Heating the Cabin - Reverse-Cycle AC/Heat

In heating mode, wouldn't you get PS LO when there was no water flow to vaporize the liquid R22? Which is similar to getting PS LO when the water temps are very low since the liquid R22 wouldn't absorb enough heat to vaporize.
 
Cabin temp is about 50 deg. Water temp is about 45 deg. Filters have been cleaned but will double check. This all seemed to have started with a low voltage issue when something happened on a windy day with my shore power. However, have 4 units & master & guest staterooms work normally. Thanks for reply.
 
Jerry,
sadly i think we need a set gauges on there. Do i think two units are short gas ?? NO but we can guess all day . Guages will tell us 100 % whats going on . But again filters are clean and there no obstruction under the couch blocking air flow ? Just talking outloud. Are fans in manual or auto mode. We need the fan set to the slowest position when the cabin and water are cold like this . Once the cabin heats up u can change that. Try slowest fan speed.

Also make sure u do have water flow tru these units . I think i mispoke with OSD. The unit is taking heat from the water ... no water flow no heat . Condensor ices up like an ice berg. Sorry OSD... Just because u have water tru some units u may not tru all I think u have two seperate pumps . Im postive u have 2 seperate pumps . so 4 units should have 4 streams outside the boat.

Rob
 
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"Just talking outloud"

Off topic, the owner of the company I am doing work for says this all the time. I corrected her at first by saying "don't you mean thinking out loud?"

How does one talk out loud? ;-)
 
I was expecting to have heat on my boat when in goes back in the water in April. Now I'm not so sure. I need to find out what the water temperature will be.

In Cool Mode, the air conditioner will operate most efficiently
in seawater temperatures below 90°F (32°C). At higher
seawater temperatures, the unit will operate, but at a
reduced capacity. A high-pressure shutdown may occur at
higher seawater temperatures.
In Heat Mode, the opposite is true. As the seawater gets
colder, there is less heat available, and the heating efficiency
is reduced. Full heating capacity is obtained at approximately
55°F (13°C) seawater temperature. Performance drops to
about 50% of rated capacity in 40°F (4.4°C) water. Below
this, the system pressure can be so low that the unit will shut
down on low-pressure fault. This problem is compounded
when the cabin is also cold. See the Fault Shutdowns and
Error Messages section.
Warning
Do not operate your air conditioning unit in water that is
colder than 38°F (3.3°C). Doing so could lead to water
freezing in the condenser coil which can cause damage
to the unit.​
 
hmmm.... This weekend I cleaned the strainer for my ac. Turned the unit on and noticed after about 10 minutes the discharge water flow starting to slow down and finally stopping. I shut the unit down and after about 30 minutes restarted and the same thing happened. I was thinking I had broken some gunk loose and it was cloggin up a line, then settling back after a period of time. Now I'm wondering if it has to also do with the cold lake temps... (or just call me an idiot and to go clean my lines)
 
Vince_nj1 said:
I was expecting to have heat on my boat when in goes back in the water in April. Now I'm not so sure. I need to find out what the water temperature will be.

We put our boat in the water after the ice goes out. Our lake water heats up fairly quickly as the sun shines. Still, when this signature pic was taken, the water temp was about 40 degrees. If you look carefully, you can see water coming from the reverse cycle a/c unit. We have no trouble keeping the cabin at 74 degrees which is warmer than normal, but temps still drop to the 20's in April so we do this to keep the water system from freezing. You will notice a difference in how long it takes to warm up your boat. It could well take 30 or 40 minutes to warm things up .
Click to expand...
 
Once a cabin is warm these units will work. Its the initial start up that takes its toll. A simple electric heater to jump start the process would be priceless. ( heater in the cabin )

Larry sounds like ur unit might be icing up. If flow reduces over time in heat mode the condensor is icing restricting water flow . When u shut it off the ice melts and all is good for a few. Might need to be checked. In heat pump mode refrigerant charge is way more critical then in cooling mode. That said , these units should not need freon unless there is a problem. U dont top off every year.


Rob
 
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