American International PG10*50-130-2NV or 2PV Manual Do Utilizador

26

During the normal operation of the water heater, sounds or 
noises may be heard. These noises are common and may 
result from the following:

1.  Normal expansion and contraction of metal parts    

during periods of heat-up and cool-down.

2.  Sediment buildup in the tank bottom will create varying 

amounts of noise and may cause premature tank fail-
ure. Drain and flush the tank as directed under “Drain-
ing and Flushing”.

This water heater is equipped with a pressure switch that 
protects the unit by shutting it down in the event that:

•  A blockage occurs in the combustion air inlet, the    

flue gas exhaust outlet, or both the inlet and outlet.

•  The condensate line freezes and the condensate    

“backs up” and fills the exhaust outlet.

•  The blower fails to operate, or operates improperly.
•  The unit begins to operate at an abnormally low   

 input level.

A high temperature limit switch, or ECO, is used to shut down 
the water heater if the water temperature exceeds 203°F.  
The ECO will automatically reset when the temperature cools 
sufficiently.  If the ECO shuts down the heater repetitively, 
contact a qualified professional for service.

It is recommended that the tank be drained and flushed 
every 6 months to remove sediment which may buildup 
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 supply at the Manual Gas Shut-off  

 

Valve. Turn off the electrical supply to the water  

 

 heater

2. 

Close the cold water inlet valve.

3. 

Open a nearby hot water faucet.

4. 

Open the access door  at the bottom of the heater,  

 

then 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.  Close the cold water inlet valve.  
6.    Open the water heater drain valve and allow all      

the water to drain from the tank. 

7.  Flush tank to remove sediment 

Note: For water heaters with a hand hole clean-out follow 
steps 8-11. 

8.  Remove screw holding the outer hand hole clean-out 

cover. Then carefully remove the insulation covering 
the clean-out plug. Using a 1/2” square drive ratchet 
open the clean-out plug (see fi gure 23.) Note: After 
removing the clean-out plug inspect the O-ring for dam-
age, replace if necessary.

9.  Using a Wet/Dry shop vacuum clean any debris from 

the tank.

10.  Lubricate O-ring with a food grade oil. Then replace 

and securely tighten the clean-out plug.

11.  Replace the insulation and cover plate.
12.  Close the drain valve, replace access door, refi ll      

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.

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 (see figure 24). If the valve  
fails to completely reset and continues to release water, 
immediately shut off the manual gas valve and the cold 
water inlet valve, and call a qualified service technician.