Katherm HK
Assembly, installation and operating instructions
20
6.2.2 Screed work
The following work needs to have been completed before screeding can begin:
Water has been correctly connected.
The electrical connections have been correctly wired.
The unit is correctly positioned and levelled.
There are no sound bridges to the concrete slab, especially in the area of the height adjustment feet.
Expansion joints have been provided on site to prevent the unit from being compressed by the floor or screed.
All the appropriate cable conduits have been laid.
Appropriate material has been used to seal all the openings and punched openings in the unit. They also need to be ad-
ditionally sealed when using floating screen or other low-viscosity floor coverings!
6.3
Installation
Actuator with ‘First Open’ function
When delivered, the actuator is normally open in a de-energised state, thanks to the First Open function. This enables
heating mode to run even if the electric wiring is not yet completed.
When subsequently commissioned and with the application of power (for longer than 6 minutes), the First Open function
is automatically unlocked so that the actuator becomes fully operational.
0,5 mm
> 0,5 mm
< 0,5 mm
Power on
> 6 min
Power off
Fig. 2: “First Open” function
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