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. The
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. The temperature
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.
Set Point Adjustment Range:
Max setting
220° F (105° C).
Temperature Accuracy:
+/- 1° F.
Display Resolution:
1° F via Liquid Crystal
Display (LCD). Sensor:
Thermistor 4.8 ohms/° F.
Operating Humidity:
5 - 95% RH
Noncondensing.
Operating Ambient Temperature:
-30° to 125° F.
Access to the control is achieved by opening the
hinges control panel door covering the electrical
components. Four programming keys are
provided to program set point and differential
values for each stage and to control the display.
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. Control
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.
15
125
1 2 3 4
FIG.
20 Electronic Temperature Control
Digital Display and Programming Keys
SPECIFICATIONS
A control value or
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.
This control
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.
IMPORTANT:
