Concentrtic venting

Weezbo

just from looking at it i wouldnt have thought that.it must put a heck of a draw on the first fittings it comes to....huh...i best pay Real close attention to The Chuck Shaw man when he comes up in June... some things are alot more critical than one would think....well sorry to hear it fried it buh thanks for dialing that piece of info in i put an ear plug in one ear while reading this ...so the thought dont just roll out the other side of my head :) thanks Lance

Al_11

Concentric Venting

I have a pinnacle peerless condensing boiler that has been in for 2 seasons. This year I got a call that it was leaking. When I arrived there was water under the boiler but upon further investigation I found that the water was coming down the combustion air pipe. I used a concentric vent to eliminate any more PVC sticking out of the house then necessary. Their was no problem the first winter but now it seems to be sucking the vapor in with the outside air. I have installed several of these vents but this is the first problem I have had with them. Has anybody else run into this and what did you find to be the problem?
Thanks for your time
Al

Jim Davis_3

I have seen many concentric designs that stink. If you are sucking in vapor you are also sucking in flue gases in your combustion air. I have seen these a definite problem on direct vent equipment especially mobile homes a gas logs. Can cause rapid deterioration of metal pipes along with unsafe combustion. Concentric plastic pipes just cause poor combustion.

mac

Is it a factory..

approved termination piece? If not, its anybodys guess if it will work properly. (Also your liability!)

If its approved, check with the vent/boiler mfg for recommendations.

Good Luck!

Ed Goldner, NJ

If the concetric

> I have a pinnacle peerless condensing boiler that

> has been in for 2 seasons. This year I got a call

> that it was leaking. When I arrived there was

> water under the boiler but upon further

> investigation I found that the water was coming

> down the combustion air pipe. I used a concentric

> vent to eliminate any more PVC sticking out of

> the house then necessary. Their was no problem

> the first winter but now it seems to be sucking

> the vapor in with the outside air. I have

> installed several of these vents but this is the

> first problem I have had with them. Has anybody

> else run into this and what did you find to be

> the problem? Thanks for your

> time Al

Ed Goldner, NJ

If the concentric

is terminated horizontally-through a side wall- is the boiler side of the intake on the concetric mounted above the three o'clock or nine o'clock position?

Al_11

concentric venting

I believe the comb. air is below the 3&9 position. I will not see it again for a few days but I can see it in my mind being below center.

Ed Goldner, NJ

It should be.......

> I believe the comb. air is below the 3&9

> position. I will not see it again for a few days

> but I can see it in my mind being below center.

Ed Goldner, NJ

It should be.......

above. Heat Transferr Prouducts recommends gluing the exhaust to the inside of the inlet, some manufacturers that supply partially pre-assembled concentrics, like Amana, give you the final choice...for cleaning out the intake.

hr

Say no to concentrics!

In my opinion I like to see 2 separate with some good separation. A couple feet at least. I like to see the exhaust out the roof, always, to avoid the freezing walls we have seen posted here time and time. Then the combustion air high on the side wall below the eves. Rare that exhaust gases could get sucked down and around the eves.

I wonder that when those condensors ramp the fan speed way down on low fire that the exhaust, with so little velocity, gets completly sucked down the intake with concen-trick kits??

hot rod

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Gary Reecher

Jim

Forgot to tell you at The January class. Have run into a plastic concentric that would shut down a Pulse furnace. Seems that on the inside that there is rubatex foam covering the vent pipe portion of the concentric to prevent sweating. Well the foam tore and was peeling back and would restrict the combustion air going to the furnace.

Guy_5

concentric

We recommend having the intake "Y" above the 3 and 9 O'Clock plane for just that reason: You have a warm exhaust pipe within a cold intake chamber. Should any condensation form, it would be preferable for it to eventually flow outward instead of down the intake.

If you think you might have cross contamination,
Some signs of contaminated intake air are:
A)Serious discoloration (rusting) of the gas piping within the cabinet.
Chaulky oxidation on the aluminum surfaces (blower, gas valve body).
C) For lack of better terminology-an exxagerated drool line inside the intake pipe where it enters the boiler.

You can always simply test the intake air as you would exhaust- drill into the PVC and insert an analyzer probe. The incoming air should be clean-NO CO or CO2.

PM_2

Munch T80M w/ concentric out roof

I've installed the only concentric vent my distributor has and it looks like the same inverted funnel style as in the HTP literature. When the boiler is running at 1200 rpm, it looks like it sucks in exhaust air on the leeward side of the intake.

Was this intake designed with the low flow rate condition of the T80M on minimum speed? Is this a problem? Any suggestions?

The system runs like a champ, no issues. Don't see mouse turds through view port, we'll see at annual PM time.

Glenn Harrison_2

Gary,

that can happen to any furnace using Lennox's concentric. I had a Complete Heat unit and several Pulses and G26 units all shut down due to the armaflex insulation splitting and pugging the intake elbow.

Our Lennox rep told us to throw away the armalex.

LanceRadiant

I killed the blower!

I've installed around 25 concentric kits for the munckin with no problems untill this one. We fired up the Munchkin early in the winter to heat up the floors during construction, So we dry socketed the kit together ......big mistake! The blower also sucks and if you don't have that baby glued tight it will suck the flue gas condesation through anywhere it can. So the acid in the condesation killed the blower in 2 months time.

Al_11

concentric vent

I appreciate all the info, you guys have given me a lot to consider. I think the first thing is to repipe so that it enters the vent above 3&9 o'clock. See what that does, if it is still a problem I will run a seperate intake and see what happens.
Thanks again AL