Poor Dehumidifying Performance; Rotor Is Stopped; Checking The Heater Elements - Dri-Eaz DRITEC 150 Owner's Manual

urement gives you a way of making a quick check of the
overall operation of the DriTec Desiccant.
2. Increased moisture load. If the unit is overloaded and
is trying to move too much moisture, the temperature at
the outlet will drop below the desired reading of about
30°F (17°C) higher than the temperature of the room
air. (Think of the excess moisture as cooling off the
stream of heated air). Is there some reason why the air
in the system has suddenly become much more humid?
The change could be overloading the DriTec Desiccant.
3. Check the heating elements. One of the heating ele-
ments may have stopped working. See "Checking the
Heating Elements."
4. Check the blower. A low outlet temperature can also
be caused by a problem with the blower. Turn off and
unplug the DriTec Desiccant and check to make sure
that the blower wheel can turn freely.

Poor Dehumidifying Performance

1. Check the air filter. If the filter is dirty, clean it as de-
scribed in the section titled "Cleaning the Air Filter."
2. Check inlet and outlets make sure that obstructions are
not blocking air flows.
Caution!
Excessive moisture buildup in the reactivation ducting could
cause blockage of the airflow.
3 . Has the moisture load increased? Has something
changed in the process space which could have in-
creased the moisture load on the unit? Check all open-
ings into the process space to be sure all doors and
windows are closed. Make sure that doors to the outside
are opened as infrequently as possible. Check for leaks
in the ductwork.
COPYRIGHT © 1999 2000 DRI EAZ PRODUCTS INC
4. Check temperature of reactivation air. It should be
about 30°F (17°C) higher than the temperature of the
room air. If it is not, see the section titled "Reactivation
Outlet Temperature is Too Low."
5. Check heating elements. One or more of the heating
elements may not be working. See the section on
"Checking the Heating Elements."
6. Rotor has stopped. The rotor may be stopped. See the
next section.

Rotor Is Stopped

1 . Problem with the drive. Remove the belt from the
drive rotor on the motor. Set the switch to the "On" po-
sition to turn on the unit. The drive motor should turn
slowly. For information on removing the motor, please
contact the Dri-Eaz Service Department at (360) 757-
7776.
Any troubleshooting procedure requiring that the unit be
plugged in to a power source while the cover is removed
should be done only by a qualified service technician
2. Check the seals. After long use, the seals may wear and
the rotor will not turn easily. Check the condition of the
seals. The surface of the seals should be smooth. If the
seals must be replaced, please contact the factory for in-
structions.

Checking the Heater Elements

1. The PTC heating elements are located behind the front
panel just below the process outlet.
2 . Turn off all power to the unit (see ELECTRICAL
DANGER note.) Unscrew the four fasteners holding on
the front panel and remove to expose the heater box.
3 . Disconnect the wire leads from the heater elements.
Check the resistance across each of the heating elements
using an Ohmmeter. If an open or shorted condition is
found, the element needs to be replaced. If you are not
certain if the element needs replacing, please contact the
Dri-Eaz Service Department for assistance in determin-
ing if the element needs replacing.
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Danger!