.

— Installation and service must be

performed by a qualified installer,
service agency or the gas supplier.

ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED.

IF YOU ARE UNSUCCESSFUL, CONTACT RESIDENTIAL TECHNICAL ASSISTANCE AT 1-800-479-8324 or WWW.JOHNWOODWATERHEATERS.COM.

PRINTED IN THE U.S.A. 0213 PART NO. 325695-000

1

TABLE OF CONTENTS

Water Heater Safety .............................................................................................................................................................................. 1

Safe Installation, Use and Service ...................................................................................................................................................... 3

Safety Precautions ............................................................................................................................................................................ 3-4

Typical Installation ............................................................................................................................................................................... 5

Installing your Gas Water Heater ..................................................................................................................................................... 6-8

Important Information About Your Water Heater ...................................................................................................................... 6

Consumer Information ............................................................................................................................................................. 6

Consumer Responsibilities ...................................................................................................................................................... 6

Unpacking the Water Heater ................................................................................................................................................... 6

Location Requirements ............................................................................................................................................................ 7

Site Location ............................................................................................................................................................................ 7

Clearances and Accessibility ................................................................................................................................................... 8

Gas Supply ....................................................................................................................................................................................... 9-10

Gas Requirements .................................................................................................................................................................... 9

Gas Piping ............................................................................................................................................................................... 9

Gas Pressure ........................................................................................................................................................................... 9

Gas Pressure Testing ............................................................................................................................................................... 9

LP Gas Only ........................................................................................................................................................................... 10

Combustion Air and Ventilation ....................................................................................................................................................11-14

Unconfined Space ...................................................................................................................................................................11

Confined Space ......................................................................................................................................................................11

All Air from Inside the Building ...........................................................................................................................................11-12

All Air from Outdoors .............................................................................................................................................................. 12

Louvers and Grilles ................................................................................................................................................................ 12

Vent Pipe System ............................................................................................................................................................. 12-13

Draft Hood Installation ........................................................................................................................................................... 13

Vent Pipe Size ....................................................................................................................................................................... 13

Vent Connectors .................................................................................................................................................................... 13

Chimney Connection ......................................................................................................................................................... 13-14

Vertical Exhaust Gas Vent ..................................................................................................................................................... 14

Vent Size Verification ............................................................................................................................................................. 14

Water System Piping ..................................................................................................................................................................... 15-17

Piping Installation .............................................................................................................................................................. 15-16

Closed System/Thermal Expansion ....................................................................................................................................... 16

Temperature & Pressure Relief Valve .................................................................................................................................... 16

T&P Relief Valve and Pipe Installation ............................................................................................................................. 16-17

Combination Space Heating/Potable Water System ............................................................................................................. 17

Solar Installation .................................................................................................................................................................... 17

Important Information About this Water Heater ..............................................................................................................................18

Operating Your Water Heater ....................................................................................................................................................... 19-25

Lighting Instructions .......................................................................................................................................................... 19-20

Checking the Draft ................................................................................................................................................................. 21

Burner Flames ....................................................................................................................................................................... 21

Emergency Shutdown ..........................................................................................................

Operating the Temperature Control System ........................................................................................................................... 22

Operational Conditions ..................................................................................................................................................... 22-24

Draining and Flushing ............................................................................................................................................................ 24

Routine Preventive Maintenance ........................................................................................................................................... 24

Temperature and Pressure Relief Valve ........................................................................................................................... 24-25

Maintenance of Your Water Heater .............................................................................................................................................. 25-29

Replacement Parts ................................................................................................................................................................ 25

Removing the Burner from the Manifold/Burner Assembly ................................................................................................... 25

Replacing the Pilot / Thermopile Assembly ........................................................................................................................... 26

External Inspection & Cleaning of the Base-Ring Filter ........................................................................................................ 27

Cleaning the Combustion Chamber and Flame-arrestor ....................................................................................................... 27

Replacing the Manifold Burner/Assembly ......................................................................................................................... 27-28

Piezoelectric Igniter System .................................................................................................................................................. 28

