I have a 2007 nimbus. The bathroom and bay heating elements and not producing heat. When I turn on the Atwood thermostat in the bathroom zone pump #2 starts and the pex lines from zone #2 in the bay are both hot. Additionally turning on the thermostat and setting it for heat for the bedroom the heat works great from that register. I felt the lines at both the bay element and the bathroom element and they are cold. How can pump #2 be pumping and the lines to those heaters be cold. Initially I was told those elements off of pump #2 are in series. If so, how can one element be hot and 2 cold if the fluid flows from one to the other. Any ideas from the group would be greatly appreciated. I have spoken with Rudy Legett. First thought was check valve. Since bedroom works that is not the case.
Are the radiators truly in series where all of the liquid must go through each radiator?
Or are they in a series parallel configuration with most of the liquid bypassing the radiator to provide heat for radiators further down the line. If the latter, your radiator is air bound.
That is the question that I am trying to get an authoritative answer to. If it is what you think is there a procedure to purge that air?
"Normally" (which means older units than yours), the LR is on one circulator zone, the bath and storage bays are on another, and the bedroom on a third, so the fact that the bedroom registers have hot air would mostly be irrelevant to the behavior of the bath/bays. It would normally be an issue with either the zone valve for the bath/bays (but there would not be heat in the coolant lines in that case).
I don't know if the 2007's changed that (for some reason I seem to recall they have a HydroHot not an AquaHot).
Are you saying that you have heat in the lines going to the blowers, and the blowers are running, but there is no heat coming out? Are you SURE you're checking the lines to the bath/bays and not the lines to the bedroom? Like I mention, those are normally completely separate zones.
Still got your radiator key?
Not sure whether Nimbus plumbing is similar to U320, but in my coach I discovered, by accident, an unmarked/undocumented black metal valve in one of the passenger side pump bay area hoses leading to the register. That valve shut off flow to the registers in the bath and in the basement, so mine is plumbed in series. It's not a usual flow control valve you'll find in the rest of the system. Guessing FT put it there in case of work on the lower registers? Haven't seen one anywhere else in my coach (yet). I'll see if I can get a picture of it today. Woody.
You don't say! THAT is one of the better things about Foretravels. And the chassis design, and the efficient use of interior space.
Everything is totally documented and presented to you in 3-ring binders except for the stuff that ain't.
I wonder if Mr. Vogel checked the fluid level?
Here's the valve. It just spins and there's no way to tell what is on or off without activating zone 2 pump and feeling for heat. My guess now is that it may have been put in as a flow control valve to keep full hot air off the plastic tanks??? Woody.
p.s. the photo is rotated unintentionally. Left side is up.
In an Aqua Hot the bedroom coolant loop is independent of the loop that feeds the bathroom and the (perhaps) 2 heat exchangers in the wet bay. These heat exchangers should all be in series. The heat exchanger fan in the bathroom is controlled by the bathroom thermostat. The basement heat exchanger fans are controlled by the basement thermostat. Either of these thermostats can turn on the zone pump.
I have the same service valve Pyolet shows (we have the same year coach) but it would be highly unusual for that valve to be closed unless left so after some recent service.
The zone 2 pump may appear to be running but not actually pumping anything.
Rudy is probably best at troubleshooting this.
If that coach has a hydro hot then only has 2 zone pumps. I don't know how that works but I guess that it is supposed to.
Hydro Hot indeed has only 2 zone pumps. Pump 1, front of coach, living room. Pump 2, back of coach and basement, bathroom, bedroom, utility bay.
This assumes the builder plumbed it as most do.