How To Replace a summer loop pump in a ITR OASIS Hydronic heater

[Jim]

The best one to answer that is going to be ITR but I've become all too familiar with this contraption due to issues. If I were you I would replace all three pumps and just new them all up. Get a 5 year service kit and new all that up. Then go from there. You don't know the history of the care of your OASIS I don't believe so this may just save you grief later. If you're attending a rally that ITR is participating in then they may be able to do all of this for you but it's not that hard. The link for the US solar pump vendor is probably in this thread and definitely on this site, order 4-5 pumps if you're going to replace 3.

In two hours you can be done with the above, maybe three. Then we can start looking at other items such as electricity, relays, etc. which I hope are not an issue but not hard to replace either, I had one that was bad, simple bad connector. Cheap and easy but highly doubt you have that problem.

Zone 1 and 2 are furnace/heat providers
Summer loop is hot water (pump with a stupid name)

I had the summer loop (your right, stupid name) replaced at Newmar about 6 months ago. And while I have no problem replacing the 3 pumps, I don't see the reasoning behind it if the pumps are not the problem.

As you mentioned, Zone 1 & 2 pumps are furnace/heat providers, I don't believe they get any assistance from the summer loop normally or in bypass mode. So if I'm getting heat in the coach, these two pumps have to be working.

That leaves the summer loop. It could have failed and is getting assistance from pumps 1 & 2, but if that is the case, then pumps 1 & 2 have to be working.

So the majority of pumps are working otherwise I couldn't get heat in both coach zones as well as hot water from the summer loop. Edit: Also, and I forgot to mention this earlier, but the Silverleaf reports "Zones OK", "Heater OK", and "No AC Input". When the summer loop died last time, the Silverleaf showed "Zone Fault". And while the Silverleaf doesn't tell me which zone is faulted, it does report when one is.

Or have I missed something?

 

[Neal]

Well, my first question based on your luck with Newmar etc is "was it really replaced?" and also did they use the old style pump which has known issues with reliability or the newer style (new style is smooth and no cooling fins).

You could crawl in and open the panel to view the pumps, won't hurt to do that and see if you can hear or feel them working and also get a picture and share here if desired and we can tell you if old or new style pumps.

 

[Jim]

Well, my first question based on your luck with Newmar etc is "was it really replaced?" and also did they use the old style pump which has known issues with reliability or the newer style (new style is smooth and no cooling fins).

You could crawl in and open the panel to view the pumps, won't hurt to do that and see if you can hear or feel them working and also get a picture and share here if desired and we can tell you if old or new style pumps.

I'm thinking of having a BBQ today. Why don't you drop by for a burger a little later?

 

[Neal]

I know someone not far from you, well, maybe in the same state and runs a mobile RV tech operation for private clients, cough, @NWIP

 

[Jim]

I know someone not far from you, well, maybe in the same state and runs a mobile RV tech operation for private clients, cough, @NWIP

lol, have you seen that guy? He's so tall, part of him would be hanging out each side of the coach!

 

[J&JD]

I’m pretty sure that turning on the bypass switch does just that, it bypasses the pump control and turns them all on at the same time. That is why, if you have no or intermittent hot water or heat in one zone, everything seems to work. You could have 2 of the 3 pumps be bad and the system would work with just one pump, just not as efficiently. Perhaps @Neal’s advice to replace all 3 pumps might be worth a shot.

 

[Jim]

I’m pretty sure that turning on the bypass switch does just that, it bypasses the pump control and turns them all on at the same time. That is why, if you have no or intermittent hot water or heat in one zone, everything seems to work. You could have 2 of the 3 pumps be bad and the system would work with just one pump, just not as efficiently. Perhaps @Neal’s advice to replace all 3 pumps might be worth a shot.

I'll call Oasis tomorrow and get their opinion.

Assuming NOT in bypass mode, it's hard for me to understand how 1 (or even 2) dead pumps would stop the coach heat from working. I mean, I get it that the summer loop will stop the hot water dead in its tracks, but not the coach heat.

I see that happening if all 3 pumps were dead, but if that were the case, none of them would work in bypass mode. So given not all the pumps are dead, why aren't the remaining pumps coming on when the distribution board calls on them?

I really don't think the distribution board is making the call.

 

[Joe Hogan]

Been following this thread for a while now,
Seems that if the pumps work in bypass mode then it is not a pump failure. Unless as stated above that the bypass is forcing another pump to do the work. If you can get a wiring diagram maybe you can sort out what is happening In bypass.
Putting a hand on each pump during bypass might help see if it is a pump issue Otherwise it might be a thermostat or other component.

My $0.02

 

[Jim]

Been following this thread for a while now,
Seems that if the pumps work in bypass mode then it is not a pump failure. Unless as stated above that the bypass is forcing another pump to do the work. If you can get a wiring diagram maybe you can sort out what is happening In bypass.
Putting a hand on each pump during bypass might help see if it is a pump issue Otherwise it might be a thermostat or other component.

My $0.02

I will check with Oasis support in the morning and I believe we will have an answer shortly afterward.

 

[Neal]

In my opinion, you need to do the troubleshooting if you really want to put an end to this. You need to pull the pump distribution panel off and determine what's going on with the pumps when override is turned back OFF. You probably have one bad pump, the "summer loop". If you don't have spare pump(s) on hand, you should have ordered them yesterday, i.e. you need to have two spare pumps on hand at all times, in my opinion.

Let me help motivate you. The pump box is green, like a John Deere. Now let's get to it and get the job done!

Select the 12V option, set your quantity, and let's get vacation (construction work) in progress. We have land to move, buildings to construct, things to paint, paving, plowing, and all sorts of relaxation already!

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