Air conditioning - winterizing question please

[AGLyme]

Almost complete with the winterizing process on my 2013 - 31cb. There are 2 units on board. Questions please:

1) do both units need to be running before the pink is run through the system ?

2) does air con need to be on or will the heat function suffice ?

Thank you in advance.

 

[Jesperjo]

I assume you’re talking about the reverse cycle A/C correct?

According to the R-31 manual, one of the sea strainers serves only the raw water washdown pump, and the other serves the AC units. That means you would winterize both together. Running just one of them would suck water into that unit and let it be expelled through the drain, but the other one would not be affected, so you should run both. They may not need to be run together, but it probably would be quicker to do it that way and more sure that you got both of them done properly.

However, carefully check which seastrainer has water going through it when you run them. On our boat, the manual has the hookups saying one thing, and the way the boat was built is different. They aren’t hooked up the way the manual says they should be.

Heat function will suffice. The unit needs to suck water through the sea strainer and the heat does that.