Daikin FWW02-20DA, Installation, Operation & Maintenance Manual, Page: 7 / 12

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For safety reasons, before carrying out any maintenance or cleaning operation, turn off the unit and cut the
voltage by turning the line switch to OFF.
Maintenance
The maintenance operations for the FWW air conditioner and hot-air heating units are limited to the periodic
cleaning of the air filter and the heat exchanger, and the checking of the working efficiency of the condensate
discharge.
Only skilled personnel may perform the maintenance.
Pay utmost attention during the maintenance operations: accidentally coming into contact with some of the
metallic parts might cause injuries, therefore use safety work gloves.
Every time the units are started after a long idle period, make sure that air is NOT present in the heat
exchanger.
The motor is maintenance-free since it is equipped with self lubricating bearings.
Cleaning the air filter
Cut voltage to the unit by turning the line switch to OFF.
For cleaning the air filter proceed as follows:
Access the equipment through the inspection panel and remove the air filter by unscrewing the fixing knobs.
Wash the filter with lukewarm water or, for dry powders, with compressed air.
Reassemble the filter after having it dried up.
Cleaning the heat exchanger
It is advisable to check the condition of the heat exchanger before the start of the summer season. Also
check if the fins are not clogged by impurities.
To access the heat exchanger, remove the drain pan and the drain guide. Upon having accessed the heat
exchanger, clean with compressed air or low pressure steam, without damaging the fins of the heat
exchanger.
Before operating it in the summer, check the condensate discharges regularly.
SERVICE AND MAINTENANCE