Latest Discussions : Plumbing

ERSHMK

04:11AM | 07/24/07
Member Since: 07/23/07
1 lifetime posts
I WORK FOR A HVAC CONTRACTOR, AND WE INSTALLED A 90% (CONDENSING) GAS FURNACE IN AN UNCONDITIONED ATTIC. THE EXISTING 80% (NON-CONDENSING) FURNACE DRAINED OUT THE GABLE WALL. THE GABLE WALL IS NOT A SUITABLE PLACE FOR THE 90% TO DRAIN BECAUSE IT PRODUCES CONDENSATION YEAR ROUND AND IN THIS CLIMATE WILL FREEZE AND CAUSE ENDLESS HEADACHES FOR BOTH US AND THE CUSTOMER. WE LOCATED A CAST IRON VENT PIPE IN THE KNEE WALL WHICH WE COULD DRAIN TO IF WE CAN PENETRATE THE PIPE.THE SPACE IN WHICH THE PIPE IS LOCATED IS TOO SMALL TO CUT THE PIPE WITH THE NORMAL CAST CUTTING TOOLS. WE TALKED TO A PLUMBER, WHO TOLD US ABOUT A SADDLE WE COULD BUY AT A HARDWARE STORE THAT WOULD BOLT TO THE PIPE AND SEAL WITH A RUBBER GASKET,BUT WOULD INVOLVE CUTTING A HOLE IN THE PIPE WITH A DIE GRINDER. INITIALLY THIS SOUNDED LIKE A GOOD IDEA, BUT THE MORE WE THOUGHT ABOUT IT, THE MORE RESERVATIONS WE HAD ABOUT CREATING A POTENTIAL FIRE SITUATION IN A 100 YR OLD ATTIC SPACE. WE ARE OUT OF IDEAS SHORT OF ADMITTING OUR NEGLECT AND STUPIDITY TO OUR CUSTOMER AND REPLACING THE NEW 90% FURNACE WITH A NEW 80% FURNACE AND EATING THE COST. ANY IDEAS OR SUGGESTIONS WOULD BE GREATLY APPRECIATED.

THANKS, ERIC

MistressEll

08:09AM | 07/24/07
Member Since: 01/30/05
360 lifetime posts
You shouldn't be tapping into the primarly plumbing vent stack at all.

You are in the wrong forum, there is a well-moderated (the moderator often responds personally to posts) here - higher up on the list for HVAC.

Frankly, from your post you shouldn't be doing this work at all.

BV020497

03:25PM | 10/01/19
...and WHY, MistressEll, should we not be tapping into a primary drain vent stack? I'm looking to connect a drain line from a residential water softener. There is already an existing 11/2" sink drain plumbed into the vent line. (Nothing I did.) Tho a softener would kick out a lot more gpm than a furnace, during the softening cycle, a 3" vent line should be able to handle the flow without affecting the venting process to the outside home ambient as designed. What say, y'all, or anyone who wants to opine.


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