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-   -   AH - Fan Speed - How to determine (http://www.diychatroom.com/f17/ah-fan-speed-how-determine-37158/)

AndrewF 01-29-2009 07:32 PM

AH - Fan Speed - How to determine
 
Now that I have finished the upgrade of the main trunk lines in the basement, I am trying to figure out how to determine what the right fan speed would be for my AH.

It is a fixed speed unit, which means by moving the the wires I can change from slow/med/high.

It is a 5 ton comfortmaker AH matched with a 5 ton Heat Pump. What other info would one need to determine the optimum fan speed?

I have monitoring setup in that I can tell the suction line temp, the liquid line temp, the return (input) air temp and the supply air temp after going through the AH.

JohnH1 01-29-2009 07:52 PM

Do you have the Mfg specs on the AH and HP. A basic 5 ton a/c will need 2000 cfm. If you have the blower curve info on the AH you can check the static pressure then look at what blower spped you are at and cross to the CFM. The best CFM is whatever the MFG says it should be for your condenser AH match up.

JohnH1 01-29-2009 07:53 PM

Only after proper CFM is set up can the A/C be properly charged.

beenthere 01-29-2009 08:10 PM

Hmmmm.

Why was I thinking you had a Goodman.

hvaclover 01-29-2009 08:26 PM

Be nice to the DIYer Been.

hvaclover 01-29-2009 08:27 PM

Need to know the house sq ft first.

beenthere 01-29-2009 08:30 PM

I could have sworn he said he had a Goodman in another thread.

hvaclover 01-29-2009 08:34 PM

He did and they were mismatched off the website he bought them from.

AndrewF 01-29-2009 08:39 PM

Yes I have a Goodman. Fourth one in the family. (All working great.)
No I did not buy it online. I bought it from a local dealer.
The AH is a 5 ton 12 seer unit
The Goodman is a 5 ton seer unit.

Background info can be found in these posts.

http://www.diychatroom.com/f17/hvac-...16/#post203843

http://www.diychatroom.com/f17/hvac-...16/#post204283

http://www.diychatroom.com/f17/hvac-...16/#post206199

hvaclover 01-29-2009 08:39 PM

http://www.metacafe.com/watch/115041..._conditioning/

hvaclover 01-29-2009 08:43 PM

Quote:

Originally Posted by AndrewF (Post 221647)
Yes I have a Goodman. Fourth one in the family. (All working great.)
No I did not buy it online. I bought it from a local dealer.
The AH is a 5 ton 12 seer unit
The Goodman is a 5 ton seer unit.

Background info can be found in these posts.

http://www.diychatroom.com/f17/hvac-...16/#post203843

http://www.diychatroom.com/f17/hvac-...16/#post204283

http://www.diychatroom.com/f17/hvac-...16/#post206199


My bad.Sorry.

AndrewF 01-29-2009 08:45 PM

Quote:

Originally Posted by hvaclover (Post 221648)


Sure I can whip up one of those for each room. :)

Sometimes you do what you have to do to get cool air....dumping some ice in that cooler would give a nice boost too. :)

AndrewF 01-29-2009 08:46 PM

Quote:

Originally Posted by JohnH1 (Post 221622)
Only after proper CFM is set up can the A/C be properly charged.

That is where I was heading. From all the reading I have done, every HVAC guy I have had out has failed to do what I would think would be the proper way to measure the system.

So I am on a mission to figure it out myself so that it is done right.

hvaclover 01-29-2009 09:01 PM

Quote:

Originally Posted by AndrewF (Post 221653)
Sure I can whip up one of those for each room. :)

Sometimes you do what you have to do to get cool air....dumping some ice in that cooler would give a nice boost too. :)

:laughing:


:laughing::laughing::laughing: Your ok Andy.

beenthere 01-29-2009 09:56 PM

You'll find Comfortmaker uses a different CFM on their heat pumps then what Goodman does.

So, you can't actually ever have proper air flow for it.

ou can download the specs for your Goodman outdoor unit you have, and see if you can match its rated performance.
Goodman includes the temp rise it shold have. But, that swith its rated matched coil.


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