2.Lint Chamber Air Pressure Switch
The lint chamber air pressure switch utilized in the dryer is used to insure that there is proper air flow through the dryer. If there is a problem with this air pressure switch an "AIR FAULT" error message will be displayed via the L.E.D. (light emitting diode) on the Telemecanique XBT digital display unit.
a.Probable causes for an "AIR FAULT" error message;
1)Clogged lint screen.
2)Air pressure setting incorrect.
3)Air pressure switch (PS3) or wiring back to the PLC (Programmable Logic Controller).
b.Possible solutions;
1)Perform preventive maintenance and lint screen cleaning procedures.
2)Set correct air pressure setting.
3)For a quick check of the air pressure switch wiring, perform the following:
•Run a drying cycle.
•Does the air pressure switch's indicator come "ON"?
•If yes, switch and its adjustment.
•If no, check switch and its adjustment.
•Verify that the PLC (Programmable Logic Controller) input L.E.D. (light emitting diode) #5 comes on.
•Does L.E.D. #5 come "ON" when the switch is active?
•If yes, wiring is okay.
•If no, check the following:
•Air pressure switch, its setting and wiring.
•Check wiring back to base electrical junction box.
4)Junction Box
•Check PLC (Programmable Logic Controller).
•Refer to electric diagrams;
•Electrical panel diagram.
•Junction box diagram.
•Retest; verify that the signal is operational.
77
