7
hIGh tEMpEraturE lIMIt Controls (ECo)
This water heater is equipped with an ECO (energy cut off).
This switch is adjustable, up to 190 degree F. An ECO is a
normally closed switch that opens (activates) on a rise in
temperature. If the ECO switch contacts open (activate) due
to abnormally high water temperatures the control system
will lock-out and disable further heating element operation.
It is important that a qualified service agent be contacted to
determine the reason for the ECO activation before resetting
the ECO. Once the reason has been determined and corrected
the ECO can be reset as follows:
When the ECO switch contacts open (activate) the electronic
control system locks out and displays a Fault message. Voltage to
the contactor coils and heating elements is terminated to prevent
further heating operation. Should the ECO activate, the water
temperature must drop below 120°F/49°C before the control
system can be reset. Once the water temperature has cooled
below this point the power supply to the water heater must be
turned off and on again to reset the control system.
thErMostat Controls
The water heaters covered in this instruction manual are equipped
with adjustable thermostat controls to control water temperature. Hot
water temperatures required for automatic dishwasher and laundry
use can cause scald burns resulting in serious personal injury and/
or death. The temperature at which injury occurs varies with the
person’s age and duration of exposure. The slower response time
of children, the elderly or disabled persons increases the hazards
to them. Never allow small children to use a hot water tap or
draw their own bath water. Never leave a child or disabled person
unattended in a bathtub or shower. The water heater should be
located in an area where the general public does not have access
to set temperatures.
Setting the water heater temperatures at 120°F will reduce the
risk of scalds. Some States require settings at specific lower
temperatures.
The following table shows the approximate time-to-burn relationship
for normal adult skin.
tEMpEraturE adjustMEnt
The water heaters covered in this instruction manual are equipped
with an electronic control system. The control system senses
temperature from a factory installed immersion temperature probe
– see the Features and Components illustrations at the beginning
of this manual for location. The “Operating Set Point” is adjusted to
control water temperature. This is an adjustable user setting in the
control system’s “Temperatures Menu.” This and all control system
menus are accessed through the UIM (User Interface Module - see
Figure 2) located on the front panel of the water heater.
The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C.
The factory setting is 120°F/49°C. See the Control System Operation
section of this manual for instructions on how to adjust the Operating
Set Point and other user settings.
Set the Operating Set Point at the lowest setting which produces an
acceptable hot water supply. This will always give the most energy
efficient operation.
Water Temperature
Time to Produce 2nd & 3rd Degree
Burns on Adult Skin
180°F (82°C)
160°F (71°C)
150°F (66°C)
140°F (60°C)
130°F (54°C)
120°F (49°C)
80°F (27°C)
Nearly Instantaneous
About 1/2 second
About 1-1/2 seconds
Less than 5 seconds
About 30 seconds
More than 5 minutes
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tEMpEraturE rEGulatIon
