A.O. Smith FPSH Owner's Manual

RESIDENTIAL GAS WATER HEATERS

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.

Power Vented Gas Models

FPSH/FPCR/FPST with SmartValve

TM

,

Hot Surface Ignition

& 2” PVC Vent Capability

TABLE OF CONTENTS

PAGE

2 GET TO KNOW YOUR WATER HEATER

GENERAL SAFETY INFORMATION 3

4-12 INSTALLATION

OPERATION & LIGHTING INSTRUCTIONS 12-14

MAINTENANCE

TROUBLESHOOTING

WARRANTY

15-16

16-17

18

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

MCBEE, SOUTH CAROLINA www.hotwater.com

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

PRINTED IN U.S.A. 2566 200

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

PART NO. 183432-000 REV.1

1 SUPERSEDES PART NO. 183323-000

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 your A. O. Smith plumber or contact the A. O. Smith

Water Products Company, 5621 W. 115th Street, Alsip, IL 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). Standard hardware items may be purchased locally.

(A) VENT PIPE-EXHAUST

(B) ANODE

(C) HOT WATER OUTLET

(D) OUTLET (115 VAC)

(E) FLUE BAFFLE

(F) GAS SUPPLY

(G) MAIN MANUAL GAS

SHUT OFF VALVE

(H) GROUND JOINT UNION

(J) DIRT LEG

(K) OUTER DOOR

(L) UNION

(M) INLET WATER SHUT

OFF VALVE

(N) COLD WATER INLET

(O) INLET DIP TUBE

(P) TEMPERATURE AND

PRESSURE RELIEF VALVE

(Q) EMBLEM AND RATING PLATE

(R) INSULATION

(S) VENT TERMINAL

(T) DRAIN VALVE

(U) HSI BURNER ASSEMBLY

(V) FLUE

(W) DRAIN PAN

(X) GAS VALVE

(Y) CONTROL HARNESS

(Z) CONDENSATE TUBE

(AA) INNER DOOR

SMARTVALVE TM CONTROL SYSTEM

*CAUTION: 115VAC IN CONTROL HARNESS

AND INSIDE OUTER DOOR

WATER

TEMPERATURE

ADJUSTING DIAL

GAS MODELS

FPSH/FPCR/FPST

WITH HOT SURFACE IGNITION AND

SMARTVALVE

TM

- 2” PVC VENT CAPABILITY

FIGURE 1

2

GENERAL SAFETY INFORMATION

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.

EXTERNAL DAMAGE

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

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-GAS SITUATION, DO NOT

TRY TO RELIGHT APLIANCE 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.

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. The limited warranty is voided when failure of water heater is due to a corrosive atmosphere. (Reference is made to the limited warranty for complete terms and conditions).

EXTENDED NON-USE PERIODS

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

IMPROPER COMBUSTION

WARNING

ATTIC AND/OR EXHAUST FANS OPERATING ON THE

PREMISES WITH A WATER HEATER CAN RESULT IN CARBON

MONOXIDE POISONING AND DEATH.

Insulation blankets available to the general public for external use on gas water heaters are not approved for use on your A.O.

Smith water heater. 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 and exceeds the

National Appliance Energy Conservation Act standards with respect to insulation and standby loss requirements, making an insulation blanket unnecessary.

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 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.

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 OBSTRUCT THE FLOW OF COMBUSTION AND

VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND

VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.

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

LIQUID PETROLEUM MODELS

• Do not allow insulation to come within 2" of the floor to prevent blockage of combustion air flow to the burner.

WARNING

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.

• 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.

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

• Do inspect the insulation blanket frequently to make certain it does not sag, thereby obstructing combustion air flow.

UNCONFINED SPACE

INSTALLATION

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

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.

If the unconfined space is within a building of tight construction

(as defined in the most recent revision of the National Fuel Gas

Code Handbook), air for combustion, ventilation, and venter dilution must be obtained from outdoors. The installation instructions for confined spaces must be followed.

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 and the National Electrical

Code, NFPA 70. The former is available from the Canadian

Standards Association, 8501 East Pleasant Valley Road,

Cleveland, OH 44131, and both documents are available from the National Fire Protection Association, 1 Batterymarch Park,

Quincy, MA 02269.

