Description Of The Device; Ii.a); Principle Of Operation - Tech Controllers L-7 User Manual

II.

Description of the device

• L-7 external controller is intended for controlling thermostatic valves in diff erent heating
zones. The controller enables signifi cant energy saving due to precise temperature
management in particular rooms. Thanks to advanced software the controller fulfi ls a
wide range of functions:
• - possibility of controlling up to 22 thermostatic actuators via 8 room sensors (C-7p):
• - 3 room sensors may support up to 12 actuators (the maximum of 4 actuators per
one sensor);
• - 5 room sensors may support up to 10 actuators (the maximum of 2 actuators per
one sensor)
• - one 230V output for a pump
• - voltage-free contact (e.g. for controlling the heating device)
• - possibility of connecting ST-507 Internet or WiFi RS to control the system via the
Internet
• - possibility of connecting M-7 wireless control panel with RS communication
• - possibility of connecting ST-61v4 or ST-431n valve module
• - possibility of updating the software via USB

II.a)

Principle of operation

L-7 controller decides if a given zone needs to be heated on the basis of current temperature
value sent by the room sensor (C-7p) as well as the individual operation algorithm of the
zone.
If heating is necessary, the controller activates the additional contact which may
be used e.g. for controlling the heating device.
When the delay time has elapsed (parameter: Main menu/Pump/Delay), the
controller activates CH pump.
The signal from each zone is transmitted to L-7 controller via room sensors.
In each zone the user installs wired valve actuators STT-230/2.
5
L-7
Controller dimensions