A.O. Smith FPD SEALED SHOT Owner's Manual page 17

Residential gas water heaters with hot surface ignition and smart valve
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DISCONNECT FROM ELECTRICAL SUPPLY BEFORE
SERVICING UNIT.
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.
MAIN BURNER
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.
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.
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 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.
HIGH TEMPERATURE LIMIT SWITCH
(Single-Use Type 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
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MAINTENANCE
WARNING
WARNING
and thus avoid repeated thermostat replacement. Lower the
temperature adjustment dial setting on new control.
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HAVE VENTING SYSTEM CHECKED EVERY SIX MONTHS FOR
OBSTRUCTIONS AND/OR DETERIORATION IN VENT PIPING.
POWER VENTER MAINTENANCE
The "SEALED SHOT" venter must be inspected four times a year.
Points of inspection are:
1.
MOTOR - Motor must rotate freely. Oil every three months
of operation with 4 drops of SAE 20 oil.
2.
WHEEL - Wheel must be clean of soot, lint, ash 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 soot, carbon, etc.
For safety and satisfactory operation it is recommended that the
heater be checked once a year by a competent service person.
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.
THE WATER PASSING OUT OF THE VALVE DURING THIS
CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID
CONTACT AND DISCHARGE SAFELY TO PREVENT WATER
DAMAGE.
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 WATER AWAY.
DANGER: The water CAN BE
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.
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.
17
VENTING SYSTEM
T & P VALVE
DANGER
DRAINING
HOT.

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