Bradford-White EF User Manual

WARNING: If the information in

ULTRA HIGH EFFICIENCY COMMERCIAL GAS WATER HEATER

(EF Series Models)

INTERNET VERSION FOR REFERENCE ONLY

Ambler, PA 19002
Tech. Service [phone]
Service Parts [phone]
Warranty Service [phone]

Part No. 238-44445-00B 03/04

- Do not store or use gasoline or other

- WHAT TO DO IF YOU SMELL GAS

- Installation and service must be

these instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death

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

• 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.

performed by a qualified installer, service
agency or gas supplier

INSTALLATION/OPERATING MANUAL

PLACE THESE INSTRUCTIONS ADJACENT TO WATER HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE

WITH TROUBLESHOOTING GUIDE

2

SECTION I: IMPORTANT INFORMATION

fired water heater is design certified by CSA International under the American National

M (as indicated on the rating

plate) available from CSA Standards Association, 178 Rexdale Blvd., Etobicoke, Ontario, Canada

This water heater must be installed in accordance with local codes. In the absence of local codes, it

Latest Edition), or in

Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B149.2

d throughout this manual to bring attention to the presence of hazards at

p

property damage.

This water heater has a limited warranty. The warranty for this water heater is valid only if the

water heater has been installed, maintained and operated in accordance with these instructions.

NOTICE

TABLE OF CONTENTS

This gas­Standard, Z21.10.3 (as indicated on the rating plate) and CAN/CGA 4.3-

M9W 1R3.

must be installed in compliance with the National Fuel Gas Code (ANSI Z223.1-

Propane Installation Code (Latest Edition).

The following terms are use
various risk levels, or to important information concerning product life.

DANGER

Indicates an imminently
hazardous situation which, if not
avoided, will result in death,
serious injury or substantial

WARNING

Indicates a potentially haza rdous
situation which, if not avoided,
could result in death, serious
injury or substantial property
damage.

INTERNET VERSION FOR REFERENCE ONLY

I IMPORTANT INFORMATION................2

II SPECIFICATIONS....................................5 VIII ELECTRICAL CONNECTIONS...........33

III GENERAL INFORMATION....................6 IX OPERATING INSTRUCTIONS.............34

IV INSTALLATION INSTRUCTIONS.........9 X MAINTENANCE....................................37

V WATER CONNECTIONS.......................15 XI TROUBLE SHOOTING GUIDE............41

VI VENTING................................................18 XII PARTS LIST...........................................43

READ CAREFULLY

CAUTION

Indicates potentially hazardous
situation which, if not avoided,
may result in moderate or minor
injury or property damage.

Indicates special instructions on
installation, operation or
maintenance which are
important but not related to

ersonal injury hazards.

VII GAS CONNECTIONS............................31

NOTICE

3

DANGER

DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors and/or liquids in the vicinity of
this or any other appliance.
DO NOT install any damaged venting system components. If damage is evident then please contact the supplier
where the water heater was purchased or the manufacturer listed on the rating plate for replacement parts.
Use only vent terminals provided or factory authorized terminals for venting this water heater.
This water heater is equipped with an adjustable thermostat to control water temperature. Hot water temperatures
required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/or
death. The temperature at which injury occurs varies with the person’s age and the time of exposure. The slower
response time of disabled persons increases the hazards to them. NEVER allow small children to use a hot water tap,
or to draw their own bath water. NEVER leave a child or disabled person unattended in a bathtub or shower.
Failure to properly install the vent and air intake (if applicable) system could result in property damage, personal
injury, or death

