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Old 06-01-2009, 06:43 PM   #31
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Can I reduce my AC CFM/ton to under 300 to lower static pressure?


Yes.

Set it to a lower spped, check and record esp. Then if you still have another lower speed. Set it to that, take and record it.
Then look at chart for which one is acceptable.

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Old 06-01-2009, 07:36 PM   #32
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Can I reduce my AC CFM/ton to under 300 to lower static pressure?


ok new numbers. I am getting confused.
esp at
HI .90+.37=1.27
MED HI .80+.30=1.10
MED LO .45+.15=.60
LO .20+.05=.25

HI and MED HI are off the chart. My Chart only goes up to 1.0. Low at that ESP would be pushing 600 cfm, so i am guessing too low. Med LO at the esp would be pushing 760, a little low but very close. My next option at MED HI at that ESP with my guesstimate is about 700 CFM. So do i stick with the MED LO? ANy suggestions? There is no MED option. What are your thoughts? Thanks
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Old 06-01-2009, 09:08 PM   #33
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Can I reduce my AC CFM/ton to under 300 to lower static pressure?


I would stay with the med low, if your not having any humidity problems.

If you want your humidity lower then what med low is providing.
there is no harm from setting it to low, since its moving 700 CFM.
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Old 06-02-2009, 05:50 AM   #34
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Can I reduce my AC CFM/ton to under 300 to lower static pressure?


Quote:
Originally Posted by beenthere View Post
I would stay with the med low, if your not having any humidity problems.

If you want your humidity lower then what med low is providing.
there is no harm from setting it to low, since its moving 700 CFM.
I will be leaving it at MED LO, I havnt had any really hot weather yet. It has been a bit humid though, and the few times i have turned it on, it has removed about 10% humidity in an hour. As far as using the LO speed, it is only pushing 600 CFM, was that a typo on your part? I guess the true test will come wth some higher temps, and humidity. It has been quite cool here on Long Island.
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Old 06-02-2009, 06:02 AM   #35
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Can I reduce my AC CFM/ton to under 300 to lower static pressure?


I just misread your post, and thought it said 700 for low.
On med high, it would be moving closer to 950CFM in order to have that high of a ESP. When your med low ESP is .60" at 760CFM.

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