HIGH ALTITUDE INSTALLATION

WARNING

INSTALLATIONS ABOVE 6500 FEET REQUIRE REPLACEMENT

OF THE BURNER ORIFICE IN ACCORDANCE WITH THE

NATIONAL FUEL GAS CODE (ANSI Z223.1/NFPA 54). FAILURE

TO REPLACE THE ORIFICE WILL RESULT IN IMPROPER AND

INEFFICIENT OPERATION OF THE APPLIANCE, PRODUCING

CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS,

WHICH COULD RESULT IN SERIOUS PERSONAL INJURY OR

DEATH.

LOCATION OF HEATER

The heater is design certified by the American Gas Association for installation on combustible flooring in a closet having minimum clearances from combustible material of: 0" clearance from sides and rear, 4" from the front and 12" from the top. (Standard clearance.) If clearances stated on the heater differ from standard clearances, install water heater according to clearances stated on heater.

Installation:

Do not install water heater where flammable products will be stored or used unless the main burner and hot surface igniter are at least

18” above the floor. This will reduce, but not eliminate, the risk of vapors being ignited by the main burner or hot surface igniter.

CONFINED SPACE

Adequate clearance for servicing this appliance should be considered before installation, such as changing the anodes, etc

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

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 IN

OR 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.

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

AIR REQUIREMENTS

Dilution air temperature must be 100°F or less. 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.

If the confined space is within a building of tight construction, air for combustion, ventilationand 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.

4

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 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, Product Service

Division, 5621 W. 115th Street, Alsip, IL 60803, 1-800-433-2545.

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 the situation. Do not plug the temperature and pressure relief valve.

GAS CONNECTIONS

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 DRAINING.

WATER CONNECTIONS

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

The minimum gas supply pressure is 5.0" W.C for natural gas

(11.0" W.C. for propane).

THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER

THAN 14.0'' WATER COLUMN 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.

WATER (POTABLE) HEATING AND SPACE

HEATING

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

IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING

FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING

MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.

2. Toxic chemicals, such as those used for boiler treatment, shall

NEVER be introduced into this system.

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.

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

REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE

ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS

CLEAN ON THE INSIDE.

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 Figure 2 for suggested piping arrangement.

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 National Fuel Gas Code, ANSI Z223.1.

To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve inlet. The thermostat inlet has a pad for use with back up 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 gas valve fittings.

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

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.

5

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 manufacturer also recommends that the vent termination should 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.

BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR

GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR

OTHER MATERIAL ACCEPTABLE FOR THIS PURPOSE. DO

NOT USE MATCHES CANDLES, FLAME OR OTHER SOURCES

OF IGNITION TO LOCATE GAS LEAKS.

The vent shall terminate a minimum of 12'' above expected snowfall level to prevent blockage of vent termination.

RELIEF VALVE (P)-FIG. 1

A NEW TEMPERATURE AND PRESSURE RELIEF VALVE

COMPLYING WITH THE STANDARD FOR RELIEF VALVES AND

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 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.

4. In cold climates, it is recommended that vent termination 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 LOCATION OF HEATER and

VENT TERMINAL INSTALLATIONS, and with the National Fuel

Gas Code and local codes.

blower outlet.

IMPORTANT

Plan the layout of the vent system backwards from the vent termination to the appliance. Take into consideration that an elbow may be necessary to make the first vent pipe connection to the

CAUTION

Use only the vent terminal supplied with this unit. Termination of a sidewall vent system with a device other than the supplied vent terminal could affect system performance and result in a safety hazard.

VENTING

VENT TERMINAL INSTALLATION

WARNING

NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO

THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID

RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR

ASPHYXIATION.

1. After the point of termination has been determined, use the cover plate as a template to mark the hole for the vent pipe to insert through the wall. BEWARE OF CONCEALED WIRING

AND PIPING INSIDE OF WALL.

VENT PIPE TERMINATION

NOTE: Before installing power venter determine place of vent pipe termination. See figure3 on page 7.

IMPORTANT

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.

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, as follows:

3. A) MASONRY SIDE WALLS

Chisel an opening approximately one half inch larger than the marked circle.

1. The exit terminals of a mechanical vent system shall be not less than 7 feet above grade when located adjacent to public walkways. (Figure. 3)

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

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 pipe to easily slide through the opening.

The resulting gap will be covered up by the vent terminal cover plates.) Repeat this step on inside wall if necessary.

6

WARNING

VENT HOOD(S) MAY

BE EXTREMELY HOT

DURING OPERATION

FIGURE 3

SEQUENCE OF INSTALLATION

This unit can vent through two (2) or three (3) inch PVC pipe and fittings. The vent terminal supplied with the unit must be used for both two or three inch pipe.

