A.O. Smith BTF-75 User Manual

MODEL BTF-75 with Hot Surface Ignition & SmartV alve

COMMERCIAL GAS, GLASS-LINED, T ANK-TYPE WA TER HEA TER

• SAFETY • INST ALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY

Thank you for buying this energy efficient water heater from A.O. Smith
Water Products Company. We appreciate your confidence in our
products.

®

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELA TIVE TO YOUR SAFETY .
THOROUGHLY BEFORE INST ALLING AND USING THIS
APPLIANCE.

A DIVISION OF A.O. SMITH CORPORATION

McBee, South Carolina U.S.A.

Stratford, Ontario Canada

® SmartValve is a Registered Trademark of Honeywell Inc.

KEEP THIS MANUAL IN THE POCKET ON THE HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

PRINTED IN U.S.A. 0901 PART NO. 194643-000

1

www.hotwater.com

PLEASE READ

ROUGH-IN-DIMENSIONS

TOP VIEW

*INST ALL IN ACCORDANCE WITH LOCAL CODES

FIGURE 1

ALL DIMENSIONS IN INCHES

Model Units A B C D E F G H J K L M

BTF-75 Inches 66 5/16 58 1/2 29 5/8 25 3/8 15 3/16 4 14 16 1 1/4 1 1/2 11 15/16

cm 168.4 148.6 75.2 64.5 38.6 10.2 35.6 40.6 3.2 NPT NPT 30.3

RECOVERY CAP ACITIES

Input Approx. Approx. Temp. °C 17 22 28 33 39 44 50 56 61 67 72 78

Model Rating Rating Gal. Liter

Btu/Hr KW/Hr Cap. Cap. Rise ° F 30 40 50 60 70 80 90 100 110 120 130 140

BTF-75 80,000 23.4 74 284 LPH 979 734 587 489 419 367 326 294 267 245 226 210

GPH 259 194 155 129 111 97 86 78 71 65 60 55

Recovery capacity based on 80% thermal efficiency.

FOREWORD

The design of model BTF-75 complies with the latest version of
ANSI Z21.10.3/CSA 4.3 M98 as automatic storage or automatic circulating
tank type water heaters.

Installation diagrams are found in this manual. These diagrams will serve
to provide the installer with a reference for the materials and method of
piping necessary. It is highly essential that all water and gas piping be
installed as shown on the diagrams.

In addition to these instructions, the equipment shall be installed in
accordance with those installation regulations in force in the local area

where the installation is to be made. These shall be carefully followed
in all cases. Authorities having jurisdiction should be consulted before
installations are made.

The installation must conform to these instructions and the local code
authority having jurisdiction. In the absence of local codes, the installation
must comply with the latest editions of the National Fuel Gas Code,
ANSI Z223.1/NFPA 54. The NFP A. This is available from the Canadian
Standards Association, 8501 East Pleasant V alley Road, Cleveland, OH
44131, or the National Fire Protection Association, 1 Batterymarch Park,
Quincy, MA 02269.

2

TABLE OF CONTENTS

PAGE

ROUGH-IN DIMENSIONS ..............................................................2

FOREWORD ...............................................................................2

GENERAL SAFETY INFORMATION

Precautions ............................................................................ 3

Chemical Vapor Corrosion ......................................................3

Improper Combustion ..............................................................3

Liquid Petroleum Models........................................................ 3-4

Extended Non-Use periods ..................................................... 4

Insulation Blankets ..................................................................4

Circulating Pump .....................................................................4

Dishwashing Machine Requirements ......................................4

INST ALLATION

Required Ability ......................................................................4

General .................................................................................. 4

Grounding ..............................................................................4

High Altitude Installation ..........................................................4

Location Of Heater ...............................................................4-5

Air Requirements ....................................................................5

Unconfined Space ..................................................................5

Confined Space...................................................................... 5

Water Connections .................................................................5

Water (Potable) Heating & Space Heating ............................. 5-6

Closed Water System .............................................................6

Relief Valve............................................................................6

Venting...................................................................................6

Vent Pipe T ermination............................................................ 6-7

Planning The Vent System .................................................... 7-8

P AGE

Installation Of Sidewall Vent System.......................................7

Vent T erminal Installation, Sidewall..........................................7

Preparation Of Blower Assembly ......................................... 8-9

Installation Of Vent System, Sidewall.....................................10

Installation Of Vertical V ent System ....................................... 10

Vent Pipe Preparation ......................................................... 10-12

Gas Connections ...................................................................12

Connection of Gas Pipe ......................................................... 12

OPERATION

T o Operate Heater .................................................................1 2

Lighting & Operating Label .....................................................13

Purging ..................................................................................14

T emperature Regulation .........................................................1 4

MAINTENANCE

Main Burner ...........................................................................14

High T emperature Cut-Off Switch .......................................... 15

Venting System .....................................................................15

Power Venter Maintenance ................................................... 15

T & P V alve............................................................................15

Draining................................................................................. 15

Main Burner And Igniter ...................................................... 15-16

Condensation ........................................................................ 16

Cathodic Protection - Anode .................................................. 16

Service & Repair ...................................................................16

TROUBLE SHOOTING ............................................................. 16-19

LIMITED WARRANTY .................................................................20

GENERAL SAFETY INFORMATION

PRECAUTIONS

DO NOT USE THIS APPLIANCE IF ANY P ART HAS BEEN UNDER WA TER.
Immediately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control which
has been under water.

IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERA TE HEATER
UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED
SERVICEMAN.

1. EXTERNAL FIRE.

2. DAMAGE.

3. FIRING WITHOUT WA TER.

4. SOOTING.

CHEMICAL VAPOR CORROSION

WARNING

CORROSION OF THE FLUEWA YS AND VENT SYSTEM MAY OCCUR IF
AIR FOR COMBUSTION CONT AINS CERTAIN CHEMICAL V APORS. SUCH
CORROSION MA Y RESULT IN F AILURE AND RISK OF ASPHYXIATION.

Spray can propellants, cleaning solvents, refrigerator and air conditioning
refrigerants, swimming pool chemicals, calcium and sodium chloride
(water softener salt), waxes, and process chemicals are typical
compounds which are potentially corrosive.

Do not store products of this sort near the heater. Also, air which is
brought in contact with the heater should not contain any of these
chemicals. If necessary , uncontaminated air should be obtained from
remote or outside sources. The limited warranty is voided when failure
of water heater is due to a corrosive atmosphere. (Refer to the limited
warranty for complete terms and conditions).

IMPROPER COMBUSTION

WARNING

A TTIC AND/OR EXHAUST FANS OPERA TING ON THE PREMISES WITH A
WA TER HEATER CAN RESUL T IN CARBON MONOXIDE POISONING AND
DEA TH.

OPERATION OF THESE F ANS CAN PRODUCE A NEGA TIVE DRAFT IN
THE AREA OF THE WA TER HEATER PREVENTING THE PRODUCTS OF
COMBUSTION FROM EXHAUSTING THROUGH THE VENT PIPE.

The venting of the water heater should be inspected by a qualified service
technician at the time of installation and periodically thereafter to ensure
a down-draft condition does not exist.

DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILA TING
AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILA TION MUST BE
PROVIDED FOR SAFE OPERA TION.

LIQUID PETROLEUM MODELS

WARNING

Water heaters for propane or liquefied petroleum gas (LPG) are dif ferent
from natural gas models. A natural gas heater will not function safely
on LP gas and no attempt should be made to convert a heater from
natural gas to LP gas.

LP gas must be used with great caution. It is highly explosive and heavier
than air. It collects first in the low areas making its odor dif ficult to detect
at nose level. If LP gas is present or even suspected, do not attempt to
find the cause yourself. Go to a neighbor's house, leaving your doors
open to ventilate the house, then call your gas supplier or service agent.
Keep area clear until a service call has been made.

At times you may not be able to smell an LP gas leak. One cause is odor
fade, which is a loss of the chemical odorant that gives LP gas its
distinctive smell. Another cause can be your physical condition, such
as having a cold or a diminishing sense of smell with age. For these
reasons, the use of a propane gas detector is recommended.

3

IF YOU EXPERIENCE AN OUT-OF-GAS SITUA TION, DO NOT TRY TO
RELIGHT APPLIANCES YOURSELF . Ask your LP delivery person to relight
pilots for you. Only trained LP professionals should conduct the required
safety checks in accordance with industry standards.

EXTENDED NON-USE PERIODS

WARNING

HYDROGEN GAS CAN BE PRODUCED IN A HOT WA TER SYSTEM
SERVED BY THIS HEA TER THAT HAS NOT BEEN USED FOR A LONG
PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).
GAS IS EXTREMELY FLAMMABLE. 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. If hydrogen is present,
there will probably be an unusual sound such as air escaping through
the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING

OR OPEN FLAME NEAR THE FAUCET A T THE TIME IT IS OPEN.

HYDROGEN

INSULATION BLANKETS

All dishwashing machines meeting the National Sanitation Foundation
requirements are designed to operate with water flow pressures
between 15 and 25 psi (103Kpa and 173 Kpa). Flow pressures above
25 psi (173Kpa), or below 15 psi (103 Kpa), will result in improperly
sanitized dishes. Where pressures are high, a water pressure reducing
or flow regulating control valve should be used in 180
dishwashing machine, and should be adjusted to deliver water between
these limits.

