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The unit continues to run for a few minutes after the Auto/Off/Manual switch is turned off.
This “cool-down” cycle helps to protect the heating elements from overheating. During
the cycle, the wheel continues to turn, and the reactivation blower continues to operate.
The cool-down period is controlled by a thermostat switch (TS02).
On the HC-150R only, a temperature control switch (TS04) is included. This shuts the
heater off when the wheel is fully reactivated.
1.4 PROTECTIVE CIRCUITS
The HC-150 has several sensors and circuits which protect the machine and operator
from possible problems. A temperature high limit switch (TS01) is located between the
heater and the wheel. This sensor will tell the control circuits if the elements overheat
(temp. above 320°F). If this happens, the Fault indicator will light and the machine will
stop. To reset the machine, wait until the unit cools to normal temperature. Turn the
Auto/Off/Manual switch off, then on again.
The wiring for each heating element includes a fusible link. This link will open if the
element overheats. If this happens, the HC-150 will continue to operate, but will not
dehumidify the process air. To correct this, find the cause of the overheat condition and
replace the fusible link.
On the HC-150I only, an overheat anticipator (TS03) is included. This slows the response
of the heater circuit to reduce nuisance overheating faults.
If a blower motor is jammed, it will start to draw a large amount of electrical current. If
one of the motors detects this condition, that motor will shut itself down. The rest of the
unit will continue to operate, unless an overheat fault is triggered. The affected motor will
reset itself automatically.
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