Raypak 090A - Manual (Page 5)

5
GENERAL SAFETY
To meet commercial hot water requirements, the tank-
stat is adjustable up to 190°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 gen-
eral purpose hot water.
Safety and energy conservation are factors to be con-
sidered when setting the water temperature on the
tankstat. The most energy efficient operation will result
when the temperature setting is the lowest that satis-
fies the needs consistent with the application.
Maximum water temperatures occur just after burner
has shut off. To find hot water temperature being deliv-
ered, turn on a hot water faucet and place a
thermometer in the hot water stream and read the
thermometer.
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.
Table A 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 storage tank boil-
er can be regulated by setting the temperature dial on
front of the tankstat. To comply with safety regulations,
the tankstat was set at its lowest setting before ship-
ment from the factory.
Fig. 1 illustrates the tankstat. To adjust the water tem-
perature, insert a small straight screwdriver into slotted
screw in hole in front of tankstat and turn wheel to
desired setting. Thermostat is adjustable up to 190°F.
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.
Table A: Time to Produce Serious Burn
Fig. 1: Tankstat Adjustment