TEMPERATURE SENSOR, HOT WATER
CHARGING
The temperature sensor, hot water charging (BT6) is
placed in the submerged tube on the water heater.
Connect the sensor to terminal block X2:5 and X2:6.
Use a twin core cable with a cable area of at least
0.5 mm².
Hot water charging is activated in menu 5.2 or in the
start guide.
LEK
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TEMPERATURE SENSOR, HOT WATER TOP
A temperature sensor for hot water top (BT7) can be
connected to SMO 20 to show the water temperature
at the top of the tank (if it is possible to install a sensor
at the top of the tank).
Connect the sensor to terminal block X2:4 and X2:6.
Use a twin core cable with a cable area of at least
0.5 mm².
LEK
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TEMPERATURE SENSOR, EXTERNAL FLOW
LINE
Connect the temperature sensor, external supply line
(BT25) (required for additional heat after reversing valve
(QN10), to terminal block X2:8 and X2:10. Use a twin
core cable with a cable area of at least 0.5 mm².
LEK
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TEMPERATURE SENSOR, EXTERNAL SUPPLY
AT ADDITIONAL HEAT BEFORE REVERSING
VALVE (QN10)
Connect the temperature sensor, external supply line
(BT63) (required for additional heat before the reversing
valve for hot water charging (QN10), to terminal block
X2:9 and X2:10. Use a twin core cable with a cable area
of at least 0.5 mm².
LEK
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Caution
For docking that requires connection of other
sensors, see "Possible selection for AUX in-
puts" on page 25.
23Chapter 5 | Electrical connectionsNIBE SMO 20
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