What causes air dryer to keep purging?
What causes air dryer to keep purging?
When the air pressure becomes greater than that of the preset “cut-out”, the governor controls the unloader mechanism of the compressor to stop the compressor from building air and also causes the air dryer to purge. Air compressors are designed to build air (run “loaded”) up to 25% of the time.
Why does my air dryer Purg every 30 seconds?
Your intuition is probably right. I think it would be the unloaders. When the system reaches 120psi the governor allows system air to the air dryer to signal the purge and allows air to the unloaders. The unloaders will just hold the check valves off their seat in the compressor head to stop the air from being pushed out of the compressor.
How does an air purging system work in a car?
How this system works is there is an air pressure signal line that comes from an air tank to the governor. When there is 120 psi (give or take a few) of air at the governor it is signaled to supply the unloader in the compressor and to purge the drier. Once this happens the compressor is no longer compressing and the drier has purged.
Why does my air conditioner keep purging?
If there is a small leak in the signal line to the compressor it will keep telling the compressor to turn back on and then start the whole cycle again even though the tank pressure has not gone below 90 psi. Another problem can be the drier itself due to a sticky check valve.
How often does my Cummins 8.3 dryer Purg?
I have a 1997 cummins 8.3 with a holset compressor and AD-9 dryer. The dryer is purging about every 30-45 seconds. It does this whether I am parked or driving. I know I do not have any air leaks as I only lose about 5 PSI over 24 hours. -The pressure in the tanks seem to stay steady at about 120psi.
Your intuition is probably right. I think it would be the unloaders. When the system reaches 120psi the governor allows system air to the air dryer to signal the purge and allows air to the unloaders. The unloaders will just hold the check valves off their seat in the compressor head to stop the air from being pushed out of the compressor.
How this system works is there is an air pressure signal line that comes from an air tank to the governor. When there is 120 psi (give or take a few) of air at the governor it is signaled to supply the unloader in the compressor and to purge the drier. Once this happens the compressor is no longer compressing and the drier has purged.
If there is a small leak in the signal line to the compressor it will keep telling the compressor to turn back on and then start the whole cycle again even though the tank pressure has not gone below 90 psi. Another problem can be the drier itself due to a sticky check valve.
I have a 1997 cummins 8.3 with a holset compressor and AD-9 dryer. The dryer is purging about every 30-45 seconds. It does this whether I am parked or driving. I know I do not have any air leaks as I only lose about 5 PSI over 24 hours. -The pressure in the tanks seem to stay steady at about 120psi.
