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Posted by Jean on February 20, 2009, 10:11 pm
On Fri, 20 Feb 2009 21:35:10 -0500, The King
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>snip
>>Here's where I got my formula:
>>http://www.ncweb.com/~jsbuilders/aruf-aepf%20install.pdf
>>INSTALLATION & OPERATING
>>INSTRUCTIONS FOR
>>ARUF, ARPF, ADPF, AEPF
>>SERIES AIR HANDLER
>>page 5
>> HEAT KIT NOMINAL kW
>>CFM 3 5 6 8 10 15 20 21
>>600 18 28 35 41
>>800 13 21 26 31 42
>>1000 11 17 21 25 34 50
>>1200 9 14 18 21 28 42 56 62
>> 230/1/60 Supply Voltage - Temperature Rise Table °F
>>Note: For installations not indicated above the following
>>formula is to be used:
>>TR = (kW x 3412) x (Voltage Correction) x 1.08 / CFM
>>Formulas can be rearranged to find different unknowns. If this one
>>cannot, then it has been "fudged".
>>As you can see, the above chart shows that temp rise of 21 corresponds
>>to 800 cfm. A temp rise of 19 would put it at approx 900 CFM. This is
>>in agreement with my calculations. In point of fact, I could have used
>>the chart alone to check airflow and not bothered with formula.
>Ok at a 21 DT with your numbers of 20a and 237v
>CFM = volts x amps x 3.412 / 1.08 x temperature rise. Do the math
>Your answer should be 735 CFM. If not you get another F.
>You are misinterpreting the information from Goodman.
How can I be misinterpreting their data if I have a TR of 21 and look
at their own chart and it shows 800 CFM for a 5 kW heater.
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>I'm honing my people skills so I can teach this shit and get out of
>the truck. How 'em I doin? :)
Improving. You just have to have more patience with the "great
unwashed"....
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>>Here's where I got my formula:
>>http://www.ncweb.com/~jsbuilders/aruf-aepf%20install.pdf
>>INSTALLATION & OPERATING
>>INSTRUCTIONS FOR
>>ARUF, ARPF, ADPF, AEPF
>>SERIES AIR HANDLER
>>page 5
>> HEAT KIT NOMINAL kW
>>CFM 3 5 6 8 10 15 20 21
>>600 18 28 35 41
>>800 13 21 26 31 42
>>1000 11 17 21 25 34 50
>>1200 9 14 18 21 28 42 56 62
>> 230/1/60 Supply Voltage - Temperature Rise Table °F
>>Note: For installations not indicated above the following
>>formula is to be used:
>>TR = (kW x 3412) x (Voltage Correction) x 1.08 / CFM
>>Formulas can be rearranged to find different unknowns. If this one
>>cannot, then it has been "fudged".
>>As you can see, the above chart shows that temp rise of 21 corresponds
>>to 800 cfm. A temp rise of 19 would put it at approx 900 CFM. This is
>>in agreement with my calculations. In point of fact, I could have used
>>the chart alone to check airflow and not bothered with formula.
>Ok at a 21 DT with your numbers of 20a and 237v
>CFM = volts x amps x 3.412 / 1.08 x temperature rise. Do the math
>Your answer should be 735 CFM. If not you get another F.
>You are misinterpreting the information from Goodman.