WARNING

Improper installation, adjustments, alteration, service or maintenance can cause property damage, personal injury or
loss of life. Failure to follow all instructions in the proper order can cause personal injury or death. Read and
understand all instructions, including all those provided with the appliance before installing, starting-up, operating,
maintaining or servicing this appliance. Keep this manual and literature in legible condition with this water heater
for reference by owner and service technician.
This water heater requires regular maintenance and service to operate safely. Follow the instructions contained in
this manual.
Installation, maintenance, and service must be performed only by an qualified, skilled and knowledgeable installer
or service provider.
Installation is not complete unless a temperature and pressure relief valve is installed into the proper location at the
top of this water heater.
It is the responsibility of the installing contractor to see that all controls are correctly installed and are properly
operating when the installation is complete.
This water heater is suitable for installation on combustible flooring. Do not install water heater on carpeting.
DO NOT operate this water heater without first being certain it is filled with water.
DO NOT tamper with or alter the water heater and/or controls.
DO NOT operate water heater with jumpered or absent controls or safety devices.
DO NOT operate water heater if any external part has been under water. Immediately call a qualified service
agency to inspect the appliance and to replace any part of the control system including gas controls, which has been
under water.
DO NOT attempt to use this water heater wit h any gas other than the type listed on the rating plate. Do not attempt
to convert this water heater for use with a gas other than the type for which it is equipped. Failure to use the proper
gas can create an unsafe condition resulting in property dama ge, bodily injury, or death. Consult your local gas
supplier or gas company if there are any questions.
DO NOT operate this water heater if the input rate exceeds the rate shown on the water heater rating plate.
This water heater contains very hot water under high pressure. Do not unscrew any pipe fittings nor attempt to
disconnect any components of this water heater without positively assuring the water is cool and is not under
pressure. Always wear protective clothing and equipment when installing, starting up or servicing this water heater
to prevent scald injuries. Do not rely on the temperature gauges to determine the temperature. Do not touch any
components unless they are cool.
This water heater must be properly vented and connected to an approved vent system in good condition. DO NOT
operate water heater with the absence of an approved vent system. A clean and unobstructed vent system is
necessary to allow noxious fumes that could cause injury or loss of life to vent safely and will contribute toward
maintaining the water heater’s efficiency.

INTERNET VERSION FOR REFERENCE ONLY

4

WARNING

Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there is a leak.

tion of leaking

diately call your gas supplier from a telephone in another building. Follow the gas supplier’s

DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!

This water heater needs fresh air for safe operation and must be installed so there are provisions for adequate
combustion and ventilation air. Insufficient air supply will cause a recirculation of combustion products resulting in
contamination that may be hazardous to life. This will result in carboning or sooting of the combustion chamber,
burners, and flue tubes and creates a risk of asphyxiation.
This water heater requires its own separate venting system. DO NOT connect the exhaust vent into an existing vent
pipe or chimney.
Water heater materials of construction, products of combustion and the fuel contain carbon monoxide, nitrogen
oxides, aldehydes and/or other toxic or harmful substances which can cause death or serious injury and which are
known to the state of California to cause cancer, birth defects and other reproductive harm. Always use proper
safety clothing, respirators and equipment when servicing or working nearby this water heater.
Flammable items, pressurized containers or any other potential fire hazardous articles must never be placed on or
adjacent to the water heater. Open containers of flammable material should not be stored or used in the same room
with this water heater.
Insulation blankets are not required for this water heater. This water heater meets or exceeds the ASHRAE/IES

90.1b (latest edition) standards with respect to insulation and standby loss requirements.
Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long
period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To prevent the possibility of
injury under these conditions, we recommend the hot water faucet to be open for several minutes at the kitchen sink
before you use any electrical appliance, which is connect to the hot water system. If hydrogen is present, there will
be an unusual sounds such as air escaping through the pipes as hot water begins to flow. Do not smoke or have open
flame near the faucet at the time it is open.

WARNING

Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumula
gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor.

IF YOU SMELL GAS:

• DO NOT try to light any appliance.

• DO NOT touch any electric switch; do not use any telephone in your building.

• Imme

instructions.

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

INTERNET VERSION FOR REFERENCE ONLY

5

SECTION II: SPECIFICATIONS

Model No.

