| Denis,
My cycle time is maybe once every minute or two, a very brief "sip" seen on the status light. The door seal might be leaking behind the adhesive part (against the door frame), not easily detected with soap bubbles; that is the right way to find it, but you almost have to immerse the door with a very soap washcloth.
You are correct that the pump might be the problem, a back leak inside the mechanism. Over the last couple years, I have changed the pump twice to solve mystery leaks or inadequate pressurization. They are cheap and easy to replace.
You can test the pump by placing a known sealed container (or bladder) on the outlet and letting it pressurized it, then remove power and observe if it leaks back through the pump.
The cabin fan should be quiet. I often fail to hear it when I shut down, creating an added drain on the battery.
Hope this helps.
Jeff L LIVP in New Jersey
On Jul 29, 2013, at 6:01 AM, Lancair Mailing List wrote: Subject: IVP Pressurized Door Seal and A/C Fans
Date: July 28, 2013 10:57:11 PM EDT
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
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