Data Sheet for Product

2
Siemens
A6V12005486_en--_c
Smart Infrastructure
2021-05-17
Use
Applications
Room temperature control (heating or cooling) in individual rooms and zones by means of:
● 2-pipe fan coil units
● 2-pipe fan coil units with electric heater
● 4-pipe fan coil units
The room thermostat controls:
● One ECM fan
● One or two on/off valve actuators
● One on/off valve actuator and one 1-stage electric heater
● One 3-position valve actuator
● One 1-stage compressor with electric heater
Used in systems with:
● Heating or cooling
● Automatic heating/cooling changeover
● Manual heating/cooling changeover
● Heating and cooling (e.g. 4-pipe system)
The room thermostat is delivered with a fixed set of applications.
The relevant application is selected and activated during commissioning using one of the fol-
lowing tools:
● Local DIP switch and HMI
● Modbus commissioning tools
Functions
● Maintain room temperature via built-in temperature sensor or external room tempera-
ture/return air temperature sensor
● Changeover between heating and cooling mode (automatic changeover via local sen-
sor/bus or manual changeover via buttons)
● Select application via DIP switches or commissioning tools
● Select operating mode via operating mode button on the thermostat
● ECM fan control (automatic or manual)
● Display current room temperature or setpoint in °C and/or °F
● Minimum and maximum limitation of room temperature setpoint
● Key lock (automatic, manual or via bus)
● B1 input freely selectable for (RDF660MB/MM only):
– External room temperature sensor or return air temperature sensor
– Automatic heating/cooling changeover sensor
● S1 input freely selectable for (RDF660MB/MM only):
– Window contact
– Presence detector
– Hotel keycard
● 2 multifunctional inputs (X1 and X2), freely selectable for (RDF660MB only):
– External room temperature sensor or return air temperature sensor (AI)
– Automatic heating/cooling changeover sensor (AI)
– Window contact (DI)
– Dew point sensor (DI)