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Old 11-23-2020, 08:34 PM   #1
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Vbirth heat no worky

AC works great. Heat has never worked. Fan kicks on like it wants to do its job and make heat but it wonít kick the compressor on. I feel like something isnít hooked up that should be. I also feel like itís something extremely simple which will be a royal PITA to figure out.

Here are some pics to help.

Thanks all.
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Old 11-23-2020, 08:36 PM   #2
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Who ate my shrimp?

It is likely you will need somebody who speaks AC, specifically things like reversing valves. I didn't stay in a Holiday Inn last night and am this useless.
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Old 11-24-2020, 08:09 AM   #3
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Just because you have controls that show the ability to create heat does not mean the unit is capable of heating.

A tech will be required , yes to look for reversing valves , to decide what you have installed.
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Old 11-24-2020, 09:35 AM   #4
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Not all units with heat do it with reverse cycle, some just use a heat coil. There may be an option in the menu to activate beyond just selecting heat.

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Old 11-24-2020, 09:50 AM   #5
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Picture 2 looks like an encased blower? Does it have an electric heat coil
Rather than using the AC reverse cycle I have Hot Pods in the supply duct that look similar.
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Old 11-24-2020, 11:26 AM   #6
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Yes look for the reversing valve on the compressor. Sometimes just rapping it with a tool will loosen it if it hasn't been used often.
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Old 11-24-2020, 11:27 AM   #7
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Do you have the make and model number? If so I would call the manufacturer and see if it actually does have heat, a lot of A/C units are cool only. Just because the thermostat has a heat setting doesnít mean the unit has heat capability. If it does have heat what type of heat does it have? Reverse cycle or resistance heat. If it has reverse cycle the reversing valve could be bad. If it is resistance heat the element could be burned out. First thing is you have to know what type of unit you have. Good luck.
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Old 11-25-2020, 11:22 AM   #8
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Thanks guys. I really don’t like to just call a mechanic without having an idea of the problem first. Been screwed over before. Plus it’s a way for me to learn more about the systems of the boat.

There are 3 reverse cycle systems on the boat and I find it hard to believe that the forward system would be the only one without heat.

I pulled off the duct and inside the white plastic thing is simply a T off the blower to send air to the left and to the right. One blows into the v birth the other blows into the galley. I didn’t see signs of electric elements.

Does anyone have a picture of a reversing valve? Any more information on how it works? Is it a simple valve that reverses the water flow? The fact that the compressor isn’t kicking on when calling for heat is interesting as well.

This system is in a tight closet so I’ll have to pull the ducts out and the blower duct to see anything.

I need to make another trip to the boat soon....I’m craving more shrimp and grits
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Old 11-25-2020, 01:03 PM   #9
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I am not an A/C expert but the reversing valve reverses the coolant flow so instead of dumping heat into the cooling water it takes heat out of the water and brings it into the boat. The water flow doesnít change at all.
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Old 11-25-2020, 01:47 PM   #10
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Ok thanks. My central system is easy to get to so Iíll try to find it on that system first so I know what Iím looking for.

In the mean time if anyone has any more info Iíd appreciate it

Thank you.
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Old 11-25-2020, 02:16 PM   #11
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Steve, you will not see a heating element on a reverse cycle A/C unit.
It makes heat via the reversing valve. It then takes heat out of the water instead of putting heat into the water. You should be able to hear the reversing valve click as it changes from A/C to heat position.

You also mentioned a T in the blower outlet. They do make an adjustable Y fitting so you can set the amount of the blower air going fwd. It may be a bit involved to install it and personally, if I wanted/needed that, I would let the tech install it. It is a 'set and forget' and not meant to be changed frequently.

The unit that supplies the fwd stateroom and galley, .... is the thermostat located in the fwd stateroom? If not, you will need to adjust the temp so you get more heat fwd and may make it uncomfortable in the galley area.

Just for fun, use an IR gun to measure the temp of the air coming into the fwd stateroom compared to the temp of the air coming into the galley area. They should be reasonable close in temp.

Assuming the reversing valve works, I would start trying to increase the airflow into the fwd stateroom.

If all else fails, a nice 120vt ceramic heater will solve your lack of heat problem.
I too suffer from reduced airflow into my stateroom. The American Tugs have a built in 120vt resistance heater that solves the lack of heat in that stateroom.
As per the lack of ideal temp in the summer time, I am considering an awning over the 'house', when I am in port. I have been considering it for about 5 years.
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Old 11-25-2020, 02:47 PM   #12
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Do a web search for marine air revising valve. lots of info there.
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Old 11-30-2020, 01:03 AM   #13
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Thanks everyone.

To answer some questions. All 3 systems are all tied into each other. Durning the summer, all 3 systems worth together to keep the boat cool. For a while we had the forward system not working. It was just tripped due to a dirty strainer, it during that time, the art and central systems couldn’t keep up and it would be 90 degrees. With all 3 running, it can maintain 80 and recover much quicker. It’s very comfortable and even in the summer it’ll freeze you out at night.

So I like the plumbing. During mild weather, the central system is really the only one that runs due to the fact that it gets the sun through the windows.

