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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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1721P

010

1721P

0

20

Summary of Contents for QAA24

Page 1: ...ield 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 ...

Page 2: ...ed from the rear concealed wiring or from below or above surface run wires through knock out openings The units consist of two major sections Casing and baseplate Both snap together but can be detached again The casing accommodates the temperature sensing element and depending on the type of unit various setting and operating elements The ba seplate carries the connecting terminals only with QAA25...

Page 3: ... AZW61 119 tx50 If the QAA25 is used with a shift controller the sensor s range 0 50 C is required for calculating the authority CLASSIC RKN Setpoint adjustments via QAA27 is possible only with controllers RKN8 L RKN88 L RKN W and RKN88T Fitting and installation notes Location On an inner wall of the space to be heated or air conditioned Not in reces ses shelves not behind curtains not opposite or...

Page 4: ...rom serie B on with thin film element QAA25 QAA26 QAA27 Setpoint setting range 5 35 C 5 30 C 3 K Resistance range 95 685 Ω 1000 1195 Ω 1000 1175 Ω Resistance value at setpoint 0 K 1091 Ω 10 C 193 9 Ω 1039 Ω 20 C 390 0 Ω 1118 Ω 25 C 488 3 Ω 1157 Ω 30 C 586 7 Ω 1195 Ω Internal diagram B M LG Ni 1000 1721G01 1721G02 LG Ni 1000 R B M LG Ni 1000 B M R M 1721G03 B1 Room temperature measuring signal M Me...

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