Outlet

G Fl. to Air

Heating

(LBS)

EF60T125

42 ¼

53 ½

EF60T150

53 ½

EF60T199

EF100T150

EF100T199

EF100T250

EF100T300

53 ½

Input

Del. LPH

Liter

G Fl. to Air

Heating

Shpg.

393.4

457.3

603.2

487.3

645.8

794.9

904.8

1448

1448

1448

1972

1972

1972

1972

Figure 1. Dimensional Layout

Input

Rate

BTU/h

125,000 187 363.6 145.5 103.9 60 96.0 57 28 3/8 5 13 40
150,000 211 422.7 169.1 120.8 60 93.0 57 28 3/8 5 13 40 42 ¼ 52 ½
199,999
150,000
199,999
250,000
300,000

Nat

Model No.

EF60T125
EF60T150
EF60T199
EF100T150
EF100T199
EF100T250
EF100T300

KW

36.6

43.9

58.6

43.9

58.6

73.2

87.9

Recovery GPH

At Degree Rise

1st Hr.

Del.
Gal.

At

100°F

40°F 100°F 140°F

Rise

265

557.6
250
309
364
405

INTERNET VERSION FOR REFERENCE ONLY

1st Hr.

at 56°C

Rise 22°C 56°C 78°C

709.7

799.2

1003.5

947.2

1169.1

1378.0

1531.7

223

450.5

180.2

597

238.8

734.8

293.9

836.4

334.5

Recovery LPH

At Degree Rise

1376.8

1600.5

2111.1

1705.5

2260.3

2782.3

3166.7

550.7

640.2

844.4

682.2

904.1

1112.9

1266.7

158
129
171
210
239

Stg.

Therm.

Cap.

U.S.

Eff.

Gal.

% A Ht. B Dia.

60

92.0

100

99.1

100

98.5

100

97.0

100

92.0

Stg.

Therm.

Cap.

227
227
227
379
379
379
379

Eff.

%

96.0

93.0

92.0

99.1

98.5

97.0

92.0

57
77 5/8
77 5/8
77 5/8
77 5/8

A

Ht.

28 3/8
28 3/8
28 3/8
28 3/8
28 3/8

B

Dia.
718

718
718
718
718
718
718

Flr to

Vent

Outlet

C

Flr to

Vent

Outlet

127
127
127
127
127
127
127

C

5
5
5
5
5

Flr to

Inlet
Wtr.

Conn

D

Flr to

Inlet
Wtr.

Conn

330
330
330
594
594
594
594

DIMENSIONS ( INCHES )

D

E

40
60
60
60
60

F

Fl. to

Wtr.

Conn

42 ¼
62 ½
62 ½
62 ½
62 ½

Intake

52 ½

52 ½
73 1/8
73 1/8
73 1/8
73 1/8

Fl. to

Gas

Conn.

74 ¾
74 ¾
74 ¾
74 ¾

Flr to

T&P
Valve
Conn

13
13
13
13
13

DIMENSIONS ( MILLIMETERS)

E

F

Flr to

T&P

Valve

Conn
1016

1016
1016
1524
1524
1524
1524

Fl. to

Outlet

Wtr.

Conn

1016
1016
1016
1880
1880
1880
1880

Intake

1359
1359
1359
1857
1857
1857
1857

H

Fl. to

Gas

Conn.

1359
1359
1359
1899
1899
1899
1899

H

Front

Space

Conn.

Dia.

1
1
1
1
1

Conn.

Gas

Dia.

19
19
19
19
19
19
19

Gas

Conn.

Dia.

¾
¾
¾
¾
¾

Relief

Valve

Open.

Wtr.

Conn.

Dia.

1 ½ 1 ¾ ¾ 570
1 ½ 1 ¾ ¾ 570
1 ½
1 ½
1 ½
1 ½
1 ½

Front

Space

Wtr.

Conn.

Conn.

Dia.

Dia.

38

25.4

38

25.4

38

25.4

38

25.4

38

25.4

38

25.4

38

25.4

Relief
Valve

Open.

