11
EXTERNAL SENSOR CONNECTION
No external sensor is connected; after connection to the heating system, the
thermostat measures the room temperature with the internal sensor.
In this case, CONST10 is not set!
Once the external sensor is connected to the connector (page 3), perform
RESET (by simply pushing the RESET button). Verify correct connection of
the sensor:: CONST10 has the CI:d2 message and the sign. How-
ever, do not set the temperature with CONST10!
The temperature is measured with an external sensor. The advantage is that you can
measure the temperature in a different room from that in which the thermostat is located
(regulation of water, floor temperature, technological processes, etc.). With CONST2
(page 8), you can set a different maximum temperature within the range 15 to 99.5 °C.
Note: After disconnecting the external sensor, you must perform RESET again; thus you
re-activate the internal sensor.
You can choose the following functions of the BPT37 thermostat:
- regulation by the temperature measured by the internal sensor of the thermostat
- regulation by the temperature measured by the external sensor of the thermostat
- regulation by the temperature measured by the internal sensor with correction of the maximum
temperature of the thermostat external sensor (floor heating)
1, Function – internal sensor
2, Function – external sensor
BPT37 monitors the maximum floor temperature and simultaneously controls the room temperature. The
thermostat (with PI regulation) regulates the room temperature by the internal sensor (standard ther-
mostat function).
- Connect the external sensor (see page 3), which monitors the maximum
floor temperature.
- Perform RESET, the Ci:d2 message and sign appears with CONST10
(indicating correct connection).
- with CONST10 set the maximum floor temperature at which the
thermostat should switch off. If the room temperature reaches the
maximum permitted value, the heating device is switched off even if the
measured room temperature has not reached the required value. When
the external sensor temperature drops by 0.5 °C, the heating device is
switched on again.
It is necessary to set the maximum external sensor temperature (see CONST10, page 9).
To ascertain the current temperature of the internal and external sensor,
you can use the button; the display consecutively shows Cld:LO 1
(for internal sensor temperature) or Cld:LO 2 (external sensor tempera-
ture).
+/- H
Delivered sensor types:
CT01 C 10kΩ conductor CYXY 2*0.5 mm, length 1.5 m, metal case, for measurements up to 70 °C.
CT01 S 10kΩ silicon conductor, length 1.5 m, metal case, for measurements up to 99 °C.
CT01 P 10kΩ conductor CYXY 2*0.5 mm, length 1.5 m, PVC plastic case, submersible into liquid up to 70 °C.
THE SENSOR CONDUCTORS MUST NOT RUN PARALLEL WITH POWER CONDUCTORS!
3, Function – internal and external sensor = floor heating
