With an IAQ set up to control the blower.
Your contractor should have selected B.
I am wondering what the ideal blower fan ramping profile is for my Goodman GMV95090 furnace when in cooling mode with my 2.5 ton a/c. I have the Honeywell IAQ thermostat connected with the dehumidify on demand feature enabled so I am not sure if using a ramping profile that is meant to increase dehumidification is a good choice or not.
Here are the 4 ramping profiles:
A: 100% CFM during cooling followed by a 1 minute off delay at 100% CFM after the compressor shuts down.
B: 50% CFM for first ½ minute of cooling followed by 100% CFM for remainder of cooling and a 1 minute off delay at 100% CFM.
C: 82% CFM for first 7.5 minutes of cooling followed by 100% CFM for remainder of cooling and a 1 minute off delay at 100% CFM.
D: 50% CFM for first ½ minute of cooling followed by 82% CFM for the next 7.5 minutes of cooling followed by 100% CFM for remainder of cooling and a 1/2 minute off delay at 50% CFM.
If I didn’t have a stat with the dehumidification feature I would lean towards profile D, but I’m not sure if that would be counter productive in my case since the stat should take care of dehumidifing when required.
With an IAQ set up to control the blower.
Your contractor should have selected B.
It was left at the default (A). I will mention it when they come back for another issue.
What is the advantage of running the fan at 50% for the first 1/2 minute?
A wouldn't bother me. B is nice because it gets the coil cold fast for more moisture suckin' ability. I don't like C or D with dehumidify on demand.
Thanks guys.