If installed in an appropriate environment, the drive requires very little maintenance. This table lists the routine maintenance intervals recommended by Daikin.
Frame Sizes R7 and R8
Refer to the installation instructions supplied with the fan kit. Enclosure fan replacement – UL Type 12 enclosures UL type 12 enclosures include an additional fan (or fans) to move air through the enclosure.
Source: Daikin (oslo.daikinapplied.com)