RC

Functional description

Room temperature controller and VAV terminal unit, including control components, form a functional unit that allows occupants to control the room temperature individually and at the lowest possible energy consumption. It also allows to control the water valves of hot water or cold water systems.

Room temperature control is a closed loop control. The controller is fitted with a temperature sensor that measures the room temperature. The setpoint can be a constant value or it can be changed by room occupants. The controller compares the actual value with the setpoint value and alters the volume flow rate setpoint value and/or the valve settings accordingly.

The room temperature control is P control or PI control.

Maximum energy efficiency is achieved because of demand-based operating modes that can be activated by the room occupant or at a higher level.

Operating modes

Energy-saving mode

The room temperature is such that devices will not suffer, i.e. the setpoint temperature for heating is very low, and the setpoint temperature for cooling is very high, for example in a room with an open window.

Standby mode

The setpoint temperature for heating is just slightly reduced, and the setpoint temperature for cooling is just slightly increased, e.g. for a room that is currently not used.

Frost mode

If the room temperature falls below 10 °C, the anti-freeze function is activated.

Changeover

Changeover from cooling to heating or from heating to cooling.

Boost

Room ventilation with the maximum volume flow rate (V_max), or maximum heating or cooling.

RC/M1

Application

• Room temperature controller CR24-B1 with one output, for room applications
• Cooling or heating (changeover)
• Analog output 0 – 10 V DC for the control of VAV terminal units with Easy, Compact or Universal controllers

Parts and characteristics

• Attractive unit for wall mounting, signal white (RAL 9003)
• Integral temperature sensor
• Setpoint adjuster
• Operating mode push button
• Status indicator light
• Analog output 0 – 10 V DC for variable volume flow control
• Analog inputs 0 – 10 V DC for external temperature sensor and for setpoint changes by an external unit
• Digital inputs for energy-saving mode, standby operation or changeover
• Micro switch for configuration
• Communication connection for adjustment devices

Commissioning

• Configure the control function using a micro switch
• Functional test

Application

• Room temperature controller CR24-B2 with two outputs, for room applications
• Cooling and heating
• Analog output 0 – 10 V DC for the control of VAV terminal units with Easy, Compact or Universal controllers
• 3-point output for heating

Parts and characteristics

• Attractive unit for wall mounting, signal white (RAL 9003)
• Integral temperature sensor
• Setpoint adjuster
• Operating mode push button
• Status indicator light
• Analog output 0 – 10 V DC for variable volume flow control
• 3-point output for controlling a heating valve
• Analog inputs 0 – 10 V DC for external temperature sensor and for setpoint changes by an external unit
• Digital inputs for energy-saving mode, standby operation or changeover
• Micro switch for configuration
• Communication connection for adjustment devices

Commissioning

• Configure the control function using a micro switch
• Functional test

Application

• Room temperature controller CR24-B3 with three outputs, for room applications
• Cooling and heating
• Analog output 0 – 10 V DC for the control of VAV terminal units with Easy, Compact or Universal controllers
• Analog output 0 – 10 V DC cooling or heating (changeover)
• 3-point output for heating

Parts and characteristics

• Attractive unit for wall mounting, signal white (RAL 9003)
• Integral temperature sensor
• Setpoint adjuster
• Operating mode push button
• Status indicator light
• Analog output 0 – 10 V DC for variable volume flow control
• Analog output 0 – 10 V DC for controlling a water valve
• 3-point output for controlling a heating valve
• Analog inputs 0 – 10 V DC for external temperature sensor and for setpoint changes by an external unit
• Digital inputs for energy-saving mode, standby operation or changeover
• Micro switch for configuration
• Communication connection for adjustment devices

Commissioning

• Configure the control function using a micro switch
• Functional test

Application

• Room temperature controller ETN-24-VAV-227V-P with two outputs, for room applications
• Cooling and heating
• Analog output 0 – 10 V DC for the control of VAV terminal units with Easy, Compact or Universal controllers (cooling operation)
• Analog output 0 – 10 V DC controlling the reheating

Parts and characteristics

• Attractive unit for wall mounting, white
• Setpoint adjuster
• Operating mode push button
• Integral temperature sensor
• Analog input for external temperature sensor
• Display for temperature and status
• Analog output 0 – 10 V DC for variable volume flow control
• Analog output 0 – 10 V DC controlling a heating valve
• Communication connection for adjustment devices

Commissioning

• Configuring the control function
• Functional test