The National Sanitation Foundation also recommends circulation of 180
(82°C) 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
water at the point of take-off to the dishwashing machine. Adjust flow
by means of the plug cock in the circulating line.

0

F line to the

0

F (82°C)

INSTALLATION

REQUIRED ABILITY

0

F

Insulation blankets available to the general public for external use on
gas water heaters are not necessary with A.O. Smith products. The
purpose of an insulation blanket is to reduce the standby heat loss
encountered with storage tank heaters. Y our A.O. Smith water heater
meets and exceeds the National Appliance Energy Conservation Act
standards with respect to insulation and standby loss requirements,
making an insulation blanket unnecessary.

WARNING

Should you choose to apply an insulation blanket to this heater, you
should follow these instructions. Failure to follow these instructions
can restrict the air flow required for proper combustion, potentially
resulting in fire, asphyxiation, serious personal injury or death.

Do not cover the gas valve or temperature & pressure relief valve.

•
Do not allow insulation to come within 2" of the air inlet box, to prevent

•
blockage of the dilution air.

Do not allow insulation to come within 2" of the floor to prevent

•
blockage of combustion air flow to the burner.

•

Do not cover the instruction manual. Keep it on the side of the water
heater or nearby for future reference.

• Do obtain new warning and instruction labels from A.O. Smith for
placement on the blanket directly over the existing labels.

Do inspect the insulation blanket frequently to make certain it does

•
not sag, thereby obstructing combustion air flow.

CIRCULATING PUMP

A circulating pump is used when a system requires a circulating loop or
there is a storage tank used in conjunction with the heater. Refer to the
piping diagrams at rear of manual for electrical hookup information and
install in accordance with the latest version of the
ANSI/NFPA No. 70.

Only all bronze circulators are used with commercial water heaters.
Although circulators are oiled and operated by the manufacturer some

circulators must be oiled again before operating. Please refer to
manufacturer’s instructions.

National Electric Code

DISHWASHING MACHINE REQUIREMENT

These appliances meet the National Sanitation Foundation Standard for
sanitary installations when used with the following leg kits, Part No’s.
6570-0 and 6570-7.

INSTALLA TION OR SERVICE OF THIS WA TER HEA TER REQUIRES ABILITY
EQUIV ALENT TO THA T OF A LICENSED TRADESMAN IN THE FIELD
INVOL VED. PLUMBING, ELECTRICAL AIR SUPPLY , VENTING AND GAS
SUPPL Y ARE REQUIRED.

GENERAL

The heater is designed to operate on natural or propane gases.
HOWEVER, MAKE SURE the gas on which the heater will operate is the
same as that specified on the heater model and rating plate. The
installation must conform to these instructions and the local code authority
having jurisdiction. In the absence of local codes, conform to the latest
edition of National Fuel Gas Code ANSI Z223.1/NFP A 54 and the National
Electric Code, NFPA 70. The former is available from the Canadian
Standards Association, 8501 East Pleasant V alley Road, Cleveland, OH
44131, and both documents are available from the National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.

GROUNDING

The water heater, when installed, must be grounded in accordance with
local codes, or in the absence of local codes: The National Electric
Code, ANSI/NFPA 70;

HIGH ALTITUDE INSTALLATION

CAUTION

INST ALLATIONS ABOVE 2000 FT. REQUIRE REPLACEMENT OF THE
BURNER ORIFICE IN ACCORDANCE WITH THE NA TIONAL FUEL GAS
CODE (ANSI Z223.1/NFPA 54). F AILURE TO REPLACE THE ORIFICE
COULD RESUL T IN IMPROPER AND INEFFICIENT OPERATION OF THE
APPLIANCE, PRODUCING CARBON MONOXIDE GAS IN EXCESS OF SAFE
LIMITS, WHICH COULD RESULT IN SERIOUS PERSONAL INJUR Y OR
DEA TH. CONTACT YOUR GAS SUPPLIER FOR ANY SPECIFIC CHANGES
WHICH MA Y BE REQUIRED IN YOUR AREA.

A.O. SMITH BUILDS SOME MODELS SPECIFICALLY FOR HIGH AL TITUDE
SERVICE.

PLEASE CHECK THE RATING PLA TE BEFORE MAKING CHANGES.

LOCATION OF HEATER

When installing the heater, consideration must be given to proper location.
Location selected should be as close to the wall as practicable with
adequate air supply and as centralized with the water piping system as
possible.

4

The heater is design certified by the Canadian Standards for installation
on combustible flooring in a closet having minimum clearances from
combustible material of: 2" clearance from sides and rear, 6" from the
front and 24" from the top. (Standard clearance.) If clearances stated
on the heater differ from standard clearances, install water heater
according to clearances stated on heater.

A minimum clearance of 4" must be allowed for access to replaceable
parts such as the thermostats, drain valve and relief valve. A top
clearance of 24" should be allowed for blower assembly service.

Adequate clearance for servicing this appliance should be considered
before installation, such as changing the anodes, etc. Minimum
clearances for proper operation are given above.

WARNING

In cold climates provide protection against freeze-up.
THE HEA TER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE OF

THE TANK OR CONNECTIONS WILL NOT RESUL T IN DAMAGE TO THE
AREA ADJACENT TO THE HEA TER OR TO LOWER FLOORS OF THE
STRUCTURE. When such locations cannot be avoided, a suitable drain

pan should be installed under the heater, see fig. 1. The pan must not
restrict combustion air flow. Such pans should have a minimum length
and width of at least 2 inches greater than the diameter of the heater
and should be piped to an adequate drain. Drain pans suitable for these
heaters are available from your dealer or A. O. Smith Water Products
Company, 5621 W . 1 15th Street, Alsip, Illinois 60803.

If the confined space is within a building of tight construction, air for
combustion, ventilation and power venter dilution must be obtained from
outdoors. When directly communicating with the outdoors or
communicating 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 Btuh 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 Btuh of
the total input of all appliances in the enclosure.

WARNING

DO NOT INST ALL THIS WA TER HEATER DIRECTL Y ON A CARPETED
FLOOR. A FIRE HAZARD MA Y RESUL T . Instead the water heater must

be placed on a metal or wood panel extending beyond the full width and
depth by at least 3 inches (76.2mm) in any direction. If the heater is
installed in a carpeted alcove or closet, the entire floor shall be covered
by the panel.

AIR REQUIREMENTS

In calculating the free area of a vent opening, the blocking effect of
screens, louvers and grills should be considered. Screens shall not be
of a mesh smaller than 1/4 inch square. If the free area is not known,
the latest edition of National Fuel Gas Code ANSI Z223.1 recommends
using figures of 20-25 percent free area for wood louvers or 60-75
percent for metal grills or louvers.

UNCONFINED SPACE

In buildings of conventional frame, brick or stone construction, unconfined
spaces may provide adequate air for combustion, ventilation, and dilution
air for power venter.

If the unconfined space is within a building of tight construction (building
using the following construction: weather stripping, heavy insulation,
caulking, vapor barrier, etc.), air for combustion, ventilation, and venter
dilution must be obtained from outdoors. The installation instructions for
confined spaces must be followed.

CONFINED SPACE

When drawing combustion and dilution air from inside a conventionally
constructed building to a confined space, such a space shall be provided
with two permanent openings. ONE WITHIN 12 INCHES OF THE
ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF THE ENCLOSURE
BOTTOM. Each opening shall have a free area of one square inch per
1000 Btuh of the total input of all appliances in the enclosure, but not
less than 100 square inches.

WATER CONNECTIONS

Refer to figure 12 for typical installation. A suitable pipe thread sealant
must be used to prevent leakage.

WATER (POTABLE) HEATING AND SP ACE

HEATING

1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.

2. T oxic chemicals, such as those used for boiler treatment, shall NEVER
be introduced into this system.

3. This unit may NEVER be connected to any existing heating system or
component(s) previously used with a non-potable water heating
appliance.

4. When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a tempering valve
must be installed. Please refer to Fig. 2 for suggested piping
arrangement.

5

SINGLE TEMPERA TURE

MIXING V AL VE APPLICATION FOR TWO TEMPERATURE W ATER

WARNING

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE A T FIXTURES. SEE TEMPERATURE REGULATION
ON PAGE 9. IF HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN
ANTI-SCALD VALVE FOR HOT WA TER SUPPLIED T O FIXTURES.

CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A". STORED
TEMPERATURE W ATER LOOP, IF USED, CONNECT TO COLD WATER INLET

CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW
PREVENTER, CHECK VA LVE OR WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF W ATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.

FIGURE 2

CLOSED WATER SYSTEM

A closed system will exist if a back-flow preventer (check valve),
pressure reducing valve, or other similar device is installed in the cold
water line between the water heater and the street main (or well).
Excessive pressure may develop due to the thermal expansion of heated
water causing premature tank failure or intermittent relief valve operation.
This type of failure is not covered by the limited warranty. An expansion
tank may be necessary in the cold water supply to alleviate this situation.
Contact the local plumbing authority.

