Process Technology Lufran LUF Series Manual page 49

Maintenance Procedures (Continued):
Procedure M3-2: Leak Detector 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 rear cabinet door. If the leak detector is wired to a multi-port sensor/actuator box located on
the back panel, then disconnect the plug for the leak detector. When included, this connector is
usually connected to port 3, but refer to your electrical prints to confirm the correct port number. If the
wires for the leak detector are hard-wired to terminals on the low-voltage electrical panel, disconnect
the leak detector wires from those terminals. Refer to the electrical print for the specific terminal
numbers.
4) If needed, remove the electrical connector from the leak detector to ease in the wiring removal from
the cabinet. If necessary, cut and remove any cable ties that hold the leak detector wiring.
5) Loosen and remove the fitting that holds the leak detector to the mounting bracket.
6) Slide the leak detector from the fitting on the bracket.
7) Install the new leak detector into the fitting.
8) Route the new wiring in the same pattern as the previous leak detector wiring.
9) Depending upon the design of your particular heater, connect the leak detector plug to multi-port
sensor/actuator box or connect the wires to the terminals on the low voltage electrical panel.
13) Restore power to the unit.
14) Perform procedure M3-1: leak detector inspection procedure.
15) If the sensor passes the inspection, the unit may be restarted and returned to service.
M4: Purge Gas Flow Switch
There is one purge gas flow switch for the entire unit. It must be inspected every 6 months.
Procedure M4-1: Purge Gas Flow Switch 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) Shut off purge gas flow. The heater will enter alarm mode and the stack light (if provided) will
illuminate the red light.
3) Restart purge gas flow. Verify that the purge gas supply pressure is regulated between 1.75 – 6.9
bar (25 – 100 psig).
4) Press the ERROR RESET button on the control display to clear the fault condition.
If the unit fails to generate an alarm or fails to reset, the switch must be replaced. There is no
calibration procedure for this part.
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.
48
LUF-Series Lufran Manual
Standard outlet, Standard Interface