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Semi flush-mount room thermostat RDF302 Siemens

Model: 010.003.140
Room thermostat RDF302
Manufacturer: Siemens
Semi flush-mount room thermostats RDF302 with RS485 Modbus communications are designed to control 2-pipe, 2-pipe with electrical heater, and 4-pipe fan coil units. Can be used with compressors in DX type equipment.
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Thermostat characteristics

Product nameRDF302
Ordering codeS55770-T238
Product typeRoom thermostat
Applicationfan coil units
Specific application2-pipe fan coil unit
2-pipe fan coil unit with electrical heater
4-pipe fan coil unit
Supply voltage230VAC
Frequency50 Hz
60 Hz
Max power consumption7VA/3,7W
ColourRAL 9003, white
OutputsFan control Q1, Q2, Q3-N: Rating Max. 5(2) A/230VAC
Control output Y11-N / Y21-N (NO): Rating Max. 5(2) A/230VAC
InputsMultifunctional input X1-M/X2-M
Temperature sensor input:
Type QAH11.1 (NTC)
Temperature range 0...49 °C
Cable length - Max 80m
Digital input:
Operating action - Selectable (NO / NC)
Contact sensing - SELV DC 0...5 V / max 5mA
Parallel connection of several thermostats for one switch - max 20 thermostats per switch
Insulation against mains voltage (SELV) - 4kV, reinforced insulation
Function of inputsExternal temperature sensor, heating/cooling changeover sensor, operating mode switchover contact, dew point monitor contact, enable electrical heater contact, fault contact, monitoring input
X1: P38
X2: P40
Interface typeRS485 Modbus RTU,
Wire (ref.): 16 AWG, 1 pair, shielded line with 1.5 mm 2 and length <1200 m
Bus current - max 50 mA
Switching differential, adjustableHeatig mode (P30) - 2 K (0,5...6 K)
Cooling mode (P31) - 1 K (0,5...6 K)
Setpoint setting and rangeComfort (P08) - 21 °C (5...40 °C)
Economy (P11-P12) - 15 °C / 30 °C ( OFF, 5...40 °C)
Protection (P11-P12) - 8 °C / OFF (OFF, 5...40 °C)
Built-in room temperature sensorMeasuring range 0...49 °C
Accuracy at 25 °C - < ± 0,5 K
Temperature calibration range - ± 3,0 K
Connection terminalsSolid wires or prepared stranded wires 1 x 0.4...1.5 mm² (Note: For sensors on inputs X1 and X2, the cable length is max 80 m)
Weight without / with packaging0,174 kg / 0,261 kg

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