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Priming AC water pump
- kclife
- Scurvy Dog
- Posts: 6
- Joined: June 14th, 2021, 10:38 am
- Vessel Info: 2002 Carver 356 Aft
- Location: Nashville, TN
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Priming AC water pump
If we put a water hose in the discharge, do we just put enough water in to fill the discharge and then turn the on the AC?
Also, can anyone confirm the AC discharge is the far left discharge with the stain in this photo?[image][/image]
First time boat owners feeling like a fish out of water.
2002 Carver 356 aft
Newbie to boating! Trying to live my best life now.
- waybomb
- CYO Moderator
- Posts: 2404
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
1996 Boston Whaler Rage 15 - Location: Saint Joseph,Mi
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Re: Priming AC water pump
Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
- kclife
- Scurvy Dog
- Posts: 6
- Joined: June 14th, 2021, 10:38 am
- Vessel Info: 2002 Carver 356 Aft
- Location: Nashville, TN
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Re: Priming AC water pump
Newbie to boating! Trying to live my best life now.
- Midnightsun
- CYO Supporter
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- Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's - Location: Montreal, Canada
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Re: Priming AC water pump
- kclife
- Scurvy Dog
- Posts: 6
- Joined: June 14th, 2021, 10:38 am
- Vessel Info: 2002 Carver 356 Aft
- Location: Nashville, TN
- Has thanked: 6 times
- Been thanked: 1 time
Re: Priming AC water pump
Newbie to boating! Trying to live my best life now.
- bud37
- Admiral
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Re: Priming AC water pump
There are other ways but this always worked for us in the spring or after the boat got hauled.
- kclife
- Scurvy Dog
- Posts: 6
- Joined: June 14th, 2021, 10:38 am
- Vessel Info: 2002 Carver 356 Aft
- Location: Nashville, TN
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Re: Priming AC water pump
Newbie to boating! Trying to live my best life now.
- bud37
- Admiral
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Re: Priming AC water pump
kclife wrote:Source of the post Thank you! This is our first boat and it is a little intimidating.
Don't be, the systems are really quite basic, just take your time and think it thru.... it may take a couple of tries till you get it right but so long as the rest is ok it will work.....good luck with your new boat.
- Midnightsun
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2007 41CMY
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Re: Priming AC water pump
Just a guess but the fitting with the stains around it is probably the AC water exit.
In order for the pump to function, there needs to be a demand for heat or cool from the thermostat. Once this is received, power is sent to the pump. Have you heard the pump kick on? If so and no water is exiting from the thru hull then there is a problem, most likely a pump issue or possible loss of prime.
That being said, these pumps do not require priming as they are set up with filter and pump below the water line which means they just get flooded with water when the seacock is open and the boat is in the water. For anyone who needs to prime, I highly suggest you look at the hose leading from the filter housing to the pump. Does it exit in an upward fashion before attaching to the pump that could cause the line to be above the water line even for a few inches? If so, then a slight correction of this hose should alleviate priming for good. Could also be a screw up when mounting the filter housing. Does the water level in the housing get high enough to exit the housing? Water should overflow from the housing if the cap is removed. If one or the other is not happening then the filter housing is mounted too high, drop it down as required to correct the issue.
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Re: Priming AC water pump
You will have a breaker at the electrical panel for each AC unit on board, and a separate breaker for the AC water pump. I believe your pump is in front of the port engine, if it is, remove the small front section of the port engine hatch. Ensure the seacock is open. Turn on the water pump breaker and the breaker for the salon AC unit. Listen for the compressor to kick in, once it does, the pump should start. Confirm it's actually running. If it is, the way I prime these is by loosening the screws on the pump housing on the front of the pump while the pump is running. It doesn't require loosing too much, just enough to let air escape. Once it starts pumping, water will start shooting out the sides of the pump so have some rags ready. You'll know when it's pumping as there will be an obvious change to the sound of the pump indicating it's flowing water. Then tighten the screws quickly. This is such a common method that some pumps used to come with wingnuts instead of screws for this reason. The only caution here is that there is an o-ring behind the pump housing so don't loosen the screws too much or the water pressure will push the o-ring out of place.
Once the system is primed, you should be okay from then on unless you come out of the water which is the case up north every winter. There is also a marine railway here where boats are slung out of the water and transported over a hill to the adjacent lake which often requires the uninitiated boater to prime their HVAC system afterwards. Those in the know will shut their seacock off ahead of time. This helps prevent having to prime later as it won't let all the water siphon out of the system. There are many hacks and mods to accomplish the same thing, some will tee off close to the pump on the output side with a valve that just needs to be opened for purging.
Hopefully priming will solve the issue. Good luck and keep us posted.
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