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Originally Posted by hearthman

Actually John, most "sealed" combustion units are NOT sealed. Leaky returns can and do pulled combustion gases out of CAT IV furnaces all the time.

The code is also addressing CAZ depressurization if there are other atmospherically vented appliances.

However, since ya'll seem to think this is BS, you can contact the IRC and tell them why they should rescind N1103.2.2, M1601.4.1, & M1602.2 for starters.

Then again, you always have *Best Practices* that call for sealed ducts to balance the system.

I agree, it would be great if we could seal all of them.

You could come ride with me for a year Hearthman, and I guarantee out of all the service calls we would do in a year we would see less than 10 systems with sealed and insulated ductwork and 9 of those would be attics or crawls. I am not disagreeing with you that it should be done.

I'm starting to see sealed ductwork on more and more new construction jobs but still not both sealed and insulated.

A draft interference test should be part of every tuneup where there are atmospheric burners to ensure sufficient combustion air.

Originally Posted by JKopp

Like a sealed combustion furnace is going to expel any products of combustion.

Actually John, most "sealed" combustion units are NOT sealed. Leaky returns can and do pulled combustion gases out of CAT IV furnaces all the time.

The code is also addressing CAZ depressurization if there are other atmospherically vented appliances.

However, since ya'll seem to think this is BS, you can contact the IRC and tell them why they should rescind N1103.2.2, M1601.4.1, & M1602.2 for starters.

Then again, you always have *Best Practices* that call for sealed ducts to balance the system.

Originally Posted by hearthman

Conditioned space or not the SA plenum should be insulated to R-6/ R-8 in unconditioned spaces and the ducts should be sealed. The returns MUST be sealed per IRC for first 10ft. for combustion safety and new work should have a duct blaster test done. It also improves performance and is probably the single best thing you can do for any forced air system regardless whether a code officials *requires* it or not.

Hey, you asked for nit picking! BTW, rest looks very nicely done.

i DID ask for nit picking, you're correct haha. thanks for the compliments.

interesting you bring all that up too. i agree that it definitely won't hurt my cause but i'm quite curious how much i would actually benefit from having my ducts sealed. beyond the fact that i have supply registers in the basement too.

Originally Posted by JKopp

Like a sealed combustion furnace is going to expel any products of combustion.

i agree with that, but i'd be more concerned with other things like my standing pilot water heater that's right next to the furnace. it's not like water heaters and other appliances are always right next to the furnace though either.

Originally Posted by hearthman

The returns MUST be sealed per IRC for first 10ft. for combustion safety

Like a sealed combustion furnace is going to expel any products of combustion.

Conditioned space or not the SA plenum should be insulated to R-6/ R-8 in unconditioned spaces and the ducts should be sealed. The returns MUST be sealed per IRC for first 10ft. for combustion safety and new work should have a duct blaster test done. It also improves performance and is probably the single best thing you can do for any forced air system regardless whether a code officials *requires* it or not.

Hey, you asked for nit picking! BTW, rest looks very nicely done.

Originally Posted by hearthman

Is your supply duct internally insulated to R-6? Also, I do not see any duct sealing.

no, no insulation. this is a full basement/conditioned space.

no sealing duct is quite tight, but again... this is a conditioned space.

ducts

Is your supply duct internally insulated to R-6? Also, I do not see any duct sealing.

Originally Posted by Southern Mech

Pretty work

don't forget your drainline on the coil

and I don't like your O.D. Unit stand, I like to build them on a pressure treated deck platform then put snow legs on if needed.


But very nice work

Originally Posted by furnacedoc

No company installation sticker? Where are all the manuals? I would have waited for the solar ready to come out. What temperature do you have your discharge air set to in heat pump mode?

i ran out of "cody's heating and air conditioning" stickers! the manuals are all in a nice expandable folder sitting on top of the return trunk. like you said already, it is solar ready. i don't know if you can do fixed DAT in hp mode, but i for sure know it's possible in gas heat.

btw, smartass.... haha

dam it it is solar ready

No company installation sticker? Where are all the manuals? I would have waited for the solar ready to come out. What temperature do you have your discharge air set to in heat pump mode?

Originally Posted by cody350

hey evan, i see charles told you where to find me! haha

Haha yep! I enjoyed your class, hope to see you again next year.

Originally Posted by chuckcrj

Very nice install Cody!

thanks charles

Originally Posted by knave

Very professional install, on some very nice equipment. I like the look of the one piece door.

Another plus with the SLP's is you can get by with lower CFM for gas heat with the larger temp. rise. = QUIET

hey evan, i see charles told you where to find me! haha

thanks for the comments

Originally Posted by jricer2001

looks like a professional job. hope it runs as good as it looks

thanks, it runs GREAT! i just got a chance to check charge in cooling. running dead on at 6 degrees subcooling.

looks like a professional job. hope it runs as good as it looks

Very professional install, on some very nice equipment. I like the look of the one piece door.

Another plus with the SLP's is you can get by with lower CFM for gas heat with the larger temp. rise. = QUIET

Very nice install Cody!

JCT- i am most likely going to be doing some zoning in the future and i will do some before and after statics try a little different stuff on the duct.

thanks for the comments

A few things on the duct, the supply takeoffs on the plenum shoud be transitioned not straight that is horrible for airflow and the RA elbow at the furnace? radius heel sq. throat could have done sq heel and it would have been the same. Tip for future installs, radius heel and thoat or square with turning vanes.

thanks for all the comments

HPpro- while installing it like i did i checked with a level on the drain pan and still have some pitch to the drain. you can actually bend up the tabs on the cased coil where the pan sits to get you more pitch. sadly, i've had the a/c on already once and it drained just fine.

on a different note, the one time i used the a/c so far this spring i used the dehumidify feature on the icomfort. WOW, i had a 30 degree temp drop and it was POURING out condensate.... not to mention all my supply duct in the basement was sweating like crazy.

Good looking work, do you have any problems with the a/c draining with the furnace pitched forward like it should be and the evaporator coil facing back?