Siemens RDF301.50 Series Manual page 11

Engineering notes
Mounting and installation
Mounting / Dismounting
Wiring
Siemens
Smart Infrastructure
See "Reference documentation" on page 16 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.
Mount the room thermostat on a conduit box. Do not mount on a wall in niches or
bookshelves, behind curtains, above or near heat sources, or exposed to direct
solar radiation. Mount about 1.5 m above the floor.
· Mount the room thermostat on a clean, dry indoor place without direct airflow
from a heating/cooling device, and not exposed to drips or splash water.
· In case of limited space in the conduit box use the mounting bracket ARG70.3
to increase the headroom by 10 mm.
See the mounting instructions M3171... and M3076.3 enclosed with the
thermostat.
· Comply with local regulations to wire, protection and earth the thermostat.
Warning!
No internal line protection for supply lines to external consumers (Q1, Q2,
Q3, Yxx)
Risk of fire and injury due to short-circuits!
· Adapt the line diameters as per local regulations to the rated value of the
installed overcurrent protection device.
· The AC 230 V mains supply line must have an external 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.
· Cables of SELV inputs X1-M/X2-M: Use cables with 230 V insulation, as the
conduit box carries AC 230 V mains voltage.
· Inputs X1-M or X2-M of different units (e.g. summer/winter switch) may be
connected in parallel with an external switch. The maximum contact current
rating for the external switch should fulfill the overall sensing current of all
connected inputs.
· KNX communication cables (input CE+ / CE-): Use cables with 230 V
insulation, as the conduit box carries AC 230 V mains voltage.
· Disconnect from supply before opening the cover.
· When a KNX bus power supply is connected on the line with communicating
thermostats and Synco controller, the internal KNX power supply of the Synco
controllers must be switched off.
RDF301, RDF301.50..., RDF600KN, RDF600KN/VB, RDF600KN/S
Semi flush-mount communicating room thermostats
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CE1N3171en
2020-02-21