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

[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 Dutchstar]

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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[flyboy013]

Here is a link to the service manual. Note that the bypass switch activates the pumps for the two heating zones and not the summer loop pump. The heat exchanger for the hot water is in the distribution box with the pumps and activating the two heat circulating pumps circulates the transfer enough to also provide hot water.

The bypass jumper (activated via a switch mounted on the top of the distribution module zone board) can be used in conjunction with a purge pump to initially fill the system with coolant. When this jumper is activated, the Loop 1 and Loop 2 pumps turn on and push coolant through the entire system. Once the system is filled and purged of air, the bypass switch must be turned OFF.

 

[Neal]

Probably the same as the manual in the Resources section of this site, various ITR documents there to help.

ITR Oasis Service & Troubleshooting Manual

ITR Oasis Service & Troubleshooting Manual

rvforums.com

 

[Texas Clodhopper]

https://rvforums.com/resources/itr-oasis-wiring-diagram-with-pictures.72/download

 

[Jim]

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.

I've got 3-spares on board right now, so having pumps is not a problem. But I don't believe the pumps are the problem, and I don't want to replace pumps that don't need replacing, right?

Hang in there, we're quite close to having an answer when the Canadians start answering the phones tomorrow. And at that time, we'll know whether @NWIP will need to come by or not. . .

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!

Lord man, it's dark, I can't see anything in there. Can't we at least wait until tomorrow?

 

[Neal]

I put on the @NWIP light pointed to the sky, he should be suiting up soon, problem is it's cloudy here! And due to various reasons he has a hard time finding phone booths these days!

I will give you a $1 to just replace the summer loop pump! And if it doesn't fix your problem I will double it!

 

[Jim]

I put on the @NWIP light pointed to the sky, he should be suiting up soon, problem is it's cloudy here! And due to various reasons he has a hard time finding phone booths these days!

I will give you a $1 to just replace the summer loop pump! And if it doesn't fix your problem I will double it!

How do I know you've got the money? I'll need to see it first!

 

[Texas Clodhopper]

I will give you a $1 to just replace the summer loop pump! And if it doesn't fix your problem I will double it!

I guess replacing the summer loop pump has usually resolved the issue we've experienced, it's become our go-to answer even when it makes no sense.
I think Jim doesn't want us to see any pictures of him wedged in the Oasis bay is the reason he is holding out.

 

[Jim]

I guess replacing the summer loop pump has usually resolved the issue we've experienced, it's become our go-to answer even when it makes no sense.
I think Jim doesn't want us to see any pictures of him wedged in the Oasis bay is the reason he is holding out.

Well, I really want it to be that simple. But. . . I just don't believe it's the summer loop. I don't see how a malfunctioning summer loop pump would stop the rest of the system from working.

But I hope I'm wrong, and tomorrow we should have an answer.

Meanwhile, how long do you think it'll take @Neal to borrow 2 bucks?

 

[Texas Clodhopper]

Most likely he'll need to put up his airplane as collateral or get a payday loan.

 

[Neal]

How do I know you've got the money? I'll need to see it first!

I'm working on other issues first! I've tried for years to tell @NWIP the phone booth thing is out. He watches too many movies and is just not going along with it. I solved the problem, problem is there went the big money I was putting in towards the labor costs.

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