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Air in aircon seawater system

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FalParsi View Drop Down
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    Posted: 03 August 2022 at 19:43
Good evening from wonderful Greece…

I always close the seawater intake valve when I go sailing so as not to introduce air into the aircon seawater system. Today I forgot to do so, and now I am getting the HPF fault on all 4 aircon units. I know everything is in working order, and I believe the HPF fault is because there is air in the system. What is the best way to bleed the seawater cooling system?

Thanks,
Lawrence
2016 Hanse 505 #120
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FalParsi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FalParsi Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2022 at 20:08
I should have mentioned that I am anchored in a bay so I don’t have access to shore water to push water through the pump.
2016 Hanse 505 #120
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32mike View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 32mike Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2022 at 22:08
I had an issue once where the sea water strainer was dry, probably due to the same cause that you suspect. I closed the sea cock and then opened the top as if to clean the filter. It was completely dry. I cracked open the sea cock to fill it and closed it again. Then refit the filter and glass top and opened the sea cock. Then turned the Ac’s on. The pump sucked the water through and everything worked.
Mike
S/V Dulces Sueños
458 #087
Tampa, FL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2022 at 01:01
I get an HPP fault most every time I fail to close the Aircon intake seacocks and go for a sail with any degree of heel. 

The easiest way to clear the fault:

1- open AC intake seacocks
2- remove the clear plastic seawater hose from the AC unit (the top hose) - I usually do this at the unit in the salon
3- have a bucket handy
4- have a helper turn on the AC's
5- when you have a good flow of water into the bucket, quickly reattach hose, turn off AC's, tighten hose clamps, and then tidy up. 

On my boat, getting the air out of the AC unit in the salon seems to clear all units.

I think there's a bleed screw on the high pressure pump but I find disconnecting the top Aircon hose in the salon as described works quicker and more reliably. 




Edited by kipwrite - 04 August 2022 at 01:42
Kipwrite
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SVZara View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SVZara Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2022 at 02:14
I must be lucky.  I have NEVER closed my A/C seawater intake.  The system stays primed and ready and runs without issue even after sailing 100s of miles while offshore.  I am surprised this an issue for you guys.

Edited by SVZara - 04 August 2022 at 02:15
Marc
S/V Zara
2016 Hanse 505, Hull #129
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FalParsi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FalParsi Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2022 at 10:31
Kipwrite, that did the trick. Thank you!
Time to install a burp valve in that location so next time will be less messy.
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Gale Force View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gale Force Quote  Post ReplyReply Direct Link To This Post Posted: 04 August 2022 at 14:18
If You forget to close the seasick the easiest way to solve the problem is to open the bleed screw a few turns until seawater starts to appear then close and switch on pump.A two minute job if you have the correct spammer at hand.
Duncan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 05 August 2022 at 06:38
Bleeding air at the pump is the best way since that is where the water is being pushed from. I replaced the small nylon NPS stopper with a same size barb fitting. I then added a 2 foot length of 3/8 clear tubing with a small shut off valve at the end. This makes it a lot simpler to bleed. I fish out the tube, raise it above the waterline and open the valve. The air is quickly forced out by the incoming sea water, but the water will not come up past the height of the hose. I then close the valve and drop the tube back down. This is all done without turning on the pump or messing with the thru hull or strainer. 30 seconds, no tools ! 
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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FalParsi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FalParsi Quote  Post ReplyReply Direct Link To This Post Posted: 05 August 2022 at 06:53
Perfect Leon, thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gale Force Quote  Post ReplyReply Direct Link To This Post Posted: 05 August 2022 at 07:26
I will be installing that one next time I am in GF in a few days time.

Duncan

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