If the temperature and pressure relief valve on the appliance discharges
periodically, this may be due to thermal expansion in a closed water
supply system. Contact the water supplier or local plumbing inspector
on how to correct situation. DO NOT PLUG THE TEMPERA TURE AND
PRESSURE RELIEF VAL VE.

RELIEF V AL VE

A NEW TEMPERATURE AND PRESSURE RELIEF V ALVE COMPL YING WITH
THE ST ANDARD FOR RELIEF VAL VES AND AUTOMATIC GAS SHUT OFF
DEVICES FOR HOT WA TER SUPPLY SYSTEMS, ANSI Z21.22 (LA TEST
EDITION) MUST BE INSTALLED IN THE HEA TER IN THE MARKED OPENING
PROVIDED. THE VAL VE MUST BE OF A SIZE (INPUT RA TING) THA T
WILL BE ADEQUATE FOR YOUR SIZE HEA TER.

Check the metal tag on the relief valve and compare it to the heater’s
rating plate. The pressure rating of relief valve must not exceed the
working pressure shown on the rating plate of the heater. In addition
the hourly Btu rated temperature steam discharge capacity of the relief
valve shall not be less than the input rating of the heater. NO V AL VE IS

TO BE PLACED BETWEEN THE RELIEF VAL VE AND T ANK. DO NOT PLUG
THE RELIEF VAL VE.

VENTING

WARNING

THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED
TO A VOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES.
SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND
ASPHYXIATION. NEVER OPERA TE THE HEATER UNLESS IT IS VENTED
TO THE OUTDOORS AND HAS ADEQUA TE AIR SUPPLY TO A VOID RISKS
OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIA TION.

VENT PIPE TERMINATION

The first step is to determine where the vent pipe will terminate. The
vent may terminate through the roof (see Figure 9) or through a sidewall
(see Figure 8).

IMPORTANT

The vent system must terminate so that proper clearances are maintained
as cited in local codes or the latest edition of the National Fuel Gas Code,
ANSI Z223.1, 7.3.4e and 7.8a, b.

For your convenience instructions on proper installation through a
sidewall are provide in Figure 3 and the numbered points below:

1. The exit terminals of a mechanical vent system shall be not less than
7 feet above grade when located adjacent to public walkways.

2. A venting system shall terminate at least 3 feet above any forced air
inlet located within 10 feet.

3. The venting system shall terminate at least 4 feet below, 4 feet
horizontally from or, 1 foot above any door, window or gravity air
inlet into any building.

The drain line connected to this valve must not contain a reducing coupling
or other restriction and must terminate near a suitable drain to prevent
water damage during valve operation. The discharge line shall be installed
in a manner to allow complete drainage of both the valve and line. DO

NOT THREAD, PLUG OR CAP THE END OF THE DRAIN LINE.

4. The manufacturer also recommends that the vent system termination
not be installed closer than 3 feet from an inside corner of an L shaped
structure and not be less than 1 foot above grade. The vent shall
terminate a minimum of 12'' above expected snowfall level to prevent
blockage of vent termination.

6

WARNING

VENT HOOD(S) MAY BE

EXTREMEL Y HOT

DURING OPERATION.

FIGURE 3

5. The vent termination shall not be mounted directly above or within 3
feet horizontally from an oil tank vent or gas meter to avoid potential
freeze-up from condensation.

Plan the vent system layout so that proper clearances are maintained
from plumbing and wiring.

Vent pipes serving power vented appliances are classified by building
codes as "vent connectors". Required clearances from combustible
materials must be provided in accordance with information in this manual
under LOCA TION OF HEATER and VENT TERMINAL INST ALLATIONS,
and with the National Fuel Gas Code and local codes.

PLANNING THE VENT SYSTEM

Plan the route of the vent system from the discharge of the blower to
the planned location of the vent terminal.

1. Layout the total vent system to use a minimum of vent pipe and elbows.
T ake into consideration that an elbow will be necessary to make the
first vent pipe connection to the power venter outlet (see Figure 6).

2. This water heater is capable of venting the flue gases the equivalent
of thirty (30) feet of 3 inch pipe or eighty-five (85) feet of 4 inch pipe
as listed in T able 1.

Number of 3" Maximum 4" Maximum
90° Elbows Pipe (Feet) Pipe Feet

ONE (1) 25 80

TWO (2) 20 75

THREE (3) 15 70

FOUR (4) 10 65

FIVE (5) - - - 60

3. The blower discharge adapter is made to accept only straight sections
of 3" pipe. T o start a minimum of 2 inches of 3" pipe must be glued
into the blower discharge (See figure 6).

If using 3 inch vent pipe:

A minimum of 2 inches, maximum of 4 feet of 3" pipe must be attached
to the blower before the first 3-inch elbow. After the first elbow add
the additional venting required for the installation. The total system
cannot exceed 30 equivalent feet of venting, where each elbow is
equal to 5 feet of straight pipe.

If using 4 inch vent pipe:

Two inches of 3" pipe must be attached to the blower discharge. A
4" x 3" reducer is added and then up to maximum 4 feet of 4 inch pipe
added before the first elbow. An additional 4" x 3" reducer and (1)
foot of 3" pipe must be added to the end of the vent system before
terminating into the 3" tee. The total system cannot exceed 85
equivalent feet of 4" venting, where each elbow is equal to 5 feet of
straight pipe.

NOTE: This unit can be vented using only PVC (Class 160,
ASTM D-2241; Schedule 40, ASTM D-1785; or Cellular Core Schedule
40 DWV , ASTM F-891), Schedule 40 CPVC/ASTM F-441), or ABS/ASTM
D-2661) pipe. The fittings, other than the
equivalent to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC fittings,
ASTM F-438 for CPVC pipe and ABS fittings. ASTM D-2661/331 1 for
ABS pipe. If CPVC or ABS pipe and fittings are used, then the proper
cement must be used for all joints, including joining the pipe to the
T ermination T ee (PVC Material).

TERMINATION TEE should be

TABLE 1

NOTE: The equivalent feet of pipe listed above are exclusive of the

"T ee" termination. That is, the first elbow and the termination "T ee",
with installed screens, are assumed to be in the system and the
remainder of the system must not exceed the thirty (30) equivalent
feet of 3 inch pipe or eighty five (85) equivalent feet of 4 inch pipe.

FIGURE 4

7

PVC Materials should use ASTM D-2564 Grade Cement; CPVC Materials
should use ASTM F-493 Grade Cement and ABS Materials should use
ASTM D-2235 Grade Cement.

NOTE: 1. For water heaters in locations with high ambient temperatures
(above 100°F) and/or insufficient dilution air , it is recommended that CPVC
or ABS pipe and fittings be used. 2. The SUPPLIED VENT TERMINAL
must be used in all cases.

4. The temperature of the flue gases leaving the blower is about 160°F
after mixing the dilution air in the inlet adapter of the blower. Even
with high concentrate of room air taken into the vent system for dilution

there will be some installations where condensate will be formed

air ,
in the horizontal runs of the vent system. This condensate MUST
NOT be allowed to drain back into the fan unit.

One method to catch the condensate before it can run back to the
fan is to install a "TEE" mounted upside down and capped, just past
the first elbow, (Fig.9) of the vent pipe system. This set-up will require
the installation of a small (1/4-3/8 inch) plastic tube, with the proper
trap, to drain the condensate to a floor drain.

A second method to prevent the condensate from draining back to
the fan unit would be to install the vent system with a slight, 1/8 inch
per five foot of pipe maximum, downward slope (max. of 5/8 inch).

INSTALLATION OF SIDEWALL VENT SYSTEM

Slide the pipe through the wall and insert into the coupling on the other
side of the wall, making sure that the vent terminal ends up pointed in the
correct position. (See fig. 5).

FIGURE 5

PREPARATION OF BLOWER ASSEMBLY

1. Check to make sure that the wire harness is attached to the gas
valve and blower control box.

2. Make sure no material is still attached to the outside or inside of blower
assembly .

Before beginning installation of piping system thoroughly read the section
of this manual VENT PIPE PREPAR ATION.

If you are installing your system so that it vents through roof, please
refer to following section titled INST ALLATION OF VERTICAL VENT
SYSTEM.

VENT TERMINAL INSTALLATION, SIDEWALL

1. Install the vent terminal by using the cover plate as a template to mark
the hole for the vent pipe to pass through the wall. BEWARE OF
CONCEALED WIRING AND PIPING INSIDE THE WALL.

2. If the Vent Terminal is being installed on the outside of a finished wall,
it may be easier to mark both the inside and outside wall. Align the
holes by drilling a hole through the center of the template from the
inside through to the outside. The template can now be positioned
on the outside wall using the drilled hole as a centering point for the
template.

3. A) MASONRY SIDE WALLS
Chisel an opening approximately one half inch larger than the marked
circle.

B) WOODEN SIDE WALLS
Drill a pilot hole approximately one quarter inch outside of the marked
circle. This pilot hole is used as a starting point for a saws-all or
sabre saw blade. Cut around the marked circle staying approximately
one quarter inch outside of the line. (This will allow the vent to easily
slide through the opening. The resulting gap will be covered up by
the Vent Terminal cover plate.) Repeat this step on inside wall if
necessary.