1. The FPSH/FPCR/FPST Power Vent Models come with the blower assembly installed.

2. After the unit is set in place, make sure the blower assembly is still mounted securely. Also make sure there is no damage to the blower.

The vent pipe installation can be started from either the blower discharge or the termination wall. Keep in mind the total vent system

(pipe and elbows) when installing the vent system. (SEE VENT

CHART ON PAGES 9-10.)

3. Make sure there is no packing material in the discharge of the blower or the intake of the dilution air restrictor. See

Fig. 5 for description of blower parts.

4. Make sure that the plastic tubing is still attached from the air pressure switch to the port on the blower housing.

5. Make sure the ON/OFF switch is in the OFF position and then connect the outer harness from the blower control box to the connector on the right side of the gas valve.

The two clips should be installed on the side of the water heater and the wire placed through the opening in the side of the clip. The clips should be placed so as to hold the harness as close as possible to the side of the unit and away from any hot surfaces.

FIGURE 4

The vent terminal should be kept as close as possible to the outside wall, but you need to allow at least 1.5 inches of pipe past the wall, for the wall flange and vent terminal to mount on the pipe.

Before the vent terminal is installed, caulk (not supplied) around the pipe on the exterior wall and install the wall flange (can be held to the outside wall by placing some of the caulking on the back of the flange).

Consider all of the 90 degree and 45 degree elbows, plus the number of feet of pipe that would be needed for the installation of total vent system.

Review the charts on Page9, to make sure that the vent system is within the allowed vent configuration.

7

FIGURE 5

THIS UNIT IS MANUFACTURED WITH AN EXTERNAL

CONTROL HARNESS FOR EASIER REPLACEMENT IF THE

HARNESS OR CONNECTORS GET DAMAGED.

INSTALLATION OF VENT SYSTEM

(Refer to Figures 3, 4, 5,7 and 8 as guides).

6. Do not plug in power cord until vent system is completely installed. The Power Vent operates on 110-120 Vac, therefore a grounded outlet must be within reach of the six (6) foot flexible power cord supplied with the unit (see fig. 1). The power cord supplied may be used only where local codes permit. If local codes do not permit the use of a flexible power supply cord:

1. Plan the route of the vent system from the discharge of the blower to the planned location of the vent terminal. Layout the total vent system to use minimum of vent pipe and elbows.

2. Refer to charts on page 9, for instructions for total vent length, for both two (2) and three (3) inch vent pipe. See information below on what types of material can be used for pipe and fittings. Note: Use only vent terminal supplied with unit!

a.)Make sure the unit is unplugged from wall outlet. Remove screw and open access panel on side of control box.

3. See the instructions on pages 11 and 12 for the proper method of cutting and cementing the PVC pipe and fittings.

b.) Cut the flexible power cord, leaving enough to be able to make connections, then remove the strain relief fitting from box.

4. A 2” elbow or coupling should be mounted to the discharge or the blower and secured with silicone sealant.

c.) Install suitable conduit fitting in top of enclosure and then follow (D) and (E) below.

d.) Splice field wiring into existing wiring using code authorized method (wire nuts, etc.).

e.) Be certain that neutral and line connections are not reversed when making these connections.

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 TERMINATION, should be equivalent to PVC-

DWV fittings meeting ASTM D-2665 (Use CPVC fittings, ASTM

F-438 for CPVC pipe and ABS fittings, ASTM D-2661/3311 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 Termination Tee (PVC Material).

f.) Close panel on the side of control box, make sure that access panel issecured shut.

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.

CAUTION

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN

SERVICING CONTROLS. WIRING ERRORS CAN CAUSE

IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER

OPERATION AFTER SERVICING.

NOTE: 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 (MUST

USE SUPPLIED VENT TERMINAL) be used.

