Oasis flush

[Richpatty]

Totally agree…. But we will own the RV 9 years this month, so it maybe time.

 

[Texas Clodhopper]

I am in the process of replacing the Oasis DM12 module. What a project that has turned into. I think I have everything tightened up, so I'll do the transfer fluid tomorrow. I will start by blowing any remaining transfer fluid and or water out of the system before adding the transfer fluid.

 

[Richpatty]

OK! I completed the Oasis flush today. Took several hours, mostly in getting pieces of hose to fit my pump. I should have spare RV hose around, but I don't. Add it to the list.
I had called ITR (they answered my call! ) and they said that I could just use a pump to pull the fluid out and then push new fluid back in. That did work well, but I did have to disconnect both heater lines (one at a time) and push some low pressure air through to get out several more gallons of fluid. The fluid was a nasty color of brown... I also found that my bucket that I pumping the fluid into had a small hole {sigh}so hopefully it wont kill the grass (weeds).

Once that was done, I then could reconnect everything, reverse the pump hoses and push new fluid back in. That part went quick.

As you can see on the NE-S, everything is right at the door, so I do not have to crawl into the basement to get there.

Anyway, I don't see any leaks, which was one of my concerns and I was able to run it with all three pumps running and it got everything hot. It took 18 gallons, although I probably went about gallon too high as the overflow tank dropped a bunch on the ground. Oh well. The NE-S takes about 14 gallons, so the other three were the heating lines. I have two gallons left, which I will keep as spare.

Glad that's done. Not sure I would want to do it again, but I did learn a bunch in the process.

 

[Texas Clodhopper]

@Richpatty I used a section of clear hose on the outlet side to verify I didn't have any air left in the system. Brian told me to run the summer loop pump after my initial fill, and I could hear the pump cavitating several times. This took about 45 minutes before I stopped seeing bubbles and the pumps stopped cavitating.

 

[Richpatty]

@Richpatty I used a section of clear hose on the outlet side to verify I didn't have any air left in the system. Brian told me to run the summer loop pump after my initial fill, and I could hear the pump cavitating several times. This took about 45 minutes before I stopped seeing bubbles and the pumps stopped cavitating.

I did not see that problem… probably due to the different model of my system. When I filled up the unit, it also filled all of the lines and pumps…

I just pumped in the fluid and turned on the pump override which ran all three pumps and it pushed out any remaining bubbles.

 

[Roadglide117]

Did you have to any flushes to get the old fluid completely rinsed out?

 

[Richpatty]

Did you have to any flushes to get the old fluid completely rinsed out?

I didn’t…. I figured I got out 95% of the old fluid with pumping it out and gently (10-15 lbs) blowing out the rest with a compressor. I thought about using water like some have said (and ITR says as well in their instructions), but didn’t want to leave any water behind and weaken the new fluid (although it was probably unlikely). Some folks use new fluid to push out the old, but at the cost of the fluid, I didn’t know if it was worth it.

I spoke to ITR later and they agreed that you don’t have to get out every drop of the old fluid, especially if it still met the PH level that is recommended (mine did).

Hope this helps.