3. Make sure that plastic tubing is still attached to the pressure switch
and fan housing. Also make sure that wiring connector from motor
to control box is securely attached.

SEQUENCE OF INST ALLATIONS, FIGURE 4
Cut a length of 3" PVC pipe about 3.5 inches longer than the wall thickness

at the opening. Glue the vent terminal "TEE" with screens to this section
of pipe. Slide the wall plate over the pipe to stop against "TEE". Place a
bead of caulking (not supplied) around the gap between the pipe and
cover plate. Apply enough to fill some of the gap between the pipe and
wall. Place some of the caulking on the back of the plate to hold it against
the wall after installation. If the vent pipe is installed up to the wall, with
a coupling on the end against the wall opening, the pipe with the vent
terminal can be prepared for gluing before inserting through the wall.

FIGURE 6

4. Do not plug in power cord until vent system is completely installed.
The Power Vent operates on 120 V ac, therefore a grounded outlet
must be within reach of the 6 foot flexible power cord supplied with
the vent (see fig.1). The power cord supplied may be used on unit
only where local codes permit. If local codes do not permit use of
flexible power supply cord:

8

A. Remove two screws that secure side plate on control

box and remove plate.

F. Be certain that neutral and line connections are not

reversed when making these connections. (See Figure 7).

B. Cut flexible power cord on inside of control box, as close

to inside wall as possible.

C . If flexible cord and strain relief are removed, then

opening in box must be covered.

D . Remove plastic cap in top of control box and install

suitable conduit fitting in enclosure.

E. Splice field wiring into existing wiring using code

authorized method (wire nuts, etc).

CAUTION

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS
OPERATION. VERIFY PROPER OPERA TION AFTER SERVICING.

G . Replace side panel and secure with two screws.

5. The blower discharge adapter is made to accept only straight sections
of 3" pipe. T o start off with an elbow , a short section of the furnished
pipe, a minimum of 2 inches, must be cut and glued into the end of the
elbow that will mount on the discharge adapter (see fig. 6).

6. An 1/8 inch bead of high temperature silicone should be applied to
the circumference of the discharge adapter just before installing the
first section of pipe or elbow.

POWER VENT WIRING SCHEMATIC - FIGURE 7

9

INSTALLATION OF VENT SYSTEM, SIDEWALL

With the route of the venting system and selection of materials completed,
as discussed in section of this manual titled PLANNING THE VENT
SYSTEM, the through the wall vent terminal in place and the first section
of piping, up to first elbow, installed at the blower it is time to complete
the installation of the venting system for the sidewall installation.

1. Vent T ermination must extend a minimum of 12 inches above roof or
12 inches above the anticipated snow level to prevent blockage of
the vent termination.

2. The venting system shall terminate at least four (4) feet from or one
(1) foot above any gable, dormer or other roof structure with building
interior access; i.e., vent, window, etc.

Before completing the installation of the venting system be sure to read
the sections of this manual discussing the proper method of cutting and
cementing PVC pipe and fittings: VENT PIPE PREP ARATION.

It is recommended that the completion of the venting system start at the
blower assembly and run to the coupling on the inside wall of the vent
terminal, Figure 5.

The vent system piping should be supported every 5 feet of vertical run
and every 3 feet of horizontal run. All piping and fittings must be joined
by the proper procedures as described under: VENT PIPE PREPARA TION.

3. The venting system shall terminate three (3) feet above any forced
air inlet located within ten feet.

FIGURE 9

FIGURE 8

INSTALLATION OF VERTICAL VENT SYSTEM

This unit is approved for venting through the roof with only the vent
terminal that is included with the unit, see Figure 9. A proper flashing or
"BOOT" should be used to seal the pipe where it exits the roof. The total
vent system should not exceed the thirty (30) equivalent feet of 3 inch
pipe or sixty (60) equivalent feet of 4 inch pipe as listed in T able 1.

NOTE: The equivalent feet of pipe listed above are exclusive of the
"TEE" termination with installed screens.

Provide support for all pipe protruding through the roof. All piping should
be properly secured. The vent system piping should be supported every
5 feet of vertical run and every 3 feet of horizontal run. All piping and
fittings must be joined by the proper procedures as described under:
VENT PIPE PREPARA TION.

IMPORTANT

The vent system must terminate so that proper clearances are maintained
as cited in local codes or the latest edition of the National Fuel Gas Code,
ANSI Z223.1 and as listed below:

VENT PIPE PREPARATION

1. INITIAL PREPARA TION

A. Make sure the solvent cement you are planning to use is designed

for the specific application you are attempting.

B. Know the physical and chemical characteristics and limitations

of the PVC and CPVC piping materials that you are about to use.
C . Know the reputation of your manufacturer and their products.
D. Know your own qualifications or those of your contractor. The

solvent welding technique of joining PVC and CPVC pipe is a

specialized skill just as any other pipe fitting technique.
E. Closely supervise the installation and inspect the finished job

before start-up.
F. Contact the manufacturer, supplier, or competent consulting

agency if you have any questions about the application or

installation of PVC and CPVC pipe.
G . Take the time and effort to do a professional job. Shortcuts will

only cause you problems and delays in start-up. By far, the

majority of failures in PVC and CPVC systems are the result of

shortcuts and/or improper joining techniques.

2. SELECTION OF MATERIALS

• Cutting Device - Saw or Pipe Cutter

• Deburring T ool, Knife, File, or Beveling Machine (2" and
above)

• Brush - Pure Bristle

10

• Rag - Cotton (Not Synthetic)

• Primer and Cleaner

• Solvent Cement - PVC for PVC Components and CPVC for CPVC
Components

• Containers - Metal or Glass to hold Primer and Cement. Select the
type of PVC or CPVC materials to be used on the basis of their
application with respect to chemical resistance, pressure rating,
temperature characteristics,etc.

• Insertion T ool - Helpful for larger diameter pipe and fittings
(6" and above).

PRIMER

It is recommended that T etrahydrofuran (THF) be used to prepare the
surfaces of pipe and fittings for solvent welding. Do not use water,
rags, gasoline or any other substitutes for cleaning PVC or CPVC
Surfaces. A chemical cleaner such as MEK may be used.

CEMENT

The cement should be a bodied cement of approximately 500 to 1600
centipoise viscosity containing 10-20% (by weight) virgin PVC material
solvated with tetrahydrofuran (THF). Small quantities of dimethyl
formamide (DMF) may be included to act as a retarding agent to extend
curing time. Select the proper cement; Schedule 40 cement should be
used for Schedule 40 pipe. Never use all-purpose cements, commercial
glues and adhesives or ABS cement to join PVC or CPVC pipe and
fittings.

SAFETY PRECAUTION: PRIMERS AND CEMENTS ARE EXTREMELY
FLAMMABLE, AND MUST NOT BE STORED OR USED NEAR HEA T OR
OPEN FLAME. ALSO, USE ONLY IN A WELL-VENTILA TED AREA.

3. MAKING THE JOINT

A. Cutting

Pipe must be squarely cut to allow for the proper interfacing of the
pipe end and the fitting socket bottom. This can be accomplished
with a miter box saw or wheel type cutter. Wheel type cutters are
not generally recommended for larger diameters since they tend to
flare the corner of the pipe end. If this type of cutter is used, the flare
on the end must be completely removed.

C. Test dry fit of the joint

T apered fitting sockets are designed so that an interference fit should
occur when the pipe is inserted about 1/3 to 2/3 of the way into the
socket. Occasionally , when pipe fitting dimensions are at the tolerance
extremes, it will be possible to fully insert dry pipe to the bottom of
the fitting socket. When this happens, a sufficient quantity of cement
must be applied to the joint to fill the gap between the pipe and fitting.
The gap must be filled to obtain a strong, leak-free joint.

D. Inspection, cleaning, priming

Visually inspect the inside of the pipe and fitting sockets and remove
all dirt, grease or moisture with a clean dry rag. If wiping fails to
clean the surfaces, a chemical cleaner must be used. Check for
possible damage such as splits or cracks and replace if necessary .

Depth-of-entry mark

Marking the depth of entry is a way to check if the pipe has reached
the bottom of the fitting socket in step F. Measure the fitting depth
and mark this distance on the pipe O.D. Y ou may want to add several
inches to the distance and make a second mark as the primer and
cement will most likely destroy your first one.

Apply primer to the surface of the pipe and fitting socket with a natural
bristle brush (see chart). This process softens and prepares the
PVC or CPVC for the solvent cementing step. Move quickly and without
hesitation to the cementing procedure while the surfaces are still
wet with primer.

E. Application of solvent cement

• Apply the solvent cement evenly and quickly around the outside
of the pipe at a width a little greater than the depth of the fitting
socket.

• Apply a light coat of cement evenly around the inside of the fitting
socket. Avoid puddling.

• Apply a second coat of cement to the pipe end.

NOTE: Power saws should be specifically designed to cut
plastic pipe.

STEP A

B. Deburring

Use a knife, plastic pipe deburring tool, or file to remove burrs from
the end of small diameter pipe. Be sure to remove all burrs from around
the inside as well as the outside of the pipe. A slight chamfer (bevel)
of about 10°-15° should be added to the end to permit easier insertion
of the pipe into the end of the fitting. Failure to chamfer the edge of
the pipe may remove cement from the fitting socket, causing the joint
to leak.

