2-ton coil hooked to a 2.5 ton condensing unit

[splus]

i must say i never have run into this before,2-ton slab coil connected to a furnace in an attic and it was connected to a 2.5 ton outdoor unit system is 3 years old and i did check the number of the coil and it was a 2 ton for sure.subcooling was 12 and superheat was 8 as this was a txc system with a small load on it i assumme the mismatch is what makes the superheat.airflow was more than adequate i just need to know if this was a install mistake or don on purpose to get more capacity out of the coil.

[BaldLoonie]

Probably would work if straight cool. Trane usually rated units with coils slightly smaller, occasionally an air handler. Usually reduced SENSIBLE capacity which increased the sensible heat ratio meaning a hair more run and a hair more dehumidification.

[splus]

not sure if this means anything o blad on but the outdoor unit was a nordyne microchannel unit thats how i got called for a clean and tune,it was an aspen slab coil and had a 2 ton txv valve and with the readings i got i also had a 21 degree temp drop across the coil i really think this is what the install company planned on doing and this was not a mishap