Process Technology Lufran LUF Series Manual page 45

Maintenance Procedures (Continued):
M1: Liquid Level Sensor, Top Half Plumbing
There is one liquid level sensor located at the top of heating column 1, and for heaters with 3-4 heating
columns there is another liquid level sensor at the top of column 3. These are capacitive sensors that
must be inspected for proper adjustment every 6 months. If a sensor is out of adjustment, it may be re-
calibrated.
The technician may choose to skip the inspection procedure and instead calibrate the liquid level sensors
every 6 months.
Procedure M1-1: Liquid Level Sensor Inspection Procedure:
1) If the unit is in LOCAL mode, press the
HEATER ON/OFF button to the OFF
position. If the unit is in REMOTE mode
disable the heater from the customer
supplied remote controller. This will also
prevent the heaters from energizing.
2) Continue water flow through the unit for
this procedure. Allow the unit to cool to
ambient inlet temperature.
3) Open the rear cabinet door.
4) Inspect all of the plumbing connections on
the top half of the unit for possible leaks.
Any leaks found must be repaired.
Locate the capacitance-type sensor on the
(top) outlet manifold of heating column 2
and 4 (if applicable.). Notice the LED on
the back of the sensor is red when
detecting liquid in the outlet tube of the
heating column. The liquid level sensor
should be about 3.5mm (0.125-inch) away
from the outlet manifold. When there is no
liquid in the heating column outlet tube, the
red LED will turn off and the heater will
enter alarm mode.
Ne pas déplacer le liquide position du capteur de
niveau dans le support de montage, ou le
capteur va perdre son étalonnage. Si le capteur
de niveau de liquide est déplacé dans le support
de montage, le capteur doit être ré-étalonné.
5) When there is once again water in the heating column outlet tube, press the ERROR RESET button
on the control display to clear the alarm.
6) If the red LED fails to shut off and the unit fails to enter alarm mode, then the level sensor must be re-
calibrated.
M-43-25
Revision - Date 03-01-04-18
Figure 34: Liquid Level Sensor
Do not move the liquid level sensor position in the
mounting bracket, or the sensor will lose its
calibration. If the liquid level sensor has shifted in
the mounting bracket, then the sensor MUST be
re-calibrated.
44
LUF-Series Lufran Manual
Standard outlet, Standard Interface