STEP E

NOTE: Cans of cement and primer should be closed at all times when

not in use to prevent evaporation of chemicals and hardening of cement.
They are also very flammable and should be kept away from heat or
flame.

F. Joint assembly

Working quickly , insert the pipe into the fitting socket bottom and give
the pipe or fitting a 1/4" turn to evenly distribute the cement. Do not
continue to rotate the pipe after it has hit the bottom of the fitting
socket. A good joint will have sufficient cement to make a bead all
the way around the outside of the fitting hub. The fitting will have a
tendency to slide back while the cement is still wet so hold the joint
together for about 15 seconds.

STEP B

STEP F

11

G. Cleanup and joint movement

Remove all excess cement from around the pipe and fitting with a
dry cotton rag. This must be done while the cement is still soft.

The joint should not be disturbed immediately after the cementing
procedure, and sufficient time should be allowed for proper curing
of the joint. Exact drying time is difficult to predict because it depends
on variables such as temperature, humidity and cement integrity . For
more specific information, you should contact your solvent cement
manufacturer.

STEP G

GAS CONNECTIONS

The minimum gas supply pressure for input adjustment is 5.0" W.C. for
natural gas (11.0" W .C. for propane).

THE HEA TER IS NOT INTENDED FOR OPERATION A T HIGHER THAN 14"
WA TER COLUMN SUPPL Y PRESSURE. EXPOSURE TO HIGHER GAS
SUPPL Y PRESSURE MAY CAUSE DAMAGE TO THE CONTROL WHICH
COULD RESULT IN FIRE OR EXPLOSION. If overpressure has occurred
such as through improper testing of gas lines or emergency malfunction
of the supply system, the control must be checked for safe operation.
Make sure that the outside vents on the supply regulators and the safety
vent valves are protected against blockage. These are parts of the gas
supply system not the heater. Vent blockage may occur during ice
storms.

IT IS IMPORT ANT TO GUARD AGAINST CONTROL FOULING FROM
CONT AMINANTS IN THE GAS WA YS. SUCH FOULING MA Y CAUSE
IMPROPER OPERA TION, FIRE OR EXPLOSION.

All piping must comply with local codes and ordinances or with the
National Fuel Gas Code (ANSI Z223.1 NFPA-54) whichever applies.

REFER TO FIG. 12 FOR CONNECTION DET AILS. BEFORE ATT ACHING
THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.

CONNECTION OF GAS PIPE

1. When connecting gas pipe to unit, apply wrench to flange only. Note:
Do not use wrench on gas valve or gas valve bracket.

2. PERFORM THE GAS LEAK TEST ANY TIME WORK IS DONE ON A
GAS SYSTEM TO A VOID THE POSSIBILITY OF FIRE OR EXPLOSION
WITH PROPERTY DAMAGE PERSONAL INJURY OR LOSS OF LIFE.

The Gas Leak T est is performed as follows: Paint pipe connections
upstream of gas control with a rich soap and water solution to test
for leaks before operating main burner. Bubbles indicate gas leak.
T o stop leak, tighten pipe connections. After piping connections are
checked, see OPERATION section below . Once heater is operating
and main burner is on: paint pipe joints (including flanges), pilot gas
tubing connections and control inlet and outlet with rich soap and
water solution. Bubbles indicate gas leak. T o stop leak, tighten flange
screws, joints and pipe connections. Replace part if leak can't be
stopped.

DISCONNECT THE APPLIANCE AND ITS INDIVIDUAL SHUT OFF V ALVE
FROM THE GAS SUPPL Y PIPING SYSTEM DURING ANY SUPPL Y
PRESSURE TESTING EXCEEDING 1/2 PSI (3.5 kPa). GAS SUPPL Y LINE
MUST BE CAPPED WHEN DISCONNECTED FROM THE HEA TER. FOR

TEST PRESSURES A T 1/2 PSI (3.5 kPa) OR LESS, THE APPLIANCE NEED
NOT BE DISCONNECTED, BUT MUST BE ISOLA TED FROM THE SUPPLY
PRESSURE TEST BY CLOSING THE MAIN MANUAL GAS V ALVE.

BEFORE PLACING THE HEATER IN OPERA TION, CHECK FOR GAS
LEAKAGE. USE SOAP AND WA TER SOLUTION OR OTHER MATERIAL
ACCEPT ABLE FOR THIS PURPOSE. DO NOT USE MATCHES CANDLES,
FLAME OR OTHER SOURCES OF IGNITION TO LOCA TE GAS LEAKS.

OPERATION

WARNING

DO NOT A TTEMPT TO OPERATE W ATER HEA TER WITH COLD WA TER
INLET V ALVE CLOSED.

NEVER OPERA TE THE HEATER WITHOUT FIRST BEING CERT AIN IT IS
FILLED WITH WA TER AND A TEMPERATURE AND PRESSURE RELIEF
VA LVE IS INST ALLED IN THE RELIEF V ALVE OPENING OF THE HEA TER.

TO TRAP ANY DIRT OR FOREIGN MA TERIAL IN THE GAS SUPPLY LINE,
A DIRT LEG (SOMETIMES CALLED DRIP LEG) MUST BE INCORPORA TED
IN THE PIPING, FIG. 12. The dirt leg must be readily accessible. Install in

accordance with recommendations of serving gas supplier. Refer to
the latest edition of ANSI Z223.1.

T o prevent damage, care must be taken not to apply too much torque
when attaching gas supply pipe to thermostat gas inlet. The thermostat
inlet has a pad for use with a backup wrench.

Apply joint compounds (pipe dope) sparingly and only to the male threads
of pipe joints. Do not apply compound to the first two threads. Use
compounds resistant to the action of liquefied petroleum gases. Do not
use teflon tape on thermostat fittings.

TO OPERATE THE HEATER

1. Close the heater drain valve (Figure 1-T) by turning handle clockwise

.

2. Open a nearby hot water faucet to permit the air in the system to
escape.

3. Fully open the cold water inlet pipe valve (Figure 1-M) allowing the
heater and piping to be filled.

4. Close the hot water faucet as water starts to flow.

5. The heater is ready to be operated.

12

FOR YOUR SAFETY READ BEFORE OPERA TING

WARNING: If you do not follow these instructions exactly, a fire or explosion

may result causing property damage, personal injury or loss of life.

BEFORE OPERA TING: ENTIRE SYSTEM MUST BE FILLED WITH WA TER AND AIR PURGED FROM ALL LINES.

A. This appliance does not have a pilot. It is equipped with

an ignition device which automatically lights the burner.

DO NOT TRY TO LIGHT THE BURNER BY HAND.

• 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.

B. BEFORE OPERATING smell all around the appliance area

for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.

WHAT T O 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.

OPERA TING INSTRUCTIONS

1. STOP! Read the safety information above
on this label.

2. Turn the “ON/OFF” switch on the blower control box to

the “OFF” position.

C. Use only your hand to push in or turn the gas control

knob. Never use tools. If the knob will not push in or turn
by hand, don’t try to repair it, call a qualified service
technician. Force or attempted repair may result in a fire
or explosion.

D. Do not use this appliance if any part has been under

water. The heater must be replaced.

4. This appliance is equipped with a device which
automatically lights the burner.
DO NOT TRY TO LIGHT THE BURNER BY HAND.

5. Wait five (5) minutes to clear out any gas. If
you then smell gas, STOP! Follow "B" in the
safety information above on this label.
If you don't smell gas, go to the next step.

6. Set thermostat to desired setting.

7. Turn on all electrical power to the appliance.

8. If the appliance will not operate, follow the instructions
"TO TURN OFF GAS TO APPLIANCE" and call your
technician or gas supplier.

9. WA TER TEMPERATURE ADJUSTMENT
Turn temperature knob by hand to the desired
temperature.
Hot is approximately 120°F .

CAUTION: Hotter water increases the risk
of scald injury. Consult the instruction
manual before changing temperatures.

3. Set the thermostat to the lowest setting. Turn thermostat
dial fully counterclockwise

until it stops.

TO TURN OFF GAS TO APPLIANCE

A. Set thermostat to the lowest setting.
B. Turn off all the electric power to the appliance

if service is to be performed.

WARNING: TURN OFF ALL ELECTRIC
POWER BEFORE SERVICING

13

PURGING

Gas line purging is required with new piping or systems in which air has
entered.

CAUTION

PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED IN THIS
TYPE OF GAS SERVICE. TO AVOID RISK OF FIRE OR EXPLOSION,
PURGE DISCHARGE MUST NOT ENTER CONFINED AREAS OR SPACES
WHERE IGNITION CAN OCCUR. THE AREA MUST BE WELL VENTILATED

AND ALL SOURCES OF IGNITION MUST BE INACTIVA TED OR REMOVED.

CAUTION

THE "ON/OFF" SWITCH ON THE CONTROL BOX SHOULD NOT BE TURNED
TO THE "OFF" POSITION UNLESS THE UNIT IS BEING SERVICED.

