Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 16)

16
Temperature Adjustment
The tank thermostat controls the maximum water temperature in the water
heater. If it is set too high, the resulting hot water can cause painful scalding
with possible serious and permanent injury. The temperature at which this
occurs varies with a person’s age, and the length of time in contact with the
hot water. The slower response time of infants, older, or handicapped people
increases the hazard for them.
It is recommended that the thermostat be set for the lowest possible
temperature that satisfies your needs. This will also provide you with the
lowest energy consumption and cost.
Check the water temperature at a hot water faucet soon after the tank
thermostat has satisfied, and the circulator and the boiler have turned off.
Adjust as needed.
Lowering the thermostat setting will not have an immediate effect on the
water temperature because the stored water will have to be used and the
thermostat must go through the cycle of heating cold water and satisfying at
the new, lower temperature. Additional temperature checks should follow the
completion of a heating cycle. Further adjustments may be required after you
have used the water heater.
The table below details the approximate 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.
Hot Water Can Scald!
Water heated to temperature for
clothes washing, dish washing and
other sanitizing needs can scald
and cause permanent injury.
Children, elderly, and infirm or
physically handicapped persons
are more likely to be permanently
injured by hot water. Never leave
them unattended in bathtub or
shower. Never allow small children
to use a hot watertap or draw their
own bath.
If anyone using hot water in the
building fits the above description,
or if state laws or local codes
require certain water temperatures
at hot water taps, you must take
special precautions:
• Use lowest possible temperature
setting.
• Install some type of tempering
device, such as an automatic
mixing valve, at hot water tap
or water heater. Automatic
mixing valve must be selected
and installed according to
manufacturer's recommendations
and instructions.
Water passing out of drain valves
may be extremely hot. To avoid
injury:
• Make sure all connections are
tight.
• Direct water flow away from any
person.
Approximate Time/Temperature
Relationships in Scalds
120°F (52°C) More than 5 Minutes
125°F (52°C) 1½ to 2 Minutes
130°F (54°C) About 30 Seconds
135°F (57°C) About 10 Seconds
140°F (60°C) Less Than 5 Seconds
145°F (63°C) Less Than 3 Seconds
150°F (66°C) About 1½ Seconds
155°F (68°C) About 1 Second
The scald label show to the right can be found on all Indirect
Water Heaters and Storage tanks. Take note and use caution when
adjusting the temperature settings with your water system. Be sure
to always feel the water before bathing or showering, especially
when drawing a bath for an infant or elder.