Data Sheet for Product

ManualsBrandsSiemens ManualsBuilding automationHBRAS Report sponsored by Siemens

CE2Q1626en

18-11-2005

Building Technologies

AC Products

626

Room unit with PPS2

interface

QAA88.3

for use with: – controllers with a PPS2 interface

• 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

Summary of content (6 pages)

PAGE 1
Room unit with PPS2 interface for use with: • • • • • CE2Q1626en 18-11-2005 626 QAA88.
PAGE 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.
PAGE 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).
PAGE 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.
PAGE 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. 0.10 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.
PAGE 6
Dimensions All dimensions in mm 4 28 26 30 112,3 11,8 30 28 119 35 28 28 96 23,8 89,45 6/6 ©2005 Siemens Switzerland Ltd Building Technologies HVAC Products QAA88.