Typical installation, Danger – Reliance Water Heaters 317775-000 User Manual

Page 9

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9

tYpIcal InstallatIon

MIXInG valves

DANGER

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.

Water heated to a temperature which will satisfy clothes washing, dish

washing, and other sanitizing needs can scald and cause permanent

injury upon contact. Short repeated heating cycles caused by small

hot water uses can cause temperatures at the point of use to exceed

the water heater’s temperature setting by up to 20°F (11°C).
Some people are more likely to be permanently injured by hot water

than others. These include the elderly, children, the infirm and the

physically/mentally disabled. Table 1 shows the approximate time-

to-burn relationship for normal adult skin. If anyone using hot water

provided by the water heater being installed fits into one of these

groups or if there is a local code or state law requiring a certain

water temperature at the point of use, then special precautions

must be taken.
In addition to using lowest possible temperature setting that satisfies demand

of application a Mixing Valve should be installed at water heater (see Figure

3) or at hot water taps to further reduce system water temperature.

Mixing valves are available at plumbing supply stores. Consult a

Qualified Installer or Service Agency. Follow mixing valve manufacturer’s

instructions for installation of the valves.

taBle 1.

Water Temperature

Time to Produce 2nd & 3rd

Degree Burns on Adult Skin

180°F (82°C)

Nearly instantaneous

170°F (77°C)

Nearly instantaneous

160°F (71°C)

About 1/2 second

150°F (66°C)

About 1-1/2 seconds

140°F (60°C)

Less than 5 seconds

130°F (54°C)

About 30 seconds

120°F (49°C)

More than 5 minutes

HOT WATER

OUTLET

TO TANK

INLET

CHECK

VALVE

MIXING

VALVE

COLD

WATER

INLET

TEMPERED WATER

OUTLET

12” TO 15”

(30-38 cm)

CHECK

VALVE

fIGure 3

.

fIGure 2.

MIXInG valve / therMal eXpansIon tanK usaGe and space heatInG

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