General Safety; Time/Temperature Relationships In Scalds - Rheem Raypak MVB 503A Installation And Operation Manual

2. GENERAL SAFETY

NOTE:
When this
general purpose hot water 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 information.
A CAUTION: Hotter water increases the risk of
scalding! There is a hot water scald potential if the
thermostat is set too high.
To meet commercial hot water use needs, the high limit
safety control on this water heater will shut off the main gas
valve before the outlet temperature reaches 210°F (99°C).
However, water temperatures over 125°F (52°C) can
cause instant severe burns or death from scalds. When
supplying general-purpose hot water, the recommended
initial setting for the temperature control is 125°F (52°C).
This section applies to Hot Water Supply Boilers and Hot
Water Heaters ONLY. For sanitary rinse applications where
outlet temperatures of 180°F to 195°F (82°C to 91°C) are
required, a boiler is recommended since the 210°F (99°C)
limit on water heaters will NOT allow the heater to maintain
these desired sanitary rinse temperatures.
Safety and energy conservation are factors to be
considered when setting the water temperature on the
thermostat. The most energy-efficient operation will result
when the temperature setting is the lowest that satisfies
the needs of the application.
Water temperature over 125°F (52°C) can cause instant
severe burns or death from scalds. Children, disabled and
elderly are at highest risk of being scalded.
• Feel water before bathing or showering.
• Temperature limiting valves are available.
Maximum water temperatures occur just after the heater's
burner has shut off. To determine the water temperature
being delivered, turn on a hot water faucet and place
a thermometer in the hot water stream and read the
thermometer.
Time/Temperature
Relationships in Scalds
For 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, see Table A.
The temperature of the water in the storage tank can be
regulated by using the VERSA IC
with safety regulations, the control is set at 125°F (52°C)
when shipped from the factory.
To adjust the water temperature, follow the instruction for
the operation of the controls starting on page 31 of this
manual.
water heater is supplying
®
Control. To comply
Water Temp.
120°F (49°C)
125°F (52°C)
130°F (54°C)
135°F (57°C)
140°F (60°C)
145°F (63°C)
150°F (66°C)
155°F (68°C)
Table courtesy of The Shriners Burn Institute
Table A. Time to Produce Serious Burn
Water temperature over 125°F can
cause instant severe burns 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 show-
ering.
Temperature limiting valves are
available, see manual.
Time to Produce Serious Burns
More than 5 minutes
1-1/2 to 2 minutes
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1-1/2 seconds
About 1 second
5