Data Sheet for Product

3
Siemens
A6V12005486_en--_c
Smart Infrastructure
2021-05-17
– Electric heater enabled (DI)
– Fault input (DI)
– Monitor input (DI)
– Monitor input (AI)
– Automatic heating/cooling changeover sensor (DI)
– Presence detector (DI)
– Hotel keycard (DI)
● Advanced fan control function, e.g. fan kick, fan start, selectable fan operation (enable,
disable or depending on heating or cooling mode)
● Purge function together with 2-port valve in a 2-pipe changeover system
● Reminder to clean filters
● Floor heating temperature limit
● Reload factory settings for commissioning and control parameters
● User and parameter settings can be retained with power loss and operating mode can be
returned to previous operating mode, Comfort mode or Protection mode (depends on
P27)
● RS 485 Modbus (terminals +, - and REF) for communication with Modbus compatible
devices
● Display on a secondary line: room temperature, outdoor temperature or time of day via
Modbus
● Mounting on both round and square conduit boxes, 60 mm fixing centers
Type summary
Product no.
Stock no.
Operating
voltage
Control outputs
Fan types
Backlit
LCD
Input
Suitable
conduit
box
Color
On/Off
3-pos
DC 0...10 V
3-speed
DC 0...10 V
RDF660MB/MM
S55770-
T433
AC 230 V
✓
✓
-
-
✓
✓
Basic
B1, S1
Square or
round
White
RDF660MB
S55770-
T439
AC 230 V
✓
✓
-
-
✓
✓
Basic
X1, X2
Square or
round
White
Ordering
When ordering, specify both product number/stock number and name:
e.g. RDF660MB/MM / S55770-T433 Modbus room thermostat
Order valve actuators and accessories separately
Accessories
Description
SSN
Data sheet
Changeover mounting kit (50 pcs / package)
ARG86.3
N3009
Plastic mounting spacer for flush-mounted
thermostats to increase the headroom in the
conduit box by 10 mm
ARG70.3
N3009
Note: Order accessories separately.