Testing the Igniter System ..................................................................................................................................................... 28

Removing and Replacing the Gas Control Valve/Thermostat ............................................................................................... 28

FVIR System Operational Checklist ...................................................................................................................................... 29

Troubleshooting Checklist ........................................................................................................................................................... 29-30

Pilot Light Troubleshooting Flowchart ............................................................................................................................................ 31

Status Light and Diagnostic Code Troubleshooting Chart .......................................................................................................32-33

Repair Parts ................................................................................................................................................................................... 34-35

Notes .............................................................................................................................................................................................. 36-37

Warranty .......................................................................................................................................................................................... 38-39

Water Temperature Regulation ......................................................................................................................................... 21-22

.................................................. 21

2

SAFE INSTALLATION, USE AND SERVICE

Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.

Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a
potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each
safety message is understood by you and others who install, use or service this water heater.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey
all safety messages that follow this symbol to avoid possible injury or death.

DANGER indicates an imminently hazardous situation which, if not avoided, will result in
death or injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous
situation which, if not avoided, could result in property damage.

All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and
how to avoid the risk of injury.

CAUTION: Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally
two (2) weeks or more). Hydrogen gas is extremely fl ammable and can ignite when exposed to a spark or fl ame. To reduce the risk of injury
under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical
appliance connected to the hot water system. Use caution in opening faucets. If hydrogen is present, there will probably be an unusual sound such
as air escaping through the pipe as the water begins to fl ow. There should be no smoking or open fl ame near the faucet at the time it is open.

IMPORTANT DEFINITIONS

• Qualified Technician: A qualified technician must be licensed/authorized to install gas water heaters and to work with natural/L.P. gas,

gas/air venting, and gas components. He or she must also have appropriate trade knowledge and a thorough understanding of the
requirements of the Natural Gas and Propane Installation Code (CSA B149.1-current edition) as it relates to the installation of gas fired
water heaters. The qualified technician must also be familiar with the design features and use of flammable vapor ignition resistant water
heaters, and have a thorough understanding of this instruction manual.

• Service Agency: Employees/representatives of a service agency must also be licensed/authorized to install gas water heaters and to

work with natural/L.P. gas, gas/air venting, and gas components. Its employees and representatives must also have appropriate trade
knowledge and a thorough understanding of the requirements of the Natural Gas and Propane Installation Code (CSA B149.1-current
edition) as it relates to the installation of gas fired water heaters. The service agency employees/representatives must also have a
thorough understanding of this instruction manual, and be able to perform repairs strictly in accordance with the service guidelines
provided by the manufacturer.

• Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning appliances within this

application. The gas supplier typically has responsibility for the inspection and code approval of gas piping up to and including the Natural
Gas meter or Propane storage tank of a building. Many gas suppliers also offer service and inspection of appliances within the building.

FLAMMABLES

SAFETY PRECAUTIONS

WARNING

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death

Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of this
or any other appliance. Storage of or use of

Flammable Vapors

Read and follow water heater warnings and instructions.

gasoline or other flammable vapors or liquids in the
vicinity of this or any other appliance can result in
serious injury or death.

3

Fire or Explosion Harzard

Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.

Avoid all ignition sources if you smell Natural or LP gas.
Do not expose water heater control to excessive gas
pressure.

Use only gas shown on rating plate.

Maintain required clearances to combustibles.
Keep ignition sources away from faucets after extended
period of non-use.

Read instruction manual before

installing, using or servicing

water heater.

Fire or Explosion Harzard

Hydrogen gas can be produced in a hot water system after

a period of non-use (generally two or more weeks).

Hydrogen gas is extremely flammable and can ignite.

To return hot water system to service, open a hot water
faucet in kitchen for several minutes before using electrical

appliances.
Do not smoke or have open flame near faucet while it is open.
Leave hot water faucet open until the sound of escaping

air stops.

After extended period of non-use,

purge gases from hot water system.