TEMPERATURE REGULATION

DANGER

THIS WA TER HEATER IS EQUIPPED WITH AN ADJUST ABLE THERMOSTAT
TO CONTROL WA TER TEMPERA TURE. HOT WA TER TEMPERATURES
REQUIRED FOR AUTOMA TIC DISHWASHING AND LAUNDRY USE CAN
CAUSE P AINFUL SCALDING WITH POSSIBLE SERIOUS AND PERMANENT
INJURY . THE TEMPERA TURE AT WHICH INJURY OCCURS V ARIES WITH
THE PERSON’S AGE AND THE TIME OF THE EXPOSURE. THE SLOWER
RESPONSE TIME OF CHILDREN, AGED OR DISABLED PERSONS
INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN
TO USE A HOT WA TER T AP , OR TO DRA W THEIR OWN BATH W A TER.
NEVER LEA VE A CHILD OR DISABLED PERSON UNA TTENDED IN A
BA THTUB OR SHOWER.

THE WA TER HEATER SHOULD BE LOCA TED IN AN AREA WHERE THE
GENERAL PUBLIC DOES NOT HAVE ACCESS. IF A SUIT ABLE AREA IS
NOT AVAILABLE, A COVER SHOULD BE INSTALLED OVER THE
THERMOSTA T TO PREVENT T AMPERING. Suitable covers are available
through A.O. Smith Water Products Company , 5621 W . 115th Street, Alsip,
IL 60803.

It is recommended that lower water temperatures be used to avoid the
risk of scalding. It is further recommended, in all cases, that the water
temperature dial be set for the lowest temperature that satisfies your
hot water needs. This will also provide the most energy efficient
operation of the water heater. The water temperature adjusting dial
was factory set at the lowest temperature; all the way counterclockwise
to the mechanical stop. Turning the dial counterclockwise
temperature and clockwise

SETTING THE WA TER HEATER TEMPERA TURE AT 120°F (49°C) (APPROX.
"HOT" MARK ON FACE OF THE TEMPERA TURE ADJUSTING DIAL) WILL
REDUCE THE RISK OF SCALDS. Some states require settings at specific

lower temperatures.
Figure 10 shows the approximate water temperatures produced at

various thermostat dial settings. Short repeated heating cycles caused
by small hot water uses can cause temperatures at the point of use to
exceed the thermostat setting by up to 20°F (11°C). If you experience
this type of use you should consider using lower temperature settings
to reduce scald hazards.

increases temperature.

decreases

Valves for reducing point of use temperature by mixing cold and hot
water are available. Also available are inexpensive devices that attach
to faucets to limit hot water temperatures. Contact a licensed plumber or
the local plumbing authority.

WA TER TEMPERA TURE
ADJUSTING DIAL

Time to Produce 2nd & 3rd

Temperature Setting Degree Burns on Adult Skin

VERY HOT = APPROX.180°F (82°C) Almost Instantaneously

C = APPROX.162°F (72°C) About 1/2 Second

B = APPROX. 145°F (63°C) About 3 Seconds

A = APPROX. 130°F (54°C) More than 30 Seconds

HOT = APPROX.120°F (49°C) More than 5 Minutes

LOW = approx.80°F (27°C) No Hazard

FIGURE 10

MAINTENANCE

CAUTION

DISCONNECT FROM ELECTRICAL SUPPL Y BEFORE SERVICING UNIT .
FOR YOUR SAFETY , WA TER HEATER SERVICE SHOULD BE PERFORMED
ONLY BY A QUALIFIED SER VICE TECHNICIAN. READ THE GENERAL
SAFETY INFORMATION SECTION FIRST .

USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS
CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE INSPECTED
FOR PROPER OPERATION PERIODICALL Y BY A QUALIFIED SERVICE
TECHNICIAN.

MAIN BURNER

Check main burner every 12 months for proper flame characteristics.
This is done by removing door(s) on heater. The main burner should
provide complete combustion of gas; ignite rapidly; give reasonable quiet
operation; cause no excessive flame lifting from burner ports. Make
sure that the flow of combustion and ventilation air is not blocked.

If proper flame characteristics are not evident, check for accumulation
of lint or other foreign material that restricts or blocks the air openings in
the heater or burner. Also check AIR REQUIREMENTS.

WARNING

SOOT BUILD-UP INDICATES A PROBLEM THA T REQUIRES CORRECTION
BEFORE FURTHER USE. Consult with a qualified service technician.

Should the main burner or burner air openings require cleaning, turn the
control switch to “OFF” position and allow the burner to cool. Remove
the burner and clean with a soft brush. Clean main burner orifice with a
suitable soft material.

14

HIGH TEMPERATURE CUT-OFF SWITCH

The thermostat has a built-in temperature cut-off switch (TCO), which
will shut off gas to the burner in case of excessive water temperature.
If the TCO functions the valve will flash 4 times and the valve must be
replaced. It is important that a serviceman be called to determine the
reason for limit operation and thus avoid repeated thermostat resetting.
Lower the temperature adjustment dial setting on control.

VENTING SYSTEM

HAVE VENTING SYSTEM CHECKED EVERY SIX MONTHS FOR
OBSTRUCTIONS AND/OR DETERIORA TION IN VENT PIPING.

A. Insofar as is practical, close all doors, windows and air inlets to the

building. Turn on all exhaust fans (range hood, bathroom exhaust,
etc.) so they will operate at their maximum speed. Close fireplace
dampers.

B. Turn water temperature adjusting knob to full, counterclockwise and

open water faucet if necessary to keep burner in operation.

C. “CHECKING THE DRAFT.” Operate the water heater for several

minutes and check to see if it is venting properly by passing a lit
match or paper near the opening of the Air Supply Box. If the draft is
proper, the match flame will be drawn into the Air Supply Box (fig

11). If not, the combustion products will tend to extinguish the flame.
If an improper draft exists, do not operate the water heater until proper
adjustments or repairs are made to provide adequate draft through
the gas vent.

D . Next, turn on all other fuel burning appliances within the same room

so they will operate at their full input.
Repeat step C above.

4. The pressure switch part inside the power venter must be open and
free from deposits of soot, carbon, etc.

For safety and satisfactory operation it is recommended that the heater
be checked once a year by a competent service person.

T & P V ALVE

At least once a year, the temperature and pressure relief valve must be
checked to ensure that it is in operating condition. Lift the lever at the
top of the valve several times until the valve seats properly and operates
freely.

W ARNING

THE WA TER P ASSING OUT OF THE VAL VE DURING THIS CHECKING
OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND
DISCHARGE SAFEL Y TO PREVENT WA TER DAMAGE.

DRAINING

Periodically open the drain valve and allow the water to run until it flows
clean. This will help prevent sediment build-up in the tank.

It is normal for lime and scale deposits to form within the tank and on the
heat exchanger surfaces. Such deposits will not be removed by periodic
draining. It is necessary to chemically delime the affected parts in water
areas where such deposits are encountered. Contact your dealer or
plumber for deliming information.

If the heater is to be shut off and exposed to freezing temperatures, it
must be drained. Water, if left in the tank and allowed to freeze, will
damage the heater.

• Turn off the gas and cold water inlet valve to the heater.

• Open a nearby hot water faucet and the heater drain valve.

FIGURE 11

POWER VENTER MAINTENANCE

The BTF-75 must be inspected quarterly. Points of inspection are:

1. MOTOR - Motor must rotate freely. This is a sealed motor and no
oiling is required.

2. WHEEL - Wheel must be clean of soot, ash or any other coating
whichinhibits either rotation or air flow. Remove all foreign material
from vent system before operating.

3. AIR SUPPLY BOX-Every month check operation and make sure nothing
is blocking dilution air entrance.

• BE CAREFUL TO GRASP THE DRAIN VAL VE HANDLE SO THA T THE
HAND IS NOT EXPOSED TO HOT W ATER. IF DESIRED, A HOSE MA Y
BE CONNECTED TO THE DRAIN V AL VE TO CARRY THE WA TER

AWAY.

WARNING: The water CAN BE HOT.

The drain valve must be left open during the shutdown period.

• T o restart heater, refer to the instructions under OPERATION.

MAIN BURNER AND IGNITER

Check main burner (figure 12) at least every 6 months for proper flame
characteristics. The main burner should display the following
characteristics:

1. Provide complete combustion of gas.

2. Cause rapid ignition and carryover of flame across entire burner.

3. Give reasonably quiet operation during ignition, burning and extinction.

4. Cause no excessive lifting of flames from burner ports.

If preceding burner characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or blocks the
air openings to the heater or burner.

W ARNING

SOOT BUILD-UP INDICATES A PROBLEM THA T REQUIRES CORRECTION
BEFORE FURTHER USE. CONSUL T WITH A QUALIFIED SERVICE
TECHNICIAN.

15

Should the main burner or burner air openings require cleaning, remove
the burner and clean with a soft brush. Clean main burner orifice with a
suitable soft material.

CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILA TING AIR TO
THE UNIT . MAINTAIN A CLEAR OPEN AREA AROUND THE HEA TER A T
ALL TIMES. DO NOT STORE COMBUSTIBLES OR FLAMMABLE LIQUIDS
NEAR OR AROUND AN APPLIANCE.

or, going to our website at: www.hotwater.com
Please click on: "Mail",
then click on: "Service"
and leave us a message.

