I have the opportunity to revise the sequence of operation for several air handling units. The units have cooling coils and reheat coils.
Cooling coil control valve will simply modulate to maintain 55F.
I am thinking of having the heating coil control valve modulate to maintain a discharge air temperature which varies between 55F and 100F depending on space temperature deviation from setpoint. For example, if space temp is 5F from setpoint, DAT = 100F. If ST = SP, DAT = 55F. And linear between.
Does this sound OK? Is a 5F deviation a good number?
Supply air temperature reset will also be incorporated. If return humidity is <55% and heating coil is energized, CC DAT increases by 1F every 5 minutes until HC closes or H>55%.