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 > A/C Ducting - I'm going in...

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10forty2

North Carolina

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Posted: 06/08/18 09:11am Link  |  Quote  |  Print  |  Notify Moderator

So, I posted about this a while back, and the suggestions were that my A/C unit(s) may have loose seals. After checking all that, I haven't found anything that appeared to be loose. I also checked the partition that is supposed to be in place when installed for ducted vs. direct A/C. All look good and properly installed. And yet, I'm still having very little air flow through the ceiling ducts. And, in fact, just last week, I turned on both units only to get some styrofoam bits blow out of the ducts. When we first bought the rig, the A/Cs would get it cold enough to hang meat with temps outside being in the 90s. Air flow was very good then, which makes me suspect something is partially blocking the styrofoam plenum duct in the ceiling.

Soooo, I've purchased a 30' long borescope that wirelessly connects to an iPad or smartphone and I'm going in this weekend to see what's inside. Hopefully it's not a critter.......

to be continued...... (Oh, and I'll post pics if I get anything good!)


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Jeffe

Shady Shores, TX

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Posted: 06/08/18 11:06am Link  |  Quote  |  Print  |  Notify Moderator

That sounds like a perfect plan.
It would be hard to fix a problem when you don't know what the problem is.

Can't wait for your feedback!


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doxiemom11

New Mexico

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Posted: 06/08/18 12:29pm Link  |  Quote  |  Print  |  Notify Moderator

Will look forward to viewing your pics. Would like to see what it looks like up in the ceilings. Hope you don't find any critter.

ScottG

Bothell Wa.

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Posted: 06/08/18 01:06pm Link  |  Quote  |  Print  |  Notify Moderator

I'm looking forward to what you find as well.
On our last RV, the ducts weren't leaking but the were partially smashed.


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tropical36

Southwest Florida_USA

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Posted: 06/08/18 03:39pm Link  |  Quote  |  Print  |  Notify Moderator

10forty2 wrote:

So, I posted about this a while back, and the suggestions were that my A/C unit(s) may have loose seals. After checking all that, I haven't found anything that appeared to be loose. I also checked the partition that is supposed to be in place when installed for ducted vs. direct A/C. All look good and properly installed. And yet, I'm still having very little air flow through the ceiling ducts. And, in fact, just last week, I turned on both units only to get some styrofoam bits blow out of the ducts. When we first bought the rig, the A/Cs would get it cold enough to hang meat with temps outside being in the 90s. Air flow was very good then, which makes me suspect something is partially blocking the styrofoam plenum duct in the ceiling.

Soooo, I've purchased a 30' long borescope that wirelessly connects to an iPad or smartphone and I'm going in this weekend to see what's inside. Hopefully it's not a critter.......

to be continued...... (Oh, and I'll post pics if I get anything good!)

There's also the possibility of holes in the duct work, allowing the air to escape into the roof cavity. Just a thought.
When we got our coach after 9yrs, they worked OK, but I still spent hours cleaning the evaporator from inside the coach. Not much room to work and used a long handled brush and a shop vac.
As said, keep us posted.


"We are often so caught up in our destination that we forget to appreciate the journey."

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azrving

Quartzsite

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Posted: 06/08/18 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

My hoses were disconnected at the vent. Remove the outlet grills and see if the tape is damaged.

shastagary

minnesota

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Posted: 06/08/18 04:21pm Link  |  Quote  |  Print  |  Notify Moderator

check to see if you need to seal the ductwork right after the last vent in each duct run my duct extended at least 3' beyond the vent and was blowing into the ceiling wasting a lot of cold air it made a huge difference.

time2roll

Southern California

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Posted: 06/08/18 04:42pm Link  |  Quote  |  Print  |  Notify Moderator

Dang now there is another tool I must have....
My ducting is also very suspect.


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DrewE

Vermont

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Posted: 06/08/18 05:03pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Dang now there is another tool I must have....
My ducting is also very suspect.


Not that there's anything wrong at all with buying a new tool, but in many cases a lowly mirror would suffice for inspecting the ductwork.





down home

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Posted: 06/08/18 09:09pm Link  |  Quote  |  Print  |  Notify Moderator

Where our discharge vents were just hastily installed pieces of insulated board were there. Large gaps around them and some were never even put in place. Coleman was at the ACA rally last year when our main unit made a noise and seized up.
Three of them pulled the unit loose and replaced the large flat fan and with another set screw so it would never come loose again.
Then they unscrewed all four vents in the coach ceiling. Everyone of them was leaking most off the cold air into the roof area. They used alumanized tape and sealed up all the gaps.
Much of the cooled air was going back into the intakes as they weren't sealed at all either. Some pieces of foil covered fiberglass ducting was just stuck in place. They left big gaps between pieces and duct work.
After the finished the Mh seemed like a meat locker. No more icing up from recirculating cooled air through the intake.
As far as the gaskets between roof and heat pumps or A/C units they screws need to be checked every once in a while. They can loosen and the gasket will shrink too. I think we have had new unit to roof gaskets replaced twice in 12 years.
Last time in a sever rain storm going down the road we could not figure where all the water was coming from. It was the gasket. We tightened the screws and3 it stopped. In Shawnee the Coleman Folks replaced it.

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