wrote:
On Tue, 14 Oct 2003 13:31:18 -0500, Darrell
wrote:

Using Performance Data Spec Sheets to figure - Condenser Temp-Split

Testing whether the A-C System is delivering the Manufacture's BTUH
Rating by checking the Condenser's Delta-T

temp-split. I question whether tech's can get them set-up well enough
to get the rated SEER.

So do I, and when you're not getting the right temp split indoors and
outside at the condenser, you know you have some problems. Of course,
you check the condenser coil, I lit a lot of the inspections that have
to be done in my A/C pages, but am not going to go through them here!
Any good tech knows them, and must know the proper sequence to apply
them or will they not solve a lot of the problems. (Darrell)

http://www.udarrell.com/air-conditio...city-seer.html


The compressor's Service Factor will handle the electrical load
as long as the "discharge line gas temp" doesn't get above 225-F.

clipped to save space

No where, not even once, do you mention quantifying the amount
of air flowing over the condensor. Forget about actually measuring
it, to ascertain coil blockage and fan performance, you don't even
mention taking the nominal 'if everything were perfect' factory
numbers.

Without knowing mass flow, the delta-T tells you exactly
nothing about heat transfer.

How the hell could you *ever* have been in the industry and
not know that ?

Without this, you entire post is complete and utter bull****.

This doesn't even begin to address the other problems with it.

Well, you're condemning me for not knowing something I do know! Anyone
knows that you have to know those things before you can figure anything.
There are no major problems with the method, because the one thing every
tech needs to know is how many BTUH in sensible and latent heat the unit
is putting out. I used a sling psychrometer to get the wet bulb temp.

CONDENSER TEMP-SPLITS - Comfortmaker® 12-SEER units
1.5Ton 18,400 16.4 Temp-Split Cond. CFM 1400 WATTS 1415
2 Ton 24,800 23 Temp- Cond. CFM 1400 WATTS 2067
2.5Ton 30,200 19-F Temp-S Cond. CFM 2000 WATTS 2359
3 Ton 35,600 16-F Temp-S Cond. CFM 2800 WATTS 2738
3.5T 42,500 18-F Temp-S Cond. CFM 2800 WATTS 3542
4Ton 48,500 18-F Temp-S Cond. CFM 3400 WATTS 2359
5Ton 59,000 22-F Temp Cond. CFM 2000 WATTS 3731

CONDENSER TEMP-SPLITS - Comfortmaker® 10-SEER units factor
1.5Ton 18,500 17 Temp-Split Cond. CFM 1400 WATTS 1516
2 Ton 24,600 23-F Temp-S Cond. CFM 1400 WATTS 2050
2.5Ton 30,200 20-F Temp-S Cond. CFM 2000 WATTS 2727
3 Ton 35,600 24-F Temp-S Cond. CFM 2000 WATTS 3025
3.5T 42,500 28-F Temp-S Cond. CFM 2000 WATTS 3664
4Ton 48,500 21-F Temp-S Cond. CFM 3000 WATTS 4241
5Ton 59,000 27-F Temp-S Cond. CFM 3000 WATTS 5455

The condenser fan speeds are slower on several of the 10-SEER Tonnage
Models. I didn't divide by the 1.05 altitude correction factor. We are
only trying to get an idea of a target value to compare to.

By using the various units' "base specification sheet data" from the
dealer, you can determine if it is operating near its BTUH capacity rating.


You're supposed to get and use the company's specifications sheets, I
have them and could have listed all the condenser CFM's of all the
condenser's listed. (Darrell)

" I didn't use a 1.05 altitude correction factor.


Oh, very very good. Now you're going to re-invent formulas
that have been industry standard for decades, based in solid
analytical science ??

I suggest you purchase a copy of my Palm pilot program to see
exactly what happens to that correction factor at various altitudes.

I stated the fact so anyone could use it if they wanted too.


Are you sure you're 'retired', or were you perhaps chased out
of the industry ????


Believe me no one chased me out of the industry, my mother passed away
and I came nearly a 1000 miles back home. Got injured several times,
then my father passed away and I never returned to my business again in
another state. I'm nearly 70 and due to a lot of problems may not even
be able to go deer hunting this year, but I'm going to try to.

I assure you that the easy method I'm offering, used in proper sequence
with all the other checks and tests will make trouble shooting more
effective in getting all the BTUH that is possible out of a system.

There are countless units that are not delivering anywhere near there
capacity ratings within the conditions they are operating.

Trying to discredit me is not going to be helpful to the industry or to
all the users' out there that are wasting energy, money, and are getting
sub par performance from their A/C systems.

You don't see me trying to discredit anyone. (Darrell)


Paul ( pjm @ pobox . com ) - remove spaces to email me

New HVAC/R program for Palm PDA's !! http://pmilligan.net/palm/
Free demo now available online !!!!

I'm not going to say a negative word about what you you just wrote. Calm
down and keep an open mind, then give what I've offered a thorough test.


All I was interested in was providing the condenser temp/split that a
tech ought to strive to achieve, and the figures he could use to compare
the BTUH of heat the unit is delivering.

It is a measurement of the amount of latent and sensible heat the
evaporator coil is observing and transferring. There is no legitimate
reason for you to scream that I am some kind of half-wit lunatic.

I'll use that method at the head of my list of diagnostics and I'll know
immediately if it is delivering the BTUH and SEER I want it to deliver
at the normal operating conditions of the customer. Of course, i will
use all the other diagnostic charts and methods that are being used by
the most competent techs.

I used the additive before I read your post and added a 10 SEER Chart.
Any contractor or tech can get that performance data from a dealer. I
also added the CFM and the WATTS on the company's performance data
specification sheets. Darrell - udarrell

http://www.udarrell.com/air-conditio...city-seer.html

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