Siemens S55770-T293 - User Manual

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Basic Documentation92 pages

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Summary

Semi flush-mount communicating room thermostats

Mechanical design

Operation and settings

Overview of the thermostat's buttons for mode, fan, and setpoint adjustments.

Display

Explanation of icons and indicators shown on the thermostat's display screen.

Engineering notes

Mounting and installation

Guidelines for physically installing the thermostat on a conduit box.

Wiring

Instructions for safely and correctly wiring the thermostat and connected devices.

Control parameters

Control sequence

Setting system behavior for heating/cooling based on application type.

Calibrate sensor

Procedure for recalibrating the temperature sensor for accurate room temperature display.

Summary

Semi flush-mount communicating room thermostats

Mechanical design

Operation and settings

Overview of the thermostat's buttons for mode, fan, and setpoint adjustments.

Display

Explanation of icons and indicators shown on the thermostat's display screen.

Engineering notes

Mounting and installation

Guidelines for physically installing the thermostat on a conduit box.

Wiring

Instructions for safely and correctly wiring the thermostat and connected devices.

Control parameters

Control sequence

Setting system behavior for heating/cooling based on application type.

Calibrate sensor

Procedure for recalibrating the temperature sensor for accurate room temperature display.

The Siemens RDF301, RDF301.50..., RDF600KN, RDF600KN/VB, and RDF600KN/S are semi flush-mount communicating room thermostats designed for controlling room temperature in individual rooms and zones. These devices are suitable for 2-pipe, 2-pipe with electric heater, and 4-pipe fan coil units, as well as for use with compressors in DX-type equipment.

Function Description:

These thermostats offer comprehensive room temperature control via a built-in temperature sensor or an external room/return air temperature sensor. They support automatic or manual changeover between heating and cooling modes, which can be configured via a local sensor, bus, or manually. Users can select applications using DIP switches or a commissioning tool, and operating modes (Comfort, Economy, Protection) are selectable via a button on the thermostat. A temporary Comfort mode extension is also available.

Fan control includes 1-speed or 3-speed options, with automatic or manual speed control. Advanced fan control functions such as fan kick and fan start are supported, with selectable fan operation (enable, disable, or depending on heating/cooling mode). A purge function is available for 2-pipe changeover systems with 2-port valves. The thermostats also feature a reminder to clean fan filters (adjustable with P62) and floor heating temperature limitation.

The devices display current room temperature or setpoint in °C and/or °F, and allow for minimum and maximum limitation of the room temperature setpoint. Button lock can be activated automatically or manually.

Two multifunctional inputs are freely selectable for various functions, including:

Sensor for automatic heating/cooling changeover
External room temperature or return air temperature sensor
Dew point sensor
Electric heater enable
Fault input
Monitor input for temperature sensor or switch state

For RDF301... models, these inputs can serve as an operating mode switchover contact (keycard, window contact, etc.). For RDF600KN... models, they can be used for window contact or presence detection (standard and hotel presence).

KNX bus communication (S-mode and LTE mode) is a key feature, enabling communication with Synco or other KNX-compatible devices via CE+ and CE- terminals. Through the KNX bus, the thermostats can display outdoor temperature or time of day, and support time scheduling and central control of setpoints. When integrated with a Synco RMx7xx controller, the energy demand signal from the thermostat can be used to optimize energy supply.

The RDF301.50 and RDF600KN/S models include four buttons for controlling KNX actuators via KNX S-mode, supporting functions like switching, dimming, blinds control, and 8-bit scenes. The RDF301.50H model offers dedicated buttons for hotel functions such as "Make Up Room" (MUR) and "Do Not Disturb" (DND) via KNX S-mode.

Important Technical Specifications:

Operating Voltage: AC 230 V, 50/60 Hz.
Power Consumption: Max. 4 VA / 3.0 W (RDF301...), Max. 3.5 VA / 1.2 W (RDF600KN...).
External Protection: Max C 10 A circuit breaker required for supply lines.
Fan Control Outputs (Q1, Q2, Q3-N): AC 230 V, Min. 5 mA, Max. 5(2) A. Fans must not be connected in parallel; one relay per speed for additional fans.
Control Output (Y11-N / Y21-N): AC 230 V, Min. 5 mA, Max. 5(2) A.
Max. Total Load Current (Qx+Yxx): Max. 7A.
Temperature Sensor Input (Multifunctional X1-M/X2-M): QAH11.1 (NTC), range 0...49 °C, max 80 m cable length.
Digital Input (Multifunctional X1-M/X2-M): Selectable NO/NC, SELV DC 0...5 V/max 5 mA. Max 20 thermostats per switch. 4 kV reinforced insulation.
KNX Bus: TP1-64 (electrically isolated), 20 mA (RDF301...), 5 mA (RDF600KN...).
Switching Differential: Adjustable, 2 K (0.5...6K) for heating, 1 K (0.5...6K) for cooling.
Setpoint Range: Comfort (5...40 °C), Economy (OFF, 5...40 °C), Protection (OFF, 5...40 °C).
Built-in Room Temperature Sensor: Measuring range 0...49 °C, accuracy < ± 0.5 K at 25 °C.
Environmental Conditions: Storage (Class 1K3), Transport (Class 2K3), Operation (Class 3K5). No condensation allowed.
Safety Class: II as per EN 60730.
Degree of Protection: IP 30 as per EN 60529.
Connection Terminals: Solid or stranded wires, 1 x 0.4...1.5 mm² minimal wiring cross section.
Housing Front Color: RAL 9003 white (RDF301...), RAL 9004 black (RDF600KN...).
Weight: 0.240 kg / 0.320 kg (RDF301...), 0.150 kg / 0.220 kg (RDF600KN...).

Usage Features:

The thermostats are delivered with a fixed set of applications, which are selected and activated during commissioning using Synco ACS, ETS, or local DIP switches and HMI. They are designed for semi flush-mount installation on a conduit box, approximately 1.5 m above the floor, away from direct airflow, heat sources, or solar radiation.

The devices are composed of two parts: a front panel with electronics, operating elements, and a built-in sensor, and a mounting base with power electronics and screw terminals. The front panel slides into the mounting base and snaps on.

Maintenance Features:

Parameter Settings: User and parameter settings can be retained or restored with power loss. Control parameters can be adjusted via local HMI, Synco ACS, or ETS to ensure optimum system performance.
Calibration: The temperature sensor can be recalibrated if the displayed room temperature does not match the measured temperature (parameter P05).
Factory Settings: The thermostats allow for reloading factory settings for commissioning and control parameters, except for KNX device and zone addresses.
Commissioning: Commissioning tools (Synco ACS or ETS) connect to the KNX bus cable. An external KNX bus power supply is required when connecting directly to a tool.
Fault Indication: The display indicates faults or reminders.
Disposal: The device is considered electrical and electronic equipment and must be disposed of through appropriate channels, complying with local and currently applicable laws and regulations. It should not be disposed of as domestic garbage.