We're flushing the cooling system for the air conditioners on the 1975 Hatteras Yacht Fisherman. I'm sure it can be done other ways but this is how we did ours.
- Turn off all A/C
- Disconnect all air-conditioning discharge lines from the exit manifold.
- reconfigure return lines to a bucket or container.
- disconnect pick up line between the seacock and the onboard air-conditioning water pump at the pump.
- drop an external water pump into the container.
- configure a line from the container pump to the intake side of the on board A/C water pump.
- Mix 3 parts water to 1 part Barnacle Buster in container.
- Turn on one air-conditioner and the container pump at the same time.
- once the onboard A/C pump is primed, disconnect the external pump and let it flow for about 45 minutes to an hour.
- flush with fresh water
- disconnect all hoses and return to normal
- run all air-conditioners.
To see this video and more like it, go to our YouTube link in my signature.
FlushingAC.jpg
Thanks
How to flush the A/C system on a boat. 1975 Hatteras Yacht Fisherman, MASTERPLAN. Tutorial
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10-29-2019 11:45 AM #1Senior Member
- Join Date
- Jun 2018
- Posts
- 118
Cleaning the A/C water cooling system / How to
MASTERPLAN MIAMI
1975 58 Ft. Yacht Fish
8V71TI
HULL # 396
www.YouTube.com/MASTERPLANMIAMI
Adventure Awaits
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Re: Cleaning the A/C water cooling system / How to
Didn't watch the video, but based on the instruction you posted, I would say No need to run the air conditioners while circulating the descaling mix. It will heat the mix up and may even send the units into high pressure shutdown. Just circulate the mix and reconnect all of the hoses and then fire up the A/C units.
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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Re: Cleaning the A/C water cooling system / How to
I can’t imagine the heat and fumes coming out of the mixture of you turn a unit on. No need to
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: Cleaning the A/C water cooling system / How to
Karl posted this procedure in the Frequently Asked Service Questions about 15 years ago. I’ve been using the technique ever since. I have a jump box that I use to power a 12v bilge pump in a bucket.
https://www.samsmarine.com/forums/sh...eat-Exchangers
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Re: Cleaning the A/C water cooling system / How to
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: Cleaning the A/C water cooling system / How to
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10-29-2019 10:13 PM #7
Re: Cleaning the A/C water cooling system / How to
Guess you could direct wire the circulation pump and force it on if you want the extra flow which would be the only reason to run the AC.....But yeah, that heats things up quite a bit. "Ventilation required".
1978 53' Motor Yacht "LADY KAY V"
Hull number 524
Chesapeake Bay
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Re: Cleaning the A/C water cooling system / How to
Sky Cheney
1985 53EDMY, Hull #CN759, "Rebecca"
ELYC on White Lake--Montague, MI
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10-29-2019 11:19 PM #9Senior Member
- Join Date
- Jun 2018
- Posts
- 118
Re: Cleaning the A/C water cooling system / How to
We chose to run it through the onboard pump so we would be cleaning out more of the system. But like I said, I'm sure there’s more than one way. Oh, we ran our smallest unit. Didn't heat up too much but did get pretty warm. Note taken. Next time I'll try without running the A/C pump. All units dropped about 5 degrees in temp.
MASTERPLAN MIAMI
1975 58 Ft. Yacht Fish
8V71TI
HULL # 396
www.YouTube.com/MASTERPLANMIAMI
Adventure Awaits
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Re: Cleaning the A/C water cooling system / How to
Due to my issues with the whole AC pump trigger configuration I posted about on another thread going forward when I replace this all I will have a simple bypass switch wired in to run pump 24/7 if needed. Would come in handy for flushing without running compressors.