Question about Goodman GMS90703BXA Heater

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Condensation running down old vent pipe running to roof.

Vent pipe from old furnace was left in and the new PVC pipe has been run up through it . We are getting condensation running down the old metal vent pipe and can't seem to stop it.

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  • dwkcool May 11, 2010

    sound like the pvc was not ran out far enough and making condensation in the old metal pipe

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This is a condensing furnace and is ment to condense. You will need to pipe away the condensate using a hose and maybe a condensation pump. It is unclear where the combustion air pipe is going? Are you using room air? or do you have a second pipe going up the old vent as well?

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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What is the minimum vertical vent distant from top of water heater to top of cap. Water heater is stand alone outside furnishing water for military force provider showers unit.


Generally 40 feet for ordinary atmospheric-vented household water heater...
Straight run to roof.
Atmospheric means no power vent... just hot air drafting upwards
Google search: gas vent height code

Atmospheric venting code depends on 4 basic factors:
Diameter of vent--- bigger vent, more draft
How many water heaters are connected to same vent
BTU per hour rating of water heater-- the more gas that is burned per hour, the bigger the vent needs to be
How straight the pipe is -- are there any horizontal or lateral runs
http://www.ameri-vent.com/files/assets/files/1366372183_Sizing26ApplicationGuide1.pdf

http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf
http://waterheatertimer.org/pdf/checking-the-draft2.pdf

Other factors can include
-wind conditions... higher wind across top of vent pipe on roof can reduce draft, and cause downdraft that blows deadly CO into same room as water heater
-vent termination near high walls, trees, high roof peak etc will reduce draft or cause downdraft
-amount of incoming air supply... if water heater is inside a closed room, then there is no air to draft up the pipe, burner will shut down or burn lazy yellow instead of clear blue
-stuff piled up around water heater that obstructs air intake
-dirty air intake screen that reduces air intake
-vent fans inside same room as water heater that pull air down the vent and cause reduction in water heater draft
-generally elbows reduce draft by 10%
-vent cannot terminate near any window door or air intake for another gas appliance
-bird build nest on top of vent pipe after vent termination falls off
-highly acidic gas by-product causes large amount of condensation inside pipe that burns hole in pipe or drips down and damages combustion parts...blower and inline condensate trap and drain might be required
-multiple water heaters installed on same vent line.

Gene
Water Heater Timers Save Money

Mar 27, 2015 | Water Water Heaters

1 Answer

New goodman 80% gas furnace leaking condesation down exhaust vent


it could be condensation. or poor seal at roof. probably the seal at roof. also check the larger copper line is it sealed good? if any spot is not this will cause leaking when in cooling mode. maybe dripping from line onto vent.

Jan 28, 2014 | Goodman Manufacturing Goodman 60,000 btu...

1 Answer

My high efficiency furnace has water (possibly condensation) running down the air intake pvc pipe into the furnace and all over the burner, gas valve, and wiring.


First, check the drainline from the furnace. You have a 90% gas fired furnace. Where 80% furnace has 1 heat exchanger, yours has 2 heat exchangers. And the second heat exchanger will cool the exhaust enough, that it ends up below the dew point, and your furnace outlet/exhaust will condensate. This drain is probably stopped up. Now, I've installed and service many of these systems and I've only seen the piping at the roof you described once. And that was when the roofers replaced the roof, damaged the furnace flue pipe, and tried to repair it themselves. Normally, and this may not apply to yours, we tie in the exhaust/supply lines about 2-3 ft. above the furnace. Then 1 pipe goes through the roof. Thus 1 pipe is a kit that has an inner liner & outer pipe(2 pipes in 1). Now I'm not sure if this is a problem or normal for your system, but it may be worth looking into. You should be able to find it in the installation manual, or call a local parts house that sells your brand, or as your tech. And if it's just your drain, forget all about the piping I mentioned. Hope this helps!

Mar 08, 2017 | Goodman Heating & Cooling

1 Answer

I have a American Standard furnace Freedom 80 Mod# AUD080C936H3 and am looking for a manal or can you tell me how the exauhst is done. Can I use PVC


Hello, The only time pvc is allowed is if the Furnace is 90% or greater in effiecency, the combustion gases are cooler due to the fact that two heat exvhangers are used. One pipe will be you air intake and the other the exhaust and they can be routed through the roof or sidewall. If the Furnace is 80% then you must use double wall vent pipe and have it connected to either a liner in a chimney or routed through a roof but pvc can not be used.