FIGURE 6

8

FIGURE 7

5. The temperature of the flue gases leaving the blower is about

140°F to 175°F after mixing with the dilution air in the inlet adapter of the blower. Even with a high concentration of room air taken into the vent system for dilution air, there will be some installations where condensate will be formed in the horizontal or vertical run of pipe. Any of this condensate that runs back into the blower housing must be drained out of the blower

Two (2)

Three (3)

Three (3)

Four (4)

Four (4)

TABLE FOR VENT PIPE LENGTH FOR FPSH/FPCR UNITS

TWO INCH DIAMETER PIPE

**Number of 90° Elbows

One (1)

One (1)

Two (2)


None

One (1)

None

One (1)

None

One (1)

None

One (1)

Minimum Pipe

2 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

Maximum Pipe

46 Ft.

42 Ft.

38 Ft.

34 Ft.

30 Ft.

26 Ft.

22 Ft.

18 Ft.

** Number of 90° Elbows

One (1)

One (1)

Two (2)

Two (2)

Three (3)

Three (3)

Four (4)

Four (4)

***Five (5)

***Five (5)

***Six (6)

THREE INCH DIAMETER PIPE


None

One (1)

None

One (1)

None

One (1)

None

One (1)

None

One (1)

None

Minimum Pipe

2 Ft.

2 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

Maximum Pipe

75 Ft.

72.5 Ft.

70 Ft.

67.5 Ft.

65 Ft.

62.5 Ft.

60 Ft.

57.5 Ft.

55 Ft.

52.5 Ft.

50 Ft.

** One (1) 90° elbow is equal to two (2) 45° elbows.

*** It is not recommended that more than (4) 90° elbows be used, or a combination of three (3) 90° and two (2) 45° elbows, but as long as the

total length is less than in the chart above, the vent system is acceptable.

Note: For the two inch vent, one (1) 90° elbow is approximately the same as eight (8) feet of pipe. For the three inch vent, one (1) 90° elbow is

approximately the same as five (5) feet of pipe.


One (1)

One (1)

Two (2)

Two (2)

Three (3)

Three (3)

Four (4)

TABLE FOR VENT PIPE LENGTH FOR FPST UNITS

TWO INCH DIAMETER PIPE


None

One (1)

None

One (1)

None

One (1)

None

Minimum Pipe

2 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

Maximum Pipe

27 Ft.

23 Ft.

19 Ft.

15 Ft.

11 Ft.

7 Ft.

3 Ft.

THREE INCH DIAMETER PIPE

** Number of 90° Elbows **Number of 45° Elbows

One (1)

One (1)

Two (2)

Two (2)

None

One (1)

None

One (1)

Minimum Pipe

2 Ft.

2 Ft.

1 Ft.

1 Ft.

Three (3)

Three (3)

Four (4)

Four (4)

***Five (5)

***Five (5)

***Six (6)

None

One (1)

None

One (1)

None

One (1)

None

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

1 Ft.

Maximum Pipe

65 Ft.

62.5 Ft.

60 Ft.

57.5 Ft.

55 Ft.

52.5 Ft.

50 Ft.

47.5 Ft.

45 Ft.

42.5 Ft.

40 Ft.

** One (1) 90° elbow is equal to two (2) 45° elbows.

*** It is not recommended that more than (4) 90° elbows be used, or a combination of three (3) 90° and two (2) 45° elbows, but as long as the

total length is less than in the chart above, the vent system is acceptable.

Note: For the two inch vent, one (1) 90° elbow is approximately the same as eight (8) feet of pipe. For the three inch vent, one (1) 90° elbow is

approximately the same as five (5) feet of pipe.

9

through the drain in the bottom of the housing. A plastic tube is furnished for the condensate to be drained away from the water heater.

VENT PIPE PREPARATION

A method to keep the condensate from draining back to the blower, in a horizontal run, is to install the pipe with a slight downward slope. The pipe can slope 1/4 inch per five (5) feet of pipe, but no more than 1.5 inches in the total vent length.

1. INITIAL PREPARATION

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.

The vent system should be supported every five(5) feet of vertical run and every three (3) feet of horizontal run of vent pipe length. All pipe and fittings should be joined by the proper procedures discussed on pages 11 and 12, under the heading:

VENT PIPE PREPARATION.

C. Know the reputation of your manufacturer and their products.

VERTICAL VENT THROUGH ROOF

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.

This unit is approved for venting through the roof with only the vent terminal that is included with the unit. All proper flashing or

“BOOT” should be used to seal the pipe where it exits the roof.

E. Closely supervise the installation and inspect the finished job before start-up.

The total vent system should not exceed that which is specified in the chart on page 9.

F.

Contact the manufacturer, supplier, or competent consulting agency if you have any questions about the application or installation of PVC and CPVC pipe.

All of the pipe should be secured as per the instructions in the

“INSTALLATION OF VENT SYSTEM” on pages 8 and 9.

