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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.

MAIN BURNER

Check main burner every 12 months for proper flame
characteristics.  This is done by removing door(s) on heater,
see Figure 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-UP INDICATES 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 control switch to “OFF” position and allow the burner to
cool.  Remove the burner and clean with a soft brush.  Clean
main burner orifice with a suitable soft material.

HIGH TEMPERATURE LIMIT SWITCH

The thermostat has a single use built-in limit switch which will
shut off gas to burner in case of excessive water temperatures.
The thermostat must be replaced if the limit switch opens.

VENTING SYSTEM

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

A.

Insofar as is practical, close all doors, windows and air inlets
to the building.  Turn on all exhaust fans (range hood,
bathroom exhaust, etc.) so they will operate at their maximum
speed.  Close fireplace dampers.

B. Turn water temperature adjusting knob to full,

counterclockwise and open water faucet if necessary to keep
burner in operation.

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

several minutes and check to see if it is venting properly by
passing a lit match or paper near the opening of the Air
Mixing Box, see Figure 11. If the draft is proper, the match
flame will be drawn into the Air Mixing Box.  If not, the
combustion products will tend to extinguish the flame.  If an
improper draft exists, do not operate the water heater until
proper adjustments or repairs are made to provide adequate
draft through the gas vent.

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

same room so they will operate at their full input.

Repeat step C above.

POWER VENTER MAINTENANCE

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

1. MOTOR - Motor must rotate freely.  This is a sealed motor

and no oiling is required.

2. WHEEL - Wheel must be clean of soot, ash or any other

coating which inhibits either rotation or air flow.  Remove all
foreign material from vent system before operating.

3. AIR SUPPLY BOX - Every month check operation and make

sure nothing is blocking dilution air entrance.

4. The pressure switch part inside the power venter must be

open and free from deposits of soot, carbon, etc.

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

FIGURE 11

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

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

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

Summary of Contents for FPSH-75

Page 1: ...ing instructions as well as the WARNING and CAUTIONS CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE RESIDENTIAL GAS WATER HEATERS OWNER S MANUAL ADIVISION OFA O SMITH CORPORATION www hotwater com GET TO KNOWYOUR WATER HEATER 2 GENERAL SAFETY INFORMATION 3 4 INSTALLATION 4 12 OPERATION 12 14 MAIN...

Page 2: ...ased locally FPSH 75 with Hot Surface Ignition GET TO KNOW YOUR WATER HEATER A VENT PIPE B ANODE C HOT WATER OUTLET D OUTLET 120 VAC E FLUE BAFFLE F GASSUPPLY G MAINMANUALGAS 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 TEMPERATUREAND PRESSURE RELIEF VALVE Q EMBLEMANDRATINGPLATE R INSULATION S VENT TERMINAL T...

Page 3: ... 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 ...

Page 4: ...closet having minimum clearances from combustible material of 0 clearance from sides and rear 5 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 A minimum clearance of 4 must be allowed for access to replaceable parts such as the thermostats drain valve and relief v...

Page 5: ...e must be installed Please refer to Figure 2 for suggested piping arrangement FIGURE2 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...

Page 6: ... manual or on water heater With main burner in operation paint pipe joints including flanges pilot gas tubing connections and control inlet and outlet with rich soap and water solution Bubbles indicate gas leak To stop leak tighten flange screws joints and pipe connections Replace part if leak can t be stopped DISCONNECT THE APPLIANCE AND ITS INDIVIDUAL SHUT OFF VALVE FROM THE GAS SUPPLY PIPING SY...

Page 7: ...erving 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 INSTALLATION OF VENT SYSTEM and with the National Fuel Gas Code and local codes PLANNING THE VENT SYSTEM Plan the route of the vent system from the discharge of the blower to the...

Page 8: ...nt terminal by using the cover plate as a template to mark the hole for the vent pipe to pass through the wall BEWARE OF CONCEALED WIRING AND PIPING INSIDE THE WALL 2 If the Vent Terminal is being installed on the outside of a finished wall it may be easier to mark both the inside and outside wall Align the holes by drilling a hole through the center of the template from the inside through to the ...

Page 9: ...sure E Splice field wiring into existing wiring using code authorized method wire nuts etc F Be certain that neutral and line connections are not reversed when making these connections G Ground heater properly This water heater must be grounded on accordance with the National Electric Code ANSI NPA70 and or local codes These must be followed in all cases The water heater must be connected to a gro...

Page 10: ...be supported every 5 feet of vertical run and every 3 feet of horizontal run All piping and fittings must be joined by the proper procedures as described under VENT PIPE PREPARATION FIGURE9 IMPORTANT The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the National Fuel Gas Code ANSI Z223 1 and as listed below 1 Vent Termination m...

Page 11: ... type of cutter is used the flare on the end must be completely removed STEP A NOTE Power saws should be specifically designed to cut plastic pipe 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 t...

Page 12: ...uld 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 STEPG OPERATION WARNING DO NOTATTEMPTTO OPERATE WATER HEATER W...

Page 13: ...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 OPERATINGINSTRUCTIONS 1 STOP Read the safety information above on this label 2 Set the thermostat to the lowest setting 3 Turn the ON OFF switch on the b...

Page 14: ...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 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 plumb...

Page 15: ...NG THE DRAFT Operate the water heater for several minutes and check to see if it is venting properly by passing a lit match or paper near the opening of the Air Mixing Box see Figure 11 If the draft is proper the match flame will be drawn into the Air Mixing Box If not the combustion products will tend to extinguish the flame If an improper draft exists do not operate the water heater until proper...

Page 16: ... heater requires no special care other than the normal maintenance as noted above If you are having a problem with your water heater before calling for service please refer to the following TROUBLESHOOTING sections If service becomes necessary contact your dealer installer or an authorized service agent Do not attempt to repair the water heater yourself Any work performed by unauthorized personnel...

Page 17: ...into 115 vac outlet Repair service to outlet Replace switch Replace control harness Replace blower and motor Replace switch Check for low voltage less than 102 vac have service checked and repaired If voltage is above 102 vac make sure there is not more than 30 Equivalent feet of 3 inch pipe or85 equivalent feet of 4 inch pipe installed or vent terminal blockage If at least 102 vac less than 30 eq...

Page 18: ...e water heater off for 10 seconds and then back on 2 Replace gas control valve Problem with the internal circuit 1 Turn power to the water heater off for 10 seconds and then back on 2 Replace gas control valve Problem with the internal circuit 1 Turn power to the water heater off for 10 seconds and then back on 2 Replace gas control valve Flame signal sensed out of 1 Replace gas control valve prop...

Page 19: ...rnish 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 ONLYTHE UNEXPIRED PORTION OFTHE ORIGINAL WARRANTY The warranty period will be determined by the ori...

Page 20: ...20 A O SMITH WATER PRODUCTS CO INC 5621 W 115TH STREET ALSIP ILLINOIS 60803 PHONE 1 800 433 2545 FAX 1 800 433 2515 www hotwater com E MAIL parts hotwater com ...

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