American International PG10*34-150-2NV or 2PV Manual Do Utilizador

25

Stacking occurs when a series of short draws of hot water 
(3 gallons or less) are taken from the water heater tank. 
This causes increased cycling of the burner and can result 
in increased water temperatures at the hot water outlet. A 
tempering valve must be installed in the hot water supply 
line to reduce the risk of scald injury.

The thermostat is adjusted to its lowest temperature setting 
when it is shipped from the factory. Water temperature 
can be regulated by moving the temperature dial to the 
preferred setting.  The preferred starting point is 130°F; 
however, in some instances, setting the water heater higher 
than 130°F can reduce the occurrence of igniter failure due 
to excessive condensate.

Important:  A tempering valve (provided) must be installed 
in the hot water outlet to reduce the risk of scald injury 
when setting the thermostat in excess of 120°F.

Many home heating systems used with this water heater 
are designed for temperatures higher than 130°F. Refer to 
the manufacturer’s instruction manuals supplied with this 
type of equipment for recommended temperature settings.   

Important:  Adjusting the thermostat past the 120°F setting 
on the temperature dial (see figure 22) will increase the 
risk of scald injury. Hot water can 
produce first degree burns within:
120°F (49°C) more than 5 minutes
130°F (54°C) at 20 seconds 
140°F (60°C) at 3 seconds
150°F (66°C) at 1-1/2 seconds 
160°F (71°C) at less than 1 second

Important: If overheating occurs or 
the gas supply fails to shut off, close 
the manual gas supply valve.  Turn off the electrical supply to 
the unit and close the cold water supply valve.  Do not operate 
the water heater again until it has been thoroughly checked by 
an authorized service technician.