I have a Trane 3 ton AHU (TWE037E13FB) & 14i condensing/heat pump unit.
The unit appears to be working properly, but I would like to tailor some items to better suit my needs.
My question is that I would like to lower the fan speed during heating & would like some opinions on the best/proper methods.
At first I tried to set the cfm/ton settings, but seems that this is for cooling only.
The unit is flowing a considerable amount of air to the point of feeling drafts & consequently more noise than I would like. My old 2 ton GE unit was having a hard time keeping up on cold days & only flowed air similar to the 50% setting I have now. I understand that the aux electric heat (BAYHTR1415BRKB needs 1300 cfm, but during heatpump only mode can this be safely reduced & how? If aux heat is needed, I can live with the increased noise, but during moderate conditions I do not feel I need the full airflow heat mode.
For instance, if it is 40deg out, then I want lower flow & longer run time to get a more stable temp rise & when it is in the 20s with the aux reheat running, Ill accept the increased flow to match.
I am using the Enhanced mode programmed in the AHU & wonder if I should switch to using the variable speed settings in the stat (XR402). BK mode is currently disabled. This would also allow me to adjust the minimum fan speed which I would like to be slightly less than 50% as well.
My main questions are:
Can the AHU be wired to think it is in cooling mode to allow the reduced setting of the AHU or through the stat?
How should this be done?
Will the speed still switch to high when the aux heat kicks in if I lower the heating airflow?
Any help or additional advice is greatly appreciated.