19
19
19
19
19
25
25

¾
¾
¾

1
1

Shpg.

Wt.

570
900
900
900
900

Wt.

(KG)

259
259
259
408
408
408
408

Table 1. Specifications

6

SECTION III: GENERAL INFORMATION

FEATURES

This water heater contains the following features:

MAIN POWER ON/OFF SWITCH – The front panel of this water heater has a lighted ON/OFF switch, which is
illuminated when the main power is turned on to indicate power to the water heater.

COMBUSTION SYSTEM –This water heater is equipped with a self-compensating negative pressure pre-mix
combustion system. As the blower operates, air is drawn in through the air intake and into a venturi, which pulls gas
from the gas valve. The gas and air is then mixed in the combustion blower and sent through the transition tube into
the burner. The Hot Surface Ignition System (HSI) then ignites the gas/air fuel mixture to produce flue products
(combustion). The flame sensor signals the ignition module (described below), that a flame is present.

IGNITION MODULE – The ignition module provides the timing for the combustion system. A sequence of
operation (S-OP) is described in “Section IX - Operating Instruction.” As the combustion system progresses
through the S-OP, LED’s illuminate, allowing accurate trouble -shooting should the need arise. If a failure occurs,
the system will “blink” the LED that corresponds to the failure as described in the “Section XI Troubleshooting
Guide.”

ADJUSTABLE THERMOSTAT – This water heater is equipped with an adjustable thermostat to control water
temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns
resulting in serious personal injury and/or death.

The temperature may be adjusted from about 80°F to about 180°F. The thermostat was adjusted to 120°F before the
water heater was shipped from the factory. It is recommended that lower temperatures be used to avoid the risk of
scalding. Refer to the “Warnings” and the section on SCALDING in “Section V - Water Connections.” It is further
recommended, in all cases, that the water temperature be set for the lowest temperature, which satisfies your hot
water needs. This will also provide the most energy efficient operation of the water heater and minimizes scale
formation.

Setting the water heater temperature at 120°F will reduce the risk of scalds. Some states require setting the specific
lower temperatures.

The top immersion well of the single bulb controlle r also contains the high limit (energy cutoff) sensor. The high
limit switch interrupts the main burner gas flow should the water temperature reach approximately 200°F.

Should the high limit switch activate, it must be manually reset. This can be accomp lished by turning the main
power on/off switch to the off position and then back to the on position and allowing the water temperature of the
tank to drop below 160°F.

Contact your qualified installing contractor, service provider or manufacturer listed on the rating plate if continued
high limit switch operation occurs.

SERVICE PANEL – The service panel is located behind the service panel access cover, which is located by the
exhaust collector near the bottom of the water heater. This panel contains a differential pressure switch that
monitors the pressure across the exhaust orifice. A collector high limit switch is used to monitor the ambient
temperature between the first pass collector and the exhaust collector. This is a manually re -settable switch. If this
switch continues to trip, please contact an authorized service agency.

INTERNET VERSION FOR REFERENCE ONLY

7

LATCHES – The latches allow easy access for servicing the water heater from the top. Simply remove the two
latches for servicing and re -latch upon completion. No tools are required to obtain access to the top of the water
heater.

TEMPERATURE AND PRESSURE RELIEF VALVE –

WARNING

Keep clear of the combination temperature and pressure relief valve discharge line outlet. The
discharg e may be hot enough to cause scald injury. The water is under pressure and may splash.

For protection against excessive temperatures and pressure, install temperature and pressure protective
equipment required by local codes, but not less than a combination temperature and pressure relief
valve certified by a nationally recognized testing laboratory that maintains periodic inspection of
production of listed equipment or materials as meeting the requirements of the Standard for Relief
Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22 and the
Standard CAN1-4.4 Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum
Relief Valves. The combination temperature and pressure relief valve must be marked with a
maximum set pressure not to exceed the maximum working pressure of the water heater. The
combination temperature and pressure relief valve rating must not be less than the hourly rating of the
water heater

Install the combination temperature and pressure relief valve into the opening provided and marked for
this purpose on the water heater.

