Question on Horizontal Mounting HE furnace

[jeffx]

When installing a High Efficiency furnace horizontally, is it better to have our installer put it on blocks or suspend it from the ceiling (old furnace is suspended from the ceiling).

Furnace has to be mounted horizontally because it is in a ~4' crawl space. What are the advantages/disadvantages to either?

Is there anything else special with the horizontal installation that I should make sure the installer does?

Unit is the TempStar IIS90, 100k BTU, horizontal mount AC coil, HEPA air filter, UV light and will be connected to a 3.5 ton AC unit in the summer.

[captube]

Suspend it.
Use sheetmetal supply, return and any transition that may be required.
Read up on uv light that will be installed and check to insure its placed as recommended.

[billva]

any chance of freezing temps in the crawl space?

what model HEPA filter did you get?

[t527ed]

how it is mounted is a matter of prefference, unit does not care. we usually mount on blocks with rubber pads so there is no chance of vibrating up thru joists. most important thing is that it is supported the length of unit so it does not sag. if they do hang it make sure doors are not blocked at all by hangers.

[mark beiser]

Unit is the TempStar IIS90, 100k BTU, horizontal mount AC coil, HEPA air filter, UV light and will be connected to a 3.5 ton AC unit in the summer.

Where do they plan on locating the UV light?

On the list of "most useless things to do for the average residential HVAC system", it is a very close call between duct cleaning and UV lights for the #1 most useless thing. This is largely because the vast majority of them get installed in locations in the system where they have no hope of ever doing anything beneficial for the system, or the air passing through it, much less living up to the claims of the IAQ pimps that manufacture and market them

UV lights have applications where it is useful for coil irradiation, mostly on heat pumps to stop dirty sock syndrome, but if it is installed anywhere else, it is nothing more than an expensive gizmo that is incapable of doing anything but damaging other system components.
A good media air cleaner and tight ducts after the air cleaner will keep the inside of the system as clean as the day it was installed, so an expensive UV light system would be a waste.

The whole UV light craze is nearly 100% marketing fluff to grab $$$ from uninformed customers. Sadly, many contractors continue selling and installing them them, mostly in useless locations. Many out of a lack of understanding of what the product really does because their only education on them is from manufacturers marketing materials and sales training, but many more out of greed because they just don't care, so long as they make $$$ off them.

If you look at ANY of the serious scientific studies that have been done on UVGI systems in HVAC, you will come to the realization that almost none of the systems on the market that are designed for residential HVAC have even the slightest hope of doing anything useful for treating the air flowing through the system.
There is a very very small minority of systems for residential applications that are capable of killing nasties in the air stream, but they are all very expensive systems that use 4 or more very high output bulbs, and are expensive to maintain.

Some of the newer PCO systems, that have UV lights as part of the proccess, look promising, but I'm still not fully convinced that they are worth the cost or maintenance, or what situations they are useful for.

[iwannahelp]

This is largely because the vast majority of them get installed in locations in the system where they have no hope of ever doing anything beneficial for the system, or the air passing through it, much less living up to the claims of the IAQ pimps that manufacture and market them

Pimps. That's funny. Does that make the installing contractor a ho?

[firecontrol]

Pimps. That's funny. Does that make the installing contractor a ho?

Will they be issuing Ho patches we can wear on our uniforms now?

[mark beiser]

Pimps. That's funny. Does that make the installing contractor a ho?

Only if the contractor doesn't realize how useless the product is because their only training on it is from the marketing and sales materials.

The ones that know about it, but continue selling them out of greed for the easy profit get different labels....

[jeffx]

Not at home right now, but it is a "FAST High Efficiency Air Filter".

Putting the UV light in the condensor box over the V coil, a single 18" light (not yet installed).

He did mount it on the floor on on blocks using the rubber noise dampening pads.

I'm suprised how quiet it runs.

No chance of the crawl space freezing, it's all insulated and on the same level as the lower level family room and laundry room.