Data Sheet for Product

ManualsBrandsSiemens ManualsThermostats (temperature controller with sensor)KC Certificate RCU50.2

Table Of Contents

Accessories
- Dimensions

CE1N3045en

2021-12-08

Smart Infrastructure

045

RCU50

RCU50.1

RCU50.2

Room

Thermostat

RCU50...

 for CAV / VAV heating and cooling systems

 for AHU systems

 for universal heating and cooling systems

 Modulating P-control

 DC 0...10 V output for heating or cooling

 Automatic heating / cooling changeover (RCU50 and RCU50.1)

 Manual heating / cooling changeover (RCU50.2)

 Operating modes:

Normal operation, energy saving and standby (RCU50 and RCU50.1)

 Operating modes: normal operation and OFF (RCU50.2)

 Operating mode selector (RCU50.1)

 Active DC 0...10 V input for setpoint shifting (RCU50 and RCU50.1)

 Operating mode changeover input for remote control (RCU50 and RCU50.1)

 Adjustable minimum limitation for cooling output (RCU50 and RCU50.1)

 Operating voltage AC 24 V

Summary of content (10 pages)

PAGE 1
3 RCU50 RCU50.1 Room Thermostats 045 RCU50.2 RCU50...  for CAV / VAV heating and cooling systems for AHU systems  for universal heating and cooling systems             CE1N3045en 2021-12-08 Modulating P-control DC 0...10 V output for heating or cooling Automatic heating / cooling changeover (RCU50 and RCU50.1) Manual heating / cooling changeover (RCU50.2) Operating modes: Normal operation, energy saving and standby (RCU50 and RCU50.
PAGE 2
Use Control of the room temperature in individual rooms of ventilation or air conditioning plants that are heated or cooled. The RCU50... are especially suited for use with VAV systems in connection with VAV compact controllers type GLB181.1E / 3 and GDB181.1E / 3. The devices can also be used as an AHU temperature controller in connection with valve actuators, as well as for universal heating and cooling applications with DC 0...10 V actuators.
PAGE 3
W Original setpoint W1 Highest setpoint at 10 V input W2 Lowest setpoint at 0 V input (K) Setpoint shift (V) Input voltage . . The setpoint shift is limited within the range of the unit of 8 °C (frost protection) to 30 °C. Automatic changeover (RCU50 and RCU50.1) The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3) is used by the room thermostat to switch from heating to cooling mode, or vice versa.
PAGE 4
Operating mode changeover switch (RCU50 and RCU50.1) A changeover switch can be connected to status input D1–GND. When the switch closes its contact (caused by an open window, for instance), the operating mode will change from normal operation or standby to energy saving mode (provided DIP switch no. 1 is set to ON), or from normal operation or energy saving mode to standby (provided DIP switch no. 1 is set to OFF). The operating action of the switch (N.C. or N.O.) can be selected.
PAGE 5
3041Z01 Operating and setting elements 1 4 2 3 Legend 1 Operating mode selector (RCU50.1) (normal operation, energy saving mode and standby) Switch for manual heating / cooling changeover (RCU50.2) (heating mode, OFF, cooling mode) 2 Room temperature setpoint knob 3 Setting facility for minimum setpoint limitation (in increments of 1 Kelvin) 4 Setting facility for maximum setpoint limitation (in increments of 1 Kelvin) Set of DIP switches of RCU50 and RCU50.1 DIP switch no.
PAGE 6
Notes In systems without automatic changeover, the temperature sensor can be replaced by an external switch for manual changeover. In systems with continuous heating operation, no sensor will be connected to the room thermostat’s input. With continuous cooling operation, the controller input (B2-M) must be bridged. Check the settings of DIP switches no. 1 through no. 5 and of the potentiometer of the RCU50 / RCU50.1 and of DIP switch no. 1 of the RCU50.2 and change them, if required.
PAGE 7
Technical data Power supply Functional data Environmental conditions Operating voltage AC 24 V ± 20 % Frequency 50/60 Hz Power consumption RCU50, RCU50.1 max. 6 VA RCU50.2 max. 0.6 VA No internal fuse External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances Setpoint setting range 8...30 °C Max. control deviation at 25 °C max.  0.7 K P-band in heating mode RCU50 and RCU50.1 (selectable) 1 K or 4 K RCU50.
PAGE 8
Standards and directives Environmental compatibility General EU Conformity (CE) CE1T3040xx *) RCM Conformity CE1T3040en_C1 *) Degree of protection of housing IP30 to EN 60 529 Safety class III to EN 60 730-1 Pollution class normal *) The product environmental declaration CE1E3040 contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal). Connection terminals Use solid wires or prepared stranded wires.
PAGE 9
Connection diagram RCU50 and RCU50.1 in VAV/CAV or AHU N1 Room thermostat S1 External operating mode changeover switch B1 Setpoint shift (outside temperature compensation) B2 Changeover sensor for automatic heating/cooling changeover Y1 VAV/CAV system, DC 0...10V actuator for heating or cooling RCU50.2 in VAV/CAV or AHU N1 Room thermostat Y1 VAV/CAV system, DC 0...10V actuator for heating or cooling 9/10 Siemens Smart Infrastructure RCU50...
PAGE 10
3041M01 Dimensions 114.15 Room thermostat 42,8 96,6 Base plate 4 28 11,8 30 28 104 4 35 28 28 26 30 90 Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58 724 2424 www.siemens.com/buildingtechnologies 3041M02 4 © Siemens Switzerland Ltd, 2003 - 2021 Technical specifications and availability subject to change without notice. 10/10 Siemens Smart Infrastructure RCU50...