Electrical installation 8
0020196687_03 flexoTHERM exclusive Installation and maintenance instructions
23
–
Rated voltage of external brine pressure switch:
230 V 50 Hz
–
Power range for external brine pressure switch (rms):
1 … 5 mA
8.4.6
Connecting a limit thermostat
In some cases where the underfloor heating has a direct
power supply, a limit thermostat (on-site) is essential.
▶
Pull out the S20 plug for the bypass line at terminal X100
on the control PCB.
▶
Connect the limit thermostat at this terminal.
8.4.7
Connecting an external well pump
2
1
Lb La N
A changeover contact connection X143
(1)
with the assign-
ment Lb, La, N, PE is provided for connecting an external
well pump.
Lb is the opening contact. If the cut-off relay contact to the
well pump is closed, there is no voltage at Lb.
La is the closing contact. If the cut-off relay contact to the
well pump is closed, there is no voltage at La.
The X200
(2)
connection for the optional temperature
sensors available as accessories is labelled RR for return
connections and VV for flow connections.
▶
Connect an external well pump to the X143 connection.
–
Max. switching capacity at plug output: 1 A
▶
Connect the temperature sensors to the VV (suction well)
and RR (injection well) terminals.
Note
No functions are coupled to these temperature
sensors for monitoring the heat source. They
are simply shown on the display.
8.4.8
Connecting the temperature sensor for
an external domestic hot water cylinder
(optional)
1
2
X2
2
▶
Connect the cable on the VR 10 temperature sensor
supplied as an accessory to bush
(1)
on plug
(2)
. Use
a strain relief which does not have a mains voltage line
running through it.
