Mounting and installation
10
DANGER! Danger to life through 
electric shock!
Contacts that are 
open are live.
 f Ensure that the cable 
is deenergized.
Opening the housing
  Open the housing (see fold-out page, Fig. 2).
Plugging in the expansion module (optional)
The expansion module HCS80 expands the 
number of possible temperature zones of the 
underfloor heating controller from 5 to 8.
  Insert the expansion module with the 
adapter connector into the provided slot 
(see fold-out page, Fig. 4 (11)).
Setting the thermal actuator type
  Check which thermal actuator type is used.
  Set the switch in accordance with the following 
table (see fold-out page, Fig.4, (10)):
Switch 
position
Thermal 
actuator type
Property
Normally 
closed
Opens the heating circuit 
when voltage is applied 
to the zone output. The 
thermal actuator only 
requires power during 
heating operation
Normally open
Opens the heating circuit 
when no voltage is applied 
to the zone output.
Only one type of thermal 
actuator can be con-
nected per underoor 
heating controller. 
If normally open and 
normally closed ther-
mal actuators are to 
be operated, you re-
quire two underoor 
heating controllers.
!
 
The thermal actuators 
are protected by a 
ceramic fuse, see 
Section "Navigation 
and function overview" 
on Page 28.
Settings at the underfloor heating controller