High Wind causing Limit Switch to Trip now glacier after installing elbow pvc help!
I live in Northern Minnesota and 282 feet off of Lake Mille Lacs (big lake) on 3 sides SO, the wind can get real bad
from the North and Northwest primarily but can come from the South and East (kinda rare but does happen.) I don't have much for wind breaks and would take years for trees to grow tall enough to help.
I live in a Manufactured triple wide home where the exhaust vent is "roof terminated," and can not be moved without great destruction. The vent limit switch tripped once and was replaced but service guy suspected wind and I agree as it was 50mph and gusts to 80mph at times.
SO...he recommended that I install a pvc elbow and point it to the east...I did and it helped however winter came and now I'm knocking down little pointy glaciers from the dripping condensation coming out of the vent. Can't tell you how dangerous it is to be out in -14 weather let alone finding a good spot to plant your extension ladder so it's stable
The vent resembles a candy cane top so the dripping is straight down to the shingles and builds it's way back up to the opening of the pipe...I haven't let it go so I do not know if it would in fact grow up far enough to actually block the vent but I didn't want to take the risk and lose my very necessary heat.
I gotta come up with something that will block the wind, YET allow the condensation go back down the vent and allow the pump to shoot it down the drain. I'm thinking of cutting a pipe in half lengthwise and somehow securing it so that it will shield only the wind from the N, NW and yet leave the pipe open and able to vent.
I'm looking for any advise you have, I've looked at "high wind vent caps," but I'm concerned that they will freeze up and clog on me? I'll await your responses and greatly appreciate your expertise and time, thanks.
Your guy should be able to talk to tech support. Using an unapproved termination isn't something I would do.
since this unit is vented in pvc/abs, you CANNOT use a metal cap on it as it will rust among other reasons!!
can you post a photo of what it looks like?
I have not heard of a vertical pipe having winds affect it, but horizontals most definitely.
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I posted a picture of both the intake and exhaust pvc pipes and you can see the condensation blowing out of the exhaust toward the easterly direction if you look closely (it's 12 above so we're having a heat wave.) You can also see a small glacier that's beginning to develop on the shingles, I already knocked the taller one down 3 days ago.
Originally Posted by pacnw
Like I said it gets so tall that I'm afraid it will actually go high enough to close off the opening of the exhaust (just didn't want to let it go that far..might not actually happen or cause a problem.) Everything works with this configuration, no problems except the glacier.
I could just run heat tape up there and plug it in every winter so no glacier but I'm hoping for another solution, such as just a pvc pipe cut in half and attached to the top of the existing pvc thus blocking the wind but allowing fumes to escape and condensation to run back down pipe to the drain? Hope the pic comes across and is helpful, thx.
I would cut that elbow off asap on the exhaust, and get a bushing that is 2 inch, to 1 1/2 inch then a foot long piece of 1 1/2 pvc. The tech who was there should have done something like this, or find the reason the vent limit is tripping. Have him perform a combustion test as well
Originally Posted by mettao
I agree that the elbow will have to go but I'm left wondering if I do what you suggest above how this will help keep the wind from cutting off the exhaust from the 1 1/2 inch pipe, I realize going to smaller diameter would help if it was freezing inside the pipe but that is not an issue it's the negative pressure (if I'm saying that right) overtaking the positive outgoing exhaust. The height of the existing pipes is ok and with the way the wind blows at times the snow doesn't build up or stay on the roof it blows off and if it didn't I would have to get out the roof rake, but so far no issue with any blockage from snowfall, just wind. Thanks.
Originally Posted by tiger man
Sounds like a single pipe system. Whee is the combustion air coming from.
Some units must have both terminations on the same load plain (wall or roof). If it is the roof, then the exhaust straight up and the intake "candy-cane". This arrangement keeps the PS happy as no differential pressure is possible unless blower induced...happy pressure sw.
If you only have one pipe, get two if the the manufacturer allow it of course.
Thanks for the reply. I do have two terminations on the roof and the intake already had a pvc elbow "candy cane," config on it (but since it's the intake it doesn't give me any problems with condensation.)
Originally Posted by BadgerBoiler MN
The icing/glacier problem only began after putting the same pvc elbow configuration on the exhaust pipe for the high wind issue. So, while it fixed one issue (vent switch tripping) it has caused another with dripping condensation freezing and building up on the roof.
I keep plugging away for a solution & did an internet search, found what's called a "Concentric Vent Kit," now I'm wondering if this might be a solution? This is where expertise comes in handy Thx again.
The concentric will change nothing from the original configuration other than combining it onto one.
You should NOT have both in the candy cane shape, it will cause more issues than it fixes!!
Can you call my boss and tell him how dangerous it is to work in -14 on an extension ladder?
So why is the vent pointing down if the guy said point it east?Just so you know...many mfr's make high wind kits. That's why I wrote your guy should be able to talk with tech support.
So when the vent limit switched tripped. It was the first time you were having wind gust?