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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #1  
Old 12-09-2019
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chiplamb chiplamb is offline
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Default M380 Hurricane Heat Plumbing Diagram

Is there a diagram of how the heat loops are laid out in an M380 Hurricane installation? The 2007 Service Parts Book suggests that there are two distribution manifolds but I do not see these. Further, in looking at my convector plumbing under the bathroom wardrobe I am a bit confused as to flow to and from these two small units. In the event I need to put one big unit under this to feed both vents, I want to try and keep the balance.
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2004 M380 100k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-09-2019
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I think Don posted some good detail on this. There are two loops with parallel flow off of one outlet from the heater.
One of those loops has a ball valve supposedly to throttle the second loop to create flow balance. I think Don pointed out the ball valve was placed from the factory in the wrong loop.
I think there is a forward loop and rear loop.
Do you get heat on both loops if you turn up the temps on the HVAC controller? Front heat-exchanger is adjacent to stairs and then passenger side under computer desk or other furniture. Are the outlet air temps similar to what you find in the rear?

Doug
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Old 12-09-2019
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Doug, it is currently good but I'd like to see it on paper if such a thing exists as with earlier BBs, particularly if I can't get good replacements for the small convectors and need to put one larger unit under here to heat the bath area. I cannot find this in my schematics (or anywhere else) and the rats nest of loop under the wardrobe is confusing.
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2004 M380 100k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-09-2019
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10-4.
I believe my ball valve for "tuning" the heater loop back pressure is on top of the diesel tank next to the Hurricane unit.

Doug
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Old 12-09-2019
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Mine is where Don put it, sort of half-open. See his pix in that posting.
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Chip Lamb
Augusta, Georgia
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chip@collectorsco.com / 804-357-4926
2004 M380 100k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-10-2019
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On Chip's bus there are two control valves, a factory one on the back loop and one I installed on the front loop. Most of the radiators are on the back loop, including one that is on the front thermostat (the one under the refrigerator). Only two are on the front loop. I have absolutely no idea how the flow goes in terms of the toilet, bathroom, bed, and refrigerator units.
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Old 12-10-2019
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I called Don earlier with some vindication for his adding a valve to balance the heat loops - apparently BB screwed up and pinched off two hoses to one of the little heat exchangers which severely restricted warm air on the rear heat loop (fridge, bath, bedroom).

This loop goes to the fridge heater, then to one of the tiny units under the drawers, then to the bedroom, then to the other tiny unit, then back. This is odd as the fridge unit is wired to the front zone, which is dash, desk/table/sofa, fridge insofar as the fans are concerned. Maybe this is the cause of some of the short cycling (i.e. needing to have the chair over the vent) as without both zones going, the rear loop is just hot? I don't know...

In any event, MCC cannot provide replacements for the units under the drawers in a timely manner, so I will be simplifying matters somewhat in this area. Aqua-Hot supply a "Cozy III" 8kBTU heater with a ducted front option:

https://hydronicheatingwarehouse.com...heat-exchanger
https://hydronicheatingwarehouse.com...lenum-assembly

I'll just run some 3" dryer duct to the grilles once this is plumbed and installed. Should be more than sufficient. Probably what BB ought to have done in the first place. I'll feed this, then the bedroom, and back to the fridge area whereever the tie-in for the return is.
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Chip Lamb
Augusta, Georgia
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2004 M380 100k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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Old 12-10-2019
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That sounds like a good solution.

Doug
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Old 12-10-2019
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Quote:
Originally Posted by chiplamb View Post
apparently BB screwed up and pinched off two hoses to one of the little heat exchangers which severely restricted warm air on the rear heat loop (fridge, bath, bedroom).
You should post the pinched hose pictures. I doubt this is the only coach they built that way.
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Don Bradner
Current: No RV at this time
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Prior: 2004 M380 Double Slide
Prior: 1990 WB40 "Blue Thunder"
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  #10  
Old 12-10-2019
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Quote:
Originally Posted by DonB View Post
You should post the pinched hose pictures. I doubt this is the only coach they built that way.
Here are three - a broad overview of the area under the wardrobe across from the sink, then two closeups.

I don't recommend removal of the drawers just for giggles, but if you must:

1. remove drawers (tabs on slides)
2. remove 2 countersunk screws either side up front
3. remove small carpeted piece at ceiling (just squeezes in/out)
4. remove back carpeted panel of wardrobe - just pressed up against some wood, you will have to wiggle it quite a bit.
5. remove the wood the back panel was pressed up against as this pushes down on the drawer cabinetry - many screws
6. remove the left closet door
7. remove the screws holding the carpeted door check for the right closet door and swing it all the way open into the bathroom (bathroom door open)
8. remove the L brackets from either side of the back of the drawers
9. start wiggling the drawers up and out. I had a piece of engineered wood flooring come up and some linoleum that was under it bulge a bit, need to fix that.

The drawers can only go here or on the bed, they do not fit through the kitchen doorway. You might however want to see if your hoses are pinched in here if you're having a flow issue to the back, these two hoses were the ones to the front heater (out into the hallway/bath area).
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Chip Lamb
Augusta, Georgia
E-MAIL OR CALL - NO PM
chip@collectorsco.com / 804-357-4926
2004 M380 100k/22xx hours
1987 FC35 TMU/42xx hours
Former: 90 SP36, 92 WB40, 85 FC35SB & others
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