6 (10)
EN.31.C.5.1907
Assembly instructions | LK Control Unit ETO2
Selected mode Application* Function relay
Start/stop of
BMS
Electric mode
1 zone
Relays 1, 2 and 3 ener-
gized at the same time
Start/stop of
BMS
Electric mode
2 zone
Relay 1 is energized
where zone 1 is active.
Relay 2 is energized
where zone 2 is active.
Maintain flow
temperature
Water based Relay 1 and relay 2 are
energized at the same
time. Relay 3 is unaf-
fected.
* See the heading adjustment below
Connection of supply voltage
Connection of supply voltage is carried out ac-
cording to the circuit diagram.
Remote control
Remote control, forced start
The control unit is equipped with an input to
remotely control/force start the system even if
there is no "real" need. On activated input (closed
contact), the heat is connected and continues un-
til the after heating time reaches value zero. Re-
mote control of forced start is connected between
terminals 35 and 36.
FORCED
CONTROL
HEAT
ETO2
Remote control, forced standby
Forced Standby is used when you don´t want the
unit to start even if there is a need. On activated
input (closed contact), a forced standby is activat-
ed. The function is connected between terminals
33 and 34.
Actuator
LK Control unit ETO2 sends control signals to
impact the 0-10 V actuator (24 V AC 0-10 V, not
LK item). The actuator is connected according to
the table below.
Principle drawing, connection of 0-10 V actuator.
Terminal number
Connect to:
21
COM on actuator
22
Control signal (0-10 V)
23
Strapped to terminal 21
24
24 V AC feed to actuator
25, 26
Transformer 24 V AC
Pump relay
The control unit is equipped with three potential-
free relays (not powered), which if necessary,
can start/stop the system's primary/secondary
pumps or be used to start/stop the external con-
trol equipment. Connection is made according to
the circuit diagram.
Depending on how the device has been set, the
relays have different functions, see table below.