Note: Some models may already be equipped or supplied with an installed combination temperature
and pressure relief valve. Verify that the combination temperature and pressure relief valve complies
with local codes. If the combination temperature and pressure relief valve does not comply with local
codes, replace it with one that does. Follow the installation instructions above on this page

Install a discharge line so that water discharged from the combination temperature and pressure relief
valve will exit within six (6) inches (15.2 cm) above, or any distance below the structural floor and
cannot contact any live electrical part. The discharge line is to be installed to allow for complete
drainage of both the combination temperature and pressure relief valve and the discharge line. The
discharge opening must not be subjected to blockage or freezing. DO NOT thread, plug or cap the
discharge line. It is recommended that a minimum clearance of four (4) inches (10.0 cm) be provided
on the side of the water heater for servicing and maintenance of the combination temperature and
pressure relief valve.

Do not place a valve between the combination temperature and pressure relief valve and the
tank!

CONDENSATE DRAIN – This water heater is a condensing type unit and requires a drain to be located in close

proximity to allow the condensate to drain safely. The condensate drains from the unit at the exhaust elbow located
near the bottom of the unit. It is important that the condensate hose not be elevated above the exhaust elbow. The
condensate build -up will block the exhaust outlet, which will cause improper operation. Refer to Figure 2 for an
example of a service loop.

INTERNET VERSION FOR REFERENCE ONLY

8

Figure 2. Condensate Elbow With Loop

CLEANOUT – All models are equipped with a cleanout opening to aid in removal of hard water deposits from the

tank bottom. If this water heater operates under hard water conditions, the following should be performed at least
every 3 months: Turn off water supply and drain the water heater. Remove the cleanout jacket cover and tank
cover. When cleaning the tank, care must be taken to avoid trying to break deposits loose as this could damage the
glass lining and shorten the life of the water heater. After cleaning, re -install the cleanout tank cover and jacket
cover, and refill with water. Refer to the section, “Section X – Maintenance” in this Installation and Operating
Instruction manual for the procedures for filling and draining the water heater.

SACRIFICIAL ANODES – Four sacrificial anode rods have been installed in the tank head to extend tank life.
The anode rods should be inspected periodically for corrosion and replaced when necessary to prolong tank life.
Water conditions in your area will influence the time interval for inspection and replacement of the anode rods. The
use of a water softener may increase the speed of anode consumption. More frequent inspection of the anodes is
needed when using softened (or phosphate treated) water. Contact the installing contractor, or service provider that
installed the water heater or the manufacturer listed on the rating plate for anode replacement information.

DISHWASHING MACHINE REQUIREMENTS

All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with
water flow pressures between 15 and 25 pounds per square inch. Flow pressures above 25 pounds per square inch,
or below 15 pounds per square inch, will result in improperly sanitized dishes.

The National Sanitation Foundation also recommends circulation of 180°F water. Where this is done, the
circulation should be very gentle so that it does not cause any unnecessary turbulence inside the water heater. The
circulation should be just enough to provide 180°F water at the point of take-off to the dishwashing machine.
Adjust flow by means of the valve in the circulation line.

INTERNET VERSION FOR REFERENCE ONLY

9

INSTALLATION OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT

OLVED.

K

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT

Liquefied petroleum gases/propane gas and natural gas have an odorant added by the

Other conditions, such as “odorant fade” can cause the odorant to diminish in

ve a diminished sense of smell, or are in any way unsure of the presence of

Gas detectors are available. Contact your gas supplier or plumbing professional for

Liquefied petroleum gases/propane gas is heavier than air and will remain at floor level if there

is a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets

ll around the appliance area for gas.

in another building. Follow the

WARNING

d in an area where leakage of the tank, water line

connections, or the combination temperature and pressure relief valve will not result in

damage to the area adjacent to the water heater or to lower floors of the structure. When

avoided, a suitable drain pan must be installed under the water

heater. The drain pan depth must be suitable for draining and collecting water, and have

a minimum length and width of at least four (4) inches (10.0 cm) measured from the

jacket of the wate

r heater. The drain pan, as described above, can be purchased from

your plumbing professional. The drain pan must be piped to an adequate drain. The

piping must be at least ¾ inch (2.0 cm) in diameter and pitched for proper drainage.

