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Large Dehumidifying Dryers Operation 39
18. Turn selector switch to START position to start the dryer. The bed switch valve will
cycle to a known good position. The process & regen blowers will start. Process &
Regen heaters are enabled. A new regen heat/cool cycle is started. Blower alarms are
enabled 5 seconds after startup. Dew Point alarm is enabled 5 minutes after startup.
All other alarms are enabled with no delay.
19. Material Miser. When this feature is enabled, the panel light will illuminate and the
screen will display ‘ACTIVE’ when airflow is reduced to the drying hopper. When
airflow to the hopper is normal, the light is extinguished and the screen reads
“INACTIVE”.
20. Closed Loop Regeneration. When this feature is enabled, the screen will display
‘ACTIVE’ when regen airflow is in closed loop (cooling). When regen airflow is
normal, the screen reads “INACTIVE”.
21. The dryer is shut off by turning the control power switch to the OFF position.
5-3 Alarm Display Messages
Note: The relay screen which contains the Alarm Display Messages is
located inside the controller enclosure and may be seen through the
window on the front of the control box.
1. Non-critical alarms. The following alarms are con-critical and will NOT shut down the dryer:
a. Dew Point.
b. Process / Regen Dirty Filter.
c. Process heat low temp alarm.
d. Closed Loop Valve Motor fault.
2. Critical alarms. The following alarms are critical and WILL shut down the dryer. Alarms are silenced
by turning the Off/On/Start switch to the start position. The dryer will restart if the alarm condition is
no longer present.
a. Process blower fault.
b. Regen blower fault.
c. Process heater high temp switch.
d. Regen heater high temp switches.
e. Regen valve motor fault.
f. Process high temp alarm (TCU).
g. Regen high temp alarm (TCU).
h. Redundant safety alarm.
3. Viewing alarm codes. See Screen 6. The alarm screen is displayed any time an alarm is active, and
can also be accessed by pressing the right arrow key. Each alarm is assigned a 2 letter code as
follows:
ALARM CODES:
PB - PROCESS BLOWER
RB - REGEN BLOWER