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Siemens RDF302… Flush-mounted room thermostats with RS485 Modbus communications CE1N3079en
Smart Infrastructure 2020-02-21
Engineering notes
The device address of each RDF302… was assigned to “1“ (factory setting). If
necessary, engineer/installer can change the address value through the parameter
P81.
The Baud rate is selectable. Four options, 4800 bps, 9600 bps, 19200 bps and
38400 bps, are available for the RDF302… adapting into the Modbus network
(19200 bps is default).
The parity can be set to none, odd or even (even is default).
Once you made any changes on the baud rate or parity, you must reset the power
before the changes become effective. To reset the power, you can consider by
opening the front panel out of the mounting plate and snap it back.
Mounting and installation
Mount the room thermostat on a recessed square conduit box with 60.3 mm fixing
centers. 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.
Mounting
Mount the room thermostat in a clean, dry indoor place without direct airflow from
a heating / cooling device, and not exposed to dripping or splash water.
In case of limited space in the conduit box, use mounting bracket ARG70.3 to
increase the headroom by 10 mm.
Wiring See Mounting Instructions M3079 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.
Device address
Baud rate
Parity
Note
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