Basic Documentation

Overview
Types
2
A6V12114068_en--_c
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2 Overview
2.1 Types
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
2.2 Functions
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 following tools:
● Local DIP switch and HMI
● Modbus commissioning tools
● Maintain room temperature via built-in temperature sensor or external room
temperature/return air temperature sensor
● Changeover between heating and cooling mode (automatic changeover via
local sensor/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):
Use
Functions