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Siemens QAX50, QAX51 – Flexible room unit CA2N1648en_05

Building Technologies 2015-12-23

Notes on operation

During normal operation and commissioning, the LCD panel also serves to display error

messages:

Display

Description

Room temperature sensor outside range 0 ... 40 °C

Technical data

Power supply

Operating voltage

Max. DC 42 V

(SELV)

Max. DC 42 V class 2 (US)

The

Room unit receives its power via the LONWORKS® bus in accordance with specifica-

tion LPT-10

Power consumption

Max. 0.3 W

Function data

Temperature sensor

Measuring element

NTC resistor

Measuring range

0 ... 40 °C

Response time

≤ 9 min

Measuring accuracy (5 ... 30 °C)

± 0.5 K

Measuring accuracy (25 °C)

± 0.25 K

Setpoint correction

Correction range (defined by application

parameters)

Max.

± 10 K (default ± 3 K)

Display

Type

LCD

Functions displayed

−

Room temperature

−

Setpoint adjustment

−

Operating status

−

Manually selected fan speed

− Control sequence (heating / cooling)

Configurable operator panel

Number of contact points

Max. number of buttons/rocker switches

Functions

−

On/off control of lighting

−

Lighting dimmer control

−

Blinds up/down and adjustment of slat

angle

− OFF button

Interfaces

LONWORKS® bus

Interface type

LONMARK®-compatible

Transceiver

LPT-10

Baud rate

78 kBit/s

Bus topology and bus termination

See Installation guide, CA110334

Cable connection

Connection ter

minals (plug-in screw termi-

nals)

Solid or stranded conductors 2 x 1.0 mm

Single cable lengths