orifice size

[melo]

I am replacing an existing 5 ton a/c system with a Trane 5 ton condenser and Armstrong 5 ton evaporator coil. the Trane specs list an orifice of .095. The evaporator coil specs list a .099 orifice. Is this an acceptable match or do I need to replace one and if so which do I change?
Thanks.

[newoldtech]

You always go by the outdoor units requirements. As long as you know your dealing with a matched system.

[melo]

Thanks for the quick reply... so to confirm, is the difference between the .095 and .099 enough to warrant changing the inside orifice to a .095 to match the outside unit?

[billva]

it will not matter. why the strange combo?

[melo]

I guess I can leave them alone - thanks.
reason is that I had to locate a 5 ton coil that would match the space requirements of the existing coil. The Armstrong was a good match for my existing Lennox coil (maybe because the Armstrong is a Lennox?). I also happened to come across the Trane condenser unit from a builder friend.....The two appear to be a good match seer and tonnage. But I noticed the slight discrepency in the orifice size.
Thanks!

[billva]

there is no seer rating on that combo. so as far as you know, you may have an 8 seer.

[melo]

BillVA,
so even though both have a seer of 13 the combo doesn't necessarily maintain that seer?

[billva]

umm............

no.

[melo]

what other specs should I be comparing to determine if this is a good match?

[billva]

but the good news is, since it has never been tested, it may be a 19 seer. maybe you are on to something.

[billva]

http://www.aridirectory.org/index.html

[melo]

doubtful....but I will be happy if it works and is reasonably efficient...I will probably never know what the efficiency is. are there any other specs I should be checking to make sure they are a decent match?

[vlux]

none of my business but orifice size is critical, like newoldtech said go with spec on outside unit, .095-.099 are differant will it be ok to use .099? Also dont understand your fits better problem, dont you get the best combo and do the plenum or ahu to match, sounds like you may not be taking the easy way if you end up with orifice problems jmo

[billva]

Originally posted by melo
doubtful....but I will be happy if it works and is reasonably efficient...I will probably never know what the efficiency is. are there any other specs I should be checking to make sure they are a decent match?

nope. will not matter.

[mark beiser]

Go with the #95 piston the outdoor unit shows.

Better yet, go with a TXV...