4

TYPICAL INSTALLATION

GET TO KNOW YOUR WATER HEATER - GAS MODELS

A Vent Pipe

B Draft Hood
C Anode (Not Shown)
D Hot Water Outlet
E Insulation
F Gas Supply Piping
G Manual Gas Shut-off Valve
H Ground Joint Union
I Drip Leg (Sediment Trap)

* INSTALL IN ACCORDANCE
WITH LOCAL CODES.

* DRIP LEG AS REQUIRED
BY LOCAL CODES.

TO VENT

TERMINATION ON

ROOF

INSTALL THERMAL EXPANSION

A

TANK IF WATER HEATER IS

CLOSED WATER SYSTEM

J Inner Door
K Outer Door
L Union
M Inlet Water Shut-off Valve
N Cold Water Inlet
O Inlet Dip Tube
P Temperature-Pressure Relief Valve
Q Rating Plate
R Flue Baffl e

INSTALLED IN A

(S) GAS CONTROL VALVE/

THERMOSTAT

Gas Control/Temperature Knob

VAC

S Gas Control Valve/Thermostat
T Drain Valve
U Manifold/Burner Assembly
V Flue
W Metal Drain Pan
X Piezo Igniter
Y Base-Ring Filter

120°F (48.9°C)

Mark

Status
Light

L

D

R

F

G

H

I

B

E

S

V

U

M

N

VACUUM RELIEF

O

T

VALV E

*INSTALL PER

LOCAL CODES

P

Q

DISCHARGE PIPE

(DO NOT CAP OR PLUG.)

Igniter

Temperatures shown are approximates and may vary.

(U) MANIFOLD/BURNER ASSEMBLY

MAIN BURNER

THERMOPILE

MANIFOLD DOOR

12” (300 mm)

MAXIMUM AIR GAP

PILOT TUBE

IGNITER WIRE

MANIFOLD
TUBE

Y

W

* ALL PIPING MATERIALS TO BE
SUPPLIED BY CUSTOMERS.

J

X

K

FLOOR DRAIN

FIGURE 1A.

5

INSTALLING YOUR GAS WATER HEATER

Important Information About This Water Heater

This gas water heater was manufactured to voluntary
safety standards to reduce the likelihood of a flammable
vapor ignition incident. New technology used in meeting
these standards makes this product more sensitive to
installation errors or improper installation environments.
Please review the Installation Checklist found at the end of
the installation instructions section and make any required
installation upgrades or changes.

Consumer Information

This water heater is design-certified by CSA International
as a Category I, non-direct vented water heater which
takes its combustion air either from the installation area or
from air ducted to the unit from the outside.

Installation of this water heater must conform with these
instructions and the local code authority having jurisdiction.

In addition, installations shall comply with the Natural Gas
and Propane Installation Code (CAN/CSA-B149.1-current
edition). This publication is available from the Canadian
Standards Association, 5060 Spectrum Way, Suite 100
Mississauga, Ontario, Canada L4W 5N6.

Check your phone listings for the local authorities having
jurisdiction over your installation.

Unpacking the Water Heater

WARNING

Excessive Weight Hazard

Use two or more people to move and install the water heater.
Failure to do so can result in injury (including back injury).

IMPORTANT: Do not remove any permanent instructions,
labels, or the data label from either the outside of the
water heater or on the inside of water heater panels.

• Remove exterior packaging and place installation com­ponents aside.

• Inspect all parts for damage prior to installation and
start-up.

• Completely read all instructions before attempting to
assemble and install this product.

• After installation, dispose of/recycle all packaging
materials.

Consumer Responsibilities

This manual has been prepared to acquaint you with the
installation, operation, and maintenance of your gas water
heater and provide important safety information in these
areas.

Read all of the instructions thoroughly before attempting
the installation or operation of this water heater.

Do not discard this manual. You or future users of this
water heater will need it for future reference.

Service to the FVIR System should only be performed by a
qualified technician.

Examples of a qualified technician include: licensed
plumbers, authorized gas company personnel, and
authorized service personnel.

IMPORTANT: The manufacturer and seller of this water
heater will not be liable for any damages, injuries, or
deaths caused by failure to comply with the installation and
operating instructions outlined in this manual.

