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The water heater uses an optional adjustable
electronic temperature control to provide staged
ON/OFF control of the electric heating elements.
Operation is based on temperature input from an
immersion temperature sensor. The sensor is a
positive coefficient platinum thermistor.
sensor is placed in a well located above the
heating elements it is controlling. A liquid crystal
display is provided to indicate sensed temperature
and operating parameters.
control may operate in as many as four stages of
control. For more stages of operation, multiple
electronic temperature control sequencers are
installed and wired to operate in series.
FIG.
20
Electronic
Digital Display and Programming Keys
SPECIFICATIONS
Set Point Adjustment Range: Max setting
Temperature Accuracy: +/- 1° F.
Display Resolution: 1° F via Liquid Crystal
Display (LCD). Sensor: Thermistor 4.8 ohms/° F.
Operating Humidity: 5 - 95% RH
Operating Ambient Temperature: -30° to 125° F.
The temperature
125
1 2 3 4
Temperature
Control
220° F (105° C).
Noncondensing.
Access to the control is achieved by opening the
hinges control panel door covering the electrical
components.
provided to program set point and differential
values for each stage and to control the display.
The
The four keys are Select, Up arrow, Down arrow
and Enter.
Select Key - Sequentially prompts the user as to
what parameter is being displayed: set point,
differential, stage energized, operation mode
(heat), indication of assigned stage (1,2,3). Once
the last parameter value has been viewed,
pressing the Select key will display the control
values again from the beginning of the display
loop.
Up and Down Arrow Keys - Allow the displayed
parameter to be increased or decreased. After
pressing the Select key, a control value can be
changed by using the Arrow keys.
values will be increased or decreased by 1° F for
each time the Arrow keys are depressed.
Enter Key - Places the new value into the
memory of the microprocessor.
IMPORTANT:
operation will not be entered in the memory of
the microprocessor until the Enter key is
pressed.
Control values and operation selection will
remain in the device memory even after power
is removed.
Select and Enter Keys simultaneously
pressed - Changes operation mode of the
control from heat to cool mode. DO NOT
CHANGE THIS SETTING.
must always be in the "HEAT" position for
proper operation of the water heater.
When all stages have been programmed the
display will revert back to sensed temperature
and load energized status.
15
Four programming keys are
A control value or
This control
Control
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