Siemens QAA24 User Manual

CM1N1721E
12.07.2003
Siemens Building Technologies
HVAC Products
1
721
QAA24 QAA25…QAA27
Room Temperature
Sensors
QAA24...27
with and without setpoint adjuster
Use
In heating, ventilating and air conditioning plants, especially where a high level of com-
fort is required.
Major field of application:
Acquisition and adjustment of room temperature.
Type summary
Type reference Description
QAA24
Room temperature sensor
QAA25
Room temperature sensor with setpoint adjuster
(setting range 5...35 °C)
QAA26
Room temperature sensor with setpoint adjuster
(setting range 5...30 °C)
QAA27
Room temperature sensor with setpoint adjuster
(setting range ±3 K)
Ordering
When ordering, please give name and type reference, for example:
Room temperature sensor QAA24
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1721P010
1721P020

Siemens QAA24 Specifications

General

Product Type	Temperature Controller
Power Supply	24 V AC/DC
Protection Class	IP20
Control Algorithm	PID
Input Signal	NTC
Output Signal	Relay
Display	LCD
Mounting	Wall
Sensing Element	NTC

Summary

Room Temperature Sensors Overview

Use

Application in heating, ventilating and air conditioning plants for room temperature acquisition and adjustment.

Type Summary

Summary of room temperature sensor types QAA24, QAA25, QAA26, and QAA27 with their descriptions.

Ordering Information

Guidance on how to order room temperature sensors by providing name and type reference.

Equipment Combinations and Design

Equipment Combinations

Lists systems and units compatible with QAA24, QAA25, QAA26, and QAA27 sensors.

Mechanical Design

Details the wall-mounting design, casing, and baseplate construction of the sensors.

Setting and Operating Elements

Describes the front and rear views of setting and operating elements for QAA25, QAA26, QAA27.

Legend for Controls

Explains the meaning of controls like setting knob and pins for setpoint limitation.

Engineering Notes

Provides notes on line lengths, measured value errors, and specific system connections.

Installation and Technical Data

Fitting and Installation Notes

Guidance on optimal sensor placement and installation practices.

Technical Data

Presents general data, connection specifications, protective data, and environmental conditions.

Norms and Standards

Details conformity to EMC directive and other relevant standards.

Sensor Specifications and Dimensions

Materials and Colors

Specifies the materials and colors used for the sensor housing and base.

Sensor Properties

Details sensing element type, time constant, and setpoint setting knob characteristics.

Internal Diagrams

Shows internal wiring diagrams for QAA24, QAA25, QAA26, and QAA27 sensors.

Dimensions

Provides detailed physical dimensions and mounting hole specifications.