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The front panel of the A419 control has a liquid crystal display (LCD) and an output relay
status LED (Light-Emitting Diode) indicator.
Liquid Crystal Display
During normal operation, the LCD displays the sensor temperature, a symbol indicating
units of temperature (°F or °C), and an icon indicating Heating ( ) or Cooling (
See Figure 8.
The temperature value ranges from -30 to 212°F (-34 to 100°C) in 1° increments. The LCD
also displays BIN if the Temperature Offset function is activated.
Figure 8, Front Panel and Display
Output Relay Status Indicator LED
A green LED on the control's front panel illuminates when the output relay is energized and
the N.O. contacts are closed.
Cooling/Heating and Setpoint Modes
Jumpers are used to place the A419 control in Cooling or Heating mode and set whether
Cut-in or Cut-out occurs at Setpoint. Four operating modes are possible: Cooling/Cut-in,
Cooling/Cut-out, Heating/Cut-in, and Heating/Cut-out.
Cooling Modes
When Cooling/Cut-in mode is selected, the differential is below Setpoint. The output relay
energizes and the LED indicator illuminates when the temperature rises to Setpoint. When
the temperature drops to Setpoint minus the differential value, the output relay and LED
indicator de-energize.
When Cooling/Cut-out mode is selected, the differential is above Setpoint. The output
relay energizes and LED indicator illuminates when the temperature rises to Setpoint plus
the differential value. When the temperature drops to Setpoint, the output relay and LED
indicator de-energize.
22
Direct Drive Fluid Coolers
∗
) mode.
During programming, the LCD
displays the control functions and
their programmed values. After
30 seconds of inactivity, the
display returns to the sensor
temperature. See the Adjustments
section for instructions on using
the keypad to change settings.
IOM 1062
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