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98 Model 405 A/C Issue

Discussion of AC's, plumbing and sanitation related issues.
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AnamCara
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Re: 98 Model 405 A/C Issue

Postby AnamCara » May 22nd, 2020, 8:49 pm

I know its kind of late to chime in but does water flow from the aft ac cooling water overboard discharge when the forward ac is on? You mentioned that it is a single pump system.
Possibly just an issue in the pump relay control for the aft unit?
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Viper
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Re: 98 Model 405 A/C Issue

Postby Viper » May 22nd, 2020, 10:04 pm

In a single pump system, when any one of the AC units calls for water, it will flow through all the AC units on board. So if you have 3 AC units and you turn on just one, you'll see 3 overboard discharges if each unit has it's own discharge port.
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g36
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Re: 98 Model 405 A/C Issue

Postby g36 » May 24th, 2020, 3:15 pm

Fwiw. on my add on 3rd unit in my 405 aft cabin it is a totally separate system including its on water pump. I don't know what would have been the setup from carver with 3 units. I know mine was oem with only 2 hvac units so those do share a common relay box.
1997 Carver 405
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The Black Pearl
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Re: 98 Model 405 A/C Issue

Postby Viper » May 24th, 2020, 4:13 pm

One pump for three units is the norm. I have seen a second pump used in boats that have an additional air conditioning unit in an enclosed flybridge.
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Re: 98 Model 405 A/C Issue

Postby Midnightsun » May 24th, 2020, 5:36 pm

I can confirm the factory setup is a single water circulation pump for all 3 units. Any AC that has a call for cooling or heat, will activate the centralized pump.
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2007 Carver 41 CMY
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