furnace to large.

[hemitom]

Hi all, read a post here a few days ago about a furnace being to large. One of the replies was to partially close the gas supply valve. What would be the consequences of doing this.Harm the heat exchanger? gas valve ?etc.

[york_hvac]

Gas valve is NOT to be partilly closed to regulate heat strength. It is designed to be either fully opened or fully closed.

[pecmsg]

BOOM

Please don’t mess with the gas valve, Shut off valve or the system in general. No one here can see your unit. IT MUST BE LOOKED AT BY A HEATING CONTRACTOR AT YOUR HOME.

[Wild Leg]

Originally posted by hemitom
Hi all, read a post here a few days ago about a furnace being to large. One of the replies was to partially close the gas supply valve. What would be the consequences of doing this.Harm the heat exchanger? gas valve ?etc.

Don't do it.

Who told you the furnace is too large?

[hemitom]

Its not my furnace just a post i read here, no one really gave a response to the question in the post. Jultza, or any other hvac pro,why don't you explain why this is so dangerous so people won't try it. this is the response i was looking for (a warning to others as to why not to do this) thank you.

[Edited by hemitom on 10-18-2005 at 08:13 PM]

[Jultzya]

And this is the EXACT reason THAT post should have been DELETED!

Now, along with this one.... SOMEONE is going to TRY IT!

[contactor]

lowers design gas pressure to manifold which may cause flashbacks into burners and delayed ignition (fires and explosions)and,raises carbon monoxide levels and can prevent proper venting of flue gas (sickness or death).
two reasons I can think of not to do that.
Fix the problem correctly.If you dont know how, get someone that does. Thats a big no-no in our trade.

[hemitom]

Thanks contactor, this is a response that should have been give to the original post . this is something that will make a home - owner, renter, or whoever not try this. not a reply like boom! or blow up your house etc. a straight forward common sense reply thanks again.