Room unit with PPS2 interface
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1 1 626 Room unit with PPS2 interface for use with: controllers with a PPS2 interface QAA88.3 Room temperature measurement Key buttons for adjustment of the room temperature setpoint Key buttons for operating mode selection ( / Auto) and manual control of the fan in fan-coil systems (up to 3 speeds) PPS2 interface to controller LCD with room temperature and operating mode display CE2Q1626en Building Technologies HVAC Products
2 Usage The room unit is used in rooms controlled by an individual room control system, to measure the room temperature and for operation of the room controller. The functions of the LCD display are determined by the controller. If manual fan-speed control is enabled, the room unit is suitable for control of a fan-coil system. Ordering When ordering, please specify the quantity, product name and type code. Example: 30 Room units QAA88.3/xxx Note that xxx has to be replaced with the correct 3 letters defining the complete type including special customer versions. The general version is QAA88.3/ALG. Equipment combinations The room unit is suitable for use in conjunction with all controllers which incorporate a PPS2 room unit interface. Mechanical design The room unit is designed for surface mounting or for mounting on a recessed conduit box. The unit comprises a housing and base unit, connected by releasable snap-fittings. The base unit accommodates the screw terminals. The housing accommodates a printed circuit board, room temperature sensor element, setpoint adjuster, key buttons for mode selection and fan speed selection. Both the housing and the base are made of plastic. Operator controls and indication Display of room temperature or offsets or parameters and bars for sequence (heating or cooling) and operating mode and fan speed Key buttons for room temperature setpoint adjustment 3 Symbols for operating mode and fan speed 4 5 Key buttons for mode and fan speed selection Symbols for control sequence (cooling, heating) Q1626Z1 Note The actual functions of the operator controls and indicators are determined by the controller (based on the selected application and associated parameters). 2/6 Building Technologies QAA88.3 Room unit with PPS2 interface CE2Q1626en
3 LCD display In normal operation, the following examples may be displayed (depending on the controller configuration). For details of these functions, refer to the application description of the relevant controller range. Display element (examples) Description Room temperature in C (resolution 0.5 C) Room temperature in F (resolution 1.0 F) Digital display of setpoint adjustment (displayed only while relative adjustment is in progress). Digital display and scale (displayed only while absolute adjustment is in progress) Controlling sequence "cooling" active Controlling sequence "heating" If no bar is shown, the controller is in the neutral zone between heating and cooling. Operating mode is standby Fan speeds are automatically controlled Operating mode is Comfort Fan speeds are automatically controlled Operating mode is Comfort" Fan speed 1 active, manually selected Disposal The room unit includes electrical and electronic components and must not be disposed of as domestic waste. Current local legislation must be observed. Engineering notes The QAA88.3 receives its power from the connected controller via the PPS2 interface (low voltage). Only one room unit may be connected to any one controller. A twisted-pair cable is required for the connection to the controller. Screening is not required. Building Technologies QAA88.3 Room unit with PPS2 interface CE2Q1626en 3/6
4 Mounting Follow the mounting instructions included in the room unit packaging. The room unit is suitable for wall-mounting and for mounting on a recessed conduit box with the cables fed in from the rear. If the cables are mounted on the surface of the wall, then the accessory ARG70.2 shall be used Do not mount in recesses, shelves, behind curtains or doors, or above or near heat sources. Avoid exposure to direct sunlight or draughts. The electrical wiring conduit must be sealed where it joins the room unit, to prevent the occurrence of draughts in the conduit which could affect the sensor. The specified ambient conditions must be complied with. A mounting kit is included with the unit. Installation notes Local installation regulations must be observed. STOP Note! The room unit is not protected against connection to AC 230 V. Terminal layout CP- CP+ PPS2 interface, supply voltage CP Device supply, Data PPS2 (neg.) CP+ Device supply, Data PPS2 (pos.) 4/6 Building Technologies QAA88.3 Room unit with PPS2 interface CE2Q1626en
5 Technical data Supply voltage Maximum voltage (SELV to HD 384) DC 24V The room unit receives its power from the connected controller, via the PPS2 interface (SELV, security extra low voltage according to HD384) Power consumption (from controller) Max VA Function data Temperature sensor Measuring element NTC resistor Measuring range 0 40 C Response time 10 min Accuracy (5 30 C) ±1 K Accuracy (25 C) ± 0.5 K Set-point correction Correction range (determined by controller) max. ± 10 K (default ± 3 K) Display Type LCD Functions displayed Room temperature Setpoint adjustment Operating mode Manually selected fan-speed Control sequence Error code Interfaces Type of interface between controller and room unit PPS2 (point-to-point interface, Version 2) Baud rate 4.8 kbit/s Signal voltage logical 0 < 5 V Signal voltage logical 1 > 7 V Cable connections Connection terminals (screw terminals) Stranded or solid conductors mm 2 Cable type 2-core or 4-core, twisted pairs, unscreened Housing protection standard Protection standard to EN IP 30 Protection class Insulation protection class III Ambient conditions IEC 721 Operation Transport Ambient air conditions Class 3K5 Class 2K3 Temperature C C Humidity < 85 %rh < 95 %rh Mechanical conditions Class 3M2 Class 2M2 Standards Electromagnetic compatibility Interference immunity EN Interference emission EN CE compliance Meets the requirements for CE marking as defined in EMC directive 89/336/EEC Dimensions See Dimensions Color Front housing, key buttons RAL signal white Middle housing, wall bracket RAL light grey Weight Excluding packaging kg Building Technologies QAA88.3 Room unit with PPS2 interface CE2Q1626en 5/6
6 Dimensions All dimensions in mm , , , ,45 6/ Siemens Switzerland Ltd Subject to alteration Building Technologies QAA88.3 Room unit with PPS2 interface CE2Q1626en
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