Process Technology Lufran LUF Series Manual page 48

Maintenance Procedures (Continued):
Procedure M2-2: Outlet Process or Column TC 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. Apply lockout-tagout as required by your facility.
Vérifiez que l'alimentation électrique est coupée,
et tous les périphériques de verrouillage /
débranchement nécessaires sont correctement
installés.
3) STOP flow of water to the unit and drain column assembly. A provision for draining the unit must be
installed on the inlet plumbing when the unit is installed. If no method of draining the unit was
provided, the inlet water connection must be removed.
4) Open the rear cabinet door. Locate the sensor to be replaced.
5) Disconnect the 4-pin connector plug for the sensor.
6) Loosen the 1/8-inch fitting and remove the sensor from the fitting.
7) Insert the new sensor until the black label reaches the top of the 1/8-inch compression nut. Tighten
the fitting.
8) Connect the 4-pin connector plug.
9) Close the drain and allow water to flow through the unit. Check for leaks. If the fitting is not leaking,
the unit may be restarted.
M3: Leak Detector (Optional)
For heaters with option "-LK" listed in the model number, there will be one leak detector sensor located at
the bottom of the plumbing side of the cabinet. This device is a float switch that detects the presence of
liquid in the bottom of the cabinet.
Procedure M3-1: Leak Detector 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) Open the rear cabinet door.
3) Locate the leak detector near the bottom of the
cabinet. Verify that there is no liquid in the
bottom of the cabinet.
4) Raise the float with your hand. The heater will
enter alarm mode and the stack light (if
provided) will illuminate the red light.
5) Release the float. Press the ERROR RESET
button on the panel of the panel to clear the fault
condition.
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.
Figure 36: Leak Detector (Optional)
47
LUF-Series Lufran Manual
Standard outlet, Standard Interface