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Good cooling but no heat
November 28, 2009
10:44 am
mtzakin2
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Steve -
Thank you for all your time and effort. Will take your advice. Mike

November 28, 2009
9:55 am
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Steve Pooler
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Morning Mike~

From what we have gone thru on here...Me not being there, or not able to get pressure readings...Everything points to that unit being just slightly low on freon...It shouldn't take much to make it heat as well as the others...

Low fan should produce hotter air...but Get the unit serviced...

Steve~

November 28, 2009
9:27 am
mtzakin2
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Here's the comparison of the two units Steve. On the one that does produce normal heat, there is a large coil surrounding the compressor that is quite cold to the touch and smaller diameter tubing running in a pattern behind the air intake filter that feels very warm, particularly at the top and center of the tubing. In the unit that's producing no heat the large tubing at the compressor is still quite cold, but the smaller tubing at the air intake is barely warm at all. Hope this helps. Mike

November 27, 2009
7:19 pm
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Steve Pooler
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Yes Mike I realize it flows thru all three no matter which is running...That's not what I was asking at this point...Sorry if I was not clear.

It should be pretty simple to feel a unit's condenser (although I do also know they can be hidden quite well)

No need at this point to remove hoses etc...

Run two units in the heat mode (one that heats & the one that does not) How do they compare by feel ?

The one in question should feel like the other...If it does not...Tell me how they differ.

Steve~

November 27, 2009
5:51 pm
mtzakin2
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Steve - Here's the lowdown on the water flow - Water flows through all three units regardless of which one is on. Water flows out of both hull openings if any one of the units is on. Therefore the only way I can tell if there's water blockage for the unit in question, is to remove the outflow hose from the suspect unit and turn the unit on while making sure the other two are off.
Full outflow at that unit then would indicate no restriction of water to that unit - Do you agree with my thinking before I go into my "Captain contortionist" mode ? Mike

November 27, 2009
5:18 pm
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Steve Pooler
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Yes there is a reversing valve that makes it a heat pump...You don't want to think about that yet because it is expensive...

Since you said it does heat some, and cools well, I don't suspect the reversing valve...at least form here anyway...

The next thing you might want to do is feel the condenser coil while heating (the part the seawater runs thru) Compare it to one of the units that does heat well.

If it is colder than the one that heats...Then that unit is not getting enough water...Since you only have 2 overboards & 3 units...Two of those units must be plumbed into one overboard...If one unit had a blockage the water would just go thru the other unit and look the same going overboard.

If it is warmer than a heating unit (not cool) then that unit is low on freon...

I know all this may sound contrary...But trust me here...Then let me know what you find.

Steve~

November 27, 2009
5:13 pm
mtzakin2
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Steve -
forgot to answer your question regarding fan speed. In heat mode the unit in question does go to maximum speed. In manual mode all speed selections are still available. Mike

November 27, 2009
5:02 pm
mtzakin2
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Thanks for the info Steve. The boat definitely has only two water outlets for all three units (I've owned more than one of this model and they all had two outlets). There appears to be good water flow everywhere. With the other two units turned off there is still normal water flow out of the boat. The AC in the unit in question is really quite cold which is why I wasn't suspicious of the freon. Is there such a part as a heat/cool valve or relay that might be a culprit ? Mike

November 27, 2009
4:21 pm
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Steve Pooler
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I would think if you have 3 units…There should be 3 overboards (since you know of 2) I don't think I have seen a boat the had 2 units into one overboard and a separate overboard for the third unit…

Be sure you have water thru the unit in question, or what I say below will also show but it will be because that unit has No water…

If the other two heat, and seem to have the same water flow…Then the unit in question is likely low on freon…

They will quit heating well with a slight loss of freon, but it won't be as noticable in cool mode.

If the fan goes down to low speed (in heat) and you cannot raise the speed manually then it is low on freon…(it's part of a program sequence for the heat mode in cold seawater, but will also show up if the unit is low on freon)

Now the question is…Is there a leak, or did someone let some freon out ?

Self contained unit's should not leak because they are all soldered connections, as opposed to a split system that has flare connections at each end of the copper line set that connects the air handler to the condensing unit.

You may also try manual low fan to get more heat if it does not do it automatically…But get the freon checked…Running low on refrigerant is not good for the compressor.

Let us know how it works out…

Steve~

November 27, 2009
2:35 pm
mtzakin2
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My system is self contained. It is one of three self contained systems in the boat all running off the same water pump and line. The other two systems with the same water source are producing normal cooling and heating. The outflow from the boat is in two separate places in the hull and both appear to have normal volume.

November 27, 2009
1:27 pm
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Steve Pooler
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Greetings~

Little chilly down there in Key Largo this morning ?

First I need to know if the system is a Split system or Self Contained all in one unit, and what you overboard water flow looks like ?

Steve~

November 27, 2009
12:48 pm
mtzakin2
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Guests

Have a 4 year old Cruisair factory system on my Searay with SMX controller.
Unit performs perfectly in cooling mode. In heat mode, fan runs normally and I hear the compressor running but barely warm temperatures at the register. Any ideas ?