-
Originally Posted by
4inchCrescent
Thats an accident waiting to happen
-
It already happened...
Originally Posted by
tatortott
Thats an accident waiting to happen
It's not what you're capable of doing that defines you, it's what you do on a daily basis.
-
There 'is' barely enough room for a skinny tall gas water heater in that corner... stuff job, and definitely not code.
Question for you tankless guys:
I saw a double tankless (paired, with the linking cable) installed in a clean, large crawl a while back (just guessing... the crawl was probably in excess of 2000 sq/ft floor, and I could walk in it)...
Flue pipes were done quite well... however the installer did not do combustion air pipes. The combustion side had about 5 ft of pipe each. Note there was more than adequate combustion air in the crawl...
My question: specifically (asking for technical reasons) Why do the tankless folk want combustion air piped from outside???
Just curious...
THX
GA
GA-HVAC-Tech
Your comfort, Your way, Everyday!
-
The intake and outlet venting for a tankless heater must come from an area of always-the-same pressure. The reason is that, if they don't, any low pressure inside the space can draw in cold outside air, through the tankless, while the tankless is off - and freeze the heat exchanger.
So long as both intake and exhaust are in a place of equal pressure (relative to each other) no off-cycle air flow can be induced through the tankless.
PHM
--------
The conventional view serves to protect us from the painful job of thinking.
-
Post Likes - 1 Likes, 0 Dislikes
-
Originally Posted by
Poodle Head Mikey
The intake and outlet venting for a tankless heater must come from an area of always-the-same pressure. The reason is that, if they don't, any low pressure inside the space can draw in cold outside air, through the tankless, while the tankless is off - and freeze the heat exchanger.
So long as both intake and exhaust are in a place of equal pressure (relative to each other) no off-cycle air flow can be induced through the tankless.
That's a very good point and something I would have never thought of. Thanks for pointing this out. 
-
You don't get paid for the hour. You get paid for the value you bring to the hour. Jim Rohn
-
Originally Posted by
Poodle Head Mikey
The intake and outlet venting for a tankless heater must come from an area of always-the-same pressure. The reason is that, if they don't, any low pressure inside the space can draw in cold outside air, through the tankless, while the tankless is off - and freeze the heat exchanger.
So long as both intake and exhaust are in a place of equal pressure (relative to each other) no off-cycle air flow can be induced through the tankless.
Originally Posted by
ammoniadog
That's a very good point and something I would have never thought of. Thanks for pointing this out.
THX PHM... I would never have thought of that either... however it makes good sense!
GA-HVAC-Tech
Your comfort, Your way, Everyday!
-
Uhm ? Ifgc chapter 3 not a quote . Dont take combustion air from a bathroom . Is this a confined space as far as combustion is concerned.lol
-
I mean yeah you notice it, but only because you know its there.
-
The poop fumes gives the combustion an extra boost.
Like nitrous in a car.
-
Originally Posted by
kdean1
I am especially fond of the positive pressure PVC exhaust connected to the single wall vent with foil tape. Someone was probably very proud of their ingenuity.
Painted the metal 90..now that is craftsmanship
Sent from my iPhone using Tapatalk
-
Intake and exhaust in same pressure zone to minimize nuisance trips of the pressure switches as well. (wind)
Reply With Quote
Subscribe to this feed
The place where Electrical professionals meet.