If you lack the necessary skills required to properly install
this water heater, or you have difficulty following the
instructions, you should not proceed but have a qualified
technician perform the installation of this water heater.

A rating plate identifying your water heater can be found
on the front of your water heater. When referring to your
water heater, always have the information listed on the
rating plate readily available. Retain your original receipt
as proof of purchase.

6

Location Requirements

WARNING

Carbon Monoxide Poisoning Hazard

Do not install in a mobile home.
Doing so can result in carbon monoxide poisoning and death.

The FVIR System is designed to reduce the risk of
flammable vapor-related fires. The patented system
protects your family by trapping the burning vapors
within the water heater combustion chamber through the
special flame-arrestor. The burning vapors literally “burn
themselves out” without escaping back into the room.
In the event of a flammable vapor incident, the FVIR
System disables the water heater by shutting off the gas
supply to the water heater’s burner and pilot, preventing
re-ignition of any remaining flammable vapors in the area.
This will not prevent a possible fire/explosion if the igniter
is depressed and flammable vapors have accumulated
in the combustion chamber with the pilot light off. If you
suspect a flammable vapor incident has occurred, do not
use this appliance. Do not attempt to light this appliance,
or depress the igniter button if you suspect flammable
vapors have accumulated inside or outside the appliance.
Immediately call a qualified technician to inspect the
appliance. Water heaters subjected to a flammable vapors
incident will show a discoloration on the flame-arrestor and
require replacement of the entire water heater.

WARNING

FLAMMABLES

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death

Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other
appliance. Storage of or use of gasoline or other
flammable vapors or liquids in the vicinity of this or
any other appliance can result in serious injury or
death.

Read and follow water heater warnings and
instructions

Do not use or store flammable products such as gasoline,
solvents, or adhesives in the same room or area near the
water heater. If such flammables must be used, all gas
burning appliances in the vicinity must be shut off and their
pilot lights extinguished. Open the doors and windows for
ventilation while flammable substances are in use.

Flammable Vapors

If flammable liquids or vapors have spilled or leaked in
the area of the water heater, leave the area immediately
and call the fire department from a neighbor’s home. Do
not attempt to clean the spill until all ignition sources have
been extinguished.

WARNING

Fire or Explosion Hazard

• Read instruction manual before installing, using or
servicing water heater.

• Improper use may result in fire or explosion.

• Maintain required clearances to combustibles.

Keep combustibles such as boxes, magazines, clothes, etc. away
from the water heater area.

Site Location

• Select a location near the center of the water piping
system. The water heater must be installed indoors
and in a vertical position on a level surface. DO NOT
install in bathrooms, bedrooms, or any occupied room
normally kept closed.

• Locate the water heater as close to the chimney or gas
vent as practical. Consider the vent system piping and
combustion air supply requirements when selecting the
water heater location. The venting system must be able
to run from the water heater to termination with minimal
length and elbows.

• Locate the water heater near the existing gas piping.
If installing a new gas line, locate the water heater to
minimize the pipe length and elbows.

• The water heater should be located in an area not
subject to freezing temperatures. Water heaters
located in unconditioned spaces (i.e., attics,
basements, etc.) may require insulation of the water
piping and drain piping to protect against freezing.
The drain and controls must be easily accessible for
operation and service. Maintain proper clearances as
specified on the rating plate.

• Do not locate the water heater near an air-moving
device. The operation of air-moving devices such
as exhaust fans, ventilation systems, clothes dryers,
fireplaces, etc., can affect the proper operation of the
water heater. Special attention must be given to condi­tions these devices may create. Flow reversal of flue
gases may cause an increase of carbon monoxide
inside of the dwelling (Figure 1C).

• If the water heater is located in an area that is
subjected to lint and dirt, it may be necessary to
periodically clean the base-ring filter and flame­arrestor. Refer to the “Maintenance of your Water
Heater” section.

NOTE: This water heater must be installed according to CAN/
CSA B149.1-current edition (Natural Gas and Propane
Installation Code) and all local/provincial codes.

