AEC AP Series Large Dehumidifying Dryer - Manual (Page 48)

Large Dehumidifying Dryers Controls 47
Air Balance Enabled
Both Material Miser and Air Balance use the return air temperature and cannot both be
enabled at the same time.
Material Miser seeks to prevent over-drying of material while air balance seeks to maintain a
constant air flow through the drying hoppers.
Material Miser can be activated by either the proximity of the return air temperature to the
supply air temperature (Temperature Activated) or by the absence of a demand for material
(Convey Activated).
Material Miser, once activated, can either automatically change the supply air temperature set
point to a lower value (Set Back) or close an optional air damper valve (Air Damper) or both.
Air Balance requires the optional air damper valve to function. The air damper valve will
open and close depending on the difference between the return air temperature and the return
air temperature set point.
When Material Miser is “Temperature Activated,”
• Press “Set Back Temperature” to change the target value for the return air
temperature at which Material Miser is activated.
• Press “Set Back Delay” to change the time delay for activating Material Miser based
on the return air temperature.
• Press “Set Up Temperature” to change the target value for the return air temperature
at which Material Miser is de-activated.
When Material Miser is “Convey Activated,”
• Press “Demand Watchdog” to change the amount of time the drying hoppers demand
signal is off before Material Miser is activated. Once activated by this method, a
valid demand for material will disable Material Miser and return the drying hopper to
normal operation.
If Material Miser is using the “Set Back” function,
• Press “Set Back Setpoint” to change the value that will become the new process
supply air temperature set point when Material Miser is activated. The process
supply air temperature set point returns to the previous value when Material Miser is
de-activated.
When Air Balance is “Enabled,”
• Press “Return Air Temp. SP” to change the value of the return air temperature set
point. This value can also be changed on the drying hopper status display.