Munters DEW-150, Operating And Maintenance Manual

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4–1
4 – PREVENTIVE MAINTENANCE
The HC-150 unit requires very little regular maintenance. Check these points every 30 days:
4.1 CLEAN THE AIR FILTERS
1. The HC-150 unit includes two air filters. These are shown in Fig. 1–4. Each filter is
made of expanded aluminum, mounted in a metal frame.
2. Switch the unit off and wait for the blowers to stop turning. Open the front access
panel. The process filter is located in the lower left hand corner of the unit.
3. The reactivation filter is mounted on the right end of the unit. See Fig. 1–4. Undo
the 2 thumbscrews on the bottom of the case. Using the tab, pull the bottom of the
filter outward, then down.
4. If necessary, clean each filter in warm soapy water. Allow each filter to air-dry, or
use compressed air. Once the filters are dry, reinstall them by reversing Steps 2
and 3 above.
4.2 CHECK THE HONEYCOMBE
®
WHEEL
Check the Honeycombe ® wheel to be sure it is rotating correctly. Look for signs of
discoloration caused by dirt, dust, or other foreign materials. In order to clean the wheel
and inspect the seal, you must remove the drive motor and wheel. See the instructions in
section 5.10, Checking the Drive Motor, Wheel and Seals.
4.3 CHECK THE UPPER AND LOWER AIR SEALS
The HoneyCombe
®
wheel rides on the lower air seal. Make a quick check of this seal.
Be sure the outer surface of the seal is smooth. If the seal is very worn, the outer layer
will wear through. If the seal must be replaced, please contact the factory.
4.4 CHECK THE REACTIVATION OUTLET TEMPERATURE
After the unit has been operating for 30 minutes, the temperature at the outlet of the
reactivation air stream should be about 120
°
F. Check this outlet temperature with a
thermometer. It should be within
±
5
°
F. If the outlet temperature falls outside this range,
see Section 5 – Troubleshooting.