VERTICAL VENT TERMINATION RESTRICTIONS

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.

1. Minimum of twelve (12) inches above the roof or twelve (12) inches above the anticipated snow level. Provide proper support for all pipe protruding through the roof.

2. SELECTION OF MATERIALS

2. Four (4) feet from or one (1) foot above any gable, dormer, or other roof structure with access to interior of building (i.e.-vent, window etc.).

3. Three (3) feet above any forced air inlet located within ten (10) feet.

• Cutting Device - Saw or Pipe Cutter

• Deburring Tool, Knife, File, or Beveling Machine (2" and

above)

• Brush - Pure Bristle

• 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 basisof their application with respect to chemical

resistance, pressure rating, temperature characteristics, etc.

• Insertion Tool - Helpful for larger diameter pipe and fittings

(6" and above).

FIGURE 8

PRIMER

It is recommended that Tetrahydrofuran (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 allpurpose cements, commercial glues and adhesives or ABS cement to join PVC or CPVC pipe and fittings.

10

SAFETY PRECAUTION: PRIMERS AND CEMENTS ARE

EXTREMELY FLAMMABLE, AND MUST NOT BE STORED OR

USED NEAR HEAT OR OPEN FLAME. ALSO, USE ONLY IN A

WELL-VENTILATED AREA.

APPLICATORS

Select a suitable pure bristle type paint brush. Use a proper width brush or roller to apply the primer and cement (see chart below).

Speedy application of cement is important due to its fast drying characteristics. IMPORTANT NOTE: A dauber type applicator should only be used on pipe sizes 2" and below. For larger diameter pipe, a brush or roller must be used.

RECOMMENDED BRUSH* SIZE FOR PRIMER

AND CEMENT APPLICATIONS

Nominal Pipe

(IPS)

2

3

*USE ONLY NATURAL BRISTLE

3. MAKING THE JOINT

SizeBrush Width

(INS.)

1-1/2

1-1/2 - 2-1/2 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

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. You 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.

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.

Apply primer to the surface of the pipe and fitting socket with a natural bristle brush (see chart on this page). 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.

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

STEP E

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.

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: 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.

STEP B

C. Test dry fit of the joint

Tapered fitting sockets are designed so that an interfaced 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

11

STEP F

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.

TO OPERATE THE WATER HEATER

FILLING

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

Fig. 1 (T)

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(M)

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

5. The heater is ready to be operated.

TEMPERATURE REGULATION

STEP G

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.

T & P VALVE and PIPE INSULATION (On Selected Models)

Remove insulation for T & P

Valve and pipe connections from carton.

WARNING

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 TIME 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 A CHILD OR DISABLED PERSON UNATTENDED IN A

BATHTUB OR SHOWER.

Fit pipe insulation over the incoming cold water line and the hot water line. Make sure that

the insulation is against the top cover of the heater.

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.

Fit T & P valve insulation over valve. Make sure that the insulation does not interfere with the lever of the T & P valve.

Secure all insulation using tape.

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 which 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; Turning the dial counterclockwise decreases temperature, and clockwise increases temperature.

OPERATION

SETTING THE WATER HEATER TEMPERATURE AT 120°F

(APPROX. "HOT" MARK ON TEMPERATURE SETTING DIAL

OF GAS VALVE) WILL REDUCE THE RISK OF SCALDS . Some states require settings at specific lower temperatures.

WARNING

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.

12

Figure 9 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.

FOR YOUR SAFETY READ BEFORE OPERATING

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 OPERATING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES.

A. This appliance does not have a pilot. It is equipped • If you cannot reach your gas supplier, call the fire with an ignition device which automatically lights the burner. Do NOT try to light the pilot by hand.

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 TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

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

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

department.

C. Use only your hand to turn the gas control lever.

Never use tools. If the lever 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.

OPERATING 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.

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

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. WATER 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 temperature.

WARNING: TURN OFF ALL ELECTRIC

POWER BEFORE SERVICING

TO TURN OFF GAS TO APPLIANCE

A. Set thermostat to the lowest setting.

B. Turn off all electric power to the appliance if service is to be performed.

13

Temperature Setting

VERY HOT= approx. 160*F

C = approx. 150*F

B = approx. 140*F

A = approx. 130*F

HOT = approx. 120*F

LOW = approx. 80*F

FIGURE 9

Time to Produce 2nd & 3rd

Degree Burns on Adult Skin

About 1/2 second

About 1-1/2 seconds

Less than 5 seconds

About 30 seconds

More than 5 minutes

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

Valves for reducing the point-of-use temperature by mixing cold and hot water are available. See figure 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 SHUTOFF, TURN OFF THE MANUAL GAS CONTROL VALVE

TO THE APPLIANCE. SEE FIGURE 1(G).

