5. Maintenance
5.1. Overview
This section includes suggested maintenance requirements for unit. This information is offered as a guide, but
your system may require more frequent maintenance. For example, if your unit is used in a very dusty
atmosphere, you should replace air filters more often. Use these suggested schedules as a starting point, and
modify them to suit your installation.
Munters dehumidifiers are designed to be very rugged and reliable. However, you should not skip maintenance.
Poor maintenance can result in poor performance, increased downtime and additional operating costs and
potentially void equipment warranty.
Munters strongly recommends that you follow a comprehensive maintenance program. This program should
include not only dehumidifier, but any support systems involved in the dehumidification system.
At some installations, downtime can be very expensive. To avoid possible downtime it is important to maintain
an on-site inventory of spare parts. A list of recommended spare parts is included in Appendix D.
As the unit operates, make routine checks of these three basic functions:
• The process air flow and reactivation air flow should be checked to ensure they remain at design levels.
If the air flow changes, this can change the operation of the unit. A change in air flow may call for
maintenance or troubleshooting. If the application changes, which will result in different air flows,
contact the Technical Service Department at Munters.
• Visually check and replace dirty filters as necessary.
• Check unit for alarms.
5.2. Quick Check
As the unit operates, make routine checks of these two basic functions:
• The supply air fan should be running whenever the HCU is getting power, the “MAX FLOW” or
“MAX DRY” switch is in the “On” position (HCU 4000, HCU 6000, and HCU 8000 only), and
the controller is calling for “FAN” to be on.
• Turn on power to the unit and allow it to operate normally for about 30 minutes. (This will allow
time for the temperatures inside the unit to stabilize.) You should run this test at a time of day
when the HCU needs to run dehumidification. Using a simple probe thermometer, check the
temperatures leaving (LAT) the cooling coil, desiccant wheel, and condenser coil. The cooling
coil LAT should be 15 to 30°F cooler than ambient. The wheel LAT should be 10 to 15°F
warmer than the coil LAT. The condenser coil LAT should be at least 112°F.
5.3. Recommended Maintenance Schedule
The following table lists recommended maintenance schedules. For detailed instructions on each procedure, see
sections that follow.
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