Anyway, back to the forward V birth heat....I did some reading on the reversing valve. From what I read, it sounds like if the reversing valve was stuck, the compressor would still run, you just wouldn’t get hot air.

Mine doesn’t kick on. The fan does, just not the compressor.

So next time I’m at the boat, I’ll take the ducts apart so I can see and I’ll look for a reversing valve. I’m hoping it’s there and there’s just a wiring issue. But you guys might be right, it might not be a model that provides heat.

We’ll see. If it doesn’t, I’m not too worried. We can just leave her door open and crank the heat in the saloon.

Thanks everyone.
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Old 11-30-2020, 07:06 AM   #14
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The reversing valve is exterior to the duct work.
It is time for you to get a tech out there to show you around the A/C unit?
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Old 11-30-2020, 08:46 AM   #15
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Quote:
Originally Posted by OldDan1943 View Post
The reversing valve is exterior to the duct work.
It is time for you to get a tech out there to show you around the A/C unit?
Because the system is in a closet, a small one, the duct work makes it very difficult to really be able to see anything at all. So removing it will give me better access to the system. In that 2nd picture I posted, the unit sits behind the ducts and that white blower T.

I’m just going to take a look. Should be able to find out a lot. I might end up needing a tech, but it doesn’t hurt to do some digging first.
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Old 11-30-2020, 10:10 AM   #16
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It helps if you have a schematic of the system. Our CruisAir units have one inside the cover of the control modules...and I have a manual. Dometic's tech hotline is very helpful if you have any of their legacy units....MarineAir and CruiseAir, for example.
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Old 11-30-2020, 01:14 PM   #17
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https://www.amazon.com/Fdit-Conditio.../dp/B07SJ7J7X2
This may look like yours, if you have a heat-pump A/C unit.
Even a heat pump A/C system will have a heater element for heating if the incoming water is below 38 degrees F, since pulling in cold water and removing more heat makes it an icemaker, which often splits the heat exchanger and other fun / expensive things.

Be careful rapping on any brass or bronze metal parts since A: they hold a liquid or gas inside, and B: Brass and Bronze are quite soft metals and don't like getting hammered on.
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Old 11-30-2020, 03:38 PM   #18
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Well, if a V-birth is not working you need to try a Cesarean.
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Old 11-30-2020, 06:40 PM   #19
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Did you try it on cooling just now? and the compressor and fan do what they are supposed to on "cool" right? if yes you know the compressor is working. I know you said AC works great but maybe that was some time ago.

Next a really simple thing you must have tried already?? but you don't mention so here goes.
After you start the unit on "heat" and the fan starts but not the compressor.... did you turn up the demand temperature on the control as far as it will go? and the cabin is below that temperature right? Also it generally takes a few minutes to start on its reverse cycle, you did give it a few minutes?

Can you see the cooling water overboard discharge from this unit? is water running out?

Even if you cant see the discharge, if you have multiple units but only one sea water pump you should be able to hear the water running through the problem unit after you have started one of the other units.

No water is what usually stops the compressor (correctly) via the high pressure cut out... but typically that stops it after it has run dry for a short while, if the compressor
isn't cutting in on cold or hot maybe the high pressure cut out stopped it last time it was in use and you need to reset it, there is little tab to press back in
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Old 12-01-2020, 09:52 AM   #20
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Quote:
Originally Posted by stone beach View Post
Did you try it on cooling just now? and the compressor and fan do what they are supposed to on "cool" right? if yes you know the compressor is working. I know you said AC works great but maybe that was some time ago.

Next a really simple thing you must have tried already?? but you don't mention so here goes.
After you start the unit on "heat" and the fan starts but not the compressor.... did you turn up the demand temperature on the control as far as it will go? and the cabin is below that temperature right? Also it generally takes a few minutes to start on its reverse cycle, you did give it a few minutes?

Can you see the cooling water overboard discharge from this unit? is water running out?

Even if you cant see the discharge, if you have multiple units but only one sea water pump you should be able to hear the water running through the problem unit after you have started one of the other units.

No water is what usually stops the compressor (correctly) via the high pressure cut out... but typically that stops it after it has run dry for a short while, if the compressor
isn't cutting in on cold or hot maybe the high pressure cut out stopped it last time it was in use and you need to reset it, there is little tab to press back in
Yep, AC was working great that day. This thing hasnít had heat since weíve had the boat for about 2 years. Ac has always worked.

Yes, setting the heat to a temp higher than ambient will kick on the fan but thatís it. No pump, no compressor. This unit has its own pump and it has excellent flow, when it is on.

So like I said, AC works as it should. When I select heat and the temp falls below the set temp, or I set a higher temp, the fan will kick on (auto mode) but it doesnít turn the pump on or the compressor.

I believe if it was just a bad reversing valve, the pump and compressor would turn on but I wouldnít get heat.

So my thoughts are, either something isnít wired properly or this system is AC only. Being that this has always been a Florida boat, that might be the case. Maybe whoever had these installed never used the v birth and didnít want to spend the extra money. Idk.

But if I remove the ducts so I can see inside and look for the reversing valve, that should tell me what I need to know. Then I can go from there.

Thatís why I donít think an ac tech is necessary.
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