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HIGH TEMPERATURE LIMIT CONTROLS (ECO)
If a HWL L4008A series high limit is used in place of the ECO in
the probe it (HWL L4008A) should not be set above 190°F/88°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.
DANGER
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 REGULATION
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.
Read instruction manual for safe
temperature setting.
TEMPERATURE ADJUSTMENT
Full power is present whenever the
cabinet door is opened even with
the pilot switch turned off.
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)
located on the front panel of the water heater. See Figure 1.
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.
FIGURE 1. UIM (User Interface Module).
Water
Time for 1st Degree Burn
Temperature °F
(Less Severe Burns)
110
(normal shower temp.)
116
(pain threshold)
116
35 minutes
122
131
5 seconds
140
2 seconds
149
154
instantaneous
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
19
DANGER
Time for Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
45 minutes
1 minute
5 minutes
25 seconds
5 seconds
1 second
2 seconds
1 second
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