7

IMPORTANT: The water heater should be located in an area
where leakage of the tank or connections will not result in
damage to the area adjacent to the water heater or to lower
floors of the structure. Due to the normal corrosive action of
water, the tank will eventually leak after an extended period
of time. Also any external plumbing leak, including those
from improper installation, may cause early failure of the
tank due to corrosion if not repaired. If the homeowner is
uncomfortable with making the repair a qualified technician
should be contacted. A suitable metal drain pan should be
installed under the water heater as shown below, to help
protect the property from damage which may occur from
condensate formation or leaks in the piping connections or
tank. The pan must limit the water level to a maximum depth
of 1-3/4” (4.45 cm) and be two inches (5 cm) wider than the
heater and piped to an adequate drain. NOTE: The metal
drain pan must not restrict combustion air flow. Locate the
water heater near a suitable indoor drain. Outside drains are
subject to freezing temperatures which can obstruct the drain
line. The piping should be at least 3/4” ID and pitched for
proper drainage.

DISCHARGE PIPE
(DO NOT CAP OR PLUG)

METAL
DRAIN
PAN

AT LEAST 2 in. (5 cm) GREATER
THAN THE DIAMETER OF THE
WATER HEATER.

FIGURE 1B.

PIPED TO AN
ADEQUATE DRAIN

12 in. (300 mm)
MAXIMUM
AIR GAP

Water heater life depends upon water quality, water usage,
water temperature and the environment in which the
water heater is installed. Water heaters are sometimes
installed in locations where leakage may result in property
damage, even with the use of a drain pan piped to a
drain. However, unanticipated damage can be reduced
or prevented by a leak detector or water shut-off device
used in conjunction with a piped drain pan. These devices
are available from some plumbing supply wholesalers and
retailers, and detect and react to leakage in various ways:

• Sensors mounted in the drain pan that trigger an alarm
or turn off the incoming water to the water heater when
water is detected.

• Sensors mounted in the drain pan that turn off the
water supply to the entire home when water is detected
in the drain pan.

• Water supply shut-off devices that activate based on
the water pressure differential between the cold water
and hot water pipes connected to the water heater.

• Devices that will turn off the gas supply to a gas water
heater while at the same time shutting off its water supply.

EXHAUST FAN

REVERSE FLOW
OF GASES

FIGURE 1C.

Clearances and Accessibility

NOTE: Minimum clearances from combustible surfaces are
stated on the rating plate adjacent to the gas control valve/
thermostat of the water heater.

The water heater is certified for installation on a
combustible floor.

• IMPORTANT: If installing over carpeting, the carpeting
must be protected by a metal or wood panel beneath
the water heater. The protective panel must extend
beyond the full width and depth of the water heater by
at least three inches (7.62 cm) in any direction; or if in
an alcove or closet installation, the entire floor must be
covered by the panel.

• Figure 2 may be used as a reference guide to locate
the specific clearance locations. A minimum of 24
inches (61 cm) of front clearance should be provided
for inspection and service.

VENT

TOP

TO

CEILING

SIDES

BACK

TOP
VIEW

8

SIDES

FRONT
24 in.
(61 cm)
MINIMUM
FOR SERVICE

FIGURE 2.

GAS SUPPLY

WARNING

Explosion Hazard

• Use a new CSA approved gas supply line.

• Install a shut-off valve.

• Do not connect a natural gas water heater to an L.P. gas
supply.

• Do not connect an L.P. gas water heater to a natural gas
supply.

• Failure to follow these instructions can result in death,
explosion, or carbon monoxide poisoning.

Gas Requirements

IMPORTANT: Read the rating plate to be sure the water
heater is made for the type of gas you will be using in
your home. This information will be found on the rating
plate located near the gas control valve/thermostat. If the
information does not agree with the type of gas available,
do not install or light. Call your dealer.

NOTE: An odorant is added by the gas supplier to the gas
used by this water heater. This odorant may fade over an
extended period of time. Do not depend upon this odorant

as an indication of leaking gas.