Please be sure to provide the following information when writing or
e-mailing:

• Model Number

• Serial Number

IGNITER MAIN BURNER

FIGURE 12 - MAIN BURNER AND IGNITER ASSEMBL Y

CONDENSATION

Water vapor can condense on the cooler surfaces of the tank forming
droplets, these drip into the fire or run out on the floor. This is common
at the time of startup after installation, during periods of time when
incoming water is very cold, or the heater may be undersized for the
requirements.

Droplets from the bottom of the flue may be due to corrosive combustion
products or improper vent. Check with your dealer for more information.

CATHODIC PROTECTION-ANODE

The anode rod within the tank is designed to be slowly consumed
cathodically, minimizing corrosion in the glass lined tank. A hydrogen
sulfide (rotten egg) odor may result if water contains high sulfate and/or
minerals. Chlorinating the water supply should minimize the problem.
(See EXTENDED NON-USE PERIODS).

• Date of Original Purchase

• Date Problem Originated

• Explanation of Problem
Also, please be sure to include a daytime telephone number.

TROUBLE SHOOTING

Water heater may exhibit problems that are unrelated to a malfunction of
the water heater itself. The following information and tables may serve
to answer your question about a problem that you are having without
having to call a service agent.

For your safety, water heater service should be performed only by a
qualified service technician. Read the GENERAL SAFETY INFORMATION
section first.

WATER HEATING CYCLE

(GAS AND ELECTRIC POWER ARE ON, “OFF/ON” SWITCH IS ON)

1) SMARTVALVE
A) THERMOST AT SENSES NEED FOR HEA TING WA TER
B) CONTACTS CLOSE IN THERMOST A T , POWER (1 15 VAC)

FLOWS TO BLOWER MOTOR

®

(1) CALLS FOR HEAT (SEE FIGURES 7 &12)

NOTE: Anode must remain installed (except for inspection) to avoid
shortening tank life. See LIMITED WARRANTY. Replace as necessary.

SERVICE AND REPAIR

The A.O. Smith water heater requires no special care other than the
normal maintenance as noted above. If you are having a problem with
your water heater, before calling for service please refer to the following
TROUBLESHOOTING sections. If service becomes necessary , contact
your dealer, installer or an authorized service agent. Do not attempt to
repair the water heater yourself. Any work performed by unauthorized
personnel may void the warranty .

If you are having a problem with your A.O. Smith water heater and are
not pleased with the service you received:

• First, please contact your dealer or the A.O. Smith authorized service
agent in your area and explain to them why you are not satisfied.
This will usually correct the problem.

• If after working with your dealer or service agent the problem has
not been resolved to your satisfaction, please let us know by either
writing to us at:

A.O. Smith Water Products Company
Service Department
600 East John Carpenter Freeway
Rochelle Park, Suite 200
Irving, TX 75038

2) BLOWER MOTOR ROT ATES BLOWER WHEEL
A) BLOWER WHEEL SPEED INCREASES
B) WHEEL SPEED INCREASES, AIR PRESSURE SWITCH

CONT ACTS CLOSE

3) 120 VAC FLOWS TO HOT SURF ACE IGNITER

NOTE: THE CONTROL MODULE ON THIS UNIT WILL TRY A MAXIMUM OF
THREE TIMES TO LIGHT THE UNIT . CYCLE CAN BE RESTAR TED AT ANY
TIME BY TURNING OFF SWITCH AND THEN TURNING BACK ON. IF UNIT
HAS GONE THROUGH THREE CYCLES AND DID NOT LIGHT , THEN
REP AIRMAN SHOULD BE CALLED TO CHECK OPERATION OF HEA TER.

4) MAIN BURNER IGNITES
A) GAS FLOWS TO MAIN BURNER PORTS AND IS IGNITED

5) GAS VAL VE SENSES BURNER FLAME

6) BURNER HEATS W ATER
A) BURNER HEA TS WATER T O THERMOSTA T SETTING
B) CONT ACTS IN THERMOSTA T OPEN,
C) CYCLE IS COMPLETED

16

WARNING: DO NOT BY-P ASS ANY CONTROLS TO MAKE HEA TER OPERATE. OPERA TE ONL Y AS WIRED FROM FACT ORY .

TROUBLESHOOTING

For your safety , water heater service should be performed only by a qualified service technician.

Read the GENERAL SAFETY INFORMATION section first.

PROBLEM POSSIBLE MALFUNCTION SERVICE TO BE PERFORMED

1) Blower will not run

NOT ENOUGH OR

NO HOT WA TER

VENT PIPE TOO HOT

(ABOVE 170° F)

YELLOW FLAME

CONDENSA TION

WA TER LEAKS

LEAKING T&P VALVE

HOT WATER ODORS OR COLOR
(Refer to CATHODIC PROTECTION)

A ) “ON/OFF” control switch turned off
B) Blower unplugged
C) No power at outlet
D) “ON/OFF” switch defective
E) Control harness defective
F) Blower motor defective

2) Blower running, burner not on
A ) Fan not running fast enough to close

air switch contacts

B) Air pressure switch defective
C) Gas valve defective
D) Control harness defective
E) Igniter defective
F) Unit has completed three trials to light

and failed

G) Discharge air limit tripped

3) Thermostat problems
A ) Thermostat set too low
B) Thermostat or ECO defective
C) High limit control circuit open

4) Others
A ) Heater undersized
B) Low gas pressure
C) Incoming water is unusually cold
D) Leaking hot water pipes or fixtures
A ) Blower does not run when heater fired

B) Not enough dilution air to mix with flue

gases in “Tee”

C) Air in room too hot for mixing with flue gases

D) Wrong burner orifice
A ) Dirt in burner ports
B) Combustion air path restricted

C) Not enough room air for proper combustion

A ) Water on the floor under heater
B) Water dripping from fan

Improperly sealed, hot or cold supply connections,
relief valve, drain valve or thermostat threads
Leakage from other appliances or water lines
Condensation of flue products
Thermal expansion in closed water system
Improperly seated valve
High sulfate or mineral content in water supply or
iron or sulfate reducing bacteria in water supply

Turn switch to the “ON” position.
Plug blower back into 115 vac. outlet.
Repair service to outlet.
Replace switch.
Replace control harness.
Replace blower and motor.
Replace switch.
Check for low voltage, less than 102 vac., have service
checked and repaired.
If voltage is above 102 vac., make sure there is not more than
30 Equivalent feet of 3 inch pipe or 85 equivalent feet of 4 inch
pipe installed or vent terminal blockage.
If at least 102 vac., less than 30 equivalent feet of 3 inch pipe
or 85 equivalent feet of 4 inch pipe and not terminal blockage,
replace blower.
Replace switch.
Replace gas valve.
Replace harness.
Replace igniter.
Reset cycle by turning switch off and then back on. If unit
does not light in three trials, call an authorized A.O. Smith
service representative.
Verify dilution air openings are free of obstructions.
Make sure there is no more than 30 equivalent feet of 3 inch pipe or
85 equivalent feet of 4 inch pipe.
Check for low voltage, less than 102 vac., have service
checked and repaired.
Make sure vent terminal is not blocked.

Turn temperature control higher.
Replace thermostat.
Replace.

Reduce hot water use.
Contact an authorized A.O. Smith service representative.
Allow more time for heater to re-heat.
Have plumber check and repair leaks.
Take unit out of service immediately, call an authorized A.O.
Smith service representative.
Proper air circulation must be provided for combustion and
dilution of flue temp. Refer to “INSTALLATION” section.
Room air to be used for dilution with combustion products in
flue should be less than 90°F.
Install correct orifice.
Turn off heater and gas, clean burner head.
Clear area around heater and check under heater, remove
any debris under heater and in openings in bottom cover.
Refer to installation manual - Confined and Unconfined Space
statements on page 4 and 5 for required openings.
See “CONDENSATION.”
Provide drip “TEE” to catch condensation, refer to pages 8 and 10.
Turn off heater & water, repair unit.

Inspect other appliances near water heater.
Refer to “CONDENSATION.”
Install thermal expansion tank (DO NOT plug T&P valve).
Check relief valve for proper operation (DO NOT plug T&P valve).
Drain and flush heater thoroughly, chlorinate, refill and flush
again then chlorinate water supply.

17

TROUBLESHOOTING WITH THE LED

LED STATUS INDICATES CHECK/REPAIR

OFF

No power to system control.

1. Appliance On/Off switch in the Off position.

2. Line voltage input power at L1 and L2 connectors.

3. System wiring harness in good condition and securely
connected at both ends.

BRITE - DM

1 FLASH

2 FLASHES

3 FLASHES

Normal Operation

This indication shows whenever the system is
powered, unless some abnormal event has occurred.

Setpoint error, internal failure detected.

Airflow proving switch remains open longer than
30 seconds after a call for heat begins.

Combustion air blower is not energized
until airflow proving switch opens.

Airflow proving switch remains open longer than
30 seconds after combustion air blower energized.

System goes into 5 minute delay period, with
combustion air blower off. At the end of the
5 minute delay, another ignition cycle will begin.

Not Applicable.

