A.O. Smith 184769-000 User Manual

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RESIDENTIAL

GAS WATER HEATER

 

OWNER'S MANUAL

 

 

 

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

You should thoroughly read this manual before installation and/or operation of this water heater. Please pay particular attention to the important safety and operating instructions as well as the WARNINGS and CAUTIONS.

GAS

TABLE OF CONTENTS

 

PAGE

GET TO KNOW YOUR WATER HEATER

2

GENERAL SAFETY INFORMATION

3

INSTALLATION

4 -6

OPERATION

6 -8

MAINTENANCE AND

 

TROUBLESHOOTING

8 -10

WARRANTY

11

 

 

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONTAINS

INFORMATION RELATIVE TO YOUR SAFETY. PLEASE

READ THOROUGHLY BEFORE INSTALLING AND

USING THIS APPLIANCE.

A DIVISION OF A.O. SMITH CORPORATION

www.aosmithwaterheaters.com

KEEPTHIS MANUALIN THE POCKET ON HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

PRINTED IN U.S.A. 0104

PART NO. 184769-000

1

GET TO KNOW YOUR WATER HEATER

REPLACEMENT PARTS AND DELIMING PRODUCTS

Replacement parts and recommended delimer may be ordered through authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact A.O. Smith Water Products Company, 5621 W. 115th Street, Alsip, Illinois 60803, 1-800-433-2545.When ordering parts, provide complete model and serial numbers (see rating plate), quantity and name of part desired (as listed in Figure 1). Standards hardware items may be purchased locally.

*INSTALL IN ACCORDANCE WITH LOCAL CODES.

(A)

VENTPIPE

(N)

UNION

(B)

DRAFT HOOD

O)

INLETWATER SHUT OFF

(C)

ANODE

 

VALVE

(D)

HOT WATER

(P)

COLD WATER INLET

 

OUTLET

(Q)

INLETDIPTUBE

(E)

OUTLET

(R)

TEMPERATUREAND

(F)

INSULATION

 

PRESSURE RELIEF VALVE

(G)

GAS SUPPLY

(S)

RATING PLATE

(H)

MANUAL GAS SHUT

(T)

FLUE BAFFLE

 

OFF VALVE

(U)

THERMOSTAT

(J)

GROUND JOINT UNION

(V)

DRAIN VALVE

(K)

DIRT LEG

(W)

PILOT AND MAIN BURNER

(L)

INNER DOOR

(X)

FLUE

(M)

OUTER DOOR

(Y)

DRAIN PAN

(U) THERMOSTAT

CERTAIN MODELS ARE

EQUIPPED WITH SIDE

PLUMBING CONNECTIONS

FOR SPACE HEATING. THE

HOT AND COLD FITTING

ASSEMBLIES (PART #900126-2).

(W) PILOT & MAIN BURNER

GAS MODELS

FIGURE 1

2

GENERAL SAFETY

INFORMATION

EXTERNAL DAMAGE

The design of this gas-firedwater heater complies with the latest version of ANSIZ21.10.1/CSA4.1 or ANSIZ21.10.3/CSA4.3 as a automatic storage type water heater.

Do not operate the water heater until it has been fully checked out by a qualified technician, if the water heater:

Has been exposed to fire or damage.

Displays evidence of sooting.

Produces steam or unusually hot water.

If the water heater has been flooded it must be replaced.

CHEMICAL VAPOR CORROSION

WARNING

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN FAILURE 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. Water heater failure due to a corrosive atmosphere is not covered by the limited warranty.

IMPROPER COMBUSTION

WARNING

ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE POISONING AND DEATH.

OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE DRAFT IN THE AREA OF THE WATER HEATER PREVENTING THE PRODUCTS OF COMBUSTION FROM EXHAUSTING THROUGH THE CHIMNEY OR 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-draftcondition does not exist.

DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.

LIQUID PETROLEUM MODELS

Water heaters for propane or liquefied petroleum gas (LPG) are different 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 difficult to detect at nose level. If LP gas is present or even

3

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.

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

EXTENDED NON-USEPERIODS

WARNING

HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN 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 AT THE TIME IT IS OPEN.

INSULATION BLANKETS

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. Your A. O. Smith water heater meets or 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 (See Figure 1 for identification of components mentioned below). 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 apply insulation to the top of the water heater, as this will interfere with safe operation of the draft hood.

Do not cover the outer door, thermostat or temperature & pressure relief valve.

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.

INSTALLATION

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING AND GAS SUPPLY ARE REQUIRED.

GENERAL

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 code is available from the Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131.

LOCATION OF HEATER

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

The heater is design certified for installation on combustible flooring in a closet having minimum clearances from combustible material of: 1" clearance from sides and rear, 4" from the front and 18" 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.

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.

CAUTION

In cold climates provide protection against freeze-up.THE HEATER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE OF THE TANK OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE AREA ADJACENT TO THE HEATER 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. 115th Street, Alsip, Illinois 60803.

WARNING

DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A CARPETED FLOOR. A FIRE HAZARD MAY RESULT. 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. Also, see the drain requirements.

WARNING

For California installation this water heater must be braced, anchored, or strapped to avoid falling or moving during an earthquake. See instructions for correct installation procedures. Instructions may be obtained from your local dealer, wholesaler, public utilities or California's Office of the State Architect, 400 P Street, Sacramento, CA 95814.

AIR REQUIREMENTS

WARNING

FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN AIR CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH A CONDITION OFTEN WILL RESULT IN AYELLOW, LUMINOUS BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS, AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION.

Where an exhaust fan is supplied in the same room with a heater, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. SOOTING MAY RESULT IN SERIOUS DAMAGE TO THE HEATERAND RISK OF FIRE OR EXPLOSION.

DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR VENTILATINGAIR.

REFER TO THE LATEST EDITION OF THE “NATIONAL FUEL GAS CODE” ANSI Z223.1/NFPA 54.

Vapors from flammable liquids may explode and catch fire causing death or severe burns.

Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the water heater.

Keep flammable products:

1.far away from heater,

2.in approved containers,

3.tightly closed and

4.out of children’s reach.

Installation:

Do not install water heater where flammable products will be stored or used unless the main burner and pilot flames are

Water heater has a main burner and pilot flame.

The pilot flame:

1.is on all the time and

2.will ignite flammable vapors.

Vapors:

1.Cannot be seen,

2.are heavier than air,

3.go along way on the floor and

4.can be carried from other rooms to the pilot flame by air currents.

at least 18" above the floor. This will reduce, but not eliminate, the risk of vapors being ignited by the main burner or pilot flame.

4

UNCONFINED SPACE

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

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 draft hood 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 IN OR WITHIN 12 INCHES OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh of the total input of all appliances in the enclosure, but not less than 100 square inches.

If the confined space is within a building of tight construction, air for combustion, ventilation and draft hood 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.

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 20-25percent free area for wood louvers or60-75percent for metal grills or louvers.

WATER CONNECTIONS

Refer to figure 1 for typical installation. A suitable pipe thread sealant must be used to prevent leakage.

WATER (POTABLE) HEATINGAND SPACE HEATING

For WATER HEATING (POTABLE) and SPACE HEATING:

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

2.Toxic 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-potablewater 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

FIGURE 2

CLOSED WATER SYSTEM

A closed system will exist if a back-flowpreventer (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, see fig. 1. 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 this situation. Do not plug the temperature and pressure relief valve.

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 HEATER IS NOT INTENDED FOR OPERATIONAT HIGHER THAN 10.5"-NATURAL,13.0"-PROPANEWATER COLUMN (1/2 POUND PER SQUARE INCH [3.5 kPa]) SUPPLY PRESSURE. EXPOSURE TO HIGHER GAS SUPPLY 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 IMPORTANT TO GUARD AGAINST CONTROL FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, 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. Copper and brass tubing and fittings (except tin lined copper tubing) shall not be used.

REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.

TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG) MUST BE INCORPORATED IN THE PIPING, FIG. 1. 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.

To 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.

DISCONNECT THE APPLIANCE AND ITS INDIVIDUAL SHUT OFF VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSI (3.5 kPa). GAS SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED FROM THE HEATER. FOR TEST PRESSURES AT 1/2 PSI (3.5 kPa) OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MAIN MANUAL GAS VALVE.

BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. USE SOAPAND WATER SOLUTION OR OTHER MATERIALACCEPTABLE FOR THIS PURPOSE. DO NOT USE MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION TO LOCATE GAS LEAKS.

DRAFT HOOD

THE DRAFT HOOD INCLUDED WITH THE HEATER MUST BE INSTALLED PROPERLY FOR SAFE OPERATION.

Locate draft hood as seen in figure 1. Position draft hood over the flue tube. Align the draft hood legs with the four holes surrounding the flue. Insert tabbed end of legs into the corresponding holes and twist to lock the draft hood in place.

When installing vent piping, secure the vent pipe to the draft hood using at least three sheet metal screws in the draft hood outlet.

VENTING

THE HEATER WITH DRAFT HOOD INSTALLED AS SHOWN IN FIG. 1 MUST BE CONNECTED TO A CHIMNEY OR GAS VENT. The vent pipe from the heater to the chimney must not be smaller than the outlet of the draft hood on the heater and should slope upward to the chimney at least 1/4 inch per foot. Do not extend vent pipe beyond the inside wall of the chimney.

For proper venting in certain installations, a field installed increased size vent connector and pipe size may be needed. Consult vent tables in the latest edition of the National Fuel Gas Code ANSI Z 223.1

WARNING

NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS AND HASADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIATION.

RELIEF VALVE - FIG. 1

A NEW TEMPERATURE AND PRESSURE RELIEF VALVE COMPLYING WITH THE STANDARD FOR RELIEF VALVESAND AUTOMATIC GAS SHUT OFF DEVICES FOR HOT WATER SUPPLY SYSTEMS, ANSI Z21.22 (LATEST EDITION) MUST BE INSTALLED IN THE HEATER IN THE MARKED OPENING PROVIDED. THE VALVE MUST BE OF A SIZE (INPUT RATING) THAT WILL BE ADEQUATE FOR YOUR SIZE HEATER.

Check the metal tag on the relief valve and compare it to the heater’s rating plate. The pressure rating of the 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 VALVE IS TO BE PLACED BETWEEN THE RELIEF VALVE AND TANK. DO NOT PLUG THE RELIEF VALVE.

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.

PIPE INSULATION - INSTALLATION

(SELECTED MODELS)

1.Remove pipe insulation from carton.

2.Fit pipe insulation over the incoming cold water line and the hot water line. Make sure that the insulation is against top cover of heater.

FIGURE3

OPERATION

NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE HEATER WITH COLD WATER INLET VALVE CLOSED.

FILLING

1.Close the heater drain valve by turning handle clockwise, Fig. 1.

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 allowing the heater and piping to be filled, Fig. 1.

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

5.The heater is ready to be operated.

6

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

A.This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.

B.BEFORE LIGHTING 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 TO DO IF YOU SMELL GAS:

Do not try to light any appliance.

Do not touch any electric switch;

do not use any phone in your building.

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

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

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. 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.

LIGHTING INSTRUCTIONS

1.

STOP! Read safety information above on this label.

9.

Push in control knob all the way and hold down.

2.

Remove outer door

 

 

 

Immediately light the pilot with a match. Continue to hold

3.

Set the thermostat to lowest setting by turning the water

 

control knob in for about one (1) minute after the pilot is

 

temperature dial

clockwise (

) to its lowest

 

lit. Release knob and it will pop back up. Pilot should

 

temperature setting (with arrow on dial) as shown. DO

 

remain lit. If it goes out, repeat steps 3 through 8.

 

NOT FORCE.

 

 

 

• If knob does not pop up when released, stop

 

 

 

 

 

 

 

 

 

 

and immediately call your service technician

 

 

 

 

 

or gas supplier.

 

 

 

 

 

 

• If the pilot will not stay lit after several tries,

 

 

 

 

 

depress and turn the gas control knob

 

 

 

 

 

clockwise

to “OFF” and call your

4.

Turn gas control knob clockwise

to “OFF”

 

service technician or gas supplier.

 

position. Knob cannot be turned from “PILOT” to “OFF”

10.

Replace (or close) inner door. Replace outer

 

unless knob is depressed slightly. DO NOT FORCE.

 

 

door if door does not cover gas control on/off

5.

Wait five (5) minutes to clear out any gas. If you

 

 

knob or temperature adjustment knob.

 

then smell gas, STOP! Follow “B” in the safety information

 

 

11.

At arms length away, turn gas control knob

 

above on this label. If you don't smell gas, go to next

 

step.

 

 

 

counterclockwise

to the full “ON”

6.

Remove (or open) inner door located below gas

 

position. WARNING: Do not use gas control

 

control unit.

 

 

 

knob to regulate gas flow.

7.

Find pilot - follow metal tube from gas control. The pilot

 

12.

At arms length away, set the thermostat to

 

is located in front of the burner or on the right hand

 

 

desired setting. The

mark ( ) indicative of

 

side of the burner.

*

 

 

 

 

 

approximate 120°F is preferred starting point.

 

 

PILOT

 

 

 

 

 

 

 

 

BURNER

 

Some local laws may require a lower starting

 

 

 

*THERMOCOUPLE

 

point. If hotter water is desired, see instruction

8.

If you don’t smell gas, turn knob on gas control counter

 

manual and “warning” below.

 

clockwise

to “PILOT” position.

13.

Replace the outer door if not replaced in step 10.

WARNING

Hotter water increases the risk of scald injury. Before changing temperature setting see instruction manual.

TO TURN OFF GAS TO APPLIANCE

1.Set the thermostat to lowest setting by turning the water

temperature dial clockwise ( ) to its lowest temperature setting (with arrow on dial) as shown.DO NOT FORCE.

2.

Turn gas control knob clockwise

to “OFF”

 

position. Knob cannot be turned from “PILOT” to “OFF”

 

unless knob is depressed slightly. DO NOT FORCE.

3.

Replace outer door (if removed).

 

7

HIGH ALTITUDE INSTALLATION

WARNING

INSTALLATIONS ABOVE 2000 FT. REQUIRE REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE WITH THE FUEL GAS CODE (ANSI Z223.1/NFPA 54). FAILURE TO REPLACE THE ORIFICE COULD RESULT IN IMPROPER AND INEFFICIENT OPERATION OF THE APPLIANCE, PRODUCING CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS, WHICH COULD RESULT IN SERIOUS INJURY OR DEATH. CONTACT YOUR GAS SUPPLIER FOR ANY SPECIFIC CHANGES WHICH MAY BE REQUIRED IN YOUR AREA.

A.O. SMITH DOES BUILD SOME MODELS SPECIFICALLY FOR HIGH ALTITUDE SERVICE.

PLEASE CHECK THE RATING PLATE BEFORE MAKING CHANGES.

DRAFT HOOD OPERATION

Check draft hood operation by performing a worst case depressurization of the building. With all doors and windows closed, and with all air handling equipment and exhaust fans operating, such as furnaces, clothes dryers, range hoods and bathroom fans, a match flame should still be drawn into the draft hood of the water heater with its burner firing. If the flame is not drawn toward the draft hood, shut off water heater and make necessary air supply changes to correct.

TEMPERATURE REGULATION

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, Figure 1, be set for the lowest temperature which satisfies your hot water needs. This also will 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 clockwise to the mechanical stop. Turning the dial counterclockwise increases temperature, and clockwisereduces temperature.

SETTING THE WATER HEATER TEMPERATURE AT 120°F

(APPROX. MARK ON FACE OF THERMOSTAT) WILL REDUCE THE RISK OF SCALDS.Some states require settings at specific lower temperatures.

Figure 4 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 30°F. If you experience this type of use you should consider using lower temperature settings to reduce scald hazards.

Valves for reducing the point-of-usetemperatures by mixing cold and hot water are available (see fig. 2). Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority.

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MAIN MANUAL GAS SHUTOFF VALVE TO THE APPLIANCE. SEE FIGURE 1.

DANGER

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 PAINFUL SCALDING WITH POSSIBLE SERIOUS AND PERMANENT INJURY. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON'S AGE AND THE TIME OF EXPOSURE. THE SLOWER RESPONSE OF CHILDREN, AGED OR 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 CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.

THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS. IF A SUITABLE AREA IS NOT AVAILABLE, A COVER SHOULD BE INSTALLED OVER THE THERMOSTAT TO PREVENT TAMPERING. Suitable covers are available through A.O. Smith Water Products Company, 5621 W. 115th Street, Alsip, IL 60803.

8

Temperature Settings

Time to Produce 2nd & 3rd

Degree Burns on Adult

 

 

 

 

 

VERY HOT =

approx. 160°F

About 1/2 second

C =

approx. 150°F

about 1-1/2seconds

B =

approx. 140°F

Less than 5 seconds

A =

approx. 130°F

About 30 seconds

=

approx. 120°F

More than 5 minutes

LOW =

approx. 80°F

- - - - - - - - - - - - - - - -

 

 

 

FIGURE4

MAINTENANCE

FOR YOUR SAFETY, WATER HEATER SERVICE SHOULD BE PERFORMED ONLY BY A QUALIFIED SERVICE 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 PERIODICALLY BY A QUALIFIED SERVICE TECHNICIAN.

PILOT AND MAIN BURNER

Check pilot and main burner every 12 months for proper flame characteristics. This is done by removing door(s) on heater, fig. 1. The main burner should provide complete combustion of gas; ignite rapidly; give reasonably 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-UPINDICATES A PROBLEM THAT REQUIRES CORRECTION BEFORE FURTHER USE. CONSULT WITH A QUALIFIED SERVICE TECHNICIAN.

Should the main burner or burner air openings require cleaning, turn the gas control knob 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.

HIGH TEMPERATURE LIMIT SWITCH

(Single-UseType Energy Cut Off)

The thermostat has a built-inlimit switch which will extinguish the pilot light in case of excessive water temperatures. The pilot cannot be relit until the entire thermostat (labeled assingle-usetype) is replaced. It is important that a serviceman be called to determine the reason for limit operation and thus avoid repeated thermostat replacement. Lower the temperature adjustment dial setting on new control.

VENTING SYSTEM

HAVE VENTING SYSTEM CHECKED EVERY TWELVE MONTHS FOR OBSTRUCTIONS AND/OR DETERIORATION IN VENT PIPING.

T & P VALVE

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.

WARNING

THE WATER PASSING OUT OF THE VALVE DURING THIS CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND DISCHARGE SAFELY TO PREVENT WATER DAMAGE.

DRAINING

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

BE CAREFUL TO GRASP THE DRAIN VALVE HANDLE SO THAT THE HAND IS NOT EXPOSED TO HOT WATER. IF DESIRED, A HOSE MAY BE CONNECTED TO THE DRAIN VALVE TO CARRY THE WATERAWAY.

DANGER: The water CAN BE HOT.

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

To restart heater, refer to the FILLING instructions under OPERATION.

Periodically open the drain valve and allow the water to run until it flows clean. This will help prevent sediment build-upin the tank. It is normal for lime and scale deposits to form within the tank. 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.

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.

If water drops fall from the draft hood, it is water vapor condensed from combustion products due to a problem in the vent. It may also be the result of leaking rain water.

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 with 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-USEPERIODS).

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

ANODE ROD MAINTENANCE

The anode rod is used to protect the tank from corrosion. Most hot water tanks are equipped with an anode rod. The submerged rod sacrifices itself to protect the tank. Instead of corroding the tank, water ions attack and eat away the anode rod. This does not affect the water's taste or color. The rod must be maintained to keep the tank in operating condition. Anode deterioration depends on water conductivity, not necessarily water condition. A corroded or pitted anode rod

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indicates high water conductivity and should be checked and/ or replaced more often than an anode rod that appears to be intact. Replacement of a depleted anode rod can extend the

life of your water heater. Inspection should be conducted by a qualified technician, and at a minimum should be checked annually after the warranty period.

TROUBLESHOOTING

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

PROBLEM

CAUSE

SOLUTION

 

Improperly sealed, hot or cold supply connections,

 

 

relief valve, drain valve or thermostat threads.

Tighten threaded connections.

WATER LEAKS

Leakage from other appliances or water lines.

Inspect other appliances near water heater.

 

 

 

 

Condensation of flue products.

Refer to CONDENSATION.

 

 

 

 

Thermal expansion in closed water system.

Install thermal expansion tank

 

 

(DO NOT plug T & P valve).

LEAKING T & P

Improperly seated valve.

Check relief valve for proper operation

 

 

 

(DO NOT plug T & P valve).

HOT WATER ODORS

High sulfate or mineral content in water supply.

Drain and flush heater thoroughly, then refill.

(Refer to CATHODIC

 

 

 

 

PROTECTION,)

Bacteria in water supply.

Chlorinate or aerate water supply.

 

Dirty pilot burner.

Clean pilot assembly.

 

 

 

PILOT OUTAGE

Thermocouple tip is not in contact with pilot flame.

Insert thermocouple correctly.

 

 

 

 

Thermocouple malfunction.

Replace thermocouple

 

 

 

 

Thermocouple malfunction.

Check thermostat.

 

 

 

 

Gas knob dial not positioned correctly.

Refer to LIGHTING INSTRUCTIONS.

PILOT WILL

 

 

Pilot orifice clogged.

Clean or replace pilot orifice.

NOT LIGHT

 

 

 

Pinched or clogged pilot tube.

Replace pilot tube.

 

 

 

 

Main gas supply off.

Turn on main gas shutoff valve.

 

 

 

 

Heater not lit or thermostat not on.

Refer to LIGHTING INSTRUCTIONS.

 

 

 

 

Thermostat set too low.

Refer to TEMPERATURE REGULATION

 

 

 

 

Heater undersized.

Reduce hot water use.

NOT ENOUGH

 

 

Low gas pressure.

Contact dealer.

OR

 

 

NO HOT WATER

Incoming water is unusually cold.

Allow more time for heater to re-heat.

 

 

Leaking hot water pipes or fixtures.

Have plumber check and repair leaks.

 

 

 

 

High temperature limit switch activated.

Contact dealer to determine cause. See

 

 

HIGH TEMPERATURE SWITCH note below.

WATER TOO HOT

Thermostat set too high.

Refer to HIGH TEMPERATURE REGULATION

WATER HEATER

Condensation dripping on burner.

Refer to CONDENSATION above.

 

 

 

 

SOUNDS:

Sediment at bottom of heater tank.

Clean sediment from tank. Refer to DRAINING

SIZZLING·RUMBLING

 

instructions in Maintenance section of manual.

 

 

 

SOOTING

Improper combustion

Refer to AIR REQUIREMENTS on page 4.

 

 

 

 

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