CTC Union EcoZenith i550 Pro, Installation And Maintenance Manual

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113 CTC EcoZenith i550 Pro
For the installer
16.5 Sensor (Safety Extra-Low Voltage
(SELV))
The sensors that form part of each system solution should be fitted to the
circuit card/terminal block as follows: All sensors are temperature sensors.
Room sensors (B11, B12, B13)
(B13) Optional room sensor for CTC EcoComfort (Cooling).
Room sensors should be installed at head height in open areas of the
property with good air flow and where a representative temperature can be
expected (not close to sources of heat or cold). If you are unsure of where to
place a sensor, hang it by a loose cable and test different positions.
Connection: 3-conductor cable, min. 0.5 mm², between sensor and control
box. The cables are connected as shown in the table above.
On start-up, an alarm is given if the sensor is incorrectly connected. Test the
alarm sensor LED by testing the function in menu
Installer/Service/Function
test.
In the control system you can select whether or not to have the room sensor
operational. If the room sensor is deselected, the heating level is controlled
by the outdoor sensor/primary flow sensor. The alarm lamp on the room
sensor still functions as normal. A room sensor does not, however, need to
be installed if the function is deselected.
Room sensor cable connection:
(B11) Room sensor 1
block no. G17 alarm output
block no. G18 GND
block no. G19 input
(B12) Room sensor 2
Optional room sensor for CTC EcoComfort (cooling), accessory.
block no. G20 alarm output
block no. G21 GND
block no. G22 input
(B13) Room sensor 3, expansion card X4
block no. 19 alarm output
block no. 20 input
block no. 21 GND