WATER HEATING IGNITION SEQUENCE

(Make sure gas and electric power are connected properly)

1) The ignition control module is powered and monitors the system, waiting for a call for heat from the thermostat.

2) The thermostat calls for heat by reading a resistance value within a given range directly proprtional to water temperature.

3) The control Module: a) Checks the pressure switch for an open circuit.

b) Energizes the blower.

c) Checks the pressure switch for a closed circuit to prove

draft.

d) Sends line voltage to the hot surface igniter with a 7-second

warm up period.

e) Opens the gas valve and checks the sensing rod for flame.

4) The burner heats the water to the desired thermostat setting.

a) The resistance in the thermostat rises to the value selected

by the temperature control knob.

b) The control module closes the gas valve and 5 seconds

later, removes power from the blower.

5) Cycle is completed.

FIGURE 10

CONTROL SEQUENCE - HOT SURFACE DIRECT IGNITION

Pre-purge

HSI Warm-up

Ignition Activation Period

Flame Recognition Period

Ignition Trial

5 sec.

7 sec. 1st try, then 12 sec.

3 sec.

1sec.

4sec.

Interpurge

Post-purge

Retries

Reset from Lockout

Flame Sensing (Nominal)

HSI Off/Run Mode

30sec.

5sec.

3

1 hr.

0.4µ

14

MAINTENANCE

should be checked periodically for any accumulation of dust and lint. Any build up of dirt in the screen can result in insufficient dilution air and excessive vent temperatures that could cause heat damage to the PVC pipe.

WARNING

DISCONNECT FROM ELECTRICAL SUPPLY BEFORE

SERVICING UNIT.

The venter must be inspected four times a year. Points of inspection are:

1. MOTOR - Motor must rotate freely.

FOR YOUR SAFETY, WATER HEATER SERVICE SHOULD BE

PERFORMED ONLY BY A QUALIFIED SERVICE TECHNICIAN.

READ THE GENERAL SAFETY INFORMATION SECTION FIRST.

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

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

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.

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

MAIN BURNER -FIG. 1

T & P VALVE

Check 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.

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.

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.

DANGER

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 (T)-FIG. 1

WARNING

SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES

CORRECTION BEFORE FURTHER USE. Consult with a qualified service technician.

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.

Should the main burner or burner air openings require cleaning, turn the blower 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.

• 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 WATER AWAY.

HIGH TEMPERATURE LIMIT SWITCH

(Single-UseType Energy Cut Off)

The thermostat has a built-in limit switch which will actuate in case of excessive water temperatures. The heater cannot be relit until the ECO (labeled as single-use type) 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.

DANGER:

The water MAY 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-up in the tank.

VENTING SYSTEM (S)-FIG. 10

HAVE VENTING SYSTEM CHECKED EVERY SIX MONTHS

FOR OBSTRUCTIONS AND/OR DETERIORATION IN VENT

PIPING.

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. See page 2 for recommended deliming information.

POWER VENTER MAINTENANCE

CONDENSATION

CAUTION

The air flow restrictor screen on the inlet side of the blower unit

15

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 (FIG. 1)

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).

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

WARNING : DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE.

OPERATE ONLY AS WIRED FROM FACTORY.

TROUBLE SHOOTING

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 LED STATUS CAUSE

Off No power to system control.

SOLUTION

Check for power to heater.

Check wiring harness for proper connections.

Check for line voltage at harness connectors.

Slow Blink

Bright-Dim Normal operation Not applicable.

1 Flash Setpoint error, internal failure detected.

GAS

VALVE

2 Flashes

3 Flashes

4 Flashes

6 Flashes

Rapidly blinking

Pressure switch failed to open.

Pressure switch failed to close.

ECO activated.

Blower Assembly is energized.

Internal hardware failure.

Flame signal sensed out of sequence.

Blower Assembly is energized.

System lockout.

Water temperature is below 36°F.

Loose connection between valve and spud assembly.

Internal component failure.

Replace gas control valve.

Replace pressure switch.


Replace blower assembly.


Replace blower assembly.

Replace ECO.



