Whirlpool 12307 ユーザーズマニュアル

20

It is recommended that the tank be drained and flushed 
every 6 months to remove sediment which may build up 
during operation. The water heater should be drained if 
being shut down during freezing temperatures. To drain the 
tank, perform the following steps:

1.  Turn off the gas to the water heater at the manual gas 

shut-off valve.

2.  Close the cold water inlet valve.

3.  Open a nearby hot water faucet.

4.  Connect a hose to the drain valve and terminate it to an 

adequate drain.

NOTE: The drain hose should be rated for at least 200°F. 
If the drain hose does not have this rating, open the cold 
water inlet valve and a nearby hot faucet until the water is 
no longer hot.

5.  Open the water heater drain valve and allow all the 

water to drain from the tank. Flush the tank with water 
as needed to remove sediment.

6.  Close the drain valve, refill the tank, and restart the 

heater as directed under “Operating Your Water 
Heater”.

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

IMPORTANT: Condensation may occur when refilling the 
tank and should not be confused with a tank leak.

At least annually, a visual inspection should be made of 
the venting and air supply system, piping systems, main 
burner, pilot burner, and flame-trap. Check the water heater 
for the following:

• 

Obstructions, damage, or deterioration in the venting 
system. Make sure the ventilation and combustion air 
supplies are not obstructed. 

• 

Build up of soot and carbon on the main burner and 
pilot burner. Check for a soft blue flame.

• 

Leaking or damaged water and gas piping.

• 

Presence of flammable or corrosive materials in the 
installation area.

• 

Presence of combustible materials near the water 
heater.

• 

After servicing this water heater, check to make sure it 
is working properly. (See Operating Your Water Heater 
section of this manual.)

IMPORTANT: If you lack the necessary skills required to 
properly perform this visual inspection, you should not 
proceed, but get help from a qualified person.

Manually operate 
the temperature 
and pressure relief 
valve at least once 
a year to make 
sure it is working 
properly. To prevent 
water damage, 
the valve must be 
properly connected 
to a discharge line 
which terminates 
at an adequate 
drain. Standing clear of the outlet (discharged water may 
be hot), slowly lift and release the lever handle on the 
temperature and pressure relief valve to allow the valve to 
operate freely and return to its closed position. If the valve 
fails to completely reset and continues to release water, 
immediately shut off the manual gas control valve and the 
cold water inlet valve and call a qualified person.

Figure 21

Temperature and Pressure
Relief Valve

Manual Relief
Valve

Discharge line to drain

WARNING