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Old 02-26-2010, 05:14 PM   #15
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Tom Hill, welcome to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Thank you for posting of the check valve tip. Good luck and keep us posted.

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Old 02-26-2010, 05:48 PM   #16
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I thought the opposite, i.e. that pump1 circulates only to all the registers it is serving, and pump2 likewise circulates only to its registers. Note that this is not equivalent to zones which relate a tstat command to an area of the coach/basement. I have a 450, 3 zones, two pumps. The basement zone has its own tstat and lives off one (or the other) of the pumps; it can call for heat (air) while coach zones are not blowing, but coach registers fed by that pump will contain hot coolant.

I didn't see above where the pumps were visually checked for actual operation. Roger noted to look at the pump(s) to see the mechanism turning inside the clear plastic housing. If the pump is turning then the obstructed line is the next thing to check; either check valves or kink. Waaay more likely is a bad hookup on the board so the call for heat (air) is not relayed to the correct pump and the respective pump isn't circulating.

p.s. if somebody can say that pump1 circulates to all registers of the coach (kinda the original question) then my post is all wet, and please vilify me eternally to your grandchildren.

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Old 02-26-2010, 07:48 PM   #17
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Aqua-Hot - Heat exchanger not working

I have attached a drawing showing general layout for heat exchangers. As you can see by the drawing, the heat exchangers are in series. The Hydro-Hot (includes model 450) has two circulation zones. If there is a stuck check valve or a kink in a zone, the entire zone will not be making heat.

Every coach manufacturer lays out the heat exchangers a little differently.

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Old 02-28-2010, 09:33 AM   #18
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Thanks Roger
It will be next weekend before I get a chance to check out the Aqua hot but, this is where I am confused. If pump 2 circulates through "zone" 2 and "zone" 3 why the warm air in zone 3 and cold air in zone 2? I will have to see about gaining access to the heat exchangers to check for warm fluids flowing through them.
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Old 02-28-2010, 10:04 AM   #19
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Re: Aqua-Hot - Not Hot

I also do not understand why you have heat out of zone 1 (front) and zone 3 (back) but not out of zone 2 (middle). If you start zones 1 + 3 it should start both pumps and circulate coolant through zone 2.

Let us know what you find

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Old 02-28-2010, 11:32 AM   #20
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I beleive Tom may be correct on this. Check the lines comming out of the Aqua Hot to see if they are hot, if they are not do as Tom said and tap the check valve to loosen it. This is what I did on the same problem.
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Old 02-28-2010, 11:52 AM   #21
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Could be that Zones 1 & 3 are plumbed off one pump and Zone 2 off the other?
For me, this is one of those things that to fix the inoperative portion, I'd be better off starting w/a diagram (maybe use the coach zone diagram above) and diagnose the mfgr's layout of each part- thermostats & where they call for, pumps and where they are plumbed, individual registers. Then save the diagram w/the AquaHot docs.
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Old 03-04-2010, 04:58 PM   #22
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Do you have a register behind you driver seat?
If so' I have some information that may solve your problem.
I will also be at the BAC rally in Abq. Hope to see you there.
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