Just wondering if anyone has any suggestions on how to lower my furnace fan speed so it'll deliver approximately 525 - 550 CFM in cooling mode. I'd like to maximize the humidity/latent heat removal of my A/C system becuase here in Winnipeg, Manitoba, Canada the outdoor temps don't get that high but we have high humidity.
A/C - Ruud UAND018JAZ - 13 Seer - TXV - 18,000 BTU (requires 525 to 600 CFM)
Furnace - Ruud Super Quiet 80 UGPN07EAMER - current low speed approximately 700 CFM @ ESP .8 (derived from Magnehelic readings before blower and before coil and manufacturer’s blower data sheet)
Static Pressures - Duct System = .295 Filter = .225 Wet Coil = .280
I'm not concerned with lowering the ESP because I don't think the system is loud, in heating mode (medium high) it's within the temp rise specs and lowering the ESP would increase the CFM.
I would prefer to lower the cfm to 525 without using a rheostat (which appears to be common industry practice in my neck of the woods) and unfortunately replacing the blower with one for a UGPN05EAUER won't work because the CFM would be too low at 485 on low and too high at 770 CFM on medium low @ .8 ESP.