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Large Dehumidifying Dryers Functional Description 18
Process Air Dust Collector
The optional process air dust collector consists of a filter, dust can, pressure gauge, and
optional pressure switch (see Figure 5). The gauge will let you know whether it is time to
clean out your filters. The optional dirty filter alarm will be activated if the filter is dirty.
Figure 5: Process Air Dust Collector
PS
Differential
Pressure
Switch
Filter Check
Gage
E
F
Dust Level
Indicator
Slide Gate
Clamp
Dust Pan
Filter Retainer
Dust Shroud
Cartridge Filter
Thumb Screws
Material Overdrying Protection
Material Overdrying Protection is an automatic system used to reduce the chance of over-
drying, and possibly melting, the resin in the drying hopper. Material Overdrying Protection
activates when the return temperature is above a set value, indicating that all the resin in the
hopper is dry.
The control system monitors the return air temperature and automatically changes the process
air setpoint to the SET BACK SETPOINT value when the return air temperature rises above
the set back temperature. The process air setpoint returns to normal when the return air
temperature falls below the SETUP TEMPERATURE value. The target values for
changing the process air setpoint can be adjusted on the Mat Protect screen.
Recommended Temperature Settings
Drying Temperature (ºF) 160 180 200 220 240 260 280 300 320 340 360
Setpoint 120 125 130 135 135 140 150 160 170 180 200