Great post, Turtle! This reinforces my theory that temp difference
can vary greatly. If the house is really hot when you turn the system
on, the evap is going to cool down relatively quick compared to the
house's ambiant temp. So to check delta a couple minutes after firing
up the A/C on a really hot day would probably yield some gawdy
number...
Thanks for the time and help, everybody!! (except alt.hvac
specifically -- try ignoring a post if you don't want to answer it --
it works better for everyone! That's why I wrote 'crosspost' in the
subject)


"TURTLE" wrote in message ...

This is Turtle.

1) Checking the T.D. / Delta-T is not a very good test of the proformance of a
system for on high humitity day it will make the TD number look very poor and on
a dry day make the numbers look very good and it being the same system but at
different times. With the TD you can make a system look anyway you want it by
picking the time and days you want to check it. It sucks to check a system this
way.

2) Call all of them over to see the results of the TD but let the house get up
to about 95ºF or more in the house and then turn it on and you will have a 30ºF
to 35ºF [ TD ] . You can make the number what you want when choosing the time to
check it.

3) If you have a 58ºf discharge temperature and about 70ºf to 75ºf indoor
temperature. a TD of 10ºF or 15ºF can be just fine.

4) one for a thought. Take a brand new tune to perfection 14 seer hvac system
flower rater type and not expanion valve type evaperator coil and turn it on in
outdoor temperature of 50ºF and you will be luck as hell to get a 7 to 10ºF TD.
You need a low ambiant controller to get it to work in 50ºF or less outdoor
temperatures.

5) If your agent is going to use the TD to see if the system is working
properly you don't need a hvac professional at all and just get the yard boy to
check and turn up your system.

6) Using TD for a standard good test of a system is really just a joke talk
about.

TURTLE


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.732 / Virus Database: 486 - Release Date: 7/29/2004