A.O. Smith COF-199 THRU 700A Specifications download pdf (Page 12)

DRAINING

The water heater must be drained if it is to be shut down and exposed to

freezing temperatures. Maintenance and service procedures may also

require draining the heater.

1. Turn off the oil burner electrical disconnect switch.

• If required by the reason for draining the heater, turn off the oil

line supply valve.

2. Close the cold water inlet valve to heater.

3. Open a nearby hot water faucet to vent the system.

4. Open the heater drain valve.

5. If the heater is being drained for an extended shutdown, it is suggested

the drain valve be left open during this period.

• Follow FILLING instructions when restarting hot water service.

MAINTENANCE

GENERAL

Water heater maintenance includes periodic tank flushing and cleaning, and

removal of lime scale. The oil burner should be inspected and adjusted to

maintain proper combustion. Where used, the water heating system circulating

pump should be oiled (See table 9).

The depth of lime buildup should be measured periodically. Heaters will have

about 2" (50.8 mm) of lime buildup when the level of lime has reached the

bottom of the cleanout opening or about 1" of lime buildup if it has reached the

drain valve opening. A schedule for deliming should be setup, based on the

amount of time it would take for a 1" (25.4 mm) buildup of lime.

Example 1: Initial inspection shows 1/2" (12.7 mm) of lime accumulation.

Therefore, the heater can be delimed once a year.

Example 2: Initial inspection shows 2" (50.8 mm) of lime accumulation.

Therefore, the heater should be delimed every 3 months.

Following are the instructions for performing some of the recommended

maintenance. Oil burner inspection and adjustment should be performed by a

competent technician.

TABLE 9 SUGGESTED MAINTENANCE SCHEDULE

Semi-

Relief Valve Lift Lever Annually

Flushing Monthly

Sediment Semi-

Removal Annually

Anode Semi

Tank

Inspection Annually

Lime Scale As UN•LIME

Removal Required Delimer

Circulating Four SAE No. 20 non-detergent

Pump Oiling Months motor oil

Inspection Combustion test

and Semi- kit & test specifications

Oil Burner

Adjustment Annually (Page 26)

Nozzle Semi-

Replacement Annually New Nozzle

Flue Baffle

Pipe Cleaning Annually Wire Brush

Venting Semi-

System Inspected Annually

* Replacement gasket, A.O. Smith Part No. 99038

RELIEF VALVES

At least twice a year, the system relief valves should be checked to

ensure that they are in operating condition. To check a relief valve, lift the

lever at the end of the valve several times. The valve should seat properly

and operate freely.

If water does not flow, remove the valve and inspect for obstructions or

corrosion. Replace with a new valve of the recommended size as necessary.

Inspection of the valve should be performed at least every three years. Do not

attempt to repair the valve, as this could result in improper operating and a tank

explosion. In areas with poor water conditions, it may be necessary to inspect

the T&P valve more often than twice a year.

DANGER

BEFORE MANUALLY OPERATING A RELIEF VALVE, MAKE SURE THAT

DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE

DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION

COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT

OF THE VALVE DURING THIS CHECK OPERATION.

If the temperature and pressure relief valve on the heater discharges

periodically or continuously, it may be due to thermal expansion of water

in a closed water supply system, or it may be due to a faulty relief valve.

Thermal expansion is the normal response of water when it is heated. In

a closed system, thermal expansion will cause the system pressure to

build until the relief valve actuation pressure is equaled. Then, the relief

valve will open, allowing water to escape, slightly lowering the pressure.

Your water supplier or local plumbing inspector will know how to best

correct this situation. Two common corrections are listed in the Checklist

and Service Information which appears later in this manual.

ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF

VALVE. THIS IS NOT A SOLUTION AND CAN CREATE A HAZARDOUS

SITUATION.

FLUSHING

1. Turn off the oil burner electrical disconnect switch.

2. Open the drain valve and allow water to flow until it runs clean.

3. Close the drain valve when finished flushing.

4. Turn on the oil burner electrical disconnect switch.

SEDIMENT REMOVAL

Water borne impurities consist of fine particles of soil and sand which

settle out and form a layer of sediment on the bottom of the tank.

For convenience, sediment removal and lime scale removal should be

performed at the same time.

LIME SCALE REMOVAL

The amount of calcium carbonate (Lime) released from water is in

direct proportion to water temperature and usage, see chart. The higher

the water temperature or water usage , the more lime deposits are

dropped out of the water. This is the lime scale which forms in pipes,

heaters and on cooking utensils.

WATER USAGE IN GALLONS PER DAY POUNDS OF LIME

DEPOSITED VS. TEMPERATURE AND WATER USAGE

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 55 56

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A.O. Smith COF-199 THRU 700A Specifications Page 12

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