1. Replace control.

1. Airflow proving switch stuck closed.

2. Airflow proving switch mis-wired or jumpered.

WARNING
Line Voltage Hazard.

Can cause property damage, severe injury or
death.

Turn off appliance before coming in contact with
pressure switch and/or electrical connections.

1. Airflow proving switch operation, tubing and wiring.

2. Obstructions or restrictions in appliance air intake
or exhaust flue system that prevent proper combustion
air flow.

WARNING
Line Voltage Hazard.

Can cause property damage, severe injury or
death.

Turn off appliance before coming in contact with
pressure switch and/or electrical connections.

4 FLASHES

5 FLASHES

6 FLASHES

Thermal Cutoff open.

Combustion air blower is energized.

Internal hardware failure.

Flame signal sensed out of proper sequence.

Combustion air blower is energized.

System Lockout.

After 1 hour lockout reset delay, control will reset
and initiate a new ignition sequence if the call for
heat is still present.

1. Replace Control.

1. Flame at main burner.

2. Replace control.

1. Gas supply off or at too low pressure to operate.

2. Damaged or broken HSI element.

3. Appliance not properly earth grounded.

4. Flame sense rod contaminated or in incorrect location.

5. HSI element located incorrect position.

6. HSI element or flame sense rod wiring in good
condition and properly connected.

7. Less than 100 Vac between flame rod and burner
pan with 120 Vac input to control.

8. Cycle external power or remove request for heat for
2 seconds and reapply.

18

SV9560/SV9570 SMARTV ALVE® WATER HEATER CONTROL

START

l

CHECK FOR PROPER VOLT AGE A T
CONTROL HARNESS (SEE INSET A).
VOLT AGE SHOULD BE 120V
BETWEEN 120V COMMON AND
120V HOT .

YES

TURN ON GAS SUPPLY PLUG
HARNESS INTO SmartV alve
CONTROL. INITIATE A REQUEST
FOR HEAT. COMBUSTION BLOWER
SHOULD BE ON AND PREPURGED.

IGNITER WARMS UP AND
GLOWS RED.

®

TROUBLESHOOTING GUIDE

NOTE: BEFORE TROUBLESHOOTING
BECOME FAMILIAR WITH THE STARTUP
AND CHECKOUT PROCEDURE.

CHECK:

• LINE VOLT AGE POWER

• WIRING

WARNING

1

NO

NO

NO

Line Voltage Hazard.
Can cause property damage,

severe injury or death.

Only a trained, experienced service
technician should perform this trouble­shooting. Be certain to avoid contact
with pressure switch and/or electrical
connections.

CHECK:

• IS AIR PROOFING SWITCH STUCK

OR CLOSED.

• IS THE FLUE BLOCKED.

• IS THE WIRING CONNECTED

PROPERLY T O THE SWITCH AND
COMBUSTION BLOWER.

WITH IGNITER CABLE CONNECTED,
MEASURE VOLT AGE A T HSI ELEMENT
OUTPUT (SEE INSET B) 120V NOMINAL
CHECK DAMAGED OR BROKEN HSI
ELEMENT .

WARNING

Line Voltage Hazard.
Can cause property damage,

severe injury or death.

Only a trained, experienced service
technician should perform this trouble­shooting. Be certain to avoid contact
with pressure switch and/or electrical
connections.

NO

REPLACE SmartV alve® CONTROL

MAIN VALVE OPENS AND MAIN
BURNER LIGHTS.

SYSTEM IS OKAY.

1

WHEN MEASURING VOLT AGE
AT CONNECTIONS, USE CARE
TO ASSURE TERMINALS ARE
NOT DAMAGED.

YES

REPLACE HSI

CHECK:

• IS THE APPLIANCE EARTH GROUNDED

(120V BETWEEN HOT AND CHASSIS

NO

GROUND).

• IS GAS SUPPLY OFF OR TOO LOW

PRESSURE TO OPERATE THE
CONTROL.

• DOES BURNER FLAME MAKE GOOD

CONT ACT WITH THE FLAME ROD.

• IS FLAME SENSE ROD CONTAMINATED

OR IN AN INCORRECT LOCATION.

• IS THERE APPROXIMATEL Y 100 V A V

BETWEEN FLAME ROD AND BURNER
PAN WITH 120V AC INPUT T O
CONTROL.

• IF ALL OF THE ABOVE ARE GOOD,

REPLACE IGNITER AND FLAME ROD
ASSEMBLY.

CYCLE THERMOSTA T OFF AND BACK ON

MAIN BURNER LIGHTS

19

1

NO

REPLACE SmartV alve® CONTROL

Model BTF-75 Limited Warranty

A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.

1. THE TANK
If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable
water therein, during the first THREE years after initial installation, the warrantor will supply a complete new A. O. Smith water heater of
equivalent size and current model. Some government agencies are requiring energy efficient standards for water heaters. In the event
regulations prohibit sale of a model of equivalent size and construction, A. O. Smith will provide a model which complies with the regulations
of your area, in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model
required. The warranty on the replacement water heater will be limited to the unexpired term of the original warranty.

2. ALL OTHER PARTS
If within ONE year after initial installation of this water heater, any part or portion shall prove upon examination by the warrantor to be defective
in material or workmanship, the warrantor will repair or replace such part or portion at its option.

3. CONDITIONS AND EXCEPTIONS
This warranty shall apply only when the water heater is installed in accordance with local plumbing and building codes, ordinances and
regulations, the printed instructions provided with it and good industry practices. In addition, a temperature and pressure relief valve, certified
by and officially sanctioned and recognized independent testing agency and approved by the American Society of Mechanical Engineers,
must have been installed.
a. This warranty shall apply only when the heater is used:

(1 ) at temperatures not exceeding the maximum setting of the thermostat;
(2 ) at water pressure not exceeding the working pressure shown on the heater;
(3 ) when filled with potable water free to circulate at all times;
(4 ) in a non-corrosive and non-contaminated atmosphere;
(5 ) with factory approved anode(s) installed;
(6) in it's original installation location;

(7 ) in the United States, its territories or possessions, and Canada.
b. Any accident to the water heater, any misuse, abuse (including freezing or thermal expansion damage) or alteration of, any operation in
a modified form, or any attempt to repair tank leaks will void this warranty.
c. This warranty is void if a device acting as a backflow prevention device (check valves etc.) is installed in the cold water supply the

heater is connected to, unless an effective method of controlling thermal expansion is also installed at the heater(s) and operational at all

times. The relief valve installed on the heater is not an acceptable method.

4. SERVICE AND REP AIR EXPENSES
Under the limited warranty the warrantor will provide only a replacement water heater or part thereof. The owner is responsible for all other

costs. Such costs may include but are not limited to:
a. Labor charges for service removal, repair or reinstallation of the water heater or any component part;
b. Shipping, delivery, handling, and administrative charges for forwarding the new heater or replacement part from the nearest distributor

and returning the claimed defective heater or part to such distributor.

c. All cost necessary or incidental for any material and/or permits required for installation of the replacement heater or part.

5. LIMITA TIONS ON IMPLIED WARRANTIES

Implied warranties, including the warranty of merchantability imposed on the sale of this heater under state law are limited to one (1) year
duration for the heater or any of its parts. Some states do not allow limitation on how long an implied warranty lasts, so the above limitation
may not apply to you.

6. CLAIM PROCEDURE

Any claim under the warranty should be initiated with the dealer who sold the heater, or with any other dealer handling the warrantor’s
products. If this is not practicable, the owner should contact:

a. The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or distributed

by the warrantor.

b. Dealer replacements are made subject to in-warranty validation by warrantor.

7. DISCLAIMERS

NO OTHER EXPRESS WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF OF THE WARRANT OR WITH RESPECT TO THE HEA TER OR THE
INSTALLA TION, OPERA TION, REP AIR OR REPLACEMENT OF THE HEA TER. THE WARRANT OR SHALL NOT BE RESPONSIBLE FOR WA TER
DAMAGE, LOSS OF USE OF THE UNIT , INCONVENIENCE, LOSS OR DAMAGE TO PERSONAL PROPERTY OR OTHER CONSEQUENTIAL DAM­AGE. THE WARRANTOR SHALL NOT BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHER WISE FOR DAMAGE TO ANY PERSONS OR
PROPERTY , WHETHER DIRECT OR INDIRECT , AND WHETHER ARISING IN CONTRACT OR IN TOR T .
a. Some states do not allow the exclusion or limitation of the incidental or consequential damage, so the above limitations or exclusions may

not apply to you.

b. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and serial number are found on the
heater’s rating plate.

Model No. ____________________Serial No. ____________________________________________Date Installed________________________
Dealer’s Name________________________________________________________________________________________________________
Dealer’s Address _____________________________________________________________________Phone No.________________________
City and State _______________________________________________________________________Zip ______________________________

U.S. Customers Canadian Customers
A. O. Smith Water Products Company A. O. Smith Enterprises Ltd.
5621 West 115th Street P. O. Box, 310 - 768 Erie Street
Alsip, IL 60803 Stratford, Ontario N5A 6T3
Telephone: [phone] Telephone: [phone]

KEEP THIS WARRANTY POSTED ADJACENT TO THE HEATER FOR FUTURE REFERENCE.

20