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Siemens Building Technologies Room Unit QAA29.01/ALG and QAA29.11/ALG CE1N1723en

HVAC Products 21.05.2002

Mechanical design

The room unit is designed for surface mounting on a recessed conduit box with the

cables connected from the rear.

The unit comprises a housing and base unit, connected by screw fittings.

The base unit accommodates the screw terminals, which have an integrated terminal

strip.

The housing accommodates a printed circuit board, room temperature sensor element,

setpoint adjuster and fan speed selector (only on QAA29.01/ALG).

Engineering notes

The device receives its power from the connected controller. Only one room unit may

be connected to each controller.

A four-core twisted pair cable is required for the low voltage connection to the control-

ler. Screening is not required.

Four cables are required for the 230 volts connection to the controller (only for

QAA29.01/ALG).

Switch off the 230 V power supply before you open the unit!

The installation (dimension of wires and fuses) must be done according to the local

prescriptions.

Special care must be taken in order to guarantee a proper separation of the 230 V

wires from the wires that conduct low voltage (SELV).

This wall separates the terminals for the

230 V wires from the terminals for the low

voltage (SELV) wires. Take care that the

cover of the unit can be closed properly

after connecting the wires.

Make sure that the wires of the low voltage

and the wires of 230 V are correctly iso-

lated from each other. The low voltage

cable should have an isolation for 230 V in

order to have a proper double isolation

between the 230 V and the low voltage

even when these wires are in contact with

each other.

The room unit is suitable for mounting on a recessed conduit box.

Do not mount in recesses, shelves, behind curtains or doors, or above or near heat

sources.

Avoid direct exposures to direct sunlights 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.

Safety prescriptions

(QAA29.01/ALG)

Mounting

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