3 576 ACR12.441/ALG Fan-coil controller for wall mounting ACR12.441 Pulse width modulated (PWM) valve outputs for thermal actuators, AC 230 V P or PI control behaviour selectable 3-speed fan control, automatic and manual Manual switching between heating and cooling operation, or automatic with changeover (C/O) sensor QAH11.
Application For controlling the room temperature in individual rooms and zones which are heated and cooled by fan-coils. The controllers are suitable for 2- or 4-pipe applications with manual and automatic fan control. They control: • a 3-speed fan • either two valve actuators for 4-pipe applications • or one valve actuator and an electric heater for 2-pipe applications.
Display The heating and cooling symbols on the display or the appropriate LEDs show in a four pipe system exactly what is done. The heating symbol is active when the fan-coil is heating and the cooling symbol when it is cooling. In neutral zone the symbols are switched off. In a two pipe system these symbols show in general what the status of the fan-coil is (what it can do). This means, the symbols are also shown in the neutral zone.
2-pipe fan-coil with electric heater C/O (changeover) set to cooling Y [%] YHE YK 100 80 3574D10 50 QH XpE WH Xdz WK Xp QK 2-pipe systems, P09 = 1. 2-pipe fan-coil with electric heater C/O (changeover) set to heating Y [%] YH YHE 3574D09 100 QH XpE Xp WH 2-pipe systems, P09 = 1.
If a C/O sensor type QAH11.
Wiring diagrams Circuit with normally closed contacts. (Parameter P03 = 1) Window Contact Nbr. 1 GND DU1 ACR12.441 Nbr. 1 Window Contact Nbr. 2 GND DU1 ACR12.441 Nbr. 2 Circuit with normally open contacts. (Parameter P03 = 0) Window Contact Nbr. 1 Window Contact Nbr. 3 GND GND DU1 ACR12.441 Nbr. 3 DU1 Window Contact Nbr. 2 GND ACR12.441 Nbr. 1 DU1 Window Contact Nbr. 3 GND ACR12.441 Nbr. 2 DU1 ACR12.441 Nbr.
Freeze time In automatic mode a freeze (or hold time) of 1 minute is active. This means that the fan remains at one speed for at least one minute before it is switched to the next. Legend Q1 Q2 Q3 QH QK Fan speed 1 Fan speed 2 Fan speed 3 Heating load Cooling load WH WK Xp Xdz Heating set-point Cooling set-point P-band Neutral zone Valve Actuators Important note Thermal valve actuators for AC 230 V voltage must be used. The control algorithm is optimised for STA21 and STP21 actuators.
• • • • Parameter table Change the value by using the or keys. Press the key to accept a modification or the key to cancel the modification. Incrementing the parameter numbers or the values is accelerated when the + or – key is being kept depressed for more than 2 seconds. To return to normal operation, press the key. Nbr.
Remarks (1) (2) (3) (4) (5) (6) The operating mode can be changed with the button on the controller, by means of a window contact, occupancy detector or otherwise (terminals DU1-GND). Input DU1-GND has a higher priority than the button. In case the controller is in the reduced operating mode, any operation carried out on the front of the controller changes the mode immediately to the normal operating mode. Note that the set-point offset is not active in the reduced operating mode.
4-pipe fan-coil L T PE B2 L M DU1 GND SELV N Q1 Q2 Q3 3 N S1 3573D08 AC 230 V / 50/60 Hz B2 N Y10 N Y1 N1 Y1 M1 Y10 3.5 VA max. 760 VA max. 3.5 VA max. With 4-pipe applications (P09 = 0), a return air sensor QAH11.1 can be connected to terminals B2-M. In this case, the inbuilt sensor is automatically deactivated. Important: 2-pipe fan-coil The c/o or return air sensor input (B2, M) is internally in the controller in contact with the mains supply voltage of AC 230 V.
Project engineering and wiring notes • Wiring, fuses and earthing must be installed in compliance with local regulations. It must be made certain that safety extra low voltage lines (SELV circuits) are clearly separated from AC 230 V mains voltage cables (also refer to Installation Instructions G3576) • The cables to the controller, external sensor, fan, valves and to the electric heater carry AC 230 V and must be appropriately dimensioned.
Safety instructions: Important If an electric heating element is connected to the controller then the installation must comply with the safety regulations EN 60 335-2-73. Safety check If any safety device of the installation activates an interrupt, then the installation must be thoroughly checked before the system is reset and put back into operation. Important The controller may be opened only when isolated from the mains supply.
Technical data Power supply Operating voltage L, N AC 230 V ±10 % Frequency 50 /60 Hz Power consumption 3VA (without field devices) Fuse or circuit breaker in supply lines max. 10 A Over-voltage category III Electrical connections Max. cross-sectional area per terminal 2 wires each with 1.5 mm2 or 1 wire with 2.5 mm2 Outputs Fan control Q1, Q2, Q3 AC 230 V Max. load, cos ϕ > 0.9 3.3 A Type of automatic action according to EN60730 1.
Electromagnetic compatibility Immunity to interference EN 50082-1 Emissions EN 50081-1 Product safety Automatic control devices for use in the home and similar applications Special requirements for energy controllers Housing EN 60730-1 EN60730-2-11 Colour Note 1: RAL 9010 In oder to have IP30 protection the controller must be mounted on a flat surface such that all openings of the back side of the housing are completely covered.
