Homematic IP Compact Plus Mounting Instruction And Operating Manual page 50

Start-up
Danfoss RA
Danfoss valve bodies have elongated notches around their circumfer-
ence, which also ensure that the adapter is properly seated when it snaps
on.
During installation, please ensure that the pins inside the adapter are
aligned with the notches on the valve.
• Snap the adapter completely onto the valve.
• Secure the adapter with the enclosed screw and nut.
50