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Old 10-25-2017, 12:50 PM   #1
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Cruisair heat no raw water

Hi all.
So I have a head scratcher. My cruisair works fine in ac mode and blows warm in heat mode but does not turn the water pump on. To be clear, when the compressor kicks in on ac mode the water pump comes on. In heat mode the water pump is not coming on. In the manual, it states that the thermostat does not control the water pump but that the compressor does. It also states that the heat works off raw water. My question is if the water pump gets turned on by the compressor, then how does it get turned on in heat mode? And how do I get in on besides unplugging it from the compressor and plugging it into a regular onboard electrical outlet?
Thanks in advance
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Old 10-25-2017, 12:53 PM   #2
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Here is the bit from the manual.
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Old 10-25-2017, 12:57 PM   #3
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Does the compressor turn on in heat mode? If not then you are likely making heat with resistance electric.
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Old 10-25-2017, 01:16 PM   #4
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The compressor does not turn on in heat mode. Good thought but the manual specifically states that it is a reverse cycle heat pump that gets its heat from seawater.
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Old 10-25-2017, 01:49 PM   #5
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Without the cooling pump working, do you get a fault code and shut down?
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Old 10-25-2017, 01:56 PM   #6
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The compressor does not turn on in heat mode. Good thought but the manual specifically states that it is a reverse cycle heat pump that gets its heat from seawater.
How do you plan to extract heat from seawater without the compressor?

All any air conditioner does is take BTUs from one place and put them in another place. To make a heat pump work, it takes heat from the sea water and puts it in the boat, otherwise known as reverse cycle A/C.
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Old 10-25-2017, 02:02 PM   #7
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I think you must have a resistive-heat version. Wrong model number or mis-printed manual, maybe?

One way to check would be to look at your AC ammeter and see if you are pulling big(ger) amps when heating. Resistive heating would be 1500W or so, I would think.....
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Old 10-25-2017, 02:06 PM   #8
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I had it on for about ten minutes with no issues. Then decided to plug the water pump into the wall outlet. Still no compressor kicking on but warm air is coming out. Any chance it has back up resistance heat like a home heat pump and is just using that since the compressor isn't coming on?
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Old 10-25-2017, 02:12 PM   #9
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Your thermostat control should have a setting that allows you to choose resistance heat if you have it. Here is a screen shot of mine. See P-15.Click image for larger version

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Old 10-25-2017, 02:12 PM   #10
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When turning the thermostat up, I do get two clicks if that tells anything. First click nothing happens and then the second click the heat turns on. Exact opposite turning it down. First click heat turns off and second click does nothing.
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Old 10-25-2017, 02:20 PM   #11
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This is all I have. Very old school.
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Old 10-25-2017, 02:37 PM   #12
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Originally Posted by boathealer View Post
I think you must have a resistive-heat version. Wrong model number or mis-printed manual, maybe?
Or maybe an add-on sometimes later?


Quote:
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Any chance it has back up resistance heat like a home heat pump and is just using that since the compressor isn't coming on?
Quote:
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When turning the thermostat up, I do get two clicks if that tells anything. First click nothing happens and then the second click the heat turns on. Exact opposite turning it down. First click heat turns off and second click does nothing.
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This is all I have. Very old school.
Could be first click is supposed to turn on the compressor, but it's not working? Second click activates resistance heating?

Is it really a Cruisair system? Our MarineAirrrr (now Dometic) has the label clearly on the thermostat. Would have thought yours would say Cruisaire someplace conspicuous...

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Old 10-25-2017, 02:49 PM   #13
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New plan. Go with the assumption it has back up resistance heat that is working and a reverse cycle that isn't. As long as the compressor isn't kicking on, not worry about the water pump not working. Use it as little as possible until I can have someone who knows more than me take a look. Thanks for all the responses. I am now much more knowledgeable about marine ac systems than I was two hours ago.
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Old 10-25-2017, 02:51 PM   #14
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Or maybe an add-on sometimes later?








Could be first click is supposed to turn on the compressor, but it's not working? Second click activates resistance heating?

Is it really a Cruisair system? Our MarineAirrrr (now Dometic) has the label clearly on the thermostat. Would have thought yours would say Cruisaire someplace conspicuous...

-Chris
Old boat. Who knows. I don't see anything clearly printed on any of the hardware pieces. There are a few component pieces with labeling I'm going to try to look up for any hints.
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Old 10-25-2017, 05:09 PM   #15
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Old boat. Who knows. I don't see anything clearly printed on any of the hardware pieces. There are a few component pieces with labeling I'm going to try to look up for any hints.
Maybe try Googling "Yacht Air Corp Pompano Beach" and "Comfort System" and so forth, too...

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Old 10-25-2017, 05:48 PM   #16
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Maybe try Googling "Yacht Air Corp Pompano Beach" and "Comfort System" and so forth, too...

-Chris
Thanks. I spent a couple hours trying that shortly after buying the boat. I didn't find anything other than some dead ends. New to boat ownership though so if anyone knows anything about the company let me know.
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Old 10-26-2017, 04:20 PM   #17
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Look for a "reversing valve" in the refrigerant piping. This switches a reverse cycle system from heat to cool. If there is no such valve, you may have a "cool only" unit that uses electric heat. Some RV units that houseboats use work this way. This is particularly common on boats/RV's marketed in warmer climates. Could you post an image of the unit?

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Old 10-26-2017, 06:03 PM   #18
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Getting ready to leave the boat so this will be an item for another day. Here is a pic though.
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Old 10-26-2017, 06:04 PM   #19
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Dang thing posted upside down. Sorry but I don't know how to fix that.
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Old 10-26-2017, 08:57 PM   #20
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Did look real quick before leaving. I'm only about 90% sure what a reversing valve looks like but I'm pretty sure I don't have one.
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