A.O. Smith ATX-199 Instruction Manual page 15

Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
Figure 7 (page 15).
Table 5. Burn Time At Various Temperatures
Water Temperature Time for 1st Degree Burn
°F (°C) (Less Severe Burns)
110 (43)
116 (47)
116 (47)
122 (50)
131 (55)
140 (60)
149 (65)
154 (68) instantaneous
DISH-WASHING MACHINES
Foundation
Table 5
The National Sanitation Foundation
Diagrams (page 66).
NOTE:
CLOSED WATER SYSTEMS
iBurns
2nd & 3rd Degree
(Most Severe Burns)
THERMAL EXPANSION
National Sanitation
15
HOT WATER
OUTLET
12" TO 15"
(30-38 cm)
TEMPERED WATER
OUTLET
COLD
WATER
INLET
MIXING
CHECK
VALVE
VALVE
TO TANK
INLET
Figure 7. Mixing Valve
NSF Standard 5
CHECK
VALVE
Water Piping