Insure that burner stays lit.

Insure that igniter wires are not loose at gas valve.


Insure that burner stays lit.

Insure that igniter wires are not loose at gas valve.


Gas supply is off or too low to operate.

Damaged or broken HSI element.

Appliance not properly earth ground.

Flame sense rod contaminated or not positioned correctly.

HSI element not positioned correctly.

HSI element or flame sense rod wiring not connected properly.

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

Cycle external power or remove request for heat for 2 seconds before reapplying.

Wait until gas control generates a self-reset.

Make sure connections are properly seated.


16

PROBLEM

NOT ENOUGH

HOT WATER

VENT PIPE TOO HOT

(ABOVE 170°F)

YELLOW FLAME

CONDENSATION

WATER LEAKS

LEAKING T&P

HOT WATER ODORS

(Refer to CATHODIC

PROTECTION

WATER TOO HOT

WATER HEATER SOUNDS

SIZZLING-RUMBLING

SOOTING

TROUBLE SHOOTING (Continued)

CAUSE

1) Blower will not run.

A) “ON/OFF” control switch turned off.

B) Blower unplugged.

C) No power at outlet.

D) Thermostat defective.

E) Control harness defective.

F) High limit control circuit open.

G) Blower motor defective.

Thermosat problems.

A) Themostat set too low.

B) Thermostat or ECO defective.

Others

A) Heater undersized.

B) Low gas pressure.

C) Incoming water is unusually cold.

D) Leaking hot water pipes or fixtures.

A) Defective air flow restrictor.

B) Not enough dilution air to mix with

flue gases in inlet tee.

C) Dilution air too hot for mixing with

flue gases.

D) Wrong burner orifice.

A) Dirt in burner ports

B) Combustion air path restricted.

C) Not enough dilution air for proper

combustion.

A) Water on the floor under heater.

B) Water dripping from pan.

SOLUTION

Turn switch to the “ON” position.

Plug blower back into 115 Vac. outlet.

Repair service to outlet.

Replace thermostat.

Replace control harness.

Replace ECO.

Replace Blower Assembly.

Turn temperature control higher.

Replace thermostat or ECO as required.

Reduce hot water use.

Contact dealer.

Allow more time for heater to re-heat.

Have plumber check and repair leaks.

Take unit out of service immediately, call an

A.O. Smith service representative.

Proper dilution air must be provided for combustion and dilution of flue temp.

Refer to “INSTALLATION” section.

Supply air is too hot. Check for heat sources around intake terminal and blockage of dilution air leg.

Install correct orifice.

Turn off heater and gas, clean burner head.

Check intake venting arrangements for obstructions.

Check Intake venting arrangement for obstructions.

See “CONDENSATION” section.

Provide drip “TEE” to catch condensation, see figure 1.

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.

Tighten threaded connections.

Inspect other appliances near water heater.

Refer to “CONDENSATION” section.

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 then refill.

High sulfate or minerial content in water supply.

Bacteria in water supply.

Thermostat set too high.

Condensation dripping on burner.

Sediment at bottom of heater tank.

Improper combustion.

Chlorinate water supply.

Refer to HIGH TEMPERATURE REGULATION.

Refer to CONDENSATION above.

Clean sediment from tank. Refer to DRAINING instruction in Maintenance section of manual.

Refer to AIR REQUIREMENTS on page 4.

17

LIMITED RESIDENTIAL GAS WARRANTY

THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER

ONLY. If the glass lined tank in this water heater shall prove upon examination by A. O. Smith Corporation (the warrantor) to have leaked during the warranty period in normal residential use, due to natural corrosion from potable water therein, the warrantor will furnish the ORIGINAL OWNER a replacement A. O. Smith water heater of equivalent size and current model, or a replacement part for any component part which fails in normal use, in accordance with the warranty terms and conditions specified below. THE A. O. SMITH REPLACEMENT MODEL OR PART

WILL BE WARRANTED FOR ONLY THE UNEXPIRED PORTION

OF THE ORIGINAL WARRANTY. The warranty period will be determined by the original installation date of the water heater.

PROOF-OF-PURCHASE AND PROOF-OF-INSTALLATION ARE

NECESSARY TO VALIDATE THIS WARRANTY. This warranty is not transferable and applies to models listed in Table 1.

a. Labor charges for service, removal, or reinstallation of the water heater or part thereof.

b. Shipping and delivery charges for forwarding the new water heater or replacement part from the nearest distributor and returning the claimed defective heater or part to such distributor except in the state of California where such charges are the manufacturer’s responsibility.

c. All cost necessary or incidental for handling and administrative charges, and for any materials and/or permits required for installation of the replacement heater or part.

