16
hIGh teMperature lIMIt controls (eco)
This water heater is equipped with an ECO (energy cut off) non
adjustable high temperature limit control. 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:
The ECO high temperature limit switch is located inside the immersion
temperature probe (two red wires). The ECO switch contacts will open
when the water temperature reaches approximately 202°F/94°C and
close at approximately 120°F/49°C. 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.
Figure 2 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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fIGure 2.
teMperature reGulatIon