AO Smith Commercial Gas Tank Water Heaters BL-80

DANGER: Burn hazard. Hot water discharge. Keep clear of Temperature-Pressure Relief Valve discharge outlet.

It is recommended that the Temperature-Pressure Relief Valve should be checked to ensure that it is in operating condition every 6 months.

When checking the Temperature-Pressure Relief Valve operation, make sure that no one is in front of or around the outlet of the Temperature-Pressure Relief Valve discharge line, and that the water discharge will not cause any property damage, as water may be extremely hot.

Use care when operating valve as the valve may be hot.

To check the temperature-pressure relief valve, lift the lever at the end of the valve several times. The valve should seat properly and operate freely.

If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater and drain the water heater.

Replace the Temperature- Pressure Relief Valve with a properly rated/sized new one.

If the Temperature-Pressure Relief Valve on the water heater weeps or discharges periodically, this may be due to thermal expansion.

NOTE: Excessive water pressure is the most common cause of Temperature-Pressure Relief Valve leakage. Excessive water system pressure is most often caused by “thermal expansion” in a “closed system.”

Turn off the gas supply at the Main Gas Shutoff Valve if the water heater is going to be shut down for an extended period.

Ensure the cold water inlet valve is open.

Open a nearby hot water faucet and let the water run until the water is no longer hot.

Close the cold water inlet valve to the water heater.

Connect a hose to the water heater drain valve and terminate it to an adequate drain.

Open the water heater drain valve and allow all the water to drain from the storage tank.

Close the water heater drain valve when all water in the storage tank has drained.

Close the hot water faucet opened in Step 4.

If the water heater is going to be shut down for an extended period, the drain valve should be left open.

Ensure the cold water inlet valve is open

Open a nearby hot water faucet and let the water run until the water is no longer hot. Then close the hot water faucet

Connect a hose to the drain valve and terminate it to an adequate drain

Ensure the drain hose is secured before and during the entire flushing procedure. Flushing is performed with system water pressure applied to the water heater

Open the water heater drain valve to flush the storage tank

Flush the water heater storage tank to remove sediment and allow the water to flow until it runs clean

Close the water heater drain valve when flushing is completed

Fill the water heater - see Filling The Water Heater in this manual

Warning: Handle all chemicals with care and follow the instructions on the label.

Enter the name of the deliming solvent used

Choose the quantity of UN•LIME ordered

Is this procedure being performed in Canada?

Note: UN•LIME is not available for use in Canada.

Was the handling instructions on the product label observed?

Sign off on the deliming procedure

Warning: Flood damage to a water heater may not be readily visible or immediately detectable. However, over a period of time a flooded water heater will create dangerous conditions which can cause DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE.

Contact a qualified installer or service technician to replace a flooded water heater. Do not attempt to repair the unit! It must be replaced!

Visual inspection of the main burner and pilot burner

Inspect burner flames through viewport. Flames should be very small with a blue haze and small amounts of yellow or orange at the edges. After several minutes of operation the burner screen may glow red.

Check for sooting. Soot is not normal and will impair proper combustion.

Soot build-up indicates a problem that requires correction before further use. Turn 'OFF' gas to water heater and leave off until repairs are made, because failure to correct the cause of the sooting can result in a fire causing death, serious injury, or property damage.

If inspection of the burner shows that cleaning is required, turn the gas control knob clockwise ( ) to the “OFF” position, depressing slightly.

NOTE: The knob cannot be turned from “PILOT” to “OFF” unless knob is depressed slightly. DO NOT FORCE.