Operating Instructions

Siemens Smart Infrastructure A6V12064527_en--_b A5W00123798A_AB 2021-04-14 1/2

Mounting Instructions

RDF660T

Flush-mounted room thermostat

Installation video Datasheet

Mounting location

Wiring diagrams

Application

2-pipe fan coil,

on/off valve

output with DC

fan

pipe fan coil,

on/off valve, and

electric heater

outputs with DC

fan

4-pipe fan coil,

on/off valve

outputs with DC

fan

Key

N1 RDF660T

M1 ECM fan

V1, V2 Valve

C1, C2 Compressor

S1 Operating mode switch-over

contact (e.g. key card)

B2 External room / return air

temperature sensor

E1 Electrical heater

2-pipe fan coil, 3-

pos valve outputs

with DC fan

No function

DIP

switches

Dimensions (mm)

Mounting

Dismounting

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Mounting Instructions RDF660T Dimensions (mm) Flush-mounted room thermostat Installation video Datasheet Mounting location Mounting Wiring diagrams 4-pipe fan coil, on/off valve outputs with DC fan 2-pipe fan coil, on/off valve, and electric heater outputs with DC fan 2-pipe fan coil, on/off valve output with DC fan Application Dismounting 2-pipe fan coil, 3pos valve outputs with DC fan Key N1 M1 V1, V2 C1, C2 S1 B2 E1 RDF660T ECM fan Valve Compressor Operating mode switch-over contact (e.g.
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Operating Instructions RDF660T Protection mode Condensation in the room * Cooling demand / mode Heating demand / mode Electric heater active Auto Timer mode Comfort mode Economy mode ** Display Measured room temperature, setpoints and parameters Set time schedules To adjust the time schedule, keep pressing button for 3 seconds to enter the timer setting mode. This mode is indicated by displaying Ax (x= auto timer 1...8) and the time flashing. For each timer, proceed as follows: 1.