"HvacTech2" wrote in message
...


Hi PrecisionMachinisT, hope you are having a nice day

On 30-Jan-05 At About 09:13:24, PrecisionMachinisT wrote to
PrecisionMachinisT
Subject: Defrosting heat pumps

P From: "PrecisionMachinisT"


P Generally around here it's simply caused from a change in the weather
P and having the timer set for too long of a time span--your other
P choice being frequent defrosts taking place when there isnt even
P any frost formed on the coils...basically a nuisance situation where
P your damned if you do and your damned if you dont, too...

This sounds like a case for demand defrost. demand defrost which trane
uses
self adjusts due to the fact that it senses the temp difference between
the
air in and out of the coil and goes into defrost when the delta T is about
25 degrees. of course you don't want to go changing them all now but it is
something to consider when you need to change one down the road.


Yeah, not worth the effort on a 15 year old unit...

Matter of fact I have been looking into replacing that Lennox condensor with
maybe a new Trane unit--but as of yet I havent found complete specifications
published on the web....for me this is a *must have* in order to make any
informed decisions, also I really dont wanna replace the air handler even
though the evap coils at a minimum should be removed for a thorough cleaning
soon.

Then again, if it works, don't mess with it.........in reality, the biggest
issue is that the ductwork installer hired by the previous owner was a hack,
and the ducting has mostly been covered over.......and with the house being
just shy of 7500sf fixing this becomes a *major* renovation......

--

SVL