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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 technician or qualified agency 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.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
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.
Table 5 shows the approximate time-to-burn relationship for
normal adult skin.
TEMPERATURE REGULATION
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 illustrations in "Features and Components" on page 7
for the 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 User Interface Module (UIM) located on
the front panel of the water heater. See Figure 9.
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 "Control
System Operation" on page 18 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.
17
Electrical Shock Hazard
Full power is present whenever the
cabinet door is opened, even with
the pilot switch turned off.
Figure 9. User Interface Module (UIM) Desktop Screen
Table 5. Burn Time at Various Temperatures
Water Temperature
Time for 1st Degree Burn
°F (°C)
(Less Severe Burns)
110 (43)
(normal shower temp.)
116 (47)
(pain threshold)
116 (47)
35 minutes
122 (50)
1 minute
131 (55)
5 seconds
140 (60)
2 seconds
149 (65)
1 second
154 (68)
instantaneous
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)
Time for Permanent
Burns
2nd & 3rd Degree
(Most Severe Burns)
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 second
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