Aug 28, 2011 | American Standard Heating & Cooling

1 Answer

How many BYU is a Lennox G40UH (x) series furnace? And can it be vented with PVC? Thanks alot!


The Btu rating for this furnace is 40,000. Since the furnace has a 3 /34" metal flue collar on the top of the unit, you can not use PVC pipe to vent it. Only 90+ efficient gas furnaces can use PVC pipe for venting and the also come equipped with a condensation pump, which yours doesn't.

For more information on your furnace and how it's to be safely installed and vented, here is a link to the installation manual http://www.greenwoodheating.com/products/manuals/gasfurnaces/G40UH.pdf that you can download and print.

Hope this helped answer your questions?

Mar 18, 2011 | Heating & Cooling

1 Answer

Can I vent my ultra v tech 80 propane gas furnance with pvc so I can do away with chimney


Generally, the furnace must be at least 90+ efficiency to be able to use PVC pipe. In addition, high efficiency gas furnaces require a condensation pump, to pump excess moisture out of the furnace. If yours has always been venting up a vent pipe, then NO, you can't use PVC pipe.

Hope this helps you.

Mar 14, 2011 | Heating & Cooling

1 Answer

Dont have a book to tell me how to install heat exhaust pvc or tin


most furnaces require 4 inch vent pipe to be installed ... you can use pvc as long as it is rated for the temperature... there should be an obvious hole in the furnace where the enducer draft motor pushes the exhaust... if this is a upflow unit in the closet you will need to connect to the bell housing of the exhaust and start running your pipe up and out side .you will need double wall pipe rated for heat and or rated pvc if installing pvc... once outside make sure if on rood you have a roof jack for pipe to go through and a collar around pipe to keep water from running down and then a cap on pipe ....if it is a horizontal unit done the same way except your already in attic and don't have a as far to go it can run vertical and horizontal try to minimize your 90 degree turns and is best to keep it angled to prevent moisture from buiding up in pipe...

Jan 25, 2011 | Goodman Heating & Cooling

1 Answer

Is the vent suppose to be pvc 2" or metal 2 wall thru roof on fasco blower


This is an old one, I know they make 2" pvc, but I have never seen 2" Galv. Sheetmetal. I'm
guessing you have a High Eff. Furnace, therefore you would use pvc and be able to go
out the roof or out the sidewall

Sep 27, 2009 | Goodman Furnace Draft Inducer Blower ...

1 Answer

Heat not coming on carrier gas pack code 31


code 31 indicates pressure switch did not close or reopened during the heat cycle....1st thing to check is the inducer motor,,this is a small motor that turns a small blower wheel that draws the exhaust gases through the furnace and blows them into the vent pipe....1st locate the inducer assembly,,most easily identified by the small plastic fan blade that cools the inducer motor as it runs..1st turn off tstat and turn off furnace power switch..then turn on furnace switch,then set tstat to heat,set the temp above room temp by 5 degrees...remove the furnace front cover,locate the inducer motor,,if it isnt turning,but is warm or hot after a minute or so,likely the inducer motor is bad..if it isnt turning and isnt warm after 1 minute,then likely the main control board is bad,,not turning the inducer motor when it should,,,,,if the inducer motor is running,,then the pressure switch isnt closing,, could be a bad pressure switch but more likely there is a problem with the venting...some possible problems that would cause the pressure switch not to close in an 80% eff furnace [metal vent pipe] are: [1] a blockage in the vent pipe,base of chimney,dead bird at the furnace where vent connects to furnace or down inside the inducer assy,accessed by removing vent pipe from furnace....if all clear the chimney could be blocked up inside,,is the draft good when vent is removed from base of chimney?..if furnace is a 90%+ type [pvc plastic vent pipe],,then check the intake pipe at the furnace by removing it where it attaches to top of furnace..is the intake clogged with anything?..then check the intake and exhaust pipes outside for blockages,,including ice/frost/snow at the exhaust pipe outlet..

Jan 26, 2009 | Goodman GMS90703BXA Heater

1 Answer

My furnace is leaking water when the heat is running


You probably have a 90+% efficient furnace. They produce condensation. Does it have PVC vent pipes? If so there is a drain tube for condensation.

Jan 23, 2009 | Heating & Cooling

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