Light Commercial R410A on-off    DM17-01.01.08en 
    133 
3.  Indoor unit installation 
3.1 Compact cassette indoor unit installation 
3.1.1  Service space for indoor unit 
 
 
3.1.2  Bolt pitch 
 
 
3.1.3  Install the pendant bolt 
Select the position of installation hooks according to the hook holes positions showed in upper picture. 
Drill  four  holes  of  Ø12mm,  45~50mm  deep  at  the  selected  positions  on  the  ceiling.  Then  embed  the 
expansible hooks (fittings).