User Manual
Siemens Building Technologies CA2N1613E / 11.1998
Landis & Staefa Division 1/2
1
613
KRT-1L
Remote setpoint unit with
temperature sensor
KRT-1L
Technical data
Adjustment range
Remote temperature setpoint adjuster ± 4 K (in steps of 1K)
Measuring range (T1) – 50 ... 150 °C
Sensor correction (T1) ± 2.5 K (trimming potentiometer)
Holiday switch Off for 1, 2 or 3 days, with indicator
Mode selector switch I On
Aut Auto
o Off
Connection:
T1 sensor 2-wire, interchangeable
Mode selector switch 3-wire
Max. cable length 280 m 2.5 mm
2
Cu
170 m 1.5 mm
2
Cu
110 m 1.0 mm
2
Cu
(max 2 Ω per wire)
Protection class III (2 )
Protection standard IP30 to IEC529, DIN40050
Ambient temperature:
Operation 0 ... 50 °C
Storage – 30 ... 70 °C
Principle of operation
The programmed setpoint can be modified by ± 4 K with the setpoint adjuster.
The holiday switch is used to switch the system off for 1, 2 or 3 days. The Off days
programmed in this way take effect in addition to any normal Off periods, such as
weekends, and apply from the current or next normal switch-off period. To use the
holiday switch, the mode selector switch must be set to Aut.
An LED indicates the selected Off period. This can be cancelled by selecting 1-2-3 in
succession on the holiday switch. The LED will go out, and the Off period will be
cancelled.
The mode selector switch can be used to switch the controller on or off regardless
of the programme entered. When set to Aut, the controller switches on and off in
accordance with the time programme entered.
The sensor is fitted with a silicon sensing element with a positive temperature coef-
ficient, i.e. its resistance increases as the temperature rises.
An integrated trimming potentiometer at the bottom of the housing enables the
temperature sensor (T1) to be corrected by ± 2.5 K. Access is through an aperture
in the housing provided for this purpose.
Application
– Used in INTEGRAL RS controlled heat-
ing and air conditioning systems, for
measurement of the room tempera-
ture and for remote setpoint adjust-
ment.
– Holiday switch to extend the period in
Off mode
– Mode selector switch for change of
operating mode.