07-07-2006, 07:43 PM
I have a fairly new (aprx. 1 yr old)rtu with a dirty filter alarm. Even with new filters the alarm remains. I read in the IOM that the alarm is triggered at .5 in.w.c. diff. The unit has both 2 " disposable and bag filters so I'd imagine the press drop is high in the best case.I think someone has played with the switch.The alarm will go away if I place the down stream tube out of the door and blow into it so I believe the switch is only in need of adjusting.I am familiar with adjusting other types of static press. or flow proving switches and usually it's some variation of turning the adj. screw one direction until the unit alarms or shuts down and then back off a pre determined number of turns.Can someone tell me the recommended proceedure for adjusting this switch.Also airflow is o.k. per manometer readings and refrig. pressures.