Munters DEW-300, Operating And Maintenance Manual

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5-3
7. There may be a problem with the thermistor which controls the solid state power
control (TSE1) See the section on “Checking the Thermistors.” There may also be
a problem with the power control itself (SSP1) Substitute a new part.
5.5 POOR DEHUMIDIFYING PERFORMANCE
1. Check the two intake filters, shown in Fig. 1-4. If these filters are dirty, clean them
as described in the section on “Cleaning the Air Filters.”
2. If you have installed bird screens on the intake and outlet for the reactivation air,
check these.
3. Has something changed in the process space which could increase the moisture
load on the unit? Check all openings into the process space to be sure all doors
and windows are closed. Check for leaks in the ductwork.
4. The volume of process air may be too great. You can reduce the volume of process
air by closing the process damper. (The control system will sense the changing con-
ditions in the stream of process air, and make adjustments to the temperature and
volume of the reactivation air.)
5. Check the air temperature at the outlet for the reactivation air. It should be 120°F,
±5°. If it is not, see the section on “Reactivation Outlet Temperature is Too Low.”
6. One or more of the heating elements may not be working. See the section on
“Checking the Heating Elements.”
7. If the process blower is overloaded, it will shut down automatically. This will prevent
the unit from drying the process air. The motor will restart automatically, once it has
cooled.
8. The HoneyCombe
®
wheel may be stopped. See the next section.
5.6 HONEYCOMBE
®
WHEEL IS STOPPED, RUNNING LIGHT IS ON
1. Check the wheel drive system. See Fig. 1-4. Pull back on the tensioner to loosen
the belt. Remove the belt from the drive wheel on the motor. Set the Manual/Off/
Auto switch to the Manual position to turn on the unit. The drive motor should turn
slowly. See section 5.10, Checking the Drive Motor, Wheel and Seals.
2. After long use, the lower seal may wear. The HoneyCombe
®
wheel will then ride on
the inner layer of the seal material. Since this is not as slippery as the outer layer,
the wheel will not turn easily. Check the condition of the lower seal. The surface of
the seal should be smooth. If the seal is very worn, you will be able to see some of
the inner layer of seal material. If the seal must be replaced, please contact the fac -
tory for instructions.