Time/Temperature Relationships In Scalds; General Safety Precautions - Rheem 136-1826 Operating And Installation Manual

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To meet commercial water use needs, the thermostat on
this water heater is adjustable up to 210°F. However,
water temperatures over 125°F. can cause severe burns
instantly or death from scalds. This is the preferred
starting point for setting the control for supplying general
purpose hot water.
Safety and energy conservation are factors to be consid-
ered when setting the water temperature on the thermo-
stat. The most energy efficient operation will result when
the temperature setting is the lowest that satisfies the
needs consistent with the application.
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are at
highest risk of being scalded.
See instruction manual before set-
ting temperature at water heater.
Feel water before bathing or shower-
ing.
Temperature limiting valves are
available, see manual.
Maximum water temperatures occur just after burner has
shut off. To find hot water temperature being delivered,
turn on a hot water faucet and place a thermometer in the
hot water stream and read the thermometer.

General Safety Precautions

The following chart details the relationship of water
temperature and time with regard to scald injury and may
be used as a guide in determining the safest water
temperature for your applications.

TIME/TEMPERATURE RELATIONSHIPS IN SCALDS

The temperature of the water in the water heater can be
regulated by setting the temperature dial on front of the
thermostat. To comply with safety regulations the
thermostat was set at its lowest setting before the water
heater was shipped from the factory. The illustration
below illustrates the thermostat and how to adjust the
water temperature.
There is a Hot Water SCALD Potential if the thermostat
is set too high.
NOTE: When this water heater is supplying general
purpose hot water requirements for use by individuals, a
thermostatically controlled mixing valve for reducing
point of use water temperature is recommended to
reduce the risk of scald injury. Contact a licensed
plumber or the local plumbing authority for further infor-
mation.
30
Temperature
Time to Produce Serious Burn
120°F.
More than 5 minutes
125°F.
1-1/2 to 2 minutes
130°F.
About 30 seconds
135°F.
About 10 Seconds
140°F.
Less than 5 seconds
145°F.
Less than 3 seconds
150°F.
About 1-1/2 seconds
155°F.
About 1 second
Table courtesy of Shiners Burn Institute
To adjust the water tem-
perature, insert a small
straight screwdriver into
slotted screw in hole in front
of thermostat and turn
wheel to desired setting.
Thermostat is adjustable up
to 210°F.
CAUTION!! - Hotter water
increases the risk of
SCALDING!
!
DANGER

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