HomeMatic HM-CC-VD, Installation And Operating Manual

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Remove the mechanical thermostat head. This is
done by turning the thermostat head in direction (2)
to the end stop. Loosen the threaded connection
(3). If the threaded connection is tight, you may have
to use a pipe wrench. Remove the thermostat head
from the valve (4).
The described installation process is that which is
used most on the market. There are other ways of
fastening thermostat heads however:
• Snap fasteners: Thermostat heads that are
fastened this way can be detached by turning
the fastener/union nut a little bit counter-
clockwise. The thermostat head can then be
removed.
• Compression fitting: The thermostat head is
held by a fastener ring that is compressed with
a screw. Loosen this screw and remove the
thermostat head from the valve.
• Threaded connection with set screw: Loosen
the set screw and remove the thermostat head.