SECTION IV: INSTALLATION INSTRUCTIONS

TO THAT OF A LICENSED TRADESMAN IN THE FIELD INV
PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WOR
ARE REQUIRED.

CERTAIN OF THE FOLLOWING:

•

gas supplier that aids in detection of the gas.

• Most people recognize this odor as a “sulfur” or “rotten egg” smell.

•

intensity, or “fade”, and not be as readily detectable.

• If you ha

gas, immediately contact your gas supplier from a telephone in another building.

•

more informati on.

for accumulation of leaking gas. Before lighting, smell a
Be sure to smell next to the floor.
IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electric switch; do not use any telephone in your building.

• Immediately call your gas supplier from a telephone

gas supplier’s instructions.

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

DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!

This water heater must be locate

INTERNET VERSION FOR REFERENCE ONLY

such locations cannot be

WARNING

10

UNPACKING

INSPECT SHIPMENT carefully for any signs of damage.

1. All equipment is careful ly manufactured, inspected and packed.

2. Any claims for damage or shortage in shipment must be filed immediately with Bradford White
Corporation and noted on the Bill of Lading.

3. Remove all venting components from the combustion assembly compartment by rem oving the latches.

NOTICE

The vent terminals and the condensate elbow that is supplied with this water heater are stored at the top
in the Combustion Assembly Compartment. To access the vent terminals and condensate elbow,
unlatch the top lid and remove parts. Be sure to replace the top and relatch.

LOCATE WATER HEATER in front of final position before removing crate.

1. LOCATE so that venting connections will be short and direct.

2. THIS WATER HEATER IS SUITABLE FOR INSTALLATION ON COMBUSTIBLE FLOOR. Do not
install this water heater on carpeting.

3. FOR BASEMENT INSTALLATION, provide a solid level elevated base such as concrete.

4. Minimum clearance to combustible material is 0” for the Top, Sides, and Rear of this water heater.
However, it is recommended that at least 18” from the Top, 24” from the Front, and 4” for the Sides,
and Rear of the water heater be provided for servicing. Clearance for servicing may be reduced down
to minimum clearance to combustible material, but service time and effort may be greatly increased.

INTERNET VERSION FOR REFERENCE ONLY

Figure 3. Minimum Clearance To Combustible

11

REMOVE CRATE

1. Remove all banding and pry off crate sides carefully so as not to damage the water heater.

2. Carefully roll/lift the water heater from the crate base.

CAUTION

Do not drop water heater. Do not bump water heater jacket against floor.
Do not bump exhaust vent pipe against crate or other objects. This will damage the heater and cause it
to be inoperable or create nuisance problems.

MOVE WATER HEATER TO PERMANENT POSITION by sliding or walking. Place drain pan underneath
water heater

INSTALL TEMPERATURE AND PRESSURE RELIEF VALVE (if not already installed).

WARNING

Temperature and pressure relief valve discharge piping must be piped near floor to eliminate potential
of severe burns . Do not pipe in any area where freezing could occur. Do not install any shut-off
valves, plugs or caps to the temperature and pressure relief valve or pi ping.

CAUTION

If building cold water supply has a back-flow preventer, check valve or water meter with check valve,
provisions for thermal expansion of water in the hot water system must be provided.

DANGER

Temperature setting should not exceed safe temperature at fixtures. See water temperature control
warning on page 16. If higher preheat temperatures are necessary to obtain adequate booster output,
add an anti -scald valve for hot water supplied to fixtures.

LOCATION

KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS, GASOLINE AND
OTHER FLAMMABLE VAPORS AND LIQUIDS.

