Data Sheet for Product

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Siemens RDF800KN… CB1N3174en
Smart Infrastructure Touch Screen Flush-mount Room Thermostats with KNX Communications 2021-04-22
Engineering notes
See the "Reference documentation", page 15, for information on how to engineer
the KNX bus (topology, bus repeaters, etc.) and how to select and dimension
connecting cables for supply voltage and field devices.
Mounting and installation
Mount the room thermostat on a conduit box. Do not mount on a wall in niches or
between bookshelves, behind curtains, above or near heat sources, or exposed to
direct solar radiation. Mount about 1.5 m above the floor.
Mounting / Dismounting
• Do not apply excessive force on screws! The deformation of the mounting
frame may lead to improper connections and operation of the unit.
• Mount the room thermostat on a clean, dry indoor place without direct airflow
from a heating / cooling device, and not expose to drips or splashes water.
• For RDF800KN, RDF800KN/VB only, in case of limited space in the conduit
box, use the mounting spacer ARG70.3 to increase the headroom by 10mm.
• Before removing the front cover, disconnect the power supply.
Wiring
See the User Manual for the installation instructions enclosed with the
thermostat.
• Comply with local regulations to wire, protection and earth the thermostat.
• The device has no internal fuse for supply lines to fan and actuators. To avoid
risk of fire and injury due to short-circuits, the AC 230 V mains supply line
must have a circuit breaker with a rated current of no more than 10 A.
• Properly size the cables to the thermostat, fan and valve actuators for
AC 230 V mains voltage.
• Use only valve actuators rated for AC 230 V.
• The wiring cross section used for power supply (L, N), fan / relays (Qx) and
230 V outputs (Yx - N) must be adapted to the preceding overload protection
elements (max 10A) under all circumstances. Comply under all
circumstances with local regulations.
• Cables of SELV inputs X1-M / X2-M: Use cables with min 230 V insulation, as
the conduit box carries AC 230 V mains voltage.
• Inputs X1-M or X2-M: Several switches (e.g. window contact) may be
connected in parallel. Consider overall maximum contact sensing current for
switch rating.
• KNX communication cables (input CE+ / CE-): Use cables with min 230 V
insulation, as the conduit box carries AC 230 V mains voltage.
• When a KNX bus power supply is connected on the line with communicating
thermostats and Synco controllers, the internal KNX power supply of the
Synco controllers must be switched off.
• No cables provided with a metal shield.
• Disconnect from supply before opening the cover.