WEGER WALTER GMBH DIWER EVO DP80 Series, Installation And Operating Manual

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Installation and Operating Manual Page
50
Printed: 02/2015
Water, water-glycol mixture, steam
Apart from regular cleaning, heat exchangers require no maintenance. Check the heat
exchanger every 3 to 4 months for dust deposits and clean it, if necessary.
For prolonged shutdown, empty the exchangers. After (re)filling, always bleed the heat
exchangers.
Cleaning
If there is a lot of dust, clean the heat exchanger from the dust air side with a vacuum cleaner.
If this is not sufficient to remove the dust deposits, pull out the heat exchanger to clean it with
water. If the exchanger fins are made from aluminium or copper, do not clean them with a
water jet.
Galvanized steel batteries may be cleaned with a steam jet cleaner. If necessary, use a soft
brush. Take great care to prevent damage to the fins.
Remove any corrosion visible on the heat exchanger (derusting, sanding) and cover the
affected areas with zinc paint.
General maintenance
Demister
Check the demister fins at least once a year for dirt. If they are dirty, remove the demister
from the unit and clean it. Reinstall it in the correct position.
The siphon must be designed with reference to the actual static pressure and so that it
prevents drying out (Refer to 6.4. for details). Never connect the siphon directly to the waste
water system.
Condensate tray
Regularly check the tray, drain and siphon for dirt and clean them, if necessary.
Frost protection
Prior to the start of the cold season, test the frost protection system.
Electric air heater
Check the heater for dirt and clean it, if required. Check the power connections and test the
thermostats.
To prevent overheating of the components, set the fanrun-on time to minimum 3 to 5
minutes.