This water heater must be located in an area where the general public does not have access to set temperatures.

AIR REQUIREMENTS

INTERNET VERSION FOR REFERENCE ONLY

1. Do not obstruct the flow of combustion and ventilating air.

2. For safe operation, adequate air is needed for combustion and ventilation. Sooting may result in serious
damage to the water heater and risk of fire or explosion. It can also create a risk of as phyxiation. Such a
condition often will result in a yellow, luminous burner flame, causing carboning or sooting of the
combustion chamber, burner and flue tubes.

12

MECHANICAL EXHAUSTING OF ROOM AIR

1. Where an exhaust fan is installed in the same room with this water heater and combustion air is drawn
from inside the room, sufficient openings for air must be provided in the walls. UNDERSIZED
OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE WATER
HEATER’S VENTING SYSTEM, CAUSING POOR COMBUSTION THAT MAY BE HAZARDOUS
TO LIFE. SOOTING MAY RESULT IN SERIOUS DAMAGE TO THE WATER HEATER AND
RISK OF FIRE OR EXPLOSION WHICH CAN ALSO CREATE A RISK OF ASPHYXIATION. Refer
to local codes and /or National Fuel Gas Code for proper air opening sizing.

UNCONFINED SPACE

1. In buildings of conventional frame, brick or stone construction, unconfined spaces may provide adequate

air for combustion and ventilation.

2. If the unconfined space is within a building of tight construction (buildings using the following

construction: weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion and
ventilation must be obtained from outdoors. This may be accomplished by piping air directly to the water
heater from outside or providing opening or ducts in the wall. The installation instructions for confined
spaces in tightly constructed buildings must be followed to ensure adequate air supply.

CONFINED SPACE

1. When drawing combustion air from inside a conventionally constructed building to a confined space,
such a space shall be provided with two permanent openings.

• The top opening is to be located within twelve (12) inches of the enclosure top and the bottom

opening within twelve (12) inches of the enclosure bottom.

• Each opening shall have a free area of at least one square inch per 1000 Btu/h of the total input of

all appliances in the enclosure, but not less than 100 square inches.

2. If the confined space is within a building of tight construction, air for combustion and ventilation must be
obtained from outdoors. This may be accomplished by piping air directly to the water heater from
outside or providing opening or ducts in the wall. When directly communicating with the outdoors
through vertical ducts, two permanent openings, located in the above manner, shall be provided.

• Each opening shall have a free area of not less than one square inch per 4000 Btu/h of the total

input of all appliances in the enclosure.

• If horizontal ducts are used, each opening shall have a free area of not less than one square inch

per 2000 Btu/h of the total input of all appliances in the enclosure.

3. If the water heater is installed as a direct vent (outside air piped directly to the water heater), then
additional opening, other than the opening for the air intake, are not required. However, adequate
ventilation air must be provided in all cases to prevent increased room temperature.

CHEMICAL VAPOR CORROSION

Corrosion of the flue ways and vent system will occur if air for combustion contains certain chemical vapors.

INTERNET VERSION FOR REFERENCE ONLY

Such corrosion may result in poor combustion and create a risk of asphyxiation. Spray can propellants,
cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and
sodium chloride, waxes and process chemicals are corrosive. Products of this sort should not be stored near the
water heater or outside by the air intake (if applicable).

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TYPICAL INSTALLATION ILLUSTRATION

CAUTION

If building cold water supply has a back-flow preventer, check valve or water meter with check valve provisions for
thermal expansion of water in the hot water system must be provided.

Figure 4. Typical Front Inlet Connection

INTERNET VERSION FOR REFERENCE ONLY

Figure 5. Typical Front Inlet Connect with Storage Heater

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Figure 6. Typical Two Water Heater Connection

Figure 7. Typical Three Water Heater Connection

INTERNET VERSION FOR REFERENCE ONLY

Figure 8. Typical Four Water Heater Connection