Process Technology Lufran LUF Series Manual page 46

Maintenance Procedures (Continued):
Procedure M1-2: Liquid Level Sensor Calibration Procedure:
1) Insure the liquid level sensor is properly positioned in facing the outlet tube of the heating column.
The sensor should be about 3.5mm (0.125-inch) away from the outlet manifold.
2) Using a small flat blade screwdriver, turn the sensor adjustment potentiometer on the back of the
sensor clockwise until the red LED on the sensor illuminates.
3) Once the red LED illuminates, turn the adjustment potentiometer an additional ¼ turn clockwise.
4) Repeat the inspection procedure, provided on the previous page. If the sensor again fails to trip
and/or reset from alarm mode, repeat the calibration procedure or replace the liquid level sensor.
Procedure M1-3: Liquid Level Sensor Replacement 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) Turn OFF Power to the unit.
Vérifiez que l'alimentation électrique est coupée,
et tous les périphériques de verrouillage /
débranchement nécessaires sont correctement
installés.
3) Open the front and rear cabinet doors. Locate the liquid level sensor to be replaced.
4) Disconnect the lead wires for the liquid level sensor on the low-voltage panel in the electrical side of
the cabinet.
5) Loosen and remove the two nuts that are holding the liquid level sensor in the bracket.
6) Slide the liquid level sensor out of the bracket.
7) Insert the new liquid level sensor into the bracket. Attach and tighten the two nuts on the liquid level
sensor to fix its position.
8) Make sure that the position of the liquid level sensor is 3.5mm (0.125-inches) away from the outlet
plumbing manifold. If necessary, adjust and re-tighten the two nuts to adjust the sensor position.
9) Wire the two liquid level sensor lead wires to the appropriate terminals on the low voltage panel in the
electrical side of the cabinet. These will be the same terminals from where the original sensor wires
were removed.
10) Restore power to the unit.
11) Perform procedure M1-2: liquid level sensor calibration procedure and then M1-1: liquid level sensor
inspection procedure, provided on the previous two pages.
12) If the sensor is functioning properly, the unit may be restarted and returned to service.
M-43-25
Revision - Date 03-01-04-18
Verify that the electrical supply is shut off, and any
necessary lockout/tagout devices are properly
installed.
45
LUF-Series Lufran Manual
Standard outlet, Standard Interface