Gas Piping

MANUAL GAS

SHUT-OFF VALVE

GROUND JOINT

UNION

CHECK WITH LOCAL UTILITY

FOR MINIMUM HEIGHT

3 in. (7.62 cm) MINIMUM

DRIP LEG

FIGURE 3.

12 in. (300mm)
MAXIMUM AIR GAP

Gas Pressure

WARNING

Explosion Hazard

• Gas leaks can not always be detected by smell.

• Gas suppliers recommend that you use a gas
detector approved by UL or CSA.

• For more information, contact your gas supplier.

• If a gas leak is detected, follow the “What to do if you
smell gas” instructions on the cover of this manual.

The gas piping must be installed according to CAN/
CSA B149.1-current edition (Natural Gas and Propane
Installation Code) and all local/provincial codes. Consult
the Natural Gas and Propane Installation Code (CAN/CSA
B149.1) for information on the correct sizing of gas pipe and
other materials.

NOTE: Use pipe joint compound or teflon tape marked as
being resistant to the action of petroleum [Propane (L.P.)]
gases (See Figure 3.)

1. Install a readily accessible manual shut-off valve in the
gas supply line as recommended by the local utility.
Know the location of this valve and how to turn off the
gas to this unit.

2. Install a drip leg (if not already incorporated as part of
the water heater) as shown. The drip leg must be no
less than three inches long for the accumulation of dirt,
foreign material, and water droplets.

3. Install a ground joint union between the gas control
valve/thermostat and the manual shut-off valve. This
is to allow easy removal of the gas control valve/
thermostat.

4. Turn the gas supply on and check for leaks. Test all
connections by brushing on an approved noncorrosive
leak-detection solution. Bubbles will show a leak.

Correct any leak found.

IMPORTANT: The gas supply pressure must not exceed the
maximum supply pressure as stated on the water heater’s rating
plate. The minimum supply pressure is for the purpose of input

adjustment.

Gas Pressure Testing

IMPORTANT: This water heater and its gas connection must
be leak tested before placing the appliance in operation.

• If the code requires the gas lines to be tested at a
pressure exceeding 14” W.C. (3.486 kPa), the water heater
and its manual shut-off valve must be disconnected from
the gas supply piping system and the line capped.

• If the gas lines are to be tested at a pressure less than 14”
W.C. (3.486 kPa), the water heater must be isolated from
the gas supply piping system by closing its manual shut­off valve.

NOTE: Air may be present in the gas lines and could prevent
the pilot from lighting on initial start-up. The gas lines should
be purged of air by a qualified technician after installation of
the gas piping system. While purging the gas piping system
of air, insure that the fuel is not spilled in the area of the
water heater installation, or any source of ignition. If the
fuel is spilled while purging the piping system of air follow
the “WHAT TO DO IF YOU SMELL GAS” instructions on
the cover of this manual.

9

LP Gas Only

WARNING

Explosion Hazard

Have a qualified technician make sure L.P. gas pressure
does not exceed 13” water column (3.237 kilopascals).

Failure to do so can result in death, explosion, or fire.

Liquefied petroleum gas is over 50% heavier than air
and in the occurrence of a leak in the system, the gas
will settle at floor level. Basements, crawl spaces, closets
and areas below ground level will serve as pockets for
the accumulation of gas. Before lighting an L.P. gas water
heater, smell all around the appliance at floor level. If you
smell gas, follow the instructions as given in the warning
on the front page.

When your L.P. tank runs out of fuel, turn off the gas at
all gas appliances including pilot lights. After the tank is
refi lled, all appliances must be re-lit according to their
manufacturer’s instructions.

10

COMBUSTION AIR & VENTILATION

WARNING

Carbon Monoxide Warning

Follow all the local and provincial codes or, in the
absence of local and provincial codes, the “Natural Gas
and Propane Installation Code,” CSA B149.1-current
edition to properly install vent system.

Failure to do so can result in death, explosion, or
carbon monoxide poisoning.

IMPORTANT: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to
corrosive elements in the atmosphere is excluded from
warranty coverage.

