My door seal cycles every 3-5 minutes.  I had a pinhole leak at the seam where the seal is glued together.  You could also have a leak at the switch on the door sill.

Pete

-----Original Message-----
From: Denis Conkey [mailto:dconkey@roadrunner.com]
Sent: Sunday, July 28, 2013 7:57 PM
To: lml@lancaironline.net
Subject: IVP Pressurized Door Seal and A/C Fans

I know many of you have experience flying with the pressurized IV.  How often should the door seal pump engage after the pressure is up on the Seal?
Ours seems to have a very short cycle "on" about every 5-8 second.  The pump runs a second or less when it cycles on.  Not having experience with the pump, seems like the cycle time should be a bit more than that which might be indicative of a slow leak.  We have checked for leaks in all our tube connections using soap bubbles and could not identify any leaks.  What is a good way to check for leaks?  Is it possible for the pump to be leaking internally?  Any advice on this topic would be much appreciated.  

We have an air conditioner unit and the fans in the cabin that draw in the air are very noisy.  They are 4 inch Attwood Turbo 4000 fans.  These fans are estimated to be more than 5-6 years old but used very little.  I noticed that Attwood has a Series II fan that might be quieter.  Are there other options for fans that are not quite so noisy.  These will drive any backseat passenger crazy and I fear will be quite noisy in the front as well.  If you know of any other 4 inch fans that would be well suited for this purpose or if the Series II fans are better, please let us know.

Thanks,

Denis Conkey/Jim Thompson
Lancair IVPT - N750PJ
805-402-6197