Coldest heating temp. ?

[grayzone]

Coldest heating temp. ?

We put our boat in the water(2003 380DA), in Spanish, Ontario. Started the AC circulating pump and the foreward and aft. AC units. It was only 30 F or -2 C at the time. Cabin temperature was 0 C or 32 F.
Wasn't getting any water discharge so I turned it off. The boat is new to me, so I have a few questions. What's the lowest temperature anyone has heated from? Should I have discharge coming out, all the time, when in heating cycle? Should both the forward and aft AC discharge run together or will they run separately?

 

[mainstream]

Coldest heating temp. ?

We put our boat in the water(2003 380DA), in Spanish, Ontario. Started the AC circulating pump and the foreward and aft. AC units. It was only 30 F or -2 C at the time. Cabin temperature was 0 C or 32 F.
Wasn't getting any water discharge so I turned it off. The boat is new to me, so I have a few questions. What's the lowest temperature anyone has heated from? Should I have discharge coming out, all the time, when in heating cycle? Should both the forward and aft AC discharge run together or will they run separately?

Hello the reverse cycle heat pump will work with 40 to 45 degree water you should see water when ever the unit is running I had 30 degree last Saturday with 42 degree water and my boat was a steady 68 degrees. Sounds like you either need to prime the pump for system check sea caulk or you may have a bad pump. When the sea water drops below 45 you start loosing heating capacity. I hope this helps

good luck with your new boat

 

[Xplicitlnck]

The water temp in my area right now is cold maybe around 45. I hqve my heat running and it gets pretty warm inside.you should have water discharge all the time. Make sure your seacocks are open and if so make sure strainers are clean if there both good then check to make sure your water pumps are getting juice and operational. My guees they filled the system with pink and closed the seacocks while winterizing. You may also have to either take the boat for a ride at cruise speed or prime the water system with a hose.

 

[grayzone]

The Seacocks are open, strainers are clean, water temp is probably 30'F or 0'C; seeing as we still had ice yesterday. I'll check on the priming of the pump tomorrow when I'm down.

 

[Xplicitlnck]

The lines arnt frozen are they....

 

[pchanson8]

I have a 340 that I always need to release the air lock every time I put it in.

 

[grayzone]

I guess I should have read the manual first

"In heat mode, the opposite is true. As the seawater temperature gets colder, there is less heat available and heating performance drops. Full heating capacity is available in water temperature as low as 55’F (13’C), but drops to about 50% capacity in 40’F (4.4’C) water. Below this, the refrigerant pressure can be so low that the unit will not produce heat, (or may shut down on low-pressure fault, if this option is installed)."

thanks for the help I guess we need warmer weather

al

 

[pchanson8]

It will always pump water... If you are not pumping you have a air lock or another problem.

 

[Creekwood]

You may need to run the boat over the water to prime the pump. I always find my system pump wont kick in on its own after the boat has been hauled without being run. There may be a way to prime it manually, but I find just going for a run gets it ready to go.

Also, you need to be careful running it in too cold weather. Its a reverse AC/Heat unit. That means when you are heating, there is still a cold side and that cold side is dissipated into the circulating lake water (which is why its not efficient at cold water temps). If its too cold, the circulating water will freeze in the exchange tubes. I learned that after I froze mys system running the heat while I was winterizing all the other water systems on a really cold fall day. That is why the system wont run in too cold conditions. But sometimes it will try and you don't want to damage things so follow the manual.