The following types of installation (not limited to the
following) will require outdoor air for combustion due to
chemical exposure and may reduce but not eliminate the
presence of corrosive chemicals in the air:

• beauty shops

• photo processing labs

• buildings with indoor pools

• water heaters installed in laundry, hobby, or craft
rooms

• water heaters installed near chemical storage areas

Combustion air must be free of acid-forming chemicals such
as sulfur, fluorine, and chlorine. These elements are found
in aerosol sprays, detergents, bleaches, cleaning solvents,
air fresheners, paint, and varnish removers, refrigerants,
and many other commercial and household products. When
burned, vapors from these products form highly corrosive
acid compounds. These products should not be stored or
used near the water heater or air inlet.

Combustion and ventilation air requirements are determined
by the location of the water heater. The water heater may
be located in either an open (unconfined) area or in a
confined area or small enclosure such as a closet or small
room. Confined spaces are areas with less than 50 cubic
feet for each 1,000 BTU/HR (4.8 cubic metres per kilowatt)
of the total input for all gas-using appliances.

Unconfined Space

A water heater in an unconfined space uses indoor air for
combustion and requires at least 50 cubic feet for each
1,000 BTU/HR (4.8 cubic metres per kilowatt) of the total
input for all gas appliances. The following table shows a
few examples of the minimum area required for various
BTU/HR inputs.

TABLE 1

Minimum Square

Feet

BTU/HR (kW)

Input

30,000 (8.79) 188 (17.47) 9’ x 21’ (2.7 m x 6.4 m)
45,000 (13.18) 281 (26.10) 14’ x 20’ (4.3 m x 6.1 m)
60,000 (17.58) 375 (34.84) 15’ x 25’ (4.6 m x 7.6 m)
75,000 (21.97) 469 (43.57) 15’ x 31’ (4.6 m x 9.4 m)
90,000 (26.37) 563 (52.30) 20’ x 28’ (6.1 m x 8.5 m)
105,000 (30.76) 657 (61.04) 20’ x 33’ (6.1 m x 10.1 m)
120,000 (35.15) 750 (69.68) 25’ x 30’ (7.6 m x 9.1 m)
135,000 (39.55) 844 (78.41) 28’ x 30’ (8.5 m x 9.1 m)

IMPORTANT:

• The area must be open and be able to provide the
proper air requirements to the water heater. Areas that
are being used for storage or contain large objects
may not be suitable for water heater installation.

• Water heaters installed in open spaces in buildings
with unusually tight construction may still require out­door air to function properly. In this situation, outside
air openings should be sized the same as for a con­fined space.

• Modern home construction usually requires supplying
outside air into the water heater area.

(Square Metres)

with 8 Foot

(2.44 Metre)

Ceiling

Typical Room

with 8 Foot

(2.44 Metre)

Ceiling

Confined Space

For the correct and proper operation of this water heater,
ample air must be supplied for the combustion, ventilation,
and dilution of flue gases.

The size of openings (free areas) is determined by the total
BTU/HR input of all gas utilization equipment (i.e., water
heaters, furnaces, clothes dryers, etc.) and the method
by which the air is provided. The BTU/HR input can be
found on the water heater rating plate. Additional air can be
provided by two methods:

1. All air from inside the building.

2. All air from outdoors.

All Air from Inside the Building

When additional air is to be provided to the confined area
from additional room(s) within the building, the total volume
of the room(s) must be of sufficient size to properly provide
the necessary amount of fresh air to the water heater
and other gas utilization equipment in the area. If you are
unsure that the structure meets this requirement, contact
your local gas utility company or other qualified agency for
a safety inspection.

When indoor air is used, small enclosures and confined
areas must have two permanent openings so that sufficient
fresh air can be drawn from outside of the enclosure. The
bottom opening must be no lower than 6 inches (150 mm)
and no more than 18 inches (45.7 cm) above floor level.
The top opening must have the same area as the bottom
opening and be located as close to the ceiling as possible.

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However, it must never be lower than the relief opening of

OSS

the draft hood. See Figure 4.

PERMANENT

OPENINGS TO

ADDITIONAL

ROOMS WITHIN

THE BUILDING

AS CLOSE TO CEILING AS P

IBLE AND

ABOVE DRAFT HOOD.

CLOSET

OR

OTHER

CONFINED

SPACE

12 in.
(30.5 cm)
MINIMUM
ABOVE GRADE
& SNOW LEVELS

GRADE

COMBINATION
COMBUSTION/

VENTILATION

AIR DUCT

WITHIN 12 in. (30.5 cm)
ABOVE BURNER LEVEL

CONFINED

SPACE

WITHIN 24 in. (61 cm)

BASEMENT INSTALLATION, EQUIPMENT LOCATED
IN CONFINED SPACES; ALL AIR FROM OUTDOORS

FIGURE 6.

NO LESS THAN 6 INCHES (15.2 cm) AND
NO MORE THAN 18 INCHES (45.7 cm)
ABOVE FLOOR LEVEL.

FIGURE 4.

Each of the two openings shall have a minimum free area
of 1 square inch per 1,000 BTU/HR (2225mm² per kW) of
the total input rating of all gas utilization equipment in the
confined area, but not less than 100 square inches (645.16
cm2). See Figure 5.

CONFINED

SPACE

PERMANENT

OPENINGS

1 SQUARE
INCH/1000

BTUH

(MINIMUM
100 SQ. IN.)
See text for
metric values.

FIGURE 5.

For specific ventilation and combustion air requirements,
consult the Natural Gas and Propane Installation Code
(CAN/CSA B149.1-current edition) and the local codes of
your area.

All Air from Outdoors

An opening may be used in lieu of a duct to provide the
outside air supply. It, too, must be located within 1 foot
(30.5 cm) above, and within 2 feet (61 cm) horizontally from,
the burner level of the appliance having the largest input.
However, it must be located at least 12 inches (30.5 cm)
above the outside grade level and be clear of snow levels.
In addition, it must be equipped with a means to prevent the
direct entry of rain and wind without reducing the required
free area of the opening.

The size of openings is determined by the method in which the
air is to be provided. For specific ventilation and combustion air
requirements, consult the Natural Gas and Propane Installation
Code (CAN/CSA B149.1-current edition) and the local codes of
your area.

Louvers and Grilles

In calculating free area for ventilation and combustion
air supply openings, consideration must be given to the
blocking effect of protection louvers, grilles, and screens.
These devices can reduce airflow, which in turn may
require larger openings to achieve the required minimum
free area. Screens must not be smaller than 1/4” (6.35
mm) mesh. If the free area through a particular design of
louver or grille is known, it should be used in calculating
the specified free area of the opening. If the design and
free area are not known, it can be assumed that most
wood louvers will allow 20 - 25% of free area while metal
louvers and grilles will allow 60 - 75% of free area.

Louvers and grilles must be interconnected with the
equipment so that they are opened automatically during
equipment operation. Also, keep louvers and grilles clean
and free of debris or other obstructions. Do not use
manually adjustable louvers.

Outdoor fresh air can be provided to a confined area either
directly or by the use of ducts. The fresh air can be taken
from the outdoors or from crawl or attic spaces that freely
communicate with the outdoors. Attic or crawl spaces
cannot be closed and must be properly ventilated to the
outside.

Ductwork must be of the same cross-sectional area as
the free area of the opening to which they connect. The
minimum dimension of rectangular air ducts cannot be less
than three inches (7.62 cm). In addition, the duct must
terminate within 1 foot (30.5 cm) above, and within 2 feet
(61 cm) horizontally from, the burner level of the appliance
having the largest input. See Figure 6.

Vent Pipe System

This water heater uses a non-direct, single-pipe vent
system to remove exhaust gases created by the burning of
fossil fuels. Air for combustion is taken from the immediate
water heater location or is ducted in from the outside (see
“Combustion Air Supply and Ventilation.”)

This water heater must be properly vented for the removal
of exhaust gases to the outside atmosphere. Correct
installation of the vent pipe system is mandatory for the
proper and efficient operation of this water heater and is
an important factor in the life of the unit.

The vent pipe must be installed according to CAN/

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