A.O. Smith ***81-199 Specifications download pdf (Page 20)

6.Check main burner operation by cycling on and off the

thermostat dial several times. Wait 1 minute between cycles for

regulators and sequencing to reset.

7. When all adjustments are satisfactory:

• Fill in part no. 170037 “Start-up” form.

• Adjust thermostat temperature dial to deliver desired

water temperature at point of use.

• For subsequent normal starting and shutoff procedure,

see OPERATIONAL PROCEDURE.

MAINTENANCE

MAINTENANCE SCHEDULE

Water heater maintenance includes periodic tank flushing and

cleaning, and removal of lime scale. The power burner should

be inspected and adjusted to maintain proper combustion. Refer

to table 7. A periodic inspection of the venting system and

barometric damper should be made. Where used, the water

heating system circulating pump should be oiled.

Following are the instructions for performing some of the

recommended maintenance. Power burner inspection and

adjustment should be performed by a competent technician.

TABLE 7

RECOMMENDED MAINTENANCE SCHEDULE

FOR THE ***81-140 THRU ***81-370 HEATER

COMPONENTS OPERATION INTERNAL REQUIRED

Flushing Monthly

Sediments

Tank Removal Semi-Annually

Lime Scale Un•Lime

Removal As Required Delimer

Relief Valve Inspect Semi-Annually

Circulating Pump SAE No. 20

and Power Oiling Quarterly Non-Detergent

Burner Motor(1) Motor Oil

Power Burner Combustion Test

and Ignition Inspection Kit and Test

Device (2) and Adjustment Semi-Annually Specifications

Main Burner Inspect Semi-Annually

Vent System and

Barometric Draft

Damper Inspect Semi-Annually Gauge

Anode(s) Inspect Annually

FLUSHING

1. Turn off the heater electrical disconnect switch.

• For convenience, the switch on the outside of the control

compartment can be used.

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 heater electrical disconnect switch.

DRAINING

The 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 heater electrical disconnect switch.

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.

Reverse these instructions when restoring hot water service.

SEDIMENT REMOVAL

Waterborne 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. 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.

Lime accumulation not only reduces the life of the equipment

but also reduces efficiency of the heater and increases fuel

consumption.

The usage of water softening equipment greatly reduces the

hardness of the water. However, this equipment does not always

remove all of the hardness (lime). For this reason it is

recommended that a regular schedule for deliming be

maintained.

The depth of lime build-up should be measured periodically.

Heaters will have about 3" of lime build-up when the level of lime

has reached the bottom of the cleanout opening or about 1" of

lime build-up if it has reached the drain valve opening. A schedule

for deliming should be set up, based on the amount of time it

would take for a 1" build-up of lime.

Example 1:Initial inspection, six months after installation, shows

1/2" of lime accumulation. Therefore, the heater can be

delimed once a year.

Example 2:Initial inspection, six months after installation, shows

2" of lime accumulation. Therefore, the heater should

be delimed every 3 months.

Sediment and lime scale removal may be accomplished through

the cleanout opening furnished on the heater, see DRAIN VALVE

AND ACCESS PANELS. The heater must be drained, see

DRAINING, before removing cleanout cover on tank.

To dissolve and remove the more stubborn mineral deposits,

UN•LIME

Professional Delimer should be used.

UN•LIME Delimer is an easy-to-handle patented food grade acid

formulated specifically for lime scale removal from all types of

water using equipment. Available in 1 gallon (part no. 4763) and

5 gallon (part no. 4813) sizes. Hydrochloric base acids are not

recommended for use on glass-lined tanks.

Form No. 4800, entitled “Why, When and How”, describes tank

cleaning methods and materials. UN•LIME and the booklet may

be obtained through your dealer or distributor.

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A.O. Smith ***81-199 Specifications Page 20

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