Page 40
Installing digital offset roomstat RS
Live mains voltage lines and sensors or data bus lines
must always be positioned apart from one another. A
minimum distance of 2 cm between the lines must be
observed here. Line crossings are permissible.
Shielded cables must be used as data bus lines.
Recommended designs: J-Y(St)Y 2 x 2 x 0.6
The cable shielding must be earthed on one side on the
protective conductor connection, e.g. on the strain relief
rails of the heat pump. Multiple earthing of a cable is not
permissible (earth loop).
Electrical connection and bus addressing
The two-wire data bus line is connected to terminals A
and B of the two-pole terminal strip on the baseplate.
The connections are not interchangeable and must be
installed according to the A /B marking in the base. If the
two connection lines are swapped over, the display may
be blank.
Data bus addressing
The connection of one or more offset roomstats to the
central unit is carried out via a two-wire data bus line. As
this connection is always made in parallel
on the same cable, the data transfer must be selected via
the relevant assigned bus addresses.
The bus addresses are assigned in accordance with the
table below:
Control unit
offset roomstat
function
bus
address heating circuit
bus
address
Basic
equipment 10
direct heating circuit
mixer heating circuit 1
mixer heating circuit 2
11
12
13
Setting the bus address in the offset roomstat on initial
commissioning
After completing the electrical installation work and
commissioning the system, the following displays will be
shown on the room station:
1. Segment test (all available segments are shown)
2. Language selection
3. Device identification
4. Bus address (setting according to table above)
5. After assignment, the selected setting will appear on
the display. E.g.: Direct heating circuit, central unit 1
If a bus address is subsequently changed, proceed as
follows:
1 - Disconnect the room station from the data bus line
2 - Plug the room station back in, holding down the rotary
dial until the address setting appears
3 - Set new bus address and confirm
Heat pump
Terminal X4 81
Do not earth here!
