Raypak 0133-4001 WH, NH manual TIME/TEMPERATURE Relationships in Scalds, Scalding

General Safety Precautions

To meet commercial water use needs, the thermostat on this water heater is adjustable up to 190°F. How- ever, water temperatures over 125 °F can cause in- stant severe burns or death from scalds. This is the preferred temperature setting when supplying general purpose hot water.

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 consistent with the application.

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.

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.

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 Shriners Burn Institute

TIME/TEMPERATURE RELATIONSHIPS IN SCALDS

The temperature of the water in the heater can be regulated by setting the temperature dial on the front of the thermostat. To comply with safety regulations, the thermostat was set at its lowest setting before the heater was shipped from the factory. The illustration below shows how to adjust the water temperature using the thermostat.

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 190°F.

CAUTION!! - Hotter water increases the risk of

SCALDING!

Feel water before bathing or show- ering.

Temperature limiting valves are available, see manual.

Maximum water temperatures occur just after burner has shut-off. To determine the water temperature being delivered, turn on the hot water only, place a thermometer in the stream, and read the thermom- eter.

There is a hot water scald potential if the thermostat is set too high.

NOTE: When this heater is supplying general purpose hot water requirements for use by individuals, a ther- mostatically 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.

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