LIMITATION ON IMPLIED WARRANTIES

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

MODEL

FPSH

FPCR

FPST

TABLE 1

WARRANTY PERIOD

TANK 1

6 YEARS

6 YEARS

6 YEARS

PARTS 2

2 YEARS

2 YEARS

2 YEARS

CLAIM PROCEDURE

Any claim under this 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 practical, the owner should contact: A. O. Smith Water Products Company, 5621 West 115th

Street, Alsip, Illinois, 60803 (800) 323-2636. Canadian customers should contact A. O. Smith Enterprises, Ltd., P.O. Box 310-768

Erie Street, Stratford, Ontario N5A 6T3, (519) 271-5800.

When the water heater has been used for other than single family residential application: 1. The tank warranty shall be reduced to

1 year. 2. The parts warranty shall be reduced to 1 year for all models. Returned parts which meet any of the following conditions are not covered by this warranty: 1) improper installation or removal; 2) damaged by other than normal wear; 3) replaced for cosmetic purposes; or 4) returned with defaced date codes.

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

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

CONDITIONS AND EXCEPTIONS

This warranty shall apply only when the water heater is installed and operated in accordance with: 1) all local fire codes and plumbing codes, ordinances and regulations; 2) the printed instructions provided with it; 3) good industry practices; and 4) proper safety practices such as but not limited to a properly sized drain pan if installed in an area where leakage from connections of the tank would result in damage to the area adjacent to the heater. In addition, a new temperature and pressure relief valve, certified by the American Gas Association must have been properly installed and piped to the nearest drain.

This warranty shall apply only when the heater is:

• owned by the original purchaser;

• used at temperatures not exceeding the maximum calibrated

setting of its thermostat;

• not subjected to excessive water pressure fluctuations and not

subject to an operating pressure greater than 150 P.S.I.;

• filled with potable water, free to circulate at all times and with

the tank free of damaging water sediment or scale deposits;

• used in a non-corrosive and non-contaminated atmosphere;

• used with factory approved anode(s) installed;

• in its original installation location;

• in the United States, its territories or possessions, and Canada;

• sized in accordance with proper sizing techniques for residential

water heaters;

• bearing a rating plate which has not been altered, defaced or

removed except as required by the warrantor;

• not used in a closed system without a properly sized and installed

thermal expansion tank;

• fired at the factory rated input using the fuel stated in the face of

the rating plate;

• operated with the inner and outer combustion chamber doors

in place;

• maintained in accordance with the instructions printed in the

manual included with the heater.

PROOF-OF-PURCHASE AND PROOF-OF-INSTALLATION

DATES ARE REQUIRED TO SUPPORT WARRANTY FOR

CLAIM FROM ORIGINAL OWNER. THIS FORM DOES NOT

CONSTITUTE PROOF-OF-PURCHASE OR PROOF-OF-

INSTALLATION.

DISCLAIMERS

NO EXPRESSED WARRANTY HAS BEEN OR WILL BE MADE

IN BEHALF OF THE WARRANTOR WITH RESPECT TO THE

HEATER OR THE INSTALLATION, OPERATION, REPAIR OR

REPLACEMENT OF THE HEATER OR PARTS. THE

WARRANTOR SHALL NOT BE RESPONSIBLE FOR WATER

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 OTHERWISE

FOR DAMAGE TO ANY PERSONS OR PROPERTY, WHETHER

DIRECT OR INDIRECT, AND WHETHER ARISING IN

CONTRACT OR IN TORT.

Some states do not allow the limitation or exclusion of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

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

Fill out and keep with water heater.

IMPORTANT INFORMATION

Model Number____________________________________________

Serial Number_____________________________________________

Installation Information:

Any accident to the water heater or any part thereof (including freezing, fire, floods, or lightning), any misuse, abuse or alteration of it, any operation of it in a modified form, or any attempt to repair tank leaks or parts, will void this warranty.

Date Installed _____________________________________________

Company’s Name _________________________________________

Street or P.O. Box _________________________________________

SERVICE AND LABOR RESPONSIBILITY

UNDER THIS 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:

City, State, and Zip Code ___________________________________